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 static ALWAYS_INLINE void
  71 memory_barrier_by_region(struct gl_context *ctx, GLbitfield barriers,
  72                          bool no_error)
  73 {
  74    GLbitfield all_allowed_bits = GL_ATOMIC_COUNTER_BARRIER_BIT |
  75                                  GL_FRAMEBUFFER_BARRIER_BIT |
  76                                  GL_SHADER_IMAGE_ACCESS_BARRIER_BIT |
  77                                  GL_SHADER_STORAGE_BARRIER_BIT |
  78                                  GL_TEXTURE_FETCH_BARRIER_BIT |
  79                                  GL_UNIFORM_BARRIER_BIT;
  80
  81    if (ctx->Driver.MemoryBarrier) {
  82       /* From section 7.11.2 of the OpenGL ES 3.1 specification:
  83        *
  84        *    "When barriers is ALL_BARRIER_BITS, shader memory accesses will be
  85        *     synchronized relative to all these barrier bits, but not to other
  86        *     barrier bits specific to MemoryBarrier."
  87        *
  88        * That is, if barriers is the special value GL_ALL_BARRIER_BITS, then all
  89        * barriers allowed by glMemoryBarrierByRegion should be activated."
  90        */
  91       if (barriers == GL_ALL_BARRIER_BITS) {
  92          ctx->Driver.MemoryBarrier(ctx, all_allowed_bits);
  93          return;
  94       }
  95
  96       /* From section 7.11.2 of the OpenGL ES 3.1 specification:
  97        *
  98        *    "An INVALID_VALUE error is generated if barriers is not the special
  99        *     value ALL_BARRIER_BITS, and has any bits set other than those
 100        *     described above."
 101        */
 102       if (!no_error && (barriers & ~all_allowed_bits) != 0) {
 103          _mesa_error(ctx, GL_INVALID_VALUE,
 104                      "glMemoryBarrierByRegion(unsupported barrier bit");
 105       }
 106
 107       ctx->Driver.MemoryBarrier(ctx, barriers);
 108    }
 109 }
 110
 111 void GLAPIENTRY
 112 _mesa_MemoryBarrierByRegion_no_error(GLbitfield barriers)
 113 {
 114    GET_CURRENT_CONTEXT(ctx);
 115    memory_barrier_by_region(ctx, barriers, true);
 116 }
 117
 118 void GLAPIENTRY
 119 _mesa_MemoryBarrierByRegion(GLbitfield barriers)
 120 {
 121    GET_CURRENT_CONTEXT(ctx);
 122    memory_barrier_by_region(ctx, barriers, false);
 123 }
 124
 125 void GLAPIENTRY
 126 _mesa_BlendBarrier(void)
 127 {
 128    GET_CURRENT_CONTEXT(ctx);
 129
 130    if (!ctx->Extensions.KHR_blend_equation_advanced) {
 131       _mesa_error(ctx, GL_INVALID_OPERATION,
 132                   "glBlendBarrier(not supported)");
 133       return;
 134    }
 135
 136    ctx->Driver.FramebufferFetchBarrier(ctx);
 137 }
 138
 139 void GLAPIENTRY
 140 _mesa_FramebufferFetchBarrierEXT(void)
 141 {
 142    GET_CURRENT_CONTEXT(ctx);
 143
 144    if (!ctx->Extensions.EXT_shader_framebuffer_fetch_non_coherent) {
 145       _mesa_error(ctx, GL_INVALID_OPERATION,
 146                   "glFramebufferFetchBarrierEXT(not supported)");
 147       return;
 148    }
 149
 150    ctx->Driver.FramebufferFetchBarrier(ctx);
 151 }