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 <[email protected]>
Reviewed-by: Jason Ekstrand <[email protected]>

1 files changed, 221 insertions, 0 deletions

diff --git a/src/intel/compiler/brw_vec4_vs_visitor.cpp b/src/intel/compiler/brw_vec4_vs_visitor.cpp
new file mode 100644
index 00000000000..0cec77990d6
--- /dev/null
+++ b/src/intel/compiler/brw_vec4_vs_visitor.cpp
@@ -0,0 +1,221 @@
+/*
+ * 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_vec4_vs.h"
+#include "common/gen_debug.h"
+
+namespace brw {
+
+void
+vec4_vs_visitor::emit_prolog()
+{
+}
+
+
+dst_reg *
+vec4_vs_visitor::make_reg_for_system_value(int location)
+{
+   /* VertexID is stored by the VF as the last vertex element, but
+    * we don't represent it with a flag in inputs_read, so we call
+    * it VERT_ATTRIB_MAX, which setup_attributes() picks up on.
+    */
+   dst_reg *reg = new(mem_ctx) dst_reg(ATTR, VERT_ATTRIB_MAX);
+
+   switch (location) {
+   case SYSTEM_VALUE_BASE_VERTEX:
+      reg->writemask = WRITEMASK_X;
+      vs_prog_data->uses_basevertex = true;
+      break;
+   case SYSTEM_VALUE_BASE_INSTANCE:
+      reg->writemask = WRITEMASK_Y;
+      vs_prog_data->uses_baseinstance = true;
+      break;
+   case SYSTEM_VALUE_VERTEX_ID:
+   case SYSTEM_VALUE_VERTEX_ID_ZERO_BASE:
+      reg->writemask = WRITEMASK_Z;
+      vs_prog_data->uses_vertexid = true;
+      break;
+   case SYSTEM_VALUE_INSTANCE_ID:
+      reg->writemask = WRITEMASK_W;
+      vs_prog_data->uses_instanceid = true;
+      break;
+   case SYSTEM_VALUE_DRAW_ID:
+      reg = new(mem_ctx) dst_reg(ATTR, VERT_ATTRIB_MAX + 1);
+      reg->writemask = WRITEMASK_X;
+      vs_prog_data->uses_drawid = true;
+      break;
+   default:
+      unreachable("not reached");
+   }
+
+   return reg;
+}
+
+
+void
+vec4_vs_visitor::emit_urb_write_header(int mrf)
+{
+   /* No need to do anything for VS; an implied write to this MRF will be
+    * performed by VS_OPCODE_URB_WRITE.
+    */
+   (void) mrf;
+}
+
+
+vec4_instruction *
+vec4_vs_visitor::emit_urb_write_opcode(bool complete)
+{
+   /* For VS, the URB writes end the thread. */
+   if (complete) {
+      if (INTEL_DEBUG & DEBUG_SHADER_TIME)
+         emit_shader_time_end();
+   }
+
+   vec4_instruction *inst = emit(VS_OPCODE_URB_WRITE);
+   inst->urb_write_flags = complete ?
+      BRW_URB_WRITE_EOT_COMPLETE : BRW_URB_WRITE_NO_FLAGS;
+
+   return inst;
+}
+
+
+void
+vec4_vs_visitor::emit_urb_slot(dst_reg reg, int varying)
+{
+   reg.type = BRW_REGISTER_TYPE_F;
+   output_reg[varying][0].type = reg.type;
+
+   switch (varying) {
+   case VARYING_SLOT_COL0:
+   case VARYING_SLOT_COL1:
+   case VARYING_SLOT_BFC0:
+   case VARYING_SLOT_BFC1: {
+      /* These built-in varyings are only supported in compatibility mode,
+       * and we only support GS in core profile.  So, this must be a vertex
+       * shader.
