-/* $Id$
-
-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