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OpenGLRenderer: Allow RenderPipeline without a fragment shader on OpenGL ES

This commit is contained in:
Jérôme Leclercq 2021-05-29 00:32:00 +02:00
parent 336e70f72e
commit 109b2a156e
7 changed files with 60 additions and 11 deletions
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2
examples/DeferredShading/main.cpp
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@ -374,7 +374,7 @@ int main()
stencilPipelineInfo.stencilBack.compare = Nz::RendererComparison::Always;
stencilPipelineInfo.stencilBack.depthFail = Nz::StencilOperation::Invert;
stencilPipelineInfo.shaderModules.push_back(device->InstantiateShaderModule(Nz::ShaderStageType::Fragment | Nz::ShaderStageType::Vertex, Nz::ShaderLanguage::NazaraShader, resourceDir / "lighting.nzsl", {}));
stencilPipelineInfo.shaderModules.push_back(device->InstantiateShaderModule(Nz::ShaderStageType::Vertex, Nz::ShaderLanguage::NazaraShader, resourceDir / "lighting.nzsl", {}));
std::shared_ptr<Nz::RenderPipeline> stencilPipeline = device->InstantiateRenderPipeline(stencilPipelineInfo);

16
include/Nazara/OpenGLRenderer/OpenGLShaderModule.hpp
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@ -20,23 +20,31 @@ namespace Nz
class NAZARA_OPENGLRENDERER_API OpenGLShaderModule : public ShaderModule
{
public:
OpenGLShaderModule(OpenGLDevice& device, ShaderStageTypeFlags shaderStages, ShaderAst::StatementPtr& shaderAst, const ShaderWriter::States& states);
OpenGLShaderModule(OpenGLDevice& device, ShaderStageTypeFlags shaderStages, ShaderLanguage lang, const void* source, std::size_t sourceSize, const ShaderWriter::States& states);
struct Shader;
OpenGLShaderModule(OpenGLDevice& device, ShaderStageTypeFlags shaderStages, ShaderAst::StatementPtr& shaderAst, const ShaderWriter::States& states = {});
OpenGLShaderModule(OpenGLDevice& device, ShaderStageTypeFlags shaderStages, ShaderLanguage lang, const void* source, std::size_t sourceSize, const ShaderWriter::States& states = {});
OpenGLShaderModule(const OpenGLShaderModule&) = delete;
OpenGLShaderModule(OpenGLShaderModule&&) noexcept = default;
~OpenGLShaderModule() = default;
inline const std::vector<GL::Shader>& GetShaders() const;
inline const std::vector<Shader>& GetShaders() const;
OpenGLShaderModule& operator=(const OpenGLShaderModule&) = delete;
OpenGLShaderModule& operator=(OpenGLShaderModule&&) noexcept = default;
struct Shader
{
ShaderStageType stage;
GL::Shader shader;
};
private:
void Create(OpenGLDevice& device, ShaderStageTypeFlags shaderStages, ShaderAst::StatementPtr& shaderAst, const ShaderWriter::States& states);
static void CheckCompilationStatus(GL::Shader& shader);
std::vector<GL::Shader> m_shaders;
std::vector<Shader> m_shaders;
};
}

2
include/Nazara/OpenGLRenderer/OpenGLShaderModule.inl
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@ -7,7 +7,7 @@
namespace Nz
{
inline const std::vector<GL::Shader>& OpenGLShaderModule::GetShaders() const
inline auto OpenGLShaderModule::GetShaders() const -> const std::vector<Shader>&
{
return m_shaders;
}

3
include/Nazara/Shader/ShaderBuilder.hpp
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@ -20,6 +20,7 @@ namespace Nz::ShaderBuilder
struct AccessMember
{
inline std::unique_ptr<ShaderAst::AccessMemberIdentifierExpression> operator()(ShaderAst::ExpressionPtr structExpr, std::vector<std::string> memberIdentifiers) const;
inline std::unique_ptr<ShaderAst::AccessMemberIndexExpression> operator()(ShaderAst::ExpressionPtr structExpr, std::vector<std::size_t> memberIndices) const;
};
struct Assign
@ -104,7 +105,7 @@ namespace Nz::ShaderBuilder
struct Multi
{
inline std::unique_ptr<ShaderAst::MultiStatement> operator()(std::vector<ShaderAst::StatementPtr> statements) const;
inline std::unique_ptr<ShaderAst::MultiStatement> operator()(std::vector<ShaderAst::StatementPtr> statements = {}) const;
};
template<typename T>

