2a8ebc4906
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
90 lines
3.4 KiB
C++
90 lines
3.4 KiB
C++
#pragma once
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#include <mln/gfx/backend.hpp>
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#include <mln/shaders/shader_source.hpp>
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#include <array>
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#include <cassert>
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#include <string>
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#include <unordered_map>
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namespace mln {
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class ProgramParameters {
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public:
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struct ProgramSource {
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gfx::Backend::Type backend{gfx::Backend::Type::TYPE_MAX};
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std::string vertex;
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std::string fragment;
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ProgramSource() = default;
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/// @brief Construct a new ProgramSource object
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/// @param forBackend The provided source code is intended for use with the given rendering backend.
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/// @param vertex_ The vertex shader source code, or empty string if not provided.
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/// @param fragment_ The fragment shader source code, or empty string if not provided.
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ProgramSource(gfx::Backend::Type forBackend, const std::string& vertex_, const std::string& fragment_)
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: backend(forBackend),
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vertex(vertex_),
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fragment(fragment_) {
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assert(gfx::Backend::Type::TYPE_MAX != forBackend);
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}
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};
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ProgramParameters(float pixelRatio, bool overdraw);
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/// @brief Provide custom shader code which overrides any default source present
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/// @param source ProgramSource
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/// @return Mutated ProgramParameters
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ProgramParameters withShaderSource(const ProgramSource& source) const noexcept;
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/// @brief Provide default shader source
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/// @param source ProgramSource
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/// @return Mutated ProgramParameters
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ProgramParameters withDefaultSource(const ProgramSource& source) const noexcept;
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/// @brief Provide a `BuiltIn` value used to indicate the program type
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/// @param source ProgramSource
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/// @return Mutated ProgramParameters
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ProgramParameters withProgramType(shaders::BuiltIn type) const noexcept;
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shaders::BuiltIn getProgramType() const noexcept { return programType; }
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/// @brief Get a list of built-in shader preprocessor defines
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/// @return Shader source string
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/// @todo With the addition of future backends, defines should also be backend-aware
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const std::string& getDefinesString() const;
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/// @brief Get a list of built-in shader preprocessor defines
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/// @return Map of key-value pairs representing preprocessor definitions
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const std::unordered_map<std::string, std::string>& getDefines() const { return defines; }
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/// @brief Get source code for the vertex shader compatible with the requested backend
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/// @param backend Backend type
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/// @return Shader source string
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const std::string& vertexSource(gfx::Backend::Type backend) const;
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/// @brief Get source code for the fragment shader compatible with the requested backend
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/// @param backend Backend type
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/// @return Shader source string
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const std::string& fragmentSource(gfx::Backend::Type backend) const;
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bool getOverdrawInspectorEnabled() const { return overdrawInspector; }
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std::uint64_t getDefinesHash() const { return definesHash; }
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private:
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std::unordered_map<std::string, std::string> defines;
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std::uint64_t definesHash;
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shaders::BuiltIn programType = shaders::BuiltIn::None;
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// cached value of `defines` converted to string format
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mutable std::string definesStr;
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std::array<ProgramSource, static_cast<size_t>(gfx::Backend::Type::TYPE_MAX)> defaultSources;
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std::array<ProgramSource, static_cast<size_t>(gfx::Backend::Type::TYPE_MAX)> userSources;
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bool overdrawInspector;
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};
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} // namespace mln
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