Expose MGL interface through NaCl IRT

mojo/public/platform/nacl/mgl_irt.cc

Index: mojo/public/platform/nacl/mgl_irt.cc
diff --git a/mojo/public/platform/nacl/mgl_irt.cc b/mojo/public/platform/nacl/mgl_irt.cc
new file mode 100644
index 0000000000000000000000000000000000000000..8ce1c6b0c782f02bf52d2db4d261d772cc8cb324
--- /dev/null
+++ b/mojo/public/platform/nacl/mgl_irt.cc
@@ -0,0 +1,119 @@
+// Copyright 2015 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.
+
+#include "mojo/public/platform/nacl/mgl_irt.h"
+#include "native_client/src/untrusted/irt/irt.h"
+
+namespace {
+
+bool g_irt_mgl_valid = false;
+struct nacl_irt_mgl g_irt_mgl;
+
+struct nacl_irt_mgl* GetIrtMGL() {
+  if (!g_irt_mgl_valid) {
+    size_t rc = nacl_interface_query(NACL_IRT_MGL_v0_1, &g_irt_mgl,
+                                     sizeof(g_irt_mgl));
+    if (rc != sizeof(g_irt_mgl))
+      return NULL;

[Mark Seaborn, 2015/10/21 04:55:49]

This can become 'nullptr' in Chromium-style code

[Petr Hosek, 2015/10/21 16:33:21]

Done.

+    g_irt_mgl_valid = true;
+  }
+  return &g_irt_mgl;
+}
+
+bool g_irt_mgl_onscreen_valid = false;
+struct nacl_irt_mgl_onscreen g_irt_mgl_onscreen;
+
+struct nacl_irt_mgl_onscreen* GetIrtMGLOnScreen() {
+  if (!g_irt_mgl_onscreen_valid) {
+    size_t rc = nacl_interface_query(NACL_IRT_MGL_ONSCREEN_v0_1,
+                                     &g_irt_mgl_onscreen,
+                                     sizeof(g_irt_mgl_onscreen));
+    if (rc != sizeof(g_irt_mgl_onscreen))
+      return NULL;
+    g_irt_mgl_onscreen_valid = true;
+  }
+  return &g_irt_mgl_onscreen;
+}
+
+bool g_irt_mgl_signal_sync_point_valid = false;
+struct nacl_irt_mgl_signal_sync_point g_irt_mgl_signal_sync_point;
+
+struct nacl_irt_mgl_signal_sync_point* GetIrtMGLSignalSyncPoint() {
+  if (!g_irt_mgl_signal_sync_point_valid) {
+    size_t rc = nacl_interface_query(NACL_IRT_MGL_SIGNAL_SYNC_POINT_v0_1,
+                                     &g_irt_mgl_signal_sync_point,
+                                     sizeof(g_irt_mgl_signal_sync_point));
+    if (rc != sizeof(g_irt_mgl_signal_sync_point))
+      return NULL;
+    g_irt_mgl_signal_sync_point_valid = true;
+  }
+  return &g_irt_mgl_signal_sync_point;
+}
+
+}
+
+MGLContext MGLCreateContext(MGLOpenGLAPIVersion version,
+                            MojoHandle command_buffer_handle,
+                            MGLContext share_group,
+                            MGLContextLostCallback lost_callback,
+                            void* lost_callback_closure,
+                            const struct MojoAsyncWaiter* async_waiter) {
+  struct nacl_irt_mgl* irt_mgl = GetIrtMGL();
+  if (irt_mgl == NULL)

[Mark Seaborn, 2015/10/21 04:55:49]

In Chromium-style code you can just do "if (!irt_mgl)"

And similarly, "if (irt_mgl)" below.

[Petr Hosek, 2015/10/21 16:33:21]

Done.

+    return MGL_NO_CONTEXT;
+  return irt_mgl->MGLCreateContext(version,
+                                   command_buffer_handle,
+                                   share_group,
+                                   lost_callback,
+                                   lost_callback_closure,
+                                   async_waiter);
+}
+
+void MGLDestroyContext(MGLContext context) {
+  struct nacl_irt_mgl* irt_mgl = GetIrtMGL();
+  if (irt_mgl != NULL)
+    irt_mgl->MGLDestroyContext(context);
+}
+
+void MGLMakeCurrent(MGLContext context) {
+  struct nacl_irt_mgl* irt_mgl = GetIrtMGL();
+  if (irt_mgl != NULL)
+    irt_mgl->MGLMakeCurrent(context);
+}
+
+MGLContext MGLGetCurrentContext(void) {
+  struct nacl_irt_mgl* irt_mgl = GetIrtMGL();
+  if (irt_mgl == NULL)
+    return MGL_NO_CONTEXT;
+  return irt_mgl->MGLGetCurrentContext();
+}
+
+MGLMustCastToProperFunctionPointerType MGLGetProcAddress(const char* name) {
+  struct nacl_irt_mgl* irt_mgl = GetIrtMGL();
+  if (irt_mgl == NULL)
+    return NULL;
+  return irt_mgl->MGLGetProcAddress(name);
+}
+
+void MGLResizeSurface(uint32_t width, uint32_t height) {
+  struct nacl_irt_mgl_onscreen* irt_mgl_onscreen = GetIrtMGLOnScreen();
+  if (irt_mgl_onscreen != NULL)
+    irt_mgl_onscreen->MGLResizeSurface(width, height);
+}
+
+void MGLSwapBuffers(void) {
+  struct nacl_irt_mgl_onscreen* irt_mgl_onscreen = GetIrtMGLOnScreen();
+  if (irt_mgl_onscreen != NULL)
+    irt_mgl_onscreen->MGLSwapBuffers();
+}
+
+void MGLSignalSyncPoint(uint32_t sync_point,
+                        MGLSignalSyncPointCallback callback,
+                        void* closure) {
+  struct nacl_irt_mgl_signal_sync_point *irt_mgl_signal_sync_point =
+      GetIrtMGLSignalSyncPoint();
+  if (irt_mgl_signal_sync_point != NULL)
+    irt_mgl_signal_sync_point->MGLSignalSyncPoint(
+        sync_point, callback, closure);
+}