Hair Info Length Attribute

Goal is to add the length attribute to the Hair Info node, for better control over color gradients or similar along the hair.

Reviewed By: #eevee_viewport, brecht

Differential Revision: https://developer.blender.org/D10481

1 files changed, 10 insertions, 0 deletions

diff --git a/source/blender/gpu/shaders/gpu_shader_codegen_lib.glsl b/source/blender/gpu/shaders/gpu_shader_codegen_lib.glsl
index f7bf3d33361..193a4190cbf 100644
--- a/source/blender/gpu/shaders/gpu_shader_codegen_lib.glsl
+++ b/source/blender/gpu/shaders/gpu_shader_codegen_lib.glsl
@@ -42,6 +42,11 @@ vec3 orco_get(vec3 local_pos, mat4 modelmatinv, vec4 orco_madd[2], const sampler
   return orco_madd[0].xyz + orco * orco_madd[1].xyz;
 }
 
+float hair_len_get(int id, const samplerBuffer len)
+{
+  return texelFetch(len, id).x;
+}
+
 vec4 tangent_get(const samplerBuffer attr, mat3 normalmat)
 {
   /* Unsupported */
@@ -71,6 +76,11 @@ vec3 orco_get(vec3 local_pos, mat4 modelmatinv, vec4 orco_madd[2], vec4 orco)
   }
 }
 
+float hair_len_get(int id, const float len)
+{
+  return len;
+}
+
 vec4 tangent_get(vec4 attr, mat3 normalmat)
 {
   vec4 tangent;