gallivm: nir->tgsi info convertor (v2)

This is a port of the old radeonsi code to be used for llvmpipe NIR support.

Once we remove TGSI support from llvmpipe (I can dream? :-), then
we should be able to refine most of this down and remove it.

v2: port to later radeonsi code for vertex inputs and sampler/io parsing.

Acked-by: Roland Scheidegger <[email protected]>

5 files changed, 816 insertions, 1 deletions

diff --git a/src/gallium/auxiliary/Makefile.sources b/src/gallium/auxiliary/Makefile.sources
index 213bfe93f9b..567cb00d7ee 100644
--- a/src/gallium/auxiliary/Makefile.sources
+++ b/src/gallium/auxiliary/Makefile.sources
@@ -317,7 +317,9 @@ C_SOURCES := \
 
 NIR_SOURCES := \
 	nir/tgsi_to_nir.c \
-	nir/tgsi_to_nir.h
+	nir/tgsi_to_nir.h \
+	nir/nir_to_tgsi_info.c \
+	nir/nir_to_tgsi_info.h
 
 VL_SOURCES := \
 	vl/vl_bicubic_filter.c \
diff --git a/src/gallium/auxiliary/SConscript b/src/gallium/auxiliary/SConscript
index 56134da03ee..cba4e3f7a71 100644
--- a/src/gallium/auxiliary/SConscript
+++ b/src/gallium/auxiliary/SConscript
@@ -6,6 +6,8 @@ env.Append(CPPPATH = [
     '#src',
     'indices',
     'util',
+    '#src/compiler/nir',
+    '../../compiler/nir',
 ])
 
 env = env.Clone()
@@ -34,6 +36,7 @@ source = env.ParseSourceList('Makefile.sources', [
 
 if env['llvm']:
     source += env.ParseSourceList('Makefile.sources', [
+        'NIR_SOURCES',
         'GALLIVM_SOURCES',
     ])
 
diff --git a/src/gallium/auxiliary/meson.build b/src/gallium/auxiliary/meson.build
index 27cd8207e14..aaf5138a169 100644
--- a/src/gallium/auxiliary/meson.build
+++ b/src/gallium/auxiliary/meson.build
@@ -417,6 +417,8 @@ if with_llvm
     'draw/draw_llvm_sample.c',
     'draw/draw_pt_fetch_shade_pipeline_llvm.c',
     'draw/draw_vs_llvm.c',
+    'nir/nir_to_tgsi_info.c',
+    'nir/nir_to_tgsi_info.h',
   )
 endif
 
diff --git a/src/gallium/auxiliary/nir/nir_to_tgsi_info.c b/src/gallium/auxiliary/nir/nir_to_tgsi_info.c
new file mode 100644
index 00000000000..a761f4460c6
--- /dev/null
+++ b/src/gallium/auxiliary/nir/nir_to_tgsi_info.c
@@ -0,0 +1,766 @@
+/*
+ * Copyright 2017 Advanced Micro Devices, Inc.
+ * All Rights Reserved.
+ *
+ * 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
+ * on the rights to use, copy, modify, merge, publish, distribute, sub
+ * license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHOR(S) AND/OR THEIR SUPPLIERS 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.
+ */
+
+/*
+ * This is ported mostly out of radeonsi, if we can drop TGSI, we can likely
+ * make a lot this go away.
