i965: Move the back-end compiler to src/intel/compiler

Mostly a dummy git mv with a couple of noticable parts:
 - With the earlier header cleanups, nothing in src/intel depends
files from src/mesa/drivers/dri/i965/
 - Both Autoconf and Android builds are addressed. Thanks to Mauro and
Tapani for the fixups in the latter
 - brw_util.[ch] is not really compiler specific, so it's moved to i965.

v2:
 - move brw_eu_defines.h instead of brw_defines.h
 - remove no-longer applicable includes
 - add missing vulkan/ prefix in the Android build (thanks Tapani)

v3:
 - don't list brw_defines.h in src/intel/Makefile.sources (Jason)
 - rebase on top of the oa patches

[Emil Velikov: commit message, various small fixes througout]
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>

src/intel/compiler/brw_interpolation_map.c

@@ -0,0 +1,109 @@
+/*
+ * Copyright © 2013 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include "brw_compiler.h"
+#include "compiler/nir/nir.h"
+
+static char const *get_qual_name(int mode)
+{
+   switch (mode) {
+      case INTERP_MODE_NONE:          return "none";
+      case INTERP_MODE_FLAT:          return "flat";
+      case INTERP_MODE_SMOOTH:        return "smooth";
+      case INTERP_MODE_NOPERSPECTIVE: return "nopersp";
+      default:                             return "???";
+   }
+}
+
+static void
+gen4_frag_prog_set_interp_modes(struct brw_wm_prog_data *prog_data,
+                                struct brw_vue_map *vue_map,
+                                unsigned location, unsigned slot_count,
+                                enum glsl_interp_mode interp)
+{
+   for (unsigned k = 0; k < slot_count; k++) {
+      unsigned slot = vue_map->varying_to_slot[location + k];
+      if (slot != -1 && prog_data->interp_mode[slot] == INTERP_MODE_NONE) {
+         prog_data->interp_mode[slot] = interp;
+
+         if (prog_data->interp_mode[slot] == INTERP_MODE_FLAT) {
+            prog_data->contains_flat_varying = true;
+         } else if (prog_data->interp_mode[slot] == INTERP_MODE_NOPERSPECTIVE) {
+            prog_data->contains_noperspective_varying = true;
+         }
+      }
+   }
+}
+
+/* Set up interpolation modes for every element in the VUE */
+void
+brw_setup_vue_interpolation(struct brw_vue_map *vue_map, nir_shader *nir,
+                            struct brw_wm_prog_data *prog_data,
+                            const struct gen_device_info *devinfo)
+{
+   /* Initialise interp_mode. INTERP_MODE_NONE == 0 */
+   memset(prog_data->interp_mode, 0, sizeof(prog_data->interp_mode));
+
+   if (!vue_map)
+      return;
+
+   /* HPOS always wants noperspective. setting it up here allows
+    * us to not need special handling in the SF program.
+    */
+   unsigned pos_slot = vue_map->varying_to_slot[VARYING_SLOT_POS];
+   if (pos_slot != -1) {;
+      prog_data->interp_mode[pos_slot] = INTERP_MODE_NOPERSPECTIVE;
+      prog_data->contains_noperspective_varying = true;
+   }
+
+   foreach_list_typed(nir_variable, var, node, &nir->inputs) {
+      unsigned location = var->data.location;
+      unsigned slot_count = glsl_count_attribute_slots(var->type, false);
+
+      gen4_frag_prog_set_interp_modes(prog_data, vue_map, location, slot_count,
+                                      var->data.interpolation);
+
+      if (location == VARYING_SLOT_COL0 || location == VARYING_SLOT_COL1) {
+         location = location + VARYING_SLOT_BFC0 - VARYING_SLOT_COL0;
+         gen4_frag_prog_set_interp_modes(prog_data, vue_map, location,
+                                         slot_count, var->data.interpolation);
+      }
+   }
+
+   bool debug = false;
+   if (debug) {
+      fprintf(stderr, "VUE map:\n");
+      for (int i = 0; i < vue_map->num_slots; i++) {
+         int varying = vue_map->slot_to_varying[i];
+         if (varying == -1) {
+            fprintf(stderr, "%d: --\n", i);
+            continue;
+         }
+
+         fprintf(stderr, "%d: %d %s ofs %d\n",
+                 i, varying,
+                 get_qual_name(prog_data->interp_mode[i]),
+                 brw_vue_slot_to_offset(i));
+      }
+   }
+}