src/glsl/main.cpp

   1 /*
   2  * Copyright © 2008, 2009 Intel Corporation
   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  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * 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 NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23 #include <cstdlib>
  24 #include <cstdio>
  25 #include <getopt.h>
  26
  27 #include <sys/types.h>
  28 #include <sys/stat.h>
  29 #include <fcntl.h>
  30 #include <unistd.h>
  31
  32 #include "ast.h"
  33 #include "glsl_parser_extras.h"
  34 #include "glsl_parser.h"
  35 #include "ir_optimization.h"
  36 #include "ir_print_visitor.h"
  37 #include "program.h"
  38
  39 extern "C" struct gl_shader *
  40 _mesa_new_shader(GLcontext *ctx, GLuint name, GLenum type);
  41
  42 /* Copied from shader_api.c for the stand-alone compiler.
  43  */
  44 struct gl_shader *
  45 _mesa_new_shader(GLcontext *ctx, GLuint name, GLenum type)
  46 {
  47    struct gl_shader *shader;
  48    assert(type == GL_FRAGMENT_SHADER || type == GL_VERTEX_SHADER);
  49    shader = talloc_zero(NULL, struct gl_shader);
  50    if (shader) {
  51       shader->Type = type;
  52       shader->Name = name;
  53       shader->RefCount = 1;
  54    }
  55    return shader;
  56 }
  57
  58 /* Returned string will have 'ctx' as its talloc owner. */
  59 static char *
  60 load_text_file(void *ctx, const char *file_name)
  61 {
  62         char *text = NULL;
  63         struct stat st;
  64         ssize_t total_read = 0;
  65         int fd = open(file_name, O_RDONLY);
  66
  67         if (fd < 0) {
  68                 return NULL;
  69         }
  70
  71         if (fstat(fd, & st) == 0) {
  72            text = (char *) talloc_size(ctx, st.st_size + 1);
  73                 if (text != NULL) {
  74                         do {
  75                                 ssize_t bytes = read(fd, text + total_read,
  76                                                      st.st_size - total_read);
  77                                 if (bytes < 0) {
  78                                         free(text);
  79                                         text = NULL;
  80                                         break;
  81                                 }
  82
  83                                 if (bytes == 0) {
  84                                         break;
  85                                 }
  86
  87                                 total_read += bytes;
  88                         } while (total_read < st.st_size);
  89
  90                         text[total_read] = '\0';
  91                 }
  92         }
  93
  94         close(fd);
  95
  96         return text;
  97 }
  98
  99
 100 void
 101 usage_fail(const char *name)
 102 {
 103       printf("%s <filename.frag|filename.vert>\n", name);
 104       exit(EXIT_FAILURE);
 105 }
 106
 107
 108 int dump_ast = 0;
 109 int dump_hir = 0;
 110 int dump_lir = 0;
 111 int do_link = 0;
 112
 113 const struct option compiler_opts[] = {
 114    { "dump-ast", 0, &dump_ast, 1 },
 115    { "dump-hir", 0, &dump_hir, 1 },
 116    { "dump-lir", 0, &dump_lir, 1 },
 117    { "link",     0, &do_link,  1 },
 118    { NULL, 0, NULL, 0 }
 119 };
 120
 121 static void
 122 steal_memory(ir_instruction *ir, void *new_ctx)
 123 {
 124    talloc_steal(new_ctx, ir);
 125 }
 126
 127 void
 128 compile_shader(struct gl_shader *shader)
 129 {
 130    struct _mesa_glsl_parse_state *state;
 131    struct gl_extensions ext;
 132
 133    state = talloc_zero(talloc_parent(shader), struct _mesa_glsl_parse_state);
 134
 135    switch (shader->Type) {
 136    case GL_VERTEX_SHADER:   state->target = vertex_shader; break;
 137    case GL_FRAGMENT_SHADER: state->target = fragment_shader; break;
 138    case GL_GEOMETRY_SHADER: state->target = geometry_shader; break;
 139    }
 140
 141    state->scanner = NULL;
 142    state->translation_unit.make_empty();
 143    state->symbols = new(shader) glsl_symbol_table;
 144    state->info_log = talloc_strdup(shader, "");
 145    state->error = false;
 146    state->loop_or_switch_nesting = NULL;
 147    state->ARB_texture_rectangle_enable = true;
 148
 149    memset(&ext, 0, sizeof(ext));
 150    state->extensions = &ext;
 151    state->Const.MaxDrawBuffers = 2;
 152    state->Const.MaxTextureCoords = 4;
 153
 154    const char *source = shader->Source;
 155    state->error = preprocess(state, &source, &state->info_log, &ext);
 156
 157    if (!state->error) {
 158       _mesa_glsl_lexer_ctor(state, source);
 159       _mesa_glsl_parse(state);
 160       _mesa_glsl_lexer_dtor(state);
 161    }
 162
 163    if (dump_ast) {
 164       foreach_list_const(n, &state->translation_unit) {
