OpenGL分屏代码.doc

图具体如下：/ FBOM.cpp : 定义控制台应用程序的入口点。/#include stdafx.h#include #include #include #include #include #include #include #include #include /本程序的目标是在shader里画图并读入到FBO中。然后在进行展示，分三屏。using namespace std;#ifdef _APPLE_#include #else#define FREEGLUT_STATIC#include #endif/各种int#include GLfloat vWhite=1.0,1.0,1.0,1.0;GLfloat vRed=1.0,0.0,0.0,1.0;GLfloat vGreen=0.0,1.0,0.0,1.0;GLfloat vBlue=0.0,0.0,1.0,1.0;GLfloat vLightPos=3.0,3.0,3.0,1.0;GLfloat vAmbient=0.02,0.02,0.02,1.0;GLfloat vDiffuse=0.3,0.3,0.3,1.0;GLfloat vSpecular=0.3,0.3,0.3,1.0;/程序的标志位GLuint screenWidth;GLuint screenHeight;GLboolean uFBO=GL_FALSE;/初始化窗口组件GLMatrixStack modelViewMatrix;GLMatrixStack projectionMatrix;GLGeometryTransform transformPipline;GLFrustum viewFrustum;GLFrame viewFrame;GLShaderManager shaderManager;/创建shaderGLuint fboShader;GLuint locMVP;GLuint locMV;GLuint locNormal;GLuint locLight;GLuint locDiffuse;GLuint locAmbient;GLuint locSpecular;GLuint locTexture;GLuint locLumicurve;GLuint RfboShader;GLuint RlocMVP;GLuint RlocMV;GLuint RlocNormal;GLuint RlocLight;GLuint RlocDiffuse;GLuint RlocAmbient;GLuint RlocSpecular;GLuint RlocTexture;GLuint RlocLumicurve;/创建FBO一系列GLuint FBObj1;GLuint colorBObj3;GLuint depthBObj1;GLuint texBObj3;GLuint texBOTexture1;GLint lum=2;static const GLenum drawWindow=GL_BACK_LEFT;static const GLenum drawBuff=GL_COLOR_ATTACHMENT0,GL_COLOR_ATTACHMENT1,GL_COLOR_ATTACHMENT2;/创建所画的图形GLBatch floorBatch;GLTriangleBatch sphereBatch;GLuint floorTex;GLuint ballTex;float* LoadDATAFile(const char* szFile,int* count)GLint lineCount=0;FILE* fp;float* data=0;/fp=fopen(szFile,r);if (fp!=NULL)char szFloat1024;while (fgets(szFloat,sizeof szFloat,fp)lineCount+;rewind(fp);data=(float*)malloc(lineCount*sizeof(float);if (data!=NULL)int index=0;while (fgets(szFloat,sizeof szFloat,fp)!=NULL)dataindex=(float)atof(szFloat);/这是一个很好的将数组和指针的转化。index+;count0=lineCount;elsereturn 0;return data;GLboolean LoadTGATextrue(const char*szFile,GLenum minFilter,GLenum magFilter,GLenum wrapMode)GLbyte* pBits;GLint nWidth,nHeigh,nComponents;GLenum eFormat;pBits=gltReadTGABits(szFile,&nWidth,&nHeigh,&nComponents,&eFormat);if (pBits=NULL)return GL_FALSE;glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,minFilter);glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,magFilter);glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,wrapMode);glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,wrapMode);glPixelStorei(GL_UNPACK_ALIGNMENT,1);glTexImage2D(GL_TEXTURE_2D,0,nComponents,nWidth,nHeigh,0,eFormat,GL_UNSIGNED_BYTE,pBits);if (minFilter=GL_LINEAR_MIPMAP_LINEAR|minFilter=GL_LINEAR_MIPMAP_NEAREST|minFilter=GL_NEAREST_MIPMAP_LINEAR|minFilter=GL_NEAREST_MIPMAP_NEAREST)glGenerateMipmap(GL_TEXTURE_2D);return GL_TRUE;void SetupRC()glClearColor(1.0,0.0,0.0,1.0);shaderManager.InitializeStockShaders();glEnable(GL_DEPTH_TEST);floorBatch.Begin(GL_TRIANGLE_FAN,4,1);floorBatch.Color4f(0.0f, 1.0f, 0.0f, 0.25);floorBatch.MultiTexCoord2f(0, 0.0f, 0.0f);floorBatch.Normal3f(0.0, 1.0f, 