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tex_env question

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Hi there, I'm using this on texture stage 3
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_EXT);
glTexEnvf(GL_TEXTURE_ENV, (GLenum)GL_COMBINE_RGB_EXT, GL_MODULATE );
glTexEnvf (GL_TEXTURE_ENV, (GLenum)GL_SOURCE0_RGB_EXT, GL_PRIMARY_COLOR);
glTexEnvf (GL_TEXTURE_ENV, (GLenum)GL_OPERAND0_RGB_EXT, GL_SRC_COLOR);
glTexEnvf (GL_TEXTURE_ENV, (GLenum)GL_SOURCE1_RGB_EXT, GL_PREVIOUS);
glTexEnvf (GL_TEXTURE_ENV, (GLenum)GL_OPERAND1_RGB_EXT, GL_SRC_COLOR);
This acutally means the value of the texture set for this stage isn't needed but when I do not bind a texture to this stage it is disabled completely and the computation isn't executed. Do I really have to set a texture for this stage (dummy texture)? Thanks Markus

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Yes, if you don't have a valid texture bound to the texture unit, the unit is effectively disabled, as required by the specification. Even if you don't use the texture, you must still have one bound to use it.

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