1 files changed, 22 insertions, 0 deletions
diff --git a/source/blender/compositor/realtime_compositor/shaders/compositor_tone_map_photoreceptor.glsl b/source/blender/compositor/realtime_compositor/shaders/compositor_tone_map_photoreceptor.glsl
new file mode 100644
index 00000000000..167006585ca
--- /dev/null
+++ b/source/blender/compositor/realtime_compositor/shaders/compositor_tone_map_photoreceptor.glsl
@@ -0,0 +1,22 @@
+#pragma BLENDER_REQUIRE(gpu_shader_compositor_texture_utilities.glsl)
+
+/* Tone mapping based on equation (1) and the trilinear interpolation between equations (6) and (7)
+ * from Reinhard, Erik, and Kate Devlin. "Dynamic range reduction inspired by photoreceptor
+ * physiology." IEEE transactions on visualization and computer graphics 11.1 (2005): 13-24. */
+void main()
+{
+  ivec2 texel = ivec2(gl_GlobalInvocationID.xy);
+
+  vec4 input_color = texture_load(input_tx, texel);
+  float input_luminance = dot(input_color.rgb, luminance_coefficients);
+
+  /* Trilinear interpolation between equations (6) and (7) from Reinhard's 2005 paper. */
+  vec4 local_adaptation_level = mix(vec4(input_luminance), input_color, chromatic_adaptation);
+  vec4 adaptation_level = mix(global_adaptation_level, local_adaptation_level, light_adaptation);
+
+  /* Equation (1) from Reinhard's 2005 paper, assuming Vmax is 1. */
+  vec4 semi_saturation = pow(intensity * adaptation_level, vec4(contrast));
+  vec4 tone_mapped_color = input_color / (input_color + semi_saturation);
+
+  imageStore(output_img, texel, vec4(tone_mapped_color.rgb, input_color.a));
+}