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Diffstat (limited to 'glx/extension_string.c')
| -rw-r--r-- | glx/extension_string.c | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/glx/extension_string.c b/glx/extension_string.c new file mode 100644 index 000000000..a4b202af3 --- /dev/null +++ b/glx/extension_string.c @@ -0,0 +1,165 @@ +/* + * (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), N, }, + { 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); + } + } +} |