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/**************************************************************************

 *

 * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.

 * All Rights Reserved.

 * Copyright 2008 VMware, 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 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 TUNGSTEN GRAPHICS AND/OR ITS 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.

 *

 **************************************************************************/

/**

 * TGSI program scan utility.

 * Used to determine which registers and instructions are used by a shader.

 *

 * Authors:  Brian Paul

 */

#include "util/u_debug.h"

#include "util/u_math.h"

#include "util/u_prim.h"

#include "tgsi/tgsi_parse.h"

#include "tgsi/tgsi_util.h"

#include "tgsi/tgsi_scan.h"

/**

 * Scan the given TGSI shader to collect information such as number of

 * registers used, special instructions used, etc.

 * \return info  the result of the scan

 */

void

tgsi_scan_shader(const struct tgsi_token *tokens,

                 struct tgsi_shader_info *info)

{

   uint procType, i;

   struct tgsi_parse_context parse;

   memset(info, 0, sizeof(*info));

   for (i = 0; i < TGSI_FILE_COUNT; i++)

      info->file_max[i] = -1;

   /**

    ** Setup to begin parsing input shader

    **/

   if (tgsi_parse_init( &parse, tokens ) != TGSI_PARSE_OK) {

      debug_printf("tgsi_parse_init() failed in tgsi_scan_shader()!\n");

      return;

   }

   procType = parse.FullHeader.Processor.Processor;

   assert(procType == TGSI_PROCESSOR_FRAGMENT ||

          procType == TGSI_PROCESSOR_VERTEX ||

          procType == TGSI_PROCESSOR_GEOMETRY ||

          procType == TGSI_PROCESSOR_COMPUTE);

   info->processor = procType;

   /**

    ** Loop over incoming program tokens/instructions

    */

   while( !tgsi_parse_end_of_tokens( &parse ) ) {

      info->num_tokens++;

      tgsi_parse_token( &parse );

      switch( parse.FullToken.Token.Type ) {

      case TGSI_TOKEN_TYPE_INSTRUCTION:

         {

            const struct tgsi_full_instruction *fullinst

               = &parse.FullToken.FullInstruction;

            uint i;

            assert(fullinst->Instruction.Opcode < TGSI_OPCODE_LAST);

            info->opcode_count[fullinst->Instruction.Opcode]++;

            for (i = 0; i < fullinst->Instruction.NumSrcRegs; i++) {

               const struct tgsi_full_src_register *src =

                  &fullinst->Src[i];

               int ind = src->Register.Index;

               /* Mark which inputs are effectively used */

               if (src->Register.File == TGSI_FILE_INPUT) {

                  unsigned usage_mask;

                  usage_mask = tgsi_util_get_inst_usage_mask(fullinst, i);

                  if (src->Register.Indirect) {

                     for (ind = 0; ind < info->num_inputs; ++ind) {

                        info->input_usage_mask[ind] |= usage_mask;

                     }

                  } else {

                     assert(ind >= 0);

                     assert(ind < PIPE_MAX_SHADER_INPUTS);

                     info->input_usage_mask[ind] |= usage_mask;

                  }

                  if (procType == TGSI_PROCESSOR_FRAGMENT &&

                      src->Register.File == TGSI_FILE_INPUT &&

                      info->reads_position &&

                      src->Register.Index == 0 &&

                      (src->Register.SwizzleX == TGSI_SWIZZLE_Z ||

                       src->Register.SwizzleY == TGSI_SWIZZLE_Z ||

                       src->Register.SwizzleZ == TGSI_SWIZZLE_Z ||

                       src->Register.SwizzleW == TGSI_SWIZZLE_Z)) {

                     info->reads_z = TRUE;

                  }

               }

               /* check for indirect register reads */

               if (src->Register.Indirect) {

                  info->indirect_files |= (1 << src->Register.File);

               }

            }

            /* check for indirect register writes */

            for (i = 0; i < fullinst->Instruction.NumDstRegs; i++) {

               const struct tgsi_full_dst_register *dst = &fullinst->Dst[i];

               if (dst->Register.Indirect) {

                  info->indirect_files |= (1 << dst->Register.File);

               }

            }

            info->num_instructions++;

         }

         break;

      case TGSI_TOKEN_TYPE_DECLARATION:

