Workbench: Revealage buffer

1 files changed, 8 insertions, 1 deletions

diff --git a/source/blender/draw/engines/workbench/shaders/workbench_common_lib.glsl b/source/blender/draw/engines/workbench/shaders/workbench_common_lib.glsl
index 2550f44271b..88b715f55a8 100644
--- a/source/blender/draw/engines/workbench/shaders/workbench_common_lib.glsl
+++ b/source/blender/draw/engines/workbench/shaders/workbench_common_lib.glsl
@@ -1,5 +1,5 @@
 #define NO_OBJECT_ID uint(0)
-
+#define EPSILON 0.00001
 /* 4x4 bayer matrix prepared for 8bit UNORM precision error. */
 #define P(x) (((x + 0.5) * (1.0 / 16.0) - 0.5) * (1.0 / 255.0))
 const vec4 dither_mat4x4[4] = vec4[4](
@@ -62,3 +62,10 @@ void fresnel(vec3 I, vec3 N, float ior, out float kr)
 	// As a consequence of the conservation of energy, transmittance is given by:
 	// kt = 1 - kr;
 }
+
+vec4 calculate_transparent_accum(vec4 premultiplied) {
+	float a = min(1.0, premultiplied.a) * 8.0 + 0.01;
+	float b = -gl_FragCoord.z * 0.95 + 1.0;
+	float w = clamp(a * a * a * 1e8 * b * b * b, 1e-2, 3e2);
+	return premultiplied * w;
+}