//
// OpenGL window
//

#include <stdio.h>
#include <gtk/gtk.h>
#include <gdk/gdkx.h>
#include "lc_global.h"
#include "opengl.h"
#include "glwindow.h"
#include "defines.h"
#include "system.h"

struct GLWindowPrivate
{
	GtkWidget  *widget;
	Display*   xdisplay;
	GLXContext context;
	LC_CURSOR_TYPE Cursor;
	bool Multisample;
};

// =============================================================================
// static functions

static gint realize_event(GtkWidget *widget, gpointer data)
{
	GLWindow *wnd = (GLWindow*)data;

	wnd->MakeCurrent();
	wnd->OnInitialUpdate();

	return TRUE;
}

static gint expose_event(GtkWidget *widget, GdkEventExpose *event, gpointer data)
{
	GLWindow *wnd = (GLWindow*)data;

	if (event->count > 0)
		return TRUE;

	wnd->OnDraw();

	return TRUE;
}

static gint button_press_event(GtkWidget *widget, GdkEventButton *event, gpointer data)
{
  GLWindow *wnd = (GLWindow*)data;
  int x, y;

  x = (int)event->x;
  y = widget->allocation.height - (int)event->y - 1;

  if (event->type == GDK_BUTTON_PRESS)
  {
    if (event->button == 1)
      wnd->OnLeftButtonDown (x, y, (event->state & GDK_CONTROL_MASK) != 0,
                             (event->state & GDK_SHIFT_MASK) != 0);
    else if (event->button == 3)
      wnd->OnRightButtonDown (x, y, (event->state & GDK_CONTROL_MASK) != 0,
                              (event->state & GDK_SHIFT_MASK) != 0);
  }
  else if (event->type == GDK_2BUTTON_PRESS)
  {
    wnd->OnLeftButtonDoubleClick (x, y, (event->state & GDK_CONTROL_MASK) != 0,
                                  (event->state & GDK_SHIFT_MASK) != 0);
  }

  gtk_window_set_focus (GTK_WINDOW (gtk_widget_get_toplevel (widget)), widget);
  gdk_pointer_grab (widget->window, FALSE, (GdkEventMask)(GDK_BUTTON_PRESS_MASK|GDK_BUTTON_RELEASE_MASK|
                    GDK_POINTER_MOTION_MASK|GDK_POINTER_MOTION_HINT_MASK),
                    NULL, NULL, GDK_CURRENT_TIME);

  return TRUE;
}

static gint button_release_event (GtkWidget *widget, GdkEventButton *event, gpointer data)
{
  GLWindow *wnd = (GLWindow*)data;
  int x, y;

  x = (int)event->x;
  y = widget->allocation.height - (int)event->y - 1;

  gdk_pointer_ungrab (GDK_CURRENT_TIME);

  if (event->button == 1)
    wnd->OnLeftButtonUp (x, y, (event->state & GDK_CONTROL_MASK) != 0,
                         (event->state & GDK_SHIFT_MASK) != 0);
  else if (event->button == 3)
    wnd->OnRightButtonUp (x, y, (event->state & GDK_CONTROL_MASK) != 0,
                          (event->state & GDK_SHIFT_MASK) != 0);

  return TRUE;
}

static gint pointer_motion_event (GtkWidget *widget, GdkEventMotion *event, gpointer data)
{
  GLWindow *wnd = (GLWindow*)data;
  GdkModifierType state;
  int x, y;

  if (event->is_hint)
  {
    gdk_window_get_pointer (event->window, &x, &y, &state);
    state = (GdkModifierType)0;
  }
  else
  {
    x = (int)event->x;
    y = (int)event->y;
    state = (GdkModifierType)event->state;
  }

  y = widget->allocation.height - y - 1;

  wnd->OnMouseMove (x, y, (event->state & GDK_CONTROL_MASK) != 0, (event->state & GDK_SHIFT_MASK) != 0);

  return TRUE;
}

static gint size_allocate_event (GtkWidget *widget, GtkAllocation *allocation, gpointer data)
{
  GLWindow *wnd = (GLWindow*)data;

  wnd->OnSize (allocation->width, allocation->height);

  return TRUE;
}
/*
static void destroy_event (GtkWidget *widget, gpointer data)
{
  GLWindow *wnd = (GLWindow*)data;

  wnd->DestroyContext ();
}
*/

void GL_InitializeExtensions()
{
}

// =============================================================================
// GLWindow class

