178 lines
6.2 KiB
C
178 lines
6.2 KiB
C
/*
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* (C) Copyright IBM Corporation 2002-2006
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* on the rights to use, copy, modify, merge, publish, distribute, sub
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* license, and/or sell copies of the Software, and to permit persons to whom
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* the Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/**
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* \file extension_string.c
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* Routines to manage the GLX extension string and GLX version for AIGLX
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* drivers. This code is loosely based on src/glx/x11/glxextensions.c from
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* Mesa.
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*
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* \author Ian Romanick <idr@us.ibm.com>
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*/
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#include <string.h>
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#include "extension_string.h"
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#define SET_BIT(m,b) (m[ (b) / 8 ] |= (1U << ((b) % 8)))
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#define CLR_BIT(m,b) (m[ (b) / 8 ] &= ~(1U << ((b) % 8)))
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#define IS_SET(m,b) ((m[ (b) / 8 ] & (1U << ((b) % 8))) != 0)
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#define CONCAT(a,b) a ## b
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#define GLX(n) "GLX_" # n, 4 + sizeof( # n ) - 1, CONCAT(n,_bit)
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#define VER(a,b) a, b
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#define Y 1
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#define N 0
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#define EXT_ENABLED(bit,supported) (IS_SET(supported, bit))
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struct extension_info {
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const char *const name;
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unsigned name_len;
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unsigned char bit;
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/**
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* This is the lowest version of GLX that "requires" this extension.
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* For example, GLX 1.3 requires SGIX_fbconfig, SGIX_pbuffer, and
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* SGI_make_current_read. If the extension is not required by any known
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* version of GLX, use 0, 0.
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*/
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unsigned char version_major;
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unsigned char version_minor;
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/**
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* Is driver support forced by the ABI?
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*/
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unsigned char driver_support;
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};
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/**
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* List of known GLX Extensions.
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* The last Y/N switch informs whether the support of this extension is always enabled.
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*/
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static const struct extension_info known_glx_extensions[] = {
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/* GLX_ARB_get_proc_address is implemented on the client. */
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/* *INDENT-OFF* */
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{ GLX(ARB_context_flush_control), VER(0,0), N, },
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{ GLX(ARB_create_context), VER(0,0), N, },
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{ GLX(ARB_create_context_profile), VER(0,0), N, },
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{ GLX(ARB_create_context_robustness), VER(0,0), N, },
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{ GLX(ARB_fbconfig_float), VER(0,0), N, },
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{ GLX(ARB_framebuffer_sRGB), VER(0,0), N, },
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{ GLX(ARB_multisample), VER(1,4), Y, },
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{ GLX(EXT_create_context_es_profile), VER(0,0), N, },
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{ GLX(EXT_create_context_es2_profile), VER(0,0), N, },
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{ GLX(EXT_fbconfig_packed_float), VER(0,0), N, },
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{ GLX(EXT_framebuffer_sRGB), VER(0,0), N, },
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{ GLX(EXT_import_context), VER(0,0), Y, },
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{ GLX(EXT_stereo_tree), VER(0,0), N, },
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{ GLX(EXT_texture_from_pixmap), VER(0,0), Y, },
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{ GLX(EXT_visual_info), VER(0,0), Y, },
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{ GLX(EXT_visual_rating), VER(0,0), Y, },
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{ GLX(MESA_copy_sub_buffer), VER(0,0), N, },
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{ GLX(OML_swap_method), VER(0,0), Y, },
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{ GLX(SGI_make_current_read), VER(1,3), N, },
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{ GLX(SGI_swap_control), VER(0,0), N, },
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{ GLX(SGIS_multisample), VER(0,0), Y, },
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{ GLX(SGIX_fbconfig), VER(1,3), Y, },
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{ GLX(SGIX_pbuffer), VER(1,3), Y, },
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{ GLX(SGIX_visual_select_group), VER(0,0), Y, },
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{ GLX(INTEL_swap_event), VER(0,0), N, },
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{ NULL }
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/* *INDENT-ON* */
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};
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/**
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* Create a GLX extension string for a set of enable bits.
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*
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* Creates a GLX extension string for the set of bit in \c enable_bits. This
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* string is then stored in \c buffer if buffer is not \c NULL. This allows
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* two-pass operation. On the first pass the caller passes \c NULL for
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* \c buffer, and the function determines how much space is required to store
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* the extension string. The caller allocates the buffer and calls the
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* function again.
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*
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* \param enable_bits Bits representing the enabled extensions.
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* \param buffer Buffer to store the extension string. May be \c NULL.
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*
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* \return
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* The number of characters in \c buffer that were written to. If \c buffer
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* is \c NULL, this is the size of buffer that must be allocated by the
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* caller.
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*/
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int
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__glXGetExtensionString(const unsigned char *enable_bits, char *buffer)
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{
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unsigned i;
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int length = 0;
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for (i = 0; known_glx_extensions[i].name != NULL; i++) {
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const unsigned bit = known_glx_extensions[i].bit;
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const size_t len = known_glx_extensions[i].name_len;
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if (EXT_ENABLED(bit, enable_bits)) {
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if (buffer != NULL) {
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(void) memcpy(&buffer[length], known_glx_extensions[i].name,
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len);
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buffer[length + len + 0] = ' ';
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buffer[length + len + 1] = '\0';
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}
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length += len + 1;
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}
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}
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return length + 1;
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}
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void
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__glXEnableExtension(unsigned char *enable_bits, const char *ext)
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{
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const size_t ext_name_len = strlen(ext);
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unsigned i;
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for (i = 0; known_glx_extensions[i].name != NULL; i++) {
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if ((ext_name_len == known_glx_extensions[i].name_len)
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&& (memcmp(ext, known_glx_extensions[i].name, ext_name_len) == 0)) {
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SET_BIT(enable_bits, known_glx_extensions[i].bit);
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break;
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}
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}
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}
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void
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__glXInitExtensionEnableBits(unsigned char *enable_bits)
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{
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unsigned i;
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(void) memset(enable_bits, 0, __GLX_EXT_BYTES);
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for (i = 0; known_glx_extensions[i].name != NULL; i++) {
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if (known_glx_extensions[i].driver_support) {
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SET_BIT(enable_bits, known_glx_extensions[i].bit);
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}
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}
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}
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