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 /**
  57  * Creates a set of \c _EGLConfigs that a driver will expose.
  58  *
  59  * A set of \c __GLcontextModes will be created based on the supplied
  60  * parameters.  The number of modes processed will be 2 *
  61  * \c num_depth_stencil_bits * \c num_db_modes.
  62  *
  63  * For the most part, data is just copied from \c depth_bits, \c stencil_bits,
  64  * \c db_modes, and \c visType into each \c __GLcontextModes element.
  65  * However, the meanings of \c fb_format and \c fb_type require further
  66  * explanation.  The \c fb_format specifies which color components are in
  67  * each pixel and what the default order is.  For example, \c GL_RGB specifies
  68  * that red, green, blue are available and red is in the "most significant"
  69  * position and blue is in the "least significant".  The \c fb_type specifies
  70  * the bit sizes of each component and the actual ordering.  For example, if
  71  * \c GL_UNSIGNED_SHORT_5_6_5_REV is specified with \c GL_RGB, bits [15:11]
  72  * are the blue value, bits [10:5] are the green value, and bits [4:0] are
  73  * the red value.
  74  *
  75  * One sublte issue is the combination of \c GL_RGB  or \c GL_BGR and either
  76  * of the \c GL_UNSIGNED_INT_8_8_8_8 modes.  The resulting mask values in the
  77  * \c __GLcontextModes structure is \b identical to the \c GL_RGBA or
  78  * \c GL_BGRA case, except the \c alphaMask is zero.  This means that, as
  79  * far as this routine is concerned, \c GL_RGB with \c GL_UNSIGNED_INT_8_8_8_8
  80  * still uses 32-bits.
  81  *
  82  * If in doubt, look at the tables used in the function.
  83  *
  84  * \param configs       the array of configs generated
  85  * \param fb_format     Format of the framebuffer.  Currently only \c GL_RGB,
  86  *                      \c GL_RGBA, \c GL_BGR, and \c GL_BGRA are supported.
  87  * \param fb_type       Type of the pixels in the framebuffer.  Currently only
  88  *                      \c GL_UNSIGNED_SHORT_5_6_5,
  89  *                      \c GL_UNSIGNED_SHORT_5_6_5_REV,
  90  *                      \c GL_UNSIGNED_INT_8_8_8_8, and
  91  *                      \c GL_UNSIGNED_INT_8_8_8_8_REV are supported.
  92  * \param depth_bits    Array of depth buffer sizes to be exposed.
  93  * \param stencil_bits  Array of stencil buffer sizes to be exposed.
  94  * \param num_depth_stencil_bits  Number of entries in both \c depth_bits and
  95  *                      \c stencil_bits.
  96  * \param db_modes      Array of buffer swap modes.  If an element has a
  97  *                      value of \c GLX_NONE, then it represents a
  98  *                      single-buffered mode.  Other valid values are
  99  *                      \c GLX_SWAP_EXCHANGE_OML, \c GLX_SWAP_COPY_OML, and
 100  *                      \c GLX_SWAP_UNDEFINED_OML.  See the
 101  *                      GLX_OML_swap_method extension spec for more details.
 102  * \param num_db_modes  Number of entries in \c db_modes.
 103  * \param visType       GLX visual type.  Usually either \c GLX_TRUE_COLOR or
 104  *                      \c GLX_DIRECT_COLOR.
 105  *
 106  * \returns
 107  * \c GL_TRUE on success or \c GL_FALSE on failure.  Currently the only
 108  * cause of failure is a bad parameter (i.e., unsupported \c fb_format or
 109  * \c fb_type).
 110  *
 111  * \todo
 112  * There is currently no way to support packed RGB modes (i.e., modes with
 113  * exactly 3 bytes per pixel) or floating-point modes.  This could probably
 114  * be done by creating some new, private enums with clever names likes
 115  * \c GL_UNSIGNED_3BYTE_8_8_8, \c GL_4FLOAT_32_32_32_32,
 116  * \c GL_4HALF_16_16_16_16, etc.  We can cross that bridge when we come to it.
 117  */
 118 EGLBoolean
 119 _eglFillInConfigs(_EGLConfig * configs,
 120                   GLenum fb_format, GLenum fb_type,
 121                   const uint8_t * depth_bits, const uint8_t * stencil_bits,
 122                   unsigned num_depth_stencil_bits,
 123                   const GLenum * db_modes, unsigned num_db_modes,
 124                   int visType)
 125 {
 126    static const uint8_t bits_table[3][4] = {
 127             /* R  G  B  A */
 128             { 5, 6, 5, 0 },  /* Any GL_UNSIGNED_SHORT_5_6_5 */
 129             { 8, 8, 8, 0 },  /* Any RGB with any GL_UNSIGNED_INT_8_8_8_8 */
 130             { 8, 8, 8, 8 }  /* Any RGBA with any GL_UNSIGNED_INT_8_8_8_8 */
 131          };
 132
 133    /* The following arrays are all indexed by the fb_type masked with 0x07.
 134     * Given the four supported fb_type values, this results in valid array
 135     * indices of 3, 4, 5, and 7.
