/** * EGL Configuration (pixel format) functions. */ #include #include #include #include #include "eglconfig.h" #include "egldisplay.h" #include "egldriver.h" #include "eglglobals.h" #define MIN2(A, B) (((A) < (B)) ? (A) : (B)) /** * Convert an _EGLConfig to a __GLcontextModes object. */ static void _eglConfigToContextModesRec(const _EGLConfig *config, __GLcontextModes *mode) { memset(mode, 0, sizeof(*mode)); mode->rgbMode = GL_TRUE; /* no color index */ mode->colorIndexMode = GL_FALSE; mode->doubleBufferMode = GL_TRUE; mode->stereoMode = GL_FALSE; mode->redBits = GET_CONFIG_ATTRIB(config, EGL_RED_SIZE); mode->greenBits = GET_CONFIG_ATTRIB(config, EGL_GREEN_SIZE); mode->blueBits = GET_CONFIG_ATTRIB(config, EGL_BLUE_SIZE); mode->alphaBits = GET_CONFIG_ATTRIB(config, EGL_ALPHA_SIZE); mode->rgbBits = mode->redBits + mode->greenBits + mode->blueBits + mode->alphaBits; mode->depthBits = GET_CONFIG_ATTRIB(config, EGL_DEPTH_SIZE); mode->haveDepthBuffer = mode->depthBits > 0; mode->stencilBits = GET_CONFIG_ATTRIB(config, EGL_STENCIL_SIZE); mode->haveStencilBuffer = mode->stencilBits > 0; mode->level = GET_CONFIG_ATTRIB(config, EGL_LEVEL); mode->samples = GET_CONFIG_ATTRIB(config, EGL_SAMPLES); mode->sampleBuffers = GET_CONFIG_ATTRIB(config, EGL_SAMPLE_BUFFERS); } void _eglSetConfigAttrib(_EGLConfig *config, EGLint attr, EGLint val) { config->Attrib[attr - FIRST_ATTRIB] = val; switch (attr) { case EGL_BUFFER_SIZE: config->glmode.rgbBits = val; break; case EGL_ALPHA_SIZE: config->glmode.alphaBits = val; break; case EGL_BLUE_SIZE: config->glmode.blueBits = val; break; case EGL_GREEN_SIZE: config->glmode.greenBits = val; break; case EGL_RED_SIZE: config->glmode.redBits = val; break; case EGL_DEPTH_SIZE: config->glmode.depthBits = val; break; case EGL_STENCIL_SIZE: config->glmode.stencilBits = val; break; case EGL_CONFIG_CAVEAT: break; case EGL_CONFIG_ID: break; case EGL_LEVEL: break; case EGL_MAX_PBUFFER_HEIGHT: break; case EGL_MAX_PBUFFER_PIXELS: break; case EGL_MAX_PBUFFER_WIDTH: break; case EGL_NATIVE_RENDERABLE: break; case EGL_NATIVE_VISUAL_ID: break; case EGL_NATIVE_VISUAL_TYPE: break; case EGL_SAMPLES: break; case EGL_SAMPLE_BUFFERS: break; case EGL_SURFACE_TYPE: config->glmode.drawableType = val; break; case EGL_TRANSPARENT_TYPE: break; case EGL_TRANSPARENT_BLUE_VALUE: break; case EGL_TRANSPARENT_GREEN_VALUE: break; case EGL_TRANSPARENT_RED_VALUE: break; case EGL_NONE: break; case EGL_BIND_TO_TEXTURE_RGB: break; case EGL_BIND_TO_TEXTURE_RGBA: break; case EGL_MIN_SWAP_INTERVAL: break; case EGL_MAX_SWAP_INTERVAL: break; default: break; } } /** * Init the given _EGLconfig to default values. * \param id the configuration's ID. */ void _eglInitConfig(_EGLConfig *config, EGLint id) { memset(config, 0, sizeof(*config)); config->Handle = id; _eglSetConfigAttrib(config, EGL_CONFIG_ID, id); _eglSetConfigAttrib(config, EGL_BIND_TO_TEXTURE_RGB, EGL_DONT_CARE); _eglSetConfigAttrib(config, EGL_BIND_TO_TEXTURE_RGBA, EGL_DONT_CARE); _eglSetConfigAttrib(config, EGL_CONFIG_CAVEAT, EGL_DONT_CARE); _eglSetConfigAttrib(config, EGL_NATIVE_RENDERABLE, EGL_DONT_CARE); _eglSetConfigAttrib(config, EGL_NATIVE_VISUAL_TYPE, EGL_DONT_CARE); _eglSetConfigAttrib(config, EGL_MIN_SWAP_INTERVAL, EGL_DONT_CARE); _eglSetConfigAttrib(config, EGL_MAX_SWAP_INTERVAL, EGL_DONT_CARE); _eglSetConfigAttrib(config, EGL_SURFACE_TYPE, EGL_SCREEN_BIT_MESA | EGL_PBUFFER_BIT | EGL_PIXMAP_BIT | EGL_WINDOW_BIT); _eglSetConfigAttrib(config, EGL_TRANSPARENT_TYPE, EGL_NONE); _eglSetConfigAttrib(config, EGL_TRANSPARENT_RED_VALUE, EGL_DONT_CARE); _eglSetConfigAttrib(config, EGL_TRANSPARENT_GREEN_VALUE, EGL_DONT_CARE); _eglSetConfigAttrib(config, EGL_TRANSPARENT_BLUE_VALUE, EGL_DONT_CARE); } /** * Given an EGLConfig handle, return the corresponding _EGLConfig object. */ _EGLConfig * _eglLookupConfig(_EGLDriver *drv, EGLDisplay dpy, EGLConfig config) { EGLint i; _EGLDisplay *disp = _eglLookupDisplay(dpy); for (i = 0; i < disp->NumConfigs; i++) { if (disp->Configs[i].Handle == config) { return disp->Configs + i; } } return NULL; } /** * Add the given _EGLConifg to the given display. */ _EGLConfig * _eglAddConfig(_EGLDisplay *display, const _EGLConfig *config) { _EGLConfig *newConfigs; EGLint n; n = display->NumConfigs; newConfigs = (_EGLConfig *) realloc(display->Configs, (n + 1) * sizeof(_EGLConfig)); if (newConfigs) { display->Configs = newConfigs; display->Configs[n] = *config; /* copy struct */ display->Configs[n].Handle = n; display->NumConfigs++; return display->Configs + n; } else { return NULL; } } /** * Parse the attrib_list to fill in the fields of the given _egl_config * Return EGL_FALSE if any errors, EGL_TRUE otherwise. */ EGLBoolean _eglParseConfigAttribs(_EGLConfig *config, const EGLint *attrib_list) { EGLint i; /* XXX set all config attribs to EGL_DONT_CARE */ for (i = 0; attrib_list && attrib_list[i] != EGL_NONE; i++) { EGLint k = attrib_list[i] - FIRST_ATTRIB; if (k >= 0 && k < MAX_ATTRIBS) { config->Attrib[k] = attrib_list[++i]; } else { _eglError(EGL_BAD_ATTRIBUTE, "eglChooseConfig"); return EGL_FALSE; } } return EGL_TRUE; } #define EXACT 1 #define ATLEAST 2 #define MASK 3 #define SMALLER 4 #define SPECIAL 5 #define NONE 6 struct sort_info { EGLint Attribute; EGLint MatchCriteria; EGLint SortOrder; }; /* This encodes the info from Table 3.5 of the EGL spec, ordered by * Sort Priority. */ static struct sort_info SortInfo[] = { { EGL_CONFIG_CAVEAT, EXACT, SPECIAL }, { EGL_RED_SIZE, ATLEAST, SPECIAL }, { EGL_GREEN_SIZE, ATLEAST, SPECIAL }, { EGL_BLUE_SIZE, ATLEAST, SPECIAL }, { EGL_ALPHA_SIZE, ATLEAST, SPECIAL }, { EGL_BUFFER_SIZE, ATLEAST, SMALLER }, { EGL_SAMPLE_BUFFERS, ATLEAST, SMALLER }, { EGL_SAMPLES, ATLEAST, SMALLER }, { EGL_DEPTH_SIZE, ATLEAST, SMALLER }, { EGL_STENCIL_SIZE, ATLEAST, SMALLER }, { EGL_NATIVE_VISUAL_TYPE, EXACT, SPECIAL }, { EGL_CONFIG_ID, EXACT, SMALLER }, { EGL_BIND_TO_TEXTURE_RGB, EXACT, NONE }, { EGL_BIND_TO_TEXTURE_RGBA, EXACT, NONE }, { EGL_LEVEL, EXACT, NONE }, { EGL_NATIVE_RENDERABLE, EXACT, NONE }, { EGL_MAX_SWAP_INTERVAL, EXACT, NONE }, { EGL_MIN_SWAP_INTERVAL, EXACT, NONE }, { EGL_SURFACE_TYPE, MASK, NONE }, { EGL_TRANSPARENT_TYPE, EXACT, NONE }, { EGL_TRANSPARENT_RED_VALUE, EXACT, NONE }, { EGL_TRANSPARENT_GREEN_VALUE, EXACT, NONE }, { EGL_TRANSPARENT_BLUE_VALUE, EXACT, NONE }, { 0, 0, 0 } }; /** * Return EGL_TRUE if the attributes of c meet or exceed the minimums * specified by min. */ EGLBoolean _eglConfigQualifies(const _EGLConfig *c, const _EGLConfig *min) { EGLint i; for (i = 0; SortInfo[i].Attribute != 0; i++) { const EGLint mv = GET_CONFIG_ATTRIB(min, SortInfo[i].Attribute); if (mv != EGL_DONT_CARE) { const EGLint cv = GET_CONFIG_ATTRIB(c, SortInfo[i].Attribute); if (SortInfo[i].MatchCriteria == EXACT) { if (cv != mv) { return EGL_FALSE; } } else if (SortInfo[i].MatchCriteria == ATLEAST) { if (cv < mv) { return EGL_FALSE; } } else { assert(SortInfo[i].MatchCriteria == MASK); if ((mv & cv) != mv) { return EGL_FALSE; } } } } return EGL_TRUE; } /** * Compare configs 'a' and 'b' and return -1 if a belongs before b, * 1 if a belongs after b, or 0 if they're equal. */ EGLint _eglCompareConfigs(const _EGLConfig *a, const _EGLConfig *b) { EGLint i; for (i = 0; SortInfo[i].Attribute != 0; i++) { const EGLint av = GET_CONFIG_ATTRIB(a, SortInfo[i].Attribute); const EGLint bv = GET_CONFIG_ATTRIB(b, SortInfo[i].Attribute); if (SortInfo[i].SortOrder == SMALLER) { if (av < bv) return -1; else if (av > bv) return 1; /* else, continue examining attribute values */ } else if (SortInfo[i].SortOrder == SPECIAL) { if (SortInfo[i].Attribute == EGL_CONFIG_CAVEAT) { /* values are EGL_NONE, SLOW_CONFIG, or NON_CONFORMANT_CONFIG */ if (av < bv) return -1; else if (av > bv) return 1; } else if (SortInfo[i].Attribute == EGL_RED_SIZE || SortInfo[i].Attribute == EGL_GREEN_SIZE || SortInfo[i].Attribute == EGL_BLUE_SIZE || SortInfo[i].Attribute == EGL_ALPHA_SIZE) { if (av > bv) return -1; else if (av < bv) return 1; } else { assert(SortInfo[i].Attribute == EGL_NATIVE_VISUAL_TYPE); if (av < bv) return -1; else if (av > bv) return 1; } } else { assert(SortInfo[i].SortOrder == NONE); /* continue examining attribute values */ } } return 0; } /** * Typical fallback routine for eglChooseConfig */ EGLBoolean _eglChooseConfig(_EGLDriver *drv, EGLDisplay dpy, const EGLint *attrib_list, EGLConfig *configs, EGLint config_size, EGLint *num_config) { _EGLDisplay *disp = _eglLookupDisplay(dpy); _EGLConfig criteria; EGLint i; /* parse the attrib_list to initialize criteria */ if (!