diff --git a/plugins/GSdx/GSRendererHW.cpp b/plugins/GSdx/GSRendererHW.cpp
index 3087cb5e25..3f00a4ccc3 100644
--- a/plugins/GSdx/GSRendererHW.cpp
+++ b/plugins/GSdx/GSRendererHW.cpp
@@ -379,8 +379,8 @@ void GSRendererHW::Draw()
 		if (m_vertex.next == 4) {
 			// Note potentially we could also check the content of vertex (2nd
 			// sprite must be half of the first one)
-			m_double_downscale = true;
 			GL_INS("Double downscale effect detected");
+			m_double_downscale = true;
 		} else if ((m_context->TEX0.PSM == PSM_PSMT8) && (delta_p.x <= 64.0f) && (delta_p.y <= 32.0f)) {
 			//fprintf(stderr, "delta_p %f %f\n", delta_p.x, delta_p.y);
 			if (m_channel_shuffle) {
diff --git a/plugins/GSdx/GSRendererOGL.cpp b/plugins/GSdx/GSRendererOGL.cpp
index 3d29e72df2..9ce7044eb3 100644
--- a/plugins/GSdx/GSRendererOGL.cpp
+++ b/plugins/GSdx/GSRendererOGL.cpp
@@ -746,6 +746,23 @@ void GSRendererOGL::DrawPrims(GSTexture* rt, GSTexture* ds, GSTextureCache::Sour
 		}
 	}
 
+	// Special Draw Call
+	if (m_channel_shuffle) {
+
+		if (m_context->CLAMP.WMS == 3 && ((m_context->CLAMP.MAXU & 0x8) == 8)) {
+			// Read either blue or Alpha. Let's go for Blue ;)
+			// MGS3/Kill Zone
+			GL_INS("Blue channel");
+		} else if (m_context->CLAMP.WMS == 3 && ((m_context->CLAMP.MINU & 0x8) == 0)) {
+			// Read either Red or Green. Let's go for Red ;)
+			// Pop
+			GL_INS("Red channel");
+		} else {
+			GL_INS("channel not supported");
+			ASSERT(0);
+		}
+	}
+
 	//
 
 	dev->BeginScene();