Fix wrong color space

src/integration.rs

@@ -885,7 +885,7 @@ impl<A: AllocatorTrait> Integration<A> {
                 .array_layers(1)
                 .extent(extent)
                 .flags(vk::ImageCreateFlags::empty())
-                .format(vk::Format::R8G8B8A8_UNORM)
+                .format(vk::Format::R8G8B8A8_SRGB)
                 .image_type(vk::ImageType::TYPE_2D)
                 .initial_layout(vk::ImageLayout::UNDEFINED)
                 .mip_levels(1)
@@ -920,7 +920,7 @@ impl<A: AllocatorTrait> Integration<A> {
             let create_info = vk::ImageViewCreateInfo::builder()
                 .components(vk::ComponentMapping::default())
                 .flags(vk::ImageViewCreateFlags::empty())
-                .format(vk::Format::R8G8B8A8_UNORM)
+                .format(vk::Format::R8G8B8A8_SRGB)
                 .image(texture_image)
                 .subresource_range(
                     vk::ImageSubresourceRange::builder()

src/shaders/src/frag.frag

@@ -7,4 +7,17 @@ layout(location = 0) out vec4 outColor;
 
 layout(binding = 0, set = 0) uniform sampler2D font_texture;
 
-void main() { outColor = inColor * texture(font_texture, inUV); }
+// 0-1 sRGB gamma  from  0-1 linear
+vec3 srgb_gamma_from_linear(vec3 rgb) {
+    bvec3 cutoff = lessThan(rgb, vec3(0.0031308));
+    vec3 lower = rgb * vec3(12.92);
+    vec3 higher = vec3(1.055) * pow(rgb, vec3(1.0 / 2.4)) - vec3(0.055);
+    return mix(higher, lower, vec3(cutoff));
+}
+
+// 0-1 sRGBA gamma  from  0-1 linear
+vec4 srgba_gamma_from_linear(vec4 rgba) {
+    return vec4(srgb_gamma_from_linear(rgba.rgb), rgba.a);
+}
+
+void main() { outColor = inColor * srgba_gamma_from_linear(texture(font_texture, inUV)); }

src/shaders/src/vert.vert

@@ -10,17 +10,11 @@ layout(location = 1) out vec2 outUV;
 layout(push_constant) uniform PushConstants { vec2 screen_size; }
 pushConstants;
 
-vec3 srgb_to_linear(vec3 srgb) {
-    bvec3 cutoff = lessThan(srgb, vec3(0.04045));
-    vec3 lower = srgb / vec3(12.92);
-    vec3 higher = pow((srgb + vec3(0.055)) / vec3(1.055), vec3(2.4));
-    return mix(higher, lower, cutoff);
-}
 
 void main() {
   gl_Position =
       vec4(2.0 * inPos.x / pushConstants.screen_size.x - 1.0,
            2.0 * inPos.y / pushConstants.screen_size.y - 1.0, 0.0, 1.0);
-  outColor = vec4(srgb_to_linear(inColor.rgb), inColor.a);
+  outColor = inColor;
   outUV = inUV;
 }