src/mesa/drivers/dri/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 "../r300_reg.h"
  39 #include "radeon_compiler.h"
  40
  41 #define MAKE_SWZ3(x, y, z) (RC_MAKE_SWIZZLE(RC_SWIZZLE_##x, RC_SWIZZLE_##y, RC_SWIZZLE_##z, RC_SWIZZLE_ZERO))
  42
  43 struct swizzle_data {
  44         unsigned int hash; /**< swizzle value this matches */
  45         unsigned int base; /**< base value for hw swizzle */
  46         unsigned int stride; /**< difference in base between arg0/1/2 */
  47         unsigned int srcp_stride; /**< difference in base between arg0/scrp */
  48 };
  49
  50 static const struct swizzle_data native_swizzles[] = {
  51         {MAKE_SWZ3(X, Y, Z), R300_ALU_ARGC_SRC0C_XYZ, 4, 15},
  52         {MAKE_SWZ3(X, X, X), R300_ALU_ARGC_SRC0C_XXX, 4, 15},
  53         {MAKE_SWZ3(Y, Y, Y), R300_ALU_ARGC_SRC0C_YYY, 4, 15},
  54         {MAKE_SWZ3(Z, Z, Z), R300_ALU_ARGC_SRC0C_ZZZ, 4, 15},
  55         {MAKE_SWZ3(W, W, W), R300_ALU_ARGC_SRC0A, 1, 7},
  56         {MAKE_SWZ3(Y, Z, X), R300_ALU_ARGC_SRC0C_YZX, 1, 0},
  57         {MAKE_SWZ3(Z, X, Y), R300_ALU_ARGC_SRC0C_ZXY, 1, 0},
  58         {MAKE_SWZ3(W, Z, Y), R300_ALU_ARGC_SRC0CA_WZY, 1, 0},
  59         {MAKE_SWZ3(ONE, ONE, ONE), R300_ALU_ARGC_ONE, 0, 0},
  60         {MAKE_SWZ3(ZERO, ZERO, ZERO), R300_ALU_ARGC_ZERO, 0, 0},
  61         {MAKE_SWZ3(HALF, HALF, HALF), R300_ALU_ARGC_HALF, 0, 0}
  62 };
  63
  64 static const int num_native_swizzles = sizeof(native_swizzles)/sizeof(native_swizzles[0]);
  65
  66 /**
  67  * Find a native RGB swizzle that matches the given swizzle.
  68  * Returns 0 if none found.
  69  */
  70 static const struct swizzle_data* lookup_native_swizzle(unsigned int swizzle)
  71 {
  72         int i, comp;
  73
  74         for(i = 0; i < num_native_swizzles; ++i) {
  75                 const struct swizzle_data* sd = &native_swizzles[i];
  76                 for(comp = 0; comp < 3; ++comp) {
  77                         unsigned int swz = GET_SWZ(swizzle, comp);
  78                         if (swz == RC_SWIZZLE_UNUSED)
  79                                 continue;
  80                         if (swz != GET_SWZ(sd->hash, comp))
  81                                 break;
  82                 }
  83                 if (comp == 3)
  84                         return sd;
  85         }
  86
  87         return 0;
  88 }
  89
  90
  91 /**
  92  * Check whether the given instruction supports the swizzle and negate
  93  * combinations in the given source register.
