From f4278247ed7f9d8db221bc2c1a062227442e99bc Mon Sep 17 00:00:00 2001
From: Henrik Rydgard <hrydgard@gmail.com>
Date: Sun, 25 Nov 2012 15:47:26 +0100
Subject: [PATCH] glstate: Support glBlendColor

---
 gfx_es2/gl_state.h | 30 ++++++++++++++++++++++++++----
 1 file changed, 26 insertions(+), 4 deletions(-)

diff --git a/gfx_es2/gl_state.h b/gfx_es2/gl_state.h
index d2805bdf9c..66925754a3 100644
--- a/gfx_es2/gl_state.h
+++ b/gfx_es2/gl_state.h
@@ -12,7 +12,11 @@
 #endif
 #endif
 #include <functional>
+#include <string.h>
 
+
+// OpenGL state cache. Should convert all code to use this instead of directly calling glEnable etc,
+// as GL state changes can be expensive on some hardware.
 class OpenGLState
 {
 private:
@@ -56,7 +60,7 @@ private:
 	class SavedState1_##func { \
 		p1type p1; \
 	public: \
-	SavedState1_##func() : p1(p1def) {}; \
+		SavedState1_##func() : p1(p1def) {}; \
 		void set(p1type newp1) { \
 			if(newp1 != p1) { \
 				p1 = newp1; \
@@ -73,7 +77,7 @@ private:
 		p1type p1; \
 		p2type p2; \
 	public: \
-	SavedState2_##func() : p1(p1def), p2(p2def) {}; \
+		SavedState2_##func() : p1(p1def), p2(p2def) {}; \
 		inline void set(p1type newp1, p2type newp2) { \
 			if(newp1 != p1 || newp2 != p2) { \
 				p1 = newp1; \
@@ -86,10 +90,26 @@ private:
 		} \
 	}
 
+#define STATEFLOAT4(func, def) \
+	class SavedState4_##func { \
+		float p[4]; \
+	public: \
+		SavedState4_##func() { \
+			for (int i = 0; i < 4; i++) {p[i] = def;} \
+		}; \
+		inline void set(const float v[4]) { \
+			if(memcmp(p,v,sizeof(float)*4)) { \
+				memcpy(p,v,sizeof(float)*4); \
+				func(p[0], p[1], p[2], p[3]); \
+			} \
+		} \
+		inline void restore() { \
+			func(p[0], p[1], p[2], p[3]); \
+		} \
+	}
+
 	bool initialized;
 
-
-
 public:
 	OpenGLState() : initialized(false) {}
 	void Initialize();
@@ -98,6 +118,7 @@ public:
 	BoolState<GL_BLEND, false> blend;
 	STATE2(glBlendFunc, GLenum, GLenum, GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) blendFunc;
 	STATE1(glBlendEquation, GLenum, GL_FUNC_ADD) blendEquation;
+	STATEFLOAT4(glBlendColor, 1.0f) blendColor;
 
 	BoolState<GL_CULL_FACE, false> cullFace;
 	STATE1(glCullFace, GLenum, GL_FRONT) cullFaceMode;
@@ -105,6 +126,7 @@ public:
 	BoolState<GL_DEPTH_TEST, false> depthTest;
 	STATE1(glDepthFunc, GLenum, GL_LESS) depthFunc;
 	STATE2(glDepthRangef, float, float, 0.f, 1.f) depthRange;
+
 };
 
 #undef STATE1