- OSX bugfix: drawing selection code for vpaint and faceselect happens in AUX

buffers now. It only works nice at OSX (tested, linux and windows do not
  support it nicely)
  This fixes the annoying flashing during paint or select

source/blender/src/drawview.c

@@ -703,7 +703,9 @@ void backdrawview3d(int test)
 			return;
 		}
 	}
-
+#ifdef __APPLE__
+	glDrawBuffer(GL_AUX0);
+#endif	
 	if(G.vd->drawtype > OB_WIRE) G.zbuf= TRUE;
 	curarea->win_swap &= ~WIN_BACK_OK;
 	
@@ -758,6 +760,10 @@ void backdrawview3d(int test)
 	G.zbuf= FALSE; 
 	glDisable(GL_DEPTH_TEST);
 	glEnable(GL_DITHER);
+
+#ifdef __APPLE__
+	glDrawBuffer(GL_BACK); /* we were in aux buffers */
+#endif
 }
 
 		

source/blender/src/editface.c

@@ -445,8 +445,13 @@ TFace* face_pick(Mesh *me, short x, short y)
 		backdrawview3d(0);
 	}
 	/* Read the pixel under the cursor */
+#ifdef __APPLE__
+	glReadBuffer(GL_AUX0);
+#endif
 	glReadPixels(x+curarea->winrct.xmin, y+curarea->winrct.ymin, 1, 1,
 		GL_RGBA, GL_UNSIGNED_BYTE, &col);
+	glReadBuffer(GL_BACK);
+
 	/* Unbelievable! */
 	if (G.order==B_ENDIAN) {
 		SWITCH_INT(col);
@@ -532,8 +537,11 @@ void face_borderselect()
 	
 	val= get_border(&rect, 3);
 	
-	/* why readbuffer here? shouldn't be necessary */
+	/* why readbuffer here? shouldn't be necessary (maybe a flush or so) */
 	glReadBuffer(GL_BACK);
+#ifdef __APPLE__
+	glReadBuffer(GL_AUX0); /* apple only */
+#endif
 	
 	if(val) {
 		selar= MEM_callocN(me->totface+1, "selar");
@@ -571,6 +579,9 @@ void face_borderselect()
 		allqueue(REDRAWVIEW3D, 0);
 		allqueue(REDRAWIMAGE, 0);
 	}
+#ifdef __APPLE__	
+	glReadBuffer(GL_BACK);
+#endif
 }
 
 #define TEST_STRUBI 1				

source/blender/src/editscreen.c

@@ -903,6 +903,7 @@ void screenmain(void)
 {
 	int has_input= 1;
 	int firsttime = 1;
+	
 	while (1) {
 		unsigned short event;
 		short val, towin;

source/blender/src/ghostwinlay.c

@@ -486,8 +486,13 @@ static int event_proc(GHOST_EventHandle evt, GHOST_TUserDataPtr private) {
 				/* 
 				 * XXX quick hack so OSX version works better
 				 * when the window is clicked on (focused).
+				 *
+				 * it used to pass on the old win->lmouse value,
+				 * which causes a wrong click in Blender.
+				 * Actually, a 'focus' click should not be passed
+				 * on to blender... (ton)
 				 */
-				if(1) {
+				if(1) { /* enables me to add locals */
 					int cx, cy, wx, wy;
 					GHOST_GetCursorPosition(g_system, &wx, &wy);
 

source/blender/src/swapbuffers.c

@@ -112,10 +112,11 @@ static void screen_swapbuffers_REDRAW(bScreen *sc)
 	
 	sa= sc->areabase.first;
 	while(sa) {
-	
 		swap= sa->win_swap;
 		if( (swap & WIN_BACK_OK) == 0) {
+			
 			scrarea_do_windraw(sa);
+
 			doswap= 1;
 			sa->win_swap= swap | WIN_BACK_OK;
 		}

source/blender/src/vpaint.c

@@ -596,8 +596,12 @@ static int sample_backbuf_area(int x, int y)
 	y2= y+Gvp.size;
 	CLAMP(y1, 0, curarea->winy);
 	CLAMP(y2, 0, curarea->winy);
-	
+#ifdef __APPLE__
+	glReadBuffer(GL_AUX0);
+#endif
 	glReadPixels(x1+curarea->winrct.xmin, y1+curarea->winrct.ymin, x2-x1+1, y2-y1+1, GL_RGBA, GL_UNSIGNED_BYTE,  rect);
+	glReadBuffer(GL_BACK);	
+
 	if(G.order==B_ENDIAN) IMB_convert_rgba_to_abgr( (int)(4*Gvp.size*Gvp.size), rect);
 
 	rt= rect;
@@ -633,7 +637,12 @@ static unsigned int sample_backbuf(int x, int y)
 	x+= curarea->winrct.xmin;
 	y+= curarea->winrct.ymin;
 
+#ifdef __APPLE__
+	glReadBuffer(GL_AUX0);
+#endif
 	glReadPixels(x,  y, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE,  &col);
+	glReadBuffer(GL_BACK);	
+
 	if(G.order==B_ENDIAN) SWITCH_INT(col);
 		
 	return framebuffer_to_index(col);
@@ -1074,8 +1083,8 @@ void vertex_paint()
 	
 			scrarea_do_windraw(curarea);
 			screen_swapbuffers();
-			backdrawview3d(0);
 			draw_sel_circle(mval, 0, Gvp.size, Gvp.size, 0);
+			backdrawview3d(0);
 	
 			mvalo[0]= mval[0];
 			mvalo[1]= mval[1];