NV12ExternalOES.hpp

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#pragma once
 
#include <Gfx/Graph/decoders/GPUVideoDecoder.hpp>
 
#include <score_plugin_gfx_export.h>
 
#include <QFile>
 
extern "C" {
#include <libavformat/avformat.h>
}
 
namespace score::gfx
{
 
SCORE_PLUGIN_GFX_EXPORT
bool nv12ExternalOesUsable(QRhi::Implementation backend) noexcept;
 
QByteArray toExternalSamplerEssl(QByteArray glsl);
 
struct NV12ExternalOESDecoder : GPUVideoDecoder
{
  // Baked with sampler2D so glslang accepts it; the GLSL variant is swapped
  // below. The sampler already returns RGB, so the only work here is the
  // optional user filter.
  static const constexpr auto oes_filter = R"_(#version 450
 
)_" SCORE_GFX_VIDEO_UNIFORMS R"_(
 
    layout(binding=3) uniform sampler2D tex;
 
    layout(location = 0) in vec2 v_texcoord;
    layout(location = 0) out vec4 fragColor;
 
    vec4 processTexture(vec4 t) {
      vec4 processed = t;
      { %1 }
      return processed;
    }
 
    void main ()
    {
      fragColor = processTexture(texture(tex, v_texcoord));
    })_";
 
  explicit NV12ExternalOESDecoder(Video::ImageFormat& d, QString f = "")
      : decoder{d}
      , filter{std::move(f)}
  {
  }
 
  Video::ImageFormat& decoder;
  QString filter;
 
  std::pair<QShader, QShader> init(RenderList& r) override;
 
  void exec(RenderList&, QRhiResourceUpdateBatch&, AVFrame&) override { }
};
 
}