From 82dd62fb22c8f88d62e3c77666c6805a2ac6ecd3 Mon Sep 17 00:00:00 2001 From: Brian Paul Date: Thu, 24 Mar 2011 11:39:21 -0600 Subject: mesa: new MESA_EXTENSION_MAX_YEAR env var If set to year X, only report extensions up to that year. This is a work-around for games that try to copy the extensions string to a fixed size buffer and overflow. If a game was released in year X, setting MESA_EXTENSION_MAX_YEAR to that year will likely fix the problem. --- src/mesa/main/extensions.c | 20 +++++++++++++++++--- 1 file changed, 17 insertions(+), 3 deletions(-) (limited to 'src/mesa/main/extensions.c') diff --git a/src/mesa/main/extensions.c b/src/mesa/main/extensions.c index 4b6e91c4f31..728c73c10ae 100644 --- a/src/mesa/main/extensions.c +++ b/src/mesa/main/extensions.c @@ -875,12 +875,24 @@ _mesa_make_extension_string(struct gl_context *ctx) GLboolean *base = (GLboolean *) &ctx->Extensions; const struct extension *i; 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 (i = extension_table; i->name != 0; ++i) { - if (base[i->offset] && (i->api_set & (1 << ctx->API))) { + if (base[i->offset] && + i->year <= maxYear && + (i->api_set & (1 << ctx->API))) { length += strlen(i->name) + 1; /* +1 for space */ ++count; } @@ -908,7 +920,9 @@ _mesa_make_extension_string(struct gl_context *ctx) */ j = 0; for (i = extension_table; i->name != 0; ++i) { - if (base[i->offset] && (i->api_set & (1 << ctx->API))) { + if (base[i->offset] && + i->year <= maxYear && + (i->api_set & (1 << ctx->API))) { extension_indices[j++] = i - extension_table; } } -- cgit v1.2.3