Canvas.h

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#pragma once
 
#include "graphics/Canvas.h"
#include "graphics/Texture.h"
#include "graphics/vulkan/Graphics.h"
#include "vkbuilder.hpp"
#include <memory>
#include <optional>
#include <vector>
#include <cstdint>
 
namespace eve::graphics::vulkan {
 
class OffscreenCanvas final : public eve::graphics::Canvas {
public:
    OffscreenCanvas(Graphics *owner, int width, int height);
    ~OffscreenCanvas() override;
 
    int getWidth() const override { return width; }
    int getHeight() const override { return height; }
    Texture *getTexture() override { return &sampleTexture; }
 
    void clear(std::optional<Color> color, std::optional<int> stencil,
               std::optional<double> depth) override;
    Color getPixel(int x, int y) override;
    image::ImageData *newImageData() override;
 
    void draw(eve::graphics::Graphics *, const glm::mat4 &) const override {}
    void draw(Canvas *, const glm::mat4 &) const override {}
 
    vk::Framebuffer framebuffer() const { return fb; }
    vk::Framebuffer framebuffer3D() const { return fb3D; }
    vkb::ColorAttachmentImage &colorImage() { return color; }
    vkb::DepthTarget &depthImage() { return depth; }
    Color pendingClearColor() const { return clearColor; }
    bool takePendingClear();
 
    void ensure3D();
 
private:
    void readAllPixels(std::vector<uint8_t> &outRgba);
 
    Graphics *owner = nullptr;
    int width = 0;
    int height = 0;
    vkb::ColorAttachmentImage color;
    vk::Framebuffer fb = nullptr;
    vkb::DepthTarget depth;
    vk::Framebuffer fb3D = nullptr;
    GpuTexture sampleGpu;
    Texture sampleTexture;
 
    Color clearColor{0.f, 0.f, 0.f, 1.f};
    bool hasPendingClear = true;
};
 
}  // namespace eve::graphics::vulkan