diff --git a/GPU/Software/Clipper.cpp b/GPU/Software/Clipper.cpp
index be9acb8c19..548d9e3dfd 100644
--- a/GPU/Software/Clipper.cpp
+++ b/GPU/Software/Clipper.cpp
@@ -208,7 +208,7 @@ void ProcessRect(const VertexData& v0, const VertexData& v1)
 		bool state_check = !gstate.isModeClear();
 		bool alpha_check = true;
 		if ((coord_check || !gstate.isTextureMapEnabled()) && state_check && alpha_check) {
-			Rasterizer::DrawPSXSprite(v0, v1);
+			Rasterizer::DrawSprite(v0, v1);
 			return;
 		}
 
diff --git a/GPU/Software/Rasterizer.cpp b/GPU/Software/Rasterizer.cpp
index cd90f89fac..c2d9b84a14 100644
--- a/GPU/Software/Rasterizer.cpp
+++ b/GPU/Software/Rasterizer.cpp
@@ -1287,19 +1287,60 @@ void DrawTriangleSlice(
 	}
 }
 
-// Slow but can handle all input.
-void SafeScanline(int s, int ds, int t, int x1, int x2, int y, int z, const u8 *texptr, int texbufw, Sampler::Funcs &sampler, Vec4<int> v0_color) {
-	for (int x = x1; x < x2; x++) {
-		Vec4<int> prim_color = v0_color;
-		Vec4<int> tex_color = Vec4<int>::FromRGBA(sampler.nearest(s, t, texptr, texbufw, 0));
-		prim_color = GetTextureFunctionOutput(prim_color, tex_color);
-		DrawingCoords pos(x, y, z);
-		DrawSinglePixel<false>(pos, (u16)z, 1.0f, prim_color);
-		s += ds;
-	}
+
+// Through mode, with the specific Darkstalker settings.
+inline void DrawSinglePixel5551(const DrawingCoords &p, const Vec4<int> &color_in) {
+	Vec4<int> prim_color = color_in;
+	if (prim_color.a() == 0)
+		return;
+
+	const u32 old_color = GetPixelColor(p.x, p.y);
+	u32 new_color;
+
+	u8 stencil = GetPixelStencil(p.x, p.y);
+
+	const Vec4<int> dst = Vec4<int>::FromRGBA(old_color);
+	Vec3<int> blended = AlphaBlendingResult(prim_color, dst);
+
+	// ToRGB() always automatically clamps.
+	new_color = blended.ToRGB();
+	new_color |= stencil << 24;
+	new_color = (new_color & ~gstate.getColorMask()) | (old_color & gstate.getColorMask());
+	SetPixelColor(p.x, p.y, new_color);
 }
 
-void DrawPSXSprite(const VertexData& v0, const VertexData& v1) {
+static inline Vec4<int> ModulateRGBA(const Vec4<int>& prim_color, const Vec4<int>& texcolor) {
+	Vec3<int> out_rgb;
+	int out_a;
+
+#if defined(_M_SSE)
+	// We can be accurate up to 24 bit integers, should be enough.
+	const __m128 p = _mm_cvtepi32_ps(prim_color.ivec);
+	const __m128 t = _mm_cvtepi32_ps(texcolor.ivec);
+	const __m128 b = _mm_mul_ps(p, t);
+	if (gstate.isColorDoublingEnabled()) {
+		// We double right here, only for modulate.  Other tex funcs do not color double.
+		const __m128 doubleColor = _mm_setr_ps(2.0f / 255.0f, 2.0f / 255.0f, 2.0f / 255.0f, 1.0f / 255.0f);
+		out_rgb.ivec = _mm_cvtps_epi32(_mm_mul_ps(b, doubleColor));
+	} else {
+		out_rgb.ivec = _mm_cvtps_epi32(_mm_mul_ps(b, _mm_set_ps1(1.0f / 255.0f)));
+	}
+	return Vec4<int>(out_rgb.ivec);
+#else
+	if (gstate.isColorDoublingEnabled()) {
+		out_rgb = (prim_color.rgb() * texcolor.rgb() * 2) / 255;
+	} else {
+		out_rgb = prim_color.rgb() * texcolor.rgb() / 255;
+	}
+	out_a = (rgba) ? (prim_color.a() * texcolor.a() / 255) : prim_color.a();
+#endif
+
+	return Vec4<int>(out_rgb.r(), out_rgb.g(), out_rgb.b(), out_a);
+
+}
+
+
+void DrawSprite(const VertexData& v0, const VertexData& v1) {
 	const u8 *texptr = nullptr;
 
 	GETextureFormat texfmt = gstate.getTextureFormat();
@@ -1309,7 +1350,7 @@ void DrawPSXSprite(const VertexData& v0, const VertexData& v1) {
 		texptr = Memory::GetPointerUnchecked(texaddr);
 
 	ScreenCoords pprime(v0.screenpos.x, v0.screenpos.y, 0);
-	Sampler::Funcs sampler = Sampler::GetFuncs();
+	Sampler::NearestFunc nearestFunc = Sampler::GetNearestFunc();  // Looks at gstate.
 
