TexgenNode.hpp

#pragma once
 
#include <Gfx/Graph/Node.hpp>
#include <Gfx/Graph/NodeRenderer.hpp>
#include <Gfx/Graph/RenderList.hpp>
#include <Gfx/Graph/RenderState.hpp>
#include <Gfx/Graph/Uniforms.hpp>
 
namespace score::gfx
{
 
struct TexgenNode : NodeModel
{
  static const constexpr auto vertex = R"_(#version 450
  layout(location = 0) in vec2 position;
  layout(location = 1) in vec2 texcoord;
 
  layout(binding = 3) uniform sampler2D y_tex;
  layout(location = 0) out vec2 v_texcoord;
 
  layout(std140, binding = 0) uniform renderer_t {
    mat4 clipSpaceCorrMatrix;
    vec2 renderSize;
  } renderer;
 
  out gl_PerVertex { vec4 gl_Position; };
 
  void main()
  {
    v_texcoord = texcoord;
    gl_Position = renderer.clipSpaceCorrMatrix * vec4(position.xy, 0.0, 1.);
  }
  )_";
 
  static const constexpr auto filter = R"_(#version 450
  layout(location = 0) in vec2 v_texcoord;
  layout(location = 0) out vec4 fragColor;
 
  layout(std140, binding = 0) uniform renderer_t {
  mat4 clipSpaceCorrMatrix;
  vec2 renderSize;
  } renderer;
 
  layout(binding=3) uniform sampler2D y_tex;
 
 
  void main ()
  {
    fragColor = texture(y_tex, v_texcoord);
  }
  )_";
 
  struct ubo
  {
    int currentImageIndex{};
    float pad;
    float position[2];
  } ubo;
 
  struct Rendered : GenericNodeRenderer
  {
    using GenericNodeRenderer::GenericNodeRenderer;
 
    ~Rendered() { }
 
    QRhiTexture* texture{};
    void init(RenderList& renderer, QRhiResourceUpdateBatch& res) override
    {
      const auto& mesh = renderer.defaultTriangle();
      defaultMeshInit(renderer, mesh, res);
      processUBOInit(renderer);
      m_material.init(renderer, node.input, m_samplers);
      std::tie(m_vertexS, m_fragmentS)
          = score::gfx::makeShaders(renderer.state, vertex, filter);
 
      auto& n = static_cast<const TexgenNode&>(this->node);
      auto& rhi = *renderer.state.rhi;
      {
        texture
            = rhi.newTexture(QRhiTexture::RGBA8, n.image.size(), 1, QRhiTexture::Flag{});
 
        texture->create();
      }
 
      {
        auto sampler = rhi.newSampler(
            QRhiSampler::Linear, QRhiSampler::Linear, QRhiSampler::None,
            QRhiSampler::ClampToEdge, QRhiSampler::ClampToEdge);
 
        sampler->create();
        m_samplers.push_back({sampler, texture});
      }
      defaultPassesInit(renderer, mesh);
    }
 
    void update(RenderList& renderer, QRhiResourceUpdateBatch& res) override
    {
      defaultUBOUpdate(renderer, res);
      auto& n = static_cast<const TexgenNode&>(this->node);
      if(func_t f = n.function.load())
      {
        f(const_cast<uchar*>(n.image.bits()), n.image.width(), n.image.height(), t++);
        res.uploadTexture(texture, n.image);
      }
    }
 
    void release(RenderList& r) override
    {
      texture->deleteLater();
      texture = nullptr;
 
      defaultRelease(r);
    }
 
    int t = 0;
  };
 
  QImage image;
  TexgenNode()
  {
    image = QImage{QSize(640, 480), QImage::Format_ARGB32_Premultiplied};
    output.push_back(new Port{this, {}, Types::Image, {}});
  }
  virtual ~TexgenNode()
  {
    m_materialData.release();
  }
 
  using func_t = void (*)(unsigned char* rgb, int width, int height, int t);
  std::atomic<func_t> function{};
 
  score::gfx::NodeRenderer* createRenderer(RenderList& r) const noexcept override
  {
    return new Rendered{*this};
  }
};
 
 
}