1 files changed, 37 insertions, 0 deletions
diff --git a/source/blender/draw/engines/eevee_next/shaders/eevee_colorspace_lib.glsl b/source/blender/draw/engines/eevee_next/shaders/eevee_colorspace_lib.glsl
new file mode 100644
index 00000000000..d5fdaae6fc1
--- /dev/null
+++ b/source/blender/draw/engines/eevee_next/shaders/eevee_colorspace_lib.glsl
@@ -0,0 +1,37 @@
+
+/* -------------------------------------------------------------------- */
+/** \name YCoCg
+ * \{ */
+
+vec3 colorspace_YCoCg_from_scene_linear(vec3 rgb_color)
+{
+  const mat3 colorspace_tx = transpose(mat3(vec3(1, 2, 1),     /* Y */
+                                            vec3(2, 0, -2),    /* Co */
+                                            vec3(-1, 2, -1))); /* Cg */
+  return colorspace_tx * rgb_color;
+}
+
+vec4 colorspace_YCoCg_from_scene_linear(vec4 rgba_color)
+{
+  return vec4(colorspace_YCoCg_from_scene_linear(rgba_color.rgb), rgba_color.a);
+}
+
+vec3 colorspace_scene_linear_from_YCoCg(vec3 ycocg_color)
+{
+  float Y = ycocg_color.x;
+  float Co = ycocg_color.y;
+  float Cg = ycocg_color.z;
+
+  vec3 rgb_color;
+  rgb_color.r = Y + Co - Cg;
+  rgb_color.g = Y + Cg;
+  rgb_color.b = Y - Co - Cg;
+  return rgb_color * 0.25;
+}
+
+vec4 colorspace_scene_linear_from_YCoCg(vec4 ycocg_color)
+{
+  return vec4(colorspace_scene_linear_from_YCoCg(ycocg_color.rgb), ycocg_color.a);
+}
+
+/** \} */