axmol/core/renderer/backend/metal/ProgramMTL.h

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

 https://axmolengine.github.io/

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#pragma once

#include "../Program.h"
#import <Metal/Metal.h>

NS_AX_BACKEND_BEGIN

class ShaderModuleMTL;

/**
 * @addtogroup _metal
 * @{
 */

/**
 * A metal Program
 */
class ProgramMTL : public Program
{
public:
    /// @name Constructor, Destructor and Initializers
    /**
     * @param vertexShader Specifes the vertex shader source.
     * @param fragmentShader Specifes the fragment shader source.
     */
    ProgramMTL(std::string_view vertexShader, std::string_view fragmentShader);
    virtual ~ProgramMTL();

    /**
     * Get uniform location by name.
     * @param uniform Specifies the uniform name.
     * @return The uniform location.
     */
    virtual UniformLocation getUniformLocation(std::string_view uniform) const override;

    /**
     * Get uniform location by engine built-in uniform enum name.
     * @param name Specifies the engine built-in uniform enum name.
     * @return The uniform location.
     */
    virtual UniformLocation getUniformLocation(backend::Uniform name) const override;

    /**
     * Get attribute location by attribute name.
     * @param name Specifies the attribute name.
     * @return The attribute location.
     */
    virtual int getAttributeLocation(std::string_view name) const override;

    /**
     * Get attribute location by engine built-in attribute enum name.
     * @param name Specifies the engine built-in attribute enum name.
     * @return The attribute location.
     */
    virtual int getAttributeLocation(Attribute name) const override;

    /**
     * Get vertex shader module.
     * @return Vertex shader module.
     */
    virtual ShaderModuleMTL* getVertexShader() const { return _vertexShader; }

    /**
     * Get fragment shader module.
     * @ Fragment shader module.
     */
    virtual ShaderModuleMTL* getFragmentShader() const { return _fragmentShader; }

    /**
     * Get active vertex attributes.
     * @return Active vertex attributes. key is active attribute name, Value is corresponding attribute info.
     */
    const hlookup::string_map<AttributeBindInfo>& getActiveAttributes() const override;

    /**
     * Get maximum vertex location.
     * @return Maximum vertex locaiton.
     */
    virtual int getMaxVertexLocation() const override;

    /**
     * Get maximum fragment location.
     * @return Maximum fragment location.
     */
    virtual int getMaxFragmentLocation() const override;

    /**
     * Get uniform buffer size in bytes that can hold all the uniforms.
     * @param stage Specifies the shader stage. The symbolic constant can be either VERTEX or FRAGMENT.
     * @return The uniform buffer size in bytes.
     */
    virtual std::size_t getUniformBufferSize(ShaderStage stage) const override;

    /**
     * Get a uniformInfo in given location from the specific shader stage.
     * @param stage Specifies the shader stage. The symbolic constant can be either VERTEX or FRAGMENT.
     * @param location Specifies the uniform locaion.
     * @return The uniformInfo.
     */
    virtual const UniformInfo& getActiveUniformInfo(ShaderStage stage, int location) const override;

    /**
     * Get all uniformInfos.
     * @return The uniformInfos.
     */
    virtual const hlookup::string_map<UniformInfo>& getAllActiveUniformInfo(ShaderStage stage) const override;

private:
    ShaderModuleMTL* _vertexShader   = nullptr;
    ShaderModuleMTL* _fragmentShader = nullptr;
};

// end of _metal group
/// @}
NS_AX_BACKEND_END