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[/] [eco32/] [trunk/] [sim/] [graph.c] - Blame information for rev 270

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/*
 * graph.c -- graphics controller simulation
 */
 
 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <setjmp.h>
 
#include "common.h"
#include "console.h"
#include "error.h"
#include "except.h"
#include "graph.h"
 
 
static Bool debug = false;
static Bool volatile installed = false;
 
 
/**************************************************************/
/**************************************************************/
 
/* common definitions, global variables */
 
 
#include <pthread.h>
#include <unistd.h>
#include <time.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xatom.h>
 
 
#define WINDOW_SIZE_X           640
#define WINDOW_SIZE_Y           480
#define WINDOW_POS_X            100
#define WINDOW_POS_Y            100
 
 
#define C2B(c,ch)               (((((c) & 0xFF) * ch.scale) >> 8) * ch.factor)
#define RGB2PIXEL(r,g,b)        (0xFF000000 | \
                                 C2B(r, vga.red) | \
                                 C2B(g, vga.green) | \
                                 C2B(b, vga.blue))
 
 
typedef struct {
  unsigned long scale;
  unsigned long factor;
} ColorChannel;
 
 
typedef struct {
  int argc;
  char **argv;
  Display *display;
  Window win;
  GC gc;
  XImage *image;
  ColorChannel red, green, blue;
  XExposeEvent expose;
  XClientMessageEvent shutdown;
} VGA;
 
 
static VGA vga;
 
 
/**************************************************************/
 
/* monitor server */
 
 
static ColorChannel mask2channel(unsigned long mask) {
  unsigned long f;
  ColorChannel ch;
 
  if (mask == 0) {
    error("color mask is 0 in mask2channel");
  }
  for (f = 1; (mask & 1) == 0; f <<= 1) {
    mask >>= 1;
  }
  ch.factor = f;
  ch.scale = mask + 1;
  while ((mask & 1) != 0) {
    mask >>= 1;
  }
  if (mask != 0) {
    error("scattered color mask bits in mask2channel");
  }
  return ch;
}
 
 
static void initMonitor(int argc, char *argv[]) {
  int screenNum;
  Window rootWin;
  XVisualInfo visualTemp;
  XVisualInfo *visualInfo;
  int visualCount;
  int bestMatch;
  int bestDepth;
  Visual *visual;
  int i;
  unsigned long pixel;
  int x, y;
  Colormap colormap;
  XSetWindowAttributes attrib;
  XSizeHints *sizeHints;
  XWMHints *wmHints;
  XClassHint *classHints;
  XTextProperty windowName;
  XGCValues gcValues;
 
  /* connect to X server */
  if (XInitThreads() == 0) {
    error("no thread support for X11");
  }
  vga.display = XOpenDisplay(NULL);
  if (vga.display == NULL) {
    error("cannot connect to X server");
  }
  screenNum = DefaultScreen(vga.display);
  rootWin = RootWindow(vga.display, screenNum);
  /* find TrueColor visual */
  visualTemp.screen = screenNum;
  visualTemp.class = TrueColor;
  visualInfo = XGetVisualInfo(vga.display,
                              VisualClassMask | VisualScreenMask,
                              &visualTemp, &visualCount);
  if (visualInfo == NULL || visualCount == 0) {
    error("no TrueColor visual found");
  }
  bestMatch = 0;
  bestDepth = visualInfo[0].depth;
  visual = visualInfo[0].visual;
  for (i = 1; i < visualCount; i++) {
    if (visualInfo[i].depth > bestDepth) {
      bestMatch = i;
      bestDepth = visualInfo[i].depth;
      visual = visualInfo[i].visual;
    }
  }
  /* build color channels */
  vga.red = mask2channel(visualInfo[bestMatch].red_mask);
  vga.green = mask2channel(visualInfo[bestMatch].green_mask);
  vga.blue = mask2channel(visualInfo[bestMatch].blue_mask);
  /* create and initialize image */
  vga.image = XCreateImage(vga.display, visual, bestDepth, ZPixmap,
                           0, NULL, WINDOW_SIZE_X, WINDOW_SIZE_Y, 32, 0);
  if (vga.image == NULL) {
    error("cannot allocate image");
  }
  vga.image->data = malloc(vga.image->height * vga.image->bytes_per_line);
  if (vga.image->data == NULL) {
    error("cannot allocate image memory");
  }
  pixel = RGB2PIXEL(0, 0, 0);
  for (y = 0; y < WINDOW_SIZE_Y; y++) {
    for (x = 0; x < WINDOW_SIZE_X; x++) {
      XPutPixel(vga.image, x, y, pixel);
    }
  }
  /* allocate a colormap */
  colormap = XCreateColormap(vga.display, rootWin, visual, AllocNone);
  /* create the window */
  attrib.colormap = colormap;
  attrib.event_mask = ExposureMask;
  attrib.background_pixel = RGB2PIXEL(0, 0, 0);
  attrib.border_pixel = RGB2PIXEL(0, 0, 0);
  vga.win =
    XCreateWindow(vga.display, rootWin,
                  WINDOW_POS_X, WINDOW_POS_Y,
                  WINDOW_SIZE_X, WINDOW_SIZE_Y,
                  0, bestDepth, InputOutput, visual,
                  CWEventMask | CWColormap | CWBackPixel | CWBorderPixel,
                  &attrib);
  /* give hints to window manager */
  sizeHints = XAllocSizeHints();
  wmHints = XAllocWMHints();
  classHints = XAllocClassHint();
  if (sizeHints == NULL ||
      wmHints == NULL ||
      classHints == NULL) {
    error("hint allocation failed");
  }
  sizeHints->flags = PMinSize | PMaxSize;
  sizeHints->min_width = WINDOW_SIZE_X;
  sizeHints->min_height = WINDOW_SIZE_Y;
  sizeHints->max_width = WINDOW_SIZE_X;
  sizeHints->max_height = WINDOW_SIZE_Y;
  wmHints->flags = StateHint | InputHint;
  wmHints->input = True;
  wmHints->initial_state = NormalState;
  classHints->res_name = "ECO32";
  classHints->res_class = "ECO32";
  if (XStringListToTextProperty(&classHints->res_name, 1, &windowName) == 0) {
    error("property allocation failed");
  }
  XSetWMProperties(vga.display, vga.win, &windowName, NULL,
                   argv, argc, sizeHints, wmHints, classHints);
  /* create a GC */
  vga.gc = XCreateGC(vga.display, vga.win, 0, &gcValues);
  /* finally get the window displayed */
  XMapWindow(vga.display, vga.win);
  /* prepare expose event */
  vga.expose.type = Expose;
  vga.expose.display = vga.display;
  vga.expose.window = vga.win;
  vga.expose.x = 0;
  vga.expose.y = 0;
  vga.expose.width = WINDOW_SIZE_X;
  vga.expose.height = WINDOW_SIZE_Y;
  vga.expose.count = 0;
  /* prepare shutdown event */
  vga.shutdown.type = ClientMessage;
  vga.shutdown.display = vga.display;
  vga.shutdown.window = vga.win;
  vga.shutdown.message_type = XA_WM_COMMAND;
  vga.shutdown.format = 8;
  /* say that the graphics controller is installed */
  XSync(vga.display, False);
  installed = true;
}
 
