// Copyright (C) 2003-2009 Dolphin Project.

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 2.0.

// This program 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 General Public License 2.0 for more details.

// A copy of the GPL 2.0 should have been included with the program.
// If not, see http://www.gnu.org/licenses/

// Official SVN repository and contact information can be found at
// http://code.google.com/p/dolphin-emu/

#include "main.h"
#include "SWVideoConfig.h"
#include "IniFile.h"
#include "Setup.h"
#include "ConfigManager.h"
#include "Core.h"
#include "Host.h"

#include "GLUtil.h"

#if defined(_WIN32)
#include "Win32.h"
static HDC hDC = NULL;       // Private GDI Device Context
static HGLRC hRC = NULL;     // Permanent Rendering Context
extern HINSTANCE g_hInstance;
#else
GLWindow GLWin;
#endif

// Handles OpenGL and the window

// Window dimensions.
static int s_backbuffer_width;
static int s_backbuffer_height;

static void*& VideoWindowHandle()
{
	return SConfig::GetInstance().m_LocalCoreStartupParameter.hMainWindow;
}

void OpenGL_SwapBuffers()
{
#if defined(USE_WX) && USE_WX
	GLWin.glCanvas->SwapBuffers();
#elif defined(_WIN32)
	SwapBuffers(hDC);
#elif defined(HAVE_X11) && HAVE_X11
	glXSwapBuffers(GLWin.dpy, GLWin.win);
#endif
}

u32 OpenGL_GetBackbufferWidth() 
{
	return s_backbuffer_width;
}

u32 OpenGL_GetBackbufferHeight() 
{
	return s_backbuffer_height;
}

void OpenGL_SetWindowText(const char *text)
{
#if defined(USE_WX) && USE_WX
	// Handled by Host_UpdateTitle()
#elif defined(_WIN32)
	// TODO convert text to unicode and change SetWindowTextA to SetWindowText
	SetWindowTextA(EmuWindow::GetWnd(), text);
#elif defined(HAVE_X11) && HAVE_X11
	// Tell X to ask the window manager to set the window title.
	// (X itself doesn't provide window title functionality.)
	XStoreName(GLWin.dpy, GLWin.win, text);
#endif
}

// Draw messages on top of the screen
unsigned int Callback_PeekMessages()
{
#ifdef _WIN32
	// TODO: peekmessage
	MSG msg;
	while (PeekMessage(&msg, 0, 0, 0, PM_REMOVE))
	{
		if (msg.message == WM_QUIT)
			return FALSE;
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}
	return TRUE;
#else
	return FALSE;
#endif
}

// Show the current FPS
void UpdateFPSDisplay(const char *text)
{
	char temp[100];
	snprintf(temp, sizeof temp, "%s | Software | %s", svn_rev_str, text);
	OpenGL_SetWindowText(temp);
}

// Create rendering window.
//		Call browser: Core.cpp:EmuThread() > main.cpp:Video_Initialize()
bool OpenGL_Create(int _twidth, int _theight)
{
	int xPos, yPos;
	Core::Callback_VideoGetWindowSize(xPos, yPos, _twidth, _theight);

#if defined(_WIN32)
	EmuWindow::SetSize(_twidth, _theight);
#endif

	// Control window size and picture scaling
	s_backbuffer_width = _twidth;
	s_backbuffer_height = _theight;

#if defined(USE_WX) && USE_WX
	GLWin.panel = (wxPanel*)VideoWindowHandle();
	GLWin.glCanvas = new wxGLCanvas(GLWin.panel, wxID_ANY, NULL,
		wxPoint(0, 0), wxSize(_twidth, _theight));
	GLWin.glCanvas->Show(true);
	if (GLWin.glCtxt == NULL) // XXX dirty hack
		GLWin.glCtxt = new wxGLContext(GLWin.glCanvas);

#elif defined(_WIN32)
	// Create rendering window in Windows
	VideoWindowHandle() = (void*)EmuWindow::Create((HWND)VideoWindowHandle(), g_hInstance, _T("Please wait..."));

	// Show the window
	EmuWindow::Show();

	if (VideoWindowHandle() == NULL)
	{
		Host_SysMessage("failed to create window");
		return false;
	}

	GLuint      PixelFormat;            // Holds The Results After Searching For A Match
	DWORD       dwExStyle;              // Window Extended Style
	DWORD       dwStyle;                // Window Style

	RECT rcdesktop;
	GetWindowRect(GetDesktopWindow(), &rcdesktop);

	dwExStyle = WS_EX_APPWINDOW | WS_EX_WINDOWEDGE;
	dwStyle = WS_OVERLAPPEDWINDOW;

