better support non-GLSL130 in offsetmapping

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@10918 d7cf8633-e32d-0410-b094-e92efae38249

diff --git a/shader_glsl.h b/shader_glsl.h
index 20be4e6e630c77fdd84e5f917a09966c9c068e82..7adabc437b64dfb9945851afb9b2403ff193a98b 100644 (file)
--- a/shader_glsl.h
+++ b/shader_glsl.h
@@ -24,6 +24,10 @@
 "# define texture2D texture\n"
 "# define texture3D texture\n"
 "# define textureCube texture\n"
+"#else\n"
+"# define textureGrad(a,b,c,d) texture2D(a,b)\n"
+"# define dFdx(a) 0\n"
+"# define dFdy(a) 0\n"
 "#endif\n"
 "\n"
 "#ifdef VERTEX_SHADER\n"