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graphicsdriver/opengl: Fix comments

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This commit is contained in:
Hajime Hoshi 2020-06-25 01:06:30 +09:00
parent 2a63512c6e
commit d3613e13af
1 changed files with 7 additions and 6 deletions
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13
internal/graphicsdriver/opengl/defaultshader.go
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@ -200,7 +200,7 @@ void main(void) {
color = vec4(0, 0, 0, 0);
}
# endif // defined(ADDRESS_UNSAFE)
#endif
#endif // defined(FILTER_NEAREST)
#if defined(FILTER_LINEAR)
vec4 color;
@ -241,7 +241,7 @@ void main(void) {
vec2 rate = fract(p0 * source_size);
color = mix(mix(c0, c1, rate.x), mix(c2, c3, rate.x), rate.y);
#endif
#endif // defined(FILTER_LINEAR)
#if defined(FILTER_SCREEN)
highp vec2 texel_size = 1.0 / source_size;
@ -259,11 +259,12 @@ void main(void) {
vec2 rate_center = vec2(1.0, 1.0) - half_scaled_texel_size;
vec2 rate = clamp(((fract(p0 * source_size) - rate_center) * scale) + rate_center, 0.0, 1.0);
gl_FragColor = mix(mix(c0, c1, rate.x), mix(c2, c3, rate.x), rate.y);
// Assume that a color matrix and color vector values are not used with FILTER_SCREEN.
#else
#if defined(USE_COLOR_MATRIX)
# 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));
@ -272,16 +273,16 @@ void main(void) {
color *= varying_color_scale;
// Premultiply alpha
color.rgb *= color.a;
#else
# else
vec4 s = varying_color_scale;
color *= vec4(s.r, s.g, s.b, 1.0) * s.a;
#endif
# endif // defined(USE_COLOR_MATRIX)
color = min(color, color.a);
gl_FragColor = color;
#endif
#endif // defined(FILTER_SCREEN)
}
`