+ */
+
+#include "nir_to_tgsi_info.h"
+#include "util/u_math.h"
+#include "nir.h"
+#include "nir_deref.h"
+#include "tgsi/tgsi_scan.h"
+#include "tgsi/tgsi_from_mesa.h"
+
+static nir_variable* tex_get_texture_var(nir_tex_instr *instr)
+{
+   for (unsigned i = 0; i < instr->num_srcs; i++) {
+      switch (instr->src[i].src_type) {
+      case nir_tex_src_texture_deref:
+         return nir_deref_instr_get_variable(nir_src_as_deref(instr->src[i].src));
+      default:
+         break;
+      }
+   }
+
+   return NULL;
+}
+
+static nir_variable* intrinsic_get_var(nir_intrinsic_instr *instr)
+{
+   return nir_deref_instr_get_variable(nir_src_as_deref(instr->src[0]));
+}
+
+
+static void gather_usage_helper(const nir_deref_instr **deref_ptr,
+				unsigned location,
+				uint8_t mask,
+				uint8_t *usage_mask)
+{
+	for (; *deref_ptr; deref_ptr++) {
+		const nir_deref_instr *deref = *deref_ptr;
+		switch (deref->deref_type) {
+		case nir_deref_type_array: {
+			unsigned elem_size =
+				glsl_count_attribute_slots(deref->type, false);
+			if (nir_src_is_const(deref->arr.index)) {
+				location += elem_size * nir_src_as_uint(deref->arr.index);
+			} else {
+				unsigned array_elems =
+					glsl_get_length(deref_ptr[-1]->type);
+				for (unsigned i = 0; i < array_elems; i++) {
+					gather_usage_helper(deref_ptr + 1,
+							    location + elem_size * i,
+							    mask, usage_mask);
+				}
+				return;
+			}
+			break;
+		}
+		case nir_deref_type_struct: {
+			const struct glsl_type *parent_type =
+				deref_ptr[-1]->type;
+			unsigned index = deref->strct.index;
+			for (unsigned i = 0; i < index; i++) {
+				const struct glsl_type *ft = glsl_get_struct_field(parent_type, i);
+				location += glsl_count_attribute_slots(ft, false);
+			}
+			break;
+		}
+		default:
+			unreachable("Unhandled deref type in gather_components_used_helper");
+		}
+	}
+
+	usage_mask[location] |= mask & 0xf;
+	if (mask & 0xf0)
+		usage_mask[location + 1] |= (mask >> 4) & 0xf;
+}
+
+static void gather_usage(const nir_deref_instr *deref,
+			 uint8_t mask,
+			 uint8_t *usage_mask)
+{
+	nir_deref_path path;
+	nir_deref_path_init(&path, (nir_deref_instr *)deref, NULL);
+
+	unsigned location_frac = path.path[0]->var->data.location_frac;
+	if (glsl_type_is_64bit(deref->type)) {
+		uint8_t new_mask = 0;
+		for (unsigned i = 0; i < 4; i++) {
+			if (mask & (1 << i))
+				new_mask |= 0x3 << (2 * i);
+		}
+		mask = new_mask << location_frac;
+	} else {
+		mask <<= location_frac;
+		mask &= 0xf;
+	}
+
+	gather_usage_helper((const nir_deref_instr **)&path.path[1],
+			    path.path[0]->var->data.driver_location,
+			    mask, usage_mask);
+
+	nir_deref_path_finish(&path);
+}
+
+static void gather_intrinsic_load_deref_info(const nir_shader *nir,
+                                             const nir_intrinsic_instr *instr,
+					     const nir_deref_instr *deref,
+                                             bool need_texcoord,
+                                             nir_variable *var,
+                                             struct tgsi_shader_info *info)
+{
+   assert(var && var->data.mode == nir_var_shader_in);
+
+   gather_usage(deref, nir_ssa_def_components_read(&instr->dest.ssa),
+		info->input_usage_mask);
+   switch (nir->info.stage) {
+   case MESA_SHADER_VERTEX: {
+      break;
+   }
+   default: {
+      unsigned semantic_name, semantic_index;
+      tgsi_get_gl_varying_semantic(var->data.location, need_texcoord,
+                                   &semantic_name, &semantic_index);
+
+      if (semantic_name == TGSI_SEMANTIC_COLOR) {
+         uint8_t mask = nir_ssa_def_components_read(&instr->dest.ssa);
+         info->colors_read |= mask << (semantic_index * 4);
+      }
+      if (semantic_name == TGSI_SEMANTIC_FACE) {
+         info->uses_frontface = true;
+      }
+      break;
+   }
+   }
+}
+
