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Use utility framebuffer in ViewDoneWritingSimulatorWorkaround

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This code needs a FBO to bind the texture.

Fixes invalid results when running under simulator.

PiperOrigin-RevId: 499241867
This commit is contained in:
Camillo Lugaresi 2023-01-03 09:34:21 -08:00 committed by Copybara-Service
parent 9252a025e5
commit 2f4bb5d545
1 changed files with 42 additions and 33 deletions
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25
mediapipe/gpu/gpu_buffer_storage_cv_pixel_buffer.cc
View File

@ -74,6 +74,9 @@ GlTextureView GpuBufferStorageCvPixelBuffer::GetReadView(
static void ViewDoneWritingSimulatorWorkaround(CVPixelBufferRef pixel_buffer,
const GlTextureView& view) {
CHECK(pixel_buffer);
auto ctx = GlContext::GetCurrent().get();
if (!ctx) ctx = view.gl_context();
ctx->Run([pixel_buffer, &view, ctx] {
CVReturn err = CVPixelBufferLockBaseAddress(pixel_buffer, 0);
CHECK(err == kCVReturnSuccess)
<< "CVPixelBufferLockBaseAddress failed: " << err;
@ -82,34 +85,40 @@ static void ViewDoneWritingSimulatorWorkaround(CVPixelBufferRef pixel_buffer,
uint8_t* pixel_ptr =
static_cast<uint8_t*>(CVPixelBufferGetBaseAddress(pixel_buffer));
if (pixel_format == kCVPixelFormatType_32BGRA) {
// TODO: restore previous framebuffer? Move this to helper so we
// can use BindFramebuffer?
glBindFramebuffer(GL_FRAMEBUFFER, kUtilityFramebuffer.Get(*ctx));
glViewport(0, 0, view.width(), view.height());
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, view.target(),
view.name(), 0);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
view.target(), view.name(), 0);
size_t contiguous_bytes_per_row = view.width() * 4;
if (bytes_per_row == contiguous_bytes_per_row) {
glReadPixels(0, 0, view.width(), view.height(), GL_BGRA, GL_UNSIGNED_BYTE,
pixel_ptr);
glReadPixels(0, 0, view.width(), view.height(), GL_BGRA,
GL_UNSIGNED_BYTE, pixel_ptr);
} else {
// TODO: use GL_PACK settings for row length. We can expect
// GLES 3.0 on iOS now.
std::vector<uint8_t> contiguous_buffer(contiguous_bytes_per_row *
view.height());
uint8_t* temp_ptr = contiguous_buffer.data();
glReadPixels(0, 0, view.width(), view.height(), GL_BGRA, GL_UNSIGNED_BYTE,
temp_ptr);
glReadPixels(0, 0, view.width(), view.height(), GL_BGRA,
GL_UNSIGNED_BYTE, temp_ptr);
for (int i = 0; i < view.height(); ++i) {
memcpy(pixel_ptr, temp_ptr, contiguous_bytes_per_row);
temp_ptr += contiguous_bytes_per_row;
pixel_ptr += bytes_per_row;
}
}
// TODO: restore previous framebuffer?
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
view.target(), 0, 0);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
} else {
LOG(ERROR) << "unsupported pixel format: " << pixel_format;
}
err = CVPixelBufferUnlockBaseAddress(pixel_buffer, 0);
CHECK(err == kCVReturnSuccess)
<< "CVPixelBufferUnlockBaseAddress failed: " << err;
});
}
#endif // TARGET_IPHONE_SIMULATOR