         {

            const struct tgsi_full_declaration *fulldecl

               = &parse.FullToken.FullDeclaration;

            const uint file = fulldecl->Declaration.File;

            uint reg;

            for (reg = fulldecl->Range.First;

                 reg <= fulldecl->Range.Last;

                 reg++) {

               /* only first 32 regs will appear in this bitfield */

               info->file_mask[file] |= (1 << reg);

               info->file_count[file]++;

               info->file_max[file] = MAX2(info->file_max[file], (int)reg);

               if (file == TGSI_FILE_INPUT) {

                  info->input_semantic_name[reg] = (ubyte)fulldecl->Semantic.Name;

                  info->input_semantic_index[reg] = (ubyte)fulldecl->Semantic.Index;

                  info->input_interpolate[reg] = (ubyte)fulldecl->Interp.Interpolate;

                  info->input_centroid[reg] = (ubyte)fulldecl->Interp.Centroid;

                  info->input_cylindrical_wrap[reg] = (ubyte)fulldecl->Interp.CylindricalWrap;

                  info->num_inputs++;

                  if (procType == TGSI_PROCESSOR_FRAGMENT &&

                      fulldecl->Semantic.Name == TGSI_SEMANTIC_POSITION)

                        info->reads_position = TRUE;

               }

               else if (file == TGSI_FILE_SYSTEM_VALUE) {

                  unsigned index = fulldecl->Range.First;

                  unsigned semName = fulldecl->Semantic.Name;

                  info->system_value_semantic_name[index] = semName;

                  info->num_system_values = MAX2(info->num_system_values,

                                                 index + 1);

                  /*

                  info->system_value_semantic_name[info->num_system_values++] =

                     fulldecl->Semantic.Name;

                  */

                  if (fulldecl->Semantic.Name == TGSI_SEMANTIC_INSTANCEID) {

                     info->uses_instanceid = TRUE;

                  }

                  else if (fulldecl->Semantic.Name == TGSI_SEMANTIC_VERTEXID) {

                     info->uses_vertexid = TRUE;

                  } else if (fulldecl->Semantic.Name == TGSI_SEMANTIC_PRIMID) {

                     info->uses_primid = TRUE;

                  }

               }

               else if (file == TGSI_FILE_OUTPUT) {

                  info->output_semantic_name[reg] = (ubyte)fulldecl->Semantic.Name;

                  info->output_semantic_index[reg] = (ubyte)fulldecl->Semantic.Index;

                  info->num_outputs++;

                  if ((procType == TGSI_PROCESSOR_VERTEX || procType == TGSI_PROCESSOR_GEOMETRY) &&

                      fulldecl->Semantic.Name == TGSI_SEMANTIC_CLIPDIST) {

                     info->num_written_clipdistance += util_bitcount(fulldecl->Declaration.UsageMask);

                  }

                  if ((procType == TGSI_PROCESSOR_VERTEX || procType == TGSI_PROCESSOR_GEOMETRY) &&

                      fulldecl->Semantic.Name == TGSI_SEMANTIC_CULLDIST) {

                     info->num_written_culldistance += util_bitcount(fulldecl->Declaration.UsageMask);

                  }

                  /* extra info for special outputs */

                  if (procType == TGSI_PROCESSOR_FRAGMENT &&

                      fulldecl->Semantic.Name == TGSI_SEMANTIC_POSITION)

                        info->writes_z = TRUE;

                  if (procType == TGSI_PROCESSOR_FRAGMENT &&

                      fulldecl->Semantic.Name == TGSI_SEMANTIC_STENCIL)

                        info->writes_stencil = TRUE;

                  if (procType == TGSI_PROCESSOR_VERTEX &&

                      fulldecl->Semantic.Name == TGSI_SEMANTIC_EDGEFLAG) {

                     info->writes_edgeflag = TRUE;

                  }

                  if (procType == TGSI_PROCESSOR_GEOMETRY &&

                      fulldecl->Semantic.Name ==

                      TGSI_SEMANTIC_VIEWPORT_INDEX) {

                     info->writes_viewport_index = TRUE;

                  }

                  if (procType == TGSI_PROCESSOR_GEOMETRY &&

                      fulldecl->Semantic.Name ==

                      TGSI_SEMANTIC_LAYER) {

                     info->writes_layer = TRUE;

                  }

               }

             }

         }

         break;

      case TGSI_TOKEN_TYPE_IMMEDIATE:

         {

            uint reg = info->immediate_count++;

            uint file = TGSI_FILE_IMMEDIATE;

            info->file_mask[file] |= (1 << reg);

            info->file_count[file]++;

            info->file_max[file] = MAX2(info->file_max[file], (int)reg);

         }

         break;

      case TGSI_TOKEN_TYPE_PROPERTY:

