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(API Change) libobs: Add bicubic/lanczos scaling

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This adds bicubic and lanczos scaling capability to libobs to improve
scaling quality and sharpness when the output resolution has to be
scaled relative to the base resolution.  Bilinear is also available,
although bilinear has rather poor quality and causes scaling to appear
blurry.

If the output resolution is close to the base resolution, then bilinear
is used instead as an optimization, as there's no need to use these
shaders if scaling is not in use.

The Bicubic and Lanczos effects are also exposed via exported function
to allow the ability to use those shaders in plugin modules if desired.

The API change adds a variable 'scale_type' to the obs_video_info
structure that allows the user interface to choose what type of scaling
filter should be used.
This commit is contained in:
jp9000
2014-12-14 23:45:44 -08:00
parent 1b454647bd
commit c88220552f
6 changed files with 358 additions and 2 deletions
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14
libobs/obs.c
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@@ -244,6 +244,16 @@ static int obs_init_graphics(struct obs_video_info *ovi)
NULL);
bfree(filename);
filename = find_libobs_data_file("bicubic_scale.effect");
video->bicubic_effect = gs_effect_create_from_file(filename,
NULL);
bfree(filename);
filename = find_libobs_data_file("lanczos_scale.effect");
video->lanczos_effect = gs_effect_create_from_file(filename,
NULL);
bfree(filename);
if (!video->default_effect)
success = false;
if (gs_get_device_type() == GS_DEVICE_OPENGL) {
@@ -293,6 +303,7 @@ static int obs_init_video(struct obs_video_info *ovi)
video->output_width = ovi->output_width;
video->output_height = ovi->output_height;
video->gpu_conversion = ovi->gpu_conversion;
video->scale_type = ovi->scale_type;
set_video_matrix(video, ovi);
@@ -399,6 +410,8 @@ static void obs_free_graphics(void)
gs_effect_destroy(video->default_rect_effect);
gs_effect_destroy(video->solid_effect);
gs_effect_destroy(video->conversion_effect);
gs_effect_destroy(video->bicubic_effect);
gs_effect_destroy(video->lanczos_effect);
video->default_effect = NULL;
gs_leave_context();
@@ -756,6 +769,7 @@ bool obs_get_video_info(struct obs_video_info *ovi)
ovi->base_width = video->base_width;
ovi->base_height = video->base_height;
ovi->gpu_conversion= video->gpu_conversion;
ovi->scale_type = video->scale_type;
ovi->colorspace = info->colorspace;
ovi->range = info->range;
ovi->output_width = info->width;