option to immediately write single render to a file added for OpenGL render.

source/blender/editors/render/render_internal.c

@@ -718,7 +718,7 @@ static int screen_render_invoke(bContext *C, wmOperator *op, wmEvent *event)
 	rj->srl = srl;
 	rj->lay = (v3d)? v3d->lay: scene->lay;
 	rj->anim= is_animation;
-	rj->write_still= is_write_still;
+	rj->write_still= is_write_still && !is_animation;
 	rj->iuser.scene= scene;
 	rj->iuser.ok= 1;
 	rj->reports= op->reports;

source/blender/editors/render/render_opengl.c

@@ -81,6 +81,7 @@ typedef struct OGLRender {
 
 	GPUOffScreen *ofs;
 	int sizex, sizey;
+	int write_still;
 
 	ReportList *reports;
 	bMovieHandle *mh;
@@ -112,7 +113,7 @@ static void screen_opengl_render_apply(OGLRender *oglrender)
 	float winmat[4][4];
 	int sizex= oglrender->sizex;
 	int sizey= oglrender->sizey;
-	int view_context = (v3d != NULL);
+	const short view_context= (v3d != NULL);
 
 	rr= RE_AcquireResultRead(oglrender->re);
 	
@@ -196,7 +197,20 @@ static void screen_opengl_render_apply(OGLRender *oglrender)
 
 	/* update byte from float buffer */
 	ibuf= BKE_image_acquire_ibuf(oglrender->ima, &oglrender->iuser, &lock);
-	if(ibuf) image_buffer_rect_update(NULL, rr, ibuf, NULL);
+
+	if(ibuf) {
+		image_buffer_rect_update(NULL, rr, ibuf, NULL);
+
+		if(oglrender->write_still) {
+			char name[FILE_MAX];
+			int ok;
+			BKE_makepicstring(name, scene->r.pic, scene->r.cfra, scene->r.imtype, scene->r.scemode & R_EXTENSION, FALSE);
+			ok= BKE_write_ibuf(scene, ibuf, name, scene->r.imtype, scene->r.subimtype, scene->r.quality);
+			if(ok)	printf("OpenGL Render written to '%s'\n", name);
+			else	printf("OpenGL Render failed to write '%s'\n", name);
+		}
+	}
+	
 	BKE_image_release_ibuf(oglrender->ima, lock);
 }
 
@@ -208,24 +222,31 @@ static int screen_opengl_render_init(bContext *C, wmOperator *op)
 	GPUOffScreen *ofs;
 	OGLRender *oglrender;
 	int sizex, sizey;
-	int view_context= RNA_boolean_get(op->ptr, "view_context");
+	short is_view_context= RNA_boolean_get(op->ptr, "view_context");
+	const short is_animation= RNA_boolean_get(op->ptr, "animation");
+	const short is_write_still= RNA_boolean_get(op->ptr, "view_context");
 
 	/* ensure we have a 3d view */
 
 	if(!ED_view3d_context_activate(C)) {
 		RNA_boolean_set(op->ptr, "view_context", 0);
-		view_context = 0;
+		is_view_context= 0;
 	}
 
 	/* only one render job at a time */
 	if(WM_jobs_test(CTX_wm_manager(C), scene))
 		return 0;
 	
-	if(!view_context && scene->camera==NULL) {
+	if(!is_view_context && scene->camera==NULL) {
 		BKE_report(op->reports, RPT_ERROR, "Scene has no camera.");
 		return 0;
 	}
 
+	if(!is_animation && is_write_still && BKE_imtype_is_movie(scene->r.imtype)) {
+		BKE_report(op->reports, RPT_ERROR, "Can't write a single file with an animation format selected.");
+		return 0;
+	}
+
 	/* stop all running jobs, currently previews frustrate Render */
 	WM_jobs_stop_all(CTX_wm_manager(C));
 
@@ -252,7 +273,9 @@ static int screen_opengl_render_init(bContext *C, wmOperator *op)
 	oglrender->sizey= sizey;
 	oglrender->scene= scene;
 
-	if(view_context) {
+	oglrender->write_still= is_write_still && !is_animation;
+
+	if(is_view_context) {
 		oglrender->v3d= CTX_wm_view3d(C);
 		oglrender->ar= CTX_wm_region(C);
 		oglrender->rv3d= CTX_wm_region_view3d(C);
@@ -343,7 +366,7 @@ static int screen_opengl_render_anim_step(bContext *C, wmOperator *op)
 	void *lock;
 	char name[FILE_MAXDIR+FILE_MAXFILE];
 	int ok= 0;
-	int view_context = (oglrender->v3d != NULL);
+	const short  view_context= (oglrender->v3d != NULL);
 
 	/* update animated image textures for gpu, etc,
 	 * call before scene_update_for_newframe so modifiers with textuers dont lag 1 frame */
@@ -488,12 +511,12 @@ static int screen_opengl_render_invoke(bContext *C, wmOperator *op, wmEvent *eve
 /* executes blocking render */
 static int screen_opengl_render_exec(bContext *C, wmOperator *op)
 {
-	int anim= RNA_boolean_get(op->ptr, "animation");
+	const short is_animation= RNA_boolean_get(op->ptr, "animation");
 
 	if(!screen_opengl_render_init(C, op))
 		return OPERATOR_CANCELLED;
 
-	if(!anim) { /* same as invoke */
+	if(!is_animation) { /* same as invoke */
 		/* render image */
 		screen_opengl_render_apply(op->customdata);
 		screen_opengl_render_end(C, op->customdata);
@@ -533,7 +556,8 @@ void RENDER_OT_opengl(wmOperatorType *ot)
 
 	ot->poll= ED_operator_screenactive;
 
-	RNA_def_boolean(ot->srna, "animation", 0, "Animation", "");
+	RNA_def_boolean(ot->srna, "animation", 0, "Animation", "Render files from the animation range of this scene");
+	RNA_def_boolean(ot->srna, "write_still", 0, "Write Image", "Save rendered the image to the output path (used only when animation is disabled)");
 	RNA_def_boolean(ot->srna, "view_context", 1, "View Context", "Use the current 3D view for rendering, else use scene settings.");
 }