         {

            const struct tgsi_full_property *fullprop

               = &parse.FullToken.FullProperty;

            info->properties[info->num_properties].name =

               fullprop->Property.PropertyName;

            memcpy(info->properties[info->num_properties].data,

                   fullprop->u, 8 * sizeof(unsigned));;

            ++info->num_properties;

         }

         break;

      default:

         assert( 0 );

      }

   }

   info->uses_kill = (info->opcode_count[TGSI_OPCODE_KILL_IF] ||

                      info->opcode_count[TGSI_OPCODE_KILL]);

   /* extract simple properties */

   for (i = 0; i < info->num_properties; ++i) {

      switch (info->properties[i].name) {

      case TGSI_PROPERTY_FS_COORD_ORIGIN:

         info->origin_lower_left = info->properties[i].data[0];

         break;

      case TGSI_PROPERTY_FS_COORD_PIXEL_CENTER:

         info->pixel_center_integer = info->properties[i].data[0];

         break;

      case TGSI_PROPERTY_FS_COLOR0_WRITES_ALL_CBUFS:

         info->color0_writes_all_cbufs = info->properties[i].data[0];

         break;

      case TGSI_PROPERTY_GS_INPUT_PRIM:

         /* The dimensions of the IN decleration in geometry shader have

          * to be deduced from the type of the input primitive.

          */

         if (procType == TGSI_PROCESSOR_GEOMETRY) {

            unsigned input_primitive = info->properties[i].data[0];

            int num_verts = u_vertices_per_prim(input_primitive);

            int j;

            info->file_count[TGSI_FILE_INPUT] = num_verts;

            info->file_max[TGSI_FILE_INPUT] =

               MAX2(info->file_max[TGSI_FILE_INPUT], num_verts - 1);

            for (j = 0; j < num_verts; ++j) {

               info->file_mask[TGSI_FILE_INPUT] |= (1 << j);

            }

         }

         break;

      default:

         ;

      }

   }

   tgsi_parse_free (&parse);

}

/**

 * Check if the given shader is a "passthrough" shader consisting of only

 * MOV instructions of the form:  MOV OUT[n], IN[n]

 *

 */

boolean

tgsi_is_passthrough_shader(const struct tgsi_token *tokens)

{

   struct tgsi_parse_context parse;

   /**

    ** Setup to begin parsing input shader

    **/

   if (tgsi_parse_init(&parse, tokens) != TGSI_PARSE_OK) {

      debug_printf("tgsi_parse_init() failed in tgsi_is_passthrough_shader()!\n");

      return FALSE;

   }

   /**

    ** Loop over incoming program tokens/instructions

    */

   while (!tgsi_parse_end_of_tokens(&parse)) {

      tgsi_parse_token(&parse);

      switch (parse.FullToken.Token.Type) {

      case TGSI_TOKEN_TYPE_INSTRUCTION:

         {

            struct tgsi_full_instruction *fullinst =

               &parse.FullToken.FullInstruction;

            const struct tgsi_full_src_register *src =

               &fullinst->Src[0];

            const struct tgsi_full_dst_register *dst =

               &fullinst->Dst[0];

            /* Do a whole bunch of checks for a simple move */

            if (fullinst->Instruction.Opcode != TGSI_OPCODE_MOV ||

                (src->Register.File != TGSI_FILE_INPUT &&

                 src->Register.File != TGSI_FILE_SYSTEM_VALUE) ||

                dst->Register.File != TGSI_FILE_OUTPUT ||

                src->Register.Index != dst->Register.Index ||

                src->Register.Negate ||

                src->Register.Absolute ||

                src->Register.SwizzleX != TGSI_SWIZZLE_X ||

                src->Register.SwizzleY != TGSI_SWIZZLE_Y ||

                src->Register.SwizzleZ != TGSI_SWIZZLE_Z ||

                src->Register.SwizzleW != TGSI_SWIZZLE_W ||

                dst->Register.WriteMask != TGSI_WRITEMASK_XYZW)

            {

               tgsi_parse_free(&parse);

               return FALSE;

            }

         }

         break;

      case TGSI_TOKEN_TYPE_DECLARATION:

         /* fall-through */

      case TGSI_TOKEN_TYPE_IMMEDIATE:

         /* fall-through */

      case TGSI_TOKEN_TYPE_PROPERTY:

         /* fall-through */

      default:

         ; /* no-op */

      }

   }

   tgsi_parse_free(&parse);

   /* if we get here, it's a pass-through shader */

   return TRUE;

}