src/mesa/drivers/dri/r300/compiler/r3xx_fragprog.c

   1 /*
   2  * Copyright 2009 Nicolai Hähnle <nhaehnle@gmail.com>
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * on the rights to use, copy, modify, merge, publish, distribute, sub
   8  * license, and/or sell copies of the Software, and to permit persons to whom
   9  * the Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  18  * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
  19  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  20  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  21  * USE OR OTHER DEALINGS IN THE SOFTWARE. */
  22
  23 #include "radeon_compiler.h"
  24
  25 #include "shader/prog_parameter.h"
  26 #include "shader/prog_print.h"
  27 #include "shader/prog_statevars.h"
  28
  29 #include "radeon_nqssadce.h"
  30 #include "radeon_program_alu.h"
  31 #include "r300_fragprog.h"
  32 #include "r300_fragprog_swizzle.h"
  33 #include "r500_fragprog.h"
  34
  35
  36 static void nqssadce_init(struct nqssadce_state* s)
  37 {
  38         s->Outputs[FRAG_RESULT_COLOR].Sourced = WRITEMASK_XYZW;
  39         s->Outputs[FRAG_RESULT_DEPTH].Sourced = WRITEMASK_W;
  40 }
  41
  42 /**
  43  * Transform the program to support fragment.position.
  44  *
  45  * Introduce a small fragment at the start of the program that will be
  46  * the only code that directly reads the FRAG_ATTRIB_WPOS input.
  47  * All other code pieces that reference that input will be rewritten
  48  * to read from a newly allocated temporary.
  49  *
  50  */
  51 static void insert_WPOS_trailer(struct r300_fragment_program_compiler *compiler)
  52 {
  53         int i;
  54
  55         if (!(compiler->Base.Program.InputsRead & FRAG_BIT_WPOS)) {
  56                 compiler->code->wpos_attr = FRAG_ATTRIB_MAX;
  57                 return;
  58         }
  59
  60         for (i = FRAG_ATTRIB_TEX0; i <= FRAG_ATTRIB_TEX7; ++i)
  61         {
  62                 if (!(compiler->Base.Program.InputsRead & (1 << i))) {
  63                         compiler->code->wpos_attr = i;
  64                         break;
  65                 }
  66         }
  67
  68         rc_transform_fragment_wpos(&compiler->Base, FRAG_ATTRIB_WPOS, compiler->code->wpos_attr);
  69 }
  70
  71 /**
  72  * Rewrite fragment.fogcoord to use a texture coordinate slot.
  73  * Note that fogcoord is forced into an X001 pattern, and this enforcement
  74  * is done here.
  75  *
  76  * See also the counterpart rewriting for vertex programs.
  77  */
  78 static void rewriteFog(struct r300_fragment_program_compiler *compiler)
  79 {
  80         struct rX00_fragment_program_code *code = compiler->code;
  81         struct prog_src_register src;
  82         int i;
  83
  84         if (!(compiler->Base.Program.InputsRead & FRAG_BIT_FOGC)) {
  85                 code->fog_attr = FRAG_ATTRIB_MAX;
  86                 return;
  87         }
  88
  89         for (i = FRAG_ATTRIB_TEX0; i <= FRAG_ATTRIB_TEX7; ++i)
  90         {
  91                 if (!(compiler->Base.Program.InputsRead & (1 << i))) {
  92                         code->fog_attr = i;
  93                         break;
  94                 }
  95         }
  96
  97         reset_srcreg(&src);
  98         src.File = PROGRAM_INPUT;
  99         src.Index = code->fog_attr;
 100         src.Swizzle = MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_ZERO, SWIZZLE_ZERO, SWIZZLE_ONE);
 101         rc_move_input(&compiler->Base, FRAG_ATTRIB_FOGC, src);
 102 }
 103
 104
 105 static void rewrite_depth_out(struct r300_fragment_program_compiler * c)
 106 {
 107         struct rc_instruction *rci;
 108
 109         for (rci = c->Base.Program.Instructions.Next; rci != &c->Base.Program.Instructions; rci = rci->Next) {
 110                 struct prog_instruction * inst = &rci->I;
 111
 112                 if (inst->DstReg.File != PROGRAM_OUTPUT || inst->DstReg.Index != FRAG_RESULT_DEPTH)
 113                         continue;
 114
 115                 if (inst->DstReg.WriteMask & WRITEMASK_Z) {
 116                         inst->DstReg.WriteMask = WRITEMASK_W;
 117                 } else {
 118                         inst->DstReg.WriteMask = 0;
