wined3d: Enable SM3 if ARB_shader_texture_lod is supported.

dlls/wined3d/glsl_shader.c

@@ -4933,9 +4933,16 @@ static void shader_glsl_get_caps(const struct wined3d_gl_info *gl_info, struct s
      * goes up to 512. Assume that if the number of instructions is 512 or
      * less we have to do with SM2 hardware. NOTE: SM3 requires 512 or more
      * instructions but ATI and NVIDIA offer more than that (1024 vs 4096) on
-     * their most basic SM3 hardware. */
+     * their most basic SM3 hardware.
+     *
+     * ARB_shader_texture_lod is a requirement for SM3 (texldd). Ideally we'd
+     * make this a hard requirement, but the extension is still somewhat new,
+     * and relatively few SM3 shaders actually depend on it. For the moment
+     * just use it to enable SM3 (20110423). */
     if ((gl_info->supported[NV_VERTEX_PROGRAM3] && gl_info->supported[NV_FRAGMENT_PROGRAM2])
-            || gl_info->limits.arb_ps_instructions > 512)
+            || gl_info->limits.arb_ps_instructions > 512
+            || gl_info->supported[ARB_SHADER_TEXTURE_LOD]
+            || gl_info->supported[EXT_GPU_SHADER4])
     {
         pCaps->VertexShaderVersion = WINED3DVS_VERSION(3,0);
         pCaps->PixelShaderVersion = WINED3DPS_VERSION(3,0);