Unexpectedly, there are so many typos in the original text. I am really sorry for the audience. Not many introductions to opengl es 2.0. I believe that I will be the only one who introduces many textures based on Cocos2d-x to learn OpenGL ES 2.0. ~~
Zilongshanren has published a series: Learning OpenGL ES 2.0 based on Cocos2d-x. Get c++ to do cocos2dx can take a look.
The tutorial is written with reference to the iphone tutorial. There are many pits, and the most important pit is in the version. So it is better to get a cocos2dx 3.2. The first two days Huihui said that cocos2dx 3.2 is also very fucking, the return value declared in .h has changed when the source code is implemented. I have to complain about it~
Zilongshanren’s tutorial can only teach you to take a gourd When drawing a scoop, the principles are not involved at all, and some are misleading because of the excessive packaging of cocos2dx.
cocos2dx encapsulates opengl es a little bit Disgusting, if you want to learn opengl es, it is not recommended to learn under cocos2dx.
Stop talking nonsense and start the text.
According to Zilongshanren’s tutorial, a cube texture map was created, but what if you want to paste multiple textures on the same surface? How to achieve it?
This article mentions two methods. The first is to obtain two textures, draw and paste textures separately, which means to install vertices, install indexes, bind textures, and draw pictures. one. Install the vertices, install the texture, and draw the second picture. At this time, GL_TEXTURE0 is used. In the frag file, only one sampler is needed.
The second method is to use two samplers, install vertices, install indexes, bind texture one, bind texture two, and draw pictures. It’s OK.
It’s relatively simple to say, but you really have to do it yourself. For a novice, the process is still a bit depressing.
The source code is listed below, and the meaning of the steps and methods are not introduced here. I believe that the powerful Google and Baidu can play a huge role.
The first is to paste texture on six sides of the cube, and paste the second texture on one of the sides again.
The shader file used:
1 attribute vec4 a_position; // 1 2 attribute vec4 a_color; // 2 3 attribute vec2 TextureCoord; 4 5 varying vec4 DestinationColor; // 3 6 varying vec2 v_texCoord; 7 8 9 void main(void) {// 410 DestinationColor = a_color ; // 511 v_texCoord = TextureCoord; span>12 gl_Position = CC_MVPMatrix * a_position; // 613 }
1 varying vec4 DestinationColor; // 12 varying vec2 v_texCoord;3 4void main( void) {// 25 6 gl_FragColor = DestinationColor * texture2D(CC_Texture0, v_texCoord); // 37< /span> }
The two pictures used
Header file:
#ifndef _CubeTexture_H__< /span>#define _CubeTexture_H__#include "cocos2d.h"using namespace cocos2d;class CubeTexture: public cocos2d: :Layer{public: // there's no'id' in cpp, so we recommend returning the class instance pointer static cocos2d ::Scene* createScene(); // Here's a difference. Method'init' in cocos2d-x returns bool, instead of returning'id' in cocos2d-iphone virtual bool init(); virtual void draw(Renderer *renderer, const Mat4 &transform, uint32_t transformUpdated) override ; //we call our actual opengl commands here void onDraw(); // implement the "static create()" method manually CREATE_FUNC(CubeTexture);private: Mat4 _modelViewMV; CustomCommand _customCommand; GLProgram *mShaderProgram; GLint _colorLocation; GLint _positionLocation; GLint _textureLocation; GLuint _textureUniform; GLuint _textureID ; GLuint _textureID2; GLuint vertexBuffer; GLuint indexBuffer; GLuint _vertexBuffer2; GLuint _indexBuffer2;};#endif // __HELLOWORLD_SCENE_H__
1 #include "CubeTexture.h" 2 using namespace GL; 3 4 cocos2d::Scene* CubeTexture::createScene() 5 { 6 span> auto scene = Scene::create(); 7 auto layer = CubeTexture::create(); 8 scene->addChild(layer); 9 return scene; 10 } 11 12 bool CubeTexture::init() 13 { 14 if (Layer: :init() ) 15 { 16 mShaderProgram = new GLProgram; 17 mShaderProgram->initWithFilenames("myshader.vert ","myshader.frag"); 18 mShaderProgram->link(); 19 mShaderProgram->updateUniforms(); 20 21 _textureID = Director::getInstance()->getTextureCache( )->addImage( "HelloWorld.png" )->getName(); 22 _textureID2 = Director::getInstance( )->getTextureCache()->addImage("item_powerup_fish.png") ->getName(); 23 glGenBuffers( 1, &vertexBuffer );< span style= "color:rgb(0,128,128);line-height:1.5;"> 24 glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer ); 25 26 glGenBuffers( 1, &indexBuffer ); 27 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuffer ); 28 29 return true< span style="line-height:1.5;">; 30 } 31 return false; 32 } 33 34 void CubeTexture::draw( Renderer *renderer, const Mat4 &transform, uint32_t transformUpdated ) 35 { 36 Layer ::draw(renderer, transform, transformUpdated); 3738 _customCommand.init(_globalZOrder); 39 _customCommand.func = CC_CALLBACK_0(CubeTexture::onDraw,this); 40 renderer->addCommand(&_customCommand); 41 } 42 < span style="color:rgb(0,128,128);line-height:1.5;"> 43 void CubeTexture::onDraw() 44 < span style="line-height:1.5;">{ 45 Director::getInstance()->pushMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW); 46 Director::getInstance()->loadIdentityMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW); span> 47 Director::getInstance()->pushMatrix( MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION); 48 Director::getInstance()->loadIdentityMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION); 49 50 Mat4 modelViewMatrix; 51 Mat4::createLookAt(Vec3(0,0< /span>,5), Vec3(0,0,0), Vec3(0, -1,0), &modelViewMatrix); 52 modelViewMatrix.translate(0, 0,0 ); 53 54 static float rotation = 20; 55 modelViewMatrix .rotate(Vec3(0,1,0),CC_DEGREES_TO_RADIANS(rotation)); 56 57 Mat4 projectionMatrix; 58 Mat4::createPerspective(60, 480/320< /span>, 1.0, 42, &projectionMatrix); 59 Director::getInstance()->multiplyMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION, projectionMatrix); 60 Director::getInstance()->multiplyMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW, modelViewMatrix); 61 62 typedef struct { 63 float Position[3]; 64 float Color[4]; 65 float TexCoord[2]; 66 } Vertex; 67 #define TEX_COORD_MAX 1 68 69 Vertex Vertices[] = { 70 //< /span> Front 71 {{1, -1, 0}, {1, 0, 0, 1}, {TEX_COORD_MAX, 0 }}, 72 {{1, 1, 0}, {0, 1 , 0, 1}, {TEX_COORD_MAX, TEX_COORD_MAX}}, 73 {{-1, 1, 0}, {0, 0, 1, 1}, {0< span style="line-height:1.5;">, TEX_COORD_MAX}}, 74 {{-< span style="color:rgb(128,0,128);line-height:1.5;">1, - 1, 0}, {0, 0, 0, 1}, { 0, 0}}, 75 // Back 76 {{1, 1, -2}, {1< /span>, 0, 0, 1}, {TEX_COORD_MAX, 0}}, 77 {{-1, -1, -2}, {0, 1, 0, < span style="color:rgb(128,0,128);line-height:1.5;">1}, {TEX_COORD_MAX, TEX_COORD_MAX}}, span> 78 {{1, -1, -2}, {0, 0, 1 , 1}, {0, TEX_COORD_MAX}}, 79 {{-1 , 1, -2}, {0, 0, 0, 1}, {0, 0}},< span style="color:rgb(0,128,128);line-height:1.5;"> 80 // Left 81 {{-1, -1, 0}, {1 , 0 , 0, 1}, {TEX_COORD_MAX, 0}}, 82 {{-1, 1, 0}, {0< /span>, 1, 0, 1 }, {TEX_COORD_MAX, TEX_COORD_MAX}}, 83< /span> {{-1, 1, -2}, {0, 0, 1, 1}, {0, TEX_COORD_MAX}}, 84 {{-1, -1, -2}, {0, 0, 0, 1}, {0, 0}}, 85 // Right 86 {{1, -1, -2}, {1, 0, 0, 1}, {TEX_COORD_MAX, 0}}, 87 {{1, 1, -2}, {0, 1, 0, 1}, {TEX_COORD_MAX, TEX_COORD_MAX}}, 88 {{1, 1, 0}, {0, 0, 1, 1}, {0, TEX_COORD_MAX}}, 89 {{1, -1, 0}, {0, 0, 0, 1}, {0, 0}}, 90 // Top 91 {{1, 1, 0}, {1, 0, 0, 1}, {TEX_COORD_MAX, 0}}, 92 {{1, 1, -2}, {0, 1, 0, 1}, {TEX_COORD_MAX, TEX_COORD_MAX}}, 93 {{-1, 1, -2}, {0, 0, 1, 1}, {0, TEX_COORD_MAX}}, 94 {{-1, 1, 0}, {0, 0, 0, 1}, {0, 0}}, 95 // Bottom 96 {{1, -1, -2}, {1, 0, 0, 1}, {TEX_COORD_MAX, 0}}, 97 {{1, -1, 0}, {0, 1, 0, 1}, {TEX_COORD_MAX, TEX_COORD_MAX}}, 98 {{-1, -1, 0}, {0, 0, 1, 1}, {0, TEX_COORD_MAX}}, 99 {{-1, -1, -2}, {0, 0, 0, 1}, {0, 0}}100 };101 int vertexCount = sizeof(Vertices) / sizeof(Vertices[0]);102 103 GLu byte Indices[] = {104 // Front105 0, 1, 2,106 2, 3, 0,107 // Back108 4, 5, 6,109 4, 5, 7,110 // Left111 8, 9, 10,112 10, 11, 8,113 // Right114 12, 13, 14,115 14, 15, 12,116 // Top117 16, 17, 18,118 18, 19, 16,119 // Bottom120 20, 21, 22,121 22, 23, 20122 };123 124 // 1) Add to top of file125 const Vertex Vertices2[] = {126 {{0.5, -0.5, 0.01}, {1, 1, 1, 1}, {1, 1}},127 {{0.5, 0.5, 0.01}, {1, 1, 1, 1}, {1, 0}},128 {{-0.5, 0.5, 0.01}, {1, 1, 1, 1}, {0, 0}},129 {{-0.5, -0.5, 0.01}, {1, 1, 1, 1}, {0, 1}},130 };131 132 const GLubyte Indices2[] = {133 1, 0, 2, 3134 };135 136 glBindBuffer(GL_ARRAY_BUFFER, vertexBuffe r);137 glBufferData(GL_ARRAY_BUFFER,sizeof(Vertices),Vertices, GL_STATIC_DRAW);138 139 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuffer);140 glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(Indices),Indices,GL_STATIC_DRAW);141 142 143 _positionLocation = glGetAttribLocation(mShaderProgram->getProgram(), "a_position");144 _colorLocation = glGetAttribLocation(mShaderProgram->getProgram(), "a_color");145 146 _textureLocation = glGetAttribLocation(mShaderProgram->getProgram(), "TextureCoord");147 _textureUniform = glGetUniformLocation(mShaderProgram->getProgram(), "CC_Texture0");148 149 mShaderProgram->use();150 mShaderProgram->setUniformsForBuiltins();151 152 glEnableVertexAttribArray(_positionLocation);153 glEnableVertexAttribArray( _colorLocation);154 glEnableVertexAttribArray(_textureLocation);155 156 glVertexAttribPointer(_positionLocation, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (GLvoid*)offsetof(Vertex, Position));157 