	RECT rc = {0, 0, s_backbuffer_width, s_backbuffer_height};
	AdjustWindowRectEx(&rc, dwStyle, FALSE, dwExStyle);

	int X = (rcdesktop.right-rcdesktop.left)/2 - (rc.right-rc.left)/2;
	int Y = (rcdesktop.bottom-rcdesktop.top)/2 - (rc.bottom-rc.top)/2;

	// EmuWindow::GetWnd() is either the new child window or the new separate window
	SetWindowPos(EmuWindow::GetWnd(), NULL, X, Y, rc.right-rc.left, rc.bottom-rc.top, SWP_NOREPOSITION | SWP_NOZORDER);

	PIXELFORMATDESCRIPTOR pfd =              // pfd Tells Windows How We Want Things To Be
	{
		sizeof(PIXELFORMATDESCRIPTOR),              // Size Of This Pixel Format Descriptor
		1,                                          // Version Number
		PFD_DRAW_TO_WINDOW |                        // Format Must Support Window
			PFD_SUPPORT_OPENGL |                        // Format Must Support OpenGL
			PFD_DOUBLEBUFFER,                           // Must Support Double Buffering
		PFD_TYPE_RGBA,                              // Request An RGBA Format
		32,                                         // Select Our Color Depth
		0, 0, 0, 0, 0, 0,                           // Color Bits Ignored
		0,                                          // 8bit Alpha Buffer
		0,                                          // Shift Bit Ignored
		0,                                          // No Accumulation Buffer
		0, 0, 0, 0,                                 // Accumulation Bits Ignored
		24,                                         // 24Bit Z-Buffer (Depth Buffer)  
		8,                                          // 8bit Stencil Buffer
		0,                                          // No Auxiliary Buffer
		PFD_MAIN_PLANE,                             // Main Drawing Layer
		0,                                          // Reserved
		0, 0, 0                                     // Layer Masks Ignored
	};

	if (!(hDC=GetDC(EmuWindow::GetWnd()))) {
		PanicAlert("(1) Can't create an OpenGL Device context. Fail.");
		return false;
	}

	if (!(PixelFormat = ChoosePixelFormat(hDC,&pfd))) {
		PanicAlert("(2) Can't find a suitable PixelFormat.");
		return false;
	}

	if (!SetPixelFormat(hDC, PixelFormat, &pfd)) {
		PanicAlert("(3) Can't set the PixelFormat.");
		return false;
	}

	if (!(hRC = wglCreateContext(hDC))) {
		PanicAlert("(4) Can't create an OpenGL rendering context.");
		return false;
	}
	// --------------------------------------

#elif defined(HAVE_X11) && HAVE_X11
	XVisualInfo *vi;
	Colormap cmap;
	int glxMajorVersion, glxMinorVersion;
	Atom wmDelete;

	// attributes for a single buffered visual in RGBA format with at least
	// 8 bits per color and a 24 bit depth buffer
	int attrListSgl[] = {GLX_RGBA, GLX_RED_SIZE, 8,
		GLX_GREEN_SIZE, 8,
		GLX_BLUE_SIZE, 8,
		GLX_DEPTH_SIZE, 24,
		None};

	// attributes for a double buffered visual in RGBA format with at least
	// 8 bits per color and a 24 bit depth buffer
	int attrListDbl[] = { GLX_RGBA, GLX_DOUBLEBUFFER,
		GLX_RED_SIZE, 8,
		GLX_GREEN_SIZE, 8,
		GLX_BLUE_SIZE, 8,
		GLX_DEPTH_SIZE, 24,
		GLX_SAMPLE_BUFFERS_ARB, GLX_SAMPLES_ARB, 1, None };

	int attrListDefault[] = {
		GLX_RGBA,
		GLX_RED_SIZE, 1,
		GLX_GREEN_SIZE, 1,
		GLX_BLUE_SIZE, 1,
		GLX_DOUBLEBUFFER,
		GLX_DEPTH_SIZE, 1,
		None };

	GLWin.dpy = XOpenDisplay(0);
	GLWin.parent = (Window)g_VideoInitialize.pWindowHandle;
	GLWin.screen = DefaultScreen(GLWin.dpy);

