src/egl/main/eglconfigutil.c

   1 /**
   2  * Extra utility functions related to EGL configs.
   3  */
   4
   5
   6 #include <stdlib.h>
   7 #include <stdio.h>
   8 #include <string.h>
   9 #include "eglconfigutil.h"
  10 #include "egllog.h"
  11
  12
  13 /**
  14  * Convert an _EGLConfig to a __GLcontextModes object.
  15  * NOTE: This routine may be incomplete - we're only making sure that
  16  * the fields needed by Mesa (for _mesa_create_context/framebuffer) are
  17  * set correctly.
  18  */
  19 void
  20 _eglConfigToContextModesRec(const _EGLConfig *config, __GLcontextModes *mode)
  21 {
  22    memset(mode, 0, sizeof(*mode));
  23
  24    mode->rgbMode = GL_TRUE; /* no color index */
  25    mode->colorIndexMode = GL_FALSE;
  26    mode->doubleBufferMode = GL_TRUE;  /* always DB for now */
  27    mode->stereoMode = GL_FALSE;
  28
  29    mode->redBits = GET_CONFIG_ATTRIB(config, EGL_RED_SIZE);
  30    mode->greenBits = GET_CONFIG_ATTRIB(config, EGL_GREEN_SIZE);
  31    mode->blueBits = GET_CONFIG_ATTRIB(config, EGL_BLUE_SIZE);
  32    mode->alphaBits = GET_CONFIG_ATTRIB(config, EGL_ALPHA_SIZE);
  33    mode->rgbBits = GET_CONFIG_ATTRIB(config, EGL_BUFFER_SIZE);
  34
  35    /* no rgba masks - fix? */
  36
  37    mode->depthBits = GET_CONFIG_ATTRIB(config, EGL_DEPTH_SIZE);
  38    mode->haveDepthBuffer = mode->depthBits > 0;
  39
  40    mode->stencilBits = GET_CONFIG_ATTRIB(config, EGL_STENCIL_SIZE);
  41    mode->haveStencilBuffer = mode->stencilBits > 0;
  42
  43    /* no accum */
  44
  45    mode->level = GET_CONFIG_ATTRIB(config, EGL_LEVEL);
  46    mode->samples = GET_CONFIG_ATTRIB(config, EGL_SAMPLES);
  47    mode->sampleBuffers = GET_CONFIG_ATTRIB(config, EGL_SAMPLE_BUFFERS);
  48
  49    /* surface type - not really needed */
  50    mode->visualType = GLX_TRUE_COLOR;
  51    mode->renderType = GLX_RGBA_BIT;
  52 }
  53
  54
  55 /**
  56  * Convert a __GLcontextModes object to an _EGLConfig.
  57  */
  58 EGLBoolean
  59 _eglConfigFromContextModesRec(_EGLConfig *conf, const __GLcontextModes *m,
  60                               EGLint conformant, EGLint renderable_type)
  61 {
  62    EGLint config_caveat, surface_type;
  63
  64    /* must be RGBA */
  65    if (!m->rgbMode || !(m->renderType & GLX_RGBA_BIT))
  66       return EGL_FALSE;
  67
  68    config_caveat = EGL_NONE;
  69    if (m->visualRating == GLX_SLOW_CONFIG)
  70       config_caveat = EGL_SLOW_CONFIG;
  71
  72    if (m->visualRating == GLX_NON_CONFORMANT_CONFIG)
  73       conformant &= ~EGL_OPENGL_BIT;
  74    if (!(conformant & EGL_OPENGL_ES_BIT))
  75       config_caveat = EGL_NON_CONFORMANT_CONFIG;
  76
  77    surface_type = 0;
  78    if (m->drawableType & GLX_WINDOW_BIT)
  79       surface_type |= EGL_WINDOW_BIT;
  80    if (m->drawableType & GLX_PIXMAP_BIT)
  81       surface_type |= EGL_PIXMAP_BIT;
  82    if (m->drawableType & GLX_PBUFFER_BIT)
  83       surface_type |= EGL_PBUFFER_BIT;
  84
  85    SET_CONFIG_ATTRIB(conf, EGL_BUFFER_SIZE, m->rgbBits);
  86    SET_CONFIG_ATTRIB(conf, EGL_RED_SIZE, m->redBits);
  87    SET_CONFIG_ATTRIB(conf, EGL_GREEN_SIZE, m->greenBits);
  88    SET_CONFIG_ATTRIB(conf, EGL_BLUE_SIZE, m->blueBits);
  89    SET_CONFIG_ATTRIB(conf, EGL_ALPHA_SIZE, m->alphaBits);
  90
  91    SET_CONFIG_ATTRIB(conf, EGL_BIND_TO_TEXTURE_RGB, m->bindToTextureRgb);