158 glVertexAttribPointer(_colorLocation, 4, GL_FLOAT, GL_FALSE, sizeof(Vertex),(GLvoid*)offsetof(Vertex, Color));159 160 glVertexAttribPointer(_textureLocation, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex),161 (GLvoid*)offsetof(Vertex, TexCoord));162 //163 ////set sampler164 GL::bindTexture2DN(0, _textureID); 165 //glActiveTexture( GL_TEXTURE0 );166 //glBindTexture(GL_TEXTURE_2D, _textureID);167 glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);168 glEnable(GL_BLEND);169 glEnable(GL_DEPTH_TEST);170 glDrawElements(GL_TRIANGLES, 36, GL_UNSIGNED_BYTE, 0);171 glUniform1i(_textureUniform, 0); // unnecc in practice172 173 glGenBuffers(1, &_vertexBuffer2);174 glBindBuffer(GL_ARRAY_BUFFER, _vertexBuffer2);175 glBufferData(GL_ARRAY_BUFFER, sizeof(Vertices2), Vertices2, GL_STATIC_DRAW);176 177 glGenBuffers(1, &_indexBuffer2);178 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, _indexBuffer2);179 glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(Indices2), Indices2, GL_STATIC_DRAW);180 181 glBindBuffer(GL_ARRAY_BUFFER, _vertexBuffer2);182 < span style="line-height:1.5;"> glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, _indexBuffer2);183 184 GL::bindTexture2DN(0, _textureID2);185 glUniform1i(_textureUniform, 0); // unnecc in practice186 187 glVertexAttribPointer(_positionLocation, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), 0);188 glVertexAttribPointer(_colorLocation, 4, GL_FLOAT, GL_FALSE, sizeof(Vertex), (GLvoid*) (sizeof(float) * 3));189 glVertexAttribPointer(_textureLocation, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (GLvoid*) (sizeof(float) * 7));190 191 glDrawElements(GL_TRIANGLE_STRIP, sizeof(Indices2)/sizeof(Indices2[0]), GL_UNSIGNED_BYTE, 0);192 193 CC_INCREMENT_GL_DRAWN_BATCHES_AND_VERTICES(1,vertexCount);194 195 CHECK_GL_ERROR_DEBUG();196 glDisable(GL_DEPTH_TEST);197 198 Director::getInstance()->popMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION);199 Director::getInstance()->popMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW);200 }
运行结果：
方法二，所需要的shader文件：
1 attribute vec4 a_position; 2attribute vec2 a_texCoord;3 4 varying vec2 v_texCoord; 5 6 void main(void) {7 gl_Position = CC_MVPMatrix * a_position; 8 v_texCoord = a_texCoord;9 }
1 precision mediump float; 2 varying vec2 v_texCoord; 3 //uniform sampler2D s_lightMap; 4 //uniform sampler2D s_baseMap; 5 6 7 void main(void) { 8 vec4 baseColor; 9 vec4 lightColor;10 //baseColor = texture2D( s_baseMap, v_texCoord);11 //lightColor = texture2D( s_lightMap, v_texCoord );12 baseColor = texture2D( CC_Texture0, v_texCoord);13 lightColor = texture2D( CC_Texture1, v_texCoord ); 14 gl_FragColor = baseColor * ( lightColor + 0.25 ); 15 }
所需要的图
头文件
MultiTexture.h 源文件
1 #include "M ultiTexture.h" 2 3 cocos2d::Scene* MultiTexture::createScene() 4 { 5 auto scene = Scene::create(); 6 auto layer = MultiTexture::create(); 7 scene->addChild(layer); 8 return scene; 9 } 10 11 bool MultiTexture::init() 12 { 13 if ( Layer::init() ) 14 { 15 mShaderProgram = new GLProgram; 16 mShaderProgram->initWithFilen ames("multiTexture.vert","multiTexture.frag"); 17 mShaderProgram->link(); 18 mShaderProgram->updateUniforms(); 19 20 _baseMapTexId = Director::getInstance()->getTextureCache()->addImage( "HelloWorld.png" )->getName(); 21 _lightMapTexId = Director::getInstance()->getTextureCache()->addImage("crate.jpg")->getName(); 22 glGenVertexArrays(1, &VAO); 23 glBindVertexArray(VAO); 24 25 glGenBuffers( 1, &vertexBuffer ); 26 glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer ); 27 28 glGenBuffers( 1, &indexBuffer ); 29 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuffer ); 30 31 return true; 32 } 33 return false; 34 } 35 36 void MultiTexture::draw( Renderer *renderer, const Mat4 &transform, uint32_t transformUpdated ) 37 { 38 Lay er::draw(renderer, transform, transformUpdated); 39 40 _customCommand.init(_globalZOrder); 41 _customCommand.func = CC_CALLBACK_0(MultiTexture::onDraw,this); 42 renderer->addCommand(&_customCommand); 43 } 44 45 void MultiTexture::onDraw() 46 { 47 Director::getInstance()->pushMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW); 48 Director::getInstance()->loadIdentityMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW); 49 Director::getInstance()->pushMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION); 50 Director::getInstance()->loadIdentityMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION); 51 52 typedef struct { 53 float Position[3]; 54 float TexCoord[2]; 55 } Vertex; 56 #define TEX_COORD_MAX 1 57 58 Vertex Vertices[] = { 59 60 {{-0.5, 0.5, 0}, {0, 0}}, 61 {{-0.5, -0.5, 0}, {0, TEX_COORD_MAX}}, 62 {{0.5, -0.5, 0}, { TEX_COORD_MAX,TEX_COORD_MAX}}, 63 {{0.5, 0.5, 0}, {TEX_COORD_MAX, 0}}, 64 65 }; 66 int vertexCount = sizeof(Vertices) / sizeof(Vertices[0]); 67 68 GLubyte Indices[] = { 69 0, 1, 2, 70 2, 3, 0, 71 }; 72 73 glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer); 74 glBufferData(GL_ARRAY_BUFFER,sizeof(Vertices),Vertices, GL_STATIC_DRAW); 75 76 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuffer); 77 glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(Indices),Indices,GL_STATIC_DRAW); 78 79 _positionLoc = glGetAttribLocation(mShaderProgram->getProgram(), "a_position"); 80 _texCoordLoc = glGetAttribLocation(mShaderProgram->getProgram(), "a_texCoord"); 81 //_baseMapLoc = glGetUniformLocation(mShaderProgram->getProgram(), "s_baseMap"); 82 //_lightMapLoc = glGetUniformLocation(mShaderProgram->getProgram(), "s_lightMap"); 83 _baseMapLoc = glGetUniformLocation(mShaderProgram->getProgram(), "CC_Texture0"); 84 _lightMapLoc = glGetUniformLocation(mShaderProgram->getProgram(), "CC_Texture1"); 85 86 glEnableVertexAttribArray(_positionLoc); 87 glEnableVertexAttribArray(_texCoordLoc); 88 89 glVertexAttribPointer(_positionLoc, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (GLvoid*)offsetof(Vertex, Position)); 90 glVertexAttribPointer(_texCoordLoc, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), 91 (GLvoid*)offsetof(Vertex, TexCoord)); 92 93 mShaderProgram->use(); 94 mShaderProgram->setUniformsForBuiltins(); 95 96 glEnable(GL_DEPTH_TEST); 97 glBindVertexArray(VAO); 98 99 GL::bindTexture2DN(0, _lightMapTexId);100 glUniform1i(_lightMapLoc, 0 ); // unnecc in practice101 102 GL::bindTexture2DN(1, _baseMapTexId);103 glUniform1i(_baseMapLoc, 1); // unnecc in practice104 105 glDrawElements(GL_TRIANGLES,6, GL_UNSIGNED_BYTE, 0 );106 107 glBindVertexArray(0);108 CC_INCREMENT_GL_DRAWN_BATCHES_AND_VERTICES(1,6);109 110 CHECK_GL_ERROR_DEBUG();111 glDisable(GL_DEPTH_TEST);112 113 Director::getInstance()->popMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION);114 Director::getInstance()->popMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW);115 }
运行效果：
第二种方法中，
cpp内的：
//_baseMapLoc = glGetUniformLocation(mShaderProgram->getProgram(), “s_baseMap”);
//_lightMapLoc = glGetUniformLocation(mShaderProgram->getProgram(), “s_lightMap”);
_baseMapLoc = glGetUniformLocation(mShaderProgram->getProgram(), “CC_Texture0”);
_lightMapLoc = glGetUniformLocation(mShaderProgram->getProgram(), “CC_Texture1”);
和shader内的
//baseColor = texture2D( s_baseMap, v_texCoord);
//lightColor = texture2D( s_lightMap, v_texCoord );
baseColor = texture2D( CC_Texture0, v_texCoord);
lightColor = texture2D( CC_Texture1, v_texCoord );
将注释解开，把下面两行注掉。同样可以。这说明了，cocos2dx在进行编译shader的时候内置了多个uniform值。大家可以看一下，其中就包括CC_Texture0系列。
其实用起来不算方便了，而不注意的人，可能会声明和内置变量相同的名字，此时，咳咳咳咳咳~ shader编译的时候就会出错了。不知道为啥cocos2dx要多次一举。
还有一点：
////set sampler
GL::bindTexture2DN(0, _textureID);
//glActiveTexture( GL_TEXTURE0 );
//glBindTexture(GL_TEXTURE_2D, _textureID);
我使用了GL::bindTexture2DN 方法，而并没有使用opengl es原装的 glActiveTexture 和glBindTexture这两个方法。其实GL::bindTexture2DN 内部就调用了后面的两个方法，那为何不直接用后面的两个方法呢？
原因是，直接用opengl es的方法，会出错！ ! !尼玛 这才是坑点。跟踪后发现，cocos2dx给GL相关的东西添加了一个StateCache的东西，当activeTexture时，需要更改cache内的东西。直接调用glActiveTexture的方法，就略去了往cache内塞东西的步骤，这样就出错了。
猜测是cocos2dx进行渲染的时候，调用了cache内的什么东西。尼玛，你还能封装的再恶心一点么？
所以说，不喜欢cocos2dx这种处理问题的方法的，可以完全抛开cocos2dx了。
(原文：https://www.cnblogs.com/slysky/p/3981210.html）
没想到原文出了那么多错别字，实在对不起观众了。介绍opengl es 2.0的不多。相信介绍基于Cocos2d-x学习OpenGL ES 2.0之多纹理的，我是独此一家吧。 ~~
子龙山人出了一个系列：基于Cocos2d-x学习OpenGL ES 2.0。弄c++来搞cocos2dx的可以看看。
教程是参考iphone的教程来写的，坑点也有不少，最主要的坑点还是在版本。所以还是弄个cocos2dx 3.2比较好。前两天辉辉说cocos2dx 3.2也很操蛋，.h里声明的返回值在源码实现的时候返回类型竟然变了。不得不吐槽一下~
子龙山人的教程只能教你照葫芦画瓢，什么原理的东西是压根就没涉及，有的还因为cocos2dx的封装过度会产生一些误导。
cocos2dx对opengl es封装的有点让人恶心，如果想学习opengl es是不建议在cocos2dx下进行学习的。
废话少说吧，开始正文。
根据子龙山人的教程，弄出了立方体纹理贴图，但是假如想在同一个面上贴多个纹理呢？该怎么实现？
本文提到两个方法，第一就是获取两个纹理，分别画图贴纹理，意思就是装顶点，装索引，绑定纹理，画图一。装顶点，装纹理，画图二。此时用到的都是GL_TEXTURE0，在frag文件中，只需要一个采样器就ok。
第二中方法就是用两个sampler，装顶点，装索引，绑定纹理一，绑定纹理二，画图。就OK了。
说起来比较简单，真要自己动手做，对于一个新手来说，过程还是有点小郁闷的。
下面就上源码了，对于步骤和方法的含义，此处不作介绍。相信强大的google和百度可以发挥巨大的作用。
第一种是立方体六个面贴上纹理，其中一个面再次贴上第二个纹理。
所用到的shader文件：
1 attribute vec4 a_position; // 1 2 attribute vec4 a_color; // 2 3 attribute vec2 TextureCoord; 4 5 varying vec4 DestinationColor; // 3 6 varying vec2 v_texCoord; 7 8 9 void main(void) { // 410 DestinationColor = a_color; // 511 v_texCoord = TextureCoord;12 gl_Position = CC_MVPMatrix * a_position; // 613 }
1 varying vec4 DestinationColor; // 12 varying vec2 v_texCoord;3 4 void main(void) { // 25 6 gl_FragColor = DestinationColor * texture2D(CC_Texture0, v_texCoord) ; // 37 }
所用到的两张图
头文件：
