/**
* Construct the GL_EXTENSIONS string. Called the first time that
* glGetString(GL_EXTENSIONS) is called.
*/
GLubyte*
_mesa_make_extension_string(struct gl_context *ctx)
{
/* The extension string. */
char *exts = 0;
/* Length of extension string. */
size_t length = 0;
/* Number of extensions */
unsigned count;
/* Indices of the extensions sorted by year */
extension_index *extension_indices;
/* String of extra extensions. */
char *extra_extensions = get_extension_override(ctx);
GLboolean *base = (GLboolean *) &ctx->Extensions;
const struct extension *i;
unsigned j;
unsigned maxYear = ~0;
unsigned api_set = (1 << ctx->API);
if (_mesa_is_gles3(ctx))
api_set |= ES3;
/* Check if the MESA_EXTENSION_MAX_YEAR env var is set */
{
const char *env = getenv("MESA_EXTENSION_MAX_YEAR");
if (env) {
maxYear = atoi(env);
_mesa_debug(ctx, "Note: limiting GL extensions to %u or earlier\n",
maxYear);
}
}
/* Compute length of the extension string. */
count = 0;
for (i = extension_table; i->name != 0; ++i) {
if (base[i->offset] &&
i->year <= maxYear &&
(i->api_set & api_set)) {
length += strlen(i->name) + 1; /* +1 for space */
++count;
}
}
if (extra_extensions != NULL)
length += 1 + strlen(extra_extensions); /* +1 for space */
exts = calloc(ALIGN(length + 1, 4), sizeof(char));
if (exts == NULL) {
free(extra_extensions);
return NULL;
}
extension_indices = malloc(count * sizeof(extension_index));
if (extension_indices == NULL) {
free(exts);
free(extra_extensions);
return NULL;
}
/* Sort extensions in chronological order because certain old applications (e.g.,
* Quake3 demo) store the extension list in a static size buffer so chronologically
* order ensure that the extensions that such applications expect will fit into
* that buffer.
*/
j = 0;
for (i = extension_table; i->name != 0; ++i) {
if (base[i->offset] &&
i->year <= maxYear &&
(i->api_set & api_set)) {
extension_indices[j++] = i - extension_table;
}
}
assert(j == count);
qsort(extension_indices, count, sizeof *extension_indices, extension_compare);
/* Build the extension string.*/
for (j = 0; j < count; ++j) {
i = &extension_table[extension_indices[j]];
assert(base[i->offset] && (i->api_set & api_set));
strcat(exts, i->name);
strcat(exts, " ");
}
free(extension_indices);
if (extra_extensions != 0) {
strcat(exts, extra_extensions);
free(extra_extensions);
}
return (GLubyte *) exts;
}
/**
* Construct the GL_EXTENSIONS string. Called the first time that
* glGetString(GL_EXTENSIONS) is called.
*/
GLubyte*
_mesa_make_extension_string(struct gl_context *ctx)
{
/* The extension string. */
char *exts = 0;
/* Length of extension string. */
size_t length = 0;
/* Number of extensions */
unsigned count;
/* Indices of the extensions sorted by year */
extension_index *extension_indices;
/* String of extra extensions. */
char *extra_extensions = get_extension_override(ctx);
unsigned k;
unsigned j;
unsigned maxYear = ~0;
/* Check if the MESA_EXTENSION_MAX_YEAR env var is set */
{
const char *env = getenv("MESA_EXTENSION_MAX_YEAR");
if (env) {
maxYear = atoi(env);
_mesa_debug(ctx, "Note: limiting GL extensions to %u or earlier\n",
maxYear);
}
}
/* Compute length of the extension string. */
count = 0;
for (k = 0; k < MESA_EXTENSION_COUNT; ++k) {
const struct mesa_extension *i = _mesa_extension_table + k;
if (i->year <= maxYear &&
_mesa_extension_supported(ctx, k)) {
length += strlen(i->name) + 1; /* +1 for space */
++count;
}
}
if (extra_extensions != NULL)
length += 1 + strlen(extra_extensions); /* +1 for space */
exts = calloc(ALIGN(length + 1, 4), sizeof(char));
if (exts == NULL) {
free(extra_extensions);
return NULL;
}
extension_indices = malloc(count * sizeof(extension_index));
if (extension_indices == NULL) {
free(exts);
free(extra_extensions);
return NULL;
}
/* Sort extensions in chronological order because certain old applications
* (e.g., Quake3 demo) store the extension list in a static size buffer so
* chronologically order ensure that the extensions that such applications
* expect will fit into that buffer.
*/
j = 0;
for (k = 0; k < MESA_EXTENSION_COUNT; ++k) {
if (_mesa_extension_table[k].year <= maxYear &&
_mesa_extension_supported(ctx, k)) {
extension_indices[j++] = k;
}
}
assert(j == count);
qsort(extension_indices, count,
sizeof *extension_indices, extension_compare);
/* Build the extension string.*/
for (j = 0; j < count; ++j) {
const struct mesa_extension *i = &_mesa_extension_table[extension_indices[j]];
assert(_mesa_extension_supported(ctx, extension_indices[j]));
strcat(exts, i->name);
strcat(exts, " ");
}
free(extension_indices);
if (extra_extensions != 0) {
strcat(exts, extra_extensions);
free(extra_extensions);
}
return (GLubyte *) exts;
}
