DS GX: Don't reset state between swaps (fixes #642)

CHANGES

@@ -10,14 +10,14 @@ Bugfixes:
  - DS Video: Capture with alpha bit set
  - DS Video: Bitmap sprites use alpha bit for transparent
  - DS GX: Fix 4-color texture coordinates
- - DS GX: Reset polygon attributes between buffer swaps
  - DS Video: Fix blend bit on windows for 3D layer (fixes mgba.io/i/611)
  - DS GX: Hack around writing to a full FIFO that has a swap pending (fixes mgba.io/i/608)
  - DS Video: Enable overflow bit on extended affine modes
  - DS Video: Fix extended mode 0 without extended palettes
  - DS Video: Fix caputre stride
  - DS Video: Fix affine transformations in video capture
  - DS GX: Fix bitmap textures when no palette is mapped (fixes mgba.io/i/628)
+ - DS GX: Don't reset state between buffer swaps (fixes mgba.io/i/642)
 Misc:
  - DS: Set boot complete bit in RAM on boot (fixes mgba.io/i/576, mgba.io/i/580, mgba.io/i/586)
  - DS Memory: Ensure DS9 I/O is 8-byte aligned

src/ds/gx.c

@@ -1172,11 +1172,6 @@ static void _fifoRun(struct mTiming* timing, void* context, uint32_t cyclesLate)
 		case DS_GX_CMD_SWAP_BUFFERS:
 			gx->swapBuffers = true;
 			gx->wSort = entry.params[0] & 2;
-			memset(&gx->currentVertex, 0, sizeof(gx->currentVertex));
-			memset(&gx->nextPoly, 0, sizeof(gx-> nextPoly));
-			gx->currentVertex.color = 0x7FFF;
-			gx->currentPoly.polyParams = 0x001F00C0;
-			gx->nextPoly.polyParams = 0x001F00C0;
 			break;
 		case DS_GX_CMD_VIEWPORT:
 			gx->viewportX1 = (uint8_t) entry.params[0];