Add support for glBlendFuncSeparate().

I want it to fix glow-through-alpha, but this checkin doesn't includes any of those changes.

1 files changed, 48 insertions, 16 deletions

diff --git a/indra/llrender/llgl.cpp b/indra/llrender/llgl.cpp
index ec1bd353cb..4c256f4b06 100644
--- a/indra/llrender/llgl.cpp
+++ b/indra/llrender/llgl.cpp
@@ -2,25 +2,31 @@
  * @file llgl.cpp
  * @brief LLGL implementation
  *
- * $LicenseInfo:firstyear=2001&license=viewerlgpl$
- * Second Life Viewer Source Code
- * Copyright (C) 2010, Linden Research, Inc.
+ * $LicenseInfo:firstyear=2001&license=viewergpl$
+ * 
+ * Copyright (c) 2001-2009, Linden Research, Inc.
  * 
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation;
- * version 2.1 of the License only.
+ * Second Life Viewer Source Code
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
  * 
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at
+ * http://secondlifegrid.net/programs/open_source/licensing/flossexception
  * 
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
  * 
- * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
  * $/LicenseInfo$
  */
 
@@ -179,6 +185,9 @@ PFNGLRENDERBUFFERSTORAGEMULTISAMPLEEXTPROC glRenderbufferStorageMultisampleEXT =
 // GL_EXT_framebuffer_blit
 PFNGLBLITFRAMEBUFFEREXTPROC glBlitFramebufferEXT = NULL;
 
+// GL_EXT_blend_func_separate
+PFNGLBLENDFUNCSEPARATEEXTPROC glBlendFuncSeparateEXT = NULL;
+
 // GL_ARB_draw_buffers
 PFNGLDRAWBUFFERSARBPROC glDrawBuffersARB = NULL;
 
@@ -318,6 +327,7 @@ LLGLManager::LLGLManager() :
 	mHasCompressedTextures(FALSE),
 	mHasFramebufferObject(FALSE),
 	mHasFramebufferMultisample(FALSE),
+	mHasBlendFuncSeparate(FALSE),
 
 	mHasVertexBufferObject(FALSE),
 	mHasPBuffer(FALSE),
@@ -627,6 +637,12 @@ void LLGLManager::initExtensions()
 #else
 	mHasDrawBuffers = FALSE;
 # endif
+# if GL_EXT_blend_func_separate
+	mHasBlendFuncSeparate = TRUE;
+#else
+#error XXXXXX
+	mHasBlendFuncSeparate = FALSE;
+# endif
 	mHasMipMapGeneration = FALSE;
 	mHasSeparateSpecularColor = FALSE;
 	mHasAnisotropic = FALSE;
@@ -653,6 +669,7 @@ void LLGLManager::initExtensions()
 		&& ExtensionExists("GL_EXT_packed_depth_stencil", gGLHExts.mSysExts);
 	mHasFramebufferMultisample = mHasFramebufferObject && ExtensionExists("GL_EXT_framebuffer_multisample", gGLHExts.mSysExts);
 	mHasDrawBuffers = ExtensionExists("GL_ARB_draw_buffers", gGLHExts.mSysExts);
+	mHasBlendFuncSeparate = ExtensionExists("GL_EXT_blend_func_separate", gGLHExts.mSysExts);
 	mHasTextureRectangle = ExtensionExists("GL_ARB_texture_rectangle", gGLHExts.mSysExts);
 #if !LL_DARWIN
 	mHasPointParameters = !mIsATI && ExtensionExists("GL_ARB_point_parameters", gGLHExts.mSysExts);
@@ -676,6 +693,7 @@ void LLGLManager::initExtensions()
 		mHasFramebufferObject = FALSE;
 		mHasFramebufferMultisample = FALSE;
 		mHasDrawBuffers = FALSE;
+		mHasBlendFuncSeparate = FALSE;
 		mHasMipMapGeneration = FALSE;
 		mHasSeparateSpecularColor = FALSE;
 		mHasAnisotropic = FALSE;
@@ -700,6 +718,7 @@ void LLGLManager::initExtensions()
 		mHasShaderObjects = FALSE;
 		mHasVertexShader = FALSE;
 		mHasFragmentShader = FALSE;
+		mHasBlendFuncSeparate = FALSE;
 		LL_WARNS("RenderInit") << "GL extension support forced to SIMPLE level via LL_GL_BASICEXT" << LL_ENDL;
 	}
 	if (getenv("LL_GL_BLACKLIST"))	/* Flawfinder: ignore */
@@ -728,7 +747,8 @@ void LLGLManager::initExtensions()
 		if (strchr(blacklist,'r')) mHasDrawBuffers = FALSE;//S
 		if (strchr(blacklist,'s')) mHasFramebufferMultisample = FALSE;
 		if (strchr(blacklist,'t')) mHasTextureRectangle = FALSE;
-
+		if (strchr(blacklist,'u')) mHasBlendFuncSeparate = FALSE;//S
+		
 	}
 #endif // LL_LINUX || LL_SOLARIS
 	
@@ -776,6 +796,14 @@ void LLGLManager::initExtensions()
 	{
 		LL_INFOS("RenderInit") << "Couldn't initialize GL_ARB_fragment_shader" << LL_ENDL;
 	}
+	if (!mHasBlendFuncSeparate)
+	{
+		LL_INFOS("RenderInit") << "Couldn't initialize GL_EXT_blend_func_separate" << LL_ENDL;
+	}
+	if (!mHasDrawBuffers)
+	{
+		LL_INFOS("RenderInit") << "Couldn't initialize GL_ARB_draw_buffers" << LL_ENDL;
+	}
 
 	// Disable certain things due to known bugs
 	if (mIsIntel && mHasMipMapGeneration)
@@ -846,6 +874,10 @@ void LLGLManager::initExtensions()
 	{
 		glDrawBuffersARB = (PFNGLDRAWBUFFERSARBPROC) GLH_EXT_GET_PROC_ADDRESS("glDrawBuffersARB");
 	}
+	if (mHasBlendFuncSeparate)
+	{
+		glBlendFuncSeparateEXT = (PFNGLBLENDFUNCSEPARATEEXTPROC) GLH_EXT_GET_PROC_ADDRESS("glBlendFuncSeparateEXT");
+	}
 #if (!LL_LINUX && !LL_SOLARIS) || LL_LINUX_NV_GL_HEADERS
 	// This is expected to be a static symbol on Linux GL implementations, except if we use the nvidia headers - bah
 	glDrawRangeElements = (PFNGLDRAWRANGEELEMENTSPROC)GLH_EXT_GET_PROC_ADDRESS("glDrawRangeElements");