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Confirmed performance improvement without glBufferSubData

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Bruno
2021-08-01 16:43:25 +02:00
parent 48f92bc52b
commit 8002f3164c
2 changed files with 20 additions and 16 deletions
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10
MediaPlayer.cpp
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@@ -812,19 +812,21 @@ void MediaPlayer::fill_texture(guint index)
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, media_.width, media_.height, GL_RGBA, GL_UNSIGNED_BYTE, 0);
// bind the next PBO to write pixels
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, pbo_[pbo_next_index_]);
#ifdef USE_GL_BUFFER_SUBDATA
glBufferSubData(GL_PIXEL_UNPACK_BUFFER, 0, pbo_size_, frame_[index].vframe.data[0]);
#else
// update data directly on the mapped buffer
// NB : equivalent but faster than glBufferSubData (memmove instead of memcpy ?)
// See http://www.songho.ca/opengl/gl_pbo.html#map for more details
glBufferData(GL_PIXEL_UNPACK_BUFFER, pbo_size_, 0, GL_STREAM_DRAW);
// map the buffer object into client's memory
GLubyte* ptr = (GLubyte*) glMapBuffer(GL_PIXEL_UNPACK_BUFFER, GL_WRITE_ONLY);
if (ptr) {
// update data directly on the mapped buffer
// NB : equivalent but faster (memmove instead of memcpy ?) than
// glNamedBufferSubData(pboIds[nextIndex], 0, imgsize, vp->getBuffer())
memmove(ptr, frame_[index].vframe.data[0], pbo_size_);
// release pointer to mapping buffer
glUnmapBuffer(GL_PIXEL_UNPACK_BUFFER);
}
#endif
// done with PBO
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
}

10
Stream.cpp
View File

@@ -474,19 +474,21 @@ void Stream::fill_texture(guint index)
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width_, height_, GL_RGBA, GL_UNSIGNED_BYTE, 0);
// bind the next PBO to write pixels
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, pbo_[pbo_next_index_]);
#ifdef USE_GL_BUFFER_SUBDATA
glBufferSubData(GL_PIXEL_UNPACK_BUFFER, 0, pbo_size_, frame_[index].vframe.data[0]);
#else
// update data directly on the mapped buffer
// NB : equivalent but faster than glBufferSubData (memmove instead of memcpy ?)
// See http://www.songho.ca/opengl/gl_pbo.html#map for more details
glBufferData(GL_PIXEL_UNPACK_BUFFER, pbo_size_, 0, GL_STREAM_DRAW);
// map the buffer object into client's memory
GLubyte* ptr = (GLubyte*) glMapBuffer(GL_PIXEL_UNPACK_BUFFER, GL_WRITE_ONLY);
if (ptr) {
// update data directly on the mapped buffer
// NB : equivalent but faster (memmove instead of memcpy ?) than
// glNamedBufferSubData(pboIds[nextIndex], 0, imgsize, vp->getBuffer())
memmove(ptr, frame_[index].vframe.data[0], pbo_size_);
// release pointer to mapping buffer
glUnmapBuffer(GL_PIXEL_UNPACK_BUFFER);
}
#endif
// done with PBO
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
}