src/mesa/state_tracker/st_program.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * 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, sub license, 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 portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27  /*
  28   * Authors:
  29   *   Keith Whitwell <keith@tungstengraphics.com>
  30   *   Brian Paul
  31   */
  32
  33
  34 #include "main/imports.h"
  35 #include "main/mtypes.h"
  36 #include "shader/prog_print.h"
  37 #include "shader/programopt.h"
  38
  39 #include "pipe/p_context.h"
  40 #include "pipe/p_defines.h"
  41 #include "pipe/p_shader_tokens.h"
  42 #include "draw/draw_context.h"
  43 #include "tgsi/tgsi_dump.h"
  44
  45 #include "st_context.h"
  46 #include "st_atom.h"
  47 #include "st_program.h"
  48 #include "st_mesa_to_tgsi.h"
  49 #include "cso_cache/cso_context.h"
  50
  51
  52 #define ST_MAX_SHADER_TOKENS (8 * 1024)
  53
  54
  55 #define TGSI_DEBUG 0
  56
  57
  58 /**
  59  * Translate a Mesa vertex shader into a TGSI shader.
  60  * \param outputMapping  to map vertex program output registers (VERT_RESULT_x)
  61  *       to TGSI output slots
  62  * \param tokensOut  destination for TGSI tokens
  63  * \return  pointer to cached pipe_shader object.
  64  */
  65 void
  66 st_translate_vertex_program(struct st_context *st,
  67                             struct st_vertex_program *stvp,
  68                             const GLuint outputMapping[],
  69                             const ubyte *outputSemanticName,
  70                             const ubyte *outputSemanticIndex)
  71 {
  72    struct pipe_context *pipe = st->pipe;
  73    struct tgsi_token *tokens;
  74    GLuint defaultOutputMapping[VERT_RESULT_MAX];
  75    struct pipe_shader_state vs;
  76    GLuint attr, i;
  77    GLuint num_generic = 0;
  78    GLuint num_tokens;
  79
  80    ubyte vs_input_semantic_name[PIPE_MAX_SHADER_INPUTS];
  81    ubyte vs_input_semantic_index[PIPE_MAX_SHADER_INPUTS];
  82    uint vs_num_inputs = 0;
  83
  84    ubyte vs_output_semantic_name[PIPE_MAX_SHADER_OUTPUTS];
  85    ubyte vs_output_semantic_index[PIPE_MAX_SHADER_OUTPUTS];
  86    uint vs_num_outputs = 0;
  87
  88    GLbitfield input_flags[MAX_PROGRAM_INPUTS];
  89    GLbitfield output_flags[MAX_PROGRAM_OUTPUTS];
  90
  91    tokens =  (struct tgsi_token *)MALLOC(ST_MAX_SHADER_TOKENS * sizeof *tokens);
  92    if(!tokens) {
  93       /* FIXME: propagate error to the caller */
  94       assert(0);
  95       return;
  96    }
  97
  98    memset(&vs, 0, sizeof(vs));
  99    memset(input_flags, 0, sizeof(input_flags));
 100    memset(output_flags, 0, sizeof(output_flags));
 101
 102    if (stvp->Base.IsPositionInvariant)
 103       _mesa_insert_mvp_code(st->ctx, &stvp->Base);
 104
 105    /*
 106     * Determine number of inputs, the mappings between VERT_ATTRIB_x
 107     * and TGSI generic input indexes, plus input attrib semantic info.
