gpu: Add CHROMIUM_gpu_memory_buffer_image extension.

gpu/command_buffer/client/gles2_implementation.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // A class to emulate GLES2 over command buffers.
 
 #include "gpu/command_buffer/client/gles2_implementation.h"
 
 #include <GLES2/gl2ext.h>
 #include <GLES2/gl2extchromium.h>
@@ skipping 2192 matching lines @@
   helper_->GetString(name, kResultBucketId);
   std::string str;
   if (GetBucketAsString(kResultBucketId, &str)) {
     // Adds extensions implemented on client side only.
     switch (name) {
       case GL_EXTENSIONS:
         str += std::string(str.empty() ? "" : " ") +
             "GL_CHROMIUM_flipy "
             "GL_EXT_unpack_subimage "
             "GL_CHROMIUM_map_sub";
-        if (capabilities_.image) {
-          // The first space character is intentional.
-          str += " GL_CHROMIUM_image";
-        }
+        if (capabilities_.image)
+          str += " GL_CHROMIUM_image GL_CHROMIUM_gpu_memory_buffer_image";
         if (capabilities_.future_sync_points)
           str += " GL_CHROMIUM_future_sync_point";
         break;
       default:
         break;
     }
 
     // Because of WebGL the extensions can change. We have to cache each unique
     // result since we don't know when the client will stop referring to a
     // previous one it queries.
@@ skipping 1780 matching lines @@
 
 void GLES2Implementation::RetireSyncPointCHROMIUM(GLuint sync_point) {
   GPU_CLIENT_SINGLE_THREAD_CHECK();
   GPU_CLIENT_LOG("[" << GetLogPrefix() << "] glRetireSyncPointCHROMIUM("
                      << sync_point << ")");
   DCHECK(capabilities_.future_sync_points);
   helper_->CommandBufferHelper::Flush();
   gpu_control_->RetireSyncPoint(sync_point);
 }
 
+namespace {
+
+bool ValidImageFormat(GLenum internalformat) {
+  switch (internalformat) {
+    case GL_RGB:
+    case GL_RGBA:
+      return true;
+    default:
+      return false;
+  }
+}
+
+bool ValidImageUsage(GLenum usage) {
+  switch (usage) {
+    case GL_MAP_CHROMIUM:
+    case GL_SCANOUT_CHROMIUM:
+      return true;
+    default:
+      return false;
+  }
+}
+
+}  // namespace
+
 GLuint GLES2Implementation::CreateImageCHROMIUMHelper(GLsizei width,
                                                       GLsizei height,
                                                       GLenum internalformat,
                                                       GLenum usage) {
   if (width <= 0) {
     SetGLError(GL_INVALID_VALUE, "glCreateImageCHROMIUM", "width <= 0");
     return 0;
   }
 
   if (height <= 0) {
@@ skipping 132 matching lines @@
   GPU_CLIENT_SINGLE_THREAD_CHECK();
   GPU_CLIENT_VALIDATE_DESTINATION_INITALIZATION(GLint, params);
   GPU_CLIENT_LOG("[" << GetLogPrefix() << "] glImageParameterivCHROMIUM("
       << image_id << ", "
       << GLES2Util::GetStringBufferParameter(pname) << ", "
       << static_cast<const void*>(params) << ")");
   GetImageParameterivCHROMIUMHelper(image_id, pname, params);
   CheckGLError();
 }
 
+GLuint GLES2Implementation::CreateGpuMemoryBufferImageCHROMIUMHelper(
+    GLsizei width,
+    GLsizei height,
+    GLenum internalformat,
+    GLenum usage) {
+  if (width <= 0) {
+    SetGLError(
+        GL_INVALID_VALUE, "glCreateGpuMemoryBufferImageCHROMIUM", "width <= 0");
+    return 0;
+  }
+
+  if (height <= 0) {
+    SetGLError(GL_INVALID_VALUE,
+               "glCreateGpuMemoryBufferImageCHROMIUM",
+               "height <= 0");
+    return 0;
+  }
+
+  if (!ValidImageFormat(internalformat)) {
+    SetGLError(GL_INVALID_VALUE,
+               "glCreateGpuMemoryBufferImageCHROMIUM",
+               "invalid format");
+    return 0;
+  }
+
+  if (!ValidImageUsage(usage)) {
+    SetGLError(GL_INVALID_VALUE,
+               "glCreateGpuMemoryBufferImageCHROMIUM",
+               "invalid usage");
+    return 0;
+  }
+
+  // Flush the command stream to ensure ordering in case the newly
+  // returned image_id has recently been in use with a different buffer.
+  helper_->CommandBufferHelper::Flush();
+
+  // Create new buffer.
+  GLuint buffer_id = gpu_memory_buffer_tracker_->CreateBuffer(
+      width,
+      height,
+      internalformat == GL_RGBA ? GL_RGBA8_OES : GL_RGB8_OES,
+      usage);
+  if (buffer_id == 0) {
+    SetGLError(GL_OUT_OF_MEMORY,
+               "glCreateGpuMemoryBufferImageCHROMIUM",
+               "out of GPU memory");
+    return 0;
+  }
+  return buffer_id;
+}
+
+GLuint GLES2Implementation::CreateGpuMemoryBufferImageCHROMIUM(
+    GLsizei width,
+    GLsizei height,
+    GLenum internalformat,
+    GLenum usage) {
+  GPU_CLIENT_SINGLE_THREAD_CHECK();
+  GPU_CLIENT_LOG("[" << GetLogPrefix()
+                     << "] glCreateGpuMemoryBufferImageCHROMIUM(" << width
+                     << ", " << height << ", "
+                     << GLES2Util::GetStringImageInternalFormat(internalformat)
+                     << ", " << GLES2Util::GetStringImageUsage(usage) << ")");
+  GLuint image_id = CreateGpuMemoryBufferImageCHROMIUMHelper(
+      width, height, internalformat, usage);
+  CheckGLError();
+  return image_id;
+}
+
 bool GLES2Implementation::ValidateSize(const char* func, GLsizeiptr size) {
   if (size < 0) {
     SetGLError(GL_INVALID_VALUE, func, "size < 0");
     return false;
   }
   if (!FitInt32NonNegative<GLsizeiptr>(size)) {
     SetGLError(GL_INVALID_OPERATION, func, "size more than 32-bit");
     return false;
   }
   return true;
@@ skipping 11 matching lines @@
   return true;
 }
 
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "gpu/command_buffer/client/gles2_implementation_impl_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu