wgui to use srgb

wgui/src/renderer_vk/shaders/image.frag

@@ -13,6 +13,7 @@ layout(location = 0) out vec4 out_color;
 
 #define UNIFORM_PARAMS_SET 0
 #include "uniform.glsl"
+#include "srgb.glsl"
 
 layout(set = 2, binding = 0) uniform sampler2D image;
 
@@ -52,4 +53,5 @@ void main() {
     // rounding cutout alpha
     out_color.a *= 1.0 - smoothstep(-pixel_size, 0.0, sdf);
   }
+  out_color.rgb = to_srgb(out_color.rgb);
 }

wgui/src/renderer_vk/shaders/rect.frag

@@ -14,6 +14,7 @@ layout(location = 0) out vec4 out_color;
 
 #define UNIFORM_PARAMS_SET 0
 #include "uniform.glsl"
+#include "srgb.glsl"
 
 void main() {
   float rect_aspect = in_rect_size.x / in_rect_size.y;
@@ -51,4 +52,5 @@ void main() {
     // rounding cutout alpha
     out_color.a *= 1.0 - smoothstep(-pixel_size, 0.0, sdf);
   }
+  out_color.rgb = to_srgb(out_color.rgb);
 }

wgui/src/renderer_vk/shaders/srgb.glsl

@@ -0,0 +1,6 @@
+vec3 to_srgb(in vec3 in_color) {
+    bvec3 cutoff = lessThan(in_color, vec3(0.04045));
+    vec3 higher = pow((in_color + vec3(0.055))/vec3(1.055), vec3(2.4));
+    vec3 lower = in_color/vec3(12.92);
+    return mix(higher, lower, cutoff);
+}

wgui/src/renderer_vk/shaders/text.frag

@@ -12,6 +12,8 @@ layout(location = 0) out vec4 out_color;
 layout(set = 0, binding = 0) uniform sampler2D color_atlas;
 layout(set = 1, binding = 0) uniform sampler2D mask_atlas;
 
+#include "srgb.glsl"
+
 void main() {
   if (in_content_type == 0u) {
     out_color = texture(color_atlas, in_uv) * in_color;
@@ -19,4 +21,5 @@ void main() {
     out_color.rgb = in_color.rgb;
     out_color.a = in_color.a * texture(mask_atlas, in_uv).r;
   }
+  out_color.rgb = to_srgb(out_color.rgb);
 }