About MRT

**Cgor_Cyrosly** · 10-30-2007, 04:26 AM

HI,everyone
I want to use Cg and FBO for MRT,but I dont know how to use the api function :glFramebufferTextureLayerEXT and glFramebufferTextureFaceEXT

As this(which is right?):

Code :

int layer=0;
glFramebufferTextureLayerEXT(GL_FRAMEBUFFER_EXT,attachment,colorTex,0,layer++);
glFramebufferTextureLayerEXT(GL_FRAMEBUFFER_EXT,attachment,colorTex,0,layer++);
glFramebufferTextureLayerEXT(GL_FRAMEBUFFER_EXT,attachment,colorTex,0,layer++);
glFramebufferTextureLayerEXT(GL_FRAMEBUFFER_EXT,attachment,colorTex,0,layer++);
glFramebufferTextureLayerEXT(GL_FRAMEBUFFER_EXT,attachment,colorTex,0,layer++);
glFramebufferTextureLayerEXT(GL_FRAMEBUFFER_EXT,attachment,colorTex,0,layer++);
glFramebufferTextureLayerEXT(GL_FRAMEBUFFER_EXT,attachment,colorTex,0,layer++);
glFramebufferTextureLayerEXT(GL_FRAMEBUFFER_EXT,attachment,colorTex,0,layer++);
//same attachment

or

glFramebufferTextureLayerEXT(GL_FRAMEBUFFER_EXT, attachment[0] ,colorTex,0,layer++);
glFramebufferTextureLayerEXT(GL_FRAMEBUFFER_EXT, attachment[1] ,colorTex,0,layer++);
glFramebufferTextureLayerEXT(GL_FRAMEBUFFER_EXT, attachment[2] ,colorTex,0,layer++);
glFramebufferTextureLayerEXT(GL_FRAMEBUFFER_EXT, attachment[3] ,colorTex,0,layer++);
glFramebufferTextureLayerEXT(GL_FRAMEBUFFER_EXT, attachment[4] ,colorTex,0,layer++);
glFramebufferTextureLayerEXT(GL_FRAMEBUFFER_EXT, attachment[5] ,colorTex,0,layer++);
glFramebufferTextureLayerEXT(GL_FRAMEBUFFER_EXT, attachment[6] ,colorTex,0,layer++);
glFramebufferTextureLayerEXT(GL_FRAMEBUFFER_EXT, attachment[7] ,colorTex,0,layer++);
//different attachments
glDrawBuffers(8,attachment);

Code :

glFramebufferTextureFaceEXT(GL_FRAMEBUFFER_EXT,attachment,0,0);
glFramebufferTextureFaceEXT(GL_FRAMEBUFFER_EXT,attachment,0,1);
glFramebufferTextureFaceEXT(GL_FRAMEBUFFER_EXT,attachment,0,2)
glFramebufferTextureFaceEXT(GL_FRAMEBUFFER_EXT,attachment,0,3);
glFramebufferTextureFaceEXT(GL_FRAMEBUFFER_EXT,attachment,0,4);
glFramebufferTextureFaceEXT(GL_FRAMEBUFFER_EXT,attachment,0,5);

or

Code :

glFramebufferTextureFaceEXT(GL_FRAMEBUFFER_EXT,attachment[0],0,0);
glFramebufferTextureFaceEXT(GL_FRAMEBUFFER_EXT,attachment[1],0,1);
glFramebufferTextureFaceEXT(GL_FRAMEBUFFER_EXT,attachment[2],0,2)
glFramebufferTextureFaceEXT(GL_FRAMEBUFFER_EXT,attachment[3],0,3);
glFramebufferTextureFaceEXT(GL_FRAMEBUFFER_EXT,attachment[4],0,4);
glFramebufferTextureFaceEXT(GL_FRAMEBUFFER_EXT,attachment[5],0,5);

I`s another question:when use the ping-pang technology with FBO,I changed the renderering target in the next pass of the loop used:

I setted the FBO before the loop

Code :

    glBindFramebufferEXT(GL_FRAMEBUFFER_EXT,fboIdx); 
    //used glFramebufferTexture2DEXT for testing again(and as the same result)
    glFramebufferTextureEXT(GL_FRAMEBUFFER_EXT,COLOR[dst][0],colorTexIdx[dst][0],0);
    glFramebufferTextureEXT(GL_FRAMEBUFFER_EXT,COLOR[dst][1],colorTexIdx[dst][1],0);
    glFramebufferTextureEXT(GL_FRAMEBUFFER_EXT,COLOR[dst][2],colorTexIdx[dst][2],0);
    glFramebufferTextureEXT(GL_FRAMEBUFFER_EXT,COLOR[dst][3],colorTexIdx[dst][3],0);
    glFramebufferTextureEXT(GL_FRAMEBUFFER_EXT,COLOR[dst][4],colorTexIdx[dst][4],0);
    glFramebufferTextureEXT(GL_FRAMEBUFFER_EXT,COLOR[dst][5],colorTexIdx[dst][5],0);
    glFramebufferTextureEXT(GL_FRAMEBUFFER_EXT,COLOR[dst][6],colorTexIdx[dst][6],0);
    glFramebufferTextureEXT(GL_FRAMEBUFFER_EXT,COLOR[dst][7],colorTexIdx[dst][7],0);   
    glFramebufferTextureEXT(GL_FRAMEBUFFER_EXT,COLOR[src][0],colorTexIdx[src][0],0);
    glFramebufferTextureEXT(GL_FRAMEBUFFER_EXT,COLOR[src][1],colorTexIdx[src][1],0);
    glFramebufferTextureEXT(GL_FRAMEBUFFER_EXT,COLOR[src][2],colorTexIdx[src][2],0);
    glFramebufferTextureEXT(GL_FRAMEBUFFER_EXT,COLOR[src][3],colorTexIdx[src][3],0);
    glFramebufferTextureEXT(GL_FRAMEBUFFER_EXT,COLOR[src][4],colorTexIdx[src][4],0);
    glFramebufferTextureEXT(GL_FRAMEBUFFER_EXT,COLOR[src][5],colorTexIdx[src][5],0);
    glFramebufferTextureEXT(GL_FRAMEBUFFER_EXT,COLOR[src][6],colorTexIdx[src][6],0);
    glFramebufferTextureEXT(GL_FRAMEBUFFER_EXT,COLOR[src][7],colorTexIdx[src][7],0);
    transferSourceTexture(); 
    CHECK_FRAMEBUFFER_STATUS();

