mutter/cogl/cogl-gpu-info.c
Neil Roberts b6b9ac0b85 Add a cogl-version header
This adds a version header which contains macros to define which
version of Cogl the application is being compiled against. This helps
applications that want to support multiple incompatible versions of
Cogl at compile time.

The macros are called COGL_VERSION_{MAJOR,MINOR,MICRO}. This does not
match Clutter which names them CLUTTER_{MAJOR,MINOR,MICRO}_VERSION but
I think the former is nicer and it at least matches Cairo and Pango.

The values of the macro are defined to COGL_VERSION_*_INTERNAL which
is generated by the configure script into cogl-defines.h.

There is also a macro for the entire version as a string called
COGL_VERSION_STRING.

The internal utility macros for encoding a 3 part version number into
a single integer have been moved into the new header so they can be
used publicly as a convenient way to check if the version is within a
particular range. There is also a COGL_VERSION_CHECK macro for the
very common case that a feature will be used since a particular
version of Cogl. There is a macro called COGL_VERSION which contains
the pre-encoded version of Cogl being compiled against for
convenience.

Unlike in Clutter this patch does not add any runtime version
identification mechanism.

A test case is also added which just contains static asserts to sanity
check the macros.

Reviewed-by: Robert Bragg <robert@linux.intel.com>

(cherry picked from commit 3480cf140dc355fa87ab3fbcf0aeeb0124798a8f)
2012-08-06 14:27:40 +01:00

