src/gallium/drivers/r300/compiler/r300_fragprog_swizzle.c

   1 /*
   2  * Copyright (C) 2008 Nicolai Haehnle.
   3  *
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining
   7  * a copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sublicense, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial
  16  * portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  21  * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  22  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  23  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  24  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  */
  27
  28 /**
  29  * @file
  30  * Utilities to deal with the somewhat odd restriction on R300 fragment
  31  * program swizzles.
  32  */
  33
  34 #include "r300_fragprog_swizzle.h"
  35
  36 #include <stdio.h>
  37
  38 #include "util/macros.h"
  39
  40 #include "r300_reg.h"
  41 #include "radeon_compiler.h"
  42
  43 #define MAKE_SWZ3(x, y, z) (RC_MAKE_SWIZZLE(RC_SWIZZLE_##x, RC_SWIZZLE_##y, RC_SWIZZLE_##z, RC_SWIZZLE_ZERO))
  44
  45 struct swizzle_data {
  46         unsigned int hash; /**< swizzle value this matches */
  47         unsigned int base; /**< base value for hw swizzle */
  48         unsigned int stride; /**< difference in base between arg0/1/2 */
  49         unsigned int srcp_stride; /**< difference in base between arg0/scrp */
  50 };
  51
  52 static const struct swizzle_data native_swizzles[] = {
  53         {MAKE_SWZ3(X, Y, Z), R300_ALU_ARGC_SRC0C_XYZ, 4, 15},
  54         {MAKE_SWZ3(X, X, X), R300_ALU_ARGC_SRC0C_XXX, 4, 15},
  55         {MAKE_SWZ3(Y, Y, Y), R300_ALU_ARGC_SRC0C_YYY, 4, 15},
  56         {MAKE_SWZ3(Z, Z, Z), R300_ALU_ARGC_SRC0C_ZZZ, 4, 15},
  57         {MAKE_SWZ3(W, W, W), R300_ALU_ARGC_SRC0A, 1, 7},
  58         {MAKE_SWZ3(Y, Z, X), R300_ALU_ARGC_SRC0C_YZX, 1, 0},
  59         {MAKE_SWZ3(Z, X, Y), R300_ALU_ARGC_SRC0C_ZXY, 1, 0},
  60         {MAKE_SWZ3(W, Z, Y), R300_ALU_ARGC_SRC0CA_WZY, 1, 0},
  61         {MAKE_SWZ3(ONE, ONE, ONE), R300_ALU_ARGC_ONE, 0, 0},
  62         {MAKE_SWZ3(ZERO, ZERO, ZERO), R300_ALU_ARGC_ZERO, 0, 0},
  63         {MAKE_SWZ3(HALF, HALF, HALF), R300_ALU_ARGC_HALF, 0, 0}
  64 };
  65
  66 static const int num_native_swizzles = ARRAY_SIZE(native_swizzles);
  67
  68 /**
  69  * Find a native RGB swizzle that matches the given swizzle.
  70  * Returns 0 if none found.
  71  */
  72 static const struct swizzle_data* lookup_native_swizzle(unsigned int swizzle)
  73 {
  74         int i, comp;
  75
  76         for(i = 0; i < num_native_swizzles; ++i) {
  77                 const struct swizzle_data* sd = &native_swizzles[i];
  78                 for(comp = 0; comp < 3; ++comp) {
  79                         unsigned int swz = GET_SWZ(swizzle, comp);
  80                         if (swz == RC_SWIZZLE_UNUSED)
  81                                 continue;
  82                         if (swz != GET_SWZ(sd->hash, comp))
  83                                 break;
  84                 }
  85                 if (comp == 3)
  86                         return sd;
  87         }
  88
  89         return 0;
  90 }
  91
  92 /**
  93  * Determines if the given swizzle is valid for r300/r400.  In most situations
  94  * it is better to use r300_swizzle_is_native() which can be accesed via
  95  * struct radeon_compiler *c; c->SwizzleCaps->IsNative().
  96  */
  97 int r300_swizzle_is_native_basic(unsigned int swizzle)
  98 {
  99         if(lookup_native_swizzle(swizzle))
 100                 return 1;
 101         else
 102                 return 0;
 103 }
 104
 105 /**
 106  * Check whether the given instruction supports the swizzle and negate
 107  * combinations in the given source register.
