// Copyright 2015 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#pragma once

#include <utility>

#include <glad/glad.h>

#include "common/common_types.h"

#include "video_core/renderer_opengl/gl_shader_util.h"
#include "video_core/renderer_opengl/gl_state.h"

class OGLTexture : private NonCopyable {
public:
    OGLTexture() = default;
    OGLTexture(OGLTexture&& o) { std::swap(handle, o.handle); }
    ~OGLTexture() { Release(); }
    OGLTexture& operator=(OGLTexture&& o) { std::swap(handle, o.handle); return *this; }

    /// Creates a new internal OpenGL resource and stores the handle
    void Create() {
        if (handle != 0) return;
        glGenTextures(1, &handle);
    }

    /// Deletes the internal OpenGL resource
    void Release() {
        if (handle == 0) return;
        glDeleteTextures(1, &handle);
        OpenGLState::ResetTexture(handle);
        handle = 0;
    }

    GLuint handle = 0;
};

class OGLSampler : private NonCopyable {
public:
    OGLSampler() = default;
    OGLSampler(OGLSampler&& o) { std::swap(handle, o.handle); }
    ~OGLSampler() { Release(); }
    OGLSampler& operator=(OGLSampler&& o) { std::swap(handle, o.handle); return *this; }

    /// Creates a new internal OpenGL resource and stores the handle
    void Create() {
        if (handle != 0) return;
        glGenSamplers(1, &handle);
    }

    /// Deletes the internal OpenGL resource
    void Release() {
        if (handle == 0) return;
        glDeleteSamplers(1, &handle);
        OpenGLState::ResetSampler(handle);
        handle = 0;
    }

    GLuint handle = 0;
};

class OGLShader : private NonCopyable {
public:
    OGLShader() = default;
    OGLShader(OGLShader&& o) { std::swap(handle, o.handle); }
    ~OGLShader() { Release(); }
    OGLShader& operator=(OGLShader&& o) { std::swap(handle, o.handle); return *this; }

    /// Creates a new internal OpenGL resource and stores the handle
    void Create(const char* vert_shader, const char* frag_shader) {
        if (handle != 0) return;
        handle = ShaderUtil::LoadShaders(vert_shader, frag_shader);
    }

    /// Deletes the internal OpenGL resource
    void Release() {
        if (handle == 0) return;
        glDeleteProgram(handle);
        OpenGLState::ResetProgram(handle);
        handle = 0;
    }

    GLuint handle = 0;
};

class OGLBuffer : private NonCopyable {
public:
    OGLBuffer() = default;
    OGLBuffer(OGLBuffer&& o) { std::swap(handle, o.handle); }
    ~OGLBuffer() { Release(); }
    OGLBuffer& operator=(OGLBuffer&& o) { std::swap(handle, o.handle); return *this; }

    /// Creates a new internal OpenGL resource and stores the handle
    void Create() {
        if (handle != 0) return;
        glGenBuffers(1, &handle);
    }

    /// Deletes the internal OpenGL resource
    void Release() {
        if (handle == 0) return;
        glDeleteBuffers(1, &handle);
        OpenGLState::ResetBuffer(handle);
        handle = 0;
    }

    GLuint handle = 0;
};

class OGLVertexArray : private NonCopyable {
public:
    OGLVertexArray() = default;
    OGLVertexArray(OGLVertexArray&& o) { std::swap(handle, o.handle); }
    ~OGLVertexArray() { Release(); }
    OGLVertexArray& operator=(OGLVertexArray&& o) { std::swap(handle, o.handle); return *this; }

    /// Creates a new internal OpenGL resource and stores the handle
    void Create() {
        if (handle != 0) return;
        glGenVertexArrays(1, &handle);
    }

    /// Deletes the internal OpenGL resource
    void Release() {
        if (handle == 0) return;
        glDeleteVertexArrays(1, &handle);
        OpenGLState::ResetVertexArray(handle);
        handle = 0;
    }

    GLuint handle = 0;
};

class OGLFramebuffer : private NonCopyable {
public:
    OGLFramebuffer() = default;
    OGLFramebuffer(OGLFramebuffer&& o) { std::swap(handle, o.handle); }
    ~OGLFramebuffer() { Release(); }
    OGLFramebuffer& operator=(OGLFramebuffer&& o) { std::swap(handle, o.handle); return *this; }

    /// Creates a new internal OpenGL resource and stores the handle
    void Create() {
        if (handle != 0) return;
        glGenFramebuffers(1, &handle);
    }

    /// Deletes the internal OpenGL resource
    void Release() {
        if (handle == 0) return;
        glDeleteFramebuffers(1, &handle);
        OpenGLState::ResetFramebuffer(handle);
        handle = 0;
    }

    GLuint handle = 0;
};
