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#pragma once
#include "RcPtr.hpp"
#include <absl/container/flat_hash_map.h>
#include <glad/glad.h>
#include <glm/glm.hpp>
#include <memory>
// TODO abstract texture traits such as component sizes from OpenGL
class TextureInfo {
public:
glm::ivec2 size;
bool isAtlas = false;
};
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 Filtering {
LinearFilter,
NearestFilter,
};
struct TextureProperties {
Filtering minifyingFilter = LinearFilter;
Filtering magnifyingFilter = LinearFilter;
};
bool InitFromFile(const char* filePath, const TextureProperties& props, bool flipVertically = false);
// bool InitFromImage(const Image& image, const TextureProperties& props, bool flipVertically = false);
const TextureInfo& GetInfo() const;
GLuint GetHandle() const;
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 {
public:
static inline TextureManager* instance = nullptr;
private:
absl::flat_hash_map<std::string_view, RcPtr<Texture>> mTextures;
public:
void DiscoverTextures();
const auto& GetTextures() const { return mTextures; }
Texture* FindTexture(std::string_view name);
};
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