GLWindow::GLWindow(GLWindow *share)
{
	m_pShare = share;
	m_pData = g_malloc(sizeof(GLWindowPrivate));
	memset(m_pData, 0, sizeof(GLWindowPrivate));
}

GLWindow::~GLWindow()
{
	DestroyContext();
	g_free(m_pData);
}

bool GLWindow::CreateFromWindow (void *data)
{
	int attrlist[] = { GLX_RGBA, GLX_DOUBLEBUFFER, GLX_DEPTH_SIZE, 16, 0 };
	GLWindowPrivate *prv = (GLWindowPrivate*)m_pData;
	Display *dpy = GDK_DISPLAY();
	GdkVisual *visual;
	XVisualInfo *vi = NULL;

	// choose visual
	visual = gdk_visual_get_system();
	if (visual->depth < 16)
		printf("OpenGL fatal error: LeoCAD needs a display with at least 16 bit colors.\n");

	if (dpy == NULL)
	{
		printf("OpenGL fatal error: Cannot get display.\n");
		return false;
	}
	prv->xdisplay = dpy;

	int AASamples = Sys_ProfileLoadInt("Default", "AASamples", 1);

	if (AASamples > 1)
	{
		int attrlistAA[] = { GLX_RGBA, GLX_DOUBLEBUFFER, GLX_DEPTH_SIZE, 16, GLX_SAMPLE_BUFFERS_ARB, 1, GLX_SAMPLES_ARB, AASamples, 0 };
		vi = pfnglXChooseVisual(dpy, DefaultScreen(dpy), attrlistAA);

		if (vi)
			prv->Multisample = true;
		else
			printf("OpenGL error: Could not find multisample visual.\n");
	}

	if (!vi)
	{
		vi = pfnglXChooseVisual(dpy, DefaultScreen(dpy), attrlist);
		if (vi == NULL)
		{
			printf("OpenGL fatal error: glXChooseVisual failed.\n");
			return false;
		}
	}

	visual = gdkx_visual_get(vi->visualid);
	if (visual == NULL)
	{
		printf("OpenGL fatal error: Cannot get visual.\n");
		return false;
	}

	gtk_widget_push_colormap(gdk_colormap_new(visual, TRUE));
	gtk_widget_push_visual(visual);

	prv->widget = gtk_drawing_area_new();
	gtk_widget_set_double_buffered(GTK_WIDGET(prv->widget), FALSE);

	if (m_pShare == NULL)
		prv->context = pfnglXCreateContext(dpy, vi, NULL, True);
	else
	{
		GLWindowPrivate *share = (GLWindowPrivate*)m_pShare->m_pData;

		prv->context = pfnglXCreateContext(dpy, vi, share->context, True);
	}

	gtk_widget_pop_visual();
	gtk_widget_pop_colormap();

	XFree(vi);

	GTK_WIDGET_SET_FLAGS(prv->widget, GTK_CAN_FOCUS);

	gtk_widget_set_events(GTK_WIDGET(prv->widget), GDK_EXPOSURE_MASK | GDK_BUTTON_PRESS_MASK |
	                      GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK);

	// Connect signal handlers
	gtk_signal_connect(GTK_OBJECT(prv->widget), "expose_event", GTK_SIGNAL_FUNC(expose_event), this);
//	gtk_signal_connect(GTK_OBJECT(prv->widget), "destroy", GTK_SIGNAL_FUNC(destroy_event), this);
	gtk_signal_connect(GTK_OBJECT(prv->widget), "size_allocate", GTK_SIGNAL_FUNC(size_allocate_event), this);
	gtk_signal_connect(GTK_OBJECT(prv->widget), "motion_notify_event", GTK_SIGNAL_FUNC(pointer_motion_event), this);
	gtk_signal_connect(GTK_OBJECT(prv->widget), "button_press_event", GTK_SIGNAL_FUNC(button_press_event), this);
	gtk_signal_connect(GTK_OBJECT(prv->widget), "button_release_event", GTK_SIGNAL_FUNC(button_release_event), this);
	gtk_signal_connect(GTK_OBJECT(prv->widget), "realize", GTK_SIGNAL_FUNC(realize_event), this);

