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      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/context.h"
     27 #include "main/formatquery.h"
     28 #include "main/glformats.h"
     29 
     30 static size_t
     31 brw_query_samples_for_format(struct gl_context *ctx, GLenum target,
     32                              GLenum internalFormat, int samples[16])
     33 {
     34    struct brw_context *brw = brw_context(ctx);
     35 
     36    (void) target;
     37    (void) internalFormat;
     38 
     39    switch (brw->gen) {
     40    case 9:
     41       samples[0] = 16;
     42       samples[1] = 8;
     43       samples[2] = 4;
     44       samples[3] = 2;
     45       return 4;
     46 
     47    case 8:
     48       samples[0] = 8;
     49       samples[1] = 4;
     50       samples[2] = 2;
     51       return 3;
     52 
     53    case 7:
     54       if (internalFormat == GL_RGBA32F && _mesa_is_gles(ctx)) {
     55          /* For GLES, we are allowed to return a smaller number of samples for
     56           * GL_RGBA32F. See OpenGLES 3.2 spec, section 20.3.1 Internal Format
     57           * Query Parameters, under SAMPLES:
     58           *
     59           * "A value less than or equal to the value of MAX_SAMPLES, if
     60           *  internalformat is RGBA16F, R32F, RG32F, or RGBA32F."
     61           *
     62           * In brw_render_target_supported, we prevent formats with a size
     63           * greater than 8 bytes from using 8x MSAA on gen7.
     64           */
     65          samples[0] = 4;
     66          return 1;
     67       } else {
     68          samples[0] = 8;
     69          samples[1] = 4;
     70          return 2;
     71       }
     72 
     73    case 6:
     74       samples[0] = 4;
     75       return 1;
     76 
     77    default:
     78       assert(brw->gen < 6);
     79       samples[0] = 1;
     80       return 1;
     81    }
     82 }
     83 
     84 void
     85 brw_query_internal_format(struct gl_context *ctx, GLenum target,
     86                           GLenum internalFormat, GLenum pname, GLint *params)
     87 {
     88    /* The Mesa layer gives us a temporary params buffer that is guaranteed
     89     * to be non-NULL, and have at least 16 elements.
     90     */
     91    assert(params != NULL);
     92 
     93    switch (pname) {
     94    case GL_SAMPLES:
     95       brw_query_samples_for_format(ctx, target, internalFormat, params);
     96       break;
     97 
     98    case GL_NUM_SAMPLE_COUNTS: {
     99       size_t num_samples;
    100       GLint dummy_buffer[16];
    101 
    102       num_samples = brw_query_samples_for_format(ctx, target, internalFormat,
    103                                                  dummy_buffer);
    104       params[0] = (GLint) num_samples;
    105       break;
    106    }
    107 
    108    default:
    109       /* By default, we call the driver hook's fallback function from the frontend,
    110        * which has generic implementation for all pnames.
    111        */
    112       _mesa_query_internal_format_default(ctx, target, internalFormat, pname,
    113                                           params);
    114       break;
    115    }
    116 }
    117