_eglParseConfigAttribs(&criteria, attrib_list)) { return EGL_FALSE; } *num_config = 0; for (i = 0; i < disp->NumConfigs; i++) { const _EGLConfig *conf = disp->Configs + i; if (_eglConfigQualifies(conf, &criteria)) { if (*num_config < config_size) { /* save */ configs[*num_config] = conf->Handle; (*num_config)++; } else { break; } } } /* XXX sort the list here */ return EGL_TRUE; } /** * Fallback for eglGetConfigAttrib. */ EGLBoolean _eglGetConfigAttrib(_EGLDriver *drv, EGLDisplay dpy, EGLConfig config, EGLint attribute, EGLint *value) { const _EGLConfig *conf = _eglLookupConfig(drv, dpy, config); const EGLint k = attribute - FIRST_ATTRIB; if (k >= 0 && k < MAX_ATTRIBS) { *value = conf->Attrib[k]; return EGL_TRUE; } else { _eglError(EGL_BAD_ATTRIBUTE, "eglGetConfigAttrib"); return EGL_FALSE; } } /** * Fallback for eglGetConfigs. */ EGLBoolean _eglGetConfigs(_EGLDriver *drv, EGLDisplay dpy, EGLConfig *configs, EGLint config_size, EGLint *num_config) { _EGLDisplay *disp = _eglLookupDisplay(dpy); if (!drv->Initialized) { _eglError(EGL_NOT_INITIALIZED, "eglGetConfigs"); return EGL_FALSE; } if (configs) { EGLint i; *num_config = MIN2(disp->NumConfigs, config_size); for (i = 0; i < *num_config; i++) { configs[i] = disp->Configs[i].Handle; } } else *num_config = disp->NumConfigs; return EGL_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 _eglFillInConfigs(_EGLConfig * configs, 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; _EGLConfig *config; 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; } config = configs; for (k = 0; k < num_depth_stencil_bits; k++) { for (i = 0; i < num_db_modes; i++) { for (j = 0; j < 2; j++) { _eglSetConfigAttrib(config, EGL_RED_SIZE, bits[0]); _eglSetConfigAttrib(config, EGL_GREEN_SIZE, bits[1]); _eglSetConfigAttrib(config, EGL_BLUE_SIZE, bits[2]); _eglSetConfigAttrib(config, EGL_ALPHA_SIZE, bits[3]); config->glmode.redMask = masks[0]; config->glmode.greenMask = masks[1]; config->glmode.blueMask = masks[2]; config->glmode.alphaMask = masks[3]; _eglSetConfigAttrib(config, EGL_BUFFER_SIZE, config->glmode.redBits + config->glmode.greenBits + config->glmode.blueBits + config->glmode.alphaBits); config->glmode.accumRedBits = 16 * j; config->glmode.accumGreenBits = 16 * j; config->glmode.accumBlueBits = 16 * j; config->glmode.accumAlphaBits = (masks[3] != 0) ? 16 * j : 0; config->glmode.visualRating = (j == 0) ? GLX_NONE : GLX_SLOW_CONFIG; _eglSetConfigAttrib(config, EGL_STENCIL_SIZE, stencil_bits[k]); _eglSetConfigAttrib(config, EGL_DEPTH_SIZE, depth_bits[i]); config->glmode.visualType = visType; config->glmode.renderType = GLX_RGBA_BIT; _eglSetConfigAttrib(config, EGL_SURFACE_TYPE, EGL_SCREEN_BIT_MESA | EGL_PBUFFER_BIT | EGL_PIXMAP_BIT | EGL_WINDOW_BIT); config->glmode.rgbMode = GL_TRUE; if (db_modes[i] == GLX_NONE) { config->glmode.doubleBufferMode = GL_FALSE; } else { config->glmode.doubleBufferMode = GL_TRUE; config->glmode.swapMethod = db_modes[i]; } config->glmode.haveAccumBuffer = ((config->glmode.accumRedBits + config->glmode.accumGreenBits + config->glmode.accumBlueBits + config->glmode.accumAlphaBits) > 0); config->glmode.haveDepthBuffer = (config->glmode.depthBits > 0); config->glmode.haveStencilBuffer = (config->glmode.stencilBits > 0); config++; } } } return GL_TRUE; }