	*((GtkWidget**)data) = prv->widget;

	return true;
}

void GLWindow::DestroyContext()
{
	GLWindowPrivate *prv = (GLWindowPrivate*)m_pData;

	if (prv->context == pfnglXGetCurrentContext())
		pfnglXMakeCurrent(prv->xdisplay, None, NULL);

	if (prv->context)
		pfnglXDestroyContext(prv->xdisplay, prv->context);

	prv->context = NULL;
}

void GLWindow::OnInitialUpdate()
{
	GLWindowPrivate *prv = (GLWindowPrivate*)m_pData;

	MakeCurrent();

	GL_InitializeSharedExtensions();
//  GL_InitializeExtensions();

	if (prv->Multisample)
		glEnable(GL_MULTISAMPLE_ARB);
}

bool GLWindow::MakeCurrent()
{
	GLWindowPrivate *prv = (GLWindowPrivate*)m_pData;
	gboolean ret = false;

	if (prv->context)
		ret = pfnglXMakeCurrent(prv->xdisplay, GDK_WINDOW_XWINDOW(prv->widget->window), prv->context);

	return ret;
}

void GLWindow::SwapBuffers()
{
	GLWindowPrivate *prv = (GLWindowPrivate*)m_pData;

	if (prv->context)
		pfnglXSwapBuffers(GDK_WINDOW_XDISPLAY(prv->widget->window), GDK_WINDOW_XWINDOW(prv->widget->window));
}

void GLWindow::Redraw(bool ForceRedraw)
{
  GLWindowPrivate *prv = (GLWindowPrivate*)m_pData;

  gtk_widget_draw(prv->widget, (GdkRectangle*)NULL);
}

void GLWindow::CaptureMouse()
{
}

void GLWindow::ReleaseMouse()
{
}

static void create_bitmap_and_mask_from_xpm (GdkBitmap **bitmap, GdkBitmap **mask, const char **xpm)
{
  int height, width, colors;
  char pixmap_buffer [(32 * 32)/8];
  char mask_buffer [(32 * 32)/8];
  int x, y, pix;
  int transparent_color, black_color;

  sscanf (xpm [0], "%d %d %d %d", &height, &width, &colors, &pix);

  g_assert (height == 32);
  g_assert (width  == 32);
  g_assert (colors == 3);

  transparent_color = ' ';
  black_color = '.';

  for (y = 0; y < 32; y++)
    for (x = 0; x < 32;)
    {
      char value = 0, maskv = 0;

      for (pix = 0; pix < 8; pix++, x++)
	if (xpm [4+y][x] != transparent_color)
	{
	  maskv |= 1 << pix;

	  if (xpm [4+y][x] != black_color)
	    value |= 1 << pix;
	}

      pixmap_buffer [(y * 4 + x/8)-1] = value;
      mask_buffer [(y * 4 + x/8)-1] = maskv;
    }

  *bitmap = gdk_bitmap_create_from_data (NULL, pixmap_buffer, 32, 32);
  *mask   = gdk_bitmap_create_from_data (NULL, mask_buffer, 32, 32);
}

void GLWindow::SetCursor(LC_CURSOR_TYPE Type)
{
#include "pixmaps/cr_brick.xpm"
#include "pixmaps/cr_light.xpm"
#include "pixmaps/cr_spot.xpm"
#include "pixmaps/cr_cam.xpm"
#include "pixmaps/cr_sel.xpm"
#include "pixmaps/cr_selm.xpm"
#include "pixmaps/cr_move.xpm"
#include "pixmaps/cr_rot.xpm"
#include "pixmaps/cr_paint.xpm"
#include "pixmaps/cr_erase.xpm"
#include "pixmaps/cr_pan.xpm"
#include "pixmaps/cr_rotv.xpm"
#include "pixmaps/cr_roll.xpm"
#include "pixmaps/cr_zoom.xpm"
#include "pixmaps/cr_zoomr.xpm"

