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// Copyright 2018 The Amber Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "src/pipeline.h"
#include <algorithm>
#include <set>
namespace amber {
Pipeline::ShaderInfo::ShaderInfo(const Shader* shader)
: shader_(shader), entry_point_("main") {}
Pipeline::ShaderInfo::ShaderInfo(const ShaderInfo&) = default;
Pipeline::ShaderInfo::~ShaderInfo() = default;
Pipeline::Pipeline(PipelineType type) : pipeline_type_(type) {}
Pipeline::~Pipeline() = default;
Result Pipeline::AddShader(const Shader* shader) {
if (!shader)
return Result("shader can not be null when attached to pipeline");
if (pipeline_type_ == PipelineType::kCompute &&
shader->GetType() != ShaderType::kCompute) {
return Result("only compute shaders allowed in a compute pipeline");
}
if (pipeline_type_ == PipelineType::kGraphics &&
shader->GetType() == ShaderType::kCompute) {
return Result("can not add a compute shader to a graphics pipeline");
}
for (const auto& info : shaders_) {
const auto* is = info.GetShader();
if (is == shader)
return Result("can not add duplicate shader to pipeline");
if (is->GetType() == shader->GetType())
return Result("can not add duplicate shader type to pipeline");
}
shaders_.emplace_back(shader);
return {};
}
Result Pipeline::SetShaderOptimizations(const Shader* shader,
const std::vector<std::string>& opts) {
if (!shader)
return Result("invalid shader specified for optimizations");
std::set<std::string> seen;
for (const auto& opt : opts) {
if (seen.count(opt) != 0)
return Result("duplicate optimization flag (" + opt + ") set on shader");
seen.insert(opt);
}
for (auto& info : shaders_) {
const auto* is = info.GetShader();
if (is == shader) {
info.SetShaderOptimizations(opts);
return {};
}
}
return Result("unknown shader specified for optimizations: " +
shader->GetName());
}
Result Pipeline::SetShaderEntryPoint(const Shader* shader,
const std::string& name) {
if (!shader)
return Result("invalid shader specified for entry point");
if (name.empty())
return Result("entry point should not be blank");
for (auto& info : shaders_) {
if (info.GetShader() == shader) {
if (info.GetEntryPoint() != "main")
return Result("multiple entry points given for the same shader");
info.SetEntryPoint(name);
return {};
}
}
return Result("unknown shader specified for entry point: " +
shader->GetName());
}
Result Pipeline::Validate() const {
if (pipeline_type_ == PipelineType::kGraphics)
return ValidateGraphics();
return ValidateCompute();
}
Result Pipeline::ValidateGraphics() const {
if (shaders_.empty())
return Result("graphics pipeline requires vertex and fragment shaders");
bool found_vertex = false;
bool found_fragment = false;
for (const auto& info : shaders_) {
const auto* is = info.GetShader();
if (is->GetType() == ShaderType::kVertex)
found_vertex = true;
if (is->GetType() == ShaderType::kFragment)
found_fragment = true;
if (found_vertex && found_fragment)
break;
}
if (!found_vertex && !found_fragment)
return Result("graphics pipeline requires vertex and fragment shaders");
if (!found_vertex)
return Result("graphics pipeline requires a vertex shader");
if (!found_fragment)
return Result("graphics pipeline requires a fragment shader");
return {};
}
Result Pipeline::ValidateCompute() const {
if (shaders_.empty())
return Result("compute pipeline requires a compute shader");
return {};
}
} // namespace amber
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