Code :

    for(int s=0;s<loopDepth;s++){ 
        glDrawBuffers(8,COLOR[dst]); 
        glActiveTexture(GL_TEXTURE0);
        glBindTexture(GL_TEXTURE_2D,colorTexIdx[src][0]);
        glUniform1i(samplerLoc[0],0);
        glFinish();
        glActiveTexture(GL_TEXTURE1);
        glBindTexture(GL_TEXTURE_2D,colorTexIdx[src][1]);
        glUniform1i(samplerLoc[1],1);
        glFinish();
        glActiveTexture(GL_TEXTURE2);
        glBindTexture(GL_TEXTURE_2D,colorTexIdx[src][2]);
        glUniform1i(samplerLoc[2],2);
        glFinish();
        glActiveTexture(GL_TEXTURE3);
        glBindTexture(GL_TEXTURE_2D,colorTexIdx[src][3]);
        glUniform1i(samplerLoc[3],3);
        glActiveTexture(GL_TEXTURE4);
        glBindTexture(GL_TEXTURE_2D,colorTexIdx[src][4]);
        glUniform1i(samplerLoc[4],4);
        glFinish();
        glActiveTexture(GL_TEXTURE5);
        glBindTexture(GL_TEXTURE_2D,colorTexIdx[src][5]);
        glUniform1i(samplerLoc[5],5);
        glFinish();
        glActiveTexture(GL_TEXTURE6);
        glBindTexture(GL_TEXTURE_2D,colorTexIdx[src][6]);
        glUniform1i(samplerLoc[6],6);
        glFinish();
        glActiveTexture(GL_TEXTURE7);
        glBindTexture(GL_TEXTURE_2D,colorTexIdx[src][7]);
        glUniform1i(samplerLoc[7],7);
        glFinish();	 
        glBegin(GL_QUADS);
          glMultiTexCoord2f(GL_TEXTURE0,.0   ,.0   );
          glMultiTexCoord2f(GL_TEXTURE1,.0   ,.0   );
          glMultiTexCoord2f(GL_TEXTURE2,.0   ,.0   );
          glMultiTexCoord2f(GL_TEXTURE3,.0   ,.0   );
          glMultiTexCoord2f(GL_TEXTURE4,.0   ,.0   );
          glMultiTexCoord2f(GL_TEXTURE5,.0   ,.0   );
          glMultiTexCoord2f(GL_TEXTURE6,.0   ,.0   );
          glMultiTexCoord2f(GL_TEXTURE7,.0   ,.0   );
          glVertex2f(.0   ,.0   );
          glMultiTexCoord2f(GL_TEXTURE0,sizeX,.0   );
          glMultiTexCoord2f(GL_TEXTURE1,sizeX,.0   );
          glMultiTexCoord2f(GL_TEXTURE2,sizeX,.0   );
          glMultiTexCoord2f(GL_TEXTURE3,sizeX,.0   );
          glMultiTexCoord2f(GL_TEXTURE4,sizeX,.0   );
          glMultiTexCoord2f(GL_TEXTURE5,sizeX,.0   );
          glMultiTexCoord2f(GL_TEXTURE6,sizeX,.0   );
          glMultiTexCoord2f(GL_TEXTURE7,sizeX,.0   );
          glVertex2f(sizeX,.0   );
          glMultiTexCoord2f(GL_TEXTURE0,sizeX,sizeY);
          glMultiTexCoord2f(GL_TEXTURE1,sizeX,sizeY);
          glMultiTexCoord2f(GL_TEXTURE2,sizeX,sizeY);
          glMultiTexCoord2f(GL_TEXTURE3,sizeX,sizeY);
          glMultiTexCoord2f(GL_TEXTURE4,sizeX,sizeY);
          glMultiTexCoord2f(GL_TEXTURE5,sizeX,sizeY);
          glMultiTexCoord2f(GL_TEXTURE6,sizeX,sizeY);
          glMultiTexCoord2f(GL_TEXTURE7,sizeX,sizeY);
          glVertex2f(sizeX,sizeY);
          glMultiTexCoord2f(GL_TEXTURE0,.0   ,sizeY);
          glMultiTexCoord2f(GL_TEXTURE1,.0   ,sizeY);
          glMultiTexCoord2f(GL_TEXTURE2,.0   ,sizeY);
          glMultiTexCoord2f(GL_TEXTURE3,.0   ,sizeY);
          glMultiTexCoord2f(GL_TEXTURE4,.0   ,sizeY);
          glMultiTexCoord2f(GL_TEXTURE5,.0   ,sizeY);
          glMultiTexCoord2f(GL_TEXTURE6,.0   ,sizeY);
          glMultiTexCoord2f(GL_TEXTURE7,.0   ,sizeY);
          glVertex2f(.0   ,sizeY);
        glEnd();      
        glFinish();
        dst^=src;
        src^=dst;
        dst^=src; 
}

why not effect only the first pass of loop
thanks!

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