 	DrawingCoords pos0 = TransformUnit::ScreenToDrawing(v0.screenpos);
 	DrawingCoords pos1 = TransformUnit::ScreenToDrawing(v1.screenpos);
@@ -1347,21 +1388,47 @@ void DrawPSXSprite(const VertexData& v0, const VertexData& v1) {
 			pos0.y = scissorTL.y;
 		}
 
-		int t = t_start;
-		for (int y = pos0.y; y < pos1.y; y++) {
-			int s = s_start;
-			SafeScanline(s, ds, t, pos0.x, pos1.x, y, z, texptr, texbufw, sampler, v0.color0);
-			/*
-			for (int x = pos0.x; x < pos1.x; x++) {
-				Vec4<int> prim_color = v0.color0;
-				Vec4<int> tex_color = Vec4<int>::FromRGBA(sampler.nearest(s, t, texptr, texbufw, 0));
-				prim_color = GetTextureFunctionOutput(prim_color, tex_color);
-				DrawingCoords pos(x, y, z);
-				DrawSinglePixel<false>(pos, (u16)z, fog, prim_color);
-				s += ds;
+		if (!gstate.isStencilTestEnabled() &&
+			!gstate.isDepthTestEnabled() &&
+			!gstate.isLogicOpEnabled() &&
+			!gstate.isColorTestEnabled() &&
+			!gstate.isDitherEnabled() &&
+			gstate.isAlphaTestEnabled() &&
+			gstate.getAlphaTestRef() == 0 &&
+			gstate.getAlphaTestMask() == 0xFF &&
+			gstate.isAlphaBlendEnabled() &&
+			gstate.isTextureAlphaUsed() &&
+			gstate.getTextureFunction() == GE_TEXFUNC_MODULATE &&
+			gstate.FrameBufFormat() == GE_FORMAT_5551) {
+			int t = t_start;
+			for (int y = pos0.y; y < pos1.y; y++) {
+				int s = s_start;
+				// Not really that fast but faster than triangle.
+				for (int x = pos0.x; x < pos1.x; x++) {
+					Vec4<int> prim_color = v0.color0;
+					Vec4<int> tex_color = Vec4<int>::FromRGBA(nearestFunc(s, t, texptr, texbufw, 0));
+					prim_color = ModulateRGBA(prim_color, tex_color);
+					DrawingCoords pos(x, y, z);
+					DrawSinglePixel5551(pos, prim_color);
+					s += ds;
+				}
+				t += dt;
+			}
+		} else {
+			int t = t_start;
+			for (int y = pos0.y; y < pos1.y; y++) {
+				int s = s_start;
+				// Not really that fast but faster than triangle.
+				for (int x = pos0.x; x < pos1.x; x++) {
+					Vec4<int> prim_color = v0.color0;
+					Vec4<int> tex_color = Vec4<int>::FromRGBA(nearestFunc(s, t, texptr, texbufw, 0));
+					prim_color = GetTextureFunctionOutput(prim_color, tex_color);
+					DrawingCoords pos(x, y, z);
+					DrawSinglePixel<false>(pos, (u16)z, 1.0f, prim_color);
+					s += ds;
+				}
+				t += dt;
 			}
-			*/
-			t += dt;
 		}
 	} else {
 		if (pos1.x > scissorBR.x) pos1.x = scissorBR.x;
diff --git a/GPU/Software/Rasterizer.h b/GPU/Software/Rasterizer.h
index 076a0421a5..df3075e3a0 100644
--- a/GPU/Software/Rasterizer.h
+++ b/GPU/Software/Rasterizer.h
@@ -27,7 +27,7 @@ namespace Rasterizer {
 void DrawTriangle(const VertexData& v0, const VertexData& v1, const VertexData& v2);
 void DrawPoint(const VertexData &v0);
 void DrawLine(const VertexData &v0, const VertexData &v1);
-void DrawPSXSprite(const VertexData &v0, const VertexData &v1);
+void DrawSprite(const VertexData &v0, const VertexData &v1);
 void ClearRectangle(const VertexData &v0, const VertexData &v1);
 
 bool GetCurrentStencilbuffer(GPUDebugBuffer &buffer);