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//
// libavg - Media Playback Engine.
// Copyright (C) 2003-2014 Ulrich von Zadow
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
// Current versions can be found at www.libavg.de
//
#include "WGLContext.h"
#include "../base/Exception.h"
#include "../base/Logger.h"
#include <SDL/SDL.h>
#undef WIN32_LEAN_AND_MEAN
#include <SDL/SDL_syswm.h>
#include <iostream>
namespace avg {
using namespace std;
using namespace boost;
LONG WINAPI imagingWindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
return DefWindowProc(hwnd, msg, wParam, lParam);
}
void registerWindowClass()
{
static char * pClassName;
if (pClassName) {
return;
}
pClassName = "GL";
HINSTANCE hInstance = GetModuleHandle(NULL);
WNDCLASS wc;
memset(&wc, 0, sizeof(WNDCLASS));
wc.style = CS_OWNDC;
wc.lpfnWndProc = (WNDPROC)imagingWindowProc;
wc.hInstance = hInstance;
wc.hIcon = LoadIcon(NULL, IDI_WINLOGO);
wc.hCursor = LoadCursor(hInstance, IDC_ARROW);
wc.hbrBackground = NULL;
wc.lpszMenuName = NULL;
wc.lpszClassName = pClassName;
BOOL bOK = RegisterClass(&wc);
AVG_ASSERT(bOK);
}
WGLContext::WGLContext(const GLConfig& glConfig, const IntPoint& windowSize,
const SDL_SysWMinfo* pSDLWMInfo)
: GLContext(windowSize, pSDLWMInfo)
{
bool bOwnsContext;
if (pSDLWMInfo) {
m_hDC = wglGetCurrentDC();
m_Context = wglGetCurrentContext();
setCurrent();
bOwnsContext = false;
} else {
registerWindowClass();
m_hwnd = CreateWindow("GL", "GL",
WS_CLIPSIBLINGS | WS_CLIPCHILDREN,
0, 0, 500, 300, 0, 0, GetModuleHandle(NULL), 0);
checkWinError(m_hwnd != 0, "CreateWindow");
m_hDC = GetDC(m_hwnd);
checkWinError(m_hDC != 0, "GetDC");
PIXELFORMATDESCRIPTOR pfd;
ZeroMemory(&pfd, sizeof(pfd));
pfd.nSize = sizeof(pfd);
pfd.nVersion = 1;
pfd.dwFlags = PFD_SUPPORT_OPENGL | PFD_DRAW_TO_WINDOW;
pfd.iPixelType = PFD_TYPE_RGBA;
pfd.cColorBits = 32;
pfd.cDepthBits = 32;
pfd.iLayerType = PFD_MAIN_PLANE;
int iFormat = ChoosePixelFormat(m_hDC, &pfd);
checkWinError(iFormat != 0, "ChoosePixelFormat");
SetPixelFormat(m_hDC, iFormat, &pfd);
m_Context = wglCreateContext(m_hDC);
checkWinError(m_Context != 0, "wglCreateContext");
bOwnsContext = true;
}
init(glConfig, bOwnsContext);
}
WGLContext::~WGLContext()
{
deleteObjects();
if (m_Context && ownsContext()) {
wglDeleteContext(m_Context);
DeleteDC(m_hDC);
DestroyWindow(m_hwnd);
}
}
void WGLContext::activate()
{
BOOL bOk = wglMakeCurrent(m_hDC, m_Context);
checkWinError(bOk, "wglMakeCurrent");
setCurrent();
}
bool WGLContext::initVBlank(int rate)
{
static bool s_bVBlankActive = false;
if (rate > 0) {
if (!queryOGLExtension("WGL_EXT_swap_control")
&& !queryWGLExtension("WGL_EXT_swap_control")) {
AVG_LOG_WARNING(
"Windows VBlank setup failed: OpenGL Extension not supported.");
s_bVBlankActive = false;
return false;
}
glproc::SwapIntervalEXT(rate);
s_bVBlankActive = true;
return true;
} else {
if (s_bVBlankActive) {
glproc::SwapIntervalEXT(0);
s_bVBlankActive = false;
}
return false;
}
}
bool WGLContext::queryWGLExtension(const char *extName)
{
if (glproc::GetExtensionsStringARB == NULL) {
return false;
}
char *p;
size_t extNameLen = strlen(extName);
p = (char *)glproc::GetExtensionsStringARB(m_hDC);
AVG_ASSERT(p != 0);
char * end = p + strlen(p);
while (p < end) {
size_t n = strcspn(p, " ");
if ((extNameLen == n) && (strncmp(extName, p, n) == 0)) {
return true;
}
p += (n + 1);
}
return false;
}
void WGLContext::checkWinError(BOOL bOK, const string& sWhere)
{
if (!bOK) {
char szErr[512];
FormatMessage((FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_FROM_SYSTEM),
0, GetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
szErr, 512, 0);
AVG_LOG_ERROR(sWhere+":"+szErr);
AVG_ASSERT(false);
}
}
}
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