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+/*
+ * (C) Copyright IBM Corporation 2002, 2004
+ * 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
+ * VA LINUX SYSTEM, IBM 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 utils.c
+ * Utility functions for DRI drivers.
+ *
+ * \author Ian Romanick <idr@us.ibm.com>
+ */
+
+#include <string.h>
+#include <stdlib.h>
+#include "mtypes.h"
+#include "extensions.h"
+#include "utils.h"
+#include "dispatch.h"
+
+int driDispatchRemapTable[ driDispatchRemapTable_size ];
+
+#if defined(USE_X86_ASM)
+#include "x86/common_x86_asm.h"
+#endif
+
+#if defined(USE_PPC_ASM)
+#include "ppc/common_ppc_features.h"
+#endif
+
+unsigned
+driParseDebugString( const char * debug,
+ const struct dri_debug_control * control )
+{
+ unsigned flag;
+
+
+ flag = 0;
+ if ( debug != NULL ) {
+ while( control->string != NULL ) {
+ if ( !strcmp( debug, "all" ) ||
+ strstr( debug, control->string ) != NULL ) {
+ flag |= control->flag;
+ }
+
+ control++;
+ }
+ }
+
+ return flag;
+}
+
+
+
+/**
+ * Create the \c GL_RENDERER string for DRI drivers.
+ *
+ * Almost all DRI drivers use a \c GL_RENDERER string of the form:
+ *
+ * "Mesa DRI <chip> <driver date> <AGP speed) <CPU information>"
+ *
+ * Using the supplied chip name, driver data, and AGP speed, this function
+ * creates the string.
+ *
+ * \param buffer Buffer to hold the \c GL_RENDERER string.
+ * \param hardware_name Name of the hardware.
+ * \param driver_date Driver date.
+ * \param agp_mode AGP mode (speed).
+ *
+ * \returns
+ * The length of the string stored in \c buffer. This does \b not include
+ * the terminating \c NUL character.
+ */
+unsigned
+driGetRendererString( char * buffer, const char * hardware_name,
+ const char * driver_date, GLuint agp_mode )
+{
+#define MAX_INFO 4
+ const char * cpu[MAX_INFO];
+ unsigned next = 0;
+ unsigned i;
+ unsigned offset;
+
+
+ offset = sprintf( buffer, "Mesa DRI %s %s", hardware_name, driver_date );
+
+ /* Append any AGP-specific information.
+ */
+ switch ( agp_mode ) {
+ case 1:
+ case 2:
+ case 4:
+ case 8:
+ offset += sprintf( & buffer[ offset ], " AGP %ux", agp_mode );
+ break;
+
+ default:
+ break;
+ }
+
+ /* Append any CPU-specific information.
+ */
+#ifdef USE_X86_ASM
+ if ( _mesa_x86_cpu_features ) {
+ cpu[next] = " x86";
+ next++;
+ }
+# ifdef USE_MMX_ASM
+ if ( cpu_has_mmx ) {
+ cpu[next] = (cpu_has_mmxext) ? "/MMX+" : "/MMX";
+ next++;
+ }
+# endif
+# ifdef USE_3DNOW_ASM
+ if ( cpu_has_3dnow ) {
+ cpu[next] = (cpu_has_3dnowext) ? "/3DNow!+" : "/3DNow!";
+ next++;
+ }
+# endif
+# ifdef USE_SSE_ASM
+ if ( cpu_has_xmm ) {
+ cpu[next] = (cpu_has_xmm2) ? "/SSE2" : "/SSE";
+ next++;
+ }
+# endif
+
+#elif defined(USE_SPARC_ASM)
+
+ cpu[0] = " SPARC";
+ next = 1;
+
+#elif defined(USE_PPC_ASM)
+ if ( _mesa_ppc_cpu_features ) {
+ cpu[next] = (cpu_has_64) ? " PowerPC 64" : " PowerPC";
+ next++;
+ }
+
+# ifdef USE_VMX_ASM
+ if ( cpu_has_vmx ) {
+ cpu[next] = "/Altivec";
+ next++;
+ }
+# endif
+
+ if ( ! cpu_has_fpu ) {
+ cpu[next] = "/No FPU";
+ next++;
+ }
+#endif
+
+ for ( i = 0 ; i < next ; i++ ) {
+ const size_t len = strlen( cpu[i] );
+
+ strncpy( & buffer[ offset ], cpu[i], len );
+ offset += len;
+ }
+
+ return offset;
+}
+
+
+
+
+#define need_GL_ARB_multisample
+#define need_GL_ARB_transpose_matrix
+#define need_GL_ARB_window_pos
+#define need_GL_EXT_compiled_vertex_array
+#define need_GL_EXT_polygon_offset
+#define need_GL_EXT_texture_object
+#define need_GL_EXT_vertex_array
+#define need_GL_MESA_window_pos
+
+/* These are needed in *all* drivers because Mesa internally implements
+ * certain functionality in terms of functions provided by these extensions.
