obs-studio/plugins/obs-transitions/transition-fade.c

102 lines
2.3 KiB
C

#include <obs-module.h>
struct fade_info {
obs_source_t *source;
gs_effect_t *effect;
gs_eparam_t *a_param;
gs_eparam_t *b_param;
gs_eparam_t *fade_param;
};
static const char *fade_get_name(void *type_data)
{
UNUSED_PARAMETER(type_data);
return obs_module_text("FadeTransition");
}
static void *fade_create(obs_data_t *settings, obs_source_t *source)
{
struct fade_info *fade;
char *file = obs_module_file("fade_transition.effect");
gs_effect_t *effect;
obs_enter_graphics();
effect = gs_effect_create_from_file(file, NULL);
obs_leave_graphics();
bfree(file);
if (!effect) {
blog(LOG_ERROR, "Could not find fade_transition.effect");
return NULL;
}
fade = bmalloc(sizeof(*fade));
fade->source = source;
fade->effect = effect;
fade->a_param = gs_effect_get_param_by_name(effect, "tex_a");
fade->b_param = gs_effect_get_param_by_name(effect, "tex_b");
fade->fade_param = gs_effect_get_param_by_name(effect, "fade_val");
UNUSED_PARAMETER(settings);
return fade;
}
static void fade_destroy(void *data)
{
struct fade_info *fade = data;
bfree(fade);
}
static void fade_callback(void *data, gs_texture_t *a, gs_texture_t *b, float t,
uint32_t cx, uint32_t cy)
{
struct fade_info *fade = data;
gs_effect_set_texture(fade->a_param, a);
gs_effect_set_texture(fade->b_param, b);
gs_effect_set_float(fade->fade_param, t);
while (gs_effect_loop(fade->effect, "Fade"))
gs_draw_sprite(NULL, 0, cx, cy);
}
static void fade_video_render(void *data, gs_effect_t *effect)
{
struct fade_info *fade = data;
obs_transition_video_render(fade->source, fade_callback);
UNUSED_PARAMETER(effect);
}
static float mix_a(void *data, float t)
{
UNUSED_PARAMETER(data);
return 1.0f - t;
}
static float mix_b(void *data, float t)
{
UNUSED_PARAMETER(data);
return t;
}
static bool fade_audio_render(void *data, uint64_t *ts_out,
struct obs_source_audio_mix *audio,
uint32_t mixers, size_t channels,
size_t sample_rate)
{
struct fade_info *fade = data;
return obs_transition_audio_render(fade->source, ts_out, audio, mixers,
channels, sample_rate, mix_a, mix_b);
}
struct obs_source_info fade_transition = {
.id = "fade_transition",
.type = OBS_SOURCE_TYPE_TRANSITION,
.get_name = fade_get_name,
.create = fade_create,
.destroy = fade_destroy,
.video_render = fade_video_render,
.audio_render = fade_audio_render,
};