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

#include <utility>
#include <glad/glad.h>
#include "common/common_types.h"
#include "video_core/renderer_opengl/gl_resource_manager.h"
#include "video_core/renderer_opengl/gl_shader_util.h"
#include "video_core/renderer_opengl/gl_state.h"

namespace OpenGL {

void OGLTexture::Create() {
    if (handle != 0)
        return;
    glGenTextures(1, &handle);
}

void OGLTexture::Release() {
    if (handle == 0)
        return;
    glDeleteTextures(1, &handle);
    OpenGLState::GetCurState().UnbindTexture(handle).Apply();
    handle = 0;
}

void OGLSampler::Create() {
    if (handle != 0)
        return;
    glGenSamplers(1, &handle);
}

void OGLSampler::Release() {
    if (handle == 0)
        return;
    glDeleteSamplers(1, &handle);
    OpenGLState::GetCurState().ResetSampler(handle).Apply();
    handle = 0;
}

void OGLShader::Create(const char* source, GLenum type) {
    if (handle != 0)
        return;
    if (source == nullptr)
        return;
    handle = GLShader::LoadShader(source, type);
}

void OGLShader::Release() {
    if (handle == 0)
        return;
    glDeleteShader(handle);
    handle = 0;
}

void OGLProgram::CreateFromSource(const char* vert_shader, const char* geo_shader,
                                  const char* frag_shader, bool separable_program) {
    OGLShader vert, geo, frag;
    if (vert_shader)
        vert.Create(vert_shader, GL_VERTEX_SHADER);
    if (geo_shader)
        geo.Create(geo_shader, GL_GEOMETRY_SHADER);
    if (frag_shader)
        frag.Create(frag_shader, GL_FRAGMENT_SHADER);
    Create(separable_program, vert.handle, geo.handle, frag.handle);
}

void OGLProgram::Release() {
    if (handle == 0)
        return;
    glDeleteProgram(handle);
    OpenGLState::GetCurState().ResetProgram(handle).Apply();
    handle = 0;
}

void OGLPipeline::Create() {
    if (handle != 0)
        return;
    glGenProgramPipelines(1, &handle);
}

void OGLPipeline::Release() {
    if (handle == 0)
        return;
    glDeleteProgramPipelines(1, &handle);
    OpenGLState::GetCurState().ResetPipeline(handle).Apply();
    handle = 0;
}

void OGLBuffer::Create() {
    if (handle != 0)
        return;
    glGenBuffers(1, &handle);
}

void OGLBuffer::Release() {
    if (handle == 0)
        return;
    glDeleteBuffers(1, &handle);
    OpenGLState::GetCurState().ResetBuffer(handle).Apply();
    handle = 0;
}

void OGLSync::Create() {
    if (handle != 0)
        return;
    handle = glFenceSync(GL_SYNC_GPU_COMMANDS_COMPLETE, 0);
}

void OGLSync::Release() {
    if (handle == 0)
        return;
    glDeleteSync(handle);
    handle = 0;
}

void OGLVertexArray::Create() {
    if (handle != 0)
        return;
    glGenVertexArrays(1, &handle);
}

void OGLVertexArray::Release() {
    if (handle == 0)
        return;
    glDeleteVertexArrays(1, &handle);
    OpenGLState::GetCurState().ResetVertexArray(handle).Apply();
    handle = 0;
}

void OGLFramebuffer::Create() {
    if (handle != 0)
        return;
    glGenFramebuffers(1, &handle);
}

void OGLFramebuffer::Release() {
    if (handle == 0)
        return;
    glDeleteFramebuffers(1, &handle);
    OpenGLState::GetCurState().ResetFramebuffer(handle).Apply();
    handle = 0;
}

} // namespace OpenGL