 108     */
 109    for (attr = 0; attr < VERT_ATTRIB_MAX; attr++) {
 110       if (stvp->Base.Base.InputsRead & (1 << attr)) {
 111          const GLuint slot = vs_num_inputs;
 112
 113          vs_num_inputs++;
 114
 115          stvp->input_to_index[attr] = slot;
 116          stvp->index_to_input[slot] = attr;
 117
 118          switch (attr) {
 119          case VERT_ATTRIB_POS:
 120             vs_input_semantic_name[slot] = TGSI_SEMANTIC_POSITION;
 121             vs_input_semantic_index[slot] = 0;
 122             break;
 123          case VERT_ATTRIB_WEIGHT:
 124             /* fall-through */
 125          case VERT_ATTRIB_NORMAL:
 126             /* just label as a generic */
 127             vs_input_semantic_name[slot] = TGSI_SEMANTIC_GENERIC;
 128             vs_input_semantic_index[slot] = 0;
 129             break;
 130          case VERT_ATTRIB_COLOR0:
 131             vs_input_semantic_name[slot] = TGSI_SEMANTIC_COLOR;
 132             vs_input_semantic_index[slot] = 0;
 133             break;
 134          case VERT_ATTRIB_COLOR1:
 135             vs_input_semantic_name[slot] = TGSI_SEMANTIC_COLOR;
 136             vs_input_semantic_index[slot] = 1;
 137             break;
 138          case VERT_ATTRIB_FOG:
 139             vs_input_semantic_name[slot] = TGSI_SEMANTIC_FOG;
 140             vs_input_semantic_index[slot] = 0;
 141             break;
 142          case VERT_ATTRIB_POINT_SIZE:
 143             vs_input_semantic_name[slot] = TGSI_SEMANTIC_PSIZE;
 144             vs_input_semantic_index[slot] = 0;
 145             break;
 146          case VERT_ATTRIB_TEX0:
 147          case VERT_ATTRIB_TEX1:
 148          case VERT_ATTRIB_TEX2:
 149          case VERT_ATTRIB_TEX3:
 150          case VERT_ATTRIB_TEX4:
 151          case VERT_ATTRIB_TEX5:
 152          case VERT_ATTRIB_TEX6:
 153          case VERT_ATTRIB_TEX7:
 154             vs_input_semantic_name[slot] = TGSI_SEMANTIC_GENERIC;
 155             vs_input_semantic_index[slot] = num_generic++;
 156             break;
 157          case VERT_ATTRIB_GENERIC0:
 158          case VERT_ATTRIB_GENERIC1:
 159          case VERT_ATTRIB_GENERIC2:
 160          case VERT_ATTRIB_GENERIC3:
 161          case VERT_ATTRIB_GENERIC4:
 162          case VERT_ATTRIB_GENERIC5:
 163          case VERT_ATTRIB_GENERIC6:
 164          case VERT_ATTRIB_GENERIC7:
 165          case VERT_ATTRIB_GENERIC8:
 166          case VERT_ATTRIB_GENERIC9:
 167          case VERT_ATTRIB_GENERIC10:
 168          case VERT_ATTRIB_GENERIC11:
 169          case VERT_ATTRIB_GENERIC12:
 170          case VERT_ATTRIB_GENERIC13:
 171          case VERT_ATTRIB_GENERIC14:
 172          case VERT_ATTRIB_GENERIC15:
 173             assert(attr < VERT_ATTRIB_MAX);
 174             vs_input_semantic_name[slot] = TGSI_SEMANTIC_GENERIC;
 175             vs_input_semantic_index[slot] = num_generic++;
 176             break;
 177          default:
 178             assert(0);
 179          }
 180
 181          input_flags[slot] = stvp->Base.Base.InputFlags[attr];
 182       }
 183    }
 184
 185 #if 0
 186    if (outputMapping && outputSemanticName) {
 187       printf("VERT_RESULT  written  out_slot  semantic_name  semantic_index\n");
 188       for (attr = 0; attr < VERT_RESULT_MAX; attr++) {
 189          printf("    %-2d          %c       %3d          %2d              %2d\n",
 190                 attr,
 191                 ((stvp->Base.Base.OutputsWritten & (1 << attr)) ? 'Y' : ' '),
 192                 outputMapping[attr],
 193                 outputSemanticName[attr],
 194                 outputSemanticIndex[attr]);
 195       }
 196    }
 197 #endif
 198
 199    /* initialize output semantics to defaults */
 200    for (i = 0; i < PIPE_MAX_SHADER_OUTPUTS; i++) {
 201       vs_output_semantic_name[i] = TGSI_SEMANTIC_GENERIC;
 202       vs_output_semantic_index[i] = 0;
 203       output_flags[i] = 0x0;
 204    }
 205
 206    num_generic = 0;
 207    /*
 208     * Determine number of outputs, the (default) output register
 209     * mapping and the semantic information for each output.