  92    SET_CONFIG_ATTRIB(conf, EGL_BIND_TO_TEXTURE_RGBA, m->bindToTextureRgba);
  93    SET_CONFIG_ATTRIB(conf, EGL_COLOR_BUFFER_TYPE, EGL_RGB_BUFFER);
  94    SET_CONFIG_ATTRIB(conf, EGL_CONFIG_CAVEAT, config_caveat);
  95
  96    SET_CONFIG_ATTRIB(conf, EGL_CONFORMANT, conformant);
  97    SET_CONFIG_ATTRIB(conf, EGL_DEPTH_SIZE, m->depthBits);
  98    SET_CONFIG_ATTRIB(conf, EGL_LEVEL, m->level);
  99    SET_CONFIG_ATTRIB(conf, EGL_MAX_PBUFFER_WIDTH, m->maxPbufferWidth);
 100    SET_CONFIG_ATTRIB(conf, EGL_MAX_PBUFFER_HEIGHT, m->maxPbufferHeight);
 101    SET_CONFIG_ATTRIB(conf, EGL_MAX_PBUFFER_PIXELS, m->maxPbufferPixels);
 102
 103    SET_CONFIG_ATTRIB(conf, EGL_NATIVE_RENDERABLE, m->xRenderable);
 104    SET_CONFIG_ATTRIB(conf, EGL_NATIVE_VISUAL_ID, m->visualID);
 105    SET_CONFIG_ATTRIB(conf, EGL_NATIVE_VISUAL_TYPE, m->visualType);
 106    SET_CONFIG_ATTRIB(conf, EGL_RENDERABLE_TYPE, renderable_type);
 107    SET_CONFIG_ATTRIB(conf, EGL_SAMPLE_BUFFERS, m->sampleBuffers);
 108    SET_CONFIG_ATTRIB(conf, EGL_SAMPLES, m->samples);
 109    SET_CONFIG_ATTRIB(conf, EGL_STENCIL_SIZE, m->stencilBits);
 110
 111    SET_CONFIG_ATTRIB(conf, EGL_SURFACE_TYPE, surface_type);
 112
 113    /* what to do with GLX_TRANSPARENT_INDEX? */
 114    if (m->transparentPixel == GLX_TRANSPARENT_RGB) {
 115       SET_CONFIG_ATTRIB(conf, EGL_TRANSPARENT_TYPE, EGL_TRANSPARENT_RGB);
 116       SET_CONFIG_ATTRIB(conf, EGL_TRANSPARENT_RED_VALUE, m->transparentRed);
 117       SET_CONFIG_ATTRIB(conf, EGL_TRANSPARENT_GREEN_VALUE, m->transparentGreen);
 118       SET_CONFIG_ATTRIB(conf, EGL_TRANSPARENT_BLUE_VALUE, m->transparentBlue);
 119    }
 120    else {
 121       SET_CONFIG_ATTRIB(conf, EGL_TRANSPARENT_TYPE, EGL_NONE);
 122    }
 123
 124    return EGL_TRUE;
 125 }
 126
 127
 128 /**
 129  * Creates a set of \c _EGLConfigs that a driver will expose.
 130  *
 131  * A set of \c __GLcontextModes will be created based on the supplied
 132  * parameters.  The number of modes processed will be 2 *
 133  * \c num_depth_stencil_bits * \c num_db_modes.
 134  *
 135  * For the most part, data is just copied from \c depth_bits, \c stencil_bits,
 136  * \c db_modes, and \c visType into each \c __GLcontextModes element.
 137  * However, the meanings of \c fb_format and \c fb_type require further
 138  * explanation.  The \c fb_format specifies which color components are in
 139  * each pixel and what the default order is.  For example, \c GL_RGB specifies
 140  * that red, green, blue are available and red is in the "most significant"
 141  * position and blue is in the "least significant".  The \c fb_type specifies
 142  * the bit sizes of each component and the actual ordering.  For example, if
 143  * \c GL_UNSIGNED_SHORT_5_6_5_REV is specified with \c GL_RGB, bits [15:11]
 144  * are the blue value, bits [10:5] are the green value, and bits [4:0] are
 145  * the red value.
 146  *
 147  * One sublte issue is the combination of \c GL_RGB  or \c GL_BGR and either
 148  * of the \c GL_UNSIGNED_INT_8_8_8_8 modes.  The resulting mask values in the
 149  * \c __GLcontextModes structure is \b identical to the \c GL_RGBA or
 150  * \c GL_BGRA case, except the \c alphaMask is zero.  This means that, as
 151  * far as this routine is concerned, \c GL_RGB with \c GL_UNSIGNED_INT_8_8_8_8
 152  * still uses 32-bits.
 153  *
 154  * If in doubt, look at the tables used in the function.
