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// Copyright (c) 2011 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.
// This file implements a standalone executable demo of using GLES2 over
// command buffers. This code is temporary as the setup that happens
// here is in a state of flux. Eventually there will be several versions of
// setup, one for trusted code, one for pepper, one for NaCl, and maybe others.
#include <windows.h>
#include <windowsx.h>
#include <shellapi.h>
#include <stdlib.h>
#include <stdio.h>
#include "base/at_exit.h"
#include "base/command_line.h"
#include "base/callback.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/message_loop.h"
#include "base/shared_memory.h"
#include "gpu/command_buffer/service/gpu_processor.h"
#include "gpu/command_buffer/service/command_buffer_service.h"
#include "gpu/command_buffer/client/gles2_implementation.h"
#include "gpu/command_buffer/client/gles2_lib.h"
#include "gpu/command_buffer/client/gles2_demo_c.h"
#include "gpu/command_buffer/client/gles2_demo_cc.h"
#include "ui/gfx/gl/gl_context.h"
using base::SharedMemory;
using gpu::Buffer;
using gpu::GPUProcessor;
using gpu::CommandBufferService;
using gpu::gles2::GLES2CmdHelper;
using gpu::gles2::GLES2Implementation;
#if defined(OS_WIN)
HINSTANCE g_instance;
#endif
class GLES2Demo {
public:
GLES2Demo();
bool GLES2Demo::Setup(void* hwnd, int32 size);
private:
DISALLOW_COPY_AND_ASSIGN(GLES2Demo);
};
GLES2Demo::GLES2Demo() {
}
bool GLES2Demo::Setup(void* hwnd, int32 size) {
scoped_ptr<CommandBufferService> command_buffer(new CommandBufferService);
if (!command_buffer->Initialize(size))
return NULL;
GPUProcessor* gpu_processor = new GPUProcessor(command_buffer.get(), NULL);
if (!gpu_processor->Initialize(reinterpret_cast<HWND>(hwnd),
gfx::Size(),
gpu::gles2::DisallowedExtensions(),
NULL,
std::vector<int32>(),
NULL,
0)) {
return NULL;
}
command_buffer->SetPutOffsetChangeCallback(
NewCallback(gpu_processor, &GPUProcessor::ProcessCommands));
GLES2CmdHelper* helper = new GLES2CmdHelper(command_buffer.get());
if (!helper->Initialize(size)) {
// TODO(gman): cleanup.
return false;
}
size_t transfer_buffer_size = 512 * 1024;
int32 transfer_buffer_id =
command_buffer->CreateTransferBuffer(transfer_buffer_size, -1);
Buffer transfer_buffer =
command_buffer->GetTransferBuffer(transfer_buffer_id);
if (!transfer_buffer.ptr)
return false;
gles2::Initialize();
gles2::SetGLContext(new GLES2Implementation(helper,
transfer_buffer.size,
transfer_buffer.ptr,
transfer_buffer_id,
false));
GLFromCPPInit();
return command_buffer.release() != NULL;
}
#if defined(OS_WIN)
LRESULT CALLBACK WindowProc(
HWND hwnd, UINT msg, WPARAM w_param, LPARAM l_param) {
switch (msg) {
case WM_CLOSE:
DestroyWindow(hwnd);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
case WM_PAINT: {
GLFromCPPDraw();
GLFromCDraw();
// TODO(gman): Not sure how SwapBuffer should be exposed.
gles2::GetGLContext()->SwapBuffers();
break;
}
default:
return ::DefWindowProc(hwnd, msg, w_param, l_param);
}
return 0;
}
void ProcessMessages(void* in_hwnd) {
HWND hwnd = reinterpret_cast<HWND>(in_hwnd);
MSG msg;
bool done = false;
while (!done) {
while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {
if (msg.message == WM_QUIT) {
done = true;
}
// dispatch the message
TranslateMessage(&msg);
DispatchMessage(&msg);
}
if (!done) {
InvalidateRect(hwnd, NULL, TRUE);
}
}
}
#endif
void* SetupWindow() {
#if defined(OS_WIN)
WNDCLASSEX wc = {0};
wc.lpszClassName = L"MY_WINDOWS_CLASS";
wc.cbSize = sizeof(WNDCLASSEX);
wc.style = CS_HREDRAW | CS_VREDRAW;
wc.lpfnWndProc = ::WindowProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = g_instance;
wc.hIcon = ::LoadIcon(g_instance, IDI_APPLICATION);
wc.hIconSm = NULL;
wc.hCursor = ::LoadCursor(g_instance, IDC_ARROW);
wc.hbrBackground = static_cast<HBRUSH>(::GetStockObject(BLACK_BRUSH));
wc.lpszMenuName = NULL;
if (!::RegisterClassEx(&wc))
return false;
// Leaving this window onscreen leads to a redraw error which makes it
// a hassle to debug tests in an IDE, so we place the window somewhere that
// won't happen.
HWND hwnd = ::CreateWindowExW(
NULL,
wc.lpszClassName,
L"",
WS_OVERLAPPEDWINDOW,
10,
0,
512,
512,
0,
0,
g_instance,
0);
if (hwnd == NULL) {
return false;
}
::ShowWindow(hwnd, SW_SHOWNORMAL);
return hwnd;
#else
#error Need code.
#endif
}
#if defined(OS_WIN)
int WINAPI WinMain(HINSTANCE instance,
HINSTANCE prev_instance,
LPSTR command_line,
int command_show) {
g_instance = instance;
int argc = 1;
const char* const argv[] = {
"gles2_demo.exe"
};
#else
int main(int argc, char** argv) {
#endif
CommandLine::Init(argc, argv);
const int32 kCommandBufferSize = 1024 * 1024;
base::AtExitManager at_exit_manager;
MessageLoopForUI message_loop;
gfx::GLContext::InitializeOneOff();
GLES2Demo* demo = new GLES2Demo();
void* hwnd = SetupWindow();
if (!hwnd) {
::fprintf(stdout, "Could not setup window.\n");
return EXIT_FAILURE;
}
demo->Setup(hwnd, kCommandBufferSize);
ProcessMessages(hwnd);
return EXIT_SUCCESS;
}
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