i965: Add various plumbing for cubemap arrays

V4: Fixed style nits

Signed-off-by: Chris Forbes <chrisf@ijw.co.nz>
Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

src/mesa/drivers/dri/i965/brw_tex_layout.c

 brw_miptree_layout(struct intel_context *intel, struct intel_mipmap_tree *mt)
 {
    switch (mt->target) {
+   case GL_TEXTURE_CUBE_MAP_ARRAY:
+      brw_miptree_layout_texture_array(intel, mt);
+      break;
+
    case GL_TEXTURE_CUBE_MAP:
       if (intel->gen >= 5) {
 	 /* On Ironlake, cube maps are finally represented as just a series of

src/mesa/drivers/dri/i965/brw_wm_sampler_state.c

    /* Cube-maps on 965 and later must use the same wrap mode for all 3
     * coordinate dimensions.  Futher, only CUBE and CLAMP are valid.
     */
-   if (texObj->Target == GL_TEXTURE_CUBE_MAP) {
+   if (texObj->Target == GL_TEXTURE_CUBE_MAP ||
+       texObj->Target == GL_TEXTURE_CUBE_MAP_ARRAY) {
       if (ctx->Texture.CubeMapSeamless &&
 	  (gl_sampler->MinFilter != GL_NEAREST ||
 	   gl_sampler->MagFilter != GL_NEAREST)) {

src/mesa/drivers/dri/i965/brw_wm_surface_state.c

       return BRW_SURFACE_3D;
 
    case GL_TEXTURE_CUBE_MAP: 
+   case GL_TEXTURE_CUBE_MAP_ARRAY:
       return BRW_SURFACE_CUBE;
 
    default: 

src/mesa/drivers/dri/i965/gen7_sampler_state.c

    /* Cube-maps on 965 and later must use the same wrap mode for all 3
     * coordinate dimensions.  Futher, only CUBE and CLAMP are valid.
     */
-   if (texObj->Target == GL_TEXTURE_CUBE_MAP) {
+   if (texObj->Target == GL_TEXTURE_CUBE_MAP ||
+       texObj->Target == GL_TEXTURE_CUBE_MAP_ARRAY) {
       if (ctx->Texture.CubeMapSeamless &&
 	  (gl_sampler->MinFilter != GL_NEAREST ||
 	   gl_sampler->MagFilter != GL_NEAREST)) {

src/mesa/drivers/dri/i965/gen7_wm_surface_state.c

                                                    firstImage->InternalFormat,
                                                    tObj->DepthMode,
                                                    sampler->sRGBDecode);
-   if (tObj->Target == GL_TEXTURE_CUBE_MAP) {
+   if (tObj->Target == GL_TEXTURE_CUBE_MAP ||
+       tObj->Target == GL_TEXTURE_CUBE_MAP_ARRAY) {
       surf->ss0.cube_pos_x = 1;
       surf->ss0.cube_pos_y = 1;
       surf->ss0.cube_pos_z = 1;