+ // If HDMI/SDI output is active and the user has requested auto mode,
+ // its mode overrides the existing Y'CbCr setting for the chain.
+ YCbCrLumaCoefficients ycbcr_output_coefficients;
+ if (global_flags.ycbcr_auto_coefficients && output_card_index != -1) {
+ ycbcr_output_coefficients = cards[output_card_index].output->preferred_ycbcr_coefficients();
+ } else {
+ ycbcr_output_coefficients = global_flags.ycbcr_rec709_coefficients ? YCBCR_REC_709 : YCBCR_REC_601;
+ }
+
+ // TODO: Reduce the duplication against theme.cpp.
+ YCbCrFormat output_ycbcr_format;
+ output_ycbcr_format.chroma_subsampling_x = 1;
+ output_ycbcr_format.chroma_subsampling_y = 1;
+ output_ycbcr_format.luma_coefficients = ycbcr_output_coefficients;
+ output_ycbcr_format.full_range = false;
+ output_ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
+ chain->change_ycbcr_output_format(output_ycbcr_format);
+
+ // Render main chain. If we're using zerocopy Quick Sync encoding
+ // (the default case), we take an extra copy of the created outputs,
+ // so that we can display it back to the screen later (it's less memory
+ // bandwidth than writing and reading back an RGBA texture, even at 16-bit).
+ // Ideally, we'd like to avoid taking copies and just use the main textures
+ // for display as well, but they're just views into VA-API memory and must be
+ // unmapped during encoding, so we can't use them for display, unfortunately.
+ GLuint y_tex, cbcr_full_tex, cbcr_tex;
+ GLuint y_copy_tex, cbcr_copy_tex = 0;
+ GLuint y_display_tex, cbcr_display_tex;
+ GLenum y_type = (global_flags.x264_bit_depth > 8) ? GL_R16 : GL_R8;
+ GLenum cbcr_type = (global_flags.x264_bit_depth > 8) ? GL_RG16 : GL_RG8;
+ const bool is_zerocopy = video_encoder->is_zerocopy();
+ if (is_zerocopy) {
+ cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
+ y_copy_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
+ cbcr_copy_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
+
+ y_display_tex = y_copy_tex;
+ cbcr_display_tex = cbcr_copy_tex;
+
+ // y_tex and cbcr_tex will be given by VideoEncoder.
+ } else {
+ cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
+ y_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
+ cbcr_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
+
+ y_display_tex = y_tex;
+ cbcr_display_tex = cbcr_tex;
+ }
+