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

diff --git a/gl_backend.c b/gl_backend.c
index a3b6747dcca4a22a5e5b2abe77370e3b82401a4f..ca2b7104e976313f12c82d35623fb61edcafbbc8 100644 (file)
--- 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 c7fba5ec1d5ffbc2156275e2df6769b5f624d5b8..9a9be6762787b40249358d7965d0e8a5c4739d7c 100644 (file)
--- 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);