kc3-lang/angle/src/common/linux/dma_buf_utils.cpp

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• Hash : 458389f2
  Author :
  Date : 2021-09-02T22:41:40
  

  Vulkan: Support Linux dma-bufs
  
  This change adds support for EGL_EXT_image_dma_buf_import and
  EGL_EXT_image_dma_buf_import_modifiers on top of Vulkan's
  VK_EXT_external_memory_dma_buf and VK_EXT_image_drm_format_modifier.
  
  Bug: angleproject:6248
  Change-Id: I581987f88e9ddcf351dc721f499f63912dca05f9
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3145610
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
  

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• src/common/linux/dma_buf_utils.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.
  //
  
  // dma_buf_utils.cpp: Utilities to interact with Linux dma bufs.
  
  #include "dma_buf_utils.h"
  
  #include "common/debug.h"
  
  #include <sys/stat.h>
  #include <sys/time.h>
  #include <sys/types.h>
  #include <unistd.h>
  
  #include <array>
  
  // Refer to:
  // https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/uapi/drm/drm_fourcc.h
  // https://source.chromium.org/chromium/chromium/src/+/main:ui/gl/gl_image_native_pixmap.cc;l=24
  #define FOURCC(a, b, c, d)                                          \
      ((static_cast<uint32_t>(a)) | (static_cast<uint32_t>(b) << 8) | \
       (static_cast<uint32_t>(c) << 16) | (static_cast<uint32_t>(d) << 24))
  
  #define DRM_FORMAT_R8 FOURCC('R', '8', ' ', ' ')
  #define DRM_FORMAT_R16 FOURCC('R', '1', '6', ' ')
  #define DRM_FORMAT_GR88 FOURCC('G', 'R', '8', '8')
  #define DRM_FORMAT_RGB565 FOURCC('R', 'G', '1', '6')
  #define DRM_FORMAT_ARGB8888 FOURCC('A', 'R', '2', '4')
  #define DRM_FORMAT_ABGR8888 FOURCC('A', 'B', '2', '4')
  #define DRM_FORMAT_XRGB8888 FOURCC('X', 'R', '2', '4')
  #define DRM_FORMAT_XBGR8888 FOURCC('X', 'B', '2', '4')
  #define DRM_FORMAT_ABGR2101010 FOURCC('A', 'B', '3', '0')
  #define DRM_FORMAT_ARGB2101010 FOURCC('A', 'R', '3', '0')
  #define DRM_FORMAT_YVU420 FOURCC('Y', 'V', '1', '2')
  #define DRM_FORMAT_NV12 FOURCC('N', 'V', '1', '2')
  #define DRM_FORMAT_P010 FOURCC('P', '0', '1', '0')
  
  namespace angle
  {
  GLenum DrmFourCCFormatToGLInternalFormat(int fourccFormat, bool *isYUV)
  {
      *isYUV = false;
  
      switch (fourccFormat)
      {
          case DRM_FORMAT_R8:
              return GL_R8;
          case DRM_FORMAT_R16:
              return GL_R16_EXT;
          case DRM_FORMAT_GR88:
              return GL_RG8_EXT;
          case DRM_FORMAT_ABGR8888:
              return GL_RGBA8;
          case DRM_FORMAT_XBGR8888:
              return GL_RGB8;
          case DRM_FORMAT_ARGB8888:
              return GL_BGRA8_EXT;
          case DRM_FORMAT_XRGB8888:
              return GL_RGB8;
          case DRM_FORMAT_ABGR2101010:
          case DRM_FORMAT_ARGB2101010:
              return GL_RGB10_A2_EXT;
          case DRM_FORMAT_RGB565:
              return GL_RGB565;
          case DRM_FORMAT_NV12:
          case DRM_FORMAT_YVU420:
          case DRM_FORMAT_P010:
              *isYUV = true;
              return GL_RGB8;
          default:
              UNREACHABLE();
              WARN() << "Unknown dma_buf format " << fourccFormat
                     << " used to initialize an EGL image.";
              return GL_RGB8;
      }
  }
  
  }  // namespace angle
  

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