+static void scan_instruction(const struct nir_shader *nir,
+                             bool need_texcoord,
+                             struct tgsi_shader_info *info,
+                             nir_instr *instr)
+{
+   if (instr->type == nir_instr_type_alu) {
+      nir_alu_instr *alu = nir_instr_as_alu(instr);
+
+      switch (alu->op) {
+      case nir_op_fddx:
+      case nir_op_fddy:
+      case nir_op_fddx_fine:
+      case nir_op_fddy_fine:
+      case nir_op_fddx_coarse:
+      case nir_op_fddy_coarse:
+         info->uses_derivatives = true;
+         break;
+      default:
+         break;
+      }
+   } else if (instr->type == nir_instr_type_tex) {
+      nir_tex_instr *tex = nir_instr_as_tex(instr);
+      nir_variable *texture = tex_get_texture_var(tex);
+
+      if (!texture) {
+         info->samplers_declared |=
+            u_bit_consecutive(tex->sampler_index, 1);
+      } else {
+         if (texture->data.bindless)
+            info->uses_bindless_samplers = true;
+      }
+
+      switch (tex->op) {
+      case nir_texop_tex:
+      case nir_texop_txb:
+      case nir_texop_lod:
+         info->uses_derivatives = true;
+         break;
+      default:
+         break;
+      }
+   } else if (instr->type == nir_instr_type_intrinsic) {
+      nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
+
+      switch (intr->intrinsic) {
+      case nir_intrinsic_load_front_face:
+         info->uses_frontface = 1;
+         break;
+      case nir_intrinsic_load_instance_id:
+         info->uses_instanceid = 1;
+         break;
+      case nir_intrinsic_load_invocation_id:
+         info->uses_invocationid = true;
+         break;
+      case nir_intrinsic_load_num_work_groups:
+         info->uses_grid_size = true;
+         break;
+      case nir_intrinsic_load_local_group_size:
+         /* The block size is translated to IMM with a fixed block size. */
+         if (info->properties[TGSI_PROPERTY_CS_FIXED_BLOCK_WIDTH] == 0)
+            info->uses_block_size = true;
+         break;
+      case nir_intrinsic_load_local_invocation_id:
+      case nir_intrinsic_load_work_group_id: {
+         unsigned mask = nir_ssa_def_components_read(&intr->dest.ssa);
+         while (mask) {
+            unsigned i = u_bit_scan(&mask);
+
+            if (intr->intrinsic == nir_intrinsic_load_work_group_id)
+               info->uses_block_id[i] = true;
+            else
+               info->uses_thread_id[i] = true;
+         }
+         break;
+      }
+      case nir_intrinsic_load_vertex_id:
+         info->uses_vertexid = 1;
+         break;
+      case nir_intrinsic_load_vertex_id_zero_base:
+         info->uses_vertexid_nobase = 1;
+         break;
+      case nir_intrinsic_load_base_vertex:
+         info->uses_basevertex = 1;
+         break;
+      case nir_intrinsic_load_draw_id:
+         info->uses_drawid = 1;
+         break;
+      case nir_intrinsic_load_primitive_id:
+         info->uses_primid = 1;
+         break;
+      case nir_intrinsic_load_sample_mask_in:
+         info->reads_samplemask = true;
+         break;
+      case nir_intrinsic_load_tess_level_inner:
+      case nir_intrinsic_load_tess_level_outer:
+         info->reads_tess_factors = true;
+         break;
+      case nir_intrinsic_bindless_image_load:
+         info->uses_bindless_images = true;
+
+         if (nir_intrinsic_image_dim(intr) == GLSL_SAMPLER_DIM_BUF)
+            info->uses_bindless_buffer_load = true;
+         else
+            info->uses_bindless_image_load = true;
+         break;
+      case nir_intrinsic_bindless_image_size:
+      case nir_intrinsic_bindless_image_samples:
+         info->uses_bindless_images = true;
+         break;
+      case nir_intrinsic_bindless_image_store:
+         info->uses_bindless_images = true;
+
+         if (nir_intrinsic_image_dim(intr) == GLSL_SAMPLER_DIM_BUF)
