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add premultiplied alpha blend mode (#2342)

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megagrump 2022-02-13 18:42:24 +01:00 • committed by GitHub
parent 4bc6e0d7de
commit f40eed5adf
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 7 additions and 4 deletions
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1
src/raylib.h
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@ -839,6 +839,7 @@ typedef enum {
BLEND_MULTIPLIED, // Blend textures multiplying colors
BLEND_ADD_COLORS, // Blend textures adding colors (alternative)
BLEND_SUBTRACT_COLORS, // Blend textures subtracting colors (alternative)
BLEND_ALPHA_PREMUL, // Blend premultiplied textures considering alpha
BLEND_CUSTOM // Blend textures using custom src/dst factors (use rlSetBlendMode())
} BlendMode;

2
src/rlgl.h
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@ -433,6 +433,7 @@ typedef enum {
RL_BLEND_MULTIPLIED, // Blend textures multiplying colors
RL_BLEND_ADD_COLORS, // Blend textures adding colors (alternative)
RL_BLEND_SUBTRACT_COLORS, // Blend textures subtracting colors (alternative)
RL_BLEND_ALPHA_PREMUL, // Blend premultiplied textures considering alpha
RL_BLEND_CUSTOM // Blend textures using custom src/dst factors (use rlSetBlendFactors())
} rlBlendMode;
@ -1778,6 +1779,7 @@ void rlSetBlendMode(int mode)
case RL_BLEND_MULTIPLIED: glBlendFunc(GL_DST_COLOR, GL_ONE_MINUS_SRC_ALPHA); glBlendEquation(GL_FUNC_ADD); break;
case RL_BLEND_ADD_COLORS: glBlendFunc(GL_ONE, GL_ONE); glBlendEquation(GL_FUNC_ADD); break;
case RL_BLEND_SUBTRACT_COLORS: glBlendFunc(GL_ONE, GL_ONE); glBlendEquation(GL_FUNC_SUBTRACT); break;
case RL_BLEND_ALPHA_PREMUL: glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA); glBlendEquation(GL_FUNC_ADD); break;
case RL_BLEND_CUSTOM:
{
// NOTE: Using GL blend src/dst factors and GL equation configured with rlSetBlendFactors()