Draw smoke particles with fog enabled (#1186)

Author: Murugo

Common/Settings.h

@@ -134,6 +134,7 @@
 	visit(SetSixtyFPS, true) \
 	visit(SetSwapEffectUpgradeShim, false) \
 	visit(ShowerRoomFlashlightFix, true) \
+	visit(SmokeFogFix, true) \
 	visit(Southpaw, false) \
 	visit(SpecificSoundLoopFix, true) \
 	visit(SpecularFix, true) \
@@ -281,6 +282,7 @@
 	visit(ShowerRoomFlashlightFix) \
 	visit(SmallFontHeight) \
 	visit(SmallFontWidth) \
+	visit(SmokeFogFix) \
 	visit(SpaceSize) \
 	visit(water_spec_mult_apt_staircase) \
 	visit(water_spec_mult_strange_area) \

Wrappers/d3d8/IDirect3DDevice8.cpp

@@ -2569,6 +2569,17 @@ HRESULT m_IDirect3DDevice8::DrawPrimitiveUP(D3DPRIMITIVETYPE PrimitiveType, UINT
 		}
 	}
 
+	// Draw smoke particles with fog enabled
+	if (SmokeFogFix && PrimitiveType == D3DPT_TRIANGLESTRIP && PrimitiveCount == 2 && VertexStreamZeroStride == 24 &&
+		pVertexStreamZeroData && GetEventIndex() == EVENT_IN_GAME)
+	{
+		CUSTOMVERTEX_TEX1 *pVertex = (CUSTOMVERTEX_TEX1*)pVertexStreamZeroData;
+		if (fabs(pVertex[0].x + 200.0f) < 1e-6 && fabs(pVertex[0].y + 400.0f) < 1e-6) {
+			ProxyInterface->SetRenderState(D3DRS_FOGENABLE, TRUE);
+			ProxyInterface->SetRenderState(D3DRS_FOGTABLEMODE, D3DFOG_LINEAR);
+		}
+	}
+
 	return ProxyInterface->DrawPrimitiveUP(PrimitiveType, PrimitiveCount, pVertexStreamZeroData, VertexStreamZeroStride);
 }