#ifndef _CubeTexture_H__#define _CubeTexture_H__#include < /span>"cocos2d.h"using namespace cocos2d;class CubeTexture : public cocos2d::Layer{public: // there's no 'id' in cpp, so we recommend returning the class instance pointer static cocos2d::Scene* createScene();// Here's a difference. Method 'init' in cocos2d-x returns bool, instead of returning 'id' in cocos2d-iphone virtual bool init(); virtual void draw(Renderer *renderer, const Mat4 &transform, uint32_t transformUpdated) override; //we call our actual opengl commands here void onDraw(); // implement the "static create()" method manually CREATE_FUNC(CubeTexture);private: Mat4 _modelViewMV; CustomCommand _customCommand; GLProgram *mShaderProgram; GLint _colorLocation; GLint _positionLocation; GLint _textureLocation; GLuint _textureUniform; GLuint _textureID; GLuint _textureID2; GLuint vertexBuffer; GLuint indexBuffer; GLuint _vertexBuffer2; GLuint _indexBuffer2;};#endif // __HELLOWORLD_SCENE_H__
1 #include "CubeTex ture.h" 2 using namespace GL; 3 4 cocos2d::Scene* CubeTexture::createScene() 5 { 6 auto scene = Scene::create(); 7 auto layer = CubeTexture::create(); 8 scene->addChild (layer); 9 return scene; 10 } 11 12 bool CubeTexture::init() 13 { 14 if ( Layer::init() ) 15 { 16 mS haderProgram = new GLProgram; 17 mShaderProgram->initWithFilenames("myshader.vert","myshader.frag"); 18 mShaderProgram->link(); 19 mShaderProgram->updateUniforms(); 20 21 _textureID = Director::getInstance()->getTextureCache()->addImage( "HelloWorld.png" )->getName(); 22 _textureID2 = Director::getInstance()->getTextureCache()->addImage("item_powerup_fish.png")->getName(); 23 glGenBuffers( 1, &vertexBuffer ); 24 glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer ); 25 26 glGenBuffers( 1, &indexBuffer ); 27 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuffer ); 28 29 return true; 30 } 31 return false; 32 } 33 34 void CubeTexture::draw( Renderer *renderer, const Mat4 &transform, uint32_t transformUpdated ) 35 { 36 Layer::draw(renderer, transform, transformUpdated); 37 38 _customCommand.init(_globalZOrder); 39 _customCommand.func = CC_CALLBACK_0(CubeTexture::onDraw,this); 40 renderer->addCommand(&_customCommand); 41 } 42 43 void CubeTexture::onDraw() 44 { 45 Director::getInstance()-> pushMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW); 46 Director::getInstance()->loadIdentityMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW); 47 Director::getInstance()->pushMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION); 48 Director::getInstance()->loadIdentityMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION); 49 50 Mat4 modelViewMatrix; 51 Mat4::createLookAt(Vec3(0,0,5), Vec3(0,0,0), Vec3(0,-1,0), &modelViewMatrix); 52 modelViewMatrix.translate(0, 0,0 ); 53 54< /span> static float rotation = 20; 55 modelViewMatrix.rotate(Vec3(0,1,0),CC_DEGREES_TO_RADIANS(rotation)); 56 57 Mat4 projectionMatrix; 58 Mat4::createPerspective(60, 480/320, 1.0, 42, &projectionMatrix); 59 Director::getInstance()->multiplyMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION, projectionMatrix); 60 Director::getInstance()->multiplyMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW, modelViewMatrix); 61 62 typedef struct { 63 float Position[3]; 64 float Color[4]; 65 float TexCoord[2]; 66 } Vertex; 67 #define TEX_COORD_MAX 1 68 69 Vertex Vertices[] = { 70 // Front 71 {{1, -1, 0}, {1, 0, 0, 1}, {TEX_COORD_MAX, 0}}, 72 {{1, 1, 0}, {0, 1, 0, 1}, {TEX_COORD_MAX, TEX_COORD_MAX}}, 73 {{-1, 1, 0}, {0, 0, 1, 1}, {0, TEX_COORD_MAX}}, 74 {{-1, -1, 0}, {0, 0, 0, 1}, {0, 0}}, 75 // Back 76 {{1, 1, -2}, {1, 0, 0, 1}, {TEX_COORD_MAX, 0}}, 77 {{-1, -1, -2}, {0, 1, 0, 1}, {TEX_COORD_MAX, TEX_COORD_MAX}}, 78 {{1, -1, -2}, {0, 0, 1, 1}, {0, TEX_COORD_MAX}}, 79 {{-1, 1, -2}, {0, 0, 0, 1}, {0, 0}}, 80 // Left 81 {{-1, -1, 0}, {1, 0, 0, 1}, {TEX_COORD_MAX, 0}}, 82 {{-1, 1, 0}, {0, 1, 0, 1}, {TEX_COORD_MAX, TEX_COORD_MAX}}, 83 {{-1, 1, -2}, {0, 0, 1, 1}, {0, TEX_COORD_MAX}}, 84 {{-1, -1, -2}, {0, 0, 0, 1}, {0, 0}}, 85 // Right 86 {{1, -1, -2}, {1, 0, 0, 1}, {TEX_COORD_MAX, 0}}, 87 {{1, 1, -2}, {0, 1, 0, 1}, {TEX_COORD_MAX, TEX_COORD_MAX}}, 88 {{1, 1, 0}, {0, 0, 1, 1}, {0, TEX_COORD_MAX}}, 89 {{1, -1, 0}, {0, 0, 0, 1}, {0, 0}}, 90 // Top 91 {{1, 1, 0}, {1, 0, 0, 1}, {TEX_COORD_MAX, 0}}, 92 {{1, 1, -2}, {0, 1, 0, 1}, {TEX_COORD_MAX, TEX_COORD_MAX}}, 93 {{-1, 1, -2}, {0, 0, 1, 1}, {0, TEX_COORD_MAX}}, 94 {{-1, 1, 0}, {0, 0, 0, 1}, {0, 0}}, 95 // Bottom 96 {{1, -1 , -2}, {1, 0, 0, 1}, {TEX_COORD_MAX, 0}}, 97 {{1, -1, 0}, {0, 1, 0, 1}, {TEX_COORD_MAX, TEX_COORD _MAX}}, 98 {{-1, -1, 0}, {0, 0, 1, 1}, {0, TEX_COORD_MAX}}, 99 {{-1, -1, -2}, {0, 0, 0, 1}, {0, 0}}100 };101 int vertexCount = sizeof(Vertices) / sizeof(Vertices[0]);102 103 GLubyte Indices[] = {104 // Front105 0, 1, 2,106 2, 3, 0,107 // Back108 4, 5, 6,109 4, 5, 7,110 // Left111 8, 9, 10,112 10, 11, 8,113 // Right114 12, 13, 14,115 14, 15, 12,116 // Top117 16, 17, 18,118 18, 19, 16,119 // Bottom120 20, 21, 22,121 22, 23, 20122 };123 124 // 1) Add to top of file125 const Vertex Vertices2[] = {126 {{0.5, -0.5, 0.01}, {1, 1, 1, 1}, {1, 1}},127 {{0.5, 0.5, 0.01}, {1, 1, 1, 1}, {1, 0}},128 {{-0.5, 0.5, 0.01}, {1, 1, 1, 1}, {0, 0}},129 {{-0.5, -0.5, 0.01}, {1, 1, 1, 1}, {0, 1}},130 };131 132 const GLubyte Indices2[] = {133 1, 0, 2, 3134 };135 136 glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer);137 glBufferData(GL_ARRAY_BUFFER,sizeof(Vertices),Vertices, GL_STATIC_DRAW);138 139 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuffer);140 glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(Indices),Indices,GL_STATIC_DRAW);141 142 143 _positionLocation = glGetAttribLocation(mShaderProgram->getProgram(), "a_position");144 _colorLocation = glGetAttribLocation(mShaderProgram->getProgram(), "a_color");145 146 _textureLocation = glGetAttribLocation(mShaderProgram->getProgram(), "TextureCoord");147 _textureUnifor m = glGetUniformLocation(mShaderProgram->getProgram(), "CC_Texture0");148 149 mShaderProgram->use();150 mShaderProgram->setUniformsForBuiltins();151 152 glEnableVertexAttribArray(_positionLocation);153 glEnableVertexAttribArray(_colorLocation);154 glEnableVertexAttribArray(_textureLocation);155 156 glVertexAttribPointer(_positionLocation, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (GLvoid*)offsetof(Vertex, Position));157 158 glVertexAttribPointer(_colorLocation, 4, GL_FLOAT, GL_FALSE, sizeof(Vertex),(GLvoid*)offsetof(Vertex, Color));159 160 glVertexAttribPointer(_textureLocation, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex),161 (GLvoid*)offsetof(Vertex, TexCoord));162 //163 ////set sampler164 GL::bindTexture2DN(0, _textureID);165 //glActiveTexture( GL_TEXTURE0 );166 //glBindTexture(GL_TEXTURE_2D, _textureID);167 glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);168 glEnable(GL_BLEND);169 glEnable(GL_DEPTH_TEST);170 glDrawElements(GL_TRIANGLES, 36, GL_UNSIGNED_BYTE, 0);171 glUniform1i(_textureUniform, 0); // unnecc in practice172 173 glGenBuffers(1, &_vertexBuffer2);174 glBindBuffer(GL_ARRAY_BUFFER, _vertexBuffer2);175 glBufferData(GL_ARRAY_BUFFER, sizeof(Vertices2), Vertices2, GL_STATIC_ DRAW);176 177 glGenBuffers(1, &_indexBuffer2);178 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, _indexBuffer2);179 glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(Indices2), Indices2, GL_STATIC_DRAW);180 181 glBindBuffer(GL_ARRAY_BUFFER, _vertexBuffer2);182 glBindBuffer(G L_ELEMENT_ARRAY_BUFFER, _indexBuffer2);183 184 GL::bindTexture2DN(0, _textureID2);185 glUniform1i(_textureUniform, 0); // unnecc in practice186 187 glVertexAttribPointer(_positionLocation, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), 0);188 glVertexAttribPointer(_colorLocation, 4, GL_FLOAT, GL_FALSE, sizeof(Vertex), (GLvoid*) (sizeof(float) * 3));189 glVertexAttribPointer(_textureLocation, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (GLvoid*) (sizeof(float) * 7));190 191 glDrawElements(GL_TRIANGLE_STRIP, sizeof(Indices2)/sizeof(Indices2[0]), GL_UNSIGNED_BYTE, 0);192 193 CC_INCREMENT_GL_DRAWN_BATCHES_AND_VERTICES(1,vertexCount);194 195 CHECK_GL_ERROR_DEBUG();196 glDisable(GL_DEPTH_TEST);197 198 Director::getInstance()->popMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION);199 Director::getInstance()->popMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW);200 }
运行结果：
方法二，所需要的shader文件：
1 attribute vec4 a_position; 2 attribute vec2 a_texCoord;3 4 varying vec2 v_texCoord; 5 6 void main(void) {7 gl_Position = CC_MVPMatrix * a_position; 8 v_texCoord = a_texCoord;9 }
1 precision mediump float; 2 varying vec2 v_texCoord; 3 //uniform sampler2D s_lightMap; 4 //uniform sampler2D s_baseMap; 5 6 7 void main(void) { 8 vec4 baseColor; 9 vec4 lightColor;10 //baseColor = texture2D( s_baseMap, v_texCoord);11 //lightColor = texture2D( s_lightMap, v_texCoord );12 baseColor = texture2D( CC_Texture0, v_texCoord);13 lightColor = texture2D( CC_Texture1, v_texCoord ); 14 gl_FragColor = baseColor * ( lightColor + 0.25 ); 15 }
所需要的图
头文件
MultiTexture.h 源文件
