Work around Nvidia driver bug

https://www.khronos.org/registry/OpenGL/specs/gl/GLSLangSpec.1.20.pdf
Section 4.1.3 says that hexadecimal integer literals are supported, but
Nvidia have never read a specification since their founding, so their
engineers didn't know that hexadecimal integer literals are requires to
be supported to advertise support OpenGL versions with GLSL support.

files/shaders/alpha.glsl

@@ -1,12 +1,12 @@
 
-#define FUNC_NEVER                          0x0200
-#define FUNC_LESS                           0x0201
-#define FUNC_EQUAL                          0x0202
-#define FUNC_LEQUAL                         0x0203
-#define FUNC_GREATER                        0x0204
-#define FUNC_NOTEQUAL                       0x0205
-#define FUNC_GEQUAL                         0x0206
-#define FUNC_ALWAYS                         0x0207
+#define FUNC_NEVER                          512 // 0x0200
+#define FUNC_LESS                           513 // 0x0201
+#define FUNC_EQUAL                          514 // 0x0202
+#define FUNC_LEQUAL                         515 // 0x0203
+#define FUNC_GREATER                        516 // 0x0204
+#define FUNC_NOTEQUAL                       517 // 0x0205
+#define FUNC_GEQUAL                         518 // 0x0206
+#define FUNC_ALWAYS                         519 // 0x0207
 
 #if @alphaFunc != FUNC_ALWAYS && @alphaFunc != FUNC_NEVER
 uniform float alphaRef;