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