forked from bartvdbraak/blender
123 lines
2.7 KiB
C++
123 lines
2.7 KiB
C++
/*
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* Copyright 2011-2013 Blender Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "constant_fold.h"
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#include "graph.h"
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#include "util_foreach.h"
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CCL_NAMESPACE_BEGIN
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ConstantFolder::ConstantFolder(ShaderGraph *graph, ShaderNode *node, ShaderOutput *output)
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: graph(graph), node(node), output(output)
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{
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}
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bool ConstantFolder::all_inputs_constant() const
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{
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foreach(ShaderInput *input, node->inputs) {
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if(input->link) {
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return false;
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}
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}
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return true;
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}
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void ConstantFolder::make_constant(float value) const
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{
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foreach(ShaderInput *sock, output->links) {
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sock->set(value);
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}
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graph->disconnect(output);
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}
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void ConstantFolder::make_constant(float3 value) const
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{
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foreach(ShaderInput *sock, output->links) {
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sock->set(value);
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}
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graph->disconnect(output);
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}
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void ConstantFolder::make_constant_clamp(float value, bool clamp) const
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{
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make_constant(clamp ? saturate(value) : value);
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}
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void ConstantFolder::make_constant_clamp(float3 value, bool clamp) const
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{
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if (clamp) {
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value.x = saturate(value.x);
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value.y = saturate(value.y);
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value.z = saturate(value.z);
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}
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make_constant(value);
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}
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void ConstantFolder::bypass(ShaderOutput *new_output) const
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{
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assert(new_output);
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/* Remove all outgoing links from socket and connect them to new_output instead.
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* The graph->relink method affects node inputs, so it's not safe to use in constant
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* folding if the node has multiple outputs and will thus be folded multiple times. */
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vector<ShaderInput*> outputs = output->links;
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graph->disconnect(output);
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foreach(ShaderInput *sock, outputs) {
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graph->connect(new_output, sock);
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}
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}
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void ConstantFolder::discard() const
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{
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assert(output->type() == SocketType::CLOSURE);
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graph->disconnect(output);
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}
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void ConstantFolder::bypass_or_discard(ShaderInput *input) const
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{
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assert(input->type() == SocketType::CLOSURE);
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if (input->link) {
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bypass(input->link);
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}
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else {
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discard();
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}
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}
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bool ConstantFolder::try_bypass_or_make_constant(ShaderInput *input, float3 input_value, bool clamp) const
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{
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if(!input->link) {
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make_constant_clamp(input_value, clamp);
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return true;
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}
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else if(!clamp) {
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bypass(input->link);
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return true;
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}
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return false;
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}
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CCL_NAMESPACE_END
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