From 6c6ed5f44313530d353859d89e652a850438f24d Mon Sep 17 00:00:00 2001
From: Gregory Hainaut <gregory.hainaut@gmail.com>
Date: Sun, 25 Sep 2016 10:05:44 +0200
Subject: [PATCH] gsdx ogl: trigger the special RW framebuffer shader when only
 Alpha is written (#1588)

* gsdx ogl: trigger the special RW framebuffer shader when only Alpha is written

It will work for both Jak and Ratchet&Clank and without CRC
---
 plugins/GSdx/GSCrc.cpp         | 6 ------
 plugins/GSdx/GSCrc.h           | 4 ----
 plugins/GSdx/GSRendererOGL.cpp | 3 ++-
 3 files changed, 2 insertions(+), 11 deletions(-)

diff --git a/plugins/GSdx/GSCrc.cpp b/plugins/GSdx/GSCrc.cpp
index 91eb74902f..f6b4dd700a 100644
--- a/plugins/GSdx/GSCrc.cpp
+++ b/plugins/GSdx/GSCrc.cpp
@@ -515,12 +515,6 @@ CRC::Game CRC::m_games[] =
 	{0XE1BF5DCA, SuperManReturns, US, 0},
 	{0x06A7506A, SacredBlaze, JP, 0},
 	{0x4CE7FB04, ItadakiStreet, JP, 0},
-	{0x9C712FF0, Jak1, EU, 0},
-	{0x472E7699, Jak1, US, 0},
-	{0x2479F4A9, Jak2, EU, 0},
-	{0x12804727, Jak3, EU, 0},
-	{0x644CFD03, Jak3, US, 0},
-	{0xDF659E77, JakX, EU, 0},
 };
 
 map<uint32, CRC::Game*> CRC::m_map;
diff --git a/plugins/GSdx/GSCrc.h b/plugins/GSdx/GSCrc.h
index 2ad2c2adb0..5ee7ceba4b 100644
--- a/plugins/GSdx/GSCrc.h
+++ b/plugins/GSdx/GSCrc.h
@@ -175,10 +175,6 @@ public:
 		SacredBlaze,
 		SuperManReturns,
 		ItadakiStreet,
-		Jak1,
-		Jak2,
-		Jak3,
-		JakX,
 		TitleCount,
 	};
 
diff --git a/plugins/GSdx/GSRendererOGL.cpp b/plugins/GSdx/GSRendererOGL.cpp
index d63b3aeafb..8acfd2ee00 100644
--- a/plugins/GSdx/GSRendererOGL.cpp
+++ b/plugins/GSdx/GSRendererOGL.cpp
@@ -1155,7 +1155,8 @@ void GSRendererOGL::DrawPrims(GSTexture* rt, GSTexture* ds, GSTextureCache::Sour
 	// Always check if primitive overlap. The function will return PRIM_OVERLAP_UNKNOW for non sprite primitive
 	m_prim_overlap = PrimitiveOverlap();
 	if ((m_context->FRAME.Block() == m_context->TEX0.TBP0) && PRIM->TME && m_sw_blending && (m_prim_overlap != PRIM_OVERLAP_NO) && (m_vertex.next > 2)) {
-		if (m_game.title == CRC::Jak1 || m_game.title == CRC::Jak2 || m_game.title == CRC::Jak3 || m_game.title == CRC::JakX) {
+		if (m_context->FRAME.FBMSK == 0x00FFFFFF) {
+			// Ratchet & Clank / Jak uses this pattern to compute the shadows. Alpha (multiplication) tfx is mostly equivalent to -1/+1 stencil operation
 			GL_INS("ERROR: Source and Target are the same! Let's sample the framebuffer");
 			m_ps_sel.tex_is_fb = 1;
 			m_require_full_barrier = true;