Cycles: restore Particle Info Index for now, keep it next to Random.

It seems to be useful still in cases where the particle are distributed in
a particular order or pattern, to colorize them along with that. This isn't
really well defined, but might as well avoid breaking backwards compatibility
for now.

1 files changed, 6 insertions, 4 deletions

diff --git a/source/blender/gpu/shaders/gpu_shader_material.glsl b/source/blender/gpu/shaders/gpu_shader_material.glsl
index 5fe14e76a90..1f5ffbdcc7e 100644
--- a/source/blender/gpu/shaders/gpu_shader_material.glsl
+++ b/source/blender/gpu/shaders/gpu_shader_material.glsl
@@ -189,16 +189,18 @@ void geom(
 }
 
 void particle_info(
-        vec4 sprops, vec3 loc, vec3 vel, vec3 avel,
-        out float random, out float age, out float life_time, out vec3 location,
+        vec4 sprops, vec4 loc, vec3 vel, vec3 avel,
+        out float index, out float random, out float age,
+        out float life_time, out vec3 location,
         out float size, out vec3 velocity, out vec3 angular_velocity)
 {
-	random = sprops.x;
+	index = sprops.x;
+	random = loc.w;
 	age = sprops.y;
 	life_time = sprops.z;
 	size = sprops.w;
 
-	location = loc;
+	location = loc.xyz;
 	velocity = vel;
 	angular_velocity = avel;
 }