+ * For example, glBlendFunc is implemented by calling glBlendFuncSeparateEXT.
+ */
+#define need_GL_EXT_blend_func_separate
+#define need_GL_NV_vertex_program
+
+#include "extension_helper.h"
+
+static const struct dri_extension all_mesa_extensions[] = {
+ { "GL_ARB_multisample", GL_ARB_multisample_functions },
+ { "GL_ARB_transpose_matrix", GL_ARB_transpose_matrix_functions },
+ { "GL_ARB_window_pos", GL_ARB_window_pos_functions },
+ { "GL_EXT_blend_func_separate", GL_EXT_blend_func_separate_functions },
+ { "GL_EXT_compiled_vertex_array", GL_EXT_compiled_vertex_array_functions },
+ { "GL_EXT_polygon_offset", GL_EXT_polygon_offset_functions },
+ { "GL_EXT_texture_object", GL_EXT_texture_object_functions },
+ { "GL_EXT_vertex_array", GL_EXT_vertex_array_functions },
+ { "GL_MESA_window_pos", GL_MESA_window_pos_functions },
+ { "GL_NV_vertex_program", GL_NV_vertex_program_functions },
+ { NULL, NULL }
+};
+
+
+/**
+ * Enable extensions supported by the driver.
+ *
+ * \bug
+ * ARB_imaging isn't handled properly. In Mesa, enabling ARB_imaging also
+ * enables all the sub-extensions that are folded into it. This means that
+ * we need to add entry-points (via \c driInitSingleExtension) for those
+ * new functions here.
+ */
+void driInitExtensions( GLcontext * ctx,
+ const struct dri_extension * extensions_to_enable,
+ GLboolean enable_imaging )
+{
+ static int first_time = 1;
+ unsigned i;
+
+ if ( first_time ) {
+ for ( i = 0 ; i < driDispatchRemapTable_size ; i++ ) {
+ driDispatchRemapTable[i] = -1;
+ }
+
+ first_time = 0;
+ driInitExtensions( ctx, all_mesa_extensions, GL_FALSE );
+ }
+
+ if ( (ctx != NULL) && enable_imaging ) {
+ _mesa_enable_imaging_extensions( ctx );
+ }
+
+ for ( i = 0 ; extensions_to_enable[i].name != NULL ; i++ ) {
+ driInitSingleExtension( ctx, & extensions_to_enable[i] );
+ }
+}
+
+
+
+
+/**
+ * Enable and add dispatch functions for a single extension
+ *
+ * \param ctx Context where extension is to be enabled.
+ * \param ext Extension that is to be enabled.
+ *
+ * \sa driInitExtensions, _mesa_enable_extension, _glapi_add_entrypoint
+ *
+ * \todo
+ * Determine if it would be better to use \c strlen instead of the hardcoded
+ * for-loops.
+ */
+void driInitSingleExtension( GLcontext * ctx,
+ const struct dri_extension * ext )
+{
+ unsigned i;
+
+
+ if ( ext->functions != NULL ) {
+ for ( i = 0 ; ext->functions[i].strings != NULL ; i++ ) {
+ const char * functions[16];
+ const char * parameter_signature;
+ const char * str = ext->functions[i].strings;
+ unsigned j;
+ unsigned offset;
+
+
+ /* Separate the parameter signature from the rest of the string.
+ * If the parameter signature is empty (i.e., the string starts
+ * with a NUL character), then the function has a void parameter
+ * list.
+ */
+ parameter_signature = str;
+ while ( str[0] != '\0' ) {
+ str++;
+ }
+ str++;
+
+
+ /* Divide the string into the substrings that name each
+ * entry-point for the function.
+ */
+ for ( j = 0 ; j < 16 ; j++ ) {
+ if ( str[0] == '\0' ) {
+ functions[j] = NULL;
+ break;
+ }
+
+ functions[j] = str;
+
+ while ( str[0] != '\0' ) {
+ str++;
+ }
+ str++;
+ }
+
+
+ /* Add each entry-point to the dispatch table.