265 lines
7.2 KiB
C

/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2012 Intel Corporation.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <errno.h>
#include "cogl-gpu-info-private.h"
#include "cogl-context-private.h"
#include "cogl-version.h"
typedef struct
{
const char *renderer_string;
const char *version_string;
const char *vendor_string;
} CoglGpuInfoStrings;
typedef struct
{
CoglGpuInfoVendor vendor;
const char *name;
CoglBool (* check_function) (const CoglGpuInfoStrings *strings);
} CoglGpuInfoVendorDescription;
typedef struct
{
CoglGpuInfoDriverPackage driver_package;
const char *name;
CoglBool (* check_function) (const CoglGpuInfoStrings *strings,
int *version_out);
} CoglGpuInfoDriverPackageDescription;
static CoglBool
_cogl_gpu_info_parse_version_string (const char *version_string,
int n_components,
const char **tail,
int *version_ret)
{
int version = 0;
uint64_t part;
int i;
for (i = 0; ; i++)
{
errno = 0;
part = g_ascii_strtoull (version_string,
(char **) &version_string,
10);
if (errno || part > COGL_VERSION_MAX_COMPONENT_VALUE)
return FALSE;
version |= part << ((2 - i) * COGL_VERSION_COMPONENT_BITS);
if (i + 1 >= n_components)
break;
if (*version_string != '.')
return FALSE;
version_string++;
}
if (version_ret)
*version_ret = version;
if (tail)
*tail = version_string;
return TRUE;
}
static CoglBool
check_intel_vendor (const CoglGpuInfoStrings *strings)
{
const char *intel_part = strstr (strings->renderer_string, "Intel(R)");
if (intel_part == NULL)
return FALSE;
/* The match must either be at the beginning of the string or
preceded by a space. Just in case there's a company called
IAmNotIntel (R) or something */
if (intel_part > strings->renderer_string && intel_part[-1] != ' ')
return FALSE;
return TRUE;
}
static CoglBool
check_unknown_vendor (const CoglGpuInfoStrings *strings)
{
/* This is a last resort so it always matches */
return TRUE;
}
static const CoglGpuInfoVendorDescription
_cogl_gpu_info_vendors[] =
{
{
COGL_GPU_INFO_VENDOR_INTEL,
"Intel",
check_intel_vendor
},
/* Must be last */
{
COGL_GPU_INFO_VENDOR_UNKNOWN,
"Unknown",
check_unknown_vendor
}
};
static CoglBool
check_mesa_driver_package (const CoglGpuInfoStrings *strings,
int *version_ret)
{
uint64_t micro_part;
const char *v;
/* The version string should always begin a two-part GL version
number */
if (!_cogl_gpu_info_parse_version_string (strings->version_string,
2, /* n_components */
&v, /* tail */
NULL /* version_ret */))
return FALSE;
/* In mesa this will be followed by a space and the name "Mesa" */
if (!g_str_has_prefix (v, " Mesa "))
return FALSE;
v += 6;
/* Next there will be a version string that is at least two
components. On a git devel build the version will be something
like "-devel<git hash>" instead */
if (!_cogl_gpu_info_parse_version_string (v,
2, /* n_components */
&v, /* tail */
version_ret))
return FALSE;
/* If it is a development build then we'll just leave the micro
number as 0 */
if (g_str_has_prefix (v, "-devel"))
return TRUE;
/* Otherwise there should be a micro version number */
if (*v != '.')
return FALSE;
errno = 0;
micro_part = g_ascii_strtoull (v + 1, NULL /* endptr */, 10 /* base */);
if (errno || micro_part > COGL_VERSION_MAX_COMPONENT_VALUE)
return FALSE;
*version_ret = COGL_VERSION_ENCODE (COGL_VERSION_GET_MAJOR (*version_ret),
COGL_VERSION_GET_MINOR (*version_ret),
micro_part);
return TRUE;
}
static CoglBool
check_unknown_driver_package (const CoglGpuInfoStrings *strings,
int *version_out)
{
*version_out = 0;
/* This is a last resort so it always matches */
return TRUE;
}
static const CoglGpuInfoDriverPackageDescription
_cogl_gpu_info_driver_packages[] =
{
{
COGL_GPU_INFO_DRIVER_PACKAGE_MESA,
"Mesa",
check_mesa_driver_package
},
/* Must be last */
{
COGL_GPU_INFO_DRIVER_PACKAGE_UNKNOWN,
"Unknown",
check_unknown_driver_package
}
};
void
_cogl_gpu_info_init (CoglContext *ctx,
CoglGpuInfo *gpu)
{
CoglGpuInfoStrings strings;
int i;
strings.renderer_string = (const char *) ctx->glGetString (GL_RENDERER);
strings.version_string = (const char *) ctx->glGetString (GL_VERSION);
strings.vendor_string = (const char *) ctx->glGetString (GL_VENDOR);
/* Determine the driver package */
for (i = 0; ; i++)
{
const CoglGpuInfoDriverPackageDescription *description =
_cogl_gpu_info_driver_packages + i;
if (description->check_function (&strings, &gpu->driver_package_version))
{
gpu->driver_package = description->driver_package;
gpu->driver_package_name = description->name;
break;
}
}
/* Determine the GPU vendor */
for (i = 0; ; i++)
{
const CoglGpuInfoVendorDescription *description =
_cogl_gpu_info_vendors + i;
if (description->check_function (&strings))
{
gpu->vendor = description->vendor;
gpu->vendor_name = description->name;
break;
}
}
/* Determine the driver bugs */
/* In Mesa < 8.0.2 the glReadPixels implementation is really slow
because it converts each pixel to a floating point representation
and back even if the data could just be memcpy'd. The Intel
driver has a fast blit path when reading into a PBO. Reading into
a temporary PBO and then memcpying back out to the application's
memory is faster than a regular glReadPixels in this case */
if (gpu->vendor == COGL_GPU_INFO_VENDOR_INTEL &&
gpu->driver_package == COGL_GPU_INFO_DRIVER_PACKAGE_MESA &&
gpu->driver_package_version < COGL_VERSION_ENCODE (8, 0, 2))
gpu->driver_bugs |= COGL_GPU_INFO_DRIVER_BUG_MESA_46631_SLOW_READ_PIXELS;
}