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Add premultiplied blending

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This commit is contained in:
Bart van Strien
2011-10-06 15:17:21 +02:00
parent ff284e74e4
commit bee9d49515
3 changed files with 9 additions and 1 deletions
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src/modules/graphics/Graphics.cpp
+1
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@@ -121,6 +121,7 @@ namespace graphics
{ "additive", Graphics::BLEND_ADDITIVE },
{ "subtractive", Graphics::BLEND_SUBTRACTIVE },
{ "multiplicative", Graphics::BLEND_MULTIPLICATIVE },
{ "premultiplied", Graphics::BLEND_PREMULTIPLIED },
};
StringMap<Graphics::BlendMode, Graphics::BLEND_MAX_ENUM> Graphics::blendModes(Graphics::blendModeEntries, sizeof(Graphics::blendModeEntries));
src/modules/graphics/Graphics.h
+1
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@@ -54,6 +54,7 @@ namespace graphics
BLEND_ADDITIVE,
BLEND_SUBTRACTIVE,
BLEND_MULTIPLICATIVE,
BLEND_PREMULTIPLIED,
BLEND_MAX_ENUM
};
src/modules/graphics/opengl/Graphics.cpp
+7 -1
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@@ -659,6 +659,8 @@ namespace opengl
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
else if (mode == BLEND_MULTIPLICATIVE)
glBlendFunc(GL_DST_COLOR, GL_ONE_MINUS_SRC_ALPHA);
else if (mode == BLEND_PREMULTIPLIED)
glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
else // mode == BLEND_ADDITIVE || mode == BLEND_SUBTRACTIVE
glBlendFunc(GL_SRC_ALPHA, GL_ONE);
}
@@ -684,8 +686,12 @@ namespace opengl
return BLEND_ADDITIVE;
else if (src == GL_SRC_ALPHA && dst == GL_ONE_MINUS_SRC_ALPHA) // && equation == GL_FUNC_ADD
return BLEND_ALPHA;
else // src == GL_DST_COLOR && dst == GL_ONE_MINUS_SRC_ALPHA && equation == GL_FUNC_ADD
else if (src == GL_DST_COLOR && dst == GL_ONE_MINUS_SRC_ALPHA) // && equation == GL_FUNC_ADD
return BLEND_MULTIPLICATIVE;
else if (src == GL_ONE && dst == GL_ONE_MINUS_SRC_ALPHA) // && equation == GL_FUNC_ADD
return BLEND_PREMULTIPLIED;
return BLEND_MAX_ENUM; // Should never be reached.
}
Graphics::ColorMode Graphics::getColorMode()