src/mesa/shader/slang/slang_link.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5.3
   4  *
   5  * Copyright (C) 2007  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
  46 /**
  47  * Linking varying vars involves rearranging varying vars so that the
  48  * vertex program's output varyings matches the order of the fragment
  49  * program's input varyings.
  50  */
  51 static GLboolean
  52 link_varying_vars(struct gl_shader_program *shProg, struct gl_program *prog)
  53 {
  54    GLuint *map, i, firstVarying, newFile;
  55    GLbitfield varsWritten, varsRead;
  56
  57    map = (GLuint *) malloc(prog->Varying->NumParameters * sizeof(GLuint));
  58    if (!map)
  59       return GL_FALSE;
  60
  61    for (i = 0; i < prog->Varying->NumParameters; i++) {
  62       /* see if this varying is in the linked varying list */
  63       const struct gl_program_parameter *var
  64          = prog->Varying->Parameters + i;
  65
  66       GLint j = _mesa_lookup_parameter_index(shProg->Varying, -1, var->Name);
  67       if (j >= 0) {
  68          /* already in list, check size */
  69          if (var->Size != shProg->Varying->Parameters[j].Size) {
  70             /* error */
  71             return GL_FALSE;
  72          }
  73       }
  74       else {
  75          /* not already in linked list */
  76          j = _mesa_add_varying(shProg->Varying, var->Name, var->Size);
  77       }
  78       ASSERT(j >= 0);
  79
  80       map[i] = j;
  81    }
  82
  83
  84    /* Varying variables are treated like other vertex program outputs
  85     * (and like other fragment program inputs).  The position of the
  86     * first varying differs for vertex/fragment programs...
  87     * Also, replace File=PROGRAM_VARYING with File=PROGRAM_INPUT/OUTPUT.
  88     */
  89    if (prog->Target == GL_VERTEX_PROGRAM_ARB) {
  90       firstVarying = VERT_RESULT_VAR0;
  91       newFile = PROGRAM_OUTPUT;
  92    }
  93    else {
  94       assert(prog->Target == GL_FRAGMENT_PROGRAM_ARB);
  95       firstVarying = FRAG_ATTRIB_VAR0;
  96       newFile = PROGRAM_INPUT;
  97    }
  98
  99    /* keep track of which varying vars we read and write */
 100    varsWritten = varsRead = 0x0;
 101
 102    /* OK, now scan the program/shader instructions looking for varying vars,
 103     * replacing the old index with the new index.
 104     */
 105    for (i = 0; i < prog->NumInstructions; i++) {
 106       struct prog_instruction *inst = prog->Instructions + i;
 107       GLuint j;
 108
 109       if (inst->DstReg.File == PROGRAM_VARYING) {
 110          inst->DstReg.File = newFile;
 111          inst->DstReg.Index = map[ inst->DstReg.Index ] + firstVarying;
 112          varsWritten |= (1 << inst->DstReg.Index);
 113       }
 114
 115       for (j = 0; j < 3; j++) {
 116          if (inst->SrcReg[j].File == PROGRAM_VARYING) {
 117             inst->SrcReg[j].File = newFile;
 118             inst->SrcReg[j].Index = map[ inst->SrcReg[j].Index ] + firstVarying;
 119             varsRead |= (1 << inst->SrcReg[j].Index);
 120          }
 121       }
 122    }
 123
 124    if (prog->Target == GL_VERTEX_PROGRAM_ARB) {
 125       prog->OutputsWritten |= varsWritten;
 126       /*printf("VERT OUTPUTS: 0x%x \n", varsWritten);*/
 127    }
 128    else {
 129       assert(prog->Target == GL_FRAGMENT_PROGRAM_ARB);
 130       prog->InputsRead |= varsRead;
 131       /*printf("FRAG INPUTS: 0x%x\n", varsRead);*/
 132    }
 133
 134    free(map);
 135
 136    return GL_TRUE;
 137 }
 138
 139
 140 /**
 141  * Build the shProg->Uniforms list.
 142  * This is basically a list/index of all uniforms found in either/both of
 143  * the vertex and fragment shaders.
