1 files changed, 99 insertions, 0 deletions
diff --git a/ProjectBrussel/Game/Texture.hpp b/ProjectBrussel/Game/Texture.hpp
new file mode 100644
index 0000000..108dfa7
--- /dev/null
+++ b/ProjectBrussel/Game/Texture.hpp
@@ -0,0 +1,99 @@
+#pragma once
+
+#include "GraphicsTags.hpp"
+#include "Image.hpp"
+#include "Ires.hpp"
+#include "RcPtr.hpp"
+
+#include <glad/glad.h>
+#include <cstdint>
+#include <glm/glm.hpp>
+#include <span>
+
+// TODO abstract texture traits such as component sizes from OpenGL
+
+struct Subregion {
+	float u0 = 0.0f;
+	float v0 = 0.0f;
+	float u1 = 0.0f;
+	float v1 = 0.0f;
+};
+
+struct TextureInfo {
+	glm::ivec2 size;
+	Tags::TexFilter minifyingFilter = Tags::TF_Linear;
+	Tags::TexFilter magnifyingFilter = Tags::TF_Linear;
+};
+
+class Texture : public RefCounted {
+	friend class TextureStitcher;
+
+private:
+	TextureInfo mInfo;
+	GLuint mHandle = 0;
+
+public:
+	Texture() = default;
+	~Texture();
+
+	Texture(const Texture&) = delete;
+	Texture& operator=(const Texture&) = delete;
+	Texture(Texture&&) = default;
+	Texture& operator=(Texture&&) = default;
+
+	enum ErrorCode {
+		EC_Success,
+		EC_AlreadyInitialized,
+		EC_FileIoFailed,
+		EC_InvalidImage,
+	};
+
+	ErrorCode InitFromFile(const char* filePath);
+	ErrorCode InitFromImage(const Image& image);
+
+	struct AtlasSource {
+		std::string name;
+		Image image;
+	};
+
+	struct AltasElement {
+		std::string name;
+		Subregion subregion;
+		glm::ivec2 subregionSize;
+	};
+
+	enum PackingMode {
+		PM_KeepSquare,
+		PM_VerticalExtension,
+		PM_HorizontalExtension,
+	};
+
+	struct AtlasInput {
+		std::span<AtlasSource> sources;
+		PackingMode packingMode;
+	};
+	struct AtlasOutput {
+		std::vector<AltasElement> elements;
+	};
+	ErrorCode InitAtlas(const AtlasInput& in, AtlasOutput* out = nullptr);
+
+	const TextureInfo& GetInfo() const;
+	GLuint GetHandle() const;
+
+	bool IsValid() const;
+};
+
+class IresTexture : public IresObject {
+public:
+	RcPtr<Texture> mInstance;
+
+public:
+	IresTexture()
+		: IresObject(KD_Texture) {}
+
+	Texture* CreateInstance() const;
+	Texture* GetInstance();
+
+	void Write(IresWritingContext& ctx, rapidjson::Value& value, rapidjson::Document& root) const override;
+	void Read(IresLoadingContext& ctx, const rapidjson::Value& value) override;
+};