src/mesa/shader/slang/slang_link.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.2
   4  *
   5  * Copyright (C) 2008  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 /**
  26  * \file slang_link.c
  27  * GLSL linker
  28  * \author Brian Paul
  29  */
  30
  31 #include "main/imports.h"
  32 #include "main/context.h"
  33 #include "main/hash.h"
  34 #include "main/macros.h"
  35 #include "shader/program.h"
  36 #include "shader/prog_instruction.h"
  37 #include "shader/prog_parameter.h"
  38 #include "shader/prog_print.h"
  39 #include "shader/prog_statevars.h"
  40 #include "shader/prog_uniform.h"
  41 #include "shader/shader_api.h"
  42 #include "slang_link.h"
  43
  44
  45 /** cast wrapper */
  46 static struct gl_vertex_program *
  47 vertex_program(struct gl_program *prog)
  48 {
  49    assert(prog->Target == GL_VERTEX_PROGRAM_ARB);
  50    return (struct gl_vertex_program *) prog;
  51 }
  52
  53
  54 /** cast wrapper */
  55 static struct gl_fragment_program *
  56 fragment_program(struct gl_program *prog)
  57 {
  58    assert(prog->Target == GL_FRAGMENT_PROGRAM_ARB);
  59    return (struct gl_fragment_program *) prog;
  60 }
  61
  62
  63 /**
  64  * Record a linking error.
  65  */
  66 static void
  67 link_error(struct gl_shader_program *shProg, const char *msg)
  68 {
  69    if (shProg->InfoLog) {
  70       _mesa_free(shProg->InfoLog);
  71    }
  72    shProg->InfoLog = _mesa_strdup(msg);
  73    shProg->LinkStatus = GL_FALSE;
  74 }
  75
  76
  77
  78 /**
  79  * Check if the given bit is either set or clear in both bitfields.
  80  */
  81 static GLboolean
  82 bits_agree(GLbitfield flags1, GLbitfield flags2, GLbitfield bit)
  83 {
  84    return (flags1 & bit) == (flags2 & bit);
  85 }
  86
  87
  88 /**
  89  * Linking varying vars involves rearranging varying vars so that the
  90  * vertex program's output varyings matches the order of the fragment
  91  * program's input varyings.
  92  * We'll then rewrite instructions to replace PROGRAM_VARYING with either
  93  * PROGRAM_INPUT or PROGRAM_OUTPUT depending on whether it's a vertex or
  94  * fragment shader.
  95  * This is also where we set program Input/OutputFlags to indicate
  96  * which inputs are centroid-sampled, invariant, etc.
  97  */
  98 static GLboolean
  99 link_varying_vars(struct gl_shader_program *shProg, struct gl_program *prog)
 100 {
 101    GLuint *map, i, firstVarying, newFile;
 102    GLbitfield *inOutFlags;
 103
 104    map = (GLuint *) malloc(prog->Varying->NumParameters * sizeof(GLuint));
 105    if (!map)
 106       return GL_FALSE;
 107
 108    /* Varying variables are treated like other vertex program outputs
 109     * (and like other fragment program inputs).  The position of the
 110     * first varying differs for vertex/fragment programs...
 111     * Also, replace File=PROGRAM_VARYING with File=PROGRAM_INPUT/OUTPUT.
 112     */
 113    if (prog->Target == GL_VERTEX_PROGRAM_ARB) {
 114       firstVarying = VERT_RESULT_VAR0;
 115       newFile = PROGRAM_OUTPUT;
 116       inOutFlags = prog->OutputFlags;
 117    }
 118    else {
 119       assert(prog->Target == GL_FRAGMENT_PROGRAM_ARB);
 120       firstVarying = FRAG_ATTRIB_VAR0;
 121       newFile = PROGRAM_INPUT;
 122       inOutFlags = prog->InputFlags;
 123    }
 124
 125    for (i = 0; i < prog->Varying->NumParameters; i++) {
 126       /* see if this varying is in the linked varying list */
 127       const struct gl_program_parameter *var = prog->Varying->Parameters + i;
 128       GLint j = _mesa_lookup_parameter_index(shProg->Varying, -1, var->Name);
 129       if (j >= 0) {
 130          /* varying is already in list, do some error checking */
 131          const struct gl_program_parameter *v =
 132             &shProg->Varying->Parameters[j];
 133          if (var->Size != v->Size) {
 134             link_error(shProg, "mismatched varying variable types");
 135             return GL_FALSE;
 136          }
 137          if (!bits_agree(var->Flags, v->Flags, PROG_PARAM_BIT_CENTROID)) {
 138             char msg[100];
 139             snprintf(msg, sizeof(msg),
 140                      "centroid modifier mismatch for '%s'", var->Name);
 141             link_error(shProg, msg);
 142             return GL_FALSE;
 143          }
 144          if (!bits_agree(var->Flags, v->Flags, PROG_PARAM_BIT_INVARIANT)) {
 145             char msg[100];
 146             snprintf(msg, sizeof(msg),
 147                      "invariant modifier mismatch for '%s'", var->Name);
 148             link_error(shProg, msg);
 149             return GL_FALSE;
 150          }
 151       }
 152       else {
 153          /* not already in linked list */
 154          j = _mesa_add_varying(shProg->Varying, var->Name, var->Size,
 155                                var->Flags);
 156       }
 157
 158       /* Map varying[i] to varying[j].
