Implementation for nacl is somewhat different as for other platforms,
platform needs to ensure that the previous swap has finished before
issuing GL commands or more swaps. This is done by introducing a worker
thread that does buffer swaps from a work queue and uses a semaphore to
lock main thread until swap is finished.
v2: add error messaging if pp::Graphics3D::SwapBuffers fails
add semaphore to implement blocking swap()
remove extra nacl_swapbuffers() c++ function (Chad, Emil)
v3: destroy semaphore when thread dies
Signed-off-by: Tapani Pälli <tapani.pa...@intel.com>
---
src/waffle/nacl/nacl_container.cpp | 12 +++++
src/waffle/nacl/nacl_container.h | 2 +-
src/waffle/nacl/nacl_swap_thread.h | 94 ++++++++++++++++++++++++++++++++++++++
src/waffle/nacl/nacl_window.c | 3 +-
4 files changed, 109 insertions(+), 2 deletions(-)
create mode 100644 src/waffle/nacl/nacl_swap_thread.h
diff --git a/src/waffle/nacl/nacl_container.cpp
b/src/waffle/nacl/nacl_container.cpp
index fe907ff..84ab1da 100644
--- a/src/waffle/nacl/nacl_container.cpp
+++ b/src/waffle/nacl/nacl_container.cpp
@@ -28,11 +28,13 @@
#include "ppapi/cpp/module.h"
#include "ppapi/c/pp_errors.h"
#include "nacl_container.h"
+#include "nacl_swap_thread.h"
namespace waffle {
struct nacl_container {
pp::Graphics3D *ctx;
+ NaclSwapThread *swapper;
void *glapi;
bool (*glInitializePPAPI) (PPB_GetInterface);
@@ -49,6 +51,7 @@ nacl_container_dtor(waffle::nacl_container *nc)
if (nc->glapi)
dlclose(nc->glapi);
+ delete nc->swapper;
delete nc;
}
@@ -119,6 +122,7 @@ nacl_context_init(waffle::nacl_container *nc, struct
nacl_config *cfg)
return false;
}
+ nc->swapper = new NaclSwapThread(pp_instance, nc->ctx);
return true;
}
@@ -194,3 +198,11 @@ nacl_makecurrent(nacl_container *nc, bool release)
return true;
}
+
+extern "C" bool
+nacl_swapbuffers(nacl_container *nc)
+{
+ waffle::nacl_container *cpp_nc =
+ reinterpret_cast<waffle::nacl_container*>(nc);
+ return cpp_nc->swapper->swap();
+}
diff --git a/src/waffle/nacl/nacl_container.h b/src/waffle/nacl/nacl_container.h
index ca26a1f..579856d 100644
--- a/src/waffle/nacl/nacl_container.h
+++ b/src/waffle/nacl/nacl_container.h
@@ -43,7 +43,7 @@ bool nacl_context_init(struct nacl_container *nc, struct
nacl_config *cfg);
bool nacl_resize(struct nacl_container *nc, int32_t width, int32_t height);
bool nacl_makecurrent(struct nacl_container *nc, bool release);
void nacl_context_fini(struct nacl_container *nc);
-
+bool nacl_swapbuffers(struct nacl_container *nc);
#ifdef __cplusplus
};
#endif
diff --git a/src/waffle/nacl/nacl_swap_thread.h
b/src/waffle/nacl/nacl_swap_thread.h
new file mode 100644
index 0000000..8e8687b
--- /dev/null
+++ b/src/waffle/nacl/nacl_swap_thread.h
@@ -0,0 +1,94 @@
+// Copyright 2014 Intel Corporation
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+// - Redistributions of source code must retain the above copyright notice,
this
+// list of conditions and the following disclaimer.
+//
+// - Redistributions in binary form must reproduce the above copyright notice,
+// this list of conditions and the following disclaimer in the documentation
+// and/or other materials provided with the distribution.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE
+// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY,
+// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "ppapi/cpp/graphics_3d.h"
+#include "ppapi/cpp/instance.h"
+#include "ppapi/utility/completion_callback_factory.h"
+#include "ppapi/utility/threading/simple_thread.h"
+#include "wcore_error.h"
+#include <semaphore.h>
+
+// Thread takes care that we do not issue another buffer
+// swap before previous swap has completed.
+class NaclSwapThread : public pp::SimpleThread
+{
+public:
+ explicit NaclSwapThread(const pp::InstanceHandle &instance,
+ pp::Graphics3D *_ctx) :
+ pp::SimpleThread(instance),
+ ctx(_ctx),
+ cbf(this)
+ {
+ Start();
+ sem_init(&sem, 0, 0);
+ }
+
+ ~NaclSwapThread()
+ {
+ sem_destroy(&sem);
+ message_loop().PostQuit(true);
+ }
+
+ bool swap()
+ {
+ pp::CompletionCallback cb =
+ cbf.NewCallback(&NaclSwapThread::swap_buffers);
+
+ if (message_loop().PostWork(cb) != PP_OK)
+ return false;