 144  */
 145 static void
 146 link_uniform_vars(struct gl_shader_program *shProg,
 147                   struct gl_program *prog,
 148                   GLuint *numSamplers)
 149 {
 150    GLuint samplerMap[MAX_SAMPLERS];
 151    GLuint i;
 152
 153    for (i = 0; i < prog->Parameters->NumParameters; i++) {
 154       const struct gl_program_parameter *p = prog->Parameters->Parameters + i;
 155
 156       /*
 157        * XXX FIX NEEDED HERE
 158        * We should also be adding a uniform if p->Type == PROGRAM_STATE_VAR.
 159        * For example, modelview matrix, light pos, etc.
 160        * Also, we need to update the state-var name-generator code to
 161        * generate GLSL-style names, like "gl_LightSource[0].position".
 162        * Furthermore, we'll need to fix the state-var's size/datatype info.
 163        */
 164
 165       if (p->Type == PROGRAM_UNIFORM ||
 166           p->Type == PROGRAM_SAMPLER) {
 167          _mesa_append_uniform(shProg->Uniforms, p->Name, prog->Target, i);
 168       }
 169
 170       if (p->Type == PROGRAM_SAMPLER) {
 171          /* Allocate a new sampler index */
 172          GLuint sampNum = *numSamplers;
 173          GLuint oldSampNum = (GLuint) prog->Parameters->ParameterValues[i][0];
 174          assert(oldSampNum < MAX_SAMPLERS);
 175          samplerMap[oldSampNum] = sampNum;
 176          (*numSamplers)++;
 177       }
 178    }
 179
 180
 181    /* OK, now scan the program/shader instructions looking for sampler vars,
 182     * replacing the old index with the new index.
 183     */
 184    prog->SamplersUsed = 0x0;
 185    for (i = 0; i < prog->NumInstructions; i++) {
 186       struct prog_instruction *inst = prog->Instructions + i;
 187       if (_mesa_is_tex_instruction(inst->Opcode)) {
 188          /*
 189          printf("====== remap sampler from %d to %d\n",
 190                 inst->Sampler, map[ inst->Sampler ]);
 191          */
 192          /* here, texUnit is really samplerUnit */
 193          inst->TexSrcUnit = samplerMap[inst->TexSrcUnit];
 194          prog->SamplerTargets[inst->TexSrcUnit] = inst->TexSrcTarget;
 195          prog->SamplersUsed |= (1 << inst->TexSrcUnit);
 196       }
 197    }
 198
 199 }
 200
 201
 202 /**
 203  * Resolve binding of generic vertex attributes.
 204  * For example, if the vertex shader declared "attribute vec4 foobar" we'll
 205  * allocate a generic vertex attribute for "foobar" and plug that value into
 206  * the vertex program instructions.
 207  */
 208 static GLboolean
 209 _slang_resolve_attributes(struct gl_shader_program *shProg,
 210                           struct gl_program *prog)
 211 {
 212    GLuint i, j;
 213    GLbitfield usedAttributes;
 214
 215    assert(prog->Target == GL_VERTEX_PROGRAM_ARB);
 216
 217    if (!shProg->Attributes)
 218       shProg->Attributes = _mesa_new_parameter_list();
 219
 220    /* Build a bitmask indicating which attribute indexes have been
 221     * explicitly bound by the user with glBindAttributeLocation().
 222     */
 223    usedAttributes = 0x0;
 224    for (i = 0; i < shProg->Attributes->NumParameters; i++) {
 225       GLint attr = shProg->Attributes->Parameters[i].StateIndexes[0];
 226       usedAttributes |= attr;
 227    }
 228
 229    /*
 230     * Scan program for generic attribute references
 231     */
 232    for (i = 0; i < prog->NumInstructions; i++) {
 233       struct prog_instruction *inst = prog->Instructions + i;
 234       for (j = 0; j < 3; j++) {
 235          if (inst->SrcReg[j].File == PROGRAM_INPUT &&
 236              inst->SrcReg[j].Index >= VERT_ATTRIB_GENERIC0) {
 237             /* this is a generic attrib */
 238             const GLint k = inst->SrcReg[j].Index - VERT_ATTRIB_GENERIC0;
 239             const char *name = prog->Attributes->Parameters[k].Name;
 240             /* See if this attrib name is in the program's attribute list
 241              * (i.e. was bound by the user).