1 #include "MultiTexture.h" 2 3 cocos2d::Scene* MultiTexture::createScene() 4 { 5 auto scene = Scene::create(); 6 auto layer = MultiTexture::create(); 7 scene->addChild(layer); 8 return scene; 9 } 10 11 bool MultiTexture::init() 12 { 13 if ( Layer::init() ) 14 { 15 mShaderProgram = new GLProgram; 16 mShaderProgram->initWithFilenames("multiTexture.vert","multiTexture.frag"); 17 mShaderProgram->link(); 18 mShaderProgram->updateUniforms(); 19 20 _baseMapTexId = Director::getInstance()->getTextureCache()->addImage( "HelloWorld.png" )->< span style="line-height:1.5;">getName(); 21 _lightMapTexId = Director::getInstance()->getTextureCache()->addImage("crate.jpg")->getName(); 22 glGenVertexArrays(1, &VAO); 23 glBindVertexArray(VAO); 24 25 glGenBuffers( 1, &vertexBuff er ); 26 glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer ); 27 28 glGenBuffers( 1, &indexBuffer ); 29 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuffer ); 30 31 return true; 32 } 33 return false; 34 } 35 36 void MultiTexture::draw( Renderer *renderer, const Mat4 &transform, uint32_t transformUpdated ) 37 { 38 Layer::draw(renderer, transform, transformUpdated); 39 40 _customCommand.init(_globalZOrder); 41 _customCommand.func = CC_CALLBACK_0(MultiTexture::onDraw,this); 42 renderer->addCommand(&_customCommand); 43 } 44 45 void MultiTexture::onDraw() 46 { 47 Director::getInstance()->pushMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW); 48 Director::getInstance()->loadIdentityMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW); 49 Director::getInstance()->pushMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION); 50 Director::getInstance()->loadIdentityMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION); 51 52 typedef struct { 53 float Position[3]; 54 float TexCoord[2]; 55 } Vertex; 56 #define TEX_COORD_MAX 1 57 58 Vertex Vertices[] = { 59 60 {{-0.5, 0.5, 0}, {0, 0}}, 61 {{-0.5, -0.5, 0}, {0, TEX_COORD_MAX}}, 62 {{0.5, -0.5, 0}, { TEX_COORD_MAX,TEX_COORD_MAX}}, 63 {{0.5, 0.5, 0}, {TEX_COORD_MAX, 0}}, 64 65 }; 66 int vertexCount = sizeof(Vertices) / sizeof(Vertices[0]); 67 68 GLubyte Indices[] = { 69 0, 1, 2, 70 2, 3, 0, 71 }; 72 73 glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer); 74 glBufferData(GL_ARRAY_BUFFER,sizeof(Vertices),Vertices, GL_STATIC_DRAW); 75 76 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuffer); 77 glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(Indices),Indices,GL_STATIC_DRAW); 78 79 _positionLoc = gl GetAttribLocation(mShaderProgram->getProgram(), "a_position"); 80 _texCoordLoc = glGetAttribLocation(mShaderProgram->getProgram(), "a_texCoord"); 81 //_baseMapLoc = glGetUniformLocation(mShaderProgram->getProgram(), "s_baseMap"); 82 //_lightMapLoc = glGetUniformLocation(mShaderProgram->getProgram(), "s_lightMap"); 83 _baseMapLoc = glGetUniformLocation(mShaderProgram->getProgram(), "CC_Texture0"); 84 _lightMapLoc = glGetUniformLocation(mShaderProgram->getProgram(), "CC_Texture1"); 85 86 glEnableVertexAttribArray(_positionLoc); 87 glEnableVertexAttribArray(_texCoordLoc); 88 89 glVertexAttribPointer(_positionLoc, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (GLvoid*)offsetof(Vertex, Position)); 90 glVertexAttribPointer(_texCoordLoc, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), 91 (GLvoid*)offsetof(Vertex, TexCoord)); 92 93 mShaderProgram->use(); 94 mShaderProgram->setUniformsForBuiltins(); 95 96 glEnable(GL_DEPTH_TEST); 97 glBindVertexArray(VAO); 98 99 GL::bindTexture2DN(0, _lightMapTexId);100 glUniform1i(_lightMapLoc, 0 ); // unnecc in practice101 102 GL::bindTexture2DN(1, _baseMapTexId);103 glUniform1i(_baseMapLoc, 1); // unnecc in practice104 105 glDrawElements(GL_TRIANGLES,6, GL_UNSIGNED_BYTE, 0 );106 107 glBindVertexArray(0);108 CC_INCREMENT_GL_DRAWN_BATCHES_AND_VERTICES(1,6);109 110 CHECK_GL_ERROR_DEBUG();111 glDisable(GL_DEPTH_TEST);112 113 Director::getInstance()->popMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION);114 Director::getInstance()->popMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW);115 }
运行效果：
第二种方法中，
cpp内的：
//_baseMapLoc = glGetUniformLocation(mShaderProgram->getProgram(), “s_baseMap”);
//_lightMapLoc = glGetUniformLocation(mShaderProgram->getProgram(), “s_lightMap”);
_baseMapLoc = glGetUniformLocation(mShaderProgram->getProgram(), “CC_Texture0”);
_lightMapLoc = glGetUniformLocation(mShaderProgram->getProgram(), “CC_Texture1”);
和shader内的
//baseColor = texture2D( s_baseMap, v_texCoord);
//lightColor = texture2D( s_lightMap, v_texCoord );
baseColor = texture2D( CC_Texture0, v_texCoord);
lightColor = texture2D( CC_Texture1, v_texCoord );
将注释解开，把下面两行注掉。同样可以。这说明了，cocos2dx在进行编译shader的时候内置了多个uniform值。大家可以看一下，其中就包括CC_Texture0系列。
其实用起来不算方便了，而不注意的人，可能会声明和内置变量相同的名字，此时，咳咳咳咳咳~ shader编译的时候就会出错了。不知道为啥cocos2dx要多次一举。
还有一点：
////set sampler
GL::bindTexture2DN(0, _textureID);
//glActiveTexture( GL_TEXTURE0 );
//glBindTexture(GL_TEXTURE_2D, _textureID);
我使用了GL::bindTexture2DN 方法，而并没有使用opengl es原装的 glActiveTexture 和glBindTexture这两个方法。其实GL::bindTexture2DN 内部就调用了后面的两个方法，那为何不直接用后面的两个方法呢？
原因是，直接用opengl es的方法，会出错！ ! !尼玛 这才是坑点。跟踪后发现，cocos2dx给GL相关的东西添加了一个StateCache的东西，当activeTexture时，需要更改cache内的东西。直接调用glActiveTexture的方法，就略去了往cache内塞东西的步骤，这样就出错了。
猜测是cocos2dx进行渲染的时候，调用了cache内的什么东西。尼玛，你还能封装的再恶心一点么？
所以说，不喜欢cocos2dx这种处理问题的方法的，可以完全抛开cocos2dx了。
(原文：https://www.cnblogs.com/slysky/p/3981210.html）
子龙山人出了一个系列：基于Cocos2d-x学习OpenGL ES 2.0。弄c++来搞cocos2dx的可以看看。
教程是参考iphone的教程来写的，坑点也有不少，最主要的坑点还是在版本。所以还是弄个cocos2dx 3.2比较好。前两天辉辉说cocos2dx 3.2也很操蛋，.h里声明的返回值在源码实现的时候返回类型竟然变了。不得不吐槽一下~
子龙山人的教程只能教你照葫芦画瓢，什么原理的东西是压根就没涉及，有的还因为cocos2dx的封装过度会产生一些误导。
cocos2dx对opengl es封装的有点让人恶心，如果想学习opengl es是不建议在cocos2dx下进行学习的。
废话少说吧，开始正文。
根据子龙山人的教程，弄出了立方体纹理贴图，但是假如想在同一个面上贴多个纹理呢？该怎么实现？
本文提到两个方法，第一就是获取两个纹理，分别画图贴纹理，意思就是装顶点，装索引，绑定纹理，画图一。装顶点，装纹理，画图二。此时用到的都是GL_TEXTURE0，在frag文件中，只需要一个采样器就ok。
第二中方法就是用两个sampler，装顶点，装索引，绑定纹理一，绑定纹理二，画图。就OK了。
说起来比较简单，真要自己动手做，对于一个新手来说，过程还是有点小郁闷的。
下面就上源码了，对于步骤和方法的含义，此处不作介绍。相信强大的google和百度可以发挥巨大的作用。
第一种是立方体六个面贴上纹理，其中一个面再次贴上第二个纹理。
所用到的shader文件：
1 attribute vec4 a_position; // 1 2 attribute vec4 a_color; // 2 3 attribute vec2 TextureCoord; 4 5 varying vec4 DestinationColor; // 3 6 varying vec2 v_texCoord; 7 8 9 void main(void) { // 410 DestinationColor = a_color; // 511 v_texCoord = TextureCoord;12 gl_Position = CC_MVPMatrix * a_position; // 613 }
1 varying vec4 DestinationColor; // 12 varying vec2 v_texCoord;3 4 void main(void) { // 25 6 gl_FragColor = DestinationColor * texture2D(CC_Texture0, v_texCoord) ; // 37 }
所用到的两张图
头文件：
#ifndef _CubeTexture_H__#define _CubeTexture_H__#include "cocos2d.h"using namespace cocos2d;class CubeTexture : public cocos2d::Layer{public: // there's no 'id' in cpp, so we recommend returning the class instance pointer static cocos2d::Scene* createScene(); // Here's a difference. Method 'init' in cocos2d-x returns bool, instead of returning 'id' in cocos2d-iphone virtual bool init(); virtual void draw(Renderer *renderer, const Mat4 &transform, uint32_t transformUpdated) override; //we call our actual opengl commands here void onDraw(); // implement the "static create()" method manually CREATE_FUNC(CubeTexture);private: Mat4 _modelViewMV; CustomCommand _customCommand; GLProgram *mShaderProgram; GLint _colorLocation; GLint _positionLocation; GLint _textureLocation; GLuint _textureUniform; GLuint _textureID; GLuint _textureID2; GLuint vertexBuffer; GLuint indexBuffer; GLuint _vertexBuffer2; GLuint _indexBuffer2;};#endif // __HELLOWORLD_SCENE_H__
1 #include "CubeTexture.h" 2 using namespace GL; 3 4 cocos2d::Scene* CubeTexture::createScene() 5 { 6 auto scene = Scene::create(); 7 auto layer = CubeTexture::create(); 8 scene->addChild(layer); 9 return scene; 10 } 11 12 bool CubeTexture::init() 13 { 14 if ( Layer::init() ) 15 { 16 mShaderProgram = new GLProgram; 17 mShaderProgram->initWithFilenames("myshader.vert","myshader.frag"); 18 mShaderProgram->link(); 19 mShaderProgram->updateUniforms(); 20 21 _textureID = Director::getInstance()->getTextureCache()->addImage( "HelloWorld.png" )->getName(); 22 _textureID2 = Director::getInstance()->getTextureCache()->addImage("item_powerup_fish.png")->getName(); 23 glGenBuffers( 1, &vertexBuffer ); 24 glBind Buffer(GL_ARRAY_BUFFER, vertexBuffer ); 25 26 glGenBuffers( 1, &indexBuffer ); 27 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuffer ); 28 29 return true; 30 } 31 return false; 32 } 33 34 void CubeTexture::draw( Renderer *renderer, const Mat4 &transform, uint32_t transformUpdated ) 35 { 36 Layer::draw(renderer, transform, transformUpdated); 37 38 _customCommand.init(_globalZOrder); 39 _customCommand.func = CC_CALLBACK_0(CubeTexture::onDraw,this); 40 renderer->addCommand(&_customCommand); 41 } 42 43 void CubeTexture::onDraw() 44 { 45 Director::getInstance()->pushMatrix(MATRIX _STACK_TYPE::MATRIX_STACK_MODELVIEW); 46 Director::getInstance()->loadIdentityMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW); 47 Director::getInstance()->pushMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION); 48 Director::getInstance()->loadIdentityMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION); 49 50 Mat4 modelViewMatrix; 51 Mat4::createLookAt(Vec3(0,0,5), Vec3(0,0,0), Vec3(0,-1,0), &modelViewMatrix); 52 modelViewMatrix.translate(0, 0,0 ); 53 54 static float rotation = 20; 55 modelViewMatrix.rotate(Vec3(0,1,0),CC_DEGREES_TO_RADIANS(rotation)); 56 57 Mat4 projectionMatrix; 58 Mat4::createPerspective(60, 480/320, 1.0, 42, &projectionMatrix); 59 Director::getInstance()->multiplyMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION, projectionMatrix); 60 Director::getInstance()->multiplyMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW, modelViewMatrix); 61 62 typedef struct { 63 float Positio n[3]; 64 float Color[4]; 65 float TexCoord[2]; 66 } Vertex; 67 #define TEX_COORD_MAX 1 68 69 Vertex Vertices[] = { 70 // Front 71 {{1, -1, 0}, {1, 0, 0, 1}, {TEX_COORD_MAX, 0}}, 72 {{1, 1, 0}, {0, 1, 0, 1}, {TEX_COORD_MAX, TEX_COORD_MAX}}, 73 {{-1, 1, 0}, {0, 0, 1, 1}, {0< /span>, TEX_COORD_MAX}}, 74 {{-1, -1, 0}, {0, 0, 0, 1}, {0, 0}}, 75 // Back 76 {{1, 1, -2}, {1, 0, 0, 1}, {TEX_COORD_MAX, 