 
static void exitMonitor(void) {
  XFreeGC(vga.display, vga.gc);
  XUnmapWindow(vga.display, vga.win);
  XDestroyWindow(vga.display, vga.win);
  XDestroyImage(vga.image);
  XCloseDisplay(vga.display);
  installed = false;
}
 
 
static int ioErrorHandler(Display *display) {
  error("connection to monitor window lost");
  /* never reached */
  return 0;
}
 
 
static void *server(void *ignore) {
  Bool run;
  XEvent event;
 
  initMonitor(vga.argc, vga.argv);
  XSetIOErrorHandler(ioErrorHandler);
  run = true;
  while (run) {
    XNextEvent(vga.display, &event);
    switch (event.type) {
      case Expose:
        XPutImage(vga.display, vga.win, vga.gc, vga.image,
                  event.xexpose.x, event.xexpose.y,
                  event.xexpose.x, event.xexpose.y,
                  event.xexpose.width, event.xexpose.height);
        break;
      case ClientMessage:
        if (event.xclient.message_type == XA_WM_COMMAND &&
            event.xclient.format == 8) {
          run = false;
        }
        break;
      default:
        break;
    }
  }
  exitMonitor();
  return NULL;
}
 
 
/**************************************************************/
 
/* refresh timer */
 
 
static Bool volatile refreshRunning = false;
 
 
static void *refresh(void *ignore) {
  struct timespec delay;
 
  while (refreshRunning) {
    XSendEvent(vga.display, vga.win, False, 0, (XEvent *) &vga.expose);
    XFlush(vga.display);
    delay.tv_sec = 0;
    delay.tv_nsec = 100 * 1000 * 1000;
    nanosleep(&delay, &delay);
  }
  return NULL;
}
 
 
/**************************************************************/
 
/* server interface */
 
 
static int myArgc = 1;
static char *myArgv[] = {
  "eco32",
  NULL
};
 
static pthread_t monitorThread;
static pthread_t refreshThread;
 
 
static void vgaInit(void) {
  /* start monitor server in a separate thread */
  vga.argc = myArgc;
  vga.argv = myArgv;
  if (pthread_create(&monitorThread, NULL, server, NULL) != 0) {
    error("cannot start monitor server");
  }
  while (!installed) ;
  /* start refresh timer in another thread */
  refreshRunning = true;
  if (pthread_create(&refreshThread, NULL, refresh, NULL) != 0) {
    error("cannot start refresh timer");
  }
}
 
 
static void vgaExit(void) {
  refreshRunning = false;
  pthread_join(refreshThread, NULL);
  XSendEvent(vga.display, vga.win, False, 0, (XEvent *) &vga.shutdown);
  XSync(vga.display, False);
  pthread_join(monitorThread, NULL);
}
 
 
static void vgaWrite(int x, int y, int r, int g, int b) {
  XPutPixel(vga.image, x, y, RGB2PIXEL(r, g, b));
}
 
 
/**************************************************************/
/**************************************************************/
 
 
#define BACKGROUND              0
#define FOREGROUND              1
 
 
static int colors[2] = {
  0x007CD4D6,                   /* background */
  0x00000000                    /* foreground */
};
 
 
static int splashData[] = {
#include "grsplash"
};
 
 
static void loadSplashScreen(void) {
  int sum, i;
  int count;
  int plane;
  int x, y;
  int r, g, b;
 
  /* check splash data */
  sum = 0;
  for (i = 0; i < sizeof(splashData)/sizeof(splashData[0]); i++) {
    sum += splashData[i];
  }
  if (sum != WINDOW_SIZE_X * WINDOW_SIZE_Y) {
    return;
  }
  /* display splash data */
  count = 0;
  plane = FOREGROUND;
  i = 0;
  for (y = 0; y < WINDOW_SIZE_Y; y++) {
    for (x = 0; x < WINDOW_SIZE_X; x++) {
      while (count == 0) {
        plane = (plane == BACKGROUND ? FOREGROUND : BACKGROUND);
        r = (colors[plane] >> 16) & 0xFF;
        g = (colors[plane] >>  8) & 0xFF;
        b = (colors[plane] >>  0) & 0xFF;
        count = splashData[i++];
      }
      count--;