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 #include "util/strtod.h"
33
34 extern int glcpp_parser_debug;
35
36 void
_mesa_reference_shader(struct gl_context * ctx,struct gl_shader ** ptr,struct gl_shader * sh)37 _mesa_reference_shader(struct gl_context *ctx, struct gl_shader **ptr,
38 struct gl_shader *sh)
39 {
40 (void) ctx;
41 *ptr = sh;
42 }
43
44 /* Read from fp until EOF and return a string of everything read.
45 */
46 static char *
load_text_fp(void * ctx,FILE * fp)47 load_text_fp (void *ctx, FILE *fp)
48 {
49 #define CHUNK 4096
50 char *text = NULL;
51 size_t text_size = 0;
52 size_t total_read = 0;
53 size_t bytes;
54
55 while (1) {
56 if (total_read + CHUNK + 1 > text_size) {
57 text_size = text_size ? text_size * 2 : CHUNK + 1;
58 text = reralloc_size (ctx, text, text_size);
59 if (text == NULL) {
60 fprintf (stderr, "Out of memory\n");
61 return NULL;
62 }
63 }
64 bytes = fread (text + total_read, 1, CHUNK, fp);
65 total_read += bytes;
66
67 if (bytes < CHUNK) {
68 break;
69 }
70 }
71
72 text[total_read] = '\0';
73
74 return text;
75 }
76
77 static char *
load_text_file(void * ctx,const char * filename)78 load_text_file(void *ctx, const char *filename)
79 {
80 char *text;
81 FILE *fp;
82
83 if (filename == NULL || strcmp (filename, "-") == 0)
84 return load_text_fp (ctx, stdin);
85
86 fp = fopen (filename, "r");
87 if (fp == NULL) {
88 fprintf (stderr, "Failed to open file %s: %s\n",
89 filename, strerror (errno));
90 return NULL;
91 }
92
93 text = load_text_fp (ctx, fp);
94
95 fclose(fp);
96
97 return text;
98 }
99
100 /* Initialize only those things that glcpp cares about.
101 */
102 static void
init_fake_gl_context(struct gl_context * gl_ctx)103 init_fake_gl_context (struct gl_context *gl_ctx)
104 {
105 memset(gl_ctx, 0, sizeof(*gl_ctx));
106 gl_ctx->API = API_OPENGL_COMPAT;
107 gl_ctx->Const.DisableGLSLLineContinuations = false;
108 }
109
110 static void
usage(void)111 usage (void)
112 {
113 fprintf (stderr,
114 "Usage: glcpp [OPTIONS] [--] [<filename>]\n"
115 "\n"
116 "Pre-process the given filename (stdin if no filename given).\n"
117 "The following options are supported:\n"
118 " --disable-line-continuations Do not interpret lines ending with a\n"
119 " backslash ('\\') as a line continuation.\n");
120 }
121
122 enum {
123 DISABLE_LINE_CONTINUATIONS_OPT = CHAR_MAX + 1
124 };
125
126 static const struct option
127 long_options[] = {
128 {"disable-line-continuations", no_argument, 0, DISABLE_LINE_CONTINUATIONS_OPT },
129 {"debug", no_argument, 0, 'd'},
130 {0, 0, 0, 0 }
131 };
132
133 int
main(int argc,char * argv[])134 main (int argc, char *argv[])
135 {
136 char *filename = NULL;
137 void *ctx = ralloc(NULL, void*);
138 char *info_log = ralloc_strdup(ctx, "");
139 const char *shader;
140 int ret;
141 struct gl_context gl_ctx;
142 int c;
143
144 init_fake_gl_context (&gl_ctx);
145
146 while ((c = getopt_long(argc, argv, "d", long_options, NULL)) != -1) {
147 switch (c) {
148 case DISABLE_LINE_CONTINUATIONS_OPT:
149 gl_ctx.Const.DisableGLSLLineContinuations = true;
150 break;
151 case 'd':
152 glcpp_parser_debug = 1;
153 break;
154 default:
155 usage ();
156 exit (1);
157 }
158 }
159
160 if (optind + 1 < argc) {
161 printf ("Unexpected argument: %s\n", argv[optind+1]);
162 usage ();
163 exit (1);
164 }
165 if (optind < argc) {
166 filename = argv[optind];
167 }
168
169 shader = load_text_file (ctx, filename);
170 if (shader == NULL)
171 return 1;
172
173 _mesa_locale_init();
174
175 ret = glcpp_preprocess(ctx, &shader, &info_log, NULL, NULL, &gl_ctx);
176
177 printf("%s", shader);
178 fprintf(stderr, "%s", info_log);
179
180 ralloc_free(ctx);
181
182 return ret;
183 }
184