0}}, 77 {{-1, -1, -2}, {0, 1, 0< /span>, 1}, {TEX_COORD_MAX, TEX_COORD_MAX}}, 78 {{1, -1, -2}, {0, 0, 1, 1}, {0, TEX_COORD_MAX}}, 79 {{-1, 1, -2}, {0, 0, 0, 1}, {0, 0}}, 80 // Left 81 {{-1, -1, 0}, {1, 0, 0, 1}, {TEX_COORD_MAX, 0}}, 82 {{-1, 1, 0}, {0, 1, 0, 1}, {TEX_COORD_MAX, TEX_COORD_MAX}}, 83 {{-1, 1, -2}, {0, 0, 1, 1}, {0, TEX_COORD_MAX}}, 84 {{-1, -1, -2}, {0, 0, 0, 1}, {0, 0}}, 85 // Right 86 {{1, -1, -2}, {1, 0, 0, 1}, {TEX_COORD_MAX, 0}}, 87 {{1, 1, -2}, {0, 1, 0, 1}, {TEX_COORD_MAX, TEX_COORD_MAX}}, 88 {{1, 1, 0}, {0, 0, 1, 1}, {0, TEX_COORD_MAX}}, 89 {{1, -1, 0}, {0, 0, 0, 1}, {0, 0}}, 90 // Top 91 {{1, 1, 0}, {1, 0, 0, 1}, {TEX_COORD_MAX, 0}}, 92 {{1, 1, -2}, {0, 1, 0, 1}, {TEX_COORD_MAX, TEX_COORD_MAX}}, 93 {{-1, 1, -2}, {0, 0, 1, 1}, {0, TEX_COORD_MAX}}, 94 {{-1, 1, 0}, {0, 0, 0, 1}, {0, 0}}, 95 // Bottom 96 {{1, -1, -2}, {1, 0, 0, 1}, {TEX_COORD_MAX, 0}}, 97 {{1, -1, 0}, {0, 1, 0, 1}, {TEX_COORD_MAX, TEX_COORD_MAX}}, 98 {{-1, -1, 0}, {0, 0, 1, 1}, {0, TEX_COORD_MAX}}, 99 {{-1, -1, -2}, {0, 0, 0, 1}, {0, 0}}100 };101 int vertexCount = sizeof(Vertices) / sizeof(Vertices[0]);102 103 GLubyte Indices[] = {104 // Front105 0, 1, 2,106 2, 3, 0,107 // Back108 4, 5, 6,109 4, 5, 7,110 // Left111 8, 9, 10 ,112 10, 11, 8,113 // Right114 12, 13, 14,115 14, 15, 12,116 // Top117 16, 17, 18,118 18, 19, 16,119 //< /span> Bottom120 20, 21, 22,121 22, 23, 20122 };123 124 // 1) Add to top of file 125 const Vertex Vertices2[] = {126 {{0.5, -0.5, 0.01}, {1, 1, 1, 1}, {1, 1}},127 {{0.5 , 0.5, 0.01}, {1, 1, 1, 1}, {1, 0}},128 {{-0.5, 0.5, 0.01}, {1, 1, 1< /span>, 1}, {0, 0}},129 {{-0.5, -0.5, 0.01}, {1, 1, 1, 1}, {0, 1}},130 };131 132 const GLubyte Indices2[] = {133 1, 0, 2, 3134 };135 136 glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer);137 glBufferData(GL_ARR AY_BUFFER,sizeof(Vertices),Vertices, GL_STATIC_DRAW);138 139 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuffer);140 glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(Indices),Indices,GL_STATIC_DRAW);141 142 143 _positionLocation = glGetAttribLocation(mShaderProgram->getProgram(), "a_position");144 _colorLocation = glGetAttribLocation(mShaderProgram->getProgram(), "a_color");145 146 _textureLocation = glGetAttribLocation(mShaderProgram->getProgram(), "TextureCoord");147 _textureUniform = glGetUniformLocation(mShaderProgram->getProg ram(), "CC_Texture0");148 149 mShaderProgram->use();150 mShaderProgram->setUniformsForBuiltins();151 152 glEnableVertexAttribArray(_positionLocation);153 glEnableVertexAttribArray(_colorLocation);154 glEnableVertexAttribArray(_textureLocation);155 156 glVertexAttribPointer(_positionLocation, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (GLvoid*)offsetof(Vertex, Position));157 158 glVertexAttribPointer(_colorLocation, 4, GL_FLOAT, GL_FALSE, sizeof(Vertex),(GLvoid*)offsetof(Vertex, Color));159 160 glVertexAttribPointer(_textureLocation, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex),161 (GLvoid*)offsetof(Vertex, TexCoord));162 //163 ////set sampler164 GL::bindTexture2DN(0, _textureID);165 //glActiveTexture( GL_TEXTURE0 );166 //glBindTexture(GL_TEXTURE_2D, _textureID);167 glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);168 glEnable(GL_BLEND);169 glEnable(GL_DEPTH_TEST);170 glDrawElements(GL_TRIANGLES, 36, GL_UNSIGNED_BYTE, 0);171 glUniform1i(_textureUniform, 0); // unnecc in practice172 173 glGenBuffers(1, &_vertexBuffer2);174 glBindBuffer(GL_ARRAY_BUFFER, _vertexBuffer2);175 glBufferData(GL_ARRAY_BUFFER, sizeof(Vertices2), Vertices2, GL_STATIC_DRAW);176 177 glGenBuffers(1, &_indexBuffer2);178 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, _indexBuffer2);179 glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(Indices2), Indices2, GL_STATIC_DRAW);180 181 glBindBuffer(GL_ARRAY_BUFFER, _vertexBuffer2);182 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, _indexBuffer2);183184 GL::bindTexture2DN(0, _textureID2);185 glUniform1i(_textureUniform, 0); // unnecc in practice186 187 glVertexAttribPointer(_positionLocation, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), 0);188 glVertexAttribPointer(_colorLocation, 4, GL_FLOAT, GL_FALSE, sizeof(Vertex), (GLvoid*) (sizeof(float) * 3));189 glVertexAttribPointer(_textureLocation, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (GLvoid*) (sizeof(float) * 7));190 191 glDrawElements(GL_TRIANGLE_STRIP, sizeof(Indices2)/sizeof(Indices2[0]), GL_UNSIGNED_BYTE, 0);192 193 CC_INCREMENT_GL_DRAWN_BATCHES_AND_VERTICES(1,vertexCount);194 195 CHECK_GL_ERROR_DEBUG();196 glDisable(GL_DEPTH_TEST);197 198 Director::getInstance()->popMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION);199 Director::getInstance()->popMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW);200 }
运行结果：
方法二，所需要的shader文件：
1 attribute vec4 a_position; 2 attribute vec2 a_texCoord;3 4 varying vec2 v_texCoord; 5 6 void main(void) {7 gl_Position = CC_MVPMatrix * a_position; 8 v_texCoord = a_texCoord;9 }
1 precision mediump float; 2 varying vec2 v_texCoord; 3 //uniform sampler2D s_lightMap; 4 //uniform sampler2D s_baseMap; 5 6 7 void main(void) { 8 vec4 baseColor; 9 vec4 lightColor;10 //baseColor = texture2D( s_baseMap, v_texCoord);11 //lightColor = texture2D( s_lightMap, v_texCoord );12 baseColor = texture2D( CC_Texture0, v_texCoord);13 lightColor = texture2D( CC_Texture1, v_texCoord ); 14 gl_FragColor = baseColor * ( lightColor + 0.25 ); 15 }
所需要的图
头文件
MultiTexture.h 源文件
1 #include "MultiTexture.h" 2 3 cocos2d::Scene* MultiTexture::createScene() 4 { 5 auto scene = Scene::create(); 6 auto layer = MultiTexture::create(); 7 scene->addChild(layer); 8 return scene; 9 } 10 11 bool MultiTexture::init() 12 { 13 if ( Layer::init() ) 14 { 15 mShaderProgram = new GLProgram; 16 mShaderProgram->initWithFilenames("multiTexture.vert","multiTexture.frag"); 17 mShaderProgram->link(); 18 mShaderProgram->updateUniforms(); 19 20 _baseMapTexId = Director::getInstance()->getTextureCache()->addImage( "HelloWorld.png" )->getName(); 21 _lightMapTexId = Director::getInstance()->getTextureCache()->addImage("crate.jpg")->getName(); 22 glGenVertexArrays(1, &VAO); 23 glBindVertexArray(VAO); 24 25 glGenBuffers( 1, &vertexBuffer ); 26 glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer ); 27 28 glGenBuffers( 1, &indexBuffer ); 29 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuffer ); 30 31 return true; 32 } 33 return false; 34 } 35 36 void MultiTexture::draw( Renderer *renderer, const Mat4 &transform, uint32_t transformUpdated ) 37 { 38 Layer::draw(renderer, transform, transformUpdated); 39 40 _customCommand.init(_globalZOrder); 41 _customCommand.func = CC_CALLBACK_0(MultiTexture::onDraw,this); 42 renderer->addCommand(&_customCommand); 43 } 44 45 void MultiTexture::onDraw() 46 { 47 Director::getInstance()->pushMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW); 48 Director::getInstance()->loadIdentityMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW); 49 Director::getInstance()->pushMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION); 50 Director::getInstance()->loadIdentityMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION); 51 52 typedef struct { 53 float Position[3]; 54 float TexCoord[2]; 55 } Vertex; 56 #define TEX_COORD_MAX 1 57 58 Vertex Vertices[] = { 59 60 {{-0.5, 0.5, 0}, {0, 0}}, 61 {{-0.5, -0.5, 0}, {0, TEX_COORD_MAX}}, 62 {{0.5, -0.5, 0}, { TEX_COORD_MA X,TEX_COORD_MAX}}, 63 {{0.5, 0.5, 0}, {TEX_COORD_MAX, 0}}, 64 65 }; 66 int vertexCount = sizeof(Vertices) / sizeof(Vertices[0]); 67 68 GLubyte Indices[] = { 69 0, 1, 2, 70 2, 3, 0, 71 }; 72 73 glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer); 74 glBufferData(GL_ARRAY_BUFFER,sizeof(Vertices),Vertices, GL_STATIC_DRAW); 75 76 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuffer); 77 glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(Indices),Indices,GL_STATIC_DRAW); 78 79 _positionLoc = glGetAttribLocation(mShaderProgram->getProgram(), "a_position"); 80 _texCoordLoc = glGetAttribLocation(mShaderProgram->getProgram(), "a_texCoord"); 81 //_baseMapLoc = glGetUniformLocation(mShaderProgram->getProgram(), "s_baseMap"); 82 //_lightMapLoc = glGetUniformLocati on(mShaderProgram->getProgram(), "s_lightMap"); 83 _baseMapLoc = glGetUniformLocation(mShaderProgram->getProgram(), "CC_Texture0"); 84 _lightMapLoc = glGetUniformLocation(mShaderProgram->getProgram(), "CC_Texture1"); 85 86 glEnableVertexAttribArray(_positionLoc); 87 glEnableVertexAttribArray(_texCoordLoc); 88 89 glVertexAttribPointer(_positionLoc, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (GLvoid*)offsetof(Vertex, Position)); 90 glVertexAttribPointer(_texCoordLoc, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), 91 (GLvoid*)offsetof(Vertex, TexCoord)); 92 93 mShaderProgram->use(); 94 mShaderProgram->setUniformsForBuiltins(); 95 96 glEnable(GL_DEPTH_TEST); 97 glBindVertexArray(VAO); 98 99 GL::bindTexture2DN(0, _lightMapTexId);100 glUniform1i(_lightMapLoc, 0 ); // unnecc in practice101 102 GL::bindTexture2DN(1, _baseMapTexId);103 glUniform1i(_baseMapLoc, 1); // unnecc in practice104 105 glDrawElements(GL_TRIANGLES,6, GL_UNSIGNED_BYTE, 0 );106 107 glBindVertexArray(0);108 CC_INCREMENT_GL_DRAWN_BATCHES_AND_VERTICES(1,6);109 110 CHECK_GL_ERROR_DEBUG();111 glDisable(GL_DEPTH_TEST);112 113 Director::getInstance()->popMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION);114 Director::getInstance()->popMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW);115 }
运行效果：