 108  */
 109 static int r300_swizzle_is_native(rc_opcode opcode, struct rc_src_register reg)
 110 {
 111         const struct swizzle_data* sd;
 112         unsigned int relevant;
 113         int j;
 114
 115         if (opcode == RC_OPCODE_KIL ||
 116             opcode == RC_OPCODE_TEX ||
 117             opcode == RC_OPCODE_TXB ||
 118             opcode == RC_OPCODE_TXP) {
 119                 if (reg.Abs || reg.Negate)
 120                         return 0;
 121
 122                 for(j = 0; j < 4; ++j) {
 123                         unsigned int swz = GET_SWZ(reg.Swizzle, j);
 124                         if (swz == RC_SWIZZLE_UNUSED)
 125                                 continue;
 126                         if (swz != j)
 127                                 return 0;
 128                 }
 129
 130                 return 1;
 131         }
 132
 133         relevant = 0;
 134
 135         for(j = 0; j < 3; ++j)
 136                 if (GET_SWZ(reg.Swizzle, j) != RC_SWIZZLE_UNUSED)
 137                         relevant |= 1 << j;
 138
 139         if ((reg.Negate & relevant) && ((reg.Negate & relevant) != relevant))
 140                 return 0;
 141
 142         sd = lookup_native_swizzle(reg.Swizzle);
 143         if (!sd || (reg.File == RC_FILE_PRESUB && sd->srcp_stride == 0))
 144                 return 0;
 145
 146         return 1;
 147 }
 148
 149
 150 static void r300_swizzle_split(
 151                 struct rc_src_register src, unsigned int mask,
 152                 struct rc_swizzle_split * split)
 153 {
 154         split->NumPhases = 0;
 155
 156         while(mask) {
 157                 unsigned int best_matchcount = 0;
 158                 unsigned int best_matchmask = 0;
 159                 int i, comp;
 160
 161                 for(i = 0; i < num_native_swizzles; ++i) {
 162                         const struct swizzle_data *sd = &native_swizzles[i];
 163                         unsigned int matchcount = 0;
 164                         unsigned int matchmask = 0;
 165                         for(comp = 0; comp < 3; ++comp) {
 166                                 unsigned int swz;
 167                                 if (!GET_BIT(mask, comp))
 168                                         continue;
 169                                 swz = GET_SWZ(src.Swizzle, comp);
 170                                 if (swz == RC_SWIZZLE_UNUSED)
 171                                         continue;
 172                                 if (swz == GET_SWZ(sd->hash, comp)) {
 173                                         /* check if the negate bit of current component
 174                                          * is the same for already matched components */
 175                                         if (matchmask && (!!(src.Negate & matchmask) != !!(src.Negate & (1 << comp))))
 176                                                 continue;
 177
 178                                         matchcount++;
 179                                         matchmask |= 1 << comp;
 180                                 }
 181                         }
 182                         if (matchcount > best_matchcount) {
 183                                 best_matchcount = matchcount;
 184                                 best_matchmask = matchmask;
 185                                 if (matchmask == (mask & RC_MASK_XYZ))
 186                                         break;
 187                         }
 188                 }
 189
 190                 if (mask & RC_MASK_W)
 191                         best_matchmask |= RC_MASK_W;
 192
 193                 split->Phase[split->NumPhases++] = best_matchmask;
 194                 mask &= ~best_matchmask;
 195         }
 196 }
 197
 198 struct rc_swizzle_caps r300_swizzle_caps = {
 199         .IsNative = r300_swizzle_is_native,
 200         .Split = r300_swizzle_split
 201 };
 202
 203
 204 /**
 205  * Translate an RGB (XYZ) swizzle into the hardware code for the given
 206  * instruction source.
 207  */
 208 unsigned int r300FPTranslateRGBSwizzle(unsigned int src, unsigned int swizzle)
 209 {
 210         const struct swizzle_data* sd = lookup_native_swizzle(swizzle);
 211
 212         if (!sd || (src == RC_PAIR_PRESUB_SRC && sd->srcp_stride == 0)) {
 213                 fprintf(stderr, "Not a native swizzle: %08x\n", swizzle);
 214                 return 0;
 215         }
 216
 217         if (src == RC_PAIR_PRESUB_SRC) {
 218                 return sd->base + sd->srcp_stride;
 219         } else {
 220                 return sd->base + src*sd->stride;
 221         }
 222 }
 223
 224
 225 /**
 226  * Translate an Alpha (W) swizzle into the hardware code for the given
 227  * instruction source.
 228  */
 229 unsigned int r300FPTranslateAlphaSwizzle(unsigned int src, unsigned int swizzle)
 230 {
 231         unsigned int swz = GET_SWZ(swizzle, 0);
 232         if (src == RC_PAIR_PRESUB_SRC) {
 233                 return R300_ALU_ARGA_SRCP_X + swz;
 234         }
 235         if (swz < 3)
 236                 return swz + 3*src;
 237
 238         switch(swz) {
 239         case RC_SWIZZLE_W: return R300_ALU_ARGA_SRC0A + src;
 240         case RC_SWIZZLE_ONE: return R300_ALU_ARGA_ONE;
 241         case RC_SWIZZLE_ZERO: return R300_ALU_ARGA_ZERO;
 242         case RC_SWIZZLE_HALF: return R300_ALU_ARGA_HALF;
 243         default: return R300_ALU_ARGA_ONE;
 244         }
 245 }