	// TODO: Missing LC_CURSOR_ROTATEX and LC_CURSOR_ROTATEY.
	// TODO: Auto-generate xpms from bmps in the Makefile.
	const char** Cursors[LC_CURSOR_COUNT] =
	{
		NULL,     // LC_CURSOR_DEFAULT
		cr_brick, // LC_CURSOR_BRICK
		cr_light, // LC_CURSOR_LIGHT
		cr_spot,  // LC_CURSOR_SPOTLIGHT
		cr_cam,   // LC_CURSOR_CAMERA
		cr_sel,   // LC_CURSOR_SELECT
		cr_selm,  // LC_CURSOR_SELECT_GROUP
		cr_move,  // LC_CURSOR_MOVE
		cr_rot,   // LC_CURSOR_ROTATE
		cr_rot,   // LC_CURSOR_ROTATEX
		cr_rot,   // LC_CURSOR_ROTATEY
		cr_erase, // LC_CURSOR_DELETE
		cr_paint, // LC_CURSOR_PAINT
		cr_zoom,  // LC_CURSOR_ZOOM
		cr_zoomr, // LC_CURSOR_ZOOM_REGION
		cr_pan,   // LC_CURSOR_PAN
		cr_roll,  // LC_CURSOR_ROLL
		cr_rotv,  // LC_CURSOR_ROTATE_VIEW
	};

	int Offsets[LC_CURSOR_COUNT][2] =
	{
		{  0,  0 }, // LC_CURSOR_DEFAULT
		{  8,  3 }, // LC_CURSOR_BRICK
		{ 15, 15 }, // LC_CURSOR_LIGHT
		{  7, 10 }, // LC_CURSOR_SPOTLIGHT
		{ 15,  9 }, // LC_CURSOR_CAMERA
		{  0,  2 }, // LC_CURSOR_SELECT
		{  0,  2 }, // LC_CURSOR_SELECT_GROUP
		{ 15, 15 }, // LC_CURSOR_MOVE
		{ 15, 15 }, // LC_CURSOR_ROTATE
		{ 15, 15 }, // LC_CURSOR_ROTATEX
		{ 15, 15 }, // LC_CURSOR_ROTATEY
		{  0, 10 }, // LC_CURSOR_DELETE
		{ 14, 14 }, // LC_CURSOR_PAINT
		{ 15, 15 }, // LC_CURSOR_ZOOM
		{  9,  9 }, // LC_CURSOR_ZOOM_REGION
		{ 15, 15 }, // LC_CURSOR_PAN
		{ 15, 15 }, // LC_CURSOR_ROLL
		{ 15, 15 }, // LC_CURSOR_ROTATE_VIEW
	};

	GLWindowPrivate *prv = (GLWindowPrivate*)m_pData;

	if (prv->Cursor == Type)
		return;

	const char** xpm = Cursors[Type];
	int x = Offsets[Type][0];
	int y = Offsets[Type][1];

	GdkBitmap *bitmap;
	GdkBitmap *mask;
	GdkCursor *cursor;
	GdkColor white = {0, 0xffff, 0xffff, 0xffff};
	GdkColor black = {0, 0x0000, 0x0000, 0x0000};

	if (xpm != NULL)
	{
		create_bitmap_and_mask_from_xpm(&bitmap, &mask, xpm);
		cursor = gdk_cursor_new_from_pixmap(bitmap, mask, &white, &black, x, y);
		gdk_window_set_cursor(prv->widget->window, cursor);
	}
	else
	{
		cursor = gdk_cursor_new(GDK_LEFT_PTR);
		gdk_window_set_cursor(prv->widget->window, cursor);
		gdk_cursor_destroy(cursor);
	}

	prv->Cursor = Type;
}