 155  *
 156  * \param configs       the array of configs generated
 157  * \param fb_format     Format of the framebuffer.  Currently only \c GL_RGB,
 158  *                      \c GL_RGBA, \c GL_BGR, and \c GL_BGRA are supported.
 159  * \param fb_type       Type of the pixels in the framebuffer.  Currently only
 160  *                      \c GL_UNSIGNED_SHORT_5_6_5,
 161  *                      \c GL_UNSIGNED_SHORT_5_6_5_REV,
 162  *                      \c GL_UNSIGNED_INT_8_8_8_8, and
 163  *                      \c GL_UNSIGNED_INT_8_8_8_8_REV are supported.
 164  * \param depth_bits    Array of depth buffer sizes to be exposed.
 165  * \param stencil_bits  Array of stencil buffer sizes to be exposed.
 166  * \param num_depth_stencil_bits  Number of entries in both \c depth_bits and
 167  *                      \c stencil_bits.
 168  * \param db_modes      Array of buffer swap modes.  If an element has a
 169  *                      value of \c GLX_NONE, then it represents a
 170  *                      single-buffered mode.  Other valid values are
 171  *                      \c GLX_SWAP_EXCHANGE_OML, \c GLX_SWAP_COPY_OML, and
 172  *                      \c GLX_SWAP_UNDEFINED_OML.  See the
 173  *                      GLX_OML_swap_method extension spec for more details.
 174  * \param num_db_modes  Number of entries in \c db_modes.
 175  * \param visType       GLX visual type.  Usually either \c GLX_TRUE_COLOR or
 176  *                      \c GLX_DIRECT_COLOR.
 177  *
 178  * \returns
 179  * \c GL_TRUE on success or \c GL_FALSE on failure.  Currently the only
 180  * cause of failure is a bad parameter (i.e., unsupported \c fb_format or
 181  * \c fb_type).
 182  *
 183  * \todo
 184  * There is currently no way to support packed RGB modes (i.e., modes with
 185  * exactly 3 bytes per pixel) or floating-point modes.  This could probably
 186  * be done by creating some new, private enums with clever names likes
 187  * \c GL_UNSIGNED_3BYTE_8_8_8, \c GL_4FLOAT_32_32_32_32,
 188  * \c GL_4HALF_16_16_16_16, etc.  We can cross that bridge when we come to it.
 189  */
 190 EGLBoolean
 191 _eglFillInConfigs(_EGLConfig * configs,
 192                   GLenum fb_format, GLenum fb_type,
 193                   const uint8_t * depth_bits, const uint8_t * stencil_bits,
 194                   unsigned num_depth_stencil_bits,
 195                   const GLenum * db_modes, unsigned num_db_modes,
 196                   int visType)
 197 {
 198    static const uint8_t bits_table[3][4] = {
 199             /* R  G  B  A */
 200             { 5, 6, 5, 0 },  /* Any GL_UNSIGNED_SHORT_5_6_5 */
 201             { 8, 8, 8, 0 },  /* Any RGB with any GL_UNSIGNED_INT_8_8_8_8 */
 202             { 8, 8, 8, 8 }  /* Any RGBA with any GL_UNSIGNED_INT_8_8_8_8 */
 203          };
 204
 205    /* The following arrays are all indexed by the fb_type masked with 0x07.
 206     * Given the four supported fb_type values, this results in valid array
 207     * indices of 3, 4, 5, and 7.
