1 files changed, 102 insertions, 0 deletions
diff --git a/src/intel/blorp/blorp_nir_builder.h b/src/intel/blorp/blorp_nir_builder.h
new file mode 100644
index 00000000000..7f23abdef4d
--- /dev/null
+++ b/src/intel/blorp/blorp_nir_builder.h
@@ -0,0 +1,102 @@
+/*
+ * Copyright © 2017 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 "compiler/nir/nir_builder.h"
+
+static inline nir_ssa_def *
+blorp_nir_frag_coord(nir_builder *b)
+{
+   nir_variable *frag_coord =
+      nir_variable_create(b->shader, nir_var_shader_in,
+                          glsl_vec4_type(), "gl_FragCoord");
+
+   frag_coord->data.location = VARYING_SLOT_POS;
+   frag_coord->data.origin_upper_left = true;
+
+   return nir_load_var(b, frag_coord);
+}
+
+static inline nir_ssa_def *
+blorp_nir_txf_ms_mcs(nir_builder *b, nir_ssa_def *xy_pos, nir_ssa_def *layer)
+{
+   nir_tex_instr *tex = nir_tex_instr_create(b->shader, 1);
+   tex->op = nir_texop_txf_ms_mcs;
+   tex->sampler_dim = GLSL_SAMPLER_DIM_MS;
+   tex->dest_type = nir_type_int;
+
+   nir_ssa_def *coord;
+   if (layer) {
+      tex->is_array = true;
+      tex->coord_components = 3;
+      coord = nir_vec3(b, nir_channel(b, xy_pos, 0),
+                          nir_channel(b, xy_pos, 1),
+                          layer);
+   } else {
+      tex->is_array = false;
+      tex->coord_components = 2;
+      coord = nir_channels(b, xy_pos, 0x3);
+   }
+   tex->src[0].src_type = nir_tex_src_coord;
+   tex->src[0].src = nir_src_for_ssa(coord);
+
+   /* Blorp only has one texture and it's bound at unit 0 */
+   tex->texture_index = 0;
+   tex->sampler_index = 0;
+
+   nir_ssa_dest_init(&tex->instr, &tex->dest, 4, 32, NULL);
+   nir_builder_instr_insert(b, &tex->instr);
+
+   return &tex->dest.ssa;
+}
+
+static inline nir_ssa_def *
+blorp_nir_mcs_is_clear_color(nir_builder *b,
+                             nir_ssa_def *mcs,
+                             uint32_t samples)
+{
+   switch (samples) {
+   case 2:
+      /* Empirical evidence suggests that the value returned from the
+       * sampler is not always 0x3 for clear color so we need to mask it.
+       */
+      return nir_ieq(b, nir_iand(b, nir_channel(b, mcs, 0),
+                                    nir_imm_int(b, 0x3)),
+                    nir_imm_int(b, 0x3));
+
+   case 4:
+      return nir_ieq(b, nir_channel(b, mcs, 0), nir_imm_int(b, 0xff));
+
+   case 8:
+      return nir_ieq(b, nir_channel(b, mcs, 0), nir_imm_int(b, ~0));
+
+   case 16:
+      /* For 16x MSAA, the MCS is actually an ivec2 */
+      return nir_iand(b, nir_ieq(b, nir_channel(b, mcs, 0),
+                                    nir_imm_int(b, ~0)),
+                         nir_ieq(b, nir_channel(b, mcs, 1),
+                                    nir_imm_int(b, ~0)));
+
+   default:
+      unreachable("Invalid sample count");
+   }
+}