 159        * Plus, set prog->Input/OutputFlags[] as described above.
 160        * Note: the loop here takes care of arrays or large (sz>4) vars.
 161        */
 162       {
 163          GLint sz = var->Size;
 164          while (sz > 0) {
 165             inOutFlags[firstVarying + j] = var->Flags;
 166             /*printf("Link varying from %d to %d\n", i, j);*/
 167             map[i++] = j++;
 168             sz -= 4;
 169          }
 170          i--; /* go back one */
 171       }
 172    }
 173
 174
 175    /* OK, now scan the program/shader instructions looking for varying vars,
 176     * replacing the old index with the new index.
 177     */
 178    for (i = 0; i < prog->NumInstructions; i++) {
 179       struct prog_instruction *inst = prog->Instructions + i;
 180       GLuint j;
 181
 182       if (inst->DstReg.File == PROGRAM_VARYING) {
 183          inst->DstReg.File = newFile;
 184          inst->DstReg.Index = map[ inst->DstReg.Index ] + firstVarying;
 185       }
 186
 187       for (j = 0; j < 3; j++) {
 188          if (inst->SrcReg[j].File == PROGRAM_VARYING) {
 189             inst->SrcReg[j].File = newFile;
 190             inst->SrcReg[j].Index = map[ inst->SrcReg[j].Index ] + firstVarying;
 191          }
 192       }
 193    }
 194
 195    free(map);
 196
 197    /* these will get recomputed before linking is completed */
 198    prog->InputsRead = 0x0;
 199    prog->OutputsWritten = 0x0;
 200
 201    return GL_TRUE;
 202 }
 203
 204
 205 /**
 206  * Build the shProg->Uniforms list.
 207  * This is basically a list/index of all uniforms found in either/both of
 208  * the vertex and fragment shaders.
 209  */
 210 static GLboolean
 211 link_uniform_vars(struct gl_shader_program *shProg,
 212                   struct gl_program *prog,
 213                   GLuint *numSamplers)
 214 {
 215    GLuint samplerMap[MAX_SAMPLERS];
 216    GLuint i;
 217
 218    for (i = 0; i < prog->Parameters->NumParameters; i++) {
 219       const struct gl_program_parameter *p = prog->Parameters->Parameters + i;
 220
 221       /*
 222        * XXX FIX NEEDED HERE
 223        * We should also be adding a uniform if p->Type == PROGRAM_STATE_VAR.
 224        * For example, modelview matrix, light pos, etc.
 225        * Also, we need to update the state-var name-generator code to
 226        * generate GLSL-style names, like "gl_LightSource[0].position".
 227        * Furthermore, we'll need to fix the state-var's size/datatype info.
 228        */
 229
 230       if ((p->Type == PROGRAM_UNIFORM && p->Used) ||
 231           p->Type == PROGRAM_SAMPLER) {
 232          struct gl_uniform *uniform =
 233             _mesa_append_uniform(shProg->Uniforms, p->Name, prog->Target, i);
 234          if (uniform)
 235             uniform->Initialized = p->Initialized;
 236       }
 237
 238       if (p->Type == PROGRAM_SAMPLER) {
 239          /* Allocate a new sampler index */
 240          GLuint sampNum = *numSamplers;
 241          GLuint oldSampNum = (GLuint) prog->Parameters->ParameterValues[i][0];
 242          if (oldSampNum >= MAX_SAMPLERS) {
 243             link_error(shProg, "Too many texture samplers");
 244             return GL_FALSE;
 245          }
 246          samplerMap[oldSampNum] = sampNum;
 247          (*numSamplers)++;
 248       }
 249    }
 250
 251
 252    /* OK, now scan the program/shader instructions looking for sampler vars,
 253     * replacing the old index with the new index.
