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/*
* kmscon - Generate Shader Files
*
* Copyright (c) 2011 David Herrmann <dh.herrmann@googlemail.com>
* Copyright (c) 2011 University of Tuebingen
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/*
* Shader Generator
* This takes as arguments two shaders and creates a C-source file which
* contains these shaders as constants.
*/
#include <stdio.h>
#include <stdlib.h>
static char *read_file(const char *path, size_t *size)
{
FILE *ffile;
ssize_t len;
char *buf;
ffile = fopen(path, "rb");
if (!ffile) {
fprintf(stderr, "genshader: cannot open %s: %m\n", path);
abort();
}
if (fseek(ffile, 0, SEEK_END) != 0) {
fprintf(stderr, "genshader: cannot seek %s: %m\n", path);
abort();
}
len = ftell(ffile);
if (len < 0) {
fprintf(stderr, "genshader: cannot tell %s: %m\n", path);
abort();
}
if (len < 1) {
fprintf(stderr, "genshader: empty file %s\n", path);
abort();
}
rewind(ffile);
buf = malloc(len + 1);
if (!buf) {
fprintf(stderr, "genshader: memory allocation failed\n");
abort();
}
if (len != fread(buf, 1, len, ffile)) {
fprintf(stderr, "genshader: cannot read %s: %m\n", path);
abort();
}
buf[len] = 0;
*size = len;
fclose(ffile);
return buf;
}
static void write_seq(FILE *out, const char *src, size_t len)
{
size_t i;
for (i = 0; i < len; ++i) {
if (src[i] == '\n') {
fwrite("\\n\"\n\"", 5, 1, out);
} else if (src[i] == '"') {
fwrite("\\\"", 2, 1, out);
} else {
fwrite(&src[i], 1, 1, out);
}
}
}
static void write_file(const char *path, const char *vs, size_t l1,
const char *fs, size_t l2)
{
FILE *out;
static const char c1[] = "/* This file is generated by genshader.c */\n"
"const char *kmscon_vert_shader = \"";
static const char c2[] = "\";\nconst char *kmscon_frag_shader = \"";
static const char c3[] = "\";";
out = fopen(path, "wb");
if (!out) {
fprintf(stderr, "genshader: cannot open %s: %m\n", path);
abort();
}
fwrite(c1, sizeof(c1) - 1, 1, out);
write_seq(out, vs, l1);
fwrite(c2, sizeof(c2) - 1, 1, out);
write_seq(out, fs, l2);
fwrite(c3, sizeof(c3) - 1, 1, out);
fclose(out);
}
int main(int argc, char *argv[])
{
char *vert, *frag;
size_t vs, fs;
if (argc < 4) {
fprintf(stderr, "genshader: missing parameters\n");
return EXIT_FAILURE;
}
vert = read_file(argv[2], &vs);
frag = read_file(argv[3], &fs);
write_file(argv[1], vert, vs, frag, fs);
free(vert);
free(frag);
return EXIT_SUCCESS;
}
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