 210     */
 211    for (attr = 0; attr < VERT_RESULT_MAX; attr++) {
 212       if (stvp->Base.Base.OutputsWritten & (1 << attr)) {
 213          GLuint slot;
 214
 215          /* XXX
 216           * Pass in the fragment program's input's semantic info.
 217           * Use the generic semantic indexes from there, instead of
 218           * guessing below.
 219           */
 220
 221          if (outputMapping) {
 222             slot = outputMapping[attr];
 223             assert(slot != ~0);
 224          }
 225          else {
 226             slot = vs_num_outputs;
 227             vs_num_outputs++;
 228             defaultOutputMapping[attr] = slot;
 229          }
 230
 231          switch (attr) {
 232          case VERT_RESULT_HPOS:
 233             assert(slot == 0);
 234             vs_output_semantic_name[slot] = TGSI_SEMANTIC_POSITION;
 235             vs_output_semantic_index[slot] = 0;
 236             break;
 237          case VERT_RESULT_COL0:
 238             vs_output_semantic_name[slot] = TGSI_SEMANTIC_COLOR;
 239             vs_output_semantic_index[slot] = 0;
 240             break;
 241          case VERT_RESULT_COL1:
 242             vs_output_semantic_name[slot] = TGSI_SEMANTIC_COLOR;
 243             vs_output_semantic_index[slot] = 1;
 244             break;
 245          case VERT_RESULT_BFC0:
 246             vs_output_semantic_name[slot] = TGSI_SEMANTIC_BCOLOR;
 247             vs_output_semantic_index[slot] = 0;
 248             break;
 249          case VERT_RESULT_BFC1:
 250             vs_output_semantic_name[slot] = TGSI_SEMANTIC_BCOLOR;
 251             vs_output_semantic_index[slot] = 1;
 252             break;
 253          case VERT_RESULT_FOGC:
 254             vs_output_semantic_name[slot] = TGSI_SEMANTIC_FOG;
 255             vs_output_semantic_index[slot] = 0;
 256             break;
 257          case VERT_RESULT_PSIZ:
 258             vs_output_semantic_name[slot] = TGSI_SEMANTIC_PSIZE;
 259             vs_output_semantic_index[slot] = 0;
 260             break;
 261          case VERT_RESULT_EDGE:
 262             assert(0);
 263             break;
 264          case VERT_RESULT_TEX0:
 265          case VERT_RESULT_TEX1:
 266          case VERT_RESULT_TEX2:
 267          case VERT_RESULT_TEX3:
 268          case VERT_RESULT_TEX4:
 269          case VERT_RESULT_TEX5:
 270          case VERT_RESULT_TEX6:
 271          case VERT_RESULT_TEX7:
 272             /* fall-through */
 273          case VERT_RESULT_VAR0:
 274             /* fall-through */
 275          default:
 276             if (outputSemanticName) {
 277                /* use provided semantic into */
 278                assert(outputSemanticName[attr] != TGSI_SEMANTIC_COUNT);
 279                vs_output_semantic_name[slot] = outputSemanticName[attr];
 280                vs_output_semantic_index[slot] = outputSemanticIndex[attr];
 281             }
 282             else {
 283                /* use default semantic info */
 284                vs_output_semantic_name[slot] = TGSI_SEMANTIC_GENERIC;
 285                vs_output_semantic_index[slot] = num_generic++;
 286             }
 287          }
 288
 289          output_flags[slot] = stvp->Base.Base.OutputFlags[attr];
 290       }
 291    }
 292
 293    if (outputMapping) {
 294       /* find max output slot referenced to compute vs_num_outputs */
 295       GLuint maxSlot = 0;
