src/ui/gl/gl_image_shm.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ui/gl/gl_image_shm.h"
   6
   7 #include "base/debug/trace_event.h"
   8 #include "base/process/process_handle.h"
   9 #include "ui/gl/scoped_binders.h"
  10
  11 #if defined(OS_WIN) || defined(USE_X11) || defined(OS_ANDROID) || \
  12     defined(USE_OZONE)
  13 #include "ui/gl/gl_surface_egl.h"
  14 #endif
  15
  16 namespace gfx {
  17
  18 namespace {
  19
  20 bool ValidFormat(unsigned internalformat) {
  21   switch (internalformat) {
  22     case GL_BGRA8_EXT:
  23     case GL_RGBA8_OES:
  24       return true;
  25     default:
  26       return false;
  27   }
  28 }
  29
  30 GLenum TextureFormat(unsigned internalformat) {
  31   switch (internalformat) {
  32     case GL_BGRA8_EXT:
  33       return GL_BGRA_EXT;
  34     case GL_RGBA8_OES:
  35       return GL_RGBA;
  36     default:
  37       NOTREACHED();
  38       return 0;
  39   }
  40 }
  41
  42 GLenum DataFormat(unsigned internalformat) {
  43   return TextureFormat(internalformat);
  44 }
  45
  46 GLenum DataType(unsigned internalformat) {
  47   switch (internalformat) {
  48     case GL_BGRA8_EXT:
  49     case GL_RGBA8_OES:
  50       return GL_UNSIGNED_BYTE;
  51     default:
  52       NOTREACHED();
  53       return 0;
  54   }
  55 }
  56
  57 GLenum BytesPerPixel(unsigned internalformat) {
  58   switch (internalformat) {
  59     case GL_BGRA8_EXT:
  60     case GL_RGBA8_OES:
  61       return 4;
  62     default:
  63       NOTREACHED();
  64       return 0;
  65   }
  66 }
  67
  68 }  // namespace
  69
  70 GLImageShm::GLImageShm(gfx::Size size, unsigned internalformat)
  71     : size_(size),
  72       internalformat_(internalformat)
  73 #if defined(OS_WIN) || defined(USE_X11) || defined(OS_ANDROID) || \
  74     defined(USE_OZONE)
  75       ,
  76       egl_texture_id_(0u),
  77       egl_image_(EGL_NO_IMAGE_KHR)
  78 #endif
  79 {
  80 }
  81
  82 GLImageShm::~GLImageShm() { Destroy(); }
  83
  84 bool GLImageShm::Initialize(gfx::GpuMemoryBufferHandle buffer) {
  85   if (!ValidFormat(internalformat_)) {
  86     DVLOG(0) << "Invalid format: " << internalformat_;
  87     return false;
  88   }
  89
  90   if (!base::SharedMemory::IsHandleValid(buffer.handle))
  91     return false;
  92
  93   base::SharedMemory shared_memory(buffer.handle, true);
  94
  95   // Duplicate the handle.
  96   base::SharedMemoryHandle duped_shared_memory_handle;
  97   if (!shared_memory.ShareToProcess(base::GetCurrentProcessHandle(),
  98                                     &duped_shared_memory_handle)) {
  99     DVLOG(0) << "Failed to duplicate shared memory handle.";
 100     return false;
 101   }
 102
 103   shared_memory_.reset(
 104       new base::SharedMemory(duped_shared_memory_handle, true));
 105   return true;
 106 }
 107
 108 void GLImageShm::Destroy() {
 109 #if defined(OS_WIN) || defined(USE_X11) || defined(OS_ANDROID) || \
 110     defined(USE_OZONE)
 111   if (egl_image_ != EGL_NO_IMAGE_KHR) {
 112     eglDestroyImageKHR(GLSurfaceEGL::GetHardwareDisplay(), egl_image_);
 113     egl_image_ = EGL_NO_IMAGE_KHR;
 114   }
 115
 116   if (egl_texture_id_) {
 117     glDeleteTextures(1, &egl_texture_id_);
 118     egl_texture_id_ = 0u;
 119   }
 120 #endif
 121 }
 122
 123 gfx::Size GLImageShm::GetSize() { return size_; }
 124
 125 bool GLImageShm::BindTexImage(unsigned target) {
 126   TRACE_EVENT0("gpu", "GLImageShm::BindTexImage");
 127   DCHECK(shared_memory_);
 128   DCHECK(ValidFormat(internalformat_));
 129
 130   size_t size = size_.GetArea() * BytesPerPixel(internalformat_);
 131   DCHECK(!shared_memory_->memory());
 132   if (!shared_memory_->Map(size)) {
 133     DVLOG(0) << "Failed to map shared memory.";
 134     return false;
 135   }
 136
 137   DCHECK(shared_memory_->memory());
 138
 139 #if defined(OS_WIN) || defined(USE_X11) || defined(OS_ANDROID) || \
 140     defined(USE_OZONE)
 141   if (target == GL_TEXTURE_EXTERNAL_OES) {
 142     if (egl_image_ != EGL_NO_IMAGE_KHR)
 143       eglDestroyImageKHR(GLSurfaceEGL::GetHardwareDisplay(), egl_image_);
 144
 145     if (!egl_texture_id_)
 146       glGenTextures(1, &egl_texture_id_);
 147
 148     {
 149       ScopedTextureBinder texture_binder(GL_TEXTURE_2D, egl_texture_id_);
 150       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 151       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 152       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 153
 154       glTexImage2D(GL_TEXTURE_2D,
 155                    0,  // mip level
 156                    TextureFormat(internalformat_),
 157                    size_.width(),
 158                    size_.height(),
 159                    0,  // border
 160                    DataFormat(internalformat_),
 161                    DataType(internalformat_),
 162                    shared_memory_->memory());
 163     }
 164
 165     EGLint attrs[] = {EGL_IMAGE_PRESERVED_KHR, EGL_TRUE, EGL_NONE};
 166     // Need to pass current EGL rendering context to eglCreateImageKHR for
 167     // target type EGL_GL_TEXTURE_2D_KHR.
 168     egl_image_ =
 169         eglCreateImageKHR(GLSurfaceEGL::GetHardwareDisplay(),
 170                           eglGetCurrentContext(),
 171                           EGL_GL_TEXTURE_2D_KHR,
 172                           reinterpret_cast<EGLClientBuffer>(egl_texture_id_),
 173                           attrs);
 174     DCHECK_NE(EGL_NO_IMAGE_KHR, egl_image_)
 175         << "Error creating EGLImage: " << eglGetError();
 176
 177     glEGLImageTargetTexture2DOES(target, egl_image_);
 178     DCHECK_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());
 179
 180     shared_memory_->Unmap();
 181     return true;
 182   }
 183 #endif
 184
 185   DCHECK_NE(static_cast<GLenum>(GL_TEXTURE_EXTERNAL_OES), target);
 186   glTexImage2D(target,
 187                0,  // mip level
 188                TextureFormat(internalformat_),
 189                size_.width(),
 190                size_.height(),
 191                0,  // border
 192                DataFormat(internalformat_),
 193                DataType(internalformat_),
 194                shared_memory_->memory());
 195
 196   shared_memory_->Unmap();
 197   return true;
 198 }
 199
 200 }  // namespace gfx