SL.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 "AUI/Enum/ImageRendering.h"
#include "AUI/Image/AImage.h"
#include "glm/common.hpp"
#include "glm/ext/quaternion_common.hpp"
#include "glm/fwd.hpp"
#include <glm/glm.hpp>
#include <AUI/Render/ITexture.h>
 
namespace aui::sl_gen {
   struct Texture2D {
   public:
       Texture2D(AImageView texture, ImageRendering imageRendering) noexcept: mTexture(texture), mImageRendering(imageRendering) {}
       Texture2D(AImageView texture) noexcept: Texture2D(texture, ImageRendering::PIXELATED) {}
 
       glm::vec4 operator[](glm::vec2 uv) const {
           switch (mImageRendering) {
               case ImageRendering::PIXELATED:
                   return clamped(glm::ivec2(uv * glm::vec2(mTexture.size())));
               case ImageRendering::SMOOTH: {
                   const auto pos = glm::ivec2(uv * glm::vec2(mTexture.size()));
                   const auto texelSize = glm::vec2(1.f) / glm::vec2(mTexture.size());
                   const auto topLeft = clamped(pos);
                   const auto topRight = clamped(pos + glm::ivec2(1, 0));
                   const auto bottomLeft = clamped(pos + glm::ivec2(0, 1));
                   const auto bottomRight = clamped(pos + glm::ivec2(1, 1));
                   const auto texelSpaceUv = glm::mod(uv, texelSize) / texelSize;
 
                   const auto top = glm::mix(topLeft, topRight, texelSpaceUv.x);
                   const auto bottom = glm::mix(bottomLeft, bottomRight, texelSpaceUv.x);
                   return glm::mix(top, bottom, texelSpaceUv.y);
               }
           }
           return {};
       }
 
   private:
       glm::vec4 clamped(glm::ivec2 pos) const noexcept {
           return mTexture.get(glm::clamp(pos, glm::ivec2(0), glm::ivec2(mTexture.size()) - 1));
       }
       AImageView mTexture;
       ImageRendering mImageRendering;
   };
}
 
   inline glm::vec2 gl_SamplePosition = {0, 0};
 

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