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Merge pull request #1124 from absolutelynothelix/premultiply-shadow-color

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Yuxuan Shui
2023-12-16 17:27:22 +00:00
committed by GitHub
parent a6b4e285f8 e07b1d7a12
commit 8b7c3ffb8b
1 changed files with 5 additions and 2 deletions
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7
src/backend/gl/gl_common.c
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@@ -1347,8 +1347,11 @@ void *gl_shadow_from_mask(backend_t *base, void *mask,
glBindTexture(GL_TEXTURE_2D, tmp_texture);
glUseProgram(gd->shadow_shader.prog);
glUniform4f(gd->shadow_shader.uniform_color, (GLfloat)color.red,
(GLfloat)color.green, (GLfloat)color.blue, (GLfloat)color.alpha);
// The shadow color is converted to the premultiplied format to respect the
// globally set glBlendFunc and thus get the correct and expected result.
glUniform4f(gd->shadow_shader.uniform_color, (GLfloat)(color.red * color.alpha),
(GLfloat)(color.green * color.alpha),
(GLfloat)(color.blue * color.alpha), (GLfloat)color.alpha);
// clang-format off
GLuint indices[] = {0, 1, 2, 2, 3, 0};