  94  */
  95 static int r300_swizzle_is_native(rc_opcode opcode, struct rc_src_register reg)
  96 {
  97         const struct swizzle_data* sd;
  98         unsigned int relevant;
  99         int j;
 100
 101         if (reg.Abs)
 102                 reg.Negate = RC_MASK_NONE;
 103
 104         if (opcode == RC_OPCODE_KIL ||
 105             opcode == RC_OPCODE_TEX ||
 106             opcode == RC_OPCODE_TXB ||
 107             opcode == RC_OPCODE_TXP) {
 108                 if (reg.Abs || reg.Negate)
 109                         return 0;
 110
 111                 for(j = 0; j < 4; ++j) {
 112                         unsigned int swz = GET_SWZ(reg.Swizzle, j);
 113                         if (swz == RC_SWIZZLE_UNUSED)
 114                                 continue;
 115                         if (swz != j)
 116                                 return 0;
 117                 }
 118
 119                 return 1;
 120         }
 121
 122         relevant = 0;
 123
 124         for(j = 0; j < 3; ++j)
 125                 if (GET_SWZ(reg.Swizzle, j) != RC_SWIZZLE_UNUSED)
 126                         relevant |= 1 << j;
 127
 128         if ((reg.Negate & relevant) && ((reg.Negate & relevant) != relevant))
 129                 return 0;
 130
 131         sd = lookup_native_swizzle(reg.Swizzle);
 132         if (!sd || (reg.File == RC_FILE_PRESUB && sd->srcp_stride == 0))
 133                 return 0;
 134
 135         return 1;
 136 }
 137
 138
 139 static void r300_swizzle_split(
 140                 struct rc_src_register src, unsigned int mask,
 141                 struct rc_swizzle_split * split)
 142 {
 143         if (src.Abs)
 144                 src.Negate = RC_MASK_NONE;
 145
 146         split->NumPhases = 0;
 147
 148         while(mask) {
 149                 const struct swizzle_data *best_swizzle = 0;
 150                 unsigned int best_matchcount = 0;
 151                 unsigned int best_matchmask = 0;
 152                 int i, comp;
 153
 154                 for(i = 0; i < num_native_swizzles; ++i) {
 155                         const struct swizzle_data *sd = &native_swizzles[i];
 156                         unsigned int matchcount = 0;
 157                         unsigned int matchmask = 0;
 158                         for(comp = 0; comp < 3; ++comp) {
 159                                 unsigned int swz;
 160                                 if (!GET_BIT(mask, comp))
 161                                         continue;
 162                                 swz = GET_SWZ(src.Swizzle, comp);
 163                                 if (swz == RC_SWIZZLE_UNUSED)
 164                                         continue;
 165                                 if (swz == GET_SWZ(sd->hash, comp)) {
 166                                         /* check if the negate bit of current component
 167                                          * is the same for already matched components */
 168                                         if (matchmask && (!!(src.Negate & matchmask) != !!(src.Negate & (1 << comp))))
 169                                                 continue;
 170
 171                                         matchcount++;
 172                                         matchmask |= 1 << comp;
 173                                 }
 174                         }
 175                         if (matchcount > best_matchcount) {
 176                                 best_swizzle = sd;
 177                                 best_matchcount = matchcount;
 178                                 best_matchmask = matchmask;
 179                                 if (matchmask == (mask & RC_MASK_XYZ))
 180                                         break;
 181                         }
 182                 }
 183
 184                 if (mask & RC_MASK_W)
 185                         best_matchmask |= RC_MASK_W;
 186
 187                 split->Phase[split->NumPhases++] = best_matchmask;
 188                 mask &= ~best_matchmask;
 189         }
 190 }
 191
 192 struct rc_swizzle_caps r300_swizzle_caps = {
 193         .IsNative = r300_swizzle_is_native,
 194         .Split = r300_swizzle_split
 195 };
 196
 197
 198 /**
 199  * Translate an RGB (XYZ) swizzle into the hardware code for the given
 200  * instruction source.
 201  */
 202 unsigned int r300FPTranslateRGBSwizzle(unsigned int src, unsigned int swizzle)
 203 {
 204         const struct swizzle_data* sd = lookup_native_swizzle(swizzle);
 205
 206         if (!sd || (src == RC_PAIR_PRESUB_SRC && sd->srcp_stride == 0)) {
 207                 fprintf(stderr, "Not a native swizzle: %08x\n", swizzle);
 208                 return 0;
 209         }
 210
 211         if (src == RC_PAIR_PRESUB_SRC) {
 212                 return sd->base + sd->srcp_stride;
 213         } else {
 214                 return sd->base + src*sd->stride;
 215         }
 216 }
 217
 218
 219 /**
 220  * Translate an Alpha (W) swizzle into the hardware code for the given
 221  * instruction source.
 222  */
 223 unsigned int r300FPTranslateAlphaSwizzle(unsigned int src, unsigned int swizzle)
 224 {
 225         if (src == RC_PAIR_PRESUB_SRC) {
 226                 return R300_ALU_ARGA_SRCP_X + swizzle;
 227         }
 228         if (swizzle < 3)
 229                 return swizzle + 3*src;
 230
 231         switch(swizzle) {
 232         case RC_SWIZZLE_W: return R300_ALU_ARGA_SRC0A + src;
 233         case RC_SWIZZLE_ONE: return R300_ALU_ARGA_ONE;
 234         case RC_SWIZZLE_ZERO: return R300_ALU_ARGA_ZERO;
 235         case RC_SWIZZLE_HALF: return R300_ALU_ARGA_HALF;
 236         default: return R300_ALU_ARGA_ONE;
 237         }
 238 }