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rendering texture to FBO Stencil using EXT_packed_depth_stencil


Hi

Hi I'm drawing a textured quad into to the stencil buffer, the problem is when we later test against the buffer all fragments fail

If we draw a white quad instead, the stencils tests work as expected

I'm working inside an FBO, to which we've attached 24-bit depth / 8- bit stencil texture using EXT_packed_depth_stencil

I'm new to GL_STENCIL_TEST, is it feasible to draw a texture to the stencil buffer like this?

code below

Cheers

Nick


/* create an 24-bit depth + 8-bit stencil texture */
glGenTextures(1, &_glstencil[index]);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB, _glstencil[index]);
glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_DEPTH24_STENCIL8_EXT, width, height, 0, GL_DEPTH_STENCIL_EXT, GL_UNSIGNED_INT_24_8_EXT, NULL);

/* bind depth + stencil to fbo */
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_TEXTURE_RECTANGLE_ARB , _glstencil [index], 0);
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_STENCIL_ATTACHMENT_EXT, GL_TEXTURE_RECTANGLE_ARB , _glstencil [index], 0);
glCheckFBO();


...


glClear(GL_STENCIL_BUFFER_BIT);
glClearStencil(0.0f);
glEnable(GL_STENCIL_TEST);
glStencilFunc(GL_NEVER, 0x0, 0x0);
glStencilOp(GL_INCR, GL_INCR, GL_INCR);

// works
glColor4f(1, 1, 1, 1);
glBegin(GL_QUADS);
glVertex2f(minX+200, minY+200);			
glVertex2f(maxX-200, minY+200);			
glVertex2f(maxX-200, maxY-200);			
glVertex2f(minX+200, maxY-200);	
glEnd();

// fails ///////////////////////////////////////////////
glEnable(GL_TEXTURE_RECTANGLE_ARB);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB, stencil);
glBegin(GL_QUADS);		
glTexCoord2f(minX, minY);		
glVertex2f(minX, minY);				
glTexCoord2f(maxX, minY);			
glVertex2f(maxX, minY);			
glTexCoord2f(maxX, maxY);			
glVertex2f(maxX, maxY);		
glTexCoord2f(minX, maxY);		
glVertex2f(minX, maxY);			
glEnd();
///////////////////////////////////////////////////////

glStencilFunc(GL_NOTEQUAL, 0x1, 0x1);
glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);

glEnable(GL_TEXTURE_RECTANGLE_ARB);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB, texture);
glBegin(GL_QUADS);		
glTexCoord2f(minX, minY);		
glVertex2f(minX, minY);				
glTexCoord2f(maxX, minY);			
glVertex2f(maxX, minY);			
glTexCoord2f(maxX, maxY);			
glVertex2f(maxX, maxY);		
glTexCoord2f(minX, maxY);		
glVertex2f(minX, maxY);			
glEnd();

glDisable(GL_TEXTURE_RECTANGLE_ARB);
glDisable(GL_STENCIL_TEST);
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