+            info->uses_bindless_buffer_store = true;
+         else
+            info->uses_bindless_image_store = true;
+
+         info->writes_memory = true;
+         break;
+      case nir_intrinsic_image_deref_store:
+         info->writes_memory = true;
+         break;
+      case nir_intrinsic_bindless_image_atomic_add:
+      case nir_intrinsic_bindless_image_atomic_imin:
+      case nir_intrinsic_bindless_image_atomic_imax:
+      case nir_intrinsic_bindless_image_atomic_umin:
+      case nir_intrinsic_bindless_image_atomic_umax:
+      case nir_intrinsic_bindless_image_atomic_and:
+      case nir_intrinsic_bindless_image_atomic_or:
+      case nir_intrinsic_bindless_image_atomic_xor:
+      case nir_intrinsic_bindless_image_atomic_exchange:
+      case nir_intrinsic_bindless_image_atomic_comp_swap:
+         info->uses_bindless_images = true;
+
+         if (nir_intrinsic_image_dim(intr) == GLSL_SAMPLER_DIM_BUF)
+            info->uses_bindless_buffer_atomic = true;
+         else
+            info->uses_bindless_image_atomic = true;
+
+         info->writes_memory = true;
+         break;
+      case nir_intrinsic_image_deref_atomic_add:
+      case nir_intrinsic_image_deref_atomic_imin:
+      case nir_intrinsic_image_deref_atomic_imax:
+      case nir_intrinsic_image_deref_atomic_umin:
+      case nir_intrinsic_image_deref_atomic_umax:
+      case nir_intrinsic_image_deref_atomic_and:
+      case nir_intrinsic_image_deref_atomic_or:
+      case nir_intrinsic_image_deref_atomic_xor:
+      case nir_intrinsic_image_deref_atomic_exchange:
+      case nir_intrinsic_image_deref_atomic_comp_swap:
+         info->writes_memory = true;
+         break;
+      case nir_intrinsic_store_ssbo:
+      case nir_intrinsic_ssbo_atomic_add:
+      case nir_intrinsic_ssbo_atomic_imin:
+      case nir_intrinsic_ssbo_atomic_umin:
+      case nir_intrinsic_ssbo_atomic_imax:
+      case nir_intrinsic_ssbo_atomic_umax:
+      case nir_intrinsic_ssbo_atomic_and:
+      case nir_intrinsic_ssbo_atomic_or:
+      case nir_intrinsic_ssbo_atomic_xor:
+      case nir_intrinsic_ssbo_atomic_exchange:
+      case nir_intrinsic_ssbo_atomic_comp_swap:
+         info->writes_memory = true;
+         break;
+      case nir_intrinsic_load_deref: {
+         nir_variable *var = intrinsic_get_var(intr);
+         nir_variable_mode mode = var->data.mode;
+         nir_deref_instr *const deref = nir_src_as_deref(intr->src[0]);
+         enum glsl_base_type base_type =
+            glsl_get_base_type(glsl_without_array(var->type));
+
+         if (nir_deref_instr_has_indirect(deref)) {
+            if (mode == nir_var_shader_in)
+               info->indirect_files |= (1 << TGSI_FILE_INPUT);
+         }
+         if (mode == nir_var_shader_in) {
+            gather_intrinsic_load_deref_info(nir, intr, deref, need_texcoord, var, info);
+
+            switch (var->data.interpolation) {
+            case INTERP_MODE_NONE:
+               if (glsl_base_type_is_integer(base_type))
+                  break;
+
+               /* fall-through */
+            case INTERP_MODE_SMOOTH:
+               if (var->data.sample)
+                  info->uses_persp_sample = true;
+               else if (var->data.centroid)
+                  info->uses_persp_centroid = true;
+               else
+                  info->uses_persp_center = true;
+               break;
+
+            case INTERP_MODE_NOPERSPECTIVE:
+               if (var->data.sample)
+                  info->uses_linear_sample = true;
+               else if (var->data.centroid)
+                  info->uses_linear_centroid = true;
+               else
+                  info->uses_linear_center = true;
+               break;
+            }
+         }
+         break;
+      }
+      case nir_intrinsic_interp_deref_at_centroid:
+      case nir_intrinsic_interp_deref_at_sample:
+      case nir_intrinsic_interp_deref_at_offset: {
+         enum glsl_interp_mode interp = intrinsic_get_var(intr)->data.interpolation;
+         switch (interp) {
+         case INTERP_MODE_SMOOTH:
+         case INTERP_MODE_NONE:
+            if (intr->intrinsic == nir_intrinsic_interp_deref_at_centroid)
+               info->uses_persp_opcode_interp_centroid = true;
+            else if (intr->intrinsic == nir_intrinsic_interp_deref_at_sample)
+               info->uses_persp_opcode_interp_sample = true;
+            else
+               info->uses_persp_opcode_interp_offset = true;
+            break;
+         case INTERP_MODE_NOPERSPECTIVE:
+            if (intr->intrinsic == nir_intrinsic_interp_deref_at_centroid)
+               info->uses_linear_opcode_interp_centroid = true;
+            else if (intr->intrinsic == nir_intrinsic_interp_deref_at_sample)
+               info->uses_linear_opcode_interp_sample = true;
+            else
+               info->uses_linear_opcode_interp_offset = true;
+            break;
+         case INTERP_MODE_FLAT:
+            break;
+         default:
+            unreachable("Unsupported interpoation type");
+         }
+         break;
+      }
+      default:
+         break;
+      }
+   }
+}
+
+void nir_tgsi_scan_shader(const struct nir_shader *nir,
+                          struct tgsi_shader_info *info,
+                          bool need_texcoord)
+{
+   nir_function *func;
+   unsigned i;
+
+   info->processor = pipe_shader_type_from_mesa(nir->info.stage);
+   info->num_tokens = 2; /* indicate that the shader is non-empty */
+   info->num_instructions = 2;
+
+   info->properties[TGSI_PROPERTY_NEXT_SHADER] =
+      pipe_shader_type_from_mesa(nir->info.next_stage);
+
+   if (nir->info.stage == MESA_SHADER_VERTEX) {
+      info->properties[TGSI_PROPERTY_VS_WINDOW_SPACE_POSITION] =
+         nir->info.vs.window_space_position;
+   }
+
+   if (nir->info.stage == MESA_SHADER_TESS_CTRL) {
+      info->properties[TGSI_PROPERTY_TCS_VERTICES_OUT] =
+         nir->info.tess.tcs_vertices_out;
+   }
+
+   if (nir->info.stage == MESA_SHADER_TESS_EVAL) {
+      if (nir->info.tess.primitive_mode == GL_ISOLINES)
+         info->properties[TGSI_PROPERTY_TES_PRIM_MODE] = PIPE_PRIM_LINES;
+      else
+         info->properties[TGSI_PROPERTY_TES_PRIM_MODE] = nir->info.tess.primitive_mode;
+
+      STATIC_ASSERT((TESS_SPACING_EQUAL + 1) % 3 == PIPE_TESS_SPACING_EQUAL);
+      STATIC_ASSERT((TESS_SPACING_FRACTIONAL_ODD + 1) % 3 ==
+                    PIPE_TESS_SPACING_FRACTIONAL_ODD);
+      STATIC_ASSERT((TESS_SPACING_FRACTIONAL_EVEN + 1) % 3 ==
+                    PIPE_TESS_SPACING_FRACTIONAL_EVEN);
+
+      info->properties[TGSI_PROPERTY_TES_SPACING] = (nir->info.tess.spacing + 1) % 3;
+      info->properties[TGSI_PROPERTY_TES_VERTEX_ORDER_CW] = !nir->info.tess.ccw;
+      info->properties[TGSI_PROPERTY_TES_POINT_MODE] = nir->info.tess.point_mode;
+   }
+
+   if (nir->info.stage == MESA_SHADER_GEOMETRY) {
+      info->properties[TGSI_PROPERTY_GS_INPUT_PRIM] = nir->info.gs.input_primitive;
+      info->properties[TGSI_PROPERTY_GS_OUTPUT_PRIM] = nir->info.gs.output_primitive;
+      info->properties[TGSI_PROPERTY_GS_MAX_OUTPUT_VERTICES] = nir->info.gs.vertices_out;
+      info->properties[TGSI_PROPERTY_GS_INVOCATIONS] = nir->info.gs.invocations;
+   }
+
+   if (nir->info.stage == MESA_SHADER_FRAGMENT) {
+      info->properties[TGSI_PROPERTY_FS_EARLY_DEPTH_STENCIL] =
+         nir->info.fs.early_fragment_tests | nir->info.fs.post_depth_coverage;
+      info->properties[TGSI_PROPERTY_FS_POST_DEPTH_COVERAGE] = nir->info.fs.post_depth_coverage;
+
+      if (nir->info.fs.pixel_center_integer) {
+         info->properties[TGSI_PROPERTY_FS_COORD_PIXEL_CENTER] =
+            TGSI_FS_COORD_PIXEL_CENTER_INTEGER;
+      }
+
+      if (nir->info.fs.depth_layout != FRAG_DEPTH_LAYOUT_NONE) {
