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2037e0f4f1
This adds a CoglGpuInfo struct to the CoglContext which contains some enums describing the GL driver in use. This currently includes the driver package (ie, is it Mesa) the version number of the package and the vendor of the GPU (ie, is it by Intel). There is also a bitmask which will contain the workarounds that we should do for that particular driver configuration. The struct is initialised on context creation by using a series of string comparisons on the strings returned from glGetString. Reviewed-by: Robert Bragg <robert@linux.intel.com>
231 lines
7.2 KiB
C
231 lines
7.2 KiB
C
/*
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* Cogl
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*
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* An object oriented GL/GLES Abstraction/Utility Layer
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*
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* Copyright (C) 2007,2008,2009,2010 Intel Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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*
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*/
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#ifndef __COGL_UTIL_H
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#define __COGL_UTIL_H
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#include <glib.h>
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#include <math.h>
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#include <cogl/cogl-defines.h>
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#include "cogl-types.h"
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#ifndef COGL_HAS_GLIB_SUPPORT
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#include <stdio.h>
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#endif
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/* When compiling with Visual Studio, symbols that represent data that
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are exported out of the DLL need to be marked with the dllexport
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attribute. */
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#ifdef _MSC_VER
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#ifdef COGL_BUILD_EXP
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#define COGL_EXPORT __declspec(dllexport)
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#else
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#define COGL_EXPORT __declspec(dllimport)
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#endif
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#else
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#define COGL_EXPORT
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#endif
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/* Macros to handle compacting a 3-component version number into an
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int for quick comparison. This assumes all of the components are
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<= 1023 */
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#define COGL_VERSION_COMPONENT_BITS 10
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#define COGL_VERSION_MAX_COMPONENT_VALUE \
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((1 << COGL_VERSION_COMPONENT_BITS) - 1)
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#define COGL_VERSION_ENCODE(major, minor, micro) \
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(((major) << (COGL_VERSION_COMPONENT_BITS * 2)) | \
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((minor) << COGL_VERSION_COMPONENT_BITS) \
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| (micro))
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#define COGL_VERSION_GET_MAJOR(version) \
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(((version) >> 20) & COGL_VERSION_MAX_COMPONENT_VALUE)
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#define COGL_VERSION_GET_MINOR(version) \
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(((version) >> 10) & COGL_VERSION_MAX_COMPONENT_VALUE)
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#define COGL_VERSION_GET_MICRO(version) \
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((version) & COGL_VERSION_MAX_COMPONENT_VALUE)
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int
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_cogl_util_next_p2 (int a);
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/* The signbit macro is defined by ISO C99 so it should be available,
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however if it's not we can fallback to an evil hack */
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#ifdef signbit
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#define cogl_util_float_signbit(x) signbit(x)
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#else
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/* This trick was stolen from here:
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http://lists.boost.org/Archives/boost/2006/08/108731.php
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It xors the integer reinterpretations of -1.0f and 1.0f. In theory
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they should only differ by the signbit so that gives a mask for the
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sign which we can just test against the value */
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static inline gboolean
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cogl_util_float_signbit (float x)
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{
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static const union { float f; guint32 i; } negative_one = { -1.0f };
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static const union { float f; guint32 i; } positive_one = { +1.0f };
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union { float f; guint32 i; } value = { x };
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return !!((negative_one.i ^ positive_one.i) & value.i);
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}
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#endif
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/* This is a replacement for the nearbyint function which always
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rounds to the nearest integer. nearbyint is apparently a C99
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function so it might not always be available but also it seems in
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glibc it is defined as a function call so this macro could end up
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faster anyway. We can't just add 0.5f because it will break for
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negative numbers. */
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#define COGL_UTIL_NEARBYINT(x) ((int) ((x) < 0.0f ? (x) - 0.5f : (x) + 0.5f))
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/* Returns whether the given integer is a power of two */
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static inline gboolean
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_cogl_util_is_pot (unsigned int num)
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{
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/* Make sure there is only one bit set */
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return (num & (num - 1)) == 0;
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}
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/* Split Bob Jenkins' One-at-a-Time hash
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*
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* This uses the One-at-a-Time hash algorithm designed by Bob Jenkins
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* but the mixing step is split out so the function can be used in a
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* more incremental fashion.
