FBO读数据

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m_pFBO->Bind();

glReadBuffer(GL_COLOR_ATTACHMENT0_EXT);
glReadPixels(x, y, 1, 1,GL_RGB,GL_FLOAT,resultStartPos);

glReadBuffer(GL_COLOR_ATTACHMENT1_EXT);
glReadPixels(x, y, 1, 1,GL_RGB,GL_FLOAT,resultEndPos);

FramebufferObject::Disable();

imdebugTexImagef(GL_TEXTURE_RECTANGLE_ARB, m_endPosTextureIdx, GL_RGB);
imdebugTexImagef(GL_TEXTURE_RECTANGLE_ARB, m_startPosTextureIdx, GL_RGB);

int pos=(y * m_winWidth + x )*3;//(x*m_winHeight+y)*4;
printf("----------------------------------------------\n");
printf("resultStartPos...%f %f %f\n",resultStartPos[0],resultStartPos[1],resultStartPos[2]);
printf("resultEndPos.....%f %f %f \n",resultEndPos[0],resultEndPos[1],resultEndPos[2]);