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unmultiply before blending

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itsmattkc
2019-03-10 13:02:27 +11:00
parent a2c714f80f
commit debdee8aa9
1 changed files with 9 additions and 4 deletions
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project/effectloaders.cpp
+9 -4
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@@ -381,10 +381,15 @@ void GenerateBlendingShader()
"void main() {\n"
" vec4 bg_color = texture2D(background, vTexCoord);\n" // Get background texture color
" vec4 fg_color = texture2D(foreground, vTexCoord);\n" // Get foreground texture color
" float true_opacity = opacity * fg_color.a;\n"
" vec3 blended_rgb = blend(bg_color.rgb, fg_color.rgb, true_opacity);\n" // Use switcher function above to blend RGBs
" vec4 composite = vec4(blended_rgb, bg_color.a + true_opacity);\n"
" gl_FragColor = composite;\n"
" if (fg_color.a > 0.0) {\n"
" float true_opacity = opacity * fg_color.a;\n"
" vec3 unmultipled_fg = max(vec3(0.0), min(vec3(1.0), fg_color.rgb / fg_color.a));\n"
" vec3 blended_rgb = blend(bg_color.rgb, unmultipled_fg, true_opacity);\n" // Use switcher function above to blend RGBs
" vec4 composite = vec4(blended_rgb, bg_color.a + true_opacity);\n"
" gl_FragColor = composite;\n"
" } else {\n"
" gl_FragColor = bg_color;\n"
" }\n"
"}\n");
}