mirror/obs-studio
1
0
Fork 0
mirror of https://github.com/obsproject/obs-studio.git synced 2026-05-19 05:51:16 -04:00
Code Issues Packages Projects Releases Wiki Activity

libobs: Filter using premultiplied alpha

Browse Source 
Convert incoming straight alpha color to premultiplied at filter begin,
and process premultiplied value at filter end.

If direct rendering is allowed, we assume the input source outputs
premultiiplied alpha. If not, that source will need to be updated.
This commit is contained in:
jpark37
2021-04-24 17:32:38 -07:00
parent 840e2b3d43
commit 50dfa566e6
1 changed files with 11 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
libobs/obs-source.c
View File

@@ -3701,10 +3701,11 @@ bool obs_source_process_filter_begin(obs_source_t *filter,
filter->filter_texrender =
gs_texrender_create(format, GS_ZS_NONE);
gs_blend_state_push();
gs_blend_function(GS_BLEND_ONE, GS_BLEND_ZERO);
if (gs_texrender_begin(filter->filter_texrender, cx, cy)) {
gs_blend_state_push();
gs_blend_function_separate(GS_BLEND_SRCALPHA, GS_BLEND_ZERO,
GS_BLEND_ONE, GS_BLEND_ZERO);
bool custom_draw = (parent_flags & OBS_SOURCE_CUSTOM_DRAW) != 0;
bool async = (parent_flags & OBS_SOURCE_ASYNC) != 0;
struct vec4 clear_color;
@@ -3718,10 +3719,10 @@ bool obs_source_process_filter_begin(obs_source_t *filter,
else
obs_source_video_render(target);
gs_blend_state_pop();
gs_texrender_end(filter->filter_texrender);
}
gs_blend_state_pop();
return true;
}
@@ -3748,6 +3749,9 @@ static void obs_source_process_filter_tech_end_internal(
const char *tech = tech_name ? tech_name : "Draw";
gs_blend_state_push();
gs_blend_function(GS_BLEND_ONE, GS_BLEND_INVSRCALPHA);
if (can_bypass(target, parent, parent_flags, filter->allow_direct)) {
render_filter_bypass(target, effect, tech);
} else {
@@ -3757,6 +3761,8 @@ static void obs_source_process_filter_tech_end_internal(
}
}
gs_blend_state_pop();
gs_set_linear_srgb(previous);
}