+ */
+ offset = _glapi_add_dispatch( functions, parameter_signature );
+ if (offset == -1) {
+ fprintf(stderr, "DISPATCH ERROR! _glapi_add_dispatch failed "
+ "to add %s!\n", functions[0]);
+ }
+ else if (ext->functions[i].remap_index != -1) {
+ driDispatchRemapTable[ ext->functions[i].remap_index ] =
+ offset;
+ }
+ else if (ext->functions[i].offset != offset) {
+ fprintf(stderr, "DISPATCH ERROR! %s -> %u != %u\n",
+ functions[0], offset, ext->functions[i].offset);
+ }
+ }
+ }
+
+ if ( ctx != NULL ) {
+ _mesa_enable_extension( ctx, ext->name );
+ }
+}
+
+
+/**
+ * Utility function used by drivers to test the verions of other components.
+ *
+ * If one of the version requirements is not met, a message is logged using
+ * \c __driUtilMessage.
+ *
+ * \param driver_name Name of the driver. Used in error messages.
+ * \param driActual Actual DRI version supplied __driCreateNewScreen.
+ * \param driExpected Minimum DRI version required by the driver.
+ * \param ddxActual Actual DDX version supplied __driCreateNewScreen.
+ * \param ddxExpected Minimum DDX minor and range of DDX major version required by the driver.
+ * \param drmActual Actual DRM version supplied __driCreateNewScreen.
+ * \param drmExpected Minimum DRM version required by the driver.
+ *
+ * \returns \c GL_TRUE if all version requirements are met. Otherwise,
+ * \c GL_FALSE is returned.
+ *
+ * \sa __driCreateNewScreen, driCheckDriDdxDrmVersions2, __driUtilMessage
+ *
+ * \todo
+ * Now that the old \c driCheckDriDdxDrmVersions function is gone, this
+ * function and \c driCheckDriDdxDrmVersions2 should be renamed.
+ */
+GLboolean
+driCheckDriDdxDrmVersions3(const char * driver_name,
+ const __DRIversion * driActual,
+ const __DRIversion * driExpected,
+ const __DRIversion * ddxActual,
+ const __DRIutilversion2 * ddxExpected,
+ const __DRIversion * drmActual,
+ const __DRIversion * drmExpected)
+{
+ static const char format[] = "%s DRI driver expected %s version %d.%d.x "
+ "but got version %d.%d.%d\n";
+ static const char format2[] = "%s DRI driver expected %s version %d-%d.%d.x "
+ "but got version %d.%d.%d\n";
+
+
+ /* Check the DRI version */
+ if ( (driActual->major != driExpected->major)
+ || (driActual->minor < driExpected->minor) ) {
+ fprintf(stderr, format, driver_name, "DRI",
+ driExpected->major, driExpected->minor,
+ driActual->major, driActual->minor, driActual->patch);
+ return GL_FALSE;
+ }
+
+ /* Check that the DDX driver version is compatible */
+ /* for miniglx we pass in -1 so we can ignore the DDX version */
+ if ( (ddxActual->major != -1) && ((ddxActual->major < ddxExpected->major_min)
+ || (ddxActual->major > ddxExpected->major_max)
+ || (ddxActual->minor < ddxExpected->minor)) ) {
+ fprintf(stderr, format2, driver_name, "DDX",
+ ddxExpected->major_min, ddxExpected->major_max, ddxExpected->minor,
+ ddxActual->major, ddxActual->minor, ddxActual->patch);
+ return GL_FALSE;
+ }
+
+ /* Check that the DRM driver version is compatible */
+ if ( (drmActual->major != drmExpected->major)
+ || (drmActual->minor < drmExpected->minor) ) {
+ fprintf(stderr, format, driver_name, "DRM",
+ drmExpected->major, drmExpected->minor,
+ drmActual->major, drmActual->minor, drmActual->patch);
+ return GL_FALSE;
+ }
+
+ return GL_TRUE;
+}
+
+GLboolean
+driCheckDriDdxDrmVersions2(const char * driver_name,
+ const __DRIversion * driActual,
+ const __DRIversion * driExpected,
+ const __DRIversion * ddxActual,
+ const __DRIversion * ddxExpected,
+ const __DRIversion * drmActual,
