src/mesa/drivers/dri/i965/brw_formatquery.c

   1 /*
   2  * Copyright © 2015 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 #include "brw_context.h"
  25 #include "brw_state.h"
  26 #include "main/formatquery.h"
  27 #include "main/glformats.h"
  28
  29 static size_t
  30 brw_query_samples_for_format(struct gl_context *ctx, GLenum target,
  31                              GLenum internalFormat, int samples[16])
  32 {
  33    struct brw_context *brw = brw_context(ctx);
  34
  35    (void) target;
  36    (void) internalFormat;
  37
  38    switch (brw->gen) {
  39    case 9:
  40       samples[0] = 16;
  41       samples[1] = 8;
  42       samples[2] = 4;
  43       samples[3] = 2;
  44       return 4;
  45
  46    case 8:
  47       samples[0] = 8;
  48       samples[1] = 4;
  49       samples[2] = 2;
  50       return 3;
  51
  52    case 7:
  53       samples[0] = 8;
  54       samples[1] = 4;
  55       return 2;
  56
  57    case 6:
  58       samples[0] = 4;
  59       return 1;
  60
  61    default:
  62       assert(brw->gen < 6);
  63       samples[0] = 1;
  64       return 1;
  65    }
  66 }
  67
  68 void
  69 brw_query_internal_format(struct gl_context *ctx, GLenum target,
  70                           GLenum internalFormat, GLenum pname, GLint *params)
  71 {
  72    /* The Mesa layer gives us a temporary params buffer that is guaranteed
  73     * to be non-NULL, and have at least 16 elements.
  74     */
  75    assert(params != NULL);
  76
  77    switch (pname) {
  78    case GL_SAMPLES:
  79       brw_query_samples_for_format(ctx, target, internalFormat, params);
  80       break;
  81
  82    case GL_NUM_SAMPLE_COUNTS: {
  83       size_t num_samples;
  84       GLint dummy_buffer[16];
  85
  86       num_samples = brw_query_samples_for_format(ctx, target, internalFormat,
  87                                                  dummy_buffer);
  88       params[0] = (GLint) num_samples;
  89       break;
  90    }
  91
  92    default:
  93       /* By default, we call the driver hook's fallback function from the frontend,
  94        * which has generic implementation for all pnames.
  95        */
  96       _mesa_query_internal_format_default(ctx, target, internalFormat, pname,
  97                                           params);
  98       break;
  99    }
 100 }