chromium/third_party/angle/src/tests/gl_tests/MemoryBarrierTest.cpp

//
// Copyright 2021 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// MemoryBarrierTest:
//   Ensure that implementation of glMemoryBarrier is correct both in terms of memory barriers
//   issued and potential reordering of commands.
//
// The barrier bits accepted by glMemoryBarrier are used for synchronization as such:
//
//     VERTEX_ATTRIB_ARRAY_BARRIER_BIT: shader write -> vertex read
//     ELEMENT_ARRAY_BARRIER_BIT:       shader write -> index read
//     UNIFORM_BARRIER_BIT:             shader write -> uniform read
//     TEXTURE_FETCH_BARRIER_BIT:       shader write -> texture sample
//     SHADER_IMAGE_ACCESS_BARRIER_BIT: shader write -> image access
//                                      any access -> image write
//     COMMAND_BARRIER_BIT:             shader write -> indirect buffer read
//     PIXEL_BUFFER_BARRIER_BIT:        shader write -> pbo access
//     TEXTURE_UPDATE_BARRIER_BIT:      shader write -> texture data upload
//     BUFFER_UPDATE_BARRIER_BIT:       shader write -> buffer data upload/map
//     FRAMEBUFFER_BARRIER_BIT:         shader write -> access through framebuffer
//     TRANSFORM_FEEDBACK_BARRIER_BIT:  shader write -> transform feedback write
//     ATOMIC_COUNTER_BARRIER_BIT:      shader write -> atomic counter access
//     SHADER_STORAGE_BARRIER_BIT:      shader write -> buffer access
//                                      any access -> buffer write
//
// In summary, every bit defines a memory barrier for some access after a shader write.
// Additionally, SHADER_IMAGE_ACCESS_BARRIER_BIT and SHADER_STORAGE_BARRIER_BIT bits are used to
// define a memory barrier for shader writes after other accesses.

#include "test_utils/ANGLETest.h"
#include "test_utils/gl_raii.h"
#include "util/random_utils.h"

usingnamespaceangle;

namespace …  // anonymous namespace