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/*
* Copyright © 2018 Intel Corporation
*
* 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 (including the next
* paragraph) 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.
*
*/
/**
* \file idtech-extension-strings.c
* Verify extensions used by idTech2 and idTech3 games occur in the first 2k
*
* For a long time idTech2- and idTech3-based games contained a bug in
* extension string handling. The engine would copy the extension string
* returned by the driver into a buffer on the stack. The engine would not be
* able to detect the existence of any extensions that occured after the size
* of the buffer.
*
* A 2011 Wine bug
* (https://www.winehq.org/pipermail/wine-bugs/2011-June/280463.html) suggests
* that the limit for at least Return to Castle Wofenstein is 4k. Some other
* evidence suggests that other games may have limits as low as 2k.
*
* Based on this evidence, my guess is that the buffer is 2k, but extension
* strings longer than 4k caused enough of a stack over run to lead to a
* crash.
*
* There are separate subtests for each game that has a different set of
* extension strings. This acts as a catalog of sorts for which games use
* which extensions. It also makes it clear which games have been tested.
*/
#include "piglit-util-gl.h"
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 10;
config.window_visual = PIGLIT_GL_VISUAL_RGB;
PIGLIT_GL_TEST_CONFIG_END
enum piglit_result
piglit_display(void)
{
/* UNREACHABLE */
return PIGLIT_FAIL;
}
/* List of extensions scraped from the Quake3 demo found in
* linuxq3ademo-1.11-6.x86.gz.sh. The Return to Castle Wolfenstein demo found
* in wolfspdemo-linux-1.1b.x86.run had the same list.
*/
const char *const q3demo_list[] = {
"GL_S3_s3tc",
"GL_EXT_texture_env_add",
"GL_ARB_multitexture",
"GL_EXT_compiled_vertex_array",
};
/* List of extensions used by the game "Star Trek Voyager" provided by
* Federico Dossena.
*/
const char *const star_trek_voyager_list[] = {
"GL_S3_s3tc",
"GL_EXT_texture_compression_s3tc",
"GL_EXT_texture_env_add",
"GL_EXT_texture_filter_anisotropic",
"GL_EXT_texture_edge_clamp",
"GL_ARB_multitexture",
"GL_EXT_compiled_vertex_array",
/* GL_ARB_texture_compression wasn't listed in the output of the
* application, but since GL_EXT_texture_compression_s3tc is layered
* on top of it, it really should check for it too...
*/
"GL_ARB_texture_compression",
};
static bool
check_extension_list(const char *application_name,
const char *extension_string,
const char *const list[],
unsigned num_extensions)
{
bool pass = true;
for (unsigned i = 0; i < num_extensions; i++) {
const unsigned len = strlen(list[i]);
const char *ptr = strstr(extension_string, list[i]);
while (ptr != NULL && ptr[len] != '\0' && ptr[len] != ' ')
ptr = strstr(ptr + len, list[i]);
if (ptr == NULL) {
if (!piglit_automatic) {
printf("Extension %s is not supported.\n",
list[i]);
}
continue;
}
const ptrdiff_t offset = (ptr - extension_string) + len;
if (offset >= 2048) {
printf("Extension %s is at offset %ld. Too far!\n",
list[i], (long) offset);
pass = false;
} else if (!piglit_automatic) {
printf("Extension %s is at offset %ld.\n",
list[i], (long) offset);
}
}
piglit_report_subtest_result(pass ? PIGLIT_PASS : PIGLIT_FAIL,
"%s", application_name);
return pass;
}
void
piglit_init(int argc, char **argv)
{
bool pass = true;
const char *const extension_string =
(const char *) glGetString(GL_EXTENSIONS);
pass = check_extension_list("linuxq3ademo-1.11-6.x86.gz.sh",
extension_string,
q3demo_list,
ARRAY_SIZE(q3demo_list))
&& pass;
pass = check_extension_list("Star Trek: Voyager - Elite Force",
extension_string,
star_trek_voyager_list,
ARRAY_SIZE(star_trek_voyager_list))
&& pass;
piglit_report_result(pass ? PIGLIT_PASS : PIGLIT_FAIL);
}
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