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masking blend modes

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Glenn Maynard
2007-02-25 00:32:39 +00:00
parent 512021c127
commit c072f6e98b
3 changed files with 36 additions and 0 deletions
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stepmania/src/RageDisplay_OGL.cpp
+8
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@@ -1637,6 +1637,14 @@ void RageDisplay_OGL::SetBlendMode( BlendMode mode )
iSourceRGB = GL_ONE; iDestRGB = GL_ZERO;
iSourceAlpha = GL_ONE; iDestAlpha = GL_ZERO;
break;
case BLEND_ALPHA_MASK:
iSourceRGB = GL_ZERO; iDestRGB = GL_ONE;
iSourceAlpha = GL_ZERO; iDestAlpha = GL_SRC_ALPHA;
break;
case BLEND_ALPHA_KNOCK_OUT:
iSourceRGB = GL_ZERO; iDestRGB = GL_ONE;
iSourceAlpha = GL_ZERO; iDestAlpha = GL_ONE_MINUS_SRC_ALPHA;
break;
case BLEND_WEIGHTED_MULTIPLY:
/* output = 2*(dst*src). 0.5,0.5,0.5 is identity; darker colors darken the image,
* and brighter colors lighten the image. */