+       */
+      vec4_instruction *inst = emit_generic_urb_slot(reg, varying, 0);
+      if (inst && key->clamp_vertex_color)
+         inst->saturate = true;
+      break;
+   }
+   default:
+      return vec4_visitor::emit_urb_slot(reg, varying);
+   }
+}
+
+
+void
+vec4_vs_visitor::emit_clip_distances(dst_reg reg, int offset)
+{
+   /* From the GLSL 1.30 spec, section 7.1 (Vertex Shader Special Variables):
+    *
+    *     "If a linked set of shaders forming the vertex stage contains no
+    *     static write to gl_ClipVertex or gl_ClipDistance, but the
+    *     application has requested clipping against user clip planes through
+    *     the API, then the coordinate written to gl_Position is used for
+    *     comparison against the user clip planes."
+    *
+    * This function is only called if the shader didn't write to
+    * gl_ClipDistance.  Accordingly, we use gl_ClipVertex to perform clipping
+    * if the user wrote to it; otherwise we use gl_Position.
+    */
+   gl_varying_slot clip_vertex = VARYING_SLOT_CLIP_VERTEX;
+   if (!(prog_data->vue_map.slots_valid & VARYING_BIT_CLIP_VERTEX)) {
+      clip_vertex = VARYING_SLOT_POS;
+   }
+
+   for (int i = 0; i + offset < key->nr_userclip_plane_consts && i < 4;
+        ++i) {
+      reg.writemask = 1 << i;
+      emit(DP4(reg,
+               src_reg(output_reg[clip_vertex][0]),
+               src_reg(this->userplane[i + offset])));
+   }
+}
+
+
+void
+vec4_vs_visitor::setup_uniform_clipplane_values()
+{
+   for (int i = 0; i < key->nr_userclip_plane_consts; ++i) {
+      this->userplane[i] = dst_reg(UNIFORM, this->uniforms);
+      this->userplane[i].type = BRW_REGISTER_TYPE_F;
+      for (int j = 0; j < 4; ++j) {
+         stage_prog_data->param[this->uniforms * 4 + j] =
+            (gl_constant_value *) &clip_planes[i][j];
+      }
+      ++this->uniforms;
+   }
+}
+
+
+void
+vec4_vs_visitor::emit_thread_end()
+{
+   setup_uniform_clipplane_values();
+
+   /* Lower legacy ff and ClipVertex clipping to clip distances */
+   if (key->nr_userclip_plane_consts > 0) {
+      current_annotation = "user clip distances";
+
+      output_reg[VARYING_SLOT_CLIP_DIST0][0] =
+         dst_reg(this, glsl_type::vec4_type);
+      output_reg[VARYING_SLOT_CLIP_DIST1][0] =
+         dst_reg(this, glsl_type::vec4_type);
+      output_num_components[VARYING_SLOT_CLIP_DIST0][0] = 4;
+      output_num_components[VARYING_SLOT_CLIP_DIST1][0] = 4;
+
+      emit_clip_distances(output_reg[VARYING_SLOT_CLIP_DIST0][0], 0);
+      emit_clip_distances(output_reg[VARYING_SLOT_CLIP_DIST1][0], 4);
+   }
+
+   /* For VS, we always end the thread by emitting a single vertex.
+    * emit_urb_write_opcode() will take care of setting the eot flag on the
+    * SEND instruction.
+    */
+   emit_vertex();
+}
+
+
+vec4_vs_visitor::vec4_vs_visitor(const struct brw_compiler *compiler,
+                                 void *log_data,
+                                 const struct brw_vs_prog_key *key,
+                                 struct brw_vs_prog_data *vs_prog_data,
+                                 const nir_shader *shader,
+                                 gl_clip_plane *clip_planes,
+                                 void *mem_ctx,
+                                 int shader_time_index,
+                                 bool use_legacy_snorm_formula)
+   : vec4_visitor(compiler, log_data, &key->tex, &vs_prog_data->base, shader,
+                  mem_ctx, false /* no_spills */, shader_time_index),
+     key(key),
+     vs_prog_data(vs_prog_data),
+     clip_planes(clip_planes),
+     use_legacy_snorm_formula(use_legacy_snorm_formula)
+{
+}
+
+
+} /* namespace brw */