 254     */
 255    prog->SamplersUsed = 0x0;
 256    for (i = 0; i < prog->NumInstructions; i++) {
 257       struct prog_instruction *inst = prog->Instructions + i;
 258       if (_mesa_is_tex_instruction(inst->Opcode)) {
 259          /*
 260          printf("====== remap sampler from %d to %d\n",
 261                 inst->Sampler, map[ inst->Sampler ]);
 262          */
 263          /* here, texUnit is really samplerUnit */
 264          assert(inst->TexSrcUnit < MAX_SAMPLERS);
 265          inst->TexSrcUnit = samplerMap[inst->TexSrcUnit];
 266          prog->SamplerTargets[inst->TexSrcUnit] = inst->TexSrcTarget;
 267          prog->SamplersUsed |= (1 << inst->TexSrcUnit);
 268       }
 269    }
 270
 271    return GL_TRUE;
 272 }
 273
 274
 275 /**
 276  * Resolve binding of generic vertex attributes.
 277  * For example, if the vertex shader declared "attribute vec4 foobar" we'll
 278  * allocate a generic vertex attribute for "foobar" and plug that value into
 279  * the vertex program instructions.
 280  * But if the user called glBindAttributeLocation(), those bindings will
 281  * have priority.
 282  */
 283 static GLboolean
 284 _slang_resolve_attributes(struct gl_shader_program *shProg,
 285                           const struct gl_program *origProg,
 286                           struct gl_program *linkedProg)
 287 {
 288    GLint attribMap[MAX_VERTEX_ATTRIBS];
 289    GLuint i, j;
 290    GLbitfield usedAttributes;
 291
 292    assert(origProg != linkedProg);
 293    assert(origProg->Target == GL_VERTEX_PROGRAM_ARB);
 294    assert(linkedProg->Target == GL_VERTEX_PROGRAM_ARB);
 295
 296    if (!shProg->Attributes)
 297       shProg->Attributes = _mesa_new_parameter_list();
 298
 299    if (linkedProg->Attributes) {
 300       _mesa_free_parameter_list(linkedProg->Attributes);
 301    }
 302    linkedProg->Attributes = _mesa_new_parameter_list();
 303
 304
 305    /* Build a bitmask indicating which attribute indexes have been
 306     * explicitly bound by the user with glBindAttributeLocation().
 307     */
 308    usedAttributes = 0x0;
 309    for (i = 0; i < shProg->Attributes->NumParameters; i++) {
 310       GLint attr = shProg->Attributes->Parameters[i].StateIndexes[0];
 311       usedAttributes |= (1 << attr);
 312    }
 313
 314    /* initialize the generic attribute map entries to -1 */
 315    for (i = 0; i < MAX_VERTEX_ATTRIBS; i++) {
 316       attribMap[i] = -1;
 317    }
 318
 319    /*
 320     * Scan program for generic attribute references
 321     */
 322    for (i = 0; i < linkedProg->NumInstructions; i++) {
 323       struct prog_instruction *inst = linkedProg->Instructions + i;
 324       for (j = 0; j < 3; j++) {
 325          if (inst->SrcReg[j].File == PROGRAM_INPUT &&
 326              inst->SrcReg[j].Index >= VERT_ATTRIB_GENERIC0) {
 327             /*
 328              * OK, we've found a generic vertex attribute reference.
 329              */
 330             const GLint k = inst->SrcReg[j].Index - VERT_ATTRIB_GENERIC0;
 331
 332             GLint attr = attribMap[k];
 333
 334             if (attr < 0) {
 335                /* Need to figure out attribute mapping now.
 336                 */
 337                const char *name = origProg->Attributes->Parameters[k].Name;
 338                const GLint size = origProg->Attributes->Parameters[k].Size;
 339                const GLenum type =origProg->Attributes->Parameters[k].DataType;
 340                GLint index;
 341
 342                /* See if there's a user-defined attribute binding for
 343                 * this name.
 344                 */
 345                index = _mesa_lookup_parameter_index(shProg->Attributes,
 346                                                     -1, name);
 347                if (index >= 0) {
 348                   /* Found a user-defined binding */
 349                   attr = shProg->Attributes->Parameters[index].StateIndexes[0];
 350                }
 351                else {
 352                   /* No user-defined binding, choose our own attribute number.