+ const __DRIversion * drmExpected)
+{
+ __DRIutilversion2 ddx_expected;
+ ddx_expected.major_min = ddxExpected->major;
+ ddx_expected.major_max = ddxExpected->major;
+ ddx_expected.minor = ddxExpected->minor;
+ ddx_expected.patch = ddxExpected->patch;
+ return driCheckDriDdxDrmVersions3(driver_name, driActual,
+ driExpected, ddxActual, & ddx_expected,
+ drmActual, drmExpected);
+}
+
+
+
+GLboolean driClipRectToFramebuffer( const GLframebuffer *buffer,
+ GLint *x, GLint *y,
+ GLsizei *width, GLsizei *height )
+{
+ /* left clipping */
+ if (*x < buffer->_Xmin) {
+ *width -= (buffer->_Xmin - *x);
+ *x = buffer->_Xmin;
+ }
+
+ /* right clipping */
+ if (*x + *width > buffer->_Xmax)
+ *width -= (*x + *width - buffer->_Xmax - 1);
+
+ if (*width <= 0)
+ return GL_FALSE;
+
+ /* bottom clipping */
+ if (*y < buffer->_Ymin) {
+ *height -= (buffer->_Ymin - *y);
+ *y = buffer->_Ymin;
+ }
+
+ /* top clipping */
+ if (*y + *height > buffer->_Ymax)
+ *height -= (*y + *height - buffer->_Ymax - 1);
+
+ if (*height <= 0)
+ return GL_FALSE;
+
+ return GL_TRUE;
+}
+
+
+
+/**
+ * Creates a set of \c __GLcontextModes that a driver will expose.
+ *
+ * A set of \c __GLcontextModes will be created based on the supplied
+ * parameters. The number of modes processed will be 2 *
+ * \c num_depth_stencil_bits * \c num_db_modes.
+ *
+ * For the most part, data is just copied from \c depth_bits, \c stencil_bits,
+ * \c db_modes, and \c visType into each \c __GLcontextModes element.
+ * However, the meanings of \c fb_format and \c fb_type require further
+ * explanation. The \c fb_format specifies which color components are in
+ * each pixel and what the default order is. For example, \c GL_RGB specifies
+ * that red, green, blue are available and red is in the "most significant"
+ * position and blue is in the "least significant". The \c fb_type specifies
+ * the bit sizes of each component and the actual ordering. For example, if
+ * \c GL_UNSIGNED_SHORT_5_6_5_REV is specified with \c GL_RGB, bits [15:11]
+ * are the blue value, bits [10:5] are the green value, and bits [4:0] are
+ * the red value.
+ *
+ * One sublte issue is the combination of \c GL_RGB or \c GL_BGR and either
+ * of the \c GL_UNSIGNED_INT_8_8_8_8 modes. The resulting mask values in the
+ * \c __GLcontextModes structure is \b identical to the \c GL_RGBA or
+ * \c GL_BGRA case, except the \c alphaMask is zero. This means that, as
+ * far as this routine is concerned, \c GL_RGB with \c GL_UNSIGNED_INT_8_8_8_8
+ * still uses 32-bits.
+ *
+ * If in doubt, look at the tables used in the function.
+ *
+ * \param ptr_to_modes Pointer to a pointer to a linked list of
+ * \c __GLcontextModes. Upon completion, a pointer to
+ * the next element to be process will be stored here.
+ * If the function fails and returns \c GL_FALSE, this
+ * value will be unmodified, but some elements in the
+ * linked list may be modified.
+ * \param fb_format Format of the framebuffer. Currently only \c GL_RGB,
+ * \c GL_RGBA, \c GL_BGR, and \c GL_BGRA are supported.
+ * \param fb_type Type of the pixels in the framebuffer. Currently only
+ * \c GL_UNSIGNED_SHORT_5_6_5,
+ * \c GL_UNSIGNED_SHORT_5_6_5_REV,
+ * \c GL_UNSIGNED_INT_8_8_8_8, and
+ * \c GL_UNSIGNED_INT_8_8_8_8_REV are supported.
+ * \param depth_bits Array of depth buffer sizes to be exposed.
+ * \param stencil_bits Array of stencil buffer sizes to be exposed.
+ * \param num_depth_stencil_bits Number of entries in both \c depth_bits and
+ * \c stencil_bits.