+         switch (nir->info.fs.depth_layout) {
+         case FRAG_DEPTH_LAYOUT_ANY:
+            info->properties[TGSI_PROPERTY_FS_DEPTH_LAYOUT] = TGSI_FS_DEPTH_LAYOUT_ANY;
+            break;
+         case FRAG_DEPTH_LAYOUT_GREATER:
+            info->properties[TGSI_PROPERTY_FS_DEPTH_LAYOUT] = TGSI_FS_DEPTH_LAYOUT_GREATER;
+            break;
+         case FRAG_DEPTH_LAYOUT_LESS:
+            info->properties[TGSI_PROPERTY_FS_DEPTH_LAYOUT] = TGSI_FS_DEPTH_LAYOUT_LESS;
+            break;
+         case FRAG_DEPTH_LAYOUT_UNCHANGED:
+            info->properties[TGSI_PROPERTY_FS_DEPTH_LAYOUT] = TGSI_FS_DEPTH_LAYOUT_UNCHANGED;
+            break;
+         default:
+            unreachable("Unknow depth layout");
+         }
+      }
+   }
+
+   if (gl_shader_stage_is_compute(nir->info.stage)) {
+      info->properties[TGSI_PROPERTY_CS_FIXED_BLOCK_WIDTH] = nir->info.cs.local_size[0];
+      info->properties[TGSI_PROPERTY_CS_FIXED_BLOCK_HEIGHT] = nir->info.cs.local_size[1];
+      info->properties[TGSI_PROPERTY_CS_FIXED_BLOCK_DEPTH] = nir->info.cs.local_size[2];
+   }
+
+   i = 0;
+   uint64_t processed_inputs = 0;
+   nir_foreach_variable(variable, &nir->inputs) {
+      unsigned semantic_name, semantic_index;
+
+      const struct glsl_type *type = variable->type;
+      if (nir_is_per_vertex_io(variable, nir->info.stage)) {
+         assert(glsl_type_is_array(type));
+         type = glsl_get_array_element(type);
+      }
+
+      unsigned attrib_count = glsl_count_attribute_slots(type,
+                                                         nir->info.stage == MESA_SHADER_VERTEX);
+
+      i = variable->data.driver_location;
+
+      /* Vertex shader inputs don't have semantics. The state
+       * tracker has already mapped them to attributes via
+       * variable->data.driver_location.
+       */
+      if (nir->info.stage == MESA_SHADER_VERTEX) {
+         continue;
+      }
+
+      for (unsigned j = 0; j < attrib_count; j++, i++) {
+
+         if (processed_inputs & ((uint64_t)1 << i))
+            continue;
+
+         processed_inputs |= ((uint64_t)1 << i);
+
+         tgsi_get_gl_varying_semantic(variable->data.location + j, need_texcoord,
+                                      &semantic_name, &semantic_index);
+
+         info->input_semantic_name[i] = semantic_name;
+         info->input_semantic_index[i] = semantic_index;
+
+         if (semantic_name == TGSI_SEMANTIC_PRIMID)
+            info->uses_primid = true;
+
+         enum glsl_base_type base_type =
+            glsl_get_base_type(glsl_without_array(variable->type));
+
+         switch (variable->data.interpolation) {
+         case INTERP_MODE_NONE:
+            if (glsl_base_type_is_integer(base_type)) {
+               info->input_interpolate[i] = TGSI_INTERPOLATE_CONSTANT;
+               break;
+            }
+
+            if (semantic_name == TGSI_SEMANTIC_COLOR) {
+               info->input_interpolate[i] = TGSI_INTERPOLATE_COLOR;
+               break;
+            }
+            /* fall-through */
+
+         case INTERP_MODE_SMOOTH:
+            assert(!glsl_base_type_is_integer(base_type));
+
+            info->input_interpolate[i] = TGSI_INTERPOLATE_PERSPECTIVE;
+            break;
+
+         case INTERP_MODE_NOPERSPECTIVE:
+            assert(!glsl_base_type_is_integer(base_type));
+
+            info->input_interpolate[i] = TGSI_INTERPOLATE_LINEAR;
+            break;
+
+         case INTERP_MODE_FLAT:
+            info->input_interpolate[i] = TGSI_INTERPOLATE_CONSTANT;
+            break;
+         }
+      }
+   }
+
+   info->num_inputs = nir->num_inputs;
+   info->file_max[TGSI_FILE_INPUT] = nir->num_inputs - 1;
+
+   i = 0;
+   uint64_t processed_outputs = 0;
+   unsigned num_outputs = 0;
+   nir_foreach_variable(variable, &nir->outputs) {
+      unsigned semantic_name, semantic_index;
+
