summaryrefslogtreecommitdiff
path: root/src/egl/main/eglconfigutil.c
blob: b6585619a53f7933ab0bdbfd19f5a4f51f1e9d11 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
/**
 * 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 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)
{
#if 0
   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 ) {
      _eglLog(_EGL_INFO,
              "[%s:%u] Framebuffer type 0x%04x has 0 bytes per pixel.",
              __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:
      _eglLog(_EGL_WARNING,
              "[%s:%u] Framebuffer format 0x%04x is not GL_RGB, GL_RGBA, GL_BGR, or GL_BGRA.",
              __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]);
            _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;
#else
   return GL_FALSE;
#endif
}