axmol/core/renderer/backend/opengl/DeviceGL.h

/****************************************************************************
 Copyright (c) 2018-2019 Xiamen Yaji Software Co., Ltd.

 https://axmolengine.github.io/

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 of this software and associated documentation files (the "Software"), to deal
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 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

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 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 THE SOFTWARE.
 ****************************************************************************/
#pragma once

#include "../Device.h"
#include "platform/GL.h"
#include "OpenGLState.h"

NS_AX_BACKEND_BEGIN
/**
 * @addtogroup _opengl
 * @{
 */

/**
 * Use to create resoureces.
 */
class DeviceGL : public Device
{
public:
    DeviceGL();
    ~DeviceGL();

    GLint getDefaultFBO() const;

    /**
     * New a CommandBuffer object, not auto released.
     * @return A CommandBuffer object.
     */
    virtual CommandBuffer* newCommandBuffer() override;

    /**
     * New a Buffer object, not auto released.
     * @param size Specifies the size in bytes of the buffer object's new data store.
     * @param type Specifies the target buffer object. The symbolic constant must be BufferType::VERTEX or
     * BufferType::INDEX.
     * @param usage Specifies the expected usage pattern of the data store. The symbolic constant must be
     * BufferUsage::STATIC, BufferUsage::DYNAMIC.
     * @return A Buffer object.
     */
    virtual Buffer* newBuffer(std::size_t size, BufferType type, BufferUsage usage) override;

    /**
     * New a TextureBackend object, not auto released.
     * @param descriptor Specifies texture description.
     * @return A TextureBackend object.
     */
    virtual TextureBackend* newTexture(const TextureDescriptor& descriptor) override;

    RenderTarget* newDefaultRenderTarget(TargetBufferFlags rtf) override;
    RenderTarget* newRenderTarget(TargetBufferFlags rtf,
                                  TextureBackend* colorAttachment,
                                  TextureBackend* depthAttachment,
                                  TextureBackend* stencilAttachhment) override;

    virtual DepthStencilState* newDepthStencilState() override;

    /**
     * New a RenderPipeline object, not auto released.
     * @param descriptor Specifies render pipeline description.
     * @return A RenderPipeline object.
     */
    virtual RenderPipeline* newRenderPipeline() override;

    /**
     * Design for metal.
     */
    virtual void setFrameBufferOnly(bool frameBufferOnly) override {}

    /**
     * New a Program, not auto released.
     * @param vertexShader Specifes this is a vertex shader source.
     * @param fragmentShader Specifes this is a fragment shader source.
     * @return A Program instance.
     */
    virtual Program* newProgram(std::string_view vertexShader, std::string_view fragmentShader) override;

    void resetState() override;

protected:
    /**
     * New a shaderModule, not auto released.
     * @param stage Specifies whether is vertex shader or fragment shader.
     * @param source Specifies shader source.
     * @return A ShaderModule object.
     */
    virtual ShaderModule* newShaderModule(ShaderStage stage, std::string_view source) override;

    GLint _defaultFBO = 0;  // The value gets from glGetIntegerv, so need to use GLint
    GLuint _defaultVAO = 0;
};
// end of _opengl group
/// @}
NS_AX_BACKEND_END