src/mesa/main/barrier.c

   1 /*
   2  * Copyright © 2011 Marek Olšák <maraeo@gmail.com>
   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
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 /**
  25  * \file barrier.c
  26  * Implementation of various pipeline barrier entry points.
  27  *
  28  * \author Marek Olšák <maraeo@gmail.com>
  29  */
  30
  31 #include "context.h"
  32 #include "barrier.h"
  33
  34
  35 static void
  36 _mesa_texture_barrier(struct gl_context *ctx)
  37 {
  38    /* no-op */
  39 }
  40
  41 void
  42 _mesa_init_barrier_functions(struct dd_function_table *driver)
  43 {
  44    driver->TextureBarrier = _mesa_texture_barrier;
  45 }
  46
  47 void GLAPIENTRY
  48 _mesa_TextureBarrierNV(void)
  49 {
  50    GET_CURRENT_CONTEXT(ctx);
  51
  52    if (!ctx->Extensions.NV_texture_barrier) {
  53       _mesa_error(ctx, GL_INVALID_OPERATION,
  54                   "glTextureBarrier(not supported)");
  55       return;
  56    }
  57
  58    ctx->Driver.TextureBarrier(ctx);
  59 }
  60
  61 void GLAPIENTRY
  62 _mesa_MemoryBarrier(GLbitfield barriers)
  63 {
  64    GET_CURRENT_CONTEXT(ctx);
  65
  66    if (ctx->Driver.MemoryBarrier)
  67       ctx->Driver.MemoryBarrier(ctx, barriers);
  68 }
  69
  70 void GLAPIENTRY
  71 _mesa_MemoryBarrierByRegion(GLbitfield barriers)
  72 {
  73    GET_CURRENT_CONTEXT(ctx);
  74
  75    GLbitfield all_allowed_bits = GL_ATOMIC_COUNTER_BARRIER_BIT |
  76                                  GL_FRAMEBUFFER_BARRIER_BIT |
  77                                  GL_SHADER_IMAGE_ACCESS_BARRIER_BIT |
  78                                  GL_SHADER_STORAGE_BARRIER_BIT |
  79                                  GL_TEXTURE_FETCH_BARRIER_BIT |
  80                                  GL_UNIFORM_BARRIER_BIT;
  81
  82    if (ctx->Driver.MemoryBarrier) {
  83       /* From section 7.11.2 of the OpenGL ES 3.1 specification:
  84        *
  85        *    "When barriers is ALL_BARRIER_BITS, shader memory accesses will be
  86        *     synchronized relative to all these barrier bits, but not to other
  87        *     barrier bits specific to MemoryBarrier."
  88        *
  89        * That is, if barriers is the special value GL_ALL_BARRIER_BITS, then all
  90        * barriers allowed by glMemoryBarrierByRegion should be activated."
  91        */
  92       if (barriers == GL_ALL_BARRIER_BITS) {
  93          ctx->Driver.MemoryBarrier(ctx, all_allowed_bits);
  94          return;
  95       }
  96
  97       /* From section 7.11.2 of the OpenGL ES 3.1 specification:
  98        *
  99        *    "An INVALID_VALUE error is generated if barriers is not the special
 100        *     value ALL_BARRIER_BITS, and has any bits set other than those
 101        *     described above."
 102        */
 103       if ((barriers & ~all_allowed_bits) != 0) {
 104          _mesa_error(ctx, GL_INVALID_VALUE,
 105                      "glMemoryBarrierByRegion(unsupported barrier bit");
 106       }
 107
 108       ctx->Driver.MemoryBarrier(ctx, barriers);
 109    }
 110 }