X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fcore%2Fblend.h;h=874230c682c9ccf82e21c88a644f1dc61aa6034d;hb=cdefdb4b0f94613c2b41757fb33ae155efa9a205;hp=ad7ba241bd1b1028e7e1bea45b5477f6b66245f6;hpb=24b24e2203c776aacd9744bb947f5cf47b03d328;p=libs%2Fgl.git

diff --git a/source/core/blend.h b/source/core/blend.h
index ad7ba241..874230c6 100644
--- a/source/core/blend.h
+++ b/source/core/blend.h
@@ -8,7 +8,7 @@
 namespace Msp {
 namespace GL {
 
-enum BlendEquation
+enum BlendEquation: std::uint8_t
 {
 	ADD,
 	SUBTRACT,
@@ -17,7 +17,7 @@ enum BlendEquation
 	MAX
 };
 
-enum BlendFactor
+enum BlendFactor: std::uint8_t
 {
 	ZERO,
 	ONE,
@@ -35,8 +35,18 @@ enum BlendFactor
 	ONE_MINUS_CONSTANT_ALPHA
 };
 
+enum ColorWriteMask: std::uint8_t
+{
+	WRITE_NONE = 0,
+	WRITE_RED = 1,
+	WRITE_GREEN = 2,
+	WRITE_BLUE = 4,
+	WRITE_ALPHA = 8,
+	WRITE_ALL = 15
+};
+
 /**
-Blends incoming fragments with those already in the framebuffer.
+Blends incoming fragment color values with those already in the framebuffer.
 */
 struct Blend
 {
@@ -51,19 +61,32 @@ struct Blend
 		void factors(BlendFactor, BlendFactor);
 	};
 
-	bool enabled;
-	BlendEquation equation;
-	BlendFactor src_factor;
-	BlendFactor dst_factor;
-	Color constant;
+	bool enabled = false;
+	BlendEquation equation = ADD;
+	BlendFactor src_factor = ONE;
+	BlendFactor dst_factor = ZERO;
+	Color constant = { 0.0f, 0.0f, 0.0f, 0.0f };
+	ColorWriteMask write_mask = WRITE_ALL;
+	bool alpha_to_coverage = false;
 
-	Blend();
+	Blend() = default;
 	Blend(BlendFactor, BlendFactor);
 	Blend(BlendEquation, BlendFactor, BlendFactor);
+
+	bool operator==(const Blend &) const;
+	bool operator!=(const Blend &b) const { return !operator==(b); }
 };
 
-unsigned get_gl_blend_equation(BlendEquation);
-unsigned get_gl_blend_factor(BlendFactor);
+inline bool Blend::operator==(const Blend &other) const
+{
+	return enabled==other.enabled && equation==other.equation && src_factor==other.src_factor &&
+		dst_factor==other.dst_factor && constant==other.constant && write_mask==other.write_mask &&
+		alpha_to_coverage==other.alpha_to_coverage;
+}
+
+
+inline ColorWriteMask operator|(ColorWriteMask m1, ColorWriteMask m2)
+{ return static_cast<ColorWriteMask>(static_cast<int>(m1)|static_cast<int>(m2)); }
 
 void operator>>(const LexicalConverter &, BlendEquation &);
 void operator<<(LexicalConverter &, BlendEquation);
@@ -71,7 +94,12 @@ void operator<<(LexicalConverter &, BlendEquation);
 void operator>>(const LexicalConverter &, BlendFactor &);
 void operator<<(LexicalConverter &, BlendFactor);
 
+void operator>>(const LexicalConverter &, ColorWriteMask &);
+void operator<<(LexicalConverter &, ColorWriteMask);
+
 } // namespace GL
 } // namespace Msp
 
+#include "blend_backend.h"
+
 #endif