第二种方法中，
cpp内的：
//_baseMapLoc = glGetUniformLocation(mShader Program->getProgram(), “s_baseMap”);
//_lightMapLoc = glGetUniformLocation(mShaderProgram->getProgram(), “s_lightMap”);
_baseMapLoc = glGetUniformLocation(mShaderProgram->getProgram(), “CC_Texture0”);
_lightMapLoc = glGetUniformLocation(mShaderProgram->getProgram(), “CC_Texture1”);
和shader内的
//baseColor = texture2D( s_baseMap, v_texCoord);
//lightColor = texture2D( s_lightMap, v_texCoord );
baseColor = texture2D( CC_Texture0, v_texCoord);
lightColor = texture2D( CC_Texture1, v_texCoord );
将注释解开，把下面两行注掉。同样可以。这说明了，cocos2dx在进行编译shader的时候内置了多个uniform值。大家可以看一下，其中就包括CC_Texture0系列。
其实用起来不算方便了，而不注意的人，可能会声明和内置变量相同的名字，此时，咳咳咳咳咳~ shader编译的时候就会出错了。不知道为啥cocos2dx要多次一举。
还有一点：
////set sampler
GL::bindTexture2DN(0, _textureID);
//glActiveTexture( GL_TEXTURE0 );
//glBindTexture(GL_TEXTURE_2D, _textureID);
我使用了GL::bindTexture2DN 方法，而并没有使用opengl es原装的 glActiveTexture 和glBindTexture这两个方法。其实GL::bindTexture2DN 内部就调用了后面的两个方法，那为何不直接用后面的两个方法呢？
原因是，直接用opengl es的方法，会出错！ ! !尼玛 这才是坑点。跟踪后发现，cocos2dx给GL相关的东西添加了一个StateCache的东西，当activeTexture时，需要更改cache内的东西。直接调用glActiveTexture的方法，就略去了往cache内塞东西的步骤，这样就出错了。
猜测是cocos2dx进行渲染的时候，调用了cache内的什么东西。尼玛，你还能封装的再恶心一点么？
所以说，不喜欢cocos2dx这种处理问题的方法的，可以完全抛开cocos2dx了。
(原文：https://www.cnblogs.com/slysky/p/3981210.html）
1 attribute vec4 a_position; // 1 2 attribute vec4 a_color; // 2 3 attribute vec2 TextureCoord; 4 5 varying vec4 DestinationColor; // 3 6 varying vec2 v_texCoord; 7 8 9 void main(void) { // 410 DestinationColor = a_color; // 511 v_texCoord = TextureCoord;12 gl_Position = CC_MVPMatrix * a_position; // 613 }
1 attribute vec4 a_position; // 1 2 attribute vec4 a_color; // 2 3 attribute vec2 TextureCoord; 4 5 varying vec4 DestinationColor; // 3 6 varying vec2 v_texCoord; 7 8 9 void main(void) { // 410 DestinationColor = a_color; // 511 v_texCoord = TextureCoord;12 gl_Position = CC_MVPMatrix * a_position; // 613 }
1 varying vec4 DestinationColor; // 12 varying vec2 v_texCoord;3 4 void main(void) { // 25 6 gl_FragColor = DestinationColor * texture2D(CC_Texture0, v_texCoord) ; // 37 }
1 varying vec4 DestinationColor; // 12 varying vec2 v_texCoord;3 4 void main(void) { // 25 6 gl_FragColor = DestinationColor * texture2D(CC_Texture0, v_texCoord) ; // 37 }
#ifndef _CubeTexture_H__#define _CubeTexture_H__#include "cocos2d.h"using namespace cocos2d;class CubeTexture : public cocos2d::Layer{public: // there's no 'id' in cpp, so we recommend returning the class instance pointer static cocos2d::Scene* create Scene(); // Here's a difference. Method 'init' in cocos2d-x returns bool, instead of returning 'id' in cocos2d-iphone virtual bool init(); virtual void draw(Renderer *renderer, const Mat4 &transform, uint32_t transformUpdated) override; //we call our actual opengl commands here v oid onDraw(); // implement the "static create()" method manually CREATE_FUNC(CubeTexture);private: Mat4 _modelViewMV; CustomCommand _customCommand; GLProgram *mShaderProgram; GLint _colorLocation; GLint _positionLocation; GLint _textureLocation; GLuint _textureUniform; GLuint _textureID; GLuint _textureID2; GLuint vertexBuffer; GLuint indexBuffer; GLuint _vertexBuffer2; GLuint _indexBuffer2;};#endif // __HELLOWORLD_SCENE_H__
#ifndef _CubeTexture_H__#define _CubeTexture_H__#include "cocos2d.h"using namespace cocos2d;class CubeTexture : public cocos2d::Layer{public: // there's no 'id' in cpp, so we recommend returning the class instance pointer static cocos2d::Scene* createScene(); // Here's a difference. Method 'init' in cocos2d-x returns bool, instead of returning 'id' in cocos2d-iphone virtual bool init(); virtual void draw(Renderer *renderer, const Mat4 &transform, uint32_t transformUpdated) override; //we call our actual opengl commands here void onDraw(); // implement the "static create()" method manually CREATE_FUNC(CubeTexture);private: Mat4 _modelViewMV; CustomCommand _customCommand; GLProgram *mShaderProgram; GLint _colorLocation; GLint _positionLocation; GLint _textureLocation; GLuint _textureUniform; GLuint _textureID; GLuint _textureID2; GLuint vertexBuffer; GLuint indexBuffer; GLuint _vertexBuffer2; GLuint _indexBuffer2;};#endif // __HELLOWORLD_SCENE_H__
1 #include "CubeTexture.h" 2 using namespace GL; 3 4 cocos2d::Scene* CubeTexture::createScene() 5 { 6 auto scene = Scene::create(); 7 auto layer = CubeTexture::create(); 8 scene->addChild(layer); 9 return scene;10} 11 12 bool CubeTexture::init() 13 { 14 if ( Layer::init() ) 15 { 16 mShaderProgram = new GLProgram; 17 mShaderProgram->initWithFilenames("myshader.vert","myshader.frag"); 18 mShaderProgram->link(); 19 mShaderProgram->updateUniforms(); 20 21 _textureID = Director::getInstance()->getTextureCache()->addImage( "HelloWorld.png" )->getName(); 22 _textureID2 = Director::getInstance()->getTextureCache()->addImage("item_powerup_fish.png")->getName(); 23 glGenBuffers( 1, &vertexBuffer ); 24 glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer ); 25 26 glGenBuffers( 1, &indexBuffer ); 27 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuffer ); 28 29 return true; 30 } 31 return false; 32 } 33 34 void CubeTexture::draw( Renderer *renderer, const Mat4 &transform, uint32_t transformUpdated ) 35 { 36 Layer::draw(renderer, transform, transformUpdated); 37 38 _customCommand.init(_globalZOrder); 39 _customCommand.func = CC_CALLBACK_0 (CubeTexture::onDraw,this); 40 renderer->addCommand(&_customCommand); 41 } 42 43 void CubeTexture::onDraw() 44 { 45 Director::getInstance()->pushMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW); 46 Director::getInstance()->loadIdentityMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW); 47 Director::getInstance()->pushMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION); 48 Director::getInstance()->loadIdentityMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION); 49 50 Mat4 modelViewMatrix; 51 Mat4::createLookAt(Vec3(0,0,5), Vec3(0 ,0,0), Vec3(0,-1,0), &modelViewMatrix); 52 modelViewMatrix.translate(0, 0,0 ); 53 54 static float rotation = 20; 55 modelViewMatrix.rotate(Vec3(0,1,0),CC_DEGREES_TO_RADIANS(rotation)); 56 57 Mat4 projectionMatrix; 58 Mat4::createPerspective(60, 480/320, 1.0, 42, &projectionMatrix); 59 Director::getInstance()->multiplyMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION, projectionMatrix); 60 Director::getInstance()->multiplyMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW, modelViewMatrix); 61 62 typedef struct { 63 float Position[3]; 64 float Color[4]; 65 float TexCoord[2]; 66 } Vertex; 67 #define TEX_COORD_MAX 1 68 69 Vertex Vertices[] = { 70 // Front 71 {{1, -1, 0}, {1, 0, 0, 1}, {TEX_COORD_MAX, 0}}, 72 {{1, 1, 0}, {0, 1, 0, 1}, {TEX_COORD_MAX, TEX_COORD_MAX}}, 73 {{-1, 1, 0}, {0, 0, 1, 1}, {0, TEX_COORD_MAX}}, 74 {{-1, -1, 0}, {0, 0, 0, 1}, {0, 0}}, 75 // Back 76 {{1, 1, -2}, {1, 0, 0, 1}, {TEX_COORD_MAX, 0}}, 77 {{-1, -1, -2}, {0, 1, 0, 1}, {TEX_COORD_MAX, TEX_COORD_MAX}},78 {{1, -1, -2}, {0, 0, 1, 1}, {0, TEX_COORD_MAX}}, 79 {{-1, 1, -2}, {0, 0, 0, 1}, {0, 0}}, 80 // Left 81 {{-1, -1, 0}, {1, 0, 0, 1}, {TEX_COORD_MAX, 0}}, 82 {{-1, 1, 0}, {0, 1, 0, 1}, {TEX_COORD_MAX, TEX_COORD_MAX}}, 83 {{-1, 1, -2}, {0, 0, 1, 1}, {0, TEX_COORD_MAX}}, 84 {{-1, -1, -2}, {0, 0, 0, 1}, {0, 0 }}, 85 // Right 86 {{1, -1, -2}, {1, 0, 0, 1}, {TEX_COORD_MAX, 0}}, 87 {{1, 1, -2}, {0, 1, 0, 1}, {TEX_COORD_MAX, TEX_COORD_MAX}}, 88 {{1, 1, 0}, {0, 0, 1, 1}, {0, TEX_COORD_MAX}}, 89 {{1, -1, 0}, {0, 0, 0, 1}, {0, 0}}, 90 // Top 91 {{1, 1, 0}, {1, 0, 0, 1}, {TEX_COORD_MAX, 0}}, 92 {{1, 1, -2}, {0, 1, 0, 1}, {TEX_COORD_MAX, TEX_COORD_MAX}}, 93 {{-1, 1, -2}, {0, 0, 1, 1}, {0, TEX_COORD_MAX}}, 94 {{-1, 1, 0}, {0, 0, 0, 1}, {0, 0}}, 95 // Bottom 96 {{1, -1, -2}, {1, 0, < span style="color:rgb(128,0,128);line-height:1.5;">0, 1}, {TEX_COORD_MAX, 0}}, 97 {{1, -1, 0}, {0, 1, 0, 1}, {TEX_COORD_MAX, TEX_COORD_MAX}}, 98 {{-1, -1, 0}, {0, 0, 1, 1}, {0, TEX_COORD_MAX}}, 99 {{-1, -1, -2}, {0, 0, 0, 1}, {0, 0}}100 };101 int vertexCount = sizeof(Vertices) / sizeof(Vertices[0]);102 103 GLubyte Indices[] = {104 // Fro nt105 0, 1, 2,106 2, 3, 0,107 // Back108 4, 5, 6,109 4, 5, 7,110 // Left111 8, 9, 10,112 10,11, 8,113 // Right114 12, 13, 14,115 14, 15, 12,1 16 // Top117 16, 17, 18,118 18, 19, 16,119 // Bottom120138 139 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuffer);140 glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(Indices),Indices,GL_STATIC_DRAW);141 142 143 _positionLocation = glGetAttribLocation(mShaderProgram->getProgram(), "a_position");144 _colorLocation = glGetAttribLocation(mShaderProgram->getProgram(), "a_color");145 146 _textureLocation = glGetAttribLocation(mShaderProgram->getProgram(), "TextureCoord");147 _textureUniform = glGetUniformLocation(mShaderProgram->getProgram(), "CC_Texture0");148 149 mShaderProgram->use();150 mShaderProgram->setUniformsForBuiltins();151 152 glEnableVertexAttribArray(_positionLocation);153 glEnableVertexAttribArray(_colorLocation);154 glEnableVertexAttribArray(_textureLocation);155 156 glVertexAttribPointer(_positionLocation, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (GLvoid*)offsetof(Vertex, Position));157 158 glVertexAttribPointer(_colorLocation, 4, GL_FLOAT, GL_FALSE, sizeof(Vertex),(GLvoid*)offsetof(Vertex, Color));159 160 glVertexAttribPointer(_textureLocation, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex),161 (GLvoid*)offsetof(Vertex, TexCoord));162 //163 ////set sampler164 GL::bindTexture2DN(0, _textureID);165 //glActiveTexture( GL_TEXTURE0 );166 //glBindTexture(GL_TEXTURE_2D, _textureID);167 glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);168 glEnable(GL_BLEND);169 glEnable(GL_DEPTH_TEST);170 glDrawElements(GL_TRIANGLES, 36, GL_UNSIGNED_BYTE, 0);171 glUniform1i(_textureUniform, 0); // unnecc in practice172 173 glGenBuffers(1, &_vertexBuffer2);174 glBindBuffer(GL_ARRAY_BUFFER, _vertexBuffer2);175 glBufferData(GL_ARRAY_BUFFER, sizeof(Vertices2), Vertices2, GL_STATIC_DRAW);176 177 glGenBuffers(1, &_indexBuffer2);178 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, _indexBuffer2);179 glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(Indices2), Indices2, GL_STATIC_DRAW);180 181 glBindBuffer(GL_ARRAY_BUFFER, _vertexBuffer2);182 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, _indexBuffer2);183 184 GL::bindTexture2 DN(0, _textureID2);185 glUniform1i(_textureUniform, 0); // unnecc in practice186 187 glVertexAttribPointer(_positionLocation, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), 0);188 glVertexAttribPointer(_colorLocation, 4, GL_FLOAT, GL_FALSE, sizeof(Vertex), (GLvoid*) (sizeof(float) * 3));189 glVertexAttribPointer(_textureLocation, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (GLvoid*) (sizeof(float) * 7));190 191 glDrawElements(GL_TRIANGLE_S TRIP, sizeof(Indices2)/sizeof(Indices2[0]), GL_UNSIGNED_BYTE, 0);192 193 CC_INCREMENT_GL_DRAWN_BATCHES_AND_VERTICES(1,vertexCount);194 195 CHECK_GL_ERROR_DEBUG();196 glDisable(GL_DEPTH_TEST);197 198 Director::getInstance()->popMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION);199 Director::getInstance()->popMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW);200 }20, 21, 22,121 22, 23, 20122 };123 124 // 1) Add to top of file125 const Vertex Vertice s2[] = {126 {{0.5, -0.5, 0.01}, {1, 1, 1, 1}, {1, 1}},127 {{0.5, 0.5, 0.01}, { 1, 1, 1, 1}, {1, 0}},128 {{-0.5, 0.5, 0.01}, {1, 1, 1, 1}, {0, 0}},129 {{-0.5, -0.5, 0.01}, {1, 1, 1, 1}, {0, 1}},130 };131 132< /span> const GLubyte Indices2[] = {133 1, 0, 2, 3134 };135 136 glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer);137 glBufferData(GL_ARRAY_BUFFER,sizeof(Vertices),Vertices, GL_STATIC_DRAW);
1 #include"CubeTexture.h" 2 using namespace GL; 3 4 cocos2d::Scene* CubeTexture::createScene() 5 { 6 auto scene = Scene::create(); 7 auto layer = CubeTexture::create(); 8 scene->addChild(layer); 9 return scene; 10 } 11 12 bool CubeTexture::init() 13 { 14 if ( Layer::init() ) 15 { 16 mShaderProgram = new GLProgram; 17 mShaderProgram->initWithFilenames("myshader.vert","myshader.frag"); 18 mShaderProgram->link(); 19 mShaderProgram->updateUniforms(); 20 21 _textureID = Director::getInstance()->getTextureCache()->addImage( "HelloWorld.png" )->getName(); 22 _textureID2 = Director::getInstance()->getTextureCache()->addImage("item_powerup_fish.png")->getName(); 23 glGenBuffers( 1, &vertexBuffer ); 24 glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer ); 25 26 glGenBuffers( 1, &indexBuffer ); 27 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuffer ); 28 29 return true; 30 } 31 return false; 32 } 33 34 void CubeTexture::draw( Renderer *renderer, const Mat4 &transform, uint32_t transformUpdated ) 35 { 36 Layer::draw(renderer, transform, transformUpdated);37 38 _customCommand.init(_globalZOrder); 39 _customCommand.func = CC_CALLBACK_0(CubeTexture::onDraw,this); 40 renderer->addCommand(&_customCommand); 41 } 42 43 void CubeTexture::onDraw() 44 { 45 Director::getInstance()->pushMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW); 46 Director::getInstance()->loadIdentityMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW); 47 Director::getInstance()->pushMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION); 48 Director::getInstance()->loadIdentityMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION); 49 50 Mat4 modelViewMatrix; 51 Mat4::createLookAt(Vec3(0,0,5), Vec3(0,0,0), Vec3(0,-1,0), &modelViewMatrix); 52 modelViewMatrix.translate(0, 0,0 ); 53 54 static float rotation = 20; 55 modelViewMatrix.rotate(Vec3(0,1,0),CC_DEGREES_TO_RADIANS(rotation)); 56 57 Mat4 projectionMatrix; 58 Mat4::createPerspective(60, 480/320, 1.0, 42, &projectionMatrix); 59 Director::getInstance()->multiplyMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION, projectionMatrix); 60 Director::getInstance()->multiplyMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW, modelViewMatrix); 61 62 typedef struct { 63 float Position[3]; 64 float Color[4]; 65 float TexCoord[2]; 66 } Vertex; 67 #define TEX_COORD_MAX 1 68 69 Vertex Vertices[] = { 70 // Front 71 {{1, -1, 0}, {1, 0, 0, 1}, {TEX_COORD_MAX, 0}}, 72 {{1, 1, 0}, {0, 1, 0, 1}, {TEX_COORD_MAX, TEX_COORD_MAX}}, 73 {{-1, 1, 0}, {0, 0, 1, 1}, {0, TEX_COORD_MAX}}, 74 {{-1, -1, 0}, {0, 0, 0, 1}, {0, 0}}, 75 // Back 76 {{1, 1, -2}, {1, 0, 0, 1}, {TEX_COORD_MAX, 0}}, 77 {{-1, -1, -2}, {0, 1, 0, 1}, {TEX_COORD_MAX, TEX_COORD_MAX}}, 78 {{1, -1, -2}, {0, 0, 1, 1}, {0, TEX_COORD_MAX}}, 79 {{-1, 1, -2}, {0, 0, 0, 1}, {0, 0}}, 80 // Left 81 {{-1, -1, , 9, 10,112 10, 11, 8,113 // Right114 12, 13, 14,115 14, 15, 12,116 // Top117 16, 17, 18,118 18, 19, 160}, {1, 0, 0, 1}, {TEX_COORD_MAX, 0}}, 82 {{-1, 1, 0}, {0, 1, 0, 1}, {TEX_COORD_MAX, TEX_COORD_MAX}}, 83 {{-1, 1, -2}, {0, 0, 1, 1}, {0, TEX_COORD_MAX}}, 84 {{-1, -1, -2}, {0, 0, 0, 1}, {0, 0}}, 85 // Right 86 {{1, -1, -2}, {1, 0, 0, 1}, {TEX_COORD_MAX, 0}}, 87 {{1, 1, -2}, {0, 1, 0, 1}, {TEX_COORD_MAX, TEX_COORD_MAX}}, 88 {{1, 1, 0}, {0, 0, 1, 1}, {0, TEX_COORD_MAX}}, 89 {{1, -1, 0}, {0, 0, 0, 1}, {0, 0}}, 90 // Top 91 {{1, 1, 0}, {1, 0, 0, 1}, {TEX_COORD_MAX, 0}}, 92 {{1, 1, -2}, {0, 1, 0, 1}, {TEX_COORD_MAX, TEX_COORD_MAX}}, 93 {{-1, 1, -2}, {0, 0, 1, 1}, {0, TEX_COORD_MAX}}, 94 {{-1, 1, 0}, {0, 0, 0, 1}, {0, 0}}, 95 // Bottom 96 {{1, -1, -2}, {1, 0, 0, 1}, {TEX_COORD_MAX, 0}}, 97 {{1, -1, 0}, {0, 1, 0, 1}, {TEX_COORD_MAX, TEX_COORD_MAX}}, 98 {{-1, -1, 0}, {0, 0, 1, 1}, {0, TEX_COORD_MAX}}, 99 {{-1, -1, -2}, {0, 0, 0, 1}, {0, 0}}100 };101 int vertexCount = sizeof(Vertices) / sizeof(Vertices[0]);102 103 GLubyte Indices[] = {104 // Front105 0, 1, 2,106 2, 3, 0,107 // Back108 4, 5, 6,109 4, 5, 7,110 // Left111 8 ,119 // Bottom120 20, 21, 22,121 22, 23, 20122 };123 124 // 1) Add to top of file125 const Vertex Vertices2[] = {126 {{0.5, -0.5, 0.01}, {1, 1, 1, 1}, {1, 1}},127 {{0.5, 0.5, 0.01}, {1, 1, 1, 1}, {1, 0}},128 {{-0.5, 0.5, 0.01}, {1, 1, 1, 1}, {0, 0}},129 {{-0.5, -0.5, 0.01}, {1, 1, 1, 1}, {0, 1}},130 };131 132 const GLubyte Indices2[] = {133 1, 0, 2, 3134 };135 136 glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer);137 glBufferData(GL_ARRAY_BUFFER,sizeof(Vertices),Vertices, GL_STATIC_DRAW);138 139 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuffer);140 glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(Indices),Indices,GL_STATIC_DRAW);141 142 143 _positionLocation = glGetAttribLocation(m ShaderProgram->getProgram(), "a_position");144 _colorLocation = glGetAttribLocation(mShaderProgram->getProgram(), "a_color");145 146 _textureLocation = glGetAttribLocation(mShaderProgram->getProgram(), "TextureCoord");147 _textureUniform = glGetUniformLocation(mShaderProgram->getProgram(), "CC_Texture0");148 149 mShaderProgram->use();150 mShaderProgram->setUniformsForBuiltins();151 152 glEnableVertexAttribArray(_positionLocation);153 glEnableVertexAttribArray(_colorLocation);154 glEnableVertexAttribArray(_textureLocation);155 156 glVertexAttribPointer(_positionLocation, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (GLvoid*)offsetof(Vertex, Position));157 158 glVertexAttribPointer(_colorLocation, 4, GL_FLOAT, GL_FALSE, sizeof(Vertex),(GLvoid*)of fsetof(Vertex, Color));159 160 glVertexAttribPointer(_textureLocation, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex),161 (GLvoid*)offsetof(Vertex, TexCoord));162 //163 ////set sampler164 GL::bindTexture2DN(0, _textureID);165 //glActiveTexture( GL_TEXTURE0 );166 //glBindTexture(GL_TEXTURE_2D, _textureID);167 glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);168 glEnable(GL_BLEND);169 glEnable(GL_DEPTH_TEST);170 glDrawElements(GL_TRIANGLES, 36, GL_UNSIGNED_BYTE, 0);171 glUniform1i(_textureUniform, 0); // unnecc in practice172 173 glGenBuffers(1, &_vertexBuffer2);174 glBindBuffer(GL_ARRAY_BUFFER, _vertexBuffer2);175 glBufferData(GL_ARRAY_BUFFER, sizeof(Vertices2), Vertices2, GL_STATIC_DRAW);176 177 glGenBuffers(1, &_indexBuffer2);178 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, _indexBuffer2);179 glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(Indices2), Indices2, GL_STATIC_DRAW);180 181 glBindBuffer(GL_ARRAY_BUFFER, _vertexBuffer2);< span style="color:rgb(0,128,128);line-height:1.5;">182 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, _indexBuffer2);183 184 GL::bindTexture2DN(0, _textureID2);185 glUniform1i(_textureUniform, 0); // unnecc in practice186 187 glVertexAttribPointer(_positionLocation, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), 0);188 glVertexAttribPointer(_colorLocation, 4, GL_FLOAT, GL_FALSE, sizeof(Vertex), (GLvoid*) (sizeof(float) * 3));189 glVertexAttribPointer(_textureLocation, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (GLvoid*) (sizeof(float) * 7));190 191 glDrawElements(GL_TRIANGLE_STRIP, sizeof(Indices2)/sizeof(Indices2[0]), GL_UNSIGNED_BYTE, 0);192 193 CC_INCREMENT_GL_DRAWN_BATCHES_AND_VERTICES(1,vertexCount);194 195 CHECK_GL_ERROR_DEBUG();196 glDisable(GL_DEPTH_TEST);197 198 Director::getInstance()->popMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION);199 Director::getInstance()->popMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW);200 }