+ * \param db_modes Array of buffer swap modes. If an element has a
+ * value of \c GLX_NONE, then it represents a
+ * single-buffered mode. Other valid values are
+ * \c GLX_SWAP_EXCHANGE_OML, \c GLX_SWAP_COPY_OML, and
+ * \c GLX_SWAP_UNDEFINED_OML. See the
+ * GLX_OML_swap_method extension spec for more details.
+ * \param num_db_modes Number of entries in \c db_modes.
+ * \param visType GLX visual type. Usually either \c GLX_TRUE_COLOR or
+ * \c GLX_DIRECT_COLOR.
+ *
+ * \returns
+ * \c GL_TRUE on success or \c GL_FALSE on failure. Currently the only
+ * cause of failure is a bad parameter (i.e., unsupported \c fb_format or
+ * \c fb_type).
+ *
+ * \todo
+ * There is currently no way to support packed RGB modes (i.e., modes with
+ * exactly 3 bytes per pixel) or floating-point modes. This could probably
+ * be done by creating some new, private enums with clever names likes
+ * \c GL_UNSIGNED_3BYTE_8_8_8, \c GL_4FLOAT_32_32_32_32,
+ * \c GL_4HALF_16_16_16_16, etc. We can cross that bridge when we come to it.
+ */
+GLboolean
+driFillInModes( __GLcontextModes ** ptr_to_modes,
+ GLenum fb_format, GLenum fb_type,
+ const u_int8_t * depth_bits, const u_int8_t * stencil_bits,
+ unsigned num_depth_stencil_bits,
+ const GLenum * db_modes, unsigned num_db_modes,
+ int visType )
+{
+ static const u_int8_t bits_table[3][4] = {
+ /* R G B A */
+ { 5, 6, 5, 0 }, /* Any GL_UNSIGNED_SHORT_5_6_5 */
+ { 8, 8, 8, 0 }, /* Any RGB with any GL_UNSIGNED_INT_8_8_8_8 */
+ { 8, 8, 8, 8 } /* Any RGBA with any GL_UNSIGNED_INT_8_8_8_8 */
+ };
+
+ /* The following arrays are all indexed by the fb_type masked with 0x07.
+ * Given the four supported fb_type values, this results in valid array
+ * indices of 3, 4, 5, and 7.
+ */
+ static const u_int32_t masks_table_rgb[8][4] = {
+ { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
+ { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
+ { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
+ { 0x0000F800, 0x000007E0, 0x0000001F, 0x00000000 }, /* 5_6_5 */
+ { 0x0000001F, 0x000007E0, 0x0000F800, 0x00000000 }, /* 5_6_5_REV */
+ { 0xFF000000, 0x00FF0000, 0x0000FF00, 0x00000000 }, /* 8_8_8_8 */
+ { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
+ { 0x000000FF, 0x0000FF00, 0x00FF0000, 0x00000000 } /* 8_8_8_8_REV */
+ };
+
+ static const u_int32_t masks_table_rgba[8][4] = {
+ { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
+ { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
+ { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
+ { 0x0000F800, 0x000007E0, 0x0000001F, 0x00000000 }, /* 5_6_5 */
+ { 0x0000001F, 0x000007E0, 0x0000F800, 0x00000000 }, /* 5_6_5_REV */
+ { 0xFF000000, 0x00FF0000, 0x0000FF00, 0x000000FF }, /* 8_8_8_8 */
+ { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
+ { 0x000000FF, 0x0000FF00, 0x00FF0000, 0xFF000000 }, /* 8_8_8_8_REV */
+ };
+
+ static const u_int32_t masks_table_bgr[8][4] = {
+ { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
+ { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
+ { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
+ { 0x0000001F, 0x000007E0, 0x0000F800, 0x00000000 }, /* 5_6_5 */
+ { 0x0000F800, 0x000007E0, 0x0000001F, 0x00000000 }, /* 5_6_5_REV */
+ { 0x0000FF00, 0x00FF0000, 0xFF000000, 0x00000000 }, /* 8_8_8_8 */
+ { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
+ { 0x00FF0000, 0x0000FF00, 0x000000FF, 0x00000000 }, /* 8_8_8_8_REV */
+ };
+
+ static const u_int32_t masks_table_bgra[8][4] = {
+ { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
+ { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
+ { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
+ { 0x0000001F, 0x000007E0, 0x0000F800, 0x00000000 }, /* 5_6_5 */
+ { 0x0000F800, 0x000007E0, 0x0000001F, 0x00000000 }, /* 5_6_5_REV */
+ { 0x0000FF00, 0x00FF0000, 0xFF000000, 0x000000FF }, /* 8_8_8_8 */
+ { 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
+ { 0x00FF0000, 0x0000FF00, 0x000000FF, 0xFF000000 }, /* 8_8_8_8_REV */
+ };
+
+ static const u_int8_t bytes_per_pixel[8] = {
+ 0, 0, 0, 2, 2, 4, 0, 4
+ };
+
+ const u_int8_t * bits;
+ const u_int32_t * masks;
+ const int index = fb_type & 0x07;
+ __GLcontextModes * modes = *ptr_to_modes;
+ unsigned i;
+ unsigned j;
+ unsigned k;
+
+
+ if ( bytes_per_pixel[ index ] == 0 ) {
+ fprintf( stderr, "[%s:%u] Framebuffer type 0x%04x has 0 bytes per pixel.\n",
+ __FUNCTION__, __LINE__, fb_type );
+ return GL_FALSE;
+ }
+
+
+ /* Valid types are GL_UNSIGNED_SHORT_5_6_5 and GL_UNSIGNED_INT_8_8_8_8 and
+ * the _REV versions.
