From 658d44cb461c2c60ce86ab48efa918f242c33196 Mon Sep 17 00:00:00 2001
From: havoc <havoc@d7cf8633-e32d-0410-b094-e92efae38249>
Date: Thu, 20 Apr 2006 01:47:26 +0000
Subject: [PATCH] added GL_AlphaTest function to enable/disable GL_ALPHA_TEST

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@6313 d7cf8633-e32d-0410-b094-e92efae38249
---
 gl_backend.c | 18 ++++++++++++++++++
 gl_backend.h |  1 +
 2 files changed, 19 insertions(+)

diff --git a/gl_backend.c b/gl_backend.c
index a3b6747d..ca2b7104 100644
--- a/gl_backend.c
+++ b/gl_backend.c
@@ -396,6 +396,7 @@ static struct gl_state_s
 	GLboolean depthmask;
 	int colormask; // stored as bottom 4 bits: r g b a (3 2 1 0 order)
 	int depthtest;
+	int alphatest;
 	int scissortest;
 	unsigned int unit;
 	unsigned int clientunit;
@@ -503,6 +504,7 @@ void GL_Backend_ResetState(void)
 {
 	memset(&gl_state, 0, sizeof(gl_state));
 	gl_state.depthtest = true;
+	gl_state.alphatest = false;
 	gl_state.blendfunc1 = GL_ONE;
 	gl_state.blendfunc2 = GL_ZERO;
 	gl_state.blend = false;
@@ -624,6 +626,22 @@ void GL_DepthTest(int state)
 	}
 }
 
+void GL_AlphaTest(int state)
+{
+	if (gl_state.alphatest != state)
+	{
+		gl_state.alphatest = state;
+		if (gl_state.alphatest)
+		{
+			qglEnable(GL_ALPHA_TEST);CHECKGLERROR
+		}
+		else
+		{
+			qglDisable(GL_ALPHA_TEST);CHECKGLERROR
+		}
+	}
+}
+
 void GL_ColorMask(int r, int g, int b, int a)
 {
 	int state = r*8 + g*4 + b*2 + a*1;
diff --git a/gl_backend.h b/gl_backend.h
index c7fba5ec..9a9be676 100644
--- a/gl_backend.h
+++ b/gl_backend.h
@@ -17,6 +17,7 @@ void GL_SetupView_Mode_Ortho(double x1, double y1, double x2, double y2, double
 void GL_BlendFunc(int blendfunc1, int blendfunc2);
 void GL_DepthMask(int state);
 void GL_DepthTest(int state);
+void GL_AlphaTest(int state);
 void GL_ColorMask(int r, int g, int b, int a);
 void GL_Color(float cr, float cg, float cb, float ca);
 void GL_TransformToScreen(const vec4_t in, vec4_t out);
-- 
2.39.2