cocos2d-x学习笔记——双重纹理透明特效

// // MultiSprite.cpp // Tools // // Created by apple on 16/11/7. // // #include "MultiSprite.h" namespace YXTools { static unsigned short quadIndices[]={0,1,2, 3,2,1}; MultiSprite::MultiSprite(): Sprite(), _lightTexture(nullptr) { } MultiSprite * MultiSprite::create(std::string filename, std::string lightTexture) { MultiSprite * sprite = new MultiSprite(); if (sprite && sprite->init(filename, lightTexture)) { sprite->autorelease(); return sprite; } CC_SAFE_DELETE(sprite); return nullptr; } bool MultiSprite::init(std::string baseFilename, std::string lightFilename) { bool ret = Sprite::initWithFile(baseFilename); const char fragmentShader[] = "#ifdef GL_ES \n" "precision lowp float; \n" "#endif \n" "varying vec4 v_fragmentColor; \n" "varying vec2 v_texCoord; \n" "varying vec2 v_texCoord1; \n" "void main() \n" "{ \n" " vec4 baseColor; \n" " baseColor = texture2D( CC_Texture0, v_texCoord )*v_fragmentColor; \n" " vec4 lightColor; \n" " if (v_texCoord1.x>1.0 || v_texCoord1.y>1.0 || v_texCoord1.y < 0.0 || v_texCoord1.x<0.0 ) \n" " { \n" " lightColor = vec4(0, 0, 0, 1); \n" " } \n" " else \n" " { \n" " lightColor = texture2D( CC_Texture1, v_texCoord1 ); \n" " } \n" " gl_FragColor = baseColor * (lightColor + 0.25); \n" " \n" "} \n"; const char vectShader[] = "attribute vec4 a_position; \n" "attribute vec2 a_texCoord; \n" "attribute vec2 a_texCoord1; \n" "attribute vec4 a_color; \n" "#ifdef GL_ES \n" "varying lowp vec4 v_fragmentColor; \n" "varying mediump vec2 v_texCoord; \n" "varying mediump vec2 v_texCoord1; \n" "#else \n" "varying vec4 v_fragmentColor; \n" "varying vec2 v_texCoord; \n" "varying vec2 v_texCoord1; \n" "#endif \n" "void main() \n" "{ \n" " gl_Position = CC_MVPMatrix * a_position; \n" " v_fragmentColor = a_color; \n" " v_texCoord = a_texCoord; \n" " v_texCoord1 = a_texCoord1; \n" "} \n"; GLProgram * program = GLProgram::createWithByteArrays(vectShader, fragmentShader); setGLProgramState(GLProgramState::getOrCreateWithGLProgram(program)); _multiCommand.func = CC_CALLBACK_0(MultiSprite::renderMultiSprite, this); setLightTexture(lightFilename); setRectInBase(Rect(Vec2::ZERO, _texture->getContentSize())); return ret; } void MultiSprite::setLightTexture(std::string filename) { setLightTexture(Director::getInstance()->getTextureCache()->addImage(filename)); } void MultiSprite::setLightTexture(cocos2d::Texture2D *texture) { if (texture != _lightTexture) { CC_SAFE_RELEASE(_lightTexture); _lightTexture = texture; CC_SAFE_RETAIN(texture); } } void MultiSprite::draw(cocos2d::Renderer *renderer, const cocos2d::Mat4 &transform, uint32_t flags) { _multiCommand.init(_globalZOrder, transform, flags); renderer->addCommand(&_multiCommand); } void MultiSprite::setRectInBase(cocos2d::Rect rect) { if (!_rectInBase.equals(rect)) { _rectInBase = rect; PolygonInfo baseInfo = _polyInfo; Size baseContentSize = _texture->getContentSize(); //坐标确定，纹理坐标值越大，单张纹理（0到1）越小 float lightScaleX = _rectInBase.size.width/baseContentSize.width; float lightScaleY = _rectInBase.size.height/baseContentSize.height; float originX = -(_rectInBase.origin.x/baseContentSize.width/lightScaleX); float originY = -((baseContentSize.height-_rectInBase.origin.y-_rectInBase.size.height)/baseContentSize.height/lightScaleY); // 0, 0 0, 1 1, 0 1, 1 for (int i = 0; i<4; ++i) { _verts[i].color = Color4F::WHITE; _verts[i].vertices = baseInfo.triangles.verts[i].vertices; _verts[i].texCoords = baseInfo.triangles.verts[i].texCoords; } _verts[0].texCoords1 = Tex2F( originX, originY); _verts[1].texCoords1 = Tex2F( originX, 1/lightScaleY+originY); _verts[2].texCoords1 = Tex2F( 1/lightScaleX+originX, originY); _verts[3].texCoords1 = Tex2F( 1/lightScaleX+originX, 1/lightScaleY+originY); } } void MultiSprite::renderMultiSprite() { //load mv _glProgramState->apply(_modelViewTransform); float size = sizeof(V3F_C4F_T2F2); // Load the vertex position glVertexAttribPointer ( GLProgram::VERTEX_ATTRIB_POSITION, 3, GL_FLOAT, GL_FALSE, size, &_verts[0]); glVertexAttribPointer ( GLProgram::VERTEX_ATTRIB_COLOR, 4, GL_FLOAT, GL_FALSE, size, &(_verts[0].color)); // Load the texture coordinate glVertexAttribPointer ( GLProgram::VERTEX_ATTRIB_TEX_COORD, 2, GL_FLOAT, GL_FALSE, size, &(_verts[0].texCoords)); glVertexAttribPointer ( GLProgram::VERTEX_ATTRIB_TEX_COORD1, 2, GL_FLOAT, GL_FALSE, size, &(_verts[0].texCoords1)); glEnableVertexAttribArray ( GLProgram::VERTEX_ATTRIB_POSITION ); glEnableVertexAttribA