 208     */
 209    static const uint32_t masks_table_rgb[8][4] = {
 210             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 211             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 212             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 213             {0x0000F800, 0x000007E0, 0x0000001F, 0x00000000},  /* 5_6_5       */
 214             {0x0000001F, 0x000007E0, 0x0000F800, 0x00000000},  /* 5_6_5_REV   */
 215             {0xFF000000, 0x00FF0000, 0x0000FF00, 0x00000000},  /* 8_8_8_8     */
 216             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 217             {0x000000FF, 0x0000FF00, 0x00FF0000, 0x00000000}  /* 8_8_8_8_REV */
 218          };
 219
 220    static const uint32_t masks_table_rgba[8][4] = {
 221             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 222             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 223             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 224             {0x0000F800, 0x000007E0, 0x0000001F, 0x00000000},  /* 5_6_5       */
 225             {0x0000001F, 0x000007E0, 0x0000F800, 0x00000000},  /* 5_6_5_REV   */
 226             {0xFF000000, 0x00FF0000, 0x0000FF00, 0x000000FF},  /* 8_8_8_8     */
 227             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 228             {0x000000FF, 0x0000FF00, 0x00FF0000, 0xFF000000},  /* 8_8_8_8_REV */
 229          };
 230
 231 #if 0
 232    static const uint32_t masks_table_bgr[8][4] = {
 233             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 234             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 235             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 236             {0x0000001F, 0x000007E0, 0x0000F800, 0x00000000},  /* 5_6_5       */
 237             {0x0000F800, 0x000007E0, 0x0000001F, 0x00000000},  /* 5_6_5_REV   */
 238             {0x0000FF00, 0x00FF0000, 0xFF000000, 0x00000000},  /* 8_8_8_8     */
 239             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 240             {0x00FF0000, 0x0000FF00, 0x000000FF, 0x00000000},  /* 8_8_8_8_REV */
 241          };
 242
 243    static const uint32_t masks_table_bgra[8][4] = {
 244             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 245             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 246             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 247             {0x0000001F, 0x000007E0, 0x0000F800, 0x00000000},  /* 5_6_5       */
 248             {0x0000F800, 0x000007E0, 0x0000001F, 0x00000000},  /* 5_6_5_REV   */
 249             {0x0000FF00, 0x00FF0000, 0xFF000000, 0x000000FF},  /* 8_8_8_8     */
 250             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 251             {0x00FF0000, 0x0000FF00, 0x000000FF, 0xFF000000},  /* 8_8_8_8_REV */
 252          };
 253 #endif
 254
 255    static const uint8_t bytes_per_pixel[8] = {
 256             0, 0, 0, 2, 2, 4, 0, 4
 257          };
 258
 259    const uint8_t * bits;
 260    const uint32_t * masks;
 261    const int index = fb_type & 0x07;
 262    _EGLConfig *config;
 263    unsigned i;
 264    unsigned j;
 265    unsigned k;
 266
 267    if ( bytes_per_pixel[index] == 0 ) {
 268       _eglLog(_EGL_INFO,
 269               "[_eglFillInConfigs:%u] Framebuffer type 0x%04x has 0 bytes per pixel.",
 270               __LINE__, fb_type);
 271       return GL_FALSE;
 272    }
 273
 274    /* Valid types are GL_UNSIGNED_SHORT_5_6_5 and GL_UNSIGNED_INT_8_8_8_8 and
 275     * the _REV versions.
 276     *
 277     * Valid formats are GL_RGBA, GL_RGB, and GL_BGRA.
 278     */
 279    switch ( fb_format ) {
 280    case GL_RGB:
 281       bits = (bytes_per_pixel[index] == 2) ? bits_table[0] : bits_table[1];
 282       masks = masks_table_rgb[index];
 283       break;
 284
 285    case GL_RGBA:
 286       bits = (bytes_per_pixel[index] == 2) ? bits_table[0] : bits_table[2];
 287       masks = masks_table_rgba[index];
 288       break;
 289
 290 #if 0
 291    case GL_BGR:
 292       bits = (bytes_per_pixel[index] == 2) ? bits_table[0] : bits_table[1];
 293       masks = masks_table_bgr[index];
 294       break;
 295
 296    case GL_BGRA:
 297       bits = (bytes_per_pixel[index] == 2) ? bits_table[0] : bits_table[2];
 298       masks = masks_table_bgra[index];
 299       break;
 300 #endif
 301
 302    default:
 303       _eglLog(_EGL_WARNING,
 304               "[_eglFillInConfigs:%u] Framebuffer format 0x%04x is not GL_RGB, GL_RGBA, GL_BGR, or GL_BGRA.",
 305               __LINE__, fb_format);
 306       return GL_FALSE;
 307    }
 308
 309    config = configs;
 310    for (k = 0; k < num_depth_stencil_bits; k++) {
 311       for (i = 0; i < num_db_modes; i++)  {
 312          for (j = 0; j < 2; j++) {
 313             _eglSetConfigAttrib(config, EGL_RED_SIZE, bits[0]);
 314             _eglSetConfigAttrib(config, EGL_GREEN_SIZE, bits[1]);
 315             _eglSetConfigAttrib(config, EGL_BLUE_SIZE, bits[2]);
 316             _eglSetConfigAttrib(config, EGL_ALPHA_SIZE, bits[3]);
 317             _eglSetConfigAttrib(config, EGL_BUFFER_SIZE,
 318                                 bits[0] + bits[1] + bits[2] + bits[3]);
 319
 320             _eglSetConfigAttrib(config, EGL_STENCIL_SIZE, stencil_bits[k]);
 321             _eglSetConfigAttrib(config, EGL_DEPTH_SIZE, depth_bits[i]);
 322
 323             _eglSetConfigAttrib(config, EGL_SURFACE_TYPE, EGL_SCREEN_BIT_MESA |
 324                          EGL_PBUFFER_BIT | EGL_PIXMAP_BIT | EGL_WINDOW_BIT);
 325
 326             config++;
 327          }
 328       }
 329    }
 330    return GL_TRUE;
 331 }
 332