metalRenderTarget.h

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// SPDX-License-Identifier: Apache-2.0
// Copyright 2025-2026 Arnis Lektauers
//
// Created by Arnis Lektauers on 22.10.2025.
//
#pragma once
 
#include "Metal/Metal.hpp"
#include "platform/graphics/renderTarget.h"
 
namespace visutwin::canvas
{
    class MetalGraphicsDevice;

    class ColorAttachment {
    public:
        MTL::PixelFormat pixelFormat = MTL::PixelFormatInvalid;
 
        MTL::Texture* texture = nullptr;
 
        // Multi-sampled buffer
        MTL::Texture* multisampledBuffer = nullptr;
 
        ColorAttachment() = default;
        ~ColorAttachment() = default;
 
        void destroy();
    };

    class DepthAttachment {
    public:
        MTL::PixelFormat pixelFormat = MTL::PixelFormatInvalid;
 
        // True if the format has stencil
        bool hasStencil = false;
 
        // Depth texture
        MTL::Texture* depthTexture = nullptr;
 
        // True if the depthTexture is internally allocated / owned
        bool depthTextureInternal = false;
 
        // Multi-sampled depth buffer allocated over the user-provided depth buffer
        MTL::Texture* multisampledDepthBuffer = nullptr;
 
        explicit DepthAttachment(MTL::PixelFormat format, bool hasStencil);
 
        ~DepthAttachment() = default;
 
        // Destroy resources
        void destroy(MetalGraphicsDevice* device);
    };

    class MetalRenderTarget : public RenderTarget
    {
    public:
        explicit MetalRenderTarget(const RenderTargetOptions& options = {});
 
        virtual ~MetalRenderTarget();
 
        const std::vector<std::shared_ptr<ColorAttachment>>& colorAttachments() const { return _colorAttachments; }
        const std::shared_ptr<DepthAttachment>& depthAttachment() const { return _depthAttachment; }
        void ensureAttachments();
 
    private:
        void destroyFrameBuffers() override;
        void createFrameBuffers() override;
 
        std::vector<std::shared_ptr<ColorAttachment>> _colorAttachments;
        std::shared_ptr<DepthAttachment> _depthAttachment;
    };
}