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#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;
};
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