Changeset: 8 Initial work on sprites and texture system

1 files changed, 55 insertions, 37 deletions

diff --git a/source/Texture.hpp b/source/Texture.hpp
index c330bb3..ef4d136 100644
--- a/source/Texture.hpp
+++ b/source/Texture.hpp
@@ -1,18 +1,28 @@
 #pragma once
 
+#include "GraphicsTags.hpp"
+#include "Image.hpp"
+#include "Ires.hpp"
 #include "RcPtr.hpp"
 
-#include <absl/container/flat_hash_map.h>
 #include <glad/glad.h>
+#include <cstdint>
 #include <glm/glm.hpp>
-#include <memory>
+#include <span>
 
 // TODO abstract texture traits such as component sizes from OpenGL
 
-class TextureInfo {
-public:
+struct Subregion {
+	float u0 = 0.0f;
+	float v0 = 0.0f;
+	float u1 = 0.0f;
+	float v1 = 0.0f;
+};
+
+struct TextureInfo {
 	glm::ivec2 size;
-	bool isAtlas = false;
+	Tags::TexFilter minifyingFilter = Tags::TF_Linear;
+	Tags::TexFilter magnifyingFilter = Tags::TF_Linear;
 };
 
 class Texture : public RefCounted {
@@ -31,18 +41,41 @@ public:
 	Texture(Texture&&) = default;
 	Texture& operator=(Texture&&) = default;
 
-	enum Filtering {
-		LinearFilter,
-		NearestFilter,
+	enum ErrorCode {
+		EC_Success,
+		EC_AlreadyInitialized,
+		EC_FileIoFailed,
+		EC_InvalidImage,
 	};
 
-	struct TextureProperties {
-		Filtering minifyingFilter = LinearFilter;
-		Filtering magnifyingFilter = LinearFilter;
+	ErrorCode InitFromFile(const char* filePath);
+	ErrorCode InitFromImage(const Image& image);
+
+	struct AtlasSource {
+		std::string name;
+		Image image;
 	};
 
-	bool InitFromFile(const char* filePath, const TextureProperties& props, bool flipVertically = false);
-	// bool InitFromImage(const Image& image, const TextureProperties& props, bool flipVertically = false);
+	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;
@@ -50,32 +83,17 @@ public:
 	bool IsValid() const;
 };
 
-/// A pure numerical subregion of a texture. u0/v0 are the UV coordinates of bottom left
-/// corner, and u1/v1 are the top left corner.
-struct Subregion {
-	/// Bottom left corner
-	float u0 = 0.0f;
-	float v0 = 0.0f;
-	/// Top right corner
-	float u1 = 0.0f;
-	float v1 = 0.0f;
-};
-
-/// A subregion of a specific texture.
-struct TextureSubregion : public Subregion {
-	RcPtr<Texture> atlasTexture;
-};
-
-class TextureManager {
+class IresTexture : public IresObject {
 public:
-	static inline TextureManager* instance = nullptr;
-
-private:
-	absl::flat_hash_map<std::string_view, RcPtr<Texture>> mTextures;
+	RcPtr<Texture> mInstance;
 
 public:
-	void DiscoverTextures();
+	IresTexture()
+		: IresObject(KD_Texture) {}
+
+	Texture* CreateInstance() const;
+	Texture* GetInstance();
 
-	const auto& GetTextures() const { return mTextures; }
-	Texture* FindTexture(std::string_view name);
+	void Write(rapidjson::Value& value, rapidjson::Document& root) const override;
+	void Read(const rapidjson::Value& value) override;
 };