EGLconfig vs __GLcontextModes
Jon Smirl
jonsmirl at gmail.com
Wed May 11 09:59:31 PDT 2005
I'm trying to get the egl demo code working on the dumb framebuffer.
To implement this I need to reconcile EGLconfig vs __GLcontextModes
since all of the mesa code wants __GLcontextModes and not EGLconfig.
Am I on the right track in _eglSetConfigAtrib()? How should all of the
cases be filled out?
How do we deal with EGLconfig being a subset of __GLcontextModes?
The config code is below. I attached a few relevant files in case the
formatting gets screwed up from gmail.
--
Jon Smirl
jonsmirl at gmail.com
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include "eglconfig.h"
#include "egldisplay.h"
#include "egldriver.h"
#include "eglglobals.h"
#define MIN2(A, B) (((A) < (B)) ? (A) : (B))
/**
* 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;
_eglSetConfigAtrib(config, EGL_CONFIG_ID, id);
_eglSetConfigAtrib(config, EGL_BIND_TO_TEXTURE_RGB, EGL_DONT_CARE);
_eglSetConfigAtrib(config, EGL_BIND_TO_TEXTURE_RGBA, EGL_DONT_CARE);
_eglSetConfigAtrib(config, EGL_CONFIG_CAVEAT, EGL_DONT_CARE);
_eglSetConfigAtrib(config, EGL_NATIVE_RENDERABLE, EGL_DONT_CARE);
_eglSetConfigAtrib(config, EGL_NATIVE_VISUAL_TYPE, EGL_DONT_CARE);
_eglSetConfigAtrib(config, EGL_MIN_SWAP_INTERVAL, EGL_DONT_CARE);
_eglSetConfigAtrib(config, EGL_MAX_SWAP_INTERVAL, EGL_DONT_CARE);
_eglSetConfigAtrib(config, EGL_SURFACE_TYPE, EGL_WINDOW_BIT);
_eglSetConfigAtrib(config, EGL_TRANSPARENT_TYPE, EGL_NONE);
_eglSetConfigAtrib(config, EGL_TRANSPARENT_RED_VALUE, EGL_DONT_CARE);
_eglSetConfigAtrib(config, EGL_TRANSPARENT_GREEN_VALUE, EGL_DONT_CARE);
_eglSetConfigAtrib(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->NumConfigs++;
return display->Configs + n;
}
else {
return NULL;
}
}
extern void
_eglSetConfigAtrib(_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:
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;
}
}
/**
* 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;
}
*num_config = MIN2(disp->NumConfigs, config_size);
if (configs) {
EGLint i;
for (i = 0; i < *num_config; i++) {
configs[i] = disp->Configs[i].Handle;
}
}
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++) {
_eglSetConfigAtrib(config, EGL_RED_SIZE, bits[0]);
_eglSetConfigAtrib(config, EGL_GREEN_SIZE, bits[1]);
_eglSetConfigAtrib(config, EGL_BLUE_SIZE, bits[2]);
_eglSetConfigAtrib(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];
_eglSetConfigAtrib(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;
_eglSetConfigAtrib(config, EGL_STENCIL_SIZE, stencil_bits[k]);
_eglSetConfigAtrib(config, EGL_DEPTH_SIZE, depth_bits[k]);
config->glmode.visualType = visType;
config->glmode.renderType = GLX_RGBA_BIT;
config->glmode.drawableType = GLX_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;
}
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