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authorJordan Justen <[email protected]>2012-09-01 01:38:08 -0700
committerJordan Justen <[email protected]>2012-09-28 16:15:51 -0700
commit00905dbf19712c532bcdb2a2f7bf5d327d4df97b (patch)
tree44aafa4af9176b08477aa9609e956ec69dc3a2a1
parente87c63f2889fcbeb5a8bbd91eda1333d7ed44bf2 (diff)
mesa: allow MESA_GL_VERSION_OVERRIDE to override the API type
Change the format to MAJOR.MINOR[FC] For example: 2.1, 3.0FC, 3.1 The FC suffix indicates a forward compatible context, and is only valid for versions >= 3.0. Examples: 2.1: GL Legacy/Compatibility context 3.0: GL Legacy/Compatibility context 3.0FC: GL Core Profile context + Forward Compatible 3.1: GL Core Profile context 3.1FC: GL Core Profile context + Forward Compatible Signed-off-by: Jordan Justen <[email protected]> Reviewed-by: Chad Versace <[email protected]> Reviewed-by: Eric Anholt <[email protected]>
-rw-r--r--docs/envvars.html22
-rw-r--r--src/mesa/main/context.c4
-rw-r--r--src/mesa/main/version.c82
-rw-r--r--src/mesa/main/version.h3
4 files changed, 88 insertions, 23 deletions
diff --git a/docs/envvars.html b/docs/envvars.html
index 49c9025dac2..5d855c630d7 100644
--- a/docs/envvars.html
+++ b/docs/envvars.html
@@ -69,9 +69,25 @@ If the extension string is too long, the buffer overrun can cause the game
to crash.
This is a work-around for that.
<li>MESA_GL_VERSION_OVERRIDE - changes the value returned by
-glGetString(GL_VERSION). Valid values are point-separated version numbers,
-such as "3.0". Mesa will not really implement all the features of the given
-version if it's higher than what's normally reported.
+glGetString(GL_VERSION) and possibly the GL API type.
+<ul>
+<li> The format should be MAJOR.MINOR[FC]
+<li> FC is an optional suffix that indicates a forward compatible context.
+This is only valid for versions &gt;= 3.0.
+<li> GL versions &lt; 3.0 are set to a compatibility (non-Core) profile
+<li> GL versions = 3.0, see below
+<li> GL versions &gt; 3.0 are set to a Core profile
+<li> Examples: 2.1, 3.0, 3.0FC, 3.1, 3.1FC
+<ul>
+<li> 2.1 - select a compatibility (non-Core) profile with GL version 2.1
+<li> 3.0 - select a compatibility (non-Core) profile with GL version 3.0
+<li> 3.0FC - select a Core+Forward Compatible profile with GL version 3.0
+<li> 3.1 - select a Core profile with GL version 3.1
+<li> 3.1FC - select a Core+Forward Compatible profile with GL version 3.1
+</ul>
+<li> Mesa may not really implement all the features of the given version.
+(for developers only)
+</ul>
<li>MESA_GLSL_VERSION_OVERRIDE - changes the value returned by
glGetString(GL_SHADING_LANGUAGE_VERSION). Valid values are integers, such as
"130". Mesa will not really implement all the features of the given language version
diff --git a/src/mesa/main/context.c b/src/mesa/main/context.c
index e55e2fdee3b..8d5dd1e5bd2 100644
--- a/src/mesa/main/context.c
+++ b/src/mesa/main/context.c
@@ -921,6 +921,10 @@ _mesa_initialize_context(struct gl_context *ctx,
ctx->WinSysDrawBuffer = NULL;
ctx->WinSysReadBuffer = NULL;
+ if (_mesa_is_desktop_gl(ctx)) {
+ _mesa_override_gl_version(ctx);
+ }
+
/* misc one-time initializations */
one_time_init(ctx);
diff --git a/src/mesa/main/version.c b/src/mesa/main/version.c
index 19d514d4aa9..a1fcec46dcd 100644
--- a/src/mesa/main/version.c
+++ b/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(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;
+ }
}
/**
@@ -78,6 +73,55 @@ create_version_string(struct gl_context *ctx, const char *prefix)
}
/**
+ * 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, "");
+ }
+ }
+}
+
+/**
* Override the context's GLSL version if the environment variable
* MESA_GLSL_VERSION_OVERRIDE is set. Valid values for
* MESA_GLSL_VERSION_OVERRIDE are integers, such as "130".
@@ -244,8 +288,6 @@ compute_version(struct gl_context *ctx)
ctx->Version = major * 10 + minor;
- override_version(ctx);
-
create_version_string(ctx, "");
}
diff --git a/src/mesa/main/version.h b/src/mesa/main/version.h
index f0ba6f267fb..1aab37d6936 100644
--- a/src/mesa/main/version.h
+++ b/src/mesa/main/version.h
@@ -46,6 +46,9 @@ extern void
_mesa_compute_version(struct gl_context *ctx);
extern void
+_mesa_override_gl_version(struct gl_context *ctx);
+
+extern void
_mesa_override_glsl_version(struct gl_context *ctx);
#endif /* VERSION_H */