 119                         continue;
 120                 }
 121
 122                 switch (inst->Opcode) {
 123                         case OPCODE_FRC:
 124                         case OPCODE_MOV:
 125                                 inst->SrcReg[0] = lmul_swizzle(SWIZZLE_ZZZZ, inst->SrcReg[0]);
 126                                 break;
 127                         case OPCODE_ADD:
 128                         case OPCODE_MAX:
 129                         case OPCODE_MIN:
 130                         case OPCODE_MUL:
 131                                 inst->SrcReg[0] = lmul_swizzle(SWIZZLE_ZZZZ, inst->SrcReg[0]);
 132                                 inst->SrcReg[1] = lmul_swizzle(SWIZZLE_ZZZZ, inst->SrcReg[1]);
 133                                 break;
 134                         case OPCODE_CMP:
 135                         case OPCODE_MAD:
 136                                 inst->SrcReg[0] = lmul_swizzle(SWIZZLE_ZZZZ, inst->SrcReg[0]);
 137                                 inst->SrcReg[1] = lmul_swizzle(SWIZZLE_ZZZZ, inst->SrcReg[1]);
 138                                 inst->SrcReg[2] = lmul_swizzle(SWIZZLE_ZZZZ, inst->SrcReg[2]);
 139                                 break;
 140                         default:
 141                                 // Scalar instructions needn't be reswizzled
 142                                 break;
 143                 }
 144         }
 145 }
 146
 147 void r3xx_compile_fragment_program(struct r300_fragment_program_compiler* c)
 148 {
 149         insert_WPOS_trailer(c);
 150
 151         rewriteFog(c);
 152
 153         rewrite_depth_out(c);
 154
 155         if (c->is_r500) {
 156                 struct radeon_program_transformation transformations[] = {
 157                         { &r500_transform_TEX, c },
 158                         { &radeonTransformALU, 0 },
 159                         { &radeonTransformDeriv, 0 },
 160                         { &radeonTransformTrigScale, 0 }
 161                 };
 162                 radeonLocalTransform(&c->Base, 4, transformations);
 163         } else {
 164                 struct radeon_program_transformation transformations[] = {
 165                         { &r300_transform_TEX, c },
 166                         { &radeonTransformALU, 0 },
 167                         { &radeonTransformTrigSimple, 0 }
 168                 };
 169                 radeonLocalTransform(&c->Base, 3, transformations);
 170         }
 171
 172         if (c->Base.Debug) {
 173                 _mesa_printf("Fragment Program: After native rewrite:\n");
 174                 rc_print_program(&c->Base.Program);
 175                 fflush(stdout);
 176         }
 177
 178         if (c->is_r500) {
 179                 struct radeon_nqssadce_descr nqssadce = {
 180                         .Init = &nqssadce_init,
 181                         .IsNativeSwizzle = &r500FPIsNativeSwizzle,
 182                         .BuildSwizzle = &r500FPBuildSwizzle
 183                 };
 184                 radeonNqssaDce(&c->Base, &nqssadce, 0);
 185         } else {
 186                 struct radeon_nqssadce_descr nqssadce = {
 187                         .Init = &nqssadce_init,
 188                         .IsNativeSwizzle = &r300FPIsNativeSwizzle,
 189                         .BuildSwizzle = &r300FPBuildSwizzle
 190                 };
 191                 radeonNqssaDce(&c->Base, &nqssadce, 0);
 192         }
 193
 194         if (c->Base.Debug) {
 195                 _mesa_printf("Compiler: after NqSSA-DCE:\n");
 196                 rc_print_program(&c->Base.Program);
 197                 fflush(stdout);
 198         }
 199
 200         if (c->is_r500) {
 201                 r500BuildFragmentProgramHwCode(c);
 202         } else {
 203                 r300BuildFragmentProgramHwCode(c);
 204         }
 205
 206         rc_constants_copy(&c->code->constants, &c->Base.Program.Constants);
 207
 208         if (c->Base.Debug) {
 209                 if (c->is_r500) {
 210                         r500FragmentProgramDump(c->code);
 211                 } else {
 212                         r300FragmentProgramDump(c->code);
 213                 }
 214         }
 215 }