 353                    * Start at 1 since generic attribute 0 always aliases
 354                    * glVertex/position.
 355                    */
 356                   for (attr = 1; attr < MAX_VERTEX_ATTRIBS; attr++) {
 357                      if (((1 << attr) & usedAttributes) == 0)
 358                         break;
 359                   }
 360                   if (attr == MAX_VERTEX_ATTRIBS) {
 361                      link_error(shProg, "Too many vertex attributes");
 362                      return GL_FALSE;
 363                   }
 364
 365                   /* mark this attribute as used */
 366                   usedAttributes |= (1 << attr);
 367                }
 368
 369                attribMap[k] = attr;
 370
 371                /* Save the final name->attrib binding so it can be queried
 372                 * with glGetAttributeLocation().
 373                 */
 374                _mesa_add_attribute(linkedProg->Attributes, name,
 375                                    size, type, attr);
 376             }
 377
 378             assert(attr >= 0);
 379
 380             /* update the instruction's src reg */
 381             inst->SrcReg[j].Index = VERT_ATTRIB_GENERIC0 + attr;
 382          }
 383       }
 384    }
 385
 386    return GL_TRUE;
 387 }
 388
 389
 390 /**
 391  * Scan program instructions to update the program's NumTemporaries field.
 392  * Note: this implemenation relies on the code generator allocating
 393  * temps in increasing order (0, 1, 2, ... ).
 394  */
 395 static void
 396 _slang_count_temporaries(struct gl_program *prog)
 397 {
 398    GLuint i, j;
 399    GLint maxIndex = -1;
 400
 401    for (i = 0; i < prog->NumInstructions; i++) {
 402       const struct prog_instruction *inst = prog->Instructions + i;
 403       const GLuint numSrc = _mesa_num_inst_src_regs(inst->Opcode);
 404       for (j = 0; j < numSrc; j++) {
 405          if (inst->SrcReg[j].File == PROGRAM_TEMPORARY) {
 406             if (maxIndex < inst->SrcReg[j].Index)
 407                maxIndex = inst->SrcReg[j].Index;
 408          }
 409          if (inst->DstReg.File == PROGRAM_TEMPORARY) {
 410             if (maxIndex < (GLint) inst->DstReg.Index)
 411                maxIndex = inst->DstReg.Index;
 412          }
 413       }
 414    }
 415
 416    prog->NumTemporaries = (GLuint) (maxIndex + 1);
 417 }
 418
 419
 420 /**
 421  * Scan program instructions to update the program's InputsRead and
 422  * OutputsWritten fields.
 423  */
 424 static void
 425 _slang_update_inputs_outputs(struct gl_program *prog)
 426 {
 427    GLuint i, j;
 428    GLuint maxAddrReg = 0;
 429
 430    prog->InputsRead = 0x0;
 431    prog->OutputsWritten = 0x0;
 432
 433    for (i = 0; i < prog->NumInstructions; i++) {
 434       const struct prog_instruction *inst = prog->Instructions + i;
 435       const GLuint numSrc = _mesa_num_inst_src_regs(inst->Opcode);
 436       for (j = 0; j < numSrc; j++) {
 437          if (inst->SrcReg[j].File == PROGRAM_INPUT) {
 438             prog->InputsRead |= 1 << inst->SrcReg[j].Index;
 439             if (prog->Target == GL_FRAGMENT_PROGRAM_ARB &&
 440                 inst->SrcReg[j].Index == FRAG_ATTRIB_FOGC) {
 441                /* The fragment shader FOGC input is used for fog,
 442                 * front-facing and sprite/point coord.
 443                 */
 444                struct gl_fragment_program *fp = fragment_program(prog);
 445                const GLint swz = GET_SWZ(inst->SrcReg[j].Swizzle, 0);
 446                if (swz == SWIZZLE_X)
 447                   fp->UsesFogFragCoord = GL_TRUE;
 448                else if (swz == SWIZZLE_Y)
 449                   fp->UsesFrontFacing = GL_TRUE;
 450                else if (swz == SWIZZLE_Z || swz == SWIZZLE_W)
 451                   fp->UsesPointCoord = GL_TRUE;
 452             }
 453          }
 454          else if (inst->SrcReg[j].File == PROGRAM_ADDRESS) {
 455             maxAddrReg = MAX2(maxAddrReg, (GLuint) (inst->SrcReg[j].Index + 1));
 456          }
 457       }
 458       if (inst->DstReg.File == PROGRAM_OUTPUT) {
 459          prog->OutputsWritten |= 1 << inst->DstReg.Index;
 460       }
 461       else if (inst->DstReg.File == PROGRAM_ADDRESS) {
 462          maxAddrReg = MAX2(maxAddrReg, inst->DstReg.Index + 1);
 463       }
 464    }
 465
 466    prog->NumAddressRegs = maxAddrReg;
 467 }
 468
 469
 470 /**
 471  * Shader linker.  Currently:
 472  *
 473  * 1. The last attached vertex shader and fragment shader are linked.
