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#pragma once
#include "GraphicsTags.hpp"
#include "Ires.hpp"
#include "RcPtr.hpp"
#include "Utils.hpp"
#include <glad/glad.h>
#include <robin_hood.h>
#include <memory>
#include <string_view>
#include <vector>
// TODO move to variable after pattern matching is in the language
// Forward declarations
class Shader;
class IresShader;
struct ShaderVariable {
enum Kind {
KD_Math,
KD_Sampler,
};
std::string name;
Kind kind;
GLuint location;
Tags::VertexElementSemantic semantic = Tags::VES_Generic;
virtual void ShowInfo() const = 0;
protected:
ShaderVariable(Kind kind)
: kind{ kind } {}
};
struct ShaderMathVariable : public ShaderVariable {
GLenum scalarType;
int arrayLength;
int width;
int height;
ShaderMathVariable()
: ShaderVariable(KD_Math) {}
virtual void ShowInfo() const override;
};
struct ShaderSamplerVariable : public ShaderVariable {
GLenum type;
int arrayLength;
ShaderSamplerVariable()
: ShaderVariable(KD_Sampler) {}
virtual void ShowInfo() const override;
};
struct ShaderThingId {
enum Kind {
KD_Input,
KD_Output,
KD_Uniform,
KD_Invalid,
};
Kind kind = KD_Invalid;
int index = 0;
bool IsValid() const;
};
struct ShaderInfo {
robin_hood::unordered_map<std::string, ShaderThingId, StringHash, StringEqual> things;
std::vector<ShaderMathVariable> inputs;
std::vector<ShaderMathVariable> outputs;
std::vector<std::unique_ptr<ShaderVariable>> uniforms;
GLuint FindInputLocation(Tags::VertexElementSemantic semantic);
GLuint FindOutputLocation(Tags::VertexElementSemantic semantic);
ShaderVariable* FindVariable(const ShaderThingId& thing);
};
class Shader : public RefCounted {
friend class IresShader;
private:
IresShader* mIres = nullptr;
ShaderInfo mInfo;
GLuint mProgram = 0;
public:
GLuint autofill_Transform = Tags::kInvalidLocation;
GLuint autofill_Time = Tags::kInvalidLocation;
GLuint autofill_DeltaTime = Tags::kInvalidLocation;
GLuint autofill_TextureAtlas = Tags::kInvalidLocation;
public:
Shader();
~Shader();
Shader(const Shader&) = delete;
Shader& operator=(const Shader&) = delete;
Shader(Shader&&) = default;
Shader& operator=(Shader&&) = default;
enum ErrorCode {
EC_Success,
/// Generated when Init*() functions are called on an already initialized Shader object.
EC_AlreadyInitialized,
/// Generated when the one-source-file text contains invalid or duplicate shader variants.
EC_InvalidShaderVariant,
EC_FileIoFailed,
EC_CompilationFailed,
EC_LinkingFailed,
};
struct ShaderSources {
std::string_view vertex;
std::string_view geometry;
std::string_view tessControl;
std::string_view tessEval;
std::string_view fragment;
};
/// Create shader by compiling each shader source file separately and then combining them together
/// into a Shader object.
ErrorCode InitFromSources(const ShaderSources& sources);
/// The given text will be split into different shader sections according to #type directives,
/// and combined to form a Shader object.
/// For OpenGL, this process involves compililng each section separately and then linking them
/// together.
///
/// There are a directive for each shader type
/// - `#type vertex`: Vertex shader
/// - `#type geometry`: Geometry shader
/// - `#type tessellation_control`: Tessellation control shader
/// - `#type tessellation_evaluation`: Tessellation evaluation shader
/// - `#type fragment`: Fragment shader
ErrorCode InitFromSource(std::string_view source);
/// Rebuild info object using OpenGL shader introspection API. Requires OpenGL 4.3 or above. Overrides existing info object.
bool GatherInfoShaderIntrospection();
const ShaderInfo& GetInfo() const { return mInfo; }
ShaderInfo& GetInfo() { return mInfo; }
/// If not empty, this name must not duplicate with any other shader object in the process.
GLuint GetProgram() const { return mProgram; }
IresShader* GetIres() const { return mIres; }
bool IsValid() const;
};
// Initialized in main()
inline RcPtr<Shader> gDefaultShader;
class IresShader : public IresObject {
private:
RcPtr<Shader> mInstance;
std::string mSourceFile;
public:
IresShader();
Shader* GetInstance() const;
void InvalidateInstance();
void ShowEditor(IEditor& editor) override;
void Write(IresWritingContext& ctx, rapidjson::Value& value, rapidjson::Document& root) const override;
void Read(IresLoadingContext& ctx, const rapidjson::Value& value) override;
};
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