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// Copyright (c) 2010 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 "gpu/demos/framework/window.h"
#include "gpu/command_buffer/client/gles2_implementation.h"
#include "gpu/command_buffer/client/gles2_lib.h"
#include "gpu/command_buffer/service/command_buffer_service.h"
#include "gpu/command_buffer/service/gpu_processor.h"
#include "gpu/demos/framework/demo_factory.h"
using gpu::Buffer;
using gpu::CommandBufferService;
using gpu::GPUProcessor;
using gpu::gles2::GLES2CmdHelper;
using gpu::gles2::GLES2Implementation;
// TODO(alokp): Make this class cross-platform. Investigate using SDL.
namespace {
const int32 kCommandBufferSize = 1024 * 1024;
const int32 kTransferBufferSize = 512 * 1024;
LRESULT CALLBACK WindowProc(HWND hwnd, UINT msg,
WPARAM w_param, LPARAM l_param) {
LRESULT result = 0;
switch (msg) {
case WM_CLOSE:
::DestroyWindow(hwnd);
break;
case WM_DESTROY:
::PostQuitMessage(0);
break;
case WM_ERASEBKGND:
break;
case WM_PAINT: {
gpu::demos::Window* window = reinterpret_cast<gpu::demos::Window*>(
GetWindowLongPtr(hwnd, GWL_USERDATA));
if (window != NULL) window->OnPaint();
::ValidateRect(hwnd, NULL);
break;
}
default:
result = ::DefWindowProc(hwnd, msg, w_param, l_param);
break;
}
return result;
}
HWND CreateNativeWindow(const wchar_t* title, int width, int height,
LONG_PTR user_data) {
WNDCLASS wnd_class = {0};
HINSTANCE instance = GetModuleHandle(NULL);
wnd_class.style = CS_OWNDC;
wnd_class.lpfnWndProc = WindowProc;
wnd_class.hInstance = instance;
wnd_class.hbrBackground =
reinterpret_cast<HBRUSH>(GetStockObject(BLACK_BRUSH));
wnd_class.lpszClassName = L"gpu_demo";
if (!RegisterClass(&wnd_class)) return NULL;
DWORD wnd_style = WS_VISIBLE | WS_POPUP | WS_BORDER | WS_SYSMENU | WS_CAPTION;
RECT wnd_rect;
wnd_rect.left = 0;
wnd_rect.top = 0;
wnd_rect.right = width;
wnd_rect.bottom = height;
AdjustWindowRect(&wnd_rect, wnd_style, FALSE);
HWND hwnd = CreateWindow(
wnd_class.lpszClassName,
title,
wnd_style,
0,
0,
wnd_rect.right - wnd_rect.left,
wnd_rect.bottom - wnd_rect.top,
NULL,
NULL,
instance,
NULL);
if (hwnd == NULL) return NULL;
ShowWindow(hwnd, SW_SHOWNORMAL);
// Set this to the GWL_USERDATA so that it is available to WindowProc.
SetWindowLongPtr(hwnd, GWL_USERDATA, user_data);
return hwnd;
}
bool InitRenderContext(HWND hwnd) {
CHECK(hwnd);
scoped_ptr<CommandBufferService> command_buffer(new CommandBufferService);
if (!command_buffer->Initialize(kCommandBufferSize)) {
return false;
}
scoped_refptr<GPUProcessor> gpu_processor(
new GPUProcessor(command_buffer.get()));
if (!gpu_processor->Initialize(hwnd)) {
return false;
}
command_buffer->SetPutOffsetChangeCallback(
NewCallback(gpu_processor.get(), &GPUProcessor::ProcessCommands));
GLES2CmdHelper* helper = new GLES2CmdHelper(command_buffer.get());
if (!helper->Initialize()) {
// TODO(alokp): cleanup.
return false;
}
int32 transfer_buffer_id =
command_buffer->CreateTransferBuffer(kTransferBufferSize);
Buffer transfer_buffer =
command_buffer->GetTransferBuffer(transfer_buffer_id);
if (transfer_buffer.ptr == NULL) return false;
gles2::Initialize();
gles2::SetGLContext(new GLES2Implementation(helper,
transfer_buffer.size,
transfer_buffer.ptr,
transfer_buffer_id));
return command_buffer.release() != NULL;
}
} // namespace.
namespace gpu {
namespace demos {
Window::Window()
: window_handle_(NULL),
demo_(CreateDemo()) {
}
Window::~Window() {
}
bool Window::Init(int width, int height) {
window_handle_ = CreateNativeWindow(demo_->Title(), width, height,
reinterpret_cast<LONG_PTR>(this));
if (window_handle_ == NULL) return false;
if (!InitRenderContext(window_handle_)) return false;
demo_->InitWindowSize(width, height);
return demo_->InitGL();
}
void Window::MainLoop() {
MSG msg;
bool done = false;
while (!done) {
while (::PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {
if (msg.message == WM_QUIT) done = true;
::TranslateMessage(&msg);
::DispatchMessage(&msg);
}
// Message queue is empty and application has not quit yet - keep painting.
if (!done) ::UpdateWindow(window_handle_);
}
}
void Window::OnPaint() {
demo_->Draw();
::gles2::GetGLContext()->SwapBuffers();
}
} // namespace demos
} // namespace gpu
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