M include/mgba/internal/gba/renderers/video-software.h → include/mgba/internal/gba/renderers/video-software.h

@@ -164,6 +164,7 @@ int oamDirty;
 	int oamMax;
 	struct GBAVideoSoftwareSprite sprites[128];
 	int tileStride;
+	int bitmapStride;
 	bool combinedObjSort;
 
 	int start;

M src/ds/renderers/software.c → src/ds/renderers/software.c

@@ -217,6 +217,7 @@ } else {
 		eng->tileStride = 0x20 << DSRegisterDISPCNTGetTileBoundary(dispcnt);
 		fakeDispcnt = GBARegisterDISPCNTFillObjCharacterMapping(fakeDispcnt);
 	}
+	eng->bitmapStride = 0x10 << DSRegisterDISPCNTGetBitmapObj2D(dispcnt);
 	eng->d.writeVideoRegister(&eng->d, DS9_REG_A_DISPCNT_LO, fakeDispcnt);
 	eng->dispcnt |= dispcnt & 0xFFFF0000;
 	if (DSRegisterDISPCNTIsBgExtPalette(dispcnt)) {

M src/gba/renderers/software-obj.c → src/gba/renderers/software-obj.c

@@ -233,8 +233,8 @@ }
 	int32_t x = (uint32_t) GBAObjAttributesBGetX(sprite->b) << 23;
 	x >>= 23;
 	unsigned charBase = GBAObjAttributesCGetTile(sprite->c);
-	if (GBAObjAttributesAGetMode(sprite->a) == OBJ_MODE_BITMAP) {
-		charBase = (charBase & 0x1F) * 0x10 + (charBase & ~0x1F) * 0x80;
+	if (GBAObjAttributesAGetMode(sprite->a) == OBJ_MODE_BITMAP && renderer->bitmapStride) {
+		charBase = (charBase & (renderer->bitmapStride - 1)) * 0x10 + (charBase & ~(renderer->bitmapStride - 1)) * 0x80;
 	} else {
 		charBase *= renderer->tileStride;
 	}
@@ -281,8 +281,8 @@ }
 
 	int inY = y - (int) GBAObjAttributesAGetY(sprite->a);
 	int stride = GBARegisterDISPCNTIsObjCharacterMapping(renderer->dispcnt) ? (width >> !GBAObjAttributesAIs256Color(sprite->a)) : 0x80;
-	if (GBAObjAttributesAGetMode(sprite->a) == OBJ_MODE_BITMAP) {
-		stride = 0x100; // TODO: Param
+	if (GBAObjAttributesAGetMode(sprite->a) == OBJ_MODE_BITMAP && renderer->bitmapStride) {
+		stride = renderer->bitmapStride << 3;
 	}
 
 	uint32_t current;
@@ -350,7 +350,7 @@ if (outX < start || outX >= condition) {
 			return 0;
 		}
 
-		if (GBAObjAttributesAGetMode(sprite->a) == OBJ_MODE_BITMAP) {
+		if (GBAObjAttributesAGetMode(sprite->a) == OBJ_MODE_BITMAP && renderer->bitmapStride) {
 			int alpha = GBAObjAttributesCGetPalette(sprite->c);
 			if (flags & FLAG_OBJWIN) {
 				SPRITE_TRANSFORMED_LOOP(BITMAP, OBJWIN);
@@ -416,7 +416,7 @@ if (GBAObjAttributesBIsHFlip(sprite->b)) {
 			inX = width - inX - 1;
 			xOffset = -1;
 		}
-		if (GBAObjAttributesAGetMode(sprite->a) == OBJ_MODE_BITMAP) {
+		if (GBAObjAttributesAGetMode(sprite->a) == OBJ_MODE_BITMAP && renderer->bitmapStride) {
 			int alpha = GBAObjAttributesCGetPalette(sprite->c);
 			if (flags & FLAG_OBJWIN) {
 				SPRITE_NORMAL_LOOP(BITMAP, OBJWIN);

M src/gba/renderers/video-software.c → src/gba/renderers/video-software.c

@@ -62,6 +62,7 @@ renderer->d.disableBG[2] = false;
 	renderer->d.disableBG[3] = false;
 	renderer->d.disableOBJ = false;
 	renderer->tileStride = 0x20;
+	renderer->bitmapStride = 0;
 	renderer->combinedObjSort = false;
 	renderer->masterEnd = VIDEO_HORIZONTAL_PIXELS;
 	renderer->masterHeight = VIDEO_VERTICAL_PIXELS;