diff options
Diffstat (limited to 'intern/cycles/kernel/svm/svm_light_path.h')
| -rw-r--r-- | intern/cycles/kernel/svm/svm_light_path.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/intern/cycles/kernel/svm/svm_light_path.h b/intern/cycles/kernel/svm/svm_light_path.h index ebbcb5be61f..b29dc9cbd45 100644 --- a/intern/cycles/kernel/svm/svm_light_path.h +++ b/intern/cycles/kernel/svm/svm_light_path.h @@ -39,5 +39,32 @@ __device void svm_node_light_path(ShaderData *sd, float *stack, uint type, uint stack_store_float(stack, out_offset, info); } +/* Light Falloff Node */ + +__device void svm_node_light_falloff(ShaderData *sd, float *stack, uint4 node) +{ + uint strength_offset, out_offset, smooth_offset; + + decode_node_uchar4(node.z, &strength_offset, &smooth_offset, &out_offset, NULL); + + float strength = stack_load_float(stack, strength_offset); + uint type = node.y; + + switch(type) { + case NODE_LIGHT_FALLOFF_QUADRATIC: break; + case NODE_LIGHT_FALLOFF_LINEAR: strength *= sd->ray_length; break; + case NODE_LIGHT_FALLOFF_CONSTANT: strength *= sd->ray_length*sd->ray_length; break; + } + + float smooth = stack_load_float(stack, smooth_offset); + + if(smooth > 0.0f) { + float squared = sd->ray_length*sd->ray_length; + strength *= squared/(smooth + squared); + } + + stack_store_float(stack, out_offset, strength); +} + CCL_NAMESPACE_END |