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 "glcpp.h"
  28 #include "main/mtypes.h"
  29 #include "main/shaderobj.h"
  30
  31 extern int yydebug;
  32
  33 void
  34 _mesa_reference_shader(struct gl_context *ctx, struct gl_shader **ptr,
  35                        struct gl_shader *sh)
  36 {
  37    *ptr = sh;
  38 }
  39
  40 /* Read from fp until EOF and return a string of everything read.
  41  */
  42 static char *
  43 load_text_fp (void *ctx, FILE *fp)
  44 {
  45 #define CHUNK 4096
  46         char *text = NULL;
  47         size_t text_size = 0;
  48         size_t total_read = 0;
  49         size_t bytes;
  50
  51         while (1) {
  52                 if (total_read + CHUNK + 1 > text_size) {
  53                         text_size = text_size ? text_size * 2 : CHUNK + 1;
  54                         text = reralloc_size (ctx, text, text_size);
  55                         if (text == NULL) {
  56                                 fprintf (stderr, "Out of memory\n");
  57                                 return NULL;
  58                         }
  59                 }
  60                 bytes = fread (text + total_read, 1, CHUNK, fp);
  61                 total_read += bytes;
  62
  63                 if (bytes < CHUNK) {
  64                         break;
  65                 }
  66         }
  67
  68         text[total_read] = '\0';
  69
  70         return text;
  71 }
  72
  73 static char *
  74 load_text_file(void *ctx, const char *filename)
  75 {
  76         char *text;
  77         FILE *fp;
  78
  79         if (filename == NULL || strcmp (filename, "-") == 0)
  80                 return load_text_fp (ctx, stdin);
  81
  82         fp = fopen (filename, "r");
  83         if (fp == NULL) {
  84                 fprintf (stderr, "Failed to open file %s: %s\n",
  85                          filename, strerror (errno));
  86                 return NULL;
  87         }
  88
  89         text = load_text_fp (ctx, fp);
  90
  91         fclose(fp);
  92
  93         return text;
  94 }
  95
  96 int
  97 main (int argc, char *argv[])
  98 {
  99         char *filename = NULL;
 100         void *ctx = ralloc(NULL, void*);
 101         char *info_log = ralloc_strdup(ctx, "");
 102         const char *shader;
 103         int ret;
 104
 105         if (argc) {
 106                 filename = argv[1];
 107         }
 108
 109         shader = load_text_file (ctx, filename);
 110         if (shader == NULL)
 111            return 1;
 112
 113         ret = preprocess(ctx, &shader, &info_log, NULL, API_OPENGL);
 114
 115         printf("%s", shader);
 116         fprintf(stderr, "%s", info_log);
 117
 118         ralloc_free(ctx);
 119
 120         return ret;
 121 }