	// Get an appropriate visual
	vi = glXChooseVisual(GLWin.dpy, GLWin.screen, attrListDbl);
	if (vi == NULL)
	{
		vi = glXChooseVisual(GLWin.dpy, GLWin.screen, attrListSgl);
		if (vi != NULL)
		{
			ERROR_LOG(VIDEO, "Only Singlebuffered Visual!");
		}
		else
		{
			vi = glXChooseVisual(GLWin.dpy, GLWin.screen, attrListDefault);
			if (vi == NULL)
			{
				ERROR_LOG(VIDEO, "Could not choose visual (glXChooseVisual)");
				exit(0);
			}
		}
	}
	else
		NOTICE_LOG(VIDEO, "Got Doublebuffered Visual!");

	glXQueryVersion(GLWin.dpy, &glxMajorVersion, &glxMinorVersion);
	NOTICE_LOG(VIDEO, "glX-Version %d.%d", glxMajorVersion, glxMinorVersion);
	// Create a GLX context.
	GLWin.ctx = glXCreateContext(GLWin.dpy, vi, 0, GL_TRUE);
	if(!GLWin.ctx)
	{
		PanicAlert("Couldn't Create GLX context.Quit");
		exit(0); // TODO: Don't bring down entire Emu
	}

	if (GLWin.parent == 0)
		GLWin.parent = RootWindow(GLWin.dpy, vi->screen);
	// Create a color map.
	cmap = XCreateColormap(GLWin.dpy, GLWin.parent, vi->visual, AllocNone);
	GLWin.attr.colormap = cmap;
	GLWin.attr.border_pixel = 0;
	XkbSetDetectableAutoRepeat(GLWin.dpy, True, NULL);

	// Create a window in window mode
	GLWin.attr.event_mask = ExposureMask | KeyPressMask | KeyReleaseMask |
		StructureNotifyMask | EnterWindowMask | LeaveWindowMask | FocusChangeMask;
	GLWin.win = XCreateWindow(GLWin.dpy, GLWin.parent,
			xPos, yPos, _twidth, _theight, 0, vi->depth, InputOutput, vi->visual,
			CWBorderPixel | CWColormap | CWEventMask, &GLWin.attr);
	// Only set window title and handle wm_delete_events if in windowed mode
	wmDelete = XInternAtom(GLWin.dpy, "WM_DELETE_WINDOW", True);
	XSetWMProtocols(GLWin.dpy, GLWin.win, &wmDelete, 1);
	XSetStandardProperties(GLWin.dpy, GLWin.win, "GPU",
			"GPU", None, NULL, 0, NULL);
	XMapRaised(GLWin.dpy, GLWin.win);

	g_VideoInitialize.pWindowHandle = (void *)GLWin.win;
#endif
	return true;
}

bool OpenGL_MakeCurrent()
{
#if defined(USE_WX) && USE_WX
	return GLWin.glCanvas->SetCurrent(*GLWin.glCtxt);
#elif defined(_WIN32)
	return wglMakeCurrent(hDC,hRC) ? true : false;
#elif defined(HAVE_X11) && HAVE_X11
	Core::Callback_VideoGetWindowSize(GLWin.x, GLWin.y, (int&)GLWin.width, (int&)GLWin.height);
	XMoveResizeWindow(GLWin.dpy, GLWin.win, GLWin.x, GLWin.y, GLWin.width, GLWin.height);
	return glXMakeCurrent(GLWin.dpy, GLWin.win, GLWin.ctx);
#endif
	return true;
}
// Update window width, size and etc. Called from Render.cpp
void OpenGL_Update()
{
#if defined(USE_WX) && USE_WX
	int width, height;

	GLWin.panel->GetSize(&width, &height);
	if (width == s_backbuffer_width && height == s_backbuffer_height)
		return;

	GLWin.glCanvas->SetFocus();
	GLWin.glCanvas->SetSize(0, 0, width, height);
	GLWin.glCtxt->SetCurrent(*GLWin.glCanvas);
	s_backbuffer_width = width;
	s_backbuffer_height = height;

#elif defined(_WIN32)
	RECT rcWindow;
	if (!EmuWindow::GetParentWnd())
	{
		// We are not rendering to a child window - use client size.
		GetClientRect(EmuWindow::GetWnd(), &rcWindow);
	}
	else
	{
		// We are rendering to a child window - use parent size.
		GetWindowRect(EmuWindow::GetParentWnd(), &rcWindow);
	}

	// Get the new window width and height
	// See below for documentation
	int width = rcWindow.right - rcWindow.left;
	int height = rcWindow.bottom - rcWindow.top;

	// If we are rendering to a child window
	if (EmuWindow::GetParentWnd() != 0)
		::MoveWindow(EmuWindow::GetWnd(), 0, 0, width, height, FALSE);

	s_backbuffer_width = width;
	s_backbuffer_height = height;