 242              */
 243             GLint index = _mesa_lookup_parameter_index(shProg->Attributes,
 244                                                           -1, name);
 245             GLint attr;
 246             if (index >= 0) {
 247                /* found, user must have specified a binding */
 248                attr = shProg->Attributes->Parameters[index].StateIndexes[0];
 249             }
 250             else {
 251                /* Not found, choose our own attribute number.
 252                 * Start at 1 since generic attribute 0 always aliases
 253                 * glVertex/position.
 254                 */
 255                GLint size = prog->Attributes->Parameters[k].Size;
 256                GLenum datatype = prog->Attributes->Parameters[k].DataType;
 257                for (attr = 1; attr < MAX_VERTEX_ATTRIBS; attr++) {
 258                   if (((1 << attr) & usedAttributes) == 0)
 259                      break;
 260                }
 261                if (attr == MAX_VERTEX_ATTRIBS) {
 262                   /* too many!  XXX record error log */
 263                   return GL_FALSE;
 264                }
 265                _mesa_add_attribute(shProg->Attributes, name, size, datatype,attr);
 266
 267                /* set the attribute as used */
 268                usedAttributes |= 1<<attr;
 269             }
 270
 271             inst->SrcReg[j].Index = VERT_ATTRIB_GENERIC0 + attr;
 272          }
 273       }
 274    }
 275    return GL_TRUE;
 276 }
 277
 278
 279 /**
 280  * Scan program instructions to update the program's InputsRead and
 281  * OutputsWritten fields.
 282  */
 283 static void
 284 _slang_update_inputs_outputs(struct gl_program *prog)
 285 {
 286    GLuint i, j;
 287
 288    prog->InputsRead = 0x0;
 289    prog->OutputsWritten = 0x0;
 290
 291    for (i = 0; i < prog->NumInstructions; i++) {
 292       const struct prog_instruction *inst = prog->Instructions + i;
 293       const GLuint numSrc = _mesa_num_inst_src_regs(inst->Opcode);
 294       for (j = 0; j < numSrc; j++) {
 295          if (inst->SrcReg[j].File == PROGRAM_INPUT) {
 296             prog->InputsRead |= 1 << inst->SrcReg[j].Index;
 297          }
 298       }
 299       if (inst->DstReg.File == PROGRAM_OUTPUT) {
 300          prog->OutputsWritten |= 1 << inst->DstReg.Index;
 301       }
 302    }
 303 }
 304
 305
 306 /**
 307  * Scan a vertex program looking for instances of
 308  * (PROGRAM_INPUT, VERT_ATTRIB_GENERIC0 + oldAttrib) and replace with
 309  * (PROGRAM_INPUT, VERT_ATTRIB_GENERIC0 + newAttrib).
 310  * This is used when the user calls glBindAttribLocation on an already linked
 311  * shader program.
 312  */
 313 void
 314 _slang_remap_attribute(struct gl_program *prog, GLuint oldAttrib, GLuint newAttrib)
 315 {
 316    GLuint i, j;
 317
 318    assert(prog->Target == GL_VERTEX_PROGRAM_ARB);
 319
 320    for (i = 0; i < prog->NumInstructions; i++) {
 321       struct prog_instruction *inst = prog->Instructions + i;
 322       for (j = 0; j < 3; j++) {
 323          if (inst->SrcReg[j].File == PROGRAM_INPUT) {
 324             if (inst->SrcReg[j].Index == VERT_ATTRIB_GENERIC0 + oldAttrib) {
 325                inst->SrcReg[j].Index = VERT_ATTRIB_GENERIC0 + newAttrib;
 326             }
 327          }
 328       }
 329    }
 330
 331    _slang_update_inputs_outputs(prog);
 332 }
 333
 334
 335
 336 /** cast wrapper */
 337 static struct gl_vertex_program *
 338 vertex_program(struct gl_program *prog)
 339 {
 340    assert(prog->Target == GL_VERTEX_PROGRAM_ARB);
 341    return (struct gl_vertex_program *) prog;
 342 }
 343
 344
 345 /** cast wrapper */
 346 static struct gl_fragment_program *
 347 fragment_program(struct gl_program *prog)
 348 {
 349    assert(prog->Target == GL_FRAGMENT_PROGRAM_ARB);
 350    return (struct gl_fragment_program *) prog;
 351 }
 352
 353
 354 /**
 355  * Record a linking error.