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*/
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static inline unsigned int
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_cogl_util_one_at_a_time_hash (unsigned int hash,
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const void *key,
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size_t bytes)
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{
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const unsigned char *p = key;
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int i;
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for (i = 0; i < bytes; i++)
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{
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hash += p[i];
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hash += (hash << 10);
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hash ^= (hash >> 6);
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}
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return hash;
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}
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unsigned int
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_cogl_util_one_at_a_time_mix (unsigned int hash);
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/* These two builtins are available since GCC 3.4 */
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#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
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#define COGL_UTIL_HAVE_BUILTIN_FFSL
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#define COGL_UTIL_HAVE_BUILTIN_POPCOUNTL
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#endif
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/* The 'ffs' function is part of C99 so it isn't always available */
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#ifdef HAVE_FFS
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#define _cogl_util_ffs ffs
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#else
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int
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_cogl_util_ffs (int num);
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#endif
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/* The 'ffsl' function is non-standard but GCC has a builtin for it
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since 3.4 which we can use */
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#ifdef COGL_UTIL_HAVE_BUILTIN_FFSL
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#define _cogl_util_ffsl __builtin_ffsl
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#else
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/* If ints and longs are the same size we can just use ffs. Hopefully
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the compiler will optimise away this conditional */
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#define _cogl_util_ffsl(x) \
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(sizeof (long int) == sizeof (int) ? _cogl_util_ffs ((int) x) : \
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_cogl_util_ffsl_wrapper (x))
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int
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_cogl_util_ffsl_wrapper (long int num);
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#endif /* COGL_UTIL_HAVE_BUILTIN_FFSL */
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#ifdef COGL_UTIL_HAVE_BUILTIN_POPCOUNTL
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#define _cogl_util_popcountl __builtin_popcountl
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#else
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extern const unsigned char _cogl_util_popcount_table[256];
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/* There are many ways of doing popcount but doing a table lookup
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seems to be the most robust against different sizes for long. Some
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pages seem to claim it's the fastest method anyway. */
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static inline int
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_cogl_util_popcountl (unsigned long num)
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{
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int i;
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int sum = 0;
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/* Let's hope GCC will unroll this loop.. */
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for (i = 0; i < sizeof (num); i++)
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sum += _cogl_util_popcount_table[(num >> (i * 8)) & 0xff];
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return sum;
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}
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#endif /* COGL_UTIL_HAVE_BUILTIN_POPCOUNTL */
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#ifdef COGL_HAS_GLIB_SUPPORT
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#define _COGL_RETURN_IF_FAIL(EXPR) g_return_if_fail(EXPR)
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#define _COGL_RETURN_VAL_IF_FAIL(EXPR, VAL) g_return_val_if_fail(EXPR, VAL)
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#else
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#define _COGL_RETURN_IF_FAIL(EXPR) do { \
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if (!(EXPR)) \
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{ \
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fprintf (stderr, "file %s: line %d: assertion `%s' failed", \
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__FILE__, \
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__LINE__, \
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#EXPR); \
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return; \
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}; \
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} while(0)
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#define _COGL_RETURN_VAL_IF_FAIL(EXPR, VAL) do { \
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if (!(EXPR)) \
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{ \
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fprintf (stderr, "file %s: line %d: assertion `%s' failed", \
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__FILE__, \
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__LINE__, \
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#EXPR); \
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return (VAL); \
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}; \
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} while(0)
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#endif /* COGL_HAS_GLIB_SUPPORT */
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/* Match a CoglPixelFormat according to channel masks, color depth,
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* bits per pixel and byte order. These information are provided by
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* the Visual and XImage structures.
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*
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* If no specific pixel format could be found, COGL_PIXEL_FORMAT_ANY
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* is returned.
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*/
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CoglPixelFormat
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_cogl_util_pixel_format_from_masks (unsigned long r_mask,
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unsigned long g_mask,
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unsigned long b_mask,
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int depth, int bpp,
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int byte_order);
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#endif /* __COGL_UTIL_H */
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