0.0f);floorBatch.Vertex3f(-20.0f, -1.41f, 20.0f);floorBatch.Color4f(0.0f, 1.0f, 0.0f, 0.25);floorBatch.MultiTexCoord2f(0, 10.0f, 0.0f);floorBatch.Normal3f(0.0, 1.0f, 0.0f);floorBatch.Vertex3f(20.0f, -1.41f, 20.0f);floorBatch.Color4f(0.0f, 1.0f, 0.0f, 0.25);floorBatch.MultiTexCoord2f(0, 10.0f, 10.0f);floorBatch.Normal3f(0.0, 1.0f, 0.0f);floorBatch.Vertex3f(20.0f, -1.41f, -20.0f);floorBatch.Color4f(0.0f, 1.0f, 0.0f, 0.25);floorBatch.MultiTexCoord2f(0, 0.0f, 10.0f);floorBatch.Normal3f(0.0, 1.0f, 0.0f);floorBatch.Vertex3f(-20.0f, -1.41f, -20.0f);floorBatch.End();gltMakeSphere(sphereBatch,0.8,52,52);/初始化地板纹理glActiveTexture(GL_TEXTURE0);glGenTextures(1,&floorTex);glBindTexture(GL_TEXTURE_2D,floorTex);LoadTGATextrue(stone.tga,GL_LINEAR_MIPMAP_LINEAR,GL_LINEAR,GL_REPEAT);glActiveTexture(GL_TEXTURE1);glGenTextures(1,&ballTex);glBindTexture(GL_TEXTURE_2D,ballTex);LoadTGATextrue(tarnish.tga,GL_LINEAR_MIPMAP_LINEAR,GL_LINEAR,GL_CLAMP_TO_EDGE);/texbo初始化, -最神奇的是这里还有两种不同的-共用一个绑定点。glGenBuffers(3,texBObj);glGenTextures(1,texBOTexture);int count=0;float* data=0;data=LoadDATAFile(LumTan.data,&count);if (count0)glBindBuffer(GL_TEXTURE_BUFFER,texBObj0);glBufferData(GL_TEXTURE_BUFFER,sizeof(float)*count,data,GL_STATIC_DRAW);delete(data);data=LoadDATAFile(LumSin.data,&count);if (count0)glBindBuffer(GL_TEXTURE_BUFFER,texBObj1);glBufferData(GL_TEXTURE_BUFFER,sizeof(float)*count,data,GL_STATIC_DRAW);delete(data);data=LoadDATAFile(LumLinear.data,&count);if (count0)glBindBuffer(GL_TEXTURE_BUFFER,texBObj2);glBufferData(GL_TEXTURE_BUFFER,sizeof(float)*count,data,GL_STATIC_DRAW);delete(data);glActiveTexture(GL_TEXTURE2);/为甚么会这样，就是因为没有方法作为 让gl_texturen作为别名的方法。因此就这样了。glBindTexture(GL_TEXTURE_BUFFER,texBOTexture0);glTexBuffer(GL_TEXTURE_BUFFER,GL_R32F,texBObj0);/fbo初始化glGenFramebuffers(1,FBObj);glBindFramebuffer(GL_DRAW_FRAMEBUFFER,FBObj0);glGenRenderbuffers(1,depthBObj);glBindRenderbuffer(GL_RENDERBUFFER,depthBObj0);/现在才明白，绑定点是变量名称啊glRenderbufferStorage(GL_RENDERBUFFER,GL_DEPTH_COMPONENT32,screenWidth,screenHeight);glGenRenderbuffers(3,colorBObj);glBindRenderbuffer(GL_RENDERBUFFER,colorBObj0);glRenderbufferStorage(GL_RENDERBUFFER,GL_RGB8,screenWidth,screenHeight);glBindRenderbuffer(GL_RENDERBUFFER,colorBObj1);glRenderbufferStorage(GL_RENDERBUFFER,GL_RGB8,screenWidth,screenHeight);glBindRenderbuffer(GL_RENDERBUFFER,colorBObj2);glRenderbufferStorage(GL_RENDERBUFFER,GL_RGB8,screenWidth,screenHeight);glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER,GL_DEPTH_ATTACHMENT,GL_RENDERBUFFER,depthBObj0);glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER,GL_COLOR_ATTACHMENT0,GL_RENDERBUFFER,colorBObj0);glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER,GL_COLOR_ATTACHMENT1,GL_RENDERBUFFER,colorBObj1);glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER,GL_COLOR_ATTACHMENT2,GL_RENDERBUFFER,colorBObj2);glBindFramebuffer(GL_DRAW_FRAMEBUFFER,0);/shader初始化fboShader=gltLoadShaderPairWithAttributes(fbo.vs,fbo.fs,3,GLT_ATTRIBUTE_VERTEX,vVertex,GLT_ATTRIBUTE_TEXTURE