B3D brush and texture blend modes (GL equivalents)

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Vertex
 #1
Hi!
Dot3:
' glActiveTexture GL_TEXTURE0+Layer
' glBindTexture GL_TEXTURE_2D, MyNormalMap
glTexEnvf GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_EXT
glTexEnvf GL_TEXTURE_ENV, GL_COMBINE_RGB_EXT, GL_DOT3_RGB_EXT

Add:
glTexEnvf GL_TEXTURE_ENV, GL_COMBINE_RGB_EXT, GL_ADD

Modulate:
glTexEnvf GL_TEXTURE_ENV, GL_COMBINE_RGB_EXT, GL_MODULATE

One texture:
glTexEnvf GL_TEXTURE_ENV, GL_COMBINE_RGB_EXT, GL_REPLACE

cu olli