1 files changed, 66 insertions, 22 deletions

diff --git a/mesalib/src/mesa/main/version.c b/mesalib/src/mesa/main/version.c
index 7ee662714..8d69c3a05 100644
--- a/mesalib/src/mesa/main/version.c
+++ b/mesalib/src/mesa/main/version.c
@@ -28,30 +28,25 @@
 /*#include "git_sha1.h"*/
 
 /**
- * Override the context's GL version if the environment variable
- * MESA_GL_VERSION_OVERRIDE is set. Valid values of MESA_GL_VERSION_OVERRIDE
- * are point-separated version numbers, such as "3.0".
+ * Scans 'string' to see if it ends with 'ending'.
  */
-static void
-override_version(struct gl_context *ctx)
+static GLboolean
+check_for_ending(const char *string, const char *ending)
 {
-   const char *env_var = "MESA_GL_VERSION_OVERRIDE";
-   const char *version;
-   int n;
-   int major, minor;
+   int len1, len2;
 
-   version = getenv(env_var);
-   if (!version) {
-      return;
-   }
+   len1 = strlen(string);
+   len2 = strlen(ending);
 
-   n = sscanf(version, "%u.%u", &major, &minor);
-   if (n != 2) {
-      fprintf(stderr, "error: invalid value for %s: %s\n", env_var, version);
-      return;
+   if (len2 > len1) {
+      return GL_FALSE;
    }
 
-   ctx->Version = major * 10 + minor;
+   if (strcmp(string + (len1 - len2), ending) == 0) {
+      return GL_TRUE;
+   } else {
+      return GL_FALSE;
+   }
 }
 
 /**
@@ -65,13 +60,64 @@ create_version_string(struct gl_context *ctx, const char *prefix)
    ctx->VersionString = malloc(max);
    if (ctx->VersionString) {
       _mesa_snprintf(ctx->VersionString, max,
-		     "%s%u.%u Mesa " MESA_VERSION_STRING
+		     "%s%u.%u%s Mesa " MESA_VERSION_STRING
 #ifdef MESA_GIT_SHA1
 		     " (" MESA_GIT_SHA1 ")"
 #endif
 		     ,
 		     prefix,
-		     ctx->Version / 10, ctx->Version % 10);
+		     ctx->Version / 10, ctx->Version % 10,
+		     (ctx->API == API_OPENGL_CORE) ? " (Core Profile)" : ""
+		     );
+   }
+}
+
+/**
+ * Override the context's version and/or API type if the
+ * environment variable MESA_GL_VERSION_OVERRIDE is set.
+ *
+ * Example uses of MESA_GL_VERSION_OVERRIDE:
+ *
+ * 2.1: select a compatibility (non-Core) profile with GL version 2.1
+ * 3.0: select a compatibility (non-Core) profile with GL version 3.0
+ * 3.0FC: select a Core+Forward Compatible profile with GL version 3.0
+ * 3.1: select a Core profile with GL version 3.1
+ * 3.1FC: select a Core+Forward Compatible profile with GL version 3.1
+ */
+void
+_mesa_override_gl_version(struct gl_context *ctx)
+{
+   const char *env_var = "MESA_GL_VERSION_OVERRIDE";
+   const char *version;
+   int n;
+   int major, minor;
+   GLboolean fc_suffix;
+
+   version = getenv(env_var);
+   if (!version) {
+      return;
+   }
+
+   fc_suffix = check_for_ending(version, "FC");
+
+   n = sscanf(version, "%u.%u", &major, &minor);
+   if (n != 2) {
+      fprintf(stderr, "error: invalid value for %s: %s\n", env_var, version);
+   } else {
+      ctx->Version = major * 10 + minor;
+      if (ctx->Version < 30 && fc_suffix) {
+         fprintf(stderr, "error: invalid value for %s: %s\n", env_var, version);
+      } else {
+         if (ctx->Version >= 30 && fc_suffix) {
+            ctx->API = API_OPENGL_CORE;
+            ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT;
+         } else if (ctx->Version >= 31) {
+            ctx->API = API_OPENGL_CORE;
+         } else {
+            ctx->API = API_OPENGL;
+         }
+         create_version_string(ctx, "");
+      }
    }
 }
 
@@ -242,8 +288,6 @@ compute_version(struct gl_context *ctx)
 
    ctx->Version = major * 10 + minor;
 
-   override_version(ctx);
-
    create_version_string(ctx, "");
 }