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Controlling the appearance of textures Using texture modes

Mode	Result color	Result transparency
REPLACE	Trgb	Ta
DECAL	Srgb*(1-Ta)+Trgb*Ta	Sa
MODULATE	Srgb*Trgb	Sa*Ta
BLEND	Srgb*(1-Trgb)+Brgb*Trgb	Sa*Ta

Where:

S_rgb is the color of the shape being texture mapped

S_a is the alpha of the shape being texture mapped

T_rgb is the texture pixel color

T_a is the texture pixel alpha

B_rgb is the shape blend color

B_a is the shape blend alpha