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Clean up glsl code

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This commit is contained in:
Emil Ernerfeldt 2021-11-13 13:09:08 +01:00
parent b5cb2b2c0d
commit 105cb57050
13 changed files with 219 additions and 219 deletions
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21
egui_glow/src/shader/fragment.glsl
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@ -16,7 +16,13 @@ varying vec4 v_rgba;
varying vec2 v_tc;
#endif
#ifndef SRGB_SUPPORTED
#ifdef SRGB_SUPPORTED
void main() {
// The texture sampler is sRGB aware, and OpenGL already expects linear rgba output
// so no need for any sRGB conversions here:
gl_FragColor = v_rgba * texture2D(u_sampler, v_tc);
}
#else
// 0-255 sRGB from 0-1 linear
vec3 srgb_from_linear(vec3 rgb) {
bvec3 cutoff = lessThan(rgb, vec3(0.0031308));
@ -28,6 +34,7 @@ vec3 srgb_from_linear(vec3 rgb) {
vec4 srgba_from_linear(vec4 rgba) {
return vec4(srgb_from_linear(rgba.rgb), 255.0 * rgba.a);
}
// 0-1 linear from 0-255 sRGB
vec3 linear_from_srgb(vec3 srgb) {
bvec3 cutoff = lessThan(srgb, vec3(10.31475));
@ -41,12 +48,12 @@ vec4 linear_from_srgba(vec4 srgba) {
}
void main() {
// We must decode the colors, since WebGL doesn't come with sRGBA textures:
// We must decode the colors, since WebGL1 doesn't come with sRGBA textures:
vec4 texture_rgba = linear_from_srgba(texture2D(u_sampler, v_tc) * 255.0);
/// Multiply vertex color with texture color (in linear space).
gl_FragColor = v_rgba * texture_rgba;
// WebGL doesn't support linear blending in the framebuffer,
// WebGL1 doesn't support linear blending in the framebuffer,
// so we do a hack here where we change the premultiplied alpha
// to do the multiplication in gamma space instead:
@ -65,13 +72,5 @@ void main() {
if (gl_FragColor.a > 0.0) {
gl_FragColor.rgb *= gl_FragColor.a;
}
}
#else
void main() {
// The texture sampler is sRGB aware, and OpenGL already expects linear rgba output
// so no need for any sRGB conversions here:
gl_FragColor = v_rgba * texture2D(u_sampler, v_tc);
}
#endif

3
egui_glow/src/shader/vertex.glsl
View file

@ -11,6 +11,7 @@
#ifdef GL_ES
precision mediump float;
#endif
uniform vec2 u_screen_size;
I vec2 a_pos;
I vec4 a_srgba; // 0-255 sRGB
@ -36,7 +37,7 @@ void main() {
1.0 - 2.0 * a_pos.y / u_screen_size.y,
0.0,
1.0);
// egui encodes vertex colors in gamma spaces, so we must decode the colors here:
// egui encodes vertex colors in gamma space, so we must decode the colors here:
v_rgba = linear_from_srgba(a_srgba);
v_tc = a_tc;
}