 356  */
 357 static void
 358 link_error(struct gl_shader_program *shProg, const char *msg)
 359 {
 360    if (shProg->InfoLog) {
 361       _mesa_free(shProg->InfoLog);
 362    }
 363    shProg->InfoLog = _mesa_strdup(msg);
 364    shProg->LinkStatus = GL_FALSE;
 365 }
 366
 367
 368
 369 /**
 370  * Shader linker.  Currently:
 371  *
 372  * 1. The last attached vertex shader and fragment shader are linked.
 373  * 2. Varying vars in the two shaders are combined so their locations
 374  *    agree between the vertex and fragment stages.  They're treated as
 375  *    vertex program output attribs and as fragment program input attribs.
 376  * 3. The vertex and fragment programs are cloned and modified to update
 377  *    src/dst register references so they use the new, linked varying
 378  *    storage locations.
 379  */
 380 void
 381 _slang_link(GLcontext *ctx,
 382             GLhandleARB programObj,
 383             struct gl_shader_program *shProg)
 384 {
 385    const struct gl_vertex_program *vertProg;
 386    const struct gl_fragment_program *fragProg;
 387    GLuint numSamplers = 0;
 388    GLuint i;
 389
 390    _mesa_clear_shader_program_data(ctx, shProg);
 391
 392    /* check that all programs compiled successfully */
 393    for (i = 0; i < shProg->NumShaders; i++) {
 394       if (!shProg->Shaders[i]->CompileStatus) {
 395          link_error(shProg, "linking with uncompiled shader\n");
 396          return;
 397       }
 398    }
 399
 400    shProg->Uniforms = _mesa_new_uniform_list();
 401    shProg->Varying = _mesa_new_parameter_list();
 402
 403    /**
 404     * Find attached vertex, fragment shaders defining main()
 405     */
 406    vertProg = NULL;
 407    fragProg = NULL;
 408    for (i = 0; i < shProg->NumShaders; i++) {
 409       struct gl_shader *shader = shProg->Shaders[i];
 410       if (shader->Type == GL_VERTEX_SHADER && shader->Main)
 411          vertProg = vertex_program(shader->Program);
 412       else if (shader->Type == GL_FRAGMENT_SHADER && shader->Main)
 413          fragProg = fragment_program(shader->Program);
 414       else
 415          _mesa_problem(ctx, "unexpected shader target in slang_link()");
 416    }
 417
 418    /*
 419     * Make copies of the vertex/fragment programs now since we'll be
 420     * changing src/dst registers after merging the uniforms and varying vars.
