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graphicsdriver: Optimize shaders

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Simplified the case when a color matrix is not used.
This commit is contained in:
Hajime Hoshi
2019-02-16 23:30:14 +09:00
parent 1c3113e763
commit 3ecb00f717
2 changed files with 14 additions and 9 deletions
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10
internal/graphicsdriver/opengl/shader.go
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@@ -256,19 +256,21 @@ void main(void) {
color = mix(mix(c0, c1, rate.x), mix(c2, c3, rate.x), rate.y);
#endif
#if defined(USE_COLOR_MATRIX)
// Un-premultiply alpha.
// When the alpha is 0, 1.0 - sign(alpha) is 1.0, which means division does nothing.
color.rgb /= color.a + (1.0 - sign(color.a));
#if defined(USE_COLOR_MATRIX)
// Apply the color matrix or scale.
color = (color_matrix_body * color) + color_matrix_translation;
#endif
color *= varying_color_scale;
color = clamp(color, 0.0, 1.0);
// Premultiply alpha
color.rgb *= color.a;
#else
vec4 s = varying_color_scale;
color *= vec4(s.r, s.g, s.b, 1.0) * s.a;
color = clamp(color, 0.0, color.a);
#endif
gl_FragColor = color;
}