9
include/Nazara/Shader/ShaderBuilder.inl
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@ -16,6 +16,15 @@ namespace Nz::ShaderBuilder
return accessMemberNode;
}
inline std::unique_ptr<ShaderAst::AccessMemberIndexExpression> Impl::AccessMember::operator()(ShaderAst::ExpressionPtr structExpr, std::vector<std::size_t> memberIndices) const
{
auto accessMemberNode = std::make_unique<ShaderAst::AccessMemberIndexExpression>();
accessMemberNode->structExpr = std::move(structExpr);
accessMemberNode->memberIndices = std::move(memberIndices);
return accessMemberNode;
}
inline std::unique_ptr<ShaderAst::AssignExpression> Impl::Assign::operator()(ShaderAst::AssignType op, ShaderAst::ExpressionPtr left, ShaderAst::ExpressionPtr right) const
{
auto assignNode = std::make_unique<ShaderAst::AssignExpression>();

31
src/Nazara/OpenGLRenderer/OpenGLRenderPipeline.cpp
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@ -8,6 +8,7 @@
#include <Nazara/OpenGLRenderer/OpenGLRenderPipelineLayout.hpp>
#include <Nazara/OpenGLRenderer/OpenGLShaderModule.hpp>
#include <Nazara/Shader/GlslWriter.hpp>
#include <Nazara/Shader/ShaderBuilder.hpp>
#include <cassert>
#include <stdexcept>
#include <Nazara/OpenGLRenderer/Debug.hpp>
@ -21,11 +22,37 @@ namespace Nz
if (!m_program.Create(device))
throw std::runtime_error("failed to create program");
ShaderStageTypeFlags stageFlags;
for (const auto& shaderModulePtr : m_pipelineInfo.shaderModules)
{
OpenGLShaderModule& shaderModule = static_cast<OpenGLShaderModule&>(*shaderModulePtr);
for (const GL::Shader& shader : shaderModule.GetShaders())
m_program.AttachShader(shader.GetObjectId());
for (const auto& shaderEntry : shaderModule.GetShaders())
{
m_program.AttachShader(shaderEntry.shader.GetObjectId());
stageFlags |= shaderEntry.stage;
}
}
// OpenGL ES programs must have both vertex and fragment shaders or a compute shader or a mesh and fragment shader.
if (device.GetReferenceContext().GetParams().type == GL::ContextType::OpenGL_ES)
{
auto GenerateIfMissing = [&](ShaderStageType stage)
{
if (!stageFlags.Test(stage))
{
ShaderAst::StatementPtr dummyAst = ShaderBuilder::DeclareFunction(stage, "main", {}, {});
OpenGLShaderModule shaderModule(device, stage, dummyAst);
for (const auto& shaderEntry : shaderModule.GetShaders())
{
m_program.AttachShader(shaderEntry.shader.GetObjectId());
stageFlags |= shaderEntry.stage;
}
}
};
GenerateIfMissing(ShaderStageType::Fragment);
GenerateIfMissing(ShaderStageType::Vertex);
}
m_program.Link();

8
src/Nazara/OpenGLRenderer/OpenGLShaderModule.cpp
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@ -44,7 +44,9 @@ namespace Nz
shader.Compile();
CheckCompilationStatus(shader);
m_shaders.emplace_back(std::move(shader));
auto& entry = m_shaders.emplace_back();
entry.shader = std::move(shader);
entry.stage = shaderStage;
break;
}
}
@ -130,7 +132,9 @@ namespace Nz
CheckCompilationStatus(shader);
m_shaders.emplace_back(std::move(shader));
auto& entry = m_shaders.emplace_back();
entry.shader = std::move(shader);
entry.stage = shaderStage;
}
}
}