Realtime Compositor: Use luminance coefficients in SMAA

This patch utilizes luminance coefficients in the SMAA edge detection
phase to match the existing implementation in the CPU compositor.

source/blender/compositor/realtime_compositor/algorithms/intern/smaa.cc

@@ -1,5 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0-or-later */
 
+#include "IMB_colormanagement.h"
+
 #include "GPU_shader.h"
 #include "GPU_texture.h"
 
@@ -20,6 +22,10 @@ static Result detect_edges(Context &context,
   GPUShader *shader = context.shader_manager().get("compositor_smaa_edge_detection");
   GPU_shader_bind(shader);
 
+  float luminance_coefficients[3];
+  IMB_colormanagement_get_luminance_coefficients(luminance_coefficients);
+
+  GPU_shader_uniform_3fv(shader, "luminance_coefficients", luminance_coefficients);
   GPU_shader_uniform_1f(shader, "smaa_threshold", threshold);
   GPU_shader_uniform_1f(
       shader, "smaa_local_contrast_adaptation_factor", local_contrast_adaptation_factor);

source/blender/compositor/realtime_compositor/shaders/infos/compositor_smaa_info.hh

@@ -5,11 +5,12 @@
 GPU_SHADER_CREATE_INFO(compositor_smaa_edge_detection)
     .local_group_size(16, 16)
     .define("SMAA_GLSL_3")
-    .define("SMAA_LUMA_WEIGHT", "float4(1.0, 1.0, 1.0, 1.0)")
     .define("SMAA_RT_METRICS",
             "vec4(1.0 / vec2(textureSize(input_tx, 0)), vec2(textureSize(input_tx, 0)))")
+    .define("SMAA_LUMA_WEIGHT", "vec4(luminance_coefficients, 0.0)")
     .define("SMAA_THRESHOLD", "smaa_threshold")
     .define("SMAA_LOCAL_CONTRAST_ADAPTATION_FACTOR", "smaa_local_contrast_adaptation_factor")
+    .push_constant(Type::VEC3, "luminance_coefficients")
     .push_constant(Type::FLOAT, "smaa_threshold")
     .push_constant(Type::FLOAT, "smaa_local_contrast_adaptation_factor")
     .sampler(0, ImageType::FLOAT_2D, "input_tx")