From 3fcac071202b0a805193b8d4900cf300d27ae1e4 Mon Sep 17 00:00:00 2001
From: Gregory Hainaut <gregory.hainaut@gmail.com>
Date: Wed, 6 May 2015 08:34:45 +0200
Subject: [PATCH] gsdx-ogl: print some message when blending is not properly
 supported

---
 plugins/GSdx/GSDeviceOGL.h     | 17 +++++++++++++----
 plugins/GSdx/GSRendererOGL.cpp |  6 ++++++
 2 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/plugins/GSdx/GSDeviceOGL.h b/plugins/GSdx/GSDeviceOGL.h
index fa844cb4af..9296228bf3 100644
--- a/plugins/GSdx/GSDeviceOGL.h
+++ b/plugins/GSdx/GSDeviceOGL.h
@@ -42,7 +42,8 @@ class GSBlendStateOGL {
 	GLenum m_equation_RGB;
 	GLenum m_func_sRGB;
 	GLenum m_func_dRGB;
-	bool   constant_factor;
+	bool   m_constant_factor;
+	char   m_bogus;
 
 public:
 
@@ -50,7 +51,8 @@ public:
 		, m_equation_RGB(0)
 		, m_func_sRGB(0)
 		, m_func_dRGB(0)
-		, constant_factor(false)
+		, m_constant_factor(false)
+		, m_bogus(0)
 	{}
 
 	void SetRGB(GLenum op, GLenum src, GLenum dst)
@@ -58,9 +60,11 @@ public:
 		m_equation_RGB = op;
 		m_func_sRGB = src;
 		m_func_dRGB = dst;
-		if (IsConstant(src) || IsConstant(dst)) constant_factor = true;
+		if (IsConstant(src) || IsConstant(dst)) m_constant_factor = true;
 	}
 
+	void SetBogus(char bogus) { m_bogus = bogus; }
+
 	void RevertOp()
 	{
 		if(m_equation_RGB == GL_FUNC_ADD)
@@ -73,7 +77,7 @@ public:
 
 	bool IsConstant(GLenum factor) { return ((factor == GL_CONSTANT_COLOR) || (factor == GL_ONE_MINUS_CONSTANT_COLOR)); }
 
-	bool HasConstantFactor() { return constant_factor; }
+	bool HasConstantFactor() { return m_constant_factor; }
 
 	void SetupBlend(float factor)
 	{
@@ -86,6 +90,11 @@ public:
 		}
 
 		if (m_enable) {
+#ifdef ENABLE_OGL_DEBUG
+			if (m_bogus) {
+				fprintf(stderr, "Bogus blending effect used : %s\n", (m_bogus == 1) ? "impossible effect" : "clear effect");
+			}
+#endif
 			if (HasConstantFactor()) {
 				if (GLState::bf != factor) {
 					GLState::bf = factor;
diff --git a/plugins/GSdx/GSRendererOGL.cpp b/plugins/GSdx/GSRendererOGL.cpp
index c83d2d1fd5..99a495a2bc 100644
--- a/plugins/GSdx/GSRendererOGL.cpp
+++ b/plugins/GSdx/GSRendererOGL.cpp
@@ -229,6 +229,9 @@ void GSRendererOGL::DrawPrims(GSTexture* rt, GSTexture* ds, GSTextureCache::Sour
 			{
 				//Breath of Fire Dragon Quarter triggers this in battles. Graphics are fine though.
 				//ASSERT(0);
+#ifdef ENABLE_OGL_DEBUG
+				fprintf(stderr, "env PABE  not supported\n");
+#endif
 			}
 		}
 	}
@@ -530,6 +533,9 @@ void GSRendererOGL::DrawPrims(GSTexture* rt, GSTexture* ds, GSTextureCache::Sour
 	dev->SetupCB(&vs_cb, &ps_cb, ps_sel.sprite ? &gs_cb : NULL);
 
 	if (DATE_GL42) {
+		// It could be good idea to use stencil in the same time.
+		// Early stencil test will reduce the number of atomic-load operation
+
 		// Create an r32i image that will contain primitive ID
 		// Note: do it at the beginning because the clean will dirty the FBO state
 		//dev->InitPrimDateTexture(rtsize.x, rtsize.y);