+ if (swr_fs->info.base.uses_kill ||
+ key.poly_stipple_enable) {
+ Value *vActiveMask = NULL;
+ if (swr_fs->info.base.uses_kill) {
+ vActiveMask = LOAD(pPS, {0, SWR_PS_CONTEXT_activeMask}, "activeMask");
+ }
+ if (key.poly_stipple_enable) {
+ // first get fragment xy coords and clip to stipple bounds
+ Value *vXf = LOAD(pPS, {0, SWR_PS_CONTEXT_vX, PixelPositions_UL});
+ Value *vYf = LOAD(pPS, {0, SWR_PS_CONTEXT_vY, PixelPositions_UL});
+ Value *vXu = FP_TO_UI(vXf, mSimdInt32Ty);
+ Value *vYu = FP_TO_UI(vYf, mSimdInt32Ty);
+
+ // stipple pattern is 32x32, which means that one line of stipple
+ // is stored in one word:
+ // vXstipple is bit offset inside 32-bit stipple word
+ // vYstipple is word index is stipple array
+ Value *vXstipple = AND(vXu, VIMMED1(0x1f)); // & (32-1)
+ Value *vYstipple = AND(vYu, VIMMED1(0x1f)); // & (32-1)
+
+ // grab stipple pattern base address
+ Value *stipplePtr = GEP(hPrivateData, {0, swr_draw_context_polyStipple, 0});
+ stipplePtr = BITCAST(stipplePtr, mInt8PtrTy);
+
+ // peform a gather to grab stipple words for each lane
+ Value *vStipple = GATHERDD(VUNDEF_I(), stipplePtr, vYstipple,
+ VIMMED1(0xffffffff), 4);
+
+ // create a mask with one bit corresponding to the x stipple
+ // and AND it with the pattern, to see if we have a bit
+ Value *vBitMask = LSHR(VIMMED1(0x80000000), vXstipple);
+ Value *vStippleMask = AND(vStipple, vBitMask);
+ vStippleMask = ICMP_NE(vStippleMask, VIMMED1(0));
+ vStippleMask = VMASK(vStippleMask);
+
+ if (swr_fs->info.base.uses_kill) {
+ vActiveMask = AND(vActiveMask, vStippleMask);
+ } else {
+ vActiveMask = vStippleMask;
+ }
+ }