M2/Rendering
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Blending Modes
Wrath of the Lich King and Cataclysm do not use separate alpha blending. Later expansion clients likely do use separate alpha blending.
Blend_BlendAdd was added after Cataclysm.
| Mode | Blending Enabled | Src Color | Dest Color | Src Alpha | Dest Alpha | |
|---|---|---|---|---|---|---|
| 0 | Blend_Opaque | Disabled | ONE | ZERO | ONE | ZERO |
| 1 | Blend_AlphaKey | Disabled | ONE | ZERO | ONE | ZERO |
| 2 | Blend_Alpha | Enabled | SRC_ALPHA | ONE_MINUS_SRC_ALPHA | ONE | ONE_MINUS_SRC_ALPHA |
| 3 | Blend_Add | Enabled | SRC_ALPHA | ONE | ZERO | ONE |
| 4 | Blend_Mod | Enabled | DST_COLOR | ZERO | ? | ZERO |
| 5 | Blend_Mod2x | Enabled | DST_COLOR | SRC_COLOR | ? | SRC_ALPHA |
| 6 | Blend_ModAdd | Enabled | DST_COLOR | ONE | ? | ONE |
| 7 | Blend_InvSrcAlphaAdd | Enabled | ONE_MINUS_SRC_ALPHA | ONE | ONE_MINUS_SRC_ALPHA | ONE |
| 8 | Blend_InvSrcAlphaOpaque | Enabled | ONE_MINUS_SRC_ALPHA | ZERO | ONE_MINUS_SRC_ALPHA | ZERO |
| 9 | Blend_SrcAlphaOpaque | Enabled | SRC_ALPHA | ZERO | - | - |
| 10 | Blend_NoAlphaAdd | Enabled | ONE | ONE | - | - |
| 11 | Blend_ConstantAlpha | Enabled | CONSTANT_ALPHA | ONE_MINUS_CONSTANT_ALPHA | - | - |
| 12 | Blend_Screen | Enabled | ONE_MINUS_DST_COLOR | ONE | - | - |
| 13 | Blend_BlendAdd | Enabled | ONE | ONE_MINUS_SRC_ALPHA | - | - |