0,vCoords,GLT_ATTRIBUTE_NORMAL,vNormal);RfboShader=gltLoadShaderPairWithAttributes(fboR.vs,fboR.fs,3,GLT_ATTRIBUTE_VERTEX,vVertex,GLT_ATTRIBUTE_TEXTURE0,vCoords,GLT_ATTRIBUTE_NORMAL,vNormal);locNormal=glGetUniformLocation(fboShader,normalMatrix);locMV=glGetUniformLocation(fboShader,mvMatrix);locMVP=glGetUniformLocation(fboShader,mvpMatrix);locLight=glGetUniformLocation(fboShader,locLight);locAmbient=glGetUniformLocation(fboShader,ambient);locDiffuse=glGetUniformLocation(fboShader,diffuse);locSpecular=glGetUniformLocation(fboShader,specular);locTexture=glGetUniformLocation(fboShader,a_texture);locLumicurve=glGetUniformLocation(fboShader,lumCurveSampler);RlocNormal=glGetUniformLocation(RfboShader,normalMatrix);RlocMV=glGetUniformLocation(RfboShader,mvMatrix);RlocMVP=glGetUniformLocation(RfboShader,mvpMatrix);RlocLight=glGetUniformLocation(RfboShader,locLight);RlocAmbient=glGetUniformLocation(RfboShader,ambient);RlocDiffuse=glGetUniformLocation(RfboShader,diffuse);RlocSpecular=glGetUniformLocation(RfboShader,specular);RlocTexture=glGetUniformLocation(RfboShader,a_texture);RlocLumicurve=glGetUniformLocation(RfboShader,lumCurveSampler);viewFrame.MoveForward(6.0);gltCheckErrors();void ShutdownRC()glDeleteRenderbuffers(1,depthBObj);glDeleteRenderbuffers(3,colorBObj);glDeleteBuffers(3,texBObj);glDeleteFramebuffers(1,FBObj);glDeleteProgram(fboShader);glDeleteTextures(1,&floorTex);glDeleteTextures(1,&ballTex);glDeleteTextures(1,texBOTexture);void RenderScene()static CStopWatch stopWatch;glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);if (!uFBO)modelViewMatrix.PushMatrix();modelViewMatrix.MultMatrix(viewFrame);glUseProgram(fboShader);glUniformMatrix4fv(locMVP,1,GL_FALSE,transformPipline.GetModelViewProjectionMatrix();glUniformMatrix4fv(locMV,1,GL_FALSE,transformPipline.GetModelViewMatrix();glUniformMatrix3fv(locNormal,1,GL_FALSE,transformPipline.GetNormalMatrix();glUniform1i(locTexture,0);glUniform4fv(locLight,1,vLightPos);glUniform4fv(locAmbient,1,vAmbient);glUniform4fv(locDiffuse,1,vDiffuse);glUniform4fv(locSpecular,1,vSpecular);floorBatch.Draw();modelViewMatrix.PushMatrix();modelViewMatrix.Rotate(stopWatch.GetElapsedSeconds()*10,0,1.0,0);glUniformMatrix4fv(locMVP,1,GL_FALSE,transformPipline.GetModelViewProjectionMatrix();glUniformMatrix4fv(locMV,1,GL_FALSE,transformPipline.GetModelViewMatrix();glUniformMatrix3fv(locNormal,1,GL_FALSE,transformPipline.GetNormalMatrix();glUniform1i(locTexture,1);sphereBatch.Draw();modelViewMatrix.PopMatrix();modelViewMatrix.PopMatrix();else/告诉它先向自己定义的缓冲区里面进行绘制。glBindFramebuffer(GL_DRAW_FRAMEBUFFER,FBObj0);glDrawBuffers(3,drawBuff);glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);modelViewMatrix.PushMatrix();modelViewMatrix.MultMatrix(viewFrame);glUseProgram(RfboShader);glUniformMatrix4fv(RlocMVP,1,GL_FALSE,transformPipline.GetModelViewProjectionMatrix();glUniformMatrix4fv(RlocMV,1,GL_FALSE,transformPipline.GetModelViewMatrix();glUniformMatrix3fv(RlocNormal,1,GL_FALSE,transformPipline.GetNormalMatrix();