+ *
+ * Valid formats are GL_RGBA, GL_RGB, and GL_BGRA.
+ */
+
+ switch ( fb_format ) {
+ case GL_RGB:
+ bits = (bytes_per_pixel[ index ] == 2)
+ ? bits_table[0] : bits_table[1];
+ masks = masks_table_rgb[ index ];
+ break;
+
+ case GL_RGBA:
+ bits = (bytes_per_pixel[ index ] == 2)
+ ? bits_table[0] : bits_table[2];
+ masks = masks_table_rgba[ index ];
+ break;
+
+ case GL_BGR:
+ bits = (bytes_per_pixel[ index ] == 2)
+ ? bits_table[0] : bits_table[1];
+ masks = masks_table_bgr[ index ];
+ break;
+
+ case GL_BGRA:
+ bits = (bytes_per_pixel[ index ] == 2)
+ ? bits_table[0] : bits_table[2];
+ masks = masks_table_bgra[ index ];
+ break;
+
+ default:
+ fprintf( stderr, "[%s:%u] Framebuffer format 0x%04x is not GL_RGB, GL_RGBA, GL_BGR, or GL_BGRA.\n",
+ __FUNCTION__, __LINE__, fb_format );
+ return GL_FALSE;
+ }
+
+
+ for ( k = 0 ; k < num_depth_stencil_bits ; k++ ) {
+ for ( i = 0 ; i < num_db_modes ; i++ ) {
+ for ( j = 0 ; j < 2 ; j++ ) {
+
+ modes->redBits = bits[0];
+ modes->greenBits = bits[1];
+ modes->blueBits = bits[2];
+ modes->alphaBits = bits[3];
+ modes->redMask = masks[0];
+ modes->greenMask = masks[1];
+ modes->blueMask = masks[2];
+ modes->alphaMask = masks[3];
+ modes->rgbBits = modes->redBits + modes->greenBits
+ + modes->blueBits + modes->alphaBits;
+
+ modes->accumRedBits = 16 * j;
+ modes->accumGreenBits = 16 * j;
+ modes->accumBlueBits = 16 * j;
+ modes->accumAlphaBits = (masks[3] != 0) ? 16 * j : 0;
+ modes->visualRating = (j == 0) ? GLX_NONE : GLX_SLOW_CONFIG;
+
+ modes->stencilBits = stencil_bits[k];
+ modes->depthBits = depth_bits[k];
+
+ modes->visualType = visType;
+ modes->renderType = GLX_RGBA_BIT;
+ modes->drawableType = GLX_WINDOW_BIT;
+ modes->rgbMode = GL_TRUE;
+
+ if ( db_modes[i] == GLX_NONE ) {
+ modes->doubleBufferMode = GL_FALSE;
+ }
+ else {
+ modes->doubleBufferMode = GL_TRUE;
+ modes->swapMethod = db_modes[i];
+ }
+
+ modes->haveAccumBuffer = ((modes->accumRedBits +
+ modes->accumGreenBits +
+ modes->accumBlueBits +
+ modes->accumAlphaBits) > 0);
+ modes->haveDepthBuffer = (modes->depthBits > 0);
+ modes->haveStencilBuffer = (modes->stencilBits > 0);
+
+ modes = modes->next;
+ }
+ }
+ }
+
+ *ptr_to_modes = modes;
+ return GL_TRUE;
+}