#elif defined(HAVE_X11) && HAVE_X11
	// We just check all of our events here
	XEvent event;
	int num_events;
	for (num_events = XPending(GLWin.dpy);num_events > 0;num_events--) {
		XNextEvent(GLWin.dpy, &event);
		switch(event.type) {
			case ConfigureNotify:
				Window winDummy;
				unsigned int borderDummy, depthDummy;
				XGetGeometry(GLWin.dpy, GLWin.win, &winDummy, &GLWin.x, &GLWin.y,
						&GLWin.width, &GLWin.height, &borderDummy, &depthDummy);
				s_backbuffer_width = GLWin.width;
				s_backbuffer_height = GLWin.height;
				break;
			case ClientMessage:
				if ((unsigned long) event.xclient.data.l[0] == XInternAtom(GLWin.dpy, "WM_DELETE_WINDOW", False))
					g_VideoInitialize.pCoreMessage(WM_USER_STOP);
				if ((unsigned long) event.xclient.data.l[0] == XInternAtom(GLWin.dpy, "RESIZE", False))
					XMoveResizeWindow(GLWin.dpy, GLWin.win, event.xclient.data.l[1],
							event.xclient.data.l[2], event.xclient.data.l[3], event.xclient.data.l[4]);
				return;
				break;
			default:
				break;
		}
	}
	return;
#endif
}


// Close plugin
void OpenGL_Shutdown()
{
#if defined(USE_WX) && USE_WX
	GLWin.glCanvas->Hide();
	// XXX GLWin.glCanvas->Destroy();
	// XXX delete GLWin.glCtxt;
#elif defined(_WIN32)
	if (hRC)                                            // Do We Have A Rendering Context?
	{
		if (!wglMakeCurrent(NULL,NULL))                 // Are We Able To Release The DC And RC Contexts?
		{
			// [F|RES]: if this fails i dont see the message box and
			// cant get out of the modal state so i disable it.
			// This function fails only if i render to main window
			// MessageBox(NULL,"Release Of DC And RC Failed.", "SHUTDOWN ERROR", MB_OK | MB_ICONINFORMATION);
		}

		if (!wglDeleteContext(hRC))                     // Are We Able To Delete The RC?
		{
			ERROR_LOG(VIDEO, "Release Rendering Context Failed.");
		}
		hRC = NULL;                                       // Set RC To NULL
	}

	if (hDC && !ReleaseDC(EmuWindow::GetWnd(), hDC))      // Are We Able To Release The DC
	{
		ERROR_LOG(VIDEO, "Release Device Context Failed.");
		hDC = NULL;                                       // Set DC To NULL
	}
#elif defined(HAVE_X11) && HAVE_X11
	if (GLWin.ctx)
	{
		if (!glXMakeCurrent(GLWin.dpy, None, NULL))
		{
			ERROR_LOG(VIDEO, "Could not release drawing context.\n");
		}
		XUnmapWindow(GLWin.dpy, GLWin.win);
		glXDestroyContext(GLWin.dpy, GLWin.ctx);
		XCloseDisplay(GLWin.dpy);
		GLWin.ctx = NULL;
	}
#endif
}

GLuint OpenGL_ReportGLError(const char *function, const char *file, int line)
{
	GLint err = glGetError();
	if (err != GL_NO_ERROR)
	{
		ERROR_LOG(VIDEO, "%s:%d: (%s) OpenGL error 0x%x - %s\n", file, line, function, err, gluErrorString(err));
	}
	return err;
}

void OpenGL_ReportARBProgramError()
{
	const GLubyte* pstr = glGetString(GL_PROGRAM_ERROR_STRING_ARB);
	if (pstr != NULL && pstr[0] != 0)
	{
		GLint loc = 0;
		glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &loc);
		ERROR_LOG(VIDEO, "program error at %d: ", loc);
		ERROR_LOG(VIDEO, "%s", (char*)pstr);
		ERROR_LOG(VIDEO, "\n");
	}
}

bool OpenGL_ReportFBOError(const char *function, const char *file, int line)
{
	unsigned int fbo_status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
	if (fbo_status != GL_FRAMEBUFFER_COMPLETE_EXT)
	{
		const char *error = "-";
		switch (fbo_status)
		{
			case GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT_EXT:          error = "INCOMPLETE_ATTACHMENT_EXT"; break;
			case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT_EXT:  error = "INCOMPLETE_MISSING_ATTACHMENT_EXT"; break;
			case GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT:          error = "INCOMPLETE_DIMENSIONS_EXT"; break;
			case GL_FRAMEBUFFER_INCOMPLETE_FORMATS_EXT:             error = "INCOMPLETE_FORMATS_EXT"; break;
			case GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER_EXT:         error = "INCOMPLETE_DRAW_BUFFER_EXT"; break;
			case GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER_EXT:         error = "INCOMPLETE_READ_BUFFER_EXT"; break;
			case GL_FRAMEBUFFER_UNSUPPORTED_EXT:                    error = "UNSUPPORTED_EXT"; break;
		}
		ERROR_LOG(VIDEO, "%s:%d: (%s) OpenGL FBO error - %s\n", file, line, function, error);
		return false;
	}
	return true;
}