wined3d: Use GL_EXT_texture_mirror_clamp when available.

dlls/wined3d/directx.c

@@ -179,6 +179,7 @@ static const struct wined3d_extension_map gl_extension_map[] =
     {"GL_EXT_texture_env_dot3",             EXT_TEXTURE_ENV_DOT3          },
     {"GL_EXT_texture_filter_anisotropic",   EXT_TEXTURE_FILTER_ANISOTROPIC},
     {"GL_EXT_texture_lod_bias",             EXT_TEXTURE_LOD_BIAS          },
+    {"GL_EXT_texture_mirror_clamp",         EXT_TEXTURE_MIRROR_CLAMP      },
     {"GL_EXT_texture_sRGB",                 EXT_TEXTURE_SRGB              },
     {"GL_EXT_texture_sRGB_decode",          EXT_TEXTURE_SRGB_DECODE       },
     {"GL_EXT_vertex_array_bgra",            EXT_VERTEX_ARRAY_BGRA         },
@@ -2933,6 +2934,11 @@ static BOOL wined3d_adapter_init_gl_caps(struct wined3d_adapter *adapter)
         if (!counter_bits)
             gl_info->supported[ARB_OCCLUSION_QUERY] = FALSE;
     }
+    if (!gl_info->supported[ATI_TEXTURE_MIRROR_ONCE] && gl_info->supported[EXT_TEXTURE_MIRROR_CLAMP])
+    {
+        TRACE(" IMPLIED: ATI_texture_mirror_once support (by EXT_texture_mirror_clamp).\n");
+        gl_info->supported[ATI_TEXTURE_MIRROR_ONCE] = TRUE;
+    }
     if (!gl_info->supported[ARB_TEXTURE_MIRROR_CLAMP_TO_EDGE] && gl_info->supported[ATI_TEXTURE_MIRROR_ONCE])
     {
         TRACE(" IMPLIED: ARB_texture_mirror_clamp_to_edge support (by ATI_texture_mirror_once).\n");

dlls/wined3d/wined3d_gl.h

@@ -127,6 +127,7 @@ enum wined3d_gl_extension
     EXT_TEXTURE_ENV_DOT3,
     EXT_TEXTURE_FILTER_ANISOTROPIC,
     EXT_TEXTURE_LOD_BIAS,
+    EXT_TEXTURE_MIRROR_CLAMP,
     EXT_TEXTURE_SRGB,
     EXT_TEXTURE_SRGB_DECODE,
     EXT_VERTEX_ARRAY_BGRA,