libobs: Update async textures via function parameters

Instead of just updating the async texture variables directly in the
source, allow the ability to pass the async texture variables via
function parameters to allow the ability to parse more than one frame to
more than one texture.

This code is primarily intended to be used to upload/convert the
"previous" async frame for the deinterlacer (if necessary).

libobs/obs-internal.h

@@ -710,6 +710,9 @@ extern void add_alignment(struct vec2 *v, uint32_t align, int cx, int cy);
 
 extern struct obs_source_frame *filter_async_video(obs_source_t *source,
 		struct obs_source_frame *in);
+extern bool update_async_texture(struct obs_source *source,
+		const struct obs_source_frame *frame,
+		gs_texture_t *tex, gs_texrender_t *texrender);
 extern bool set_async_texture_size(struct obs_source *source,
 		const struct obs_source_frame *frame);
 extern void remove_async_frame(obs_source_t *source,

libobs/obs-source.c

@@ -1382,11 +1382,9 @@ static inline void set_eparam(gs_effect_t *effect, const char *name, float val)
 }
 
 static bool update_async_texrender(struct obs_source *source,
-		const struct obs_source_frame *frame)
+		const struct obs_source_frame *frame,
+		gs_texture_t *tex, gs_texrender_t *texrender)
 {
-	gs_texture_t   *tex       = source->async_texture;
-	gs_texrender_t *texrender = source->async_convert_texrender;
-
 	gs_texrender_reset(texrender);
 
 	upload_raw_frame(tex, frame);
@@ -1439,11 +1437,10 @@ static bool update_async_texrender(struct obs_source *source,
 	return true;
 }
 
-static bool update_async_texture(struct obs_source *source,
-		const struct obs_source_frame *frame)
+bool update_async_texture(struct obs_source *source,
+		const struct obs_source_frame *frame,
+		gs_texture_t *tex, gs_texrender_t *texrender)
 {
-	gs_texture_t      *tex       = source->async_texture;
-	gs_texrender_t    *texrender = source->async_convert_texrender;
 	enum convert_type type      = get_convert_type(frame->format);
 	uint8_t           *ptr;
 	uint32_t          linesize;
@@ -1458,7 +1455,7 @@ static bool update_async_texture(struct obs_source *source,
 			sizeof frame->color_range_max);
 
 	if (source->async_gpu_conversion && texrender)
-		return update_async_texrender(source, frame);
+		return update_async_texrender(source, frame, tex, texrender);
 
 	if (type == CONVERT_NONE) {
 		gs_texture_set_image(tex, frame->data[0], frame->linesize[0],
@@ -1565,13 +1562,14 @@ static void obs_source_update_async_video(obs_source_t *source)
 				os_gettime_ns() - frame->timestamp;
 			source->timing_set = true;
 
-			if (!set_async_texture_size(source, frame))
-				return;
-			if (!update_async_texture(source, frame))
-				return;
-		}
+			if (set_async_texture_size(source, frame)) {
+				update_async_texture(source, frame,
+						source->async_texture,
+						source->async_convert_texrender);
+			}
 
-		obs_source_release_frame(source, frame);
+			obs_source_release_frame(source, frame);
+		}
 	}
 }