UI: desaturate toolbar icons that the mouse is not over.

This does not look great with light toolbar buttons as in the default,
so consider this a work in progress.

1 files changed, 13 insertions, 0 deletions

diff --git a/source/blender/gpu/shaders/gpu_shader_image_desaturate_frag.glsl b/source/blender/gpu/shaders/gpu_shader_image_desaturate_frag.glsl
new file mode 100644
index 00000000000..5b2ccb8ff3a
--- /dev/null
+++ b/source/blender/gpu/shaders/gpu_shader_image_desaturate_frag.glsl
@@ -0,0 +1,13 @@
+
+in vec2 texCoord_interp;
+out vec4 fragColor;
+
+uniform vec4 color;
+uniform sampler2D image;
+
+void main()
+{
+	vec4 tex = texture(image, texCoord_interp);
+	tex.rgb = 0.3333333 * vec3(tex.r + tex.g + tex.b);
+	fragColor = tex * color;
+}