diff --git a/src/m_png.cpp b/src/m_png.cpp
index 65fad7761b..0405caef16 100644
--- a/src/m_png.cpp
+++ b/src/m_png.cpp
@@ -55,6 +55,12 @@
 // size of the compression buffer it allocates on the stack.
 #define PNG_WRITE_SIZE	32768
 
+// Set this to 1 to use a simple heuristic to select the filter to apply
+// for each row of RGB image saves. As it turns out, it seems no filtering
+// is the best for Doom screenshots, no matter what the heuristic might
+// determine, so that's why this is 0 here.
+#define USE_FILTER_HEURISTIC 0
+
 // TYPES -------------------------------------------------------------------
 
 struct IHDR
@@ -759,13 +765,12 @@ DWORD CalcSum(Byte *row, int len)
 //
 //==========================================================================
 
+#if USE_FILTER_HEURISTIC
 static int SelectFilter(Byte row[5][1 + MAXWIDTH*3], Byte prior[MAXWIDTH*3], int width)
 {
-#if 1
 	// As it turns out, it seems no filtering is the best for Doom screenshots,
 	// no matter what the heuristic might determine.
 	return 0;
-#else
 	DWORD sum;
 	DWORD bestsum;
 	int bestfilter;
@@ -880,8 +885,10 @@ static int SelectFilter(Byte row[5][1 + MAXWIDTH*3], Byte prior[MAXWIDTH*3], int
 	}
 
 	return bestfilter;
-#endif
 }
+#else
+#define SelectFilter(x,y,z)		0
+#endif
 
 //==========================================================================
 //
@@ -894,9 +901,13 @@ static int SelectFilter(Byte row[5][1 + MAXWIDTH*3], Byte prior[MAXWIDTH*3], int
 
 bool M_SaveBitmap(const BYTE *from, ESSType color_type, int width, int height, int pitch, FILE *file)
 {
+#if USE_FILTER_HEURISTIC
 	Byte prior[MAXWIDTH*3];
-	Byte buffer[PNG_WRITE_SIZE];
 	Byte temprow[5][1 + MAXWIDTH*3];
+#else
+	Byte temprow[1][1 + MAXWIDTH*3];
+#endif
+	Byte buffer[PNG_WRITE_SIZE];
 	z_stream stream;
 	int err;
 	int y;
@@ -917,17 +928,19 @@ bool M_SaveBitmap(const BYTE *from, ESSType color_type, int width, int height, i
 	stream.avail_out = sizeof(buffer);
 
 	temprow[0][0] = 0;
+#if USE_FILTER_HEURISTIC
 	temprow[1][0] = 1;
 	temprow[2][0] = 2;
 	temprow[3][0] = 3;
 	temprow[4][0] = 4;
 
-	// Fill the prior row to 0 for RGB images. Paletted is always filter 0,
+	// Fill the prior row with 0 for RGB images. Paletted is always filter 0,
 	// so it doesn't need this.
 	if (color_type != SS_PAL)
 	{
 		memset(prior, 0, width * 3);
 	}
+#endif
 
 	while (y-- > 0 && err == Z_OK)
 	{
@@ -957,11 +970,13 @@ bool M_SaveBitmap(const BYTE *from, ESSType color_type, int width, int height, i
 			stream.avail_in = width * 3 + 1;
 			break;
 		}
+#if USE_FILTER_HEURISTIC
 		if (color_type != SS_PAL)
 		{
 			// Save this row for filter calculations on the next row.
 			memcpy (prior, &temprow[0][1], stream.avail_in - 1);
 		}
+#endif
 
 		from += pitch;
 
diff --git a/src/win32/fb_d3d9.cpp b/src/win32/fb_d3d9.cpp
index 52a073138b..d1568180a5 100644
--- a/src/win32/fb_d3d9.cpp
+++ b/src/win32/fb_d3d9.cpp
@@ -296,17 +296,12 @@ D3DFB::D3DFB (int width, int height, bool fullscreen)
 	HRESULT hr;
 
 	if (FAILED(hr = D3D->CreateDevice (D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, Window,
-		D3DCREATE_SOFTWARE_VERTEXPROCESSING | D3DCREATE_FPU_PRESERVE, &d3dpp, &D3DDevice)))
+		D3DCREATE_HARDWARE_VERTEXPROCESSING | D3DCREATE_FPU_PRESERVE, &d3dpp, &D3DDevice)))
 	{
-		D3DDevice = NULL;
-		if (fullscreen)
+		if (FAILED(D3D->CreateDevice (D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, Window,
+			D3DCREATE_SOFTWARE_VERTEXPROCESSING | D3DCREATE_FPU_PRESERVE, &d3dpp, &D3DDevice)))
 		{
-			d3dpp.BackBufferFormat = D3DFMT_R5G6B5;
-			if (FAILED(D3D->CreateDevice (D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, Window,
-				D3DCREATE_SOFTWARE_VERTEXPROCESSING | D3DCREATE_FPU_PRESERVE, &d3dpp, &D3DDevice)))
-			{
-				D3DDevice = NULL;
-			}
+			D3DDevice = NULL;
 		}
 	}
 	if (D3DDevice != NULL)
@@ -3062,12 +3057,13 @@ void D3DFB::SetTexture(int tnum, IDirect3DTexture9 *texture)
 	}
 }
 
+CVAR(Float, pal, 0.5f, 0)
 void D3DFB::SetPaletteTexture(IDirect3DTexture9 *texture, int count)
 {
 	if (count == 256 || SM14)
 	{
 		// Shader Model 1.4 only uses 256-color palettes.
-		SetConstant(2, 255 / 256.f, 0.5f / 256.f, 0, 0);
+		SetConstant(2, 255 / 256.f, pal / 256.f, 0, 0);
 	}
 	else
 	{
@@ -3083,7 +3079,7 @@ void D3DFB::SetPaletteTexture(IDirect3DTexture9 *texture, int count)
 		// The constant register c2 is used to hold the multiplier in the
 		// x part and the adder in the y part.
 		float fcount = 1 / float(count);
-		SetConstant(2, 255 * fcount, 0.5f * fcount, 0, 0);
+		SetConstant(2, 255 * fcount, pal * fcount, 0, 0);
 	}
 	SetTexture(1, texture);
 }