src/gallium/drivers/vc4/vc4_query.c

   1 /*
   2  * Copyright © 2014 Broadcom
   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 /**
  25  * Stub support for occlusion queries.
  26  *
  27  * Since we expose support for GL 2.0, we have to expose occlusion queries,
  28  * but the spec allows you to expose 0 query counter bits, so we just return 0
  29  * as the result of all our queries.
  30  */
  31 #include "vc4_context.h"
  32
  33 struct vc4_query
  34 {
  35         uint8_t pad;
  36 };
  37
  38 static struct pipe_query *
  39 vc4_create_query(struct pipe_context *ctx, unsigned query_type, unsigned index)
  40 {
  41         struct vc4_query *query = calloc(1, sizeof(*query));
  42
  43         /* Note that struct pipe_query isn't actually defined anywhere. */
  44         return (struct pipe_query *)query;
  45 }
  46
  47 static void
  48 vc4_destroy_query(struct pipe_context *ctx, struct pipe_query *query)
  49 {
  50         free(query);
  51 }
  52
  53 static boolean
  54 vc4_begin_query(struct pipe_context *ctx, struct pipe_query *query)
  55 {
  56         return true;
  57 }
  58
  59 static void
  60 vc4_end_query(struct pipe_context *ctx, struct pipe_query *query)
  61 {
  62 }
  63
  64 static boolean
  65 vc4_get_query_result(struct pipe_context *ctx, struct pipe_query *query,
  66                      boolean wait, union pipe_query_result *vresult)
  67 {
  68         uint64_t *result = &vresult->u64;
  69
  70         *result = 0;
  71
  72         return true;
  73 }
  74
  75 void
  76 vc4_query_init(struct pipe_context *pctx)
  77 {
  78         pctx->create_query = vc4_create_query;
  79         pctx->destroy_query = vc4_destroy_query;
  80         pctx->begin_query = vc4_begin_query;
  81         pctx->end_query = vc4_end_query;
  82         pctx->get_query_result = vc4_get_query_result;
  83 }
  84