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glTexSubImage2D problems

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the following code is used to draw a black transparent square hole into a 2d (to simulate bits of level getting blown up!). the problem is: the level remains unchanged
//vars: l, r, t, b (left, right, top, bottom) are long''s and are definately within the bounds of the texture

unsigned char* pixel = NULL;

	for(int x=l; x<r; ++x)
		for(int y=t; y<b; ++y)
			pixel = &m_image->Bytes[(y*m_image->Width*m_image->BytesPerPixel) + (x*m_image->BytesPerPixel)];

			*(pixel+0) = 0;
			*(pixel+1) = 0;
			*(pixel+2) = 0;
			*(pixel+3) = 0;

	glBindTexture(GL_TEXTURE_2D, m_maintexture);	
	glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, m_image->Width, m_image->Height, GL_RGBA, GL_UNSIGNED_BYTE, m_image->Bytes);
	//gluBuild2DMipmaps(GL_TEXTURE_2D, GL_RGBA, m_image->Width, m_image->Height, GL_BGRA_EXT, GL_UNSIGNED_BYTE, m_image->Bytes);

if i use the commented gluBuild2DMipMaps line instead of texsubimage, it works (but is slooooow) which verifies the validity of m_image. im not concerned with any optimisations for now - just getting it working at a decent speed (ie not using build2dmips func).

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Guest Anonymous Poster
You do not have width and height the power of two in glTexSubImage2D so that does not verify the validity of m_image.

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no need to be powers of 2
ill say you''re doing someit wrong with the pointers
are both textures RGBA ones?


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