Does anyone know if there are any issues when using multitexturing on a pbuffer?
Right now, I have written a tile engine and using register combiners to create a dynamic lightmap for the scene. I think I have set everything up correctly.
wglMakeCurrent( hdc_pbuffer, rc_pbuffer );
// Set up an ortho projection
glMatrixMode( GL_PROJECTION );
gluOrtho2D( 0, 512, 0, 512 );
// I have disabled stage 1 and got rid of
// the texture combiners already to narrow
// down the problem
glActiveTextureARB( GL_TEXTURE0_ARB );
glEnable( GL_TEXTURE_2D );
glBindTexture( GL_TEXTURE_2D, normalmap );
glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE );
glActiveTextureARB( GL_TEXTURE1_ARB );
glDisable( GL_TEXTURE_2D );
glDisable( GL_BLEND );
glDisable( GL_LIGHTING );
glDisable( GL_COLOR_MATERIAL );
// Draw the texture to the pbuffer
glColor4f( 1.f, 0.f, 0.f, 1.f );
glBegin( GL_QUADS );
glTexCoord2i( 0, 0 );
glVertex3i( 0, 0, 0 );
glTexCoord2i( 1, 0 );
glVertex3i( 100, 0, 0 );
glTexCoord2i( 1, 1 );
glVertex3i( 100, 100, 0 );
glTexCoord2i( 0, 1 );
glVertex3i( 0, 100, 0 );
//glFlush( ); // Makes no difference if used
wglMakeCurrent( hdc_window, rc_window );
Now what I do to test is to just draw a textured quad of the pbuffer to screen. This works fine so I won't bother posting the code.
However, the actual contents of the pbuffer is not what I expected. First of all, the quad I draw in the code above is not textured (it should be because I enabled texturing on stage 0). It IS colored (it should NOT be because I disabled COLOR_MATERIAL). Everything else works fine. It's just the texturing that has me stumped.
And fyi, the code above definitely works on the screen (i.e., if I comment out 'wglMakeCurrent( hdc_pbuffer, rc_pbuffer )', it will draw directly to the screen - and the texturing works fine like that).
This leads me to suspect that there is an issue with multitexturing on pbuffers. Another possibility is that I need to set up the pbuffer slightly differently to allow for multitexturing.
Does anyone have any ideas?