1 attribute vec4 a_position; 2 attribute vec2 a_texCoord;3 4 varying vec2 v_texCoord; 5 6 void main(void) {7 gl_Position = CC_MVPMatrix * a_position; 8 v_texCoord = a_texCoord;9 }
1 attribute vec4 a_position; 2 attribute vec2 a_texCoord;3 4 varying vec2 v_texCoord; 5 6 void main(void) {7 gl_Position = CC_MVPMatrix * a_position; 8 v_texCoord = a_texCoord;9 }
1 precision mediump float; 2 varying vec2 v_texCoord; 3 //uniform sampler2D s_lightMap; 4 / /uniform sampler2D s_baseMap; 5 6 7 void main(void) { 8 vec4 baseColor; 9 vec4 lightColor;10 //baseColor = texture2D( s_baseMap, v_texCoord);11 //lightColor = texture2D( s_lightMap, v_texCoord );12 baseColor = texture2D( CC_Texture0, v_texCoord);13 lightColor = texture2D( CC_Texture1, v_texCoord ); 14 gl_FragColor = baseColor * ( lightColor + 0.25 ); 15 }
1 precision mediump float; 2 varying vec2 v_texCoord; 3 //uniform sampler2D s_lightMap; 4 //uniform sampler2D s_baseMap; 5 6 7 void main(void) { 8 vec4 baseColor; 9 vec4 lightColor;10 //baseColor = texture2D( s_baseMap, v_texCoord);11 //lightColor = texture2D( s_lightMap, v_texCoord );12 baseColor = texture2D( CC_Texture0, v_texCoord);13 lightColor = texture2D( CC_Texture1, v_texCoord ); 14 gl_FragColor = baseColor * ( lightColor + 0.25 ); 15 }
MultiTexture.h
1 #include "MultiTexture.h" 2 3 cocos2d::Scene* MultiTexture::createScene() 4 { 5 auto scene = Scene::create(); 6 auto layer = MultiTexture::create(); 7 scene->addChild(layer); 8 return scene; 9 } 10 11 bool MultiTexture::init() 12 { 13 if ( Layer::init() ) 14 { 15 mShaderProgram = new GLProgram; 16 mShaderProgram->initWithFilenames("multiTexture.vert","multiTexture.frag"); 17 mShaderProgram->link(); 18 mShaderProgram->updateUniforms(); 19 20 _baseMapTexId = Director::getInstance()->getTextureCache()->addIm age( "HelloWorld.png" )->getName(); 21 _lightMapTexId = Director::getInstance()->getTextureCache()->addImage("crate.jpg")->getName(); 22 glGenVertexArrays(1, &VAO); 23 glBindVertexArray(VAO); 24 25 glGenBuffers( 1, &vertexBuffer ); 26 glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer ); 27 28 glGenBuffers( 1, &indexBuffer ); 29 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuffer ); 30 31 return true; 32 } 33 return false; 34 } 35 36 void MultiTexture::draw( Renderer *renderer, const Mat4 &transform, uint32_t transformUpdated ) 37 { 38 Layer::draw(renderer, transform, transformUpdated); 39 40 _customCommand.init(_globalZOrder); 41 _customCommand.func = CC_CALLBACK_0(MultiTexture::onDraw,this); 42 renderer->addCommand(&_customCommand); 43 } 44 45 void MultiTexture::onDraw() 46 { 47 Director::getInstance()->pushMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW); 48 Director::getInstance()->loadIdentityMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW); 49 Director::getInstance()->pushMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION); 50 Director::getInstance()->loadIdentityMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION); 5152 typedef struct { 53 float Position[3]; 54 float TexCoord[2]; 55 } Vertex; 56 #define TEX_COORD_MAX 1 57 58 Vertex Vertices[] = { 59 60 {{-0.5, 0.5, 0}, {0, 0}}, 61 {{-0.5, -0.5, 0}, {0, TEX_COORD_MAX}}, 62 {{0.5, -0.5, 0}, { TEX_COORD_MAX,TEX_COORD_MAX}}, 63 {{0.5, 0.5, 0}, {TEX_COORD_MAX, 0}}, 64 65 }; 66 int ver texCount = sizeof(Vertices) / sizeof(Vertices[0]); 67 68 GLubyte Indices[] = { 69 0, 1, 2, 70 2, 3, 0< span style="line-height:1.5;">, 71 }; 72 73 glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer); 74 glBufferData(GL_ARRAY_BUFFER,sizeof(Vertices),Vertices, GL_STATIC_DRAW); 75 76 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuffer); 77 glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(Indices),Indices,GL_STATIC_DRAW); 78 79 _positionLoc = glGetAttribLocation(mShaderProgram->getProgram(), "a_position"); 80 _texCoordLoc = glGetAttribLocation(mShaderProgram->getProgram(), "a_texCoord"); 81 //_ baseMapLoc = glGetUniformLocation(mShaderProgram->getProgram(), "s_baseMap"); 82 //_lightMapLoc = glGetUniformLocation(mShaderProgram->getProgram(), "s_lightMap"); 83 _baseMapLoc = glGetUniformLocation(mShaderProgram->getProgram(), "CC_Texture0"); 84 _lightMapLoc = glGetUniformLocation(mShaderProgram->getProgram(), "CC_Texture1"); 85 86 glEnableVertexAttribArray(_positionLoc); 87 glEnableVertexAttribArray(_texCoordLoc); 88 89 glVertexAttribPointer(_positionLoc, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (GLvoid*)offsetof(Vertex, Position)); 90 glVertexAttribPointer(_texCoordLoc, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), 91 (GLvoid*)offsetof(Vertex, TexCoord)); 92 93 mShaderProgram->use(); 94 mShaderProgram->setUniformsForBuiltins(); 95 96 glEnable(GL_DEPTH_TEST); 97 glBindVertexArray(VAO); 98 99 GL::bindTexture2DN(0, _lightMapTexId);100 glUniform1i(_lightMapLoc, 0 ); // unnecc in practice101 102 GL::bindTexture2DN(1, _baseMapTexId);103 glUniform1i(_baseMapLoc, 1); // unne cc in practice104 105 glDrawElements(GL_TRIANGLES,6, GL_UNSIGNED_BYTE, 0 );106 107 glBindVertexArray(0);108 CC_INCREMENT_GL_DRAWN_BATCHES_AND_VERTICES(1,6);109 110 CHECK_GL_ERROR_DEBUG();111 glDisable(GL_DEPTH_TEST);112 113 Director::getInstance()->popMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION);114 Director::getInstance()->popMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW);115 }
1 #include "MultiTexture.h" 2 3 cocos2d::Scene* MultiTexture::createScene() 4 { 5 auto scene = Scene::create(); 6 auto layer = Mult iTexture::create(); 7 scene->addChild(layer); 8 return scene; 9 } 10 11 bool MultiTexture::init() 12 { 13 if ( Layer::init() ) 14 { 15 mShaderProgram = new GLProgram; 16 mShaderProgram->initWithFilenames("multiTexture.vert","multiTexture.frag"); 17 mShaderProgram->link(); 18 mShader Program->updateUniforms(); 19 20 _baseMapTexId = Director::getInstance()->getTextureCache()->addImage( "HelloWorld.png" )->getName(); 21 _lightMapTexId = Director::getInstance()->getTextureCache()->addImage("crate.jpg")->getName(); 22 glGenVertexArrays(1, &VAO); 23 glBindVertexArray(VAO); 24 25 glGenBuffers( 1, &vertexBuffer ); 26 glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer ); 27 28 glGenBuffers( 1, &indexBuffer ); 29 glBindBuf fer(GL_ELEMENT_ARRAY_BUFFER, indexBuffer ); 30 31 return true; 32 } 33 return false; 34 } 35 36 void MultiTexture::draw( Rend erer *renderer, const Mat4 &transform, uint32_t transformUpdated ) 37 { 38 Layer::draw(renderer, transform, transformUpdated); 39 40 _customCommand.init(_globalZOrder); 41 _customCommand.func = CC_CALLBACK_0(MultiTexture::onDraw,this); 42 renderer->addCommand(&_customCommand); 43 } 44 45 void MultiTexture::onDraw() 46 { 47 Director::getInstance()->pushMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW); 48 Director::getInstance()->loadIdentityMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW); 49 Director::getInstance()->pushMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION); 50 Director::getInstance()->loadIdentityMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION); 51 52 typedef struct { 53 float Position[3]; 54 float TexCoord[2]; 55 } Vertex; 56 #define TEX_COORD_MAX 1 57 58 Vertex Vertices[] = { 59 60 {{-0.5, 0.5, 0}, {0, 0}}, 61 {{-0.5, -0.5, 0}, {0, TEX_COORD_MAX}}, 62 {{0.5, -0.5, 0}, { TEX_COORD_MAX,TEX_COORD_MAX}}, 63 {{0.5, 0.5, 0}, {TEX_COORD_MAX, 0}}, 64 65 }; 66 int vertexCount = sizeof(Vertices) / sizeof(Vertices[0]); 67 68 GLubyte Indices[] = { 69 0, 1, 2, 70 2, 3, 0, 71 }; 72 73 glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer); 74 glBufferData(GL_ARRAY_BUFFER,sizeof(Vertices),Vertices, GL_STATIC_DRAW); 75 76 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuffer); 77 glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(Indices),Indices,GL_STATIC_DRAW); 78 79 _positionLoc = glGetAttribLocation(mShaderProgram->getProgram(), "a_position"); 80 _texCoordLoc = glGetAttribLocation(mShaderProgram->getProgram(), "a_texCoord"); 81 //_baseMapLoc = glGetUniformLocation(mShaderProgram->getProgram(), "s_baseMap"); 82 //_lightMapLoc = glGetUniformLocation(mShaderProgram->getProgram(), "s_lightMap"); 83 _baseMapLoc = glGetUniformLocation(mShaderProgram->getProgram(), "CC_Texture0"); 84 _lightMapLoc = glGetUniformLocation(mShaderProgram->getProgram(), "CC_Texture1"); 85 86 glEnableVertexAttribArray(_positionLoc); 87 glEnableVertexAttribArray(_texCoordLoc); 88 89 glVertexAttribPointer(_positionLoc, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (GL void*)offsetof(Vertex, Position)); 90 glVertexAttribPointer(_texCoordLoc, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), 91 (GLvoid*)offsetof(Vertex, TexCoord)); 92 93 mShaderProgram->use(); 94 mShaderProgram->setUniformsForBuiltins(); 95 96 glEnable(GL_DEPTH_TEST); 97 glBindVertexArray(VAO); 98 99 GL::bindTexture2DN(0, _lightMapTexId);100 glUniform1i(_lightMapLoc, 0 ); // unnecc in practice101 102 GL::bindTexture2DN(1, _baseMapTexId);103 glUniform1i(_baseMapLoc, 1); // unnecc in practice104 105 glDrawElements(GL_TRIANGLES,6, GL_UNSIGNED_BYTE, 0 );106 107 glBindVertexArray(0);108 CC_INCREMENT_GL_DRAWN_BATCHES_AND_VERTICES(1,6);109 110 CHECK_GL_ERROR_DEBUG();111 glDisable(GL_DEPTH_TEST);112 113 Director::getInstance()->popMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION);114 Director::getInstance()->popMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW);115 }