 136     */
 137    static const uint32_t masks_table_rgb[8][4] = {
 138             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 139             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 140             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 141             {0x0000F800, 0x000007E0, 0x0000001F, 0x00000000},  /* 5_6_5       */
 142             {0x0000001F, 0x000007E0, 0x0000F800, 0x00000000},  /* 5_6_5_REV   */
 143             {0xFF000000, 0x00FF0000, 0x0000FF00, 0x00000000},  /* 8_8_8_8     */
 144             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 145             {0x000000FF, 0x0000FF00, 0x00FF0000, 0x00000000}  /* 8_8_8_8_REV */
 146          };
 147
 148    static const uint32_t masks_table_rgba[8][4] = {
 149             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 150             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 151             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 152             {0x0000F800, 0x000007E0, 0x0000001F, 0x00000000},  /* 5_6_5       */
 153             {0x0000001F, 0x000007E0, 0x0000F800, 0x00000000},  /* 5_6_5_REV   */
 154             {0xFF000000, 0x00FF0000, 0x0000FF00, 0x000000FF},  /* 8_8_8_8     */
 155             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 156             {0x000000FF, 0x0000FF00, 0x00FF0000, 0xFF000000},  /* 8_8_8_8_REV */
 157          };
 158
 159    static const uint32_t masks_table_bgr[8][4] = {
 160             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 161             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 162             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 163             {0x0000001F, 0x000007E0, 0x0000F800, 0x00000000},  /* 5_6_5       */
 164             {0x0000F800, 0x000007E0, 0x0000001F, 0x00000000},  /* 5_6_5_REV   */
 165             {0x0000FF00, 0x00FF0000, 0xFF000000, 0x00000000},  /* 8_8_8_8     */
 166             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 167             {0x00FF0000, 0x0000FF00, 0x000000FF, 0x00000000},  /* 8_8_8_8_REV */
 168          };
 169
 170    static const uint32_t masks_table_bgra[8][4] = {
 171             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 172             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 173             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 174             {0x0000001F, 0x000007E0, 0x0000F800, 0x00000000},  /* 5_6_5       */
 175             {0x0000F800, 0x000007E0, 0x0000001F, 0x00000000},  /* 5_6_5_REV   */
 176             {0x0000FF00, 0x00FF0000, 0xFF000000, 0x000000FF},  /* 8_8_8_8     */
 177             {0x00000000, 0x00000000, 0x00000000, 0x00000000},
 178             {0x00FF0000, 0x0000FF00, 0x000000FF, 0xFF000000},  /* 8_8_8_8_REV */
 179          };
 180
 181    static const uint8_t bytes_per_pixel[8] = {
 182             0, 0, 0, 2, 2, 4, 0, 4
 183          };
 184
 185    const uint8_t * bits;
 186    const uint32_t * masks;
 187    const int index = fb_type & 0x07;
 188    _EGLConfig *config;
 189    unsigned i;
 190    unsigned j;
 191    unsigned k;
 192
 193    if ( bytes_per_pixel[index] == 0 ) {
 194       _eglLog(_EGL_INFO,
 195               "[%s:%u] Framebuffer type 0x%04x has 0 bytes per pixel.",
 196               __FUNCTION__, __LINE__, fb_type);
 197       return GL_FALSE;
 198    }
 199
 200    /* Valid types are GL_UNSIGNED_SHORT_5_6_5 and GL_UNSIGNED_INT_8_8_8_8 and
 201     * the _REV versions.
 202     *
 203     * Valid formats are GL_RGBA, GL_RGB, and GL_BGRA.
 204     */
 205    switch ( fb_format ) {
 206    case GL_RGB:
 207       bits = (bytes_per_pixel[index] == 2) ? bits_table[0] : bits_table[1];
 208       masks = masks_table_rgb[index];
 209       break;
 210
 211    case GL_RGBA:
 212       bits = (bytes_per_pixel[index] == 2) ? bits_table[0] : bits_table[2];
 213       masks = masks_table_rgba[index];
 214       break;
 215
 216 #if 0
 217    case GL_BGR:
 218       bits = (bytes_per_pixel[index] == 2) ? bits_table[0] : bits_table[1];
 219       masks = masks_table_bgr[index];
 220       break;
 221
 222    case GL_BGRA:
 223       bits = (bytes_per_pixel[index] == 2) ? bits_table[0] : bits_table[2];
 224       masks = masks_table_bgra[index];
 225       break;
 226 #endif
 227
 228    default:
 229       _eglLog(_EGL_WARNING,
 230               "[%s:%u] Framebuffer format 0x%04x is not GL_RGB, GL_RGBA, GL_BGR, or GL_BGRA.",
 231               __FUNCTION__, __LINE__, fb_format);
 232       return GL_FALSE;
 233    }
 234
 235    config = configs;
 236    for (k = 0; k < num_depth_stencil_bits; k++) {
 237       for (i = 0; i < num_db_modes; i++)  {
 238          for (j = 0; j < 2; j++) {
 239             _eglSetConfigAttrib(config, EGL_RED_SIZE, bits[0]);
 240             _eglSetConfigAttrib(config, EGL_GREEN_SIZE, bits[1]);
 241             _eglSetConfigAttrib(config, EGL_BLUE_SIZE, bits[2]);
 242             _eglSetConfigAttrib(config, EGL_ALPHA_SIZE, bits[3]);
 243             _eglSetConfigAttrib(config, EGL_BUFFER_SIZE,
 244                                 bits[0] + bits[1] + bits[2] + bits[3]);
 245
 246             _eglSetConfigAttrib(config, EGL_STENCIL_SIZE, stencil_bits[k]);
 247             _eglSetConfigAttrib(config, EGL_DEPTH_SIZE, depth_bits[i]);
 248
 249             _eglSetConfigAttrib(config, EGL_SURFACE_TYPE, EGL_SCREEN_BIT_MESA |
 250                          EGL_PBUFFER_BIT | EGL_PIXMAP_BIT | EGL_WINDOW_BIT);
 251
 252             config++;
 253          }
 254       }
 255    }
 256    return GL_TRUE;
 257 }
 258