glUniform1i(RlocTexture,0);glUniform4fv(RlocLight,1,vLightPos);glUniform4fv(RlocAmbient,1,vAmbient);glUniform4fv(RlocDiffuse,1,vDiffuse);glUniform4fv(RlocSpecular,1,vSpecular);glUniform1i(RlocLumicurve,2);floorBatch.Draw();modelViewMatrix.PushMatrix();modelViewMatrix.Rotate(stopWatch.GetElapsedSeconds()*10,0,1.0,0);glUniformMatrix4fv(RlocMVP,1,GL_FALSE,transformPipline.GetModelViewProjectionMatrix();glUniformMatrix4fv(RlocMV,1,GL_FALSE,transformPipline.GetModelViewMatrix();glUniformMatrix3fv(RlocNormal,1,GL_FALSE,transformPipline.GetNormalMatrix();glUniform1i(RlocTexture,1);sphereBatch.Draw();modelViewMatrix.PopMatrix();modelViewMatrix.PopMatrix();glBindFramebuffer(GL_DRAW_FRAMEBUFFER,0);glDrawBuffers(1,drawWindow);/这里就是开始从自定义缓冲区往外读取。glBindFramebuffer(GL_READ_FRAMEBUFFER,FBObj0);glViewport(0,0,screenWidth,screenHeight);glReadBuffer(GL_COLOR_ATTACHMENT2);glBlitFramebuffer(0,0,screenWidth*0.5,screenHeight,0,0,screenWidth*0.5,screenHeight,GL_COLOR_BUFFER_BIT,GL_NEAREST);glReadBuffer(GL_COLOR_ATTACHMENT1);glBlitFramebuffer(screenWidth*0.5,0,screenWidth,screenHeight,screenWidth*0.5,0,screenWidth,screenHeight,GL_COLOR_BUFFER_BIT,GL_NEAREST);glReadBuffer(GL_COLOR_ATTACHMENT0);glBlitFramebuffer(0,0,screenWidth,screenHeight,0.8*screenWidth,0.8*screenHeight,screenWidth,screenHeight,GL_COLOR_BUFFER_BIT,GL_NEAREST);glutSwapBuffers();glutPostRedisplay();void ChangeSize(int w,int h)if (h=0)h=1;glViewport(0,0,w,h);screenWidth=w;screenHeight=h;viewFrustum.SetPerspective(35.0f,float(w)/float(h),1.0,100.0);projectionMatrix.LoadMatrix(viewFrustum.GetProjectionMatrix();transformPipline.SetMatrixStacks(modelViewMatrix,projectionMatrix);/当屏幕大小改变时进行的处理。glBindFramebuffer(GL_DRAW_FRAMEBUFFER,FBObj0);glBindRenderbuffer(GL_RENDERBUFFER,depthBObj0);/现在才明白，绑定点是变量名称啊glRenderbufferStorage(GL_RENDERBUFFER,GL_DEPTH_COMPONENT32,screenWidth,screenHeight);glBindRenderbuffer(GL_RENDERBUFFER,colorBObj0);glRenderbufferStorage(GL_RENDERBUFFER,GL_RGB8,screenWidth,screenHeight);glBindRenderbuffer(GL_RENDERBUFFER,colorBObj1);glRenderbufferStorage(GL_RENDERBUFFER,GL_RGB8,screenWidth,screenHeight);glBindRenderbuffer(GL_RENDERBUFFER,colorBObj2);glRenderbufferStorage(GL_RENDERBUFFER,GL_RGB8,screenWidth,screenHeight);glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER,GL_DEPTH_ATTACHMENT,GL_RENDERBUFFER,depthBObj0);glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER,GL_COLOR_ATTACHMENT0,GL_RENDERBUFFER,colorBObj0);glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER,GL_COLOR_ATTACHMENT1,GL_RENDERBUFFER,colorBObj1);glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER,GL_COLOR_ATTACHMENT2,GL_RENDERBUFFER,colorBObj2);glBindFramebuffer(GL_DRAW_FRAMEBUFFER,0);gltCheckErrors();void ProcessKey(unsigned char key,int x,int y)if (key=f|key=F)uFBO=!uFBO;if (uFBO)std:cout应用了FBOstd:endl;if (key=a|key=A)glActiveTexture(GL_TEXTURE2);glBindTexture(GL_TEXTURE_BUFFER,texBOTexture0);glTexBuffer(GL_TEXTURE_BUFFER,GL_R32F,texBObj0);if (key=s|key=S)glActiveTexture(GL_TEXTURE2);glBindTexture(GL_TEXTURE_BUFFER,texBOTexture0);glTexBuffer(GL_TEXTURE_BUFFER,GL_R32F,texBObj1);if (key=d|key=D)glActiveTexture(GL_TEXTURE2);glBindTexture(GL_TEXTURE_BUFFER,texBOTexture0);glTexBuffer(GL_TEXTURE_BUFFER,GL_R32F,texBObj2);int _tmain(int argc, _TCHAR* argv)screenWidth=800;screenHeight=600;gltSetWorkingDirectory(argv0);glutInit(&argc,argv);glutInitDisplayMode(GLUT_DEPTH|GLUT_DOUBLE|GLUT_RGB|GLUT_STENCIL);glutInitWindowSize(screenWidth,screenHeight);glutCreateWindow(操作帧缓冲区);glutReshapeFunc(ChangeSize);glutDisplayFunc(RenderScene);glutKeyboardFunc(ProcessKey);glewInit();SetupRC();glutMainLoop();ShutdownRC();return 0;-fbo.vs-#version 130in vec4 vVertex;in vec3 vNormal;in vec2 vCoords;uniform mat4 mvMatrix;uniform mat4 pMatrix;uniform mat3 normalMatrix;uniform vec3 vLightPos;uniform vec4 vColor;out vec4 vFragColor;out vec2 vTexCoord;void main(void)vec3 vNorm = normalize(normalMatrix*vNormal);vec4 vEyePosition=vec4(mvMatrix*vVertex);vec3 vEyePosition3=normalize(vEyePosition.xyz);vec3 vLightDir=normalize(vLightPos-vEyePosition3);float nDotL=max(0.0,dot(vNorm ,vLightDir);vTexCoord=vCoords;vec4 colorGreen=vec4(0.0,1.0,0.8,1.0);vec3 tmpColor3=colorGreen.rgb*nDotL;vFragColor=vec4(tmpColor3,1.0);gl_Position=pMatrix*mvMatrix*vVertex;-fbo.fs-#version 130uniform sampler2D a_texture;uniform samplerBuffer lumCurveSampler;/locNormal=glGetUniformLocation(fboShader,normalMatrix);/locMV=glGetUniformLocation(fboShader,mvMatrix);/locMVP=glGetUniformLocation(fboShader,mvpMatrix);/locLight=glGetUniformLocation(fboShader,locLight);/locAmbient=glGetUniformLocation(fboShader,ambient);/locDiffuse=glGetUniformLocation(fboShader,diffuse);/locSpecular=glGetUniformLocation(fboShader,specular);uniform vec4 locLight;uniform vec4 ambient;uniform vec4 diffuse;uniform vec4 specular;in vec3 oNormal;in vec4 oPosition4;in vec2 oCoords;void main(void) vec4 priColor=texture2D(a_texture,oCoords); /首先咱们先把所有的光线计算出来。 vec3 vEyeLight=normalize(locLight.xyz-oPosition4.xyz); vec3 vEyeLight3=vEyeLight.xyz; float nDotL=max(dot(oNormal,vEyeLight3),0.0); priColor.xyz+=ambient.xyz; priColor.xyz+=(nDotL*diffuse.xyz); /然后计算发射光 vec3 vReflection=normalize(reflect(-vEyeLight3,oNormal); float spec=max(0.0,dot(oNormal,vReflection); if(nDotL != 0) float fSpec=pow(spec,128.0); priColor.rgb+=vec3(fSpec,fSpec,fSpec); /下面是测试版 gl_FragColor=priColor;-fboR.vs-#version 130/locNormal=glGetUniformLocation(fboShader,normalMatrix);/locMV=glGetUniformLocation(fboShader,mvMatrix);/locMVP=glGetUniformLocation(fboShader,mvpMatrix);/locLight=glGetUniformLocation(fboShader,locLight);/locAmbient=glGetUniformLocation(fboShader,ambient);/locDiffuse=glGetUniformLocation(fboShader,diffuse);/locSpecular=glGetUniformLocation(fboShader,specular);/GLT_ATTRIBUTE_VERTEX,vVertex,/GLT_ATTRIBUTE_TEXTURE0,vCoords,/GLT_ATTRIBUTE_NORMAL,vNormal);in vec4 vVertex;in vec2 vCoords;in vec3 vNormal;uniform mat4 mvpMatrix;uniform mat4 mvMatrix;uniform mat3 normalMatrix;out vec3 oNormal;out vec4 oPosition4;out vec2 oCoords;void main(void)oN