X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fblend.cpp;h=184d5ad534f1aca6bcf441726b54e8c80af94a1b;hb=3b159edbe4e80a2bc19c4c2fcd42cb996b9fbfe0;hp=c9407c2130fe3e7bb9d0770ee194ded9bd8d2649;hpb=1bff68e595a66f3755743a7ee0f974eb876f3520;p=libs%2Fgl.git

diff --git a/source/blend.cpp b/source/blend.cpp
index c9407c21..184d5ad5 100644
--- a/source/blend.cpp
+++ b/source/blend.cpp
@@ -1,24 +1,54 @@
-/* $Id$
-
-This file is part of libmspgl
-Copyright © 2008  Mikko Rasa, Mikkosoft Productions
-Distributed under the LGPL
-*/
-
-#define GL_GLEXT_PROTOTYPES
+#include <msp/gl/extensions/ext_blend_minmax.h>
+#include <msp/gl/extensions/ext_blend_subtract.h>
 #include "blend.h"
 
 namespace Msp {
 namespace GL {
 
-void blend_equation(BlendEquation eq)
+Blend::Blend():
+	eq(ADD),
+	src_factor(ONE),
+	dst_factor(ZERO)
+{ }
+
+Blend::Blend(BlendFactor sf, BlendFactor df):
+	eq(ADD),
+	src_factor(sf),
+	dst_factor(df)
+{ }
+
+Blend::Blend(BlendEquation e, BlendFactor sf, BlendFactor df):
+	eq(e),
+	src_factor(sf),
+	dst_factor(df)
+{
+	if(eq==MIN || eq==MAX)
+		static Require _req(EXT_blend_minmax);
+	else if(eq==SUBTRACT || eq==REVERSE_SUBTRACT)
+		static Require _req(EXT_blend_subtract);
+}
+
+void Blend::bind() const
+{
+	if(set_current(this))
+	{
+		glEnable(GL_BLEND);
+		if(EXT_blend_minmax)
+			glBlendEquation(eq);
+		glBlendFunc(src_factor, dst_factor);
+	}
+}
+
+void Blend::unbind()
 {
-	glBlendEquation(eq);
+	if(set_current(0))
+		glDisable(GL_BLEND);
 }
 
-void blend_func(BlendFactor src, BlendFactor dst)
+const Blend &Blend::alpha()
 {
-	glBlendFunc(src, dst);
+	static Blend blend(SRC_ALPHA, ONE_MINUS_SRC_ALPHA);
+	return blend;
 }
 
 } // namespace GL