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Texture matrix

Started by BloodLust666 Feb 1, 2008 at 1:10 AM 1 replies 600+ views

Original Post

Feb 1, 2008 at 1:10 AM

I think there may be something wrong with the way i'm doing my texture matrix... The code below is how i'm doing things. By the way, i'm using VBO's, don't know if that matters or not.



glActiveTexture(GL_TEXTURE0);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);

glMatrixMode(GL_TEXTURE);
glLoadIdentity();

glRotatef(-W_toDegrees(m_fOrientation),0.0f,0.0f,1.0f);
glScalef(m_v2UVtile.X, m_v2UVtile.Y, 1.0f);

glBindTexture(GL_TEXTURE_2D, m_pMap->_GetGLTextureID());

// ... render VBO

Even when I have texture that is to be rotating (inc the m_fOrientation), nothing moves, no spinning, no nothing...

Vilem Otte

Feb 1, 2008 at 4:49 AM

Well, as far as I know, you need to set matrix mode on modelview matrix after rotating and scaling texture coordinates. And if you are not using shaders, than you need to enable texture, so it'd look like:

// Active texel unit = zeroglActiveTexture(GL_TEXTURE0);// Enable texturingglEnable(GL_TEXTURE_2D);// Bind texture mapglBindTexture(GL_TEXTURE_2D, m_pMap->_GetGLTextureID());// Dunno why are u modulating texture, try replacing it:glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);// Texture matrixglMatrixMode(GL_TEXTURE);// Load identity matrixglLoadIdentity();// Rotate your texture matrixglRotatef(-W_toDegrees(m_fOrientation),0.0f,0.0f,1.0f);// Scale your texture matrixglScalef(m_v2UVtile.X, m_v2UVtile.Y, 1.0f);// Switch back to modelview matrixglMatrixMode(GL_MODELVIEW);// ... render VBO

This should work, well i presume u haven't some issues in rest of the code.

BloodLust666

Feb 1, 2008 at 10:52 AM

cool thanks, i'll try that out; but what about if I am using shaders? I'm actually in the process of refactoring how my rendering works so I can incorporate shaders.

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