use subtractive blend equation to support negative v_brightness; support smaller...

[xonotic/darkplaces.git] / gl_backend.h

diff --git a/gl_backend.h b/gl_backend.h
index 44418d971d5ce31de0c1af1689c872a845ebff1e..0a35233621018c4c26ccc3381f40e34d4a8d0c41 100644 (file)
--- a/gl_backend.h
+++ b/gl_backend.h
@@ -31,6 +31,7 @@ void R_GetViewport(r_viewport_t *v);
 void GL_Finish(void);
 
 void GL_BlendFunc(int blendfunc1, int blendfunc2);
+void GL_BlendEquationSubtract(qboolean negated);
 void GL_DepthMask(int state);
 void GL_DepthTest(int state);
 void GL_DepthFunc(int state);