 474  * 2. Varying vars in the two shaders are combined so their locations
 475  *    agree between the vertex and fragment stages.  They're treated as
 476  *    vertex program output attribs and as fragment program input attribs.
 477  * 3. The vertex and fragment programs are cloned and modified to update
 478  *    src/dst register references so they use the new, linked varying
 479  *    storage locations.
 480  */
 481 void
 482 _slang_link(GLcontext *ctx,
 483             GLhandleARB programObj,
 484             struct gl_shader_program *shProg)
 485 {
 486    const struct gl_vertex_program *vertProg;
 487    const struct gl_fragment_program *fragProg;
 488    GLuint numSamplers = 0;
 489    GLuint i;
 490
 491    _mesa_clear_shader_program_data(ctx, shProg);
 492
 493    /* check that all programs compiled successfully */
 494    for (i = 0; i < shProg->NumShaders; i++) {
 495       if (!shProg->Shaders[i]->CompileStatus) {
 496          link_error(shProg, "linking with uncompiled shader\n");
 497          return;
 498       }
 499    }
 500
 501    shProg->Uniforms = _mesa_new_uniform_list();
 502    shProg->Varying = _mesa_new_parameter_list();
 503
 504    /**
 505     * Find attached vertex, fragment shaders defining main()
 506     */
 507    vertProg = NULL;
 508    fragProg = NULL;
 509    for (i = 0; i < shProg->NumShaders; i++) {
 510       struct gl_shader *shader = shProg->Shaders[i];
 511       if (shader->Type == GL_VERTEX_SHADER) {
 512          if (shader->Main)
 513             vertProg = vertex_program(shader->Program);
 514       }
 515       else if (shader->Type == GL_FRAGMENT_SHADER) {
 516          if (shader->Main)
 517             fragProg = fragment_program(shader->Program);
 518       }
 519       else {
 520          _mesa_problem(ctx, "unexpected shader target in slang_link()");
 521       }
 522    }
 523
 524 #if FEATURE_es2_glsl
 525    /* must have both a vertex and fragment program for ES2 */
 526    if (!vertProg) {
 527       link_error(shProg, "missing vertex shader\n");
 528       return;
 529    }
 530    if (!fragProg) {
 531       link_error(shProg, "missing fragment shader\n");
 532       return;
 533    }
 534 #endif
 535
 536    /*
 537     * Make copies of the vertex/fragment programs now since we'll be
 538     * changing src/dst registers after merging the uniforms and varying vars.
 539     */
 540    _mesa_reference_vertprog(ctx, &shProg->VertexProgram, NULL);
 541    if (vertProg) {
 542       struct gl_vertex_program *linked_vprog =
 543          vertex_program(_mesa_clone_program(ctx, &vertProg->Base));
 544       shProg->VertexProgram = linked_vprog; /* refcount OK */
 545       ASSERT(shProg->VertexProgram->Base.RefCount == 1);
 546    }
 547
 548    _mesa_reference_fragprog(ctx, &shProg->FragmentProgram, NULL);
 549    if (fragProg) {
 550       struct gl_fragment_program *linked_fprog =
 551          fragment_program(_mesa_clone_program(ctx, &fragProg->Base));
 552       shProg->FragmentProgram = linked_fprog; /* refcount OK */
 553       ASSERT(shProg->FragmentProgram->Base.RefCount == 1);
 554    }
 555
 556    /* link varying vars */
 557    if (shProg->VertexProgram) {
 558       if (!link_varying_vars(shProg, &shProg->VertexProgram->Base))
 559          return;
 560    }
 561    if (shProg->FragmentProgram) {
 562       if (!link_varying_vars(shProg, &shProg->FragmentProgram->Base))
 563          return;
 564    }
 565
 566    /* link uniform vars */
 567    if (shProg->VertexProgram) {
 568       if (!link_uniform_vars(shProg, &shProg->VertexProgram->Base,
 569                              &numSamplers)) {
 570          return;
 571       }
 572    }
 573    if (shProg->FragmentProgram) {
 574       if (!link_uniform_vars(shProg, &shProg->FragmentProgram->Base,
