i965/blorp: Enable blits on gen8

v2 (Ken): Moved switch cases for gen8/9 in texel_fetch() to
          earlier patch adding gen8/9 sampling support.

Signed-off-by: Topi Pohjolainen <topi.pohjolainen@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

src/mesa/drivers/dri/i965/brw_blorp.cpp

@@ -210,7 +210,7 @@ void
 brw_blorp_exec(struct brw_context *brw, const brw_blorp_params *params)
 {
    struct gl_context *ctx = &brw->ctx;
-   uint32_t estimated_max_batch_usage = 1500;
+   const uint32_t estimated_max_batch_usage = brw->gen >= 8 ? 1800 : 1500;
    bool check_aperture_failed_once = false;
 
    /* Flush the sampler and render caches.  We definitely need to flush the
@@ -236,6 +236,10 @@ retry:
    case 7:
       gen7_blorp_exec(brw, params);
       break;
+   case 8:
+   case 9:
+      gen8_blorp_exec(brw, params);
+      break;
    default:
       /* BLORP is not supported before Gen6. */
       unreachable("not reached");

src/mesa/drivers/dri/i965/brw_blorp_blit.cpp

@@ -256,8 +256,8 @@ brw_blorp_copytexsubimage(struct brw_context *brw,
        src_mt->num_samples > 8 || dst_mt->num_samples > 8)
       return false;
 
-   /* BLORP is only supported for Gen6-7. */
-   if (brw->gen < 6 || brw->gen > 7)
+   /* BLORP is only supported from Gen6 onwards. */
+   if (brw->gen < 6)
       return false;
 
    if (_mesa_get_format_base_format(src_rb->Format) !=
@@ -359,7 +359,7 @@ brw_blorp_framebuffer(struct brw_context *brw,
                       GLbitfield mask, GLenum filter)
 {
    /* BLORP is not supported before Gen6. */
-   if (brw->gen < 6 || brw->gen >= 8)
+   if (brw->gen < 6)
       return mask;
 
    /* There is support only for four and eight samples. */

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

@@ -2165,8 +2165,7 @@ intel_miptree_updownsample(struct brw_context *brw,
                            struct intel_mipmap_tree *dst)
 {
    /* There is support only for four and eight samples. */
-   const bool use_blorp = brw->gen < 8 &&
-                          src->num_samples != 2 && dst->num_samples != 2 &&
+   const bool use_blorp = src->num_samples != 2 && dst->num_samples != 2 &&
                           src->num_samples <= 8 && dst->num_samples <= 8;
 
    if (use_blorp) {