M include/mgba/gb/interface.h → include/mgba/gb/interface.h

@@ -42,6 +42,12 @@ GB_UNL_BBD = 0x220, // Also used as a mask for MBCs that need special read behavior
 	GB_UNL_HITEK = 0x221,
 };
 
+enum GBVideoLayer {
+	GB_LAYER_BACKGROUND = 0,
+	GB_LAYER_WINDOW,
+	GB_LAYER_OBJ
+};
+
 struct GBSIODriver {
 	struct GBSIO* p;
 

M src/gb/core.c → src/gb/core.c

@@ -26,9 +26,9 @@ #include <mgba-util/patch.h>
 #include <mgba-util/vfs.h>
 
 static const struct mCoreChannelInfo _GBVideoLayers[] = {
-	{ 0, "bg", "Background", NULL },
-	{ 1, "bgwin", "Window", NULL },
-	{ 2, "obj", "Objects", NULL },
+	{ GB_LAYER_BACKGROUND, "bg", "Background", NULL },
+	{ GB_LAYER_WINDOW, "bgwin", "Window", NULL },
+	{ GB_LAYER_OBJ, "obj", "Objects", NULL },
 };
 
 static const struct mCoreChannelInfo _GBAudioChannels[] = {
@@ -916,13 +916,13 @@
 static void _GBCoreEnableVideoLayer(struct mCore* core, size_t id, bool enable) {
 	struct GB* gb = core->board;
 	switch (id) {
-	case 0:
+	case GB_LAYER_BACKGROUND:
 		gb->video.renderer->disableBG = !enable;
 		break;
-	case 1:
+	case GB_LAYER_WINDOW:
 		gb->video.renderer->disableWIN = !enable;
 		break;
-	case 2:
+	case GB_LAYER_OBJ:
 		gb->video.renderer->disableOBJ = !enable;
 		break;
 	default:
@@ -947,15 +947,15 @@
 static void _GBCoreAdjustVideoLayer(struct mCore* core, size_t id, int32_t x, int32_t y) {
 	struct GBCore* gbcore = (struct GBCore*) core;
 	switch (id) {
-	case 0:
+	case GB_LAYER_BACKGROUND:
 		gbcore->renderer.offsetScx = x;
 		gbcore->renderer.offsetScy = y;
 		break;
-	case 1:
+	case GB_LAYER_WINDOW:
 		gbcore->renderer.offsetWx = x;
 		gbcore->renderer.offsetWy = y;
 		break;
-	case 2:
+	case GB_LAYER_OBJ:
 		gbcore->renderer.objOffsetX = x;
 		gbcore->renderer.objOffsetY = y;
 		break;