 575                              &numSamplers)) {
 576          return;
 577       }
 578    }
 579
 580    /*_mesa_print_uniforms(shProg->Uniforms);*/
 581
 582    if (shProg->VertexProgram) {
 583       if (!_slang_resolve_attributes(shProg, &vertProg->Base,
 584                                      &shProg->VertexProgram->Base)) {
 585          return;
 586       }
 587    }
 588
 589    if (shProg->VertexProgram) {
 590       _slang_update_inputs_outputs(&shProg->VertexProgram->Base);
 591       _slang_count_temporaries(&shProg->VertexProgram->Base);
 592       if (!(shProg->VertexProgram->Base.OutputsWritten & (1 << VERT_RESULT_HPOS))) {
 593          /* the vertex program did not compute a vertex position */
 594          link_error(shProg,
 595                     "gl_Position was not written by vertex shader\n");
 596          return;
 597       }
 598    }
 599    if (shProg->FragmentProgram) {
 600       _slang_count_temporaries(&shProg->FragmentProgram->Base);
 601       _slang_update_inputs_outputs(&shProg->FragmentProgram->Base);
 602    }
 603
 604    /* Check that all the varying vars needed by the fragment shader are
 605     * actually produced by the vertex shader.
 606     */
 607    if (shProg->FragmentProgram) {
 608       const GLbitfield varyingRead
 609          = shProg->FragmentProgram->Base.InputsRead >> FRAG_ATTRIB_VAR0;
 610       const GLbitfield varyingWritten = shProg->VertexProgram ?
 611          shProg->VertexProgram->Base.OutputsWritten >> VERT_RESULT_VAR0 : 0x0;
 612       if ((varyingRead & varyingWritten) != varyingRead) {
 613          link_error(shProg,
 614           "Fragment program using varying vars not written by vertex shader\n");
 615          return;
 616       }
 617    }
 618
 619
 620    if (fragProg && shProg->FragmentProgram) {
 621       /* Compute initial program's TexturesUsed info */
 622       _mesa_update_shader_textures_used(&shProg->FragmentProgram->Base);
 623
 624       /* notify driver that a new fragment program has been compiled/linked */
 625       ctx->Driver.ProgramStringNotify(ctx, GL_FRAGMENT_PROGRAM_ARB,
 626                                       &shProg->FragmentProgram->Base);
 627       if (MESA_VERBOSE & VERBOSE_GLSL_DUMP) {
 628          printf("Mesa original fragment program:\n");
 629          _mesa_print_program(&fragProg->Base);
 630          _mesa_print_program_parameters(ctx, &fragProg->Base);
 631
 632          printf("Mesa post-link fragment program:\n");
 633          _mesa_print_program(&shProg->FragmentProgram->Base);
 634          _mesa_print_program_parameters(ctx, &shProg->FragmentProgram->Base);
 635       }
 636    }
 637
 638    if (vertProg && shProg->VertexProgram) {
 639       /* Compute initial program's TexturesUsed info */
 640       _mesa_update_shader_textures_used(&shProg->VertexProgram->Base);
 641
 642       /* notify driver that a new vertex program has been compiled/linked */
 643       ctx->Driver.ProgramStringNotify(ctx, GL_VERTEX_PROGRAM_ARB,
 644                                       &shProg->VertexProgram->Base);
 645       if (MESA_VERBOSE & VERBOSE_GLSL_DUMP) {
 646          printf("Mesa original vertex program:\n");
 647          _mesa_print_program(&vertProg->Base);
 648          _mesa_print_program_parameters(ctx, &vertProg->Base);
 649
 650          printf("Mesa post-link vertex program:\n");
 651          _mesa_print_program(&shProg->VertexProgram->Base);
 652          _mesa_print_program_parameters(ctx, &shProg->VertexProgram->Base);
 653       }
 654    }
 655
 656    if (MESA_VERBOSE & VERBOSE_GLSL_DUMP) {
 657       printf("Varying vars:\n");
 658       _mesa_print_parameter_list(shProg->Varying);
 659    }
 660
 661    shProg->LinkStatus = (shProg->VertexProgram || shProg->FragmentProgram);
 662 }
 663