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karx11erx

render 2 tex with framebuffers results in black texture

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I have built rendering to texture using framebuffers and renderbuffers into my application, but I always get a black texture from rendering to the framebuffer. Any idea what I might be doing wrong (need code)?
//Initialization

int ogl_create_fbuffer (ogl_fbuffer *fb, int nWidth, int nHeight)
{
if (!bRender2TextureOk)
	return 0;
glGenFramebuffersEXT (1, &fb->hBuf);
glGenTextures (1, &fb->texId);
glGenRenderbuffersEXT (1, &fb->hDepthRb);
glBindFramebufferEXT (GL_FRAMEBUFFER_EXT, fb->hBuf);
glBindTexture (GL_TEXTURE_2D, fb->texId);
if (nWidth > 0)
	fb->nWidth = nWidth;
if (nHeight > 0)
	fb->nHeight = nHeight;
#if 1
glTexImage2D (GL_TEXTURE_2D, 0, GL_RGB8, fb->nWidth, fb->nHeight, 0, GL_RGB, GL_INT, NULL);
#else
glTexImage2D (GL_TEXTURE_2D, 0, GL_RGBA8, fb->nWidth, fb->nHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
#endif
glGenerateMipmapEXT (GL_TEXTURE_2D);
glFramebufferTexture2DEXT (GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, fb->texId, 0);
glBindRenderbufferEXT (GL_RENDERBUFFER_EXT, fb->hDepthRb);
glRenderbufferStorageEXT (GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT24, fb->nWidth, fb->nHeight);
glFramebufferRenderbufferEXT (GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, fb->hDepthRb);
if (ogl_fbuffer_avail (fb) < 0)
	return fb->nStatus;
glFramebufferTexture2DEXT (GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, fb->texId, 0);
glFramebufferRenderbufferEXT (GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, fb->hDepthRb);
glBindFramebufferEXT (GL_FRAMEBUFFER_EXT, 0);
return 1;
}

// turn framebuffer on

int ogl_enable_fbuffer (ogl_fbuffer *fb)
{
glBindTexture (GL_TEXTURE_2D, 0);
glBindFramebufferEXT (GL_FRAMEBUFFER_EXT, fb->hBuf);
//glDrawBuffer (GL_FRONT);
//glReadBuffer (GL_FRONT);
return 1;
}

// turn framebuffer off
glBindFramebufferEXT (GL_FRAMEBUFFER_EXT, 0);
glBindTexture (GL_TEXTURE_2D, fb->texId);



Before rendering to the framebuffer, it is turned on. Then, the app is calling its regular rendering routine. After that, the framebuffer is turned off. Before rendering the framebuffer texture, it is bound by calling glBindTexture (GL_TEXTURE_2D, tex->fbuffer.texId); [Edited by - karx11erx on December 16, 2005 5:09:02 PM]

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