Cocos2dx - CCSprite使用 shader生成自己想要的颜色的图片

分类：cocos2dx 2013-05-30 11:14 6914人阅读 评论(1) 收藏 举报

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1. classBYGraySprite:publicCCSprite{
3. public:
4. BYGraySprite();
5. virtual~BYGraySprite();
6. staticBYGraySprite*create(constchar*pszFileName);
7. boolinitWithTexture(CCTexture2D*pTexture,constCCRect&tRect);
8. virtualvoiddraw();
9. };

copy

#include"BYGraySprite.h"
1. BYGraySprite::BYGraySprite(){
3. }
4. BYGraySprite::~BYGraySprite(){
5. BYGraySprite*BYGraySprite::create(char*pszFileName){
6. BYGraySprite*graySprite=newBYGraySprite;
7. if(graySprite&&graySprite->initWithFile(pszFileName)){
8. graySprite->autorelease();
9. returngraySprite;
10. }else{
11. CC_SAFE_RELEASE(graySprite);
12. returnNULL;
13. }
14. boolBYGraySprite::initWithTexture(CCTexture2D*pTexture,153); font-weight:bold; background-color:inherit">constCCRect&tRect){
15. do{
16. CC_BREAK_IF(!CCSprite::initWithTexture(pTexture,tRect));
17. GLchar*pszFragSource=
18. "#ifdefGL_ES\n\
19. precisionmediumpfloat;\n\
20. #endif\n\
21. uniformsampler2Du_texture;\n\
22. varyingvec2v_texCoord;\n\
23. varyingvec4v_fragmentColor;\n\
24. voidmain(void)\n\
25. {\n\
26. //ConverttogreyscaleusingNTSCweightings\n\
27. floatgrey=dot(texture2D(u_texture,v_texCoord).rgba,vec4(0.5,0.0,0.7));\n\
28. gl_FragColor=vec4(grey,0.0);\n\
29. }";
30. CCGLProgram*pProgram=newCCGLProgram();
31. pProgram->initWithVertexShaderByteArray(ccPositionTextureColor_vert,pszFragSource);
32. this->setShaderProgram(pProgram);
33. pProgram->release();
34. CHECK_GL_ERROR_DEBUG();
35. this->getShaderProgram()->addAttribute(kCCAttributeNamePosition,kCCVertexAttrib_Position);
36. this->getShaderProgram()->addAttribute(kCCAttributeNameColor,kCCVertexAttrib_Color);
37. this->getShaderProgram()->addAttribute(kCCAttributeNameTexCoord,kCCVertexAttrib_TexCoords);
38. CHECK_GL_ERROR_DEBUG();
39. this->getShaderProgram()->link();
40. this->getShaderProgram()->updateUniforms();
41. returntrue;
42. while(0);
43. false;
44. voidBYGraySprite::draw(){
45. ccGLEnableVertexAttribs(kCCVertexAttribFlag_PosColorTex);
46. ccGLBlendFunc(m_sBlendFunc.src,m_sBlendFunc.dst);
47. this->getShaderProgram()->use();
48. this->getShaderProgram()->setUniformForModelViewProjectionMatrix();
49. ccGLBindTexture2D(this->getTexture()->getName());
50. #definekQuadSizesizeof(m_sQuad.bl)
51. longoffset=(long)&m_sQuad;
52. //vertex
53. intdiff=offsetof(ccV3F_C4B_T2F,vertices);
54. glVertexAttribPointer(kCCVertexAttrib_Position,3,GL_FLOAT,GL_FALSE,kQuadSize,(void*)(offset+diff));
55. //texCoods
56. diff=offsetof(ccV3F_C4B_T2F,texCoords);
57. glVertexAttribPointer(kCCVertexAttrib_TexCoords,2,0); background-color:inherit">//color
58. glVertexAttribPointer(kCCVertexAttrib_Color,4,GL_UNSIGNED_BYTE,GL_TRUE,248)"> glDrawArrays(GL_TRIANGLE_STRIP,4);
59. CC_INCREMENT_GL_DRAWS(1);
60. }