 296       for (attr = 0; attr < VERT_RESULT_MAX; attr++) {
 297          if (outputMapping[attr] != ~0 && outputMapping[attr] > maxSlot)
 298             maxSlot = outputMapping[attr];
 299       }
 300       vs_num_outputs = maxSlot + 1;
 301    }
 302    else {
 303       outputMapping = defaultOutputMapping;
 304    }
 305
 306 #if 0 /* debug */
 307    {
 308       GLuint i;
 309       printf("outputMapping? %d\n", outputMapping ? 1 : 0);
 310       if (outputMapping) {
 311          printf("attr -> slot\n");
 312          for (i = 0; i < 16;  i++) {
 313             printf(" %2d       %3d\n", i, outputMapping[i]);
 314          }
 315       }
 316       printf("slot    sem_name  sem_index\n");
 317       for (i = 0; i < vs_num_outputs; i++) {
 318          printf(" %2d         %d         %d\n",
 319                 i,
 320                 vs_output_semantic_name[i],
 321                 vs_output_semantic_index[i]);
 322       }
 323    }
 324 #endif
 325
 326    /* free old shader state, if any */
 327    if (stvp->state.tokens) {
 328       _mesa_free((void *) stvp->state.tokens);
 329       stvp->state.tokens = NULL;
 330    }
 331    if (stvp->driver_shader) {
 332       cso_delete_vertex_shader(st->cso_context, stvp->driver_shader);
 333       stvp->driver_shader = NULL;
 334    }
 335
 336    /* XXX: fix static allocation of tokens:
 337     */
 338    num_tokens = st_translate_mesa_program(st->ctx,
 339                                           TGSI_PROCESSOR_VERTEX,
 340                                           &stvp->Base.Base,
 341                                           /* inputs */
 342                                           vs_num_inputs,
 343                                           stvp->input_to_index,
 344                                           vs_input_semantic_name,
 345                                           vs_input_semantic_index,
 346                                           NULL,
 347                                           input_flags,
 348                                           /* outputs */
 349                                           vs_num_outputs,
 350                                           outputMapping,
 351                                           vs_output_semantic_name,
 352                                           vs_output_semantic_index,
 353                                           output_flags,
 354                                           /* tokenized result */
 355                                           tokens, ST_MAX_SHADER_TOKENS);
 356
 357    assert(num_tokens < ST_MAX_SHADER_TOKENS);
 358
 359    vs.tokens = (struct tgsi_token *)
 360       _mesa_realloc(tokens,
 361                     ST_MAX_SHADER_TOKENS * sizeof *tokens,
 362                     num_tokens * sizeof *tokens);
 363
 364    stvp->num_inputs = vs_num_inputs;
 365    stvp->state = vs; /* struct copy */
 366    stvp->driver_shader = pipe->create_vs_state(pipe, &vs);
 367
 368    if (0)
 369       _mesa_print_program(&stvp->Base.Base);
 370
 371    if (TGSI_DEBUG)
 372       tgsi_dump( vs.tokens, 0 );
 373 }
 374
 375
 376
 377 /**
 378  * Translate a Mesa fragment shader into a TGSI shader.
 379  * \param inputMapping  to map fragment program input registers to TGSI
 380  *                      input slots
 381  * \param tokensOut  destination for TGSI tokens
 382  * \return  pointer to cached pipe_shader object.
