X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fcore%2Fblend.cpp;fp=source%2Fcore%2Fblend.cpp;h=3327885c74c1ef34b7a5c1d111f22935a8639de0;hb=7aaec9a70b8d7733429bec043f8e33e02956f266;hp=0000000000000000000000000000000000000000;hpb=bec07999d95b76f4b47cffcc564d0cd0afc0435e;p=libs%2Fgl.git

diff --git a/source/core/blend.cpp b/source/core/blend.cpp
new file mode 100644
index 00000000..3327885c
--- /dev/null
+++ b/source/core/blend.cpp
@@ -0,0 +1,127 @@
+#include <msp/gl/extensions/ext_blend_minmax.h>
+#include <msp/gl/extensions/ext_blend_subtract.h>
+#include <msp/strings/format.h>
+#include "blend.h"
+
+using namespace std;
+
+namespace Msp {
+namespace GL {
+
+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()
+{
+	if(set_current(0))
+		glDisable(GL_BLEND);
+}
+
+const Blend &Blend::alpha()
+{
+	static Blend blend(SRC_ALPHA, ONE_MINUS_SRC_ALPHA);
+	return blend;
+}
+
+const Blend &Blend::additive()
+{
+	static Blend blend(ONE, ONE);
+	return blend;
+}
+
+const Blend &Blend::additive_alpha()
+{
+	static Blend blend(SRC_ALPHA, ONE);
+	return blend;
+}
+
+void operator>>(const LexicalConverter &conv, BlendFactor &factor)
+{
+	const string &str = conv.get();
+	if(str=="ZERO")
+		factor = ZERO;
+	else if(str=="ONE")
+		factor = ONE;
+	else if(str=="SRC_COLOR")
+		factor = SRC_COLOR;
+	else if(str=="ONE_MINUS_SRC_COLOR")
+		factor = ONE_MINUS_SRC_COLOR;
+	else if(str=="SRC_ALPHA")
+		factor = SRC_ALPHA;
+	else if(str=="ONE_MINUS_SRC_ALPHA")
+		factor = ONE_MINUS_SRC_ALPHA;
+	else if(str=="DST_COLOR")
+		factor = DST_COLOR;
+	else if(str=="ONE_MINUS_DST_COLOR")
+		factor = ONE_MINUS_DST_COLOR;
+	else if(str=="DST_ALPHA")
+		factor = DST_ALPHA;
+	else if(str=="ONE_MINUS_DST_ALPHA")
+		factor = ONE_MINUS_DST_ALPHA;
+	else if(str=="CONSTANT_COLOR")
+		factor = CONSTANT_COLOR;
+	else if(str=="ONE_MINUS_CONSTANT_COLOR")
+		factor = ONE_MINUS_CONSTANT_COLOR;
+	else if(str=="CONSTANT_ALPHA")
+		factor = CONSTANT_ALPHA;
+	else if(str=="ONE_MINUS_CONSTANT_ALPHA")
+		factor = ONE_MINUS_CONSTANT_ALPHA;
+	else
+		throw lexical_error(format("conversion of '%s' to BlendFactor", str));
+}
+
+void operator<<(LexicalConverter &conv, BlendFactor factor)
+{
+	switch(factor)
+	{
+	case ZERO: conv.result("ZERO"); break;
+	case ONE: conv.result("ONE"); break;
+	case SRC_COLOR: conv.result("SRC_COLOR"); break;
+	case ONE_MINUS_SRC_COLOR: conv.result("ONE_MINUS_SRC_COLOR"); break;
+	case SRC_ALPHA: conv.result("SRC_ALPHA"); break;
+	case ONE_MINUS_SRC_ALPHA: conv.result("ONE_MINUS_SRC_ALPHA"); break;
+	case DST_COLOR: conv.result("DST_COLOR"); break;
+	case ONE_MINUS_DST_COLOR: conv.result("ONE_MINUS_DST_COLOR"); break;
+	case DST_ALPHA: conv.result("DST_ALPHA"); break;
+	case ONE_MINUS_DST_ALPHA: conv.result("ONE_MINUS_DST_ALPHA"); break;
+	case CONSTANT_COLOR: conv.result("CONSTANT_COLOR"); break;
+	case ONE_MINUS_CONSTANT_COLOR: conv.result("ONE_MINUS_CONSTANT_COLOR"); break;
+	case CONSTANT_ALPHA: conv.result("CONSTANT_ALPHA"); break;
+	case ONE_MINUS_CONSTANT_ALPHA: conv.result("ONE_MINUS_CONSTANT_ALPHA"); break;
+	default: conv.result(format("BlendFactor(%#x)", static_cast<int>(factor)));
+	}
+}
+
+} // namespace GL
+} // namespace Msp