GLCaptureUpload.hpp

Go to the documentation of this file.

#pragma once
 
#include <Gfx/Graph/interop/CaptureStrategyCommon.hpp>
 
#include <QtGui/private/qrhigles2_p.h>
 
#include <QOpenGLContext>
#include <QOpenGLExtraFunctions>
 
#include <cstdint>
 
// GL_BGRA is desktop-GL only. On an OpenGL ES build -- which is what Tegra and
// most embedded targets use -- the same token is GL_BGRA_EXT, from
// GL_EXT_texture_format_BGRA8888. Without this the whole gfx plugin fails to
// compile for GLES rather than merely lacking the BGRA fast path.
#if !defined(GL_BGRA) && defined(GL_BGRA_EXT)
#define GL_BGRA GL_BGRA_EXT
#endif
 
namespace score::gfx::interop
{
 
inline void uploadClientToGLTexture(
    QOpenGLContext& glctx, QRhiTexture& outTex, const void* src,
    bool bgra) noexcept
{
  if(!src)
    return;
  const auto nt = outTex.nativeTexture();
  if(!nt.object)
    return;
  auto* f = glctx.extraFunctions();
  if(!f)
    return;
 
  const auto sz = outTex.pixelSize();
  const GLenum fmt = bgra ? GL_BGRA : GL_RGBA;
  f->glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
  f->glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
  f->glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
  f->glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
  f->glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
  f->glBindTexture(GL_TEXTURE_2D, static_cast<GLuint>(nt.object));
  f->glTexSubImage2D(
      GL_TEXTURE_2D, 0, 0, 0, sz.width(), sz.height(), fmt, GL_UNSIGNED_BYTE,
      src);
  f->glBindTexture(GL_TEXTURE_2D, 0);
}
 
inline void uploadGLBufferToGLTexture(
    QOpenGLContext& glctx, QRhiTexture& outTex, std::uint32_t srcGlBuffer,
    bool bgra) noexcept
{
  if(!srcGlBuffer)
    return;
  const auto nt = outTex.nativeTexture();
  if(!nt.object)
    return;
  auto* f = glctx.extraFunctions();
  if(!f)
    return;
 
  const auto sz = outTex.pixelSize();
  const GLenum fmt = bgra ? GL_BGRA : GL_RGBA;
  // The storage buffer can be bound to GL_PIXEL_UNPACK_BUFFER even though it
  // was allocated for GL_SHADER_STORAGE_BUFFER: both are server-side memory;
  // the binding target picks the usage, not the storage type.
  f->glBindBuffer(GL_PIXEL_UNPACK_BUFFER, srcGlBuffer);
  f->glBindTexture(GL_TEXTURE_2D, static_cast<GLuint>(nt.object));
  f->glTexSubImage2D(
      GL_TEXTURE_2D, 0, 0, 0, sz.width(), sz.height(), fmt, GL_UNSIGNED_BYTE,
      nullptr);
  f->glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
  f->glBindTexture(GL_TEXTURE_2D, 0);
}
 
} // namespace score::gfx::interop