[Bf-blender-cvs] [f8aab24fb51] blender2.8: Eevee: Volumetrics: Add Volume Absorption node.

[Clément Foucault]

Commit: f8aab24fb5166c9ba935cb8f479cfd24244e7136
Author: Clément Foucault
Date:   Tue Jul 4 15:29:18 2017 +0200
Branches: blender2.8
https://developer.blender.org/rBf8aab24fb5166c9ba935cb8f479cfd24244e7136

Eevee: Volumetrics: Add Volume Absorption node.

===================================================================

M	source/blender/gpu/shaders/gpu_shader_material.glsl
M	source/blender/nodes/shader/nodes/node_shader_volume_absorption.c

===================================================================

diff --git a/source/blender/gpu/shaders/gpu_shader_material.glsl b/source/blender/gpu/shaders/gpu_shader_material.glsl
index 5458eb91199..7e639717905 100644
--- a/source/blender/gpu/shaders/gpu_shader_material.glsl
+++ b/source/blender/gpu/shaders/gpu_shader_material.glsl
@@ -2955,6 +2955,15 @@ void node_volume_scatter(vec4 color, float density, float anisotropy, out Closur
 #endif
 }
 
+void node_volume_absorption(vec4 color, float density, out Closure result)
+{
+#ifdef VOLUMETRICS
+	result = Closure((1.0 - color.rgb) * density, vec3(0.0), vec3(0.0), 0.0);
+#else
+	result = CLOSURE_DEFAULT;
+#endif
+}
+
 /* closures */
 
 void node_mix_shader(float fac, Closure shader1, Closure shader2, out Closure shader)
diff --git a/source/blender/nodes/shader/nodes/node_shader_volume_absorption.c b/source/blender/nodes/shader/nodes/node_shader_volume_absorption.c
index 4861871e8d3..03264e0acb6 100644
--- a/source/blender/nodes/shader/nodes/node_shader_volume_absorption.c
+++ b/source/blender/nodes/shader/nodes/node_shader_volume_absorption.c
@@ -40,9 +40,9 @@ static bNodeSocketTemplate sh_node_volume_absorption_out[] = {
 	{	-1, 0, ""	}
 };
 
-static int node_shader_gpu_volume_absorption(GPUMaterial *UNUSED(mat), bNode *UNUSED(node), bNodeExecData *UNUSED(execdata), GPUNodeStack *UNUSED(in), GPUNodeStack *UNUSED(out))
+static int node_shader_gpu_volume_absorption(GPUMaterial *mat, bNode *UNUSED(node), bNodeExecData *UNUSED(execdata), GPUNodeStack *in, GPUNodeStack *out)
 {
-	return false;
+	return GPU_stack_link(mat, "node_volume_absorption", in, out);
 }
 
 /* node type definition */