 421     */
 422    _mesa_reference_vertprog(ctx, &shProg->VertexProgram, NULL);
 423    if (vertProg) {
 424       struct gl_vertex_program *linked_vprog =
 425          vertex_program(_mesa_clone_program(ctx, &vertProg->Base));
 426       shProg->VertexProgram = linked_vprog; /* refcount OK */
 427       ASSERT(shProg->VertexProgram->Base.RefCount == 1);
 428    }
 429
 430    _mesa_reference_fragprog(ctx, &shProg->FragmentProgram, NULL);
 431    if (fragProg) {
 432       struct gl_fragment_program *linked_fprog =
 433          fragment_program(_mesa_clone_program(ctx, &fragProg->Base));
 434       shProg->FragmentProgram = linked_fprog; /* refcount OK */
 435       ASSERT(shProg->FragmentProgram->Base.RefCount == 1);
 436    }
 437
 438    /* link varying vars */
 439    if (shProg->VertexProgram)
 440       link_varying_vars(shProg, &shProg->VertexProgram->Base);
 441    if (shProg->FragmentProgram)
 442       link_varying_vars(shProg, &shProg->FragmentProgram->Base);
 443
 444    /* link uniform vars */
 445    if (shProg->VertexProgram)
 446       link_uniform_vars(shProg, &shProg->VertexProgram->Base, &numSamplers);
 447    if (shProg->FragmentProgram)
 448       link_uniform_vars(shProg, &shProg->FragmentProgram->Base, &numSamplers);
 449
 450    /*_mesa_print_uniforms(shProg->Uniforms);*/
 451
 452    if (shProg->VertexProgram) {
 453       if (!_slang_resolve_attributes(shProg, &shProg->VertexProgram->Base)) {
 454          /*goto cleanup;*/
 455          _mesa_problem(ctx, "_slang_resolve_attributes() failed");
 456          return;
 457       }
 458    }
 459
 460    if (shProg->VertexProgram) {
 461       _slang_update_inputs_outputs(&shProg->VertexProgram->Base);
 462       if (!(shProg->VertexProgram->Base.OutputsWritten & (1 << VERT_RESULT_HPOS))) {
 463          /* the vertex program did not compute a vertex position */
 464          link_error(shProg,
 465                     "gl_Position was not written by vertex shader\n");
 466          return;
 467       }
 468    }
 469    if (shProg->FragmentProgram)
 470       _slang_update_inputs_outputs(&shProg->FragmentProgram->Base);
 471
 472    /* Check that all the varying vars needed by the fragment shader are
 473     * actually produced by the vertex shader.
 474     */
 475    if (shProg->FragmentProgram) {
 476       const GLbitfield varyingRead
 477          = shProg->FragmentProgram->Base.InputsRead >> FRAG_ATTRIB_VAR0;
 478       const GLbitfield varyingWritten = shProg->VertexProgram ?
 479          shProg->VertexProgram->Base.OutputsWritten >> VERT_RESULT_VAR0 : 0x0;
 480       if ((varyingRead & varyingWritten) != varyingRead) {
 481          link_error(shProg,
 482           "Fragment program using varying vars not written by vertex shader\n");
 483          return;
 484       }
 485    }
 486
 487    /* Check that the vertex program doesn't use too many sampler units */
 488    if (shProg->VertexProgram &&
 489        _mesa_bitcount(shProg->VertexProgram->Base.SamplersUsed) > ctx->Const.MaxVertexTextureImageUnits) {
 490       link_error(shProg, "Vertex program uses too many samplers.\n");
 491       return;
 492    }
 493
 494    if (fragProg && shProg->FragmentProgram) {
 495       /* notify driver that a new fragment program has been compiled/linked */
 496       ctx->Driver.ProgramStringNotify(ctx, GL_FRAGMENT_PROGRAM_ARB,
 497                                       &shProg->FragmentProgram->Base);
 498 #if 0
 499       printf("************** original fragment program\n");
 500       _mesa_print_program(&fragProg->Base);
 501       _mesa_print_program_parameters(ctx, &fragProg->Base);
 502 #endif
 503 #if 0
 504       printf("************** linked fragment prog\n");
 505       _mesa_print_program(&shProg->FragmentProgram->Base);
 506       _mesa_print_program_parameters(ctx, &shProg->FragmentProgram->Base);
 507 #endif
 508    }
 509
 510    if (vertProg && shProg->VertexProgram) {
 511       /* notify driver that a new vertex program has been compiled/linked */
 512       ctx->Driver.ProgramStringNotify(ctx, GL_VERTEX_PROGRAM_ARB,
 513                                       &shProg->VertexProgram->Base);
 514 #if 0
 515       printf("************** original vertex program\n");
 516       _mesa_print_program(&vertProg->Base);
 517       _mesa_print_program_parameters(ctx, &vertProg->Base);
 518 #endif
 519 #if 0
 520       printf("************** linked vertex prog\n");
 521       _mesa_print_program(&shProg->VertexProgram->Base);
 522       _mesa_print_program_parameters(ctx, &shProg->VertexProgram->Base);
 523 #endif
 524    }
 525
 526    shProg->LinkStatus = (shProg->VertexProgram || shProg->FragmentProgram);
 527 }
 528