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/**
* Extra utility functions related to EGL configs.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "eglconfigutil.h"
#include "egllog.h"
/**
* Convert an _EGLConfig to a __GLcontextModes object.
* NOTE: This routine may be incomplete - we're only making sure that
* the fields needed by Mesa (for _mesa_create_context/framebuffer) are
* set correctly.
*/
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; /* always DB for now */
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 = GET_CONFIG_ATTRIB(config, EGL_BUFFER_SIZE);
/* no rgba masks - fix? */
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;
/* no accum */
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);
/* surface type - not really needed */
mode->visualType = GLX_TRUE_COLOR;
mode->renderType = GLX_RGBA_BIT;
}
/**
* Creates a set of \c _EGLConfigs 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 configs the array of configs generated
* \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.
*/
EGLBoolean
_eglFillInConfigs(_EGLConfig * configs,
GLenum fb_format, GLenum fb_type,
const uint8_t * depth_bits, const uint8_t * stencil_bits,
unsigned num_depth_stencil_bits,
const GLenum * db_modes, unsigned num_db_modes,
int visType)
{
static const uint8_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 uint32_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 uint32_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 uint32_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 uint32_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 uint8_t bytes_per_pixel[8] = {
0, 0, 0, 2, 2, 4, 0, 4
};
const uint8_t * bits;
const uint32_t * masks;
const int index = fb_type & 0x07;
_EGLConfig *config;
unsigned i;
unsigned j;
unsigned k;
if ( bytes_per_pixel[index] == 0 ) {
_eglLog(_EGL_INFO,
"[_eglFillInConfigs:%u] Framebuffer type 0x%04x has 0 bytes per pixel.",
__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;
#if 0
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;
#endif
default:
_eglLog(_EGL_WARNING,
"[_eglFillInConfigs:%u] Framebuffer format 0x%04x is not GL_RGB, GL_RGBA, GL_BGR, or GL_BGRA.",
__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]);
_eglSetConfigAttrib(config, EGL_BUFFER_SIZE,
bits[0] + bits[1] + bits[2] + bits[3]);
_eglSetConfigAttrib(config, EGL_STENCIL_SIZE, stencil_bits[k]);
_eglSetConfigAttrib(config, EGL_DEPTH_SIZE, depth_bits[i]);
_eglSetConfigAttrib(config, EGL_SURFACE_TYPE, EGL_SCREEN_BIT_MESA |
EGL_PBUFFER_BIT | EGL_PIXMAP_BIT | EGL_WINDOW_BIT);
config++;
}
}
}
return GL_TRUE;
}
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