 383  */
 384 void
 385 st_translate_fragment_program(struct st_context *st,
 386                               struct st_fragment_program *stfp,
 387                               const GLuint inputMapping[])
 388 {
 389    struct pipe_context *pipe = st->pipe;
 390    struct tgsi_token *tokens;
 391    GLuint outputMapping[FRAG_RESULT_MAX];
 392    GLuint defaultInputMapping[FRAG_ATTRIB_MAX];
 393    struct pipe_shader_state fs;
 394    GLuint interpMode[16];  /* XXX size? */
 395    GLuint attr;
 396    const GLbitfield inputsRead = stfp->Base.Base.InputsRead;
 397    GLuint vslot = 0;
 398    GLuint num_generic = 0;
 399    GLuint num_tokens;
 400
 401    uint fs_num_inputs = 0;
 402
 403    ubyte fs_output_semantic_name[PIPE_MAX_SHADER_OUTPUTS];
 404    ubyte fs_output_semantic_index[PIPE_MAX_SHADER_OUTPUTS];
 405    uint fs_num_outputs = 0;
 406
 407    GLbitfield input_flags[MAX_PROGRAM_INPUTS];
 408    GLbitfield output_flags[MAX_PROGRAM_OUTPUTS];
 409
 410    tokens =  (struct tgsi_token *)MALLOC(ST_MAX_SHADER_TOKENS * sizeof *tokens);
 411    if(!tokens) {
 412       /* FIXME: propagate error to the caller */
 413       assert(0);
 414       return;
 415    }
 416
 417    memset(&fs, 0, sizeof(fs));
 418    memset(input_flags, 0, sizeof(input_flags));
 419    memset(output_flags, 0, sizeof(output_flags));
 420
 421    /* which vertex output goes to the first fragment input: */
 422    if (inputsRead & FRAG_BIT_WPOS)
 423       vslot = 0;
 424    else
 425       vslot = 1;
 426
 427    /*
 428     * Convert Mesa program inputs to TGSI input register semantics.
 429     */
 430    for (attr = 0; attr < FRAG_ATTRIB_MAX; attr++) {
 431       if (inputsRead & (1 << attr)) {
 432          const GLuint slot = fs_num_inputs;
 433
 434          defaultInputMapping[attr] = slot;
 435
 436          stfp->input_map[slot] = vslot++;
 437
 438          fs_num_inputs++;
 439
 440          switch (attr) {
 441          case FRAG_ATTRIB_WPOS:
 442             stfp->input_semantic_name[slot] = TGSI_SEMANTIC_POSITION;
 443             stfp->input_semantic_index[slot] = 0;
 444             interpMode[slot] = TGSI_INTERPOLATE_LINEAR;
 445             break;
 446          case FRAG_ATTRIB_COL0:
 447             stfp->input_semantic_name[slot] = TGSI_SEMANTIC_COLOR;
 448             stfp->input_semantic_index[slot] = 0;
 449             interpMode[slot] = TGSI_INTERPOLATE_LINEAR;
 450             break;
 451          case FRAG_ATTRIB_COL1:
 452             stfp->input_semantic_name[slot] = TGSI_SEMANTIC_COLOR;
 453             stfp->input_semantic_index[slot] = 1;
 454             interpMode[slot] = TGSI_INTERPOLATE_LINEAR;
 455             break;
 456          case FRAG_ATTRIB_FOGC:
 457             if (stfp->Base.UsesPointCoord) {
 458                stfp->input_semantic_name[slot] = TGSI_SEMANTIC_GENERIC;
 459                stfp->input_semantic_index[slot] = num_generic++;
 460             } else {
 461                stfp->input_semantic_name[slot] = TGSI_SEMANTIC_FOG;
 462                stfp->input_semantic_index[slot] = 0;
 463             }
 464             interpMode[slot] = TGSI_INTERPOLATE_PERSPECTIVE;
 465             break;
 466          case FRAG_ATTRIB_TEX0:
 467          case FRAG_ATTRIB_TEX1:
 468          case FRAG_ATTRIB_TEX2:
 469          case FRAG_ATTRIB_TEX3:
 470          case FRAG_ATTRIB_TEX4:
 471          case FRAG_ATTRIB_TEX5:
 472          case FRAG_ATTRIB_TEX6:
 473          case FRAG_ATTRIB_TEX7:
 474             stfp->input_semantic_name[slot] = TGSI_SEMANTIC_GENERIC;
 475             stfp->input_semantic_index[slot] = num_generic++;
 476             interpMode[slot] = TGSI_INTERPOLATE_PERSPECTIVE;
 477             break;
 478          case FRAG_ATTRIB_VAR0:
 479             /* fall-through */
 480          default:
 481             stfp->input_semantic_name[slot] = TGSI_SEMANTIC_GENERIC;
 482             stfp->input_semantic_index[slot] = num_generic++;
 483             interpMode[slot] = TGSI_INTERPOLATE_PERSPECTIVE;
