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Fix #33152: cycles SVM crash with certain shader nodes setups where closures would

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appear multiple times after flattening the mix/add shader part of the graph into a
tree structure.
This commit is contained in:
Brecht Van Lommel
2012-11-24 14:50:21 +00:00
parent 9b701b7d32
commit ed986b62e8
2 changed files with 83 additions and 16 deletions
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85
intern/cycles/render/svm.cpp
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@@ -487,7 +487,39 @@ void SVMCompiler::generate_closure(ShaderNode *node, set<ShaderNode*>& done)
}
}
void SVMCompiler::generate_multi_closure(ShaderNode *node, set<ShaderNode*>& done, uint in_offset)
void SVMCompiler::count_closure_users(ShaderNode *node, map<ShaderNode*, MultiClosureData>& closure_data)
{
/* here we count the number of times each closure node is used, so that
* the last time we encounter it we can run the actually code with the
* weights from all other places added together */
if(node->name == ustring("mix_closure") || node->name == ustring("add_closure")) {
ShaderInput *cl1in = node->input("Closure1");
ShaderInput *cl2in = node->input("Closure2");
if(cl1in->link)
count_closure_users(cl1in->link->parent, closure_data);
if(cl2in->link)
count_closure_users(cl2in->link->parent, closure_data);
}
else {
MultiClosureData data;
if(closure_data.find(node) == closure_data.end()) {
data.stack_offset = SVM_STACK_INVALID;
data.users = 1;
}
else {
data = closure_data[node];
data.users++;
}
closure_data[node] = data;
}
}
void SVMCompiler::generate_multi_closure(ShaderNode *node, set<ShaderNode*>& done,
map<ShaderNode*, MultiClosureData>& closure_data, uint in_offset)
{
/* todo: the weaks point here is that unlike the single closure sampling
* we will evaluate all nodes even if they are used as input for closures
@@ -524,21 +556,37 @@ void SVMCompiler::generate_multi_closure(ShaderNode *node, set<ShaderNode*>& don
out2_offset = in_offset;
}
if(cl1in->link) {
generate_multi_closure(cl1in->link->parent, done, out1_offset);
if(cl1in->link)
generate_multi_closure(cl1in->link->parent, done, closure_data, out1_offset);
if(fin)
stack_clear_offset(SHADER_SOCKET_FLOAT, out1_offset);
}
if(cl2in->link)
generate_multi_closure(cl2in->link->parent, done, closure_data, out2_offset);
if(cl2in->link) {
generate_multi_closure(cl2in->link->parent, done, out2_offset);
if(fin)
stack_clear_offset(SHADER_SOCKET_FLOAT, out2_offset);
}
if(in_offset != SVM_STACK_INVALID)
stack_clear_offset(SHADER_SOCKET_FLOAT, in_offset);
}
else {
MultiClosureData data = closure_data[node];
if(data.stack_offset == SVM_STACK_INVALID) {
/* first time using closure, use stack position for weight */
data.stack_offset = in_offset;
}
else {
/* not first time using, add weights together */
add_node(NODE_MATH, NODE_MATH_ADD, data.stack_offset, in_offset);
add_node(NODE_MATH, data.stack_offset);
stack_clear_offset(SHADER_SOCKET_FLOAT, in_offset);
}
data.users--;
closure_data[node] = data;
/* still users coming? skip generating closure code */
if(data.users > 0)
return;
/* execute dependencies for closure */
foreach(ShaderInput *in, node->inputs) {
if(!node_skip_input(node, in) && in->link) {
@@ -548,7 +596,7 @@ void SVMCompiler::generate_multi_closure(ShaderNode *node, set<ShaderNode*>& don
}
}
mix_weight_offset = in_offset;
mix_weight_offset = data.stack_offset;
/* compile closure itself */
node->compile(*this);
@@ -563,6 +611,9 @@ void SVMCompiler::generate_multi_closure(ShaderNode *node, set<ShaderNode*>& don
current_shader->has_surface_transparent = true;
/* end node is added outside of this */
if(data.stack_offset != SVM_STACK_INVALID)
stack_clear_offset(SHADER_SOCKET_FLOAT, data.stack_offset);
}
}
@@ -634,8 +685,12 @@ void SVMCompiler::compile_type(Shader *shader, ShaderGraph *graph, ShaderType ty
if(generate) {
set<ShaderNode*> done;
if(use_multi_closure)
generate_multi_closure(clin->link->parent, done, SVM_STACK_INVALID);
if(use_multi_closure) {
map<ShaderNode*, MultiClosureData> closure_data;
count_closure_users(clin->link->parent, closure_data);
generate_multi_closure(clin->link->parent, done, closure_data, SVM_STACK_INVALID);
}
else
generate_closure(clin->link->parent, done);
}