M include/mgba/internal/ds/video.h → include/mgba/internal/ds/video.h

@@ -112,6 +112,12 @@ uint16_t* vramBBG[32];
 	uint16_t* vramBOBJ[32];
 	uint16_t* vramBBGExtPal[4];
 	uint16_t* vramBOBJExtPal;
+
+	bool disableABG[4];
+	bool disableAOBJ;
+	bool disableBBG[4];
+	bool disableBOBJ;
+
 	union DSOAM* oam;
 	struct DSGX* gx;
 };

M src/ds/core.c → src/ds/core.c

@@ -24,11 +24,11 @@ { 1, "abg1", "A BG1", NULL },
 	{ 2, "abg2", "A BG2", NULL },
 	{ 3, "abg3", "A BG3", NULL },
 	{ 4, "aobj", "A OBJ", NULL },
-	{ 5, "bbg0", "B BG0", "2D/3D" },
-	{ 6, "bbg1", "B BG1", NULL },
-	{ 7, "bbg2", "B BG2", NULL },
-	{ 8, "bbg3", "B BG3", NULL },
-	{ 9, "bobj", "B OBJ", NULL },
+	{ 10, "bbg0", "B BG0", "2D/3D" },
+	{ 11, "bbg1", "B BG1", NULL },
+	{ 12, "bbg2", "B BG2", NULL },
+	{ 13, "bbg3", "B BG3", NULL },
+	{ 14, "bobj", "B OBJ", NULL },
 };
 
 const static struct mCoreChannelInfo _DSAudioChannels[] = {
@@ -564,7 +564,28 @@ }
 
 static void _DSCoreEnableVideoLayer(struct mCore* core, size_t id, bool enable) {
 	struct DS* ds = core->board;
-	// TODO
+	switch (id) {
+	case 0:
+	case 1:
+	case 2:
+	case 3:
+		ds->video.renderer->disableABG[id] = !enable;
+		break;
+	case 4:
+		ds->video.renderer->disableAOBJ = !enable;
+		break;
+	case 10:
+	case 11:
+	case 12:
+	case 13:
+		ds->video.renderer->disableBBG[id - 10] = !enable;
+		break;
+	case 14:
+		ds->video.renderer->disableBOBJ = !enable;
+		break;
+	default:
+		break;
+	}
 }
 
 static void _DSCoreEnableAudioChannel(struct mCore* core, size_t id, bool enable) {

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

@@ -146,6 +146,18 @@ renderer->d.finishFrame = DSVideoSoftwareRendererFinishFrame;
 	renderer->d.getPixels = DSVideoSoftwareRendererGetPixels;
 	renderer->d.putPixels = DSVideoSoftwareRendererPutPixels;
 
+	renderer->d.disableABG[0] = false;
+	renderer->d.disableABG[1] = false;
+	renderer->d.disableABG[2] = false;
+	renderer->d.disableABG[3] = false;
+	renderer->d.disableAOBJ = false;
+
+	renderer->d.disableBBG[0] = false;
+	renderer->d.disableBBG[1] = false;
+	renderer->d.disableBBG[2] = false;
+	renderer->d.disableBBG[3] = false;
+	renderer->d.disableBOBJ = false;
+
 	renderer->engA.d.cache = NULL;
 	GBAVideoSoftwareRendererCreate(&renderer->engA);
 	renderer->engA.combinedObjSort = true;
@@ -610,6 +622,18 @@ } else {
 		softwareRenderer->engA.outputBuffer = softwareRenderer->outputBuffer;
 		softwareRenderer->engB.outputBuffer = &softwareRenderer->outputBuffer[softwareRenderer->outputBufferStride * DS_VIDEO_VERTICAL_PIXELS];
 	}
+
+	softwareRenderer->engA.d.disableBG[0] = softwareRenderer->d.disableABG[0];
+	softwareRenderer->engA.d.disableBG[1] = softwareRenderer->d.disableABG[1];
+	softwareRenderer->engA.d.disableBG[2] = softwareRenderer->d.disableABG[2];
+	softwareRenderer->engA.d.disableBG[3] = softwareRenderer->d.disableABG[3];
+	softwareRenderer->engA.d.disableOBJ = softwareRenderer->d.disableAOBJ;
+
+	softwareRenderer->engB.d.disableBG[0] = softwareRenderer->d.disableBBG[0];
+	softwareRenderer->engB.d.disableBG[1] = softwareRenderer->d.disableBBG[1];
+	softwareRenderer->engB.d.disableBG[2] = softwareRenderer->d.disableBBG[2];
+	softwareRenderer->engB.d.disableBG[3] = softwareRenderer->d.disableBBG[3];
+	softwareRenderer->engB.d.disableOBJ = softwareRenderer->d.disableBOBJ;
 
 	_drawScanlineA(softwareRenderer, y);
 	_drawScanlineB(softwareRenderer, y);

M src/platform/qt/GameController.cpp → src/platform/qt/GameController.cpp

@@ -902,7 +902,7 @@ }
 }
 
 void GameController::setVideoLayerEnabled(int layer, bool enable) {
-	if (layer > 4 || layer < 0) {
+	if (layer > 32 || layer < 0) {
 		return;
 	}
 	m_videoLayers.reserve(layer + 1);