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obs-filters: Premultiply alpha for precision

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For Apply LUT, and Luma Key, multiply alpha in shader instead of blend
unit for extra precision.
This commit is contained in:
jpark37 2021-05-14 00:29:08 -07:00 committed by Jim
parent df30e3aca6
commit 9e3dfa2409
4 changed files with 35 additions and 6 deletions
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5
plugins/obs-filters/color-grade-filter.c
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@ -452,9 +452,14 @@ static void color_grade_filter_render(void *data, gs_effect_t *effect)
param = gs_effect_get_param_by_name(filter->effect, "cube_width_i"); param = gs_effect_get_param_by_name(filter->effect, "cube_width_i");
gs_effect_set_float(param, 1.0f / filter->cube_width); gs_effect_set_float(param, 1.0f / filter->cube_width);
gs_blend_state_push();
gs_blend_function(GS_BLEND_ONE, GS_BLEND_INVSRCALPHA);
obs_source_process_filter_tech_end(filter->context, filter->effect, 0, obs_source_process_filter_tech_end(filter->context, filter->effect, 0,
0, tech_name); 0, tech_name);
gs_blend_state_pop();
UNUSED_PARAMETER(effect); UNUSED_PARAMETER(effect);
} }

1
plugins/obs-filters/data/color_grade_filter.effect
View File

@ -171,6 +171,7 @@ float4 LUT3D(VertDataOut v_in) : TARGET
} }
textureColor.rgb = srgb_nonlinear_to_linear(textureColor.rgb); textureColor.rgb = srgb_nonlinear_to_linear(textureColor.rgb);
textureColor.rgb *= textureColor.a;
return textureColor; return textureColor;
} }

4
plugins/obs-filters/data/luma_key_filter_v2.effect
View File

@ -38,8 +38,10 @@ float4 PSALumaKeyRGBA(VertData v_in) : TARGET
float chi = 1. - smoothstep(lumaMax - lumaMaxSmooth, lumaMax, luminance); float chi = 1. - smoothstep(lumaMax - lumaMaxSmooth, lumaMax, luminance);
float amask = clo * chi; float amask = clo * chi;
rgba.a *= amask;
rgba.rgb *= rgba.a;
return float4(rgba.rgb, rgba.a * amask); return rgba;
} }
technique Draw technique Draw

31
plugins/obs-filters/luma-key-filter.c
View File

@ -115,10 +115,8 @@ static void *luma_key_create_v2(obs_data_t *settings, obs_source_t *context)
"luma_key_filter_v2.effect"); "luma_key_filter_v2.effect");
} }
static void luma_key_render(void *data, gs_effect_t *effect) static void luma_key_render_internal(void *data, bool premultiplied)
{ {
UNUSED_PARAMETER(effect);
struct luma_key_filter_data *filter = data; struct luma_key_filter_data *filter = data;
if (!obs_source_process_filter_begin(filter->context, GS_RGBA, if (!obs_source_process_filter_begin(filter->context, GS_RGBA,
@ -132,7 +130,30 @@ static void luma_key_render(void *data, gs_effect_t *effect)
gs_effect_set_float(filter->luma_min_smooth_param, gs_effect_set_float(filter->luma_min_smooth_param,
filter->luma_min_smooth); filter->luma_min_smooth);
if (premultiplied) {
gs_blend_state_push();
gs_blend_function(GS_BLEND_ONE, GS_BLEND_INVSRCALPHA);
}
obs_source_process_filter_end(filter->context, filter->effect, 0, 0); obs_source_process_filter_end(filter->context, filter->effect, 0, 0);
if (premultiplied) {
gs_blend_state_pop();
}
}
static void luma_key_render_v1(void *data, gs_effect_t *effect)
{
UNUSED_PARAMETER(effect);
luma_key_render_internal(data, false);
}
static void luma_key_render_v2(void *data, gs_effect_t *effect)
{
UNUSED_PARAMETER(effect);
luma_key_render_internal(data, true);
} }
static obs_properties_t *luma_key_properties(void *data) static obs_properties_t *luma_key_properties(void *data)
@ -167,7 +188,7 @@ struct obs_source_info luma_key_filter = {
.get_name = luma_key_name, .get_name = luma_key_name,
.create = luma_key_create_v1, .create = luma_key_create_v1,
.destroy = luma_key_destroy, .destroy = luma_key_destroy,
.video_render = luma_key_render, .video_render = luma_key_render_v1,
.update = luma_key_update, .update = luma_key_update,
.get_properties = luma_key_properties, .get_properties = luma_key_properties,
.get_defaults = luma_key_defaults, .get_defaults = luma_key_defaults,
@ -181,7 +202,7 @@ struct obs_source_info luma_key_filter_v2 = {
.get_name = luma_key_name, .get_name = luma_key_name,
.create = luma_key_create_v2, .create = luma_key_create_v2,
.destroy = luma_key_destroy, .destroy = luma_key_destroy,
.video_render = luma_key_render, .video_render = luma_key_render_v2,
.update = luma_key_update, .update = luma_key_update,
.get_properties = luma_key_properties, .get_properties = luma_key_properties,
.get_defaults = luma_key_defaults, .get_defaults = luma_key_defaults,