src/glsl/glcpp/glcpp.c

   1 /*
   2  * Copyright © 2010 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
  24 #include <stdio.h>
  25 #include <string.h>
  26 #include <errno.h>
  27 #include <getopt.h>
  28
  29 #include "glcpp.h"
  30 #include "main/mtypes.h"
  31 #include "main/shaderobj.h"
  32
  33 extern int yydebug;
  34
  35 void
  36 _mesa_reference_shader(struct gl_context *ctx, struct gl_shader **ptr,
  37                        struct gl_shader *sh)
  38 {
  39    (void) ctx;
  40    *ptr = sh;
  41 }
  42
  43 /* Read from fp until EOF and return a string of everything read.
  44  */
  45 static char *
  46 load_text_fp (void *ctx, FILE *fp)
  47 {
  48 #define CHUNK 4096
  49         char *text = NULL;
  50         size_t text_size = 0;
  51         size_t total_read = 0;
  52         size_t bytes;
  53
  54         while (1) {
  55                 if (total_read + CHUNK + 1 > text_size) {
  56                         text_size = text_size ? text_size * 2 : CHUNK + 1;
  57                         text = reralloc_size (ctx, text, text_size);
  58                         if (text == NULL) {
  59                                 fprintf (stderr, "Out of memory\n");
  60                                 return NULL;
  61                         }
  62                 }
  63                 bytes = fread (text + total_read, 1, CHUNK, fp);
  64                 total_read += bytes;
  65
  66                 if (bytes < CHUNK) {
  67                         break;
  68                 }
  69         }
  70
  71         text[total_read] = '\0';
  72
  73         return text;
  74 }
  75
  76 static char *
  77 load_text_file(void *ctx, const char *filename)
  78 {
  79         char *text;
  80         FILE *fp;
  81
  82         if (filename == NULL || strcmp (filename, "-") == 0)
  83                 return load_text_fp (ctx, stdin);
  84
  85         fp = fopen (filename, "r");
  86         if (fp == NULL) {
  87                 fprintf (stderr, "Failed to open file %s: %s\n",
  88                          filename, strerror (errno));
  89                 return NULL;
  90         }
  91
  92         text = load_text_fp (ctx, fp);
  93
  94         fclose(fp);
  95
  96         return text;
  97 }
  98
  99 /* Initialize only those things that glcpp cares about.
 100  */
 101 static void
 102 init_fake_gl_context (struct gl_context *gl_ctx)
 103 {
 104         gl_ctx->API = API_OPENGL_COMPAT;
 105         gl_ctx->Const.DisableGLSLLineContinuations = false;
 106 }
 107
 108 static void
 109 usage (void)
 110 {
 111         fprintf (stderr,
 112                  "Usage: glcpp [OPTIONS] [--] [<filename>]\n"
 113                  "\n"
 114                  "Pre-process the given filename (stdin if no filename given).\n"
 115                  "The following options are supported:\n"
 116                  "    --disable-line-continuations      Do not interpret lines ending with a\n"
 117                  "                                      backslash ('\\') as a line continuation.\n");
 118 }
 119
 120 enum {
 121         DISABLE_LINE_CONTINUATIONS_OPT = CHAR_MAX + 1
 122 };
 123
 124 const static struct option
 125 long_options[] = {
 126         {"disable-line-continuations", no_argument, 0, DISABLE_LINE_CONTINUATIONS_OPT },
 127         {0,                            0,           0, 0 }
 128 };
 129
 130 int
 131 main (int argc, char *argv[])
 132 {
 133         char *filename = NULL;
 134         void *ctx = ralloc(NULL, void*);
 135         char *info_log = ralloc_strdup(ctx, "");
 136         const char *shader;
 137         int ret;
 138         struct gl_context gl_ctx;
 139         int c;
 140
 141         init_fake_gl_context (&gl_ctx);
 142
 143         while ((c = getopt_long(argc, argv, "", long_options, NULL)) != -1) {
 144                 switch (c) {
 145                 case DISABLE_LINE_CONTINUATIONS_OPT:
 146                         gl_ctx.Const.DisableGLSLLineContinuations = true;
 147                         break;
 148                 default:
 149                         usage ();
 150                         exit (1);
 151                 }
 152         }
 153
 154         if (optind + 1 < argc) {
 155                 printf ("Unexpected argument: %s\n", argv[optind+1]);
 156                 usage ();
 157                 exit (1);
 158         }
 159         if (optind < argc) {
 160                 filename = argv[optind];
 161         }
 162
 163         shader = load_text_file (ctx, filename);
 164         if (shader == NULL)
 165            return 1;
 166
 167         ret = glcpp_preprocess(ctx, &shader, &info_log, NULL, &gl_ctx);
 168
 169         printf("%s", shader);
 170         fprintf(stderr, "%s", info_log);
 171
 172         ralloc_free(ctx);
 173
 174         return ret;
 175 }