IRenderViewToTexture.h

/*
 * AUI Framework - Declarative UI toolkit for modern C++20
 * Copyright (C) 2020-2025 Alex2772 and Contributors
 *
 * SPDX-License-Identifier: MPL-2.0
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */
 
#pragma once
 
#include <glm/glm.hpp>
#include <AUI/Common/AStaticVector.h>
#include <AUI/Geometry2D/ARect.h>
#include <AUI/Render/ARenderContext.h>
 
class IRenderer;
class AView;

class IRenderViewToTexture {
public:

   struct InvalidArea {
       struct Empty {};

       struct Full {};

       using Rectangles = AStaticVector<ARect<int>, ARenderContext::Rectangles::capacity() - 1>;
 
       using Underlying = std::variant<Empty, Rectangles, Full>;
 
       template<aui::convertible_to<Underlying> F>
       InvalidArea(F&& u) noexcept: mUnderlying(std::forward<F>(u)) {}
       InvalidArea() noexcept: mUnderlying(Empty{}) {}
 
 
       [[nodiscard]]
       bool empty() const noexcept {
           return std::holds_alternative<Empty>(mUnderlying);
       }
 
       [[nodiscard]]
       bool full() const noexcept {
           return std::holds_alternative<Full>(mUnderlying);
       }

       void addRectangle(ARect<int> rhs);
 
       Rectangles* rectangles() noexcept {
           return std::get_if<Rectangles>(&mUnderlying);
       }
 
       const Rectangles* rectangles() const noexcept {
           return std::get_if<Rectangles>(&mUnderlying);
       }
 
   private:
       Underlying mUnderlying;
   };
 
 
 

   virtual bool begin(IRenderer& renderer, glm::ivec2 surfaceSize, IRenderViewToTexture::InvalidArea& invalidArea) = 0;

   virtual void end(IRenderer& renderer) = 0;

   virtual void draw(IRenderer& renderer) = 0;
 
   virtual ~IRenderViewToTexture() = default;
 
   static void enableForView(IRenderer& renderer, AView& view);
   static void disableForView(AView& view);
 
   [[nodiscard]]
   static bool isEnabledForView(AView& view);
};

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