Allow changing MSAA at runtime

port/include/video.h

@@ -45,6 +45,7 @@ s32 videoGetDisplayMode(displaymode *out, const s32 index);
 s32 videoGetNumDisplayModes(void);
 s32 videoGetVsync(void);
 s32 videoGetFramerateLimit(void);
+s32 videoGetMSAA(void);
 
 void videoSetWindowOffset(s32 x, s32 y);
 void videoSetFullscreen(s32 fs);
@@ -55,6 +56,7 @@ void videoSetDetailTextures(s32 detail);
 void videoSetDisplayMode(const s32 index);
 void videoSetVsync(const s32 vsync);
 void videoSetFramerateLimit(const s32 limit);
+void videoSetMSAA(const s32 msaa);
 
 s32 videoCreateFramebuffer(u32 w, u32 h, s32 upscale, s32 autoresize);
 void videoSetFramebuffer(s32 target);

port/src/optionsmenu.c

@@ -790,6 +790,44 @@ static MenuItemHandlerResult menuhandlerFramerateLimit(s32 operation, struct men
 	return 0;
 }
 
+static MenuItemHandlerResult menuhandlerMSAA(s32 operation, struct menuitem *item, union handlerdata *data)
+{
+	s32 msaa;
+	static const char *opts[] = {
+		"Off",
+		"2x",
+		"4x",
+		"8x",
+		"16x"
+	};
+
+	switch (operation) {
+	case MENUOP_GETOPTIONCOUNT:
+		data->dropdown.value = ARRAYCOUNT(opts);
+		break;
+	case MENUOP_GETOPTIONTEXT:
+		return (intptr_t)opts[data->dropdown.value];
+	case MENUOP_SET:
+		videoSetMSAA(1 << data->dropdown.value);
+		break;
+	case MENUOP_GETSELECTEDINDEX:
+		msaa = videoGetMSAA();
+		if (msaa < 2) {
+			data->dropdown.value = 0;
+		} else if (msaa < 4) {
+			data->dropdown.value = 1;
+		} else if (msaa < 8) {
+			data->dropdown.value = 2;
+		} else if (msaa < 16) {
+			data->dropdown.value = 3;
+		} else {
+			data->dropdown.value = 4;
+		}
+	}
+
+	return 0;
+}
+
 static MenuItemHandlerResult menuhandlerResolution(s32 operation, struct menuitem *item, union handlerdata *data)
 {
 	static char resstring[32];
@@ -999,6 +1037,14 @@ struct menuitem g_ExtendedVideoMenuItems[] = {
 		VIDEO_MAX_FPS,
 		menuhandlerFramerateLimit,
 	},
+	{
+		MENUITEMTYPE_DROPDOWN,
+		0,
+		MENUITEMFLAG_LITERAL_TEXT,
+		(uintptr_t)"Anti-aliasing (MSAA)",
+		0,
+		menuhandlerMSAA,
+	},
 	{
 		MENUITEMTYPE_CHECKBOX,
 		0,

port/src/video.c

@@ -217,6 +217,12 @@ s32 videoGetDisplayModeIndex(void)
 	return 0;
 }
 
+s32 videoGetMSAA(void)
+{
+	vidMSAA = (s32)gfx_msaa_level;
+	return vidMSAA;
+}
+
 s32 videoGetVsync(void)
 {
 	vidVsync = wmAPI->get_swap_interval();
@@ -414,6 +420,12 @@ s32 videoCreateFramebuffer(u32 w, u32 h, s32 upscale, s32 autoresize)
 	return gfx_create_framebuffer(w, h, upscale, autoresize);
 }
 
+void videoSetMSAA(const s32 msaa)
+{
+	vidMSAA = msaa;
+	gfx_msaa_level = (u32)vidMSAA;
+}
+
 void videoSetVsync(const s32 vsync)
 {
 	vidVsync = wmAPI->set_swap_interval(vsync) ? vsync : 0;