From 17d5b091c9b2901ac96f5eee0da6af07228ae690 Mon Sep 17 00:00:00 2001
From: rtk0c <mail.tianyig@gmail.com>
Date: Sun, 10 Apr 2022 23:00:36 -0700
Subject: Changeset: 5 Add shader and corresponding editor components

---
 source/Shader.hpp | 101 +++++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 88 insertions(+), 13 deletions(-)

(limited to 'source/Shader.hpp')

diff --git a/source/Shader.hpp b/source/Shader.hpp
index e7a069b..8af5217 100644
--- a/source/Shader.hpp
+++ b/source/Shader.hpp
@@ -1,30 +1,102 @@
 #pragma once
 
 #include "EditorAttachment.hpp"
-#include "EditorInspector.hpp"
+#include "GraphicsTags.hpp"
 #include "RcPtr.hpp"
 
+#include <absl/container/flat_hash_map.h>
 #include <glad/glad.h>
-#include <tsl/array_map.h>
+#include <filesystem>
 #include <memory>
 #include <string_view>
+#include <vector>
 
-class ShaderDetails : public EditorAttachment, public IEditorInspectorTarget {
-public:
-	std::string fileName;
+// TODO move to variable after pattern matching is in the language
 
-public:
-	virtual void ShowInspector() override;
+struct ShaderVariable {
+	enum Kind {
+		KD_Math,
+		KD_Sampler,
+		KD_UniformBlock,
+	};
+
+	Kind kind;
+
+protected:
+	ShaderVariable(Kind kind)
+		: kind{ kind } {}
+};
+
+struct ShaderMathVariable : public ShaderVariable {
+	std::string name;
+	GLuint location;
+	GLenum scalarType;
+	int arrayLength;
+	int width;
+	int height;
+
+	ShaderMathVariable()
+		: ShaderVariable(KD_Math) {}
+};
+
+struct ShaderSamplerVariable : public ShaderVariable {
+	std::string name;
+	GLuint location;
+	GLenum type;
+	int arrayLength;
+
+	ShaderSamplerVariable()
+		: ShaderVariable(KD_Sampler) {}
+};
+
+struct ShaderUniformBlockVariable : public ShaderVariable {
+	std::string name;
+	/// Possible values: KD_Math
+	std::vector<std::unique_ptr<ShaderVariable>> items;
+	GLuint index;
+
+	ShaderUniformBlockVariable()
+		: ShaderVariable(KD_UniformBlock) {}
+};
+
+struct ShaderInfo {
+	enum ThingKind {
+		TKD_Input,
+		TKD_Output,
+		TKD_Uniform,
+		TKD_UniformBlock,
+	};
+
+	struct ThingId {
+		ThingKind kind;
+		int index;
+	};
+
+	struct InputOutputThing {
+		ShaderMathVariable variable;
+		Tags::VertexElementSemantic semantic = Tags::VES_Generic;
+	};
+
+	absl::flat_hash_map<std::string, ThingId> things;
+	std::vector<InputOutputThing> inputs;
+	std::vector<InputOutputThing> outputs;
+	/// Possible values: KD_Math, KD_Sampler
+	std::vector<std::unique_ptr<ShaderVariable>> uniforms;
+	std::vector<ShaderUniformBlockVariable> uniformBlocks;
+
+	bool SaveToFile(const std::filesystem::path& filePath) const;
+	bool LoadFromFile(const std::filesystem::path& filePath);
 };
 
 class Shader : public RefCounted {
 private:
-	std::unique_ptr<ShaderDetails> mDetails;
+	std::string mName;
+	std::unique_ptr<ShaderInfo> mInfo;
 	std::unique_ptr<EditorAttachment> mEditorAttachment;
 	GLuint mHandle = 0;
 
 public:
-	Shader() = default;
+	Shader(std::string name = "");
 	~Shader();
 	Shader(const Shader&) = delete;
 	Shader& operator=(const Shader&) = delete;
@@ -70,8 +142,11 @@ public:
 	EditorAttachment* GetEditorAttachment() const { return mEditorAttachment.get(); }
 	void SetEditorAttachment(EditorAttachment* attachment) { mEditorAttachment.reset(attachment); }
 
-	void GatherDetailsIfAbsent();
-	const ShaderDetails* GetDetails() const;
+	bool CreateEmptyInfoIfAbsent();
+	bool GatherInfoIfAbsent();
+	ShaderInfo* GetInfo() const;
+	/// If not empty, this name must not duplicate with any other shader object in the process.
+	const std::string& GetName() const;
 	GLuint GetProgram() const;
 
 	bool IsValid() const;
@@ -82,11 +157,11 @@ public:
 	static inline ShaderManager* instance = nullptr;
 
 private:
-	tsl::array_map<char, RcPtr<Shader>> mShaders;
+	absl::flat_hash_map<std::string_view, RcPtr<Shader>> mShaders;
 
 public:
 	void DiscoverShaders();
 
-	const tsl::array_map<char, RcPtr<Shader>>& GetShaders() const { return mShaders; }
+	const auto& GetShaders() const { return mShaders; }
 	Shader* FindShader(std::string_view name);
 };
-- 
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