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

@@ -157,6 +157,7 @@ struct CircleBuffer fifo;
 	struct CircleBuffer pipe;
 
 	struct mTimingEvent fifoEvent;
+	int dmaSource;
 
 	int outstandingParams[4];
 	uint8_t outstandingCommand[4];
@@ -213,6 +214,10 @@ uint32_t DSGXWriteRegister32(struct DSGX*, uint32_t address, uint32_t value);
 
 void DSGXFlush(struct DSGX*);
 void DSGXUpdateGXSTAT(struct DSGX*);
+
+struct GBADMA;
+struct DSCommon;
+void DSGXScheduleDMA(struct DSCommon* dscore, int number, struct GBADMA* info);
 
 CXX_GUARD_END
 

M src/ds/dma.c → src/ds/dma.c

@@ -6,6 +6,7 @@ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #include <mgba/internal/ds/dma.h>
 
 #include <mgba/internal/ds/ds.h>
+#include <mgba/internal/ds/gx.h>
 #include <mgba/internal/ds/io.h>
 #include <mgba/internal/ds/memory.h>
 
@@ -97,6 +98,9 @@ // Handled implicitly
 		return;
 	case DS9_DMA_TIMING_SLOT1:
 		DSSlot1ScheduleDMA(dscore, number, info);
+		return;
+	case DS_DMA_TIMING_GEOM_FIFO:
+		DSGXScheduleDMA(dscore, number, info);
 		return;
 	case DS_DMA_TIMING_HBLANK: // DS7_DMA_TIMING_SLOT1
 	default:

M src/ds/gx.c → src/ds/gx.c

@@ -1021,6 +1021,7 @@ gx->activeParams = 0;
 	memset(&gx->currentVertex, 0, sizeof(gx->currentVertex));
 	memset(&gx->nextPoly, 0, sizeof(gx-> nextPoly));
 	gx->currentVertex.color = 0x7FFF;
+	gx->dmaSource = -1;
 }
 
 void DSGXAssociateRenderer(struct DSGX* gx, struct DSGXRenderer* renderer) {
@@ -1052,6 +1053,21 @@
 	value = DSRegGXSTATSetBusy(value, mTimingIsScheduled(&gx->p->ds9.timing, &gx->fifoEvent) || gx->swapBuffers);
 
 	gx->p->memory.io9[DS9_REG_GXSTAT_HI >> 1] = value >> 16;
+
+	struct GBADMA* dma = NULL;
+	if (gx->dmaSource >= 0) {
+		dma = &gx->p->ds9.memory.dma[gx->dmaSource];
+		if (GBADMARegisterGetTiming9(dma->reg) != DS_DMA_TIMING_GEOM_FIFO) {
+			gx->dmaSource = -1;
+		} else if (GBADMARegisterIsEnable(dma->reg) && entries < (DS_GX_FIFO_SIZE / 2) && !dma->nextCount) {
+			dma->nextCount = dma->count;
+			if (dma->count > 112) {
+				dma->nextCount = 112;
+			}
+			dma->when = mTimingCurrentTime(&gx->p->ds9.timing);
+			DSDMAUpdate(&gx->p->ds9);
+		}
+	}
 }
 
 static void DSGXUnpackCommand(struct DSGX* gx, uint32_t command) {
@@ -1244,6 +1260,11 @@ }
 	}
 
 	DSGXUpdateGXSTAT(gx);
+}
+
+void DSGXScheduleDMA(struct DSCommon* dscore, int number, struct GBADMA* info) {
+	UNUSED(info);
+	dscore->p->gx.dmaSource = number;
 }
 
 static void DSGXDummyRendererInit(struct DSGXRenderer* renderer) {