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Fix T53600: Cycles shader mixing issue with principled BSDF and zero weights.

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SVM nodes need to read all data to get the right offset for the following node.
This is quite weak, a more generic solution would be good in the future.
This commit is contained in:
Brecht Van Lommel
2017-12-25 23:43:55 +01:00
parent e8e92dffed
commit 948515c21a
2 changed files with 21 additions and 9 deletions
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22
intern/cycles/kernel/svm/svm_closure.h
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@@ -56,7 +56,7 @@ ccl_device void svm_node_glass_setup(ShaderData *sd, MicrofacetBsdf *bsdf, int t
}
}
ccl_device void svm_node_closure_bsdf(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node, int path_flag, int *offset)
ccl_device void svm_node_closure_bsdf(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node, ShaderType shader_type, int path_flag, int *offset)
{
uint type, param1_offset, param2_offset;
@@ -67,8 +67,19 @@ ccl_device void svm_node_closure_bsdf(KernelGlobals *kg, ShaderData *sd, float *
/* note we read this extra node before weight check, so offset is added */
uint4 data_node = read_node(kg, offset);
if(mix_weight == 0.0f)
/* Only compute BSDF for surfaces, transparent variable is shared with volume extinction. */
if(mix_weight == 0.0f || shader_type != SHADER_TYPE_SURFACE) {
if(type == CLOSURE_BSDF_PRINCIPLED_ID) {
/* Read all principled BSDF extra data to get the right offset. */
read_node(kg, offset);
read_node(kg, offset);
read_node(kg, offset);
read_node(kg, offset);
read_node(kg, offset);
}
return;
}
float3 N = stack_valid(data_node.x)? stack_load_float3(stack, data_node.x): sd->N;
@@ -835,9 +846,14 @@ ccl_device void svm_node_closure_bsdf(KernelGlobals *kg, ShaderData *sd, float *
}
}
ccl_device void svm_node_closure_volume(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node, int path_flag)
ccl_device void svm_node_closure_volume(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node, ShaderType shader_type, int path_flag)
{
#ifdef __VOLUME__
/* Only sum extinction for volumes, variable is shared with surface transparency. */
if(shader_type != SHADER_TYPE_VOLUME) {
return;
}
uint type, param1_offset, param2_offset;
uint mix_weight_offset;