OBS/obs-studio
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image-source: Use DrawNonlinearAlpha

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Match previous OBS alpha behavior.

DrawNonlinearAlpha requires premultiplied alpha blend state.
This commit is contained in:
jpark37 2021-04-23 23:03:27 -07:00
parent aed52412d4
commit b911e9b0cc
1 changed files with 21 additions and 9 deletions
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30
plugins/image-source/image-source.c
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@ -147,19 +147,31 @@ static void image_source_render(void *data, gs_effect_t *effect)
if (!context->if2.image.texture)
return;
const bool linear_srgb = gs_get_linear_srgb();
effect = obs_get_base_effect(OBS_EFFECT_DEFAULT);
gs_technique_t *tech =
gs_effect_get_technique(effect, "DrawNonlinearAlpha");
const bool previous = gs_framebuffer_srgb_enabled();
gs_enable_framebuffer_srgb(linear_srgb);
gs_enable_framebuffer_srgb(true);
gs_blend_state_push();
gs_blend_function(GS_BLEND_ONE, GS_BLEND_INVSRCALPHA);
gs_eparam_t *const param = gs_effect_get_param_by_name(effect, "image");
if (linear_srgb)
gs_effect_set_texture_srgb(param, context->if2.image.texture);
else
gs_effect_set_texture(param, context->if2.image.texture);
gs_effect_set_texture_srgb(param, context->if2.image.texture);
gs_draw_sprite(context->if2.image.texture, 0, context->if2.image.cx,
context->if2.image.cy);
size_t passes = gs_technique_begin(tech);
for (size_t i = 0; i < passes; i++) {
gs_technique_begin_pass(tech, i);
gs_draw_sprite(context->if2.image.texture, 0,
context->if2.image.cx, context->if2.image.cy);
gs_technique_end_pass(tech);
}
gs_technique_end(tech);
gs_blend_state_pop();
gs_enable_framebuffer_srgb(previous);
}
@ -298,7 +310,7 @@ static obs_missing_files_t *image_source_missingfiles(void *data)
static struct obs_source_info image_source_info = {
.id = "image_source",
.type = OBS_SOURCE_TYPE_INPUT,
.output_flags = OBS_SOURCE_VIDEO,
.output_flags = OBS_SOURCE_VIDEO | OBS_SOURCE_CUSTOM_DRAW,
.get_name = image_source_get_name,
.create = image_source_create,
.destroy = image_source_destroy,