 484          }
 485
 486          input_flags[slot] = stfp->Base.Base.InputFlags[attr];
 487       }
 488    }
 489
 490    /*
 491     * Semantics and mapping for outputs
 492     */
 493    {
 494       uint numColors = 0;
 495       GLbitfield outputsWritten = stfp->Base.Base.OutputsWritten;
 496
 497       /* if z is written, emit that first */
 498       if (outputsWritten & (1 << FRAG_RESULT_DEPTH)) {
 499          fs_output_semantic_name[fs_num_outputs] = TGSI_SEMANTIC_POSITION;
 500          fs_output_semantic_index[fs_num_outputs] = 0;
 501          outputMapping[FRAG_RESULT_DEPTH] = fs_num_outputs;
 502          fs_num_outputs++;
 503          outputsWritten &= ~(1 << FRAG_RESULT_DEPTH);
 504       }
 505
 506       /* handle remaning outputs (color) */
 507       for (attr = 0; attr < FRAG_RESULT_MAX; attr++) {
 508          if (outputsWritten & (1 << attr)) {
 509             switch (attr) {
 510             case FRAG_RESULT_DEPTH:
 511                /* handled above */
 512                assert(0);
 513                break;
 514             default:
 515                assert(attr == FRAG_RESULT_COLOR ||
 516                       (FRAG_RESULT_DATA0 <= attr && attr < FRAG_RESULT_MAX));
 517                fs_output_semantic_name[fs_num_outputs] = TGSI_SEMANTIC_COLOR;
 518                fs_output_semantic_index[fs_num_outputs] = numColors;
 519                outputMapping[attr] = fs_num_outputs;
 520                numColors++;
 521                break;
 522             }
 523
 524             output_flags[fs_num_outputs] = stfp->Base.Base.OutputFlags[attr];
 525
 526             fs_num_outputs++;
 527          }
 528       }
 529    }
 530
 531    if (!inputMapping)
 532       inputMapping = defaultInputMapping;
 533
 534    /* XXX: fix static allocation of tokens:
 535     */
 536    num_tokens = st_translate_mesa_program(st->ctx,
 537                                           TGSI_PROCESSOR_FRAGMENT,
 538                                           &stfp->Base.Base,
 539                                           /* inputs */
 540                                           fs_num_inputs,
 541                                           inputMapping,
 542                                           stfp->input_semantic_name,
 543                                           stfp->input_semantic_index,
 544                                           interpMode,
 545                                           input_flags,
 546                                           /* outputs */
 547                                           fs_num_outputs,
 548                                           outputMapping,
 549                                           fs_output_semantic_name,
 550                                           fs_output_semantic_index,
 551                                           output_flags,
 552                                           /* tokenized result */
 553                                           tokens, ST_MAX_SHADER_TOKENS);
 554
 555    assert(num_tokens < ST_MAX_SHADER_TOKENS);
 556
 557    fs.tokens = (struct tgsi_token *)
 558       _mesa_realloc(tokens,
 559                     ST_MAX_SHADER_TOKENS * sizeof *tokens,
 560                     num_tokens * sizeof *tokens);
 561
 562    stfp->state = fs; /* struct copy */
 563    stfp->driver_shader = pipe->create_fs_state(pipe, &fs);
 564
 565    if (0)
 566       _mesa_print_program(&stfp->Base.Base);
 567
 568    if (TGSI_DEBUG)
 569       tgsi_dump( fs.tokens, 0/*TGSI_DUMP_VERBOSE*/ );
 570 }
 571
 572
 573 /**
 574  * Debug- print current shader text
 575  */
 576 void
 577 st_print_shaders(GLcontext *ctx)
 578 {
 579    struct gl_shader_program *shProg = ctx->Shader.CurrentProgram;
 580    if (shProg) {
 581       GLuint i;
 582       for (i = 0; i < shProg->NumShaders; i++) {
 583          printf("GLSL shader %u of %u:\n", i, shProg->NumShaders);
 584          printf("%s\n", shProg->Shaders[i]->Source);
 585       }
 586    }
 587 }