 165          ast_node *ast = exec_node_data(ast_node, n, link);
 166          ast->print();
 167       }
 168       printf("\n\n");
 169    }
 170
 171    shader->ir = new(shader) exec_list;
 172    if (!state->error && !state->translation_unit.is_empty())
 173       _mesa_ast_to_hir(shader->ir, state);
 174
 175    validate_ir_tree(shader->ir);
 176
 177    /* Print out the unoptimized IR. */
 178    if (!state->error && dump_hir) {
 179       _mesa_print_ir(shader->ir, state);
 180    }
 181
 182    /* Optimization passes */
 183    if (!state->error && !shader->ir->is_empty()) {
 184       bool progress;
 185       do {
 186          progress = false;
 187
 188          progress = do_function_inlining(shader->ir) || progress;
 189          progress = do_if_simplification(shader->ir) || progress;
 190          progress = do_copy_propagation(shader->ir) || progress;
 191          progress = do_dead_code_local(shader->ir) || progress;
 192          progress = do_dead_code_unlinked(state, shader->ir) || progress;
 193          progress = do_constant_variable_unlinked(shader->ir) || progress;
 194          progress = do_constant_folding(shader->ir) || progress;
 195          progress = do_vec_index_to_swizzle(shader->ir) || progress;
 196          progress = do_vec_index_to_cond_assign(shader->ir) || progress;
 197          progress = do_swizzle_swizzle(shader->ir) || progress;
 198       } while (progress);
 199    }
 200
 201    validate_ir_tree(shader->ir);
 202
 203    /* Print out the resulting IR */
 204    if (!state->error && dump_lir) {
 205       _mesa_print_ir(shader->ir, state);
 206    }
 207
 208    shader->symbols = state->symbols;
 209    shader->CompileStatus = !state->error;
 210    shader->Version = state->language_version;
 211
 212    if (shader->InfoLog)
 213       talloc_free(shader->InfoLog);
 214
 215    shader->InfoLog = state->info_log;
 216
 217    /* Retain any live IR, but trash the rest. */
 218    foreach_list(node, shader->ir) {
 219       visit_tree((ir_instruction *) node, steal_memory, shader);
 220    }
 221
 222    talloc_free(state);
 223
 224    return;
 225 }
 226
 227 int
 228 main(int argc, char **argv)
 229 {
 230    int status = EXIT_SUCCESS;
 231
 232    int c;
 233    int idx = 0;
 234    while ((c = getopt_long(argc, argv, "", compiler_opts, &idx)) != -1)
 235       /* empty */ ;
 236
 237
 238    if (argc <= optind)
 239       usage_fail(argv[0]);
 240
 241    struct gl_shader_program *whole_program;
 242
 243    whole_program = talloc_zero (NULL, struct gl_shader_program);
 244    assert(whole_program != NULL);
 245
 246    for (/* empty */; argc > optind; optind++) {
 247       whole_program->Shaders = (struct gl_shader **)
 248          talloc_realloc(whole_program, whole_program->Shaders,
 249                         struct gl_shader *, whole_program->NumShaders + 1);
 250       assert(whole_program->Shaders != NULL);
 251
 252       struct gl_shader *shader = talloc_zero(whole_program, gl_shader);
 253
 254       whole_program->Shaders[whole_program->NumShaders] = shader;
 255       whole_program->NumShaders++;
 256
 257       const unsigned len = strlen(argv[optind]);
 258       if (len < 6)
 259          usage_fail(argv[0]);
 260
 261       const char *const ext = & argv[optind][len - 5];
 262       if (strncmp(".vert", ext, 5) == 0)
 263          shader->Type = GL_VERTEX_SHADER;
 264       else if (strncmp(".geom", ext, 5) == 0)
 265          shader->Type = GL_GEOMETRY_SHADER;
 266       else if (strncmp(".frag", ext, 5) == 0)
 267          shader->Type = GL_FRAGMENT_SHADER;
 268       else
 269          usage_fail(argv[0]);
 270
 271       shader->Source = load_text_file(whole_program, argv[optind]);
 272       if (shader->Source == NULL) {
 273          printf("File \"%s\" does not exist.\n", argv[optind]);
 274          exit(EXIT_FAILURE);
 275       }
 276
 277       compile_shader(shader);
 278
 279       if (!shader->CompileStatus) {
 280          printf("Info log for %s:\n%s\n", argv[optind], shader->InfoLog);
 281          status = EXIT_FAILURE;
 282          break;
 283       }
 284    }
 285
 286    if ((status == EXIT_SUCCESS) && do_link)  {
 287       link_shaders(whole_program);
 288       status = (whole_program->LinkStatus) ? EXIT_SUCCESS : EXIT_FAILURE;
 289
 290       if (strlen(whole_program->InfoLog) > 0)
 291          printf("Info log for linking:\n%s\n", whole_program->InfoLog);
 292    }
 293
 294    for (unsigned i = 0; i < whole_program->_NumLinkedShaders; i++)
 295       talloc_free(whole_program->_LinkedShaders[i]);
 296
 297    talloc_free(whole_program);
 298    _mesa_glsl_release_types();
 299
 300    return status;
 301 }