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/*
* (C) Copyright IBM Corporation 2002-2006
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* on the rights to use, copy, modify, merge, publish, distribute, sub
* license, and/or sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDERS AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
* USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/**
* \file extension_string.c
* Routines to manage the GLX extension string and GLX version for AIGLX
* drivers. This code is loosely based on src/glx/x11/glxextensions.c from
* Mesa.
*
* \author Ian Romanick <idr@us.ibm.com>
*/
#include <string.h>
#include "extension_string.h"
#define SET_BIT(m,b) (m[ (b) / 8 ] |= (1U << ((b) % 8)))
#define CLR_BIT(m,b) (m[ (b) / 8 ] &= ~(1U << ((b) % 8)))
#define IS_SET(m,b) ((m[ (b) / 8 ] & (1U << ((b) % 8))) != 0)
#define CONCAT(a,b) a ## b
#define GLX(n) "GLX_" # n, 4 + sizeof( # n ) - 1, CONCAT(n,_bit)
#define VER(a,b) a, b
#define Y 1
#define N 0
#define EXT_ENABLED(bit,supported) (IS_SET(supported, bit))
struct extension_info {
const char * const name;
unsigned name_len;
unsigned char bit;
/**
* This is the lowest version of GLX that "requires" this extension.
* For example, GLX 1.3 requires SGIX_fbconfig, SGIX_pbuffer, and
* SGI_make_current_read. If the extension is not required by any known
* version of GLX, use 0, 0.
*/
unsigned char version_major;
unsigned char version_minor;
/**
* Is driver support forced by the ABI?
*/
unsigned char driver_support;
};
static const struct extension_info known_glx_extensions[] = {
/* GLX_ARB_get_proc_address is implemented on the client. */
{ GLX(ARB_multisample), VER(1,4), Y, },
{ GLX(EXT_import_context), VER(0,0), Y, },
{ GLX(EXT_texture_from_pixmap), VER(0,0), Y, },
{ GLX(EXT_visual_info), VER(0,0), Y, },
{ GLX(EXT_visual_rating), VER(0,0), Y, },
{ GLX(MESA_copy_sub_buffer), VER(0,0), N, },
{ GLX(OML_swap_method), VER(0,0), Y, },
{ GLX(SGI_make_current_read), VER(1,3), N, },
{ GLX(SGI_swap_control), VER(0,0), N, },
{ GLX(SGIS_multisample), VER(0,0), Y, },
{ GLX(SGIX_fbconfig), VER(1,3), Y, },
{ GLX(SGIX_pbuffer), VER(1,3), Y, },
{ GLX(SGIX_visual_select_group), VER(0,0), Y, },
{ NULL }
};
/**
* Create a GLX extension string for a set of enable bits.
*
* Creates a GLX extension string for the set of bit in \c enable_bits. This
* string is then stored in \c buffer if buffer is not \c NULL. This allows
* two-pass operation. On the first pass the caller passes \c NULL for
* \c buffer, and the function determines how much space is required to store
* the extension string. The caller allocates the buffer and calls the
* function again.
*
* \param enable_bits Bits representing the enabled extensions.
* \param buffer Buffer to store the extension string. May be \c NULL.
*
* \return
* The number of characters in \c buffer that were written to. If \c buffer
* is \c NULL, this is the size of buffer that must be allocated by the
* caller.
*/
int
__glXGetExtensionString(const unsigned char *enable_bits, char *buffer)
{
unsigned i;
int length = 0;
for (i = 0; known_glx_extensions[i].name != NULL; i++) {
const unsigned bit = known_glx_extensions[i].bit;
const size_t len = known_glx_extensions[i].name_len;
if (EXT_ENABLED(bit, enable_bits)) {
if (buffer != NULL) {
(void) memcpy(& buffer[length], known_glx_extensions[i].name,
len);
buffer[length + len + 0] = ' ';
buffer[length + len + 1] = '\0';
}
length += len + 1;
}
}
return length + 1;
}
void
__glXEnableExtension(unsigned char *enable_bits, const char *ext)
{
const size_t ext_name_len = strlen(ext);
unsigned i;
for (i = 0; known_glx_extensions[i].name != NULL; i++) {
if ((ext_name_len == known_glx_extensions[i].name_len)
&& (memcmp(ext, known_glx_extensions[i].name, ext_name_len) == 0)) {
SET_BIT(enable_bits, known_glx_extensions[i].bit);
break;
}
}
}
void
__glXInitExtensionEnableBits(unsigned char *enable_bits)
{
unsigned i;
(void) memset(enable_bits, 0, __GLX_EXT_BYTES);
for (i = 0; known_glx_extensions[i].name != NULL; i++) {
if (known_glx_extensions[i].driver_support) {
SET_BIT(enable_bits, known_glx_extensions[i].bit);
}
}
}
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