diff options
| -rw-r--r-- | src/mesa/main/extensions.c | 112 |
1 files changed, 101 insertions, 11 deletions
diff --git a/src/mesa/main/extensions.c b/src/mesa/main/extensions.c index aa9513a550..490110a6d2 100644 --- a/src/mesa/main/extensions.c +++ b/src/mesa/main/extensions.c @@ -442,8 +442,9 @@ _mesa_enable_2_1_extensions(GLcontext *ctx) /** * Either enable or disable the named extension. + * \return GL_TRUE for success, GL_FALSE if invalid extension name */ -static void +static GLboolean set_extension( GLcontext *ctx, const char *name, GLboolean state ) { GLboolean *base = (GLboolean *) &ctx->Extensions; @@ -452,7 +453,7 @@ set_extension( GLcontext *ctx, const char *name, GLboolean state ) if (ctx->Extensions.String) { /* The string was already queried - can't change it now! */ _mesa_problem(ctx, "Trying to enable/disable extension after glGetString(GL_EXTENSIONS): %s", name); - return; + return GL_FALSE; } for (i = 0 ; i < Elements(default_extensions) ; i++) { @@ -461,10 +462,10 @@ set_extension( GLcontext *ctx, const char *name, GLboolean state ) GLboolean *enabled = base + default_extensions[i].flag_offset; *enabled = state; } - return; + return GL_TRUE; } } - _mesa_problem(ctx, "Trying to enable unknown extension: %s", name); + return GL_FALSE; } @@ -475,7 +476,8 @@ set_extension( GLcontext *ctx, const char *name, GLboolean state ) void _mesa_enable_extension( GLcontext *ctx, const char *name ) { - set_extension(ctx, name, GL_TRUE); + if (!set_extension(ctx, name, GL_TRUE)) + _mesa_problem(ctx, "Trying to enable unknown extension: %s", name); } @@ -486,7 +488,8 @@ _mesa_enable_extension( GLcontext *ctx, const char *name ) void _mesa_disable_extension( GLcontext *ctx, const char *name ) { - set_extension(ctx, name, GL_FALSE); + if (!set_extension(ctx, name, GL_FALSE)) + _mesa_problem(ctx, "Trying to disable unknown extension: %s", name); } @@ -511,6 +514,80 @@ _mesa_extension_is_enabled( GLcontext *ctx, const char *name ) /** + * Append string 'b' onto string 'a'. Free 'a' and return new string. + */ +static char * +append(const char *a, const char *b) +{ + const GLuint aLen = a ? _mesa_strlen(a) : 0; + const GLuint bLen = b ? _mesa_strlen(b) : 0; + char *s = _mesa_calloc(aLen + bLen + 1); + if (s) { + if (a) + _mesa_memcpy(s, a, aLen); + if (b) + _mesa_memcpy(s + aLen, b, bLen); + s[aLen + bLen] = '\0'; + } + if (a) + _mesa_free((void *) a); + return s; +} + + +/** + * Check the MESA_EXTENSION_OVERRIDE env var. + * For extension names that are recognized, turn them on. For extension + * names that are recognized and prefixed with '-', turn them off. + * Return a string of the unknown/leftover names. + */ +static const char * +get_extension_override( GLcontext *ctx ) +{ + const char *envExt = _mesa_getenv("MESA_EXTENSION_OVERRIDE"); + char *extraExt = NULL; + char ext[1000]; + GLuint extLen = 0; + GLuint i; + GLboolean disableExt = GL_FALSE; + + if (!envExt) + return NULL; + + for (i = 0; ; i++) { + if (envExt[i] == '\0' || envExt[i] == ' ') { + /* terminate/process 'ext' if extLen > 0 */ + if (extLen > 0) { + assert(extLen < sizeof(ext)); + /* enable extension named by 'ext' */ + ext[extLen] = 0; + if (!set_extension(ctx, ext, !disableExt)) { + /* unknown extension name, append it to extraExt */ + if (extraExt) { + extraExt = append(extraExt, " "); + } + extraExt = append(extraExt, ext); + } + extLen = 0; + disableExt = GL_FALSE; + } + if (envExt[i] == '\0') + break; + } + else if (envExt[i] == '-') { + disableExt = GL_TRUE; + } + else { + /* accumulate this non-space character */ + ext[extLen++] = envExt[i]; + } + } + + return extraExt; +} + + +/** * Run through the default_extensions array above and set the * ctx->Extensions.ARB/EXT_* flags accordingly. * To be called during context initialization. @@ -538,8 +615,9 @@ GLubyte * _mesa_make_extension_string( GLcontext *ctx ) { const GLboolean *base = (const GLboolean *) &ctx->Extensions; + const char *extraExt = get_extension_override(ctx); GLuint extStrLen = 0; - GLubyte *s; + char *s; GLuint i; /* first, compute length of the extension string */ @@ -549,7 +627,14 @@ _mesa_make_extension_string( GLcontext *ctx ) extStrLen += (GLuint)_mesa_strlen(default_extensions[i].name) + 1; } } - s = (GLubyte *) _mesa_malloc(extStrLen); + + if (extraExt) + extStrLen += _mesa_strlen(extraExt) + 1; /* +1 for space */ + + /* allocate the extension string */ + s = (char *) _mesa_malloc(extStrLen); + if (!s) + return NULL; /* second, build the extension string */ extStrLen = 0; @@ -559,13 +644,18 @@ _mesa_make_extension_string( GLcontext *ctx ) GLuint len = (GLuint)_mesa_strlen(default_extensions[i].name); _mesa_memcpy(s + extStrLen, default_extensions[i].name, len); extStrLen += len; - s[extStrLen] = (GLubyte) ' '; + s[extStrLen] = ' '; extStrLen++; } } ASSERT(extStrLen > 0); - s[extStrLen - 1] = 0; + s[extStrLen - 1] = 0; /* -1 to overwrite trailing the ' ' */ - return s; + if (extraExt) { + s = append(s, " "); + s = append(s, extraExt); + } + + return (GLubyte *) s; } |