+      i = variable->data.driver_location;
+
+      const struct glsl_type *type = variable->type;
+      if (nir_is_per_vertex_io(variable, nir->info.stage)) {
+         assert(glsl_type_is_array(type));
+         type = glsl_get_array_element(type);
+      }
+
+      unsigned attrib_count = glsl_count_attribute_slots(type, false);
+      for (unsigned k = 0; k < attrib_count; k++, i++) {
+
+         if (nir->info.stage == MESA_SHADER_FRAGMENT) {
+            tgsi_get_gl_frag_result_semantic(variable->data.location + k,
+                                             &semantic_name, &semantic_index);
+
+            /* Adjust for dual source blending */
+            if (variable->data.index > 0) {
+               semantic_index++;
+            }
+         } else {
+            tgsi_get_gl_varying_semantic(variable->data.location + k, need_texcoord,
+                                         &semantic_name, &semantic_index);
+         }
+
+         unsigned num_components = 4;
+         unsigned vector_elements = glsl_get_vector_elements(glsl_without_array(variable->type));
+         if (vector_elements)
+            num_components = vector_elements;
+
+         unsigned component = variable->data.location_frac;
+         if (glsl_type_is_64bit(glsl_without_array(variable->type))) {
+            if (glsl_type_is_dual_slot(glsl_without_array(variable->type)) && k % 2) {
+               num_components = (num_components * 2) - 4;
+               component = 0;
+            } else {
+               num_components = MIN2(num_components * 2, 4);
+            }
+         }
+
+         ubyte usagemask = 0;
+         for (unsigned j = component; j < num_components + component; j++) {
+            switch (j) {
+            case 0:
+               usagemask |= TGSI_WRITEMASK_X;
+               break;
+            case 1:
+               usagemask |= TGSI_WRITEMASK_Y;
+               break;
+            case 2:
+               usagemask |= TGSI_WRITEMASK_Z;
+               break;
+            case 3:
+               usagemask |= TGSI_WRITEMASK_W;
+               break;
+            default:
+               unreachable("error calculating component index");
+            }
+         }
+
+         unsigned gs_out_streams;
+         if (variable->data.stream & NIR_STREAM_PACKED) {
+            gs_out_streams = variable->data.stream & ~NIR_STREAM_PACKED;
+         } else {
+            assert(variable->data.stream < 4);
+            gs_out_streams = 0;
+            for (unsigned j = 0; j < num_components; ++j)
+               gs_out_streams |= variable->data.stream << (2 * (component + j));
+         }
+
+         unsigned streamx = gs_out_streams & 3;
+         unsigned streamy = (gs_out_streams >> 2) & 3;
+         unsigned streamz = (gs_out_streams >> 4) & 3;
+         unsigned streamw = (gs_out_streams >> 6) & 3;
+
+         if (usagemask & TGSI_WRITEMASK_X) {
+            info->output_usagemask[i] |= TGSI_WRITEMASK_X;
+            info->output_streams[i] |= streamx;
+            info->num_stream_output_components[streamx]++;
+         }
+         if (usagemask & TGSI_WRITEMASK_Y) {
+            info->output_usagemask[i] |= TGSI_WRITEMASK_Y;
+            info->output_streams[i] |= streamy << 2;
+            info->num_stream_output_components[streamy]++;
+         }
+         if (usagemask & TGSI_WRITEMASK_Z) {
+            info->output_usagemask[i] |= TGSI_WRITEMASK_Z;
+            info->output_streams[i] |= streamz << 4;
+            info->num_stream_output_components[streamz]++;
+         }
+         if (usagemask & TGSI_WRITEMASK_W) {
+            info->output_usagemask[i] |= TGSI_WRITEMASK_W;
+            info->output_streams[i] |= streamw << 6;
+            info->num_stream_output_components[streamw]++;
+         }
+
+         /* make sure we only count this location once against
+          * the num_outputs counter.
+          */
+         if (processed_outputs & ((uint64_t)1 << i))
+            continue;
+
+         processed_outputs |= ((uint64_t)1 << i);
+         num_outputs++;
+
+         info->output_semantic_name[i] = semantic_name;
+         info->output_semantic_index[i] = semantic_index;
+
+         switch (semantic_name) {
+         case TGSI_SEMANTIC_PRIMID:
+            info->writes_primid = true;
+            break;
+         case TGSI_SEMANTIC_VIEWPORT_INDEX:
+            info->writes_viewport_index = true;
+            break;
+         case TGSI_SEMANTIC_LAYER:
+            info->writes_layer = true;
+            break;
+         case TGSI_SEMANTIC_PSIZE:
+            info->writes_psize = true;
+            break;
+         case TGSI_SEMANTIC_CLIPVERTEX:
+            info->writes_clipvertex = true;
+            break;
+         case TGSI_SEMANTIC_COLOR:
+            info->colors_written |= 1 << semantic_index;
+            break;
+         case TGSI_SEMANTIC_STENCIL:
+            info->writes_stencil = true;
+            break;
+         case TGSI_SEMANTIC_SAMPLEMASK:
+            info->writes_samplemask = true;
+            break;
+         case TGSI_SEMANTIC_EDGEFLAG:
+            info->writes_edgeflag = true;
+            break;
+         case TGSI_SEMANTIC_POSITION:
+            if (info->processor == PIPE_SHADER_FRAGMENT)
+               info->writes_z = true;
+            else
+               info->writes_position = true;
+            break;
+         }
+
+         if (nir->info.stage == MESA_SHADER_TESS_CTRL) {
+            switch (semantic_name) {
+            case TGSI_SEMANTIC_PATCH:
+               info->reads_perpatch_outputs = true;
+               break;
+            case TGSI_SEMANTIC_TESSINNER:
+            case TGSI_SEMANTIC_TESSOUTER:
+               info->reads_tessfactor_outputs = true;
+               break;
+            default:
+               info->reads_pervertex_outputs = true;
+            }
+         }
+      }
+
+      unsigned loc = variable->data.location;
+      if (nir->info.stage == MESA_SHADER_FRAGMENT &&
+          loc == FRAG_RESULT_COLOR &&
+          nir->info.outputs_written & (1ull << loc)) {
+         assert(attrib_count == 1);
+         info->properties[TGSI_PROPERTY_FS_COLOR0_WRITES_ALL_CBUFS] = true;
+      }
+   }
+
+   info->num_outputs = num_outputs;
+
+   info->const_file_max[0] = nir->num_uniforms - 1;
+   info->const_buffers_declared = u_bit_consecutive(1, nir->info.num_ubos);
+   if (nir->num_uniforms > 0)
+     info->const_buffers_declared |= 1;
+   info->images_declared = u_bit_consecutive(0, nir->info.num_images);
+   info->samplers_declared = nir->info.textures_used;
+
+   info->file_max[TGSI_FILE_SAMPLER] = util_last_bit(info->samplers_declared) - 1;
+   info->file_max[TGSI_FILE_SAMPLER_VIEW] = info->file_max[TGSI_FILE_SAMPLER];
+   info->file_mask[TGSI_FILE_SAMPLER] = info->file_mask[TGSI_FILE_SAMPLER_VIEW] = info->samplers_declared;
+   info->file_max[TGSI_FILE_IMAGE] = util_last_bit(info->images_declared) - 1;
+   info->file_mask[TGSI_FILE_IMAGE] = info->images_declared;
+
+   info->num_written_clipdistance = nir->info.clip_distance_array_size;
+   info->num_written_culldistance = nir->info.cull_distance_array_size;
+   info->clipdist_writemask = u_bit_consecutive(0, info->num_written_clipdistance);
+   info->culldist_writemask = u_bit_consecutive(0, info->num_written_culldistance);
+
+   if (info->processor == PIPE_SHADER_FRAGMENT)
+      info->uses_kill = nir->info.fs.uses_discard;
+
+   func = (struct nir_function *)exec_list_get_head_const(&nir->functions);
+   nir_foreach_block(block, func->impl) {
+      nir_foreach_instr(instr, block)
+         scan_instruction(nir, need_texcoord, info, instr);
+   }
+}
diff --git a/src/gallium/auxiliary/nir/nir_to_tgsi_info.h b/src/gallium/auxiliary/nir/nir_to_tgsi_info.h
new file mode 100644
index 00000000000..c2b8639b697
--- /dev/null
+++ b/src/gallium/auxiliary/nir/nir_to_tgsi_info.h
@@ -0,0 +1,42 @@
+/*
+ * Copyright 2019 Red Hat
+ * All Rights Reserved.
+ *
+ * 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
+ * on the rights to use, copy, modify, merge, publish, distribute, sub
+ * license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHOR(S) AND/OR THEIR SUPPLIERS 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.
+ */
+#ifndef _NIR_TO_TGSI_INFO_H_
+#define _NIR_TO_TGSI_INFO_H_
+
+#include <stdbool.h>
+struct nir_shader;
+struct tgsi_shader_info;
+
+/* only llvmpipe uses this path, so handle draw not using llvm */
+#ifdef LLVM_AVAILABLE
+void nir_tgsi_scan_shader(const struct nir_shader *nir,
+                          struct tgsi_shader_info *info,
+                          bool need_texcoord);
+#else
+static inline void nir_tgsi_scan_shader(const struct nir_shader *nir,
+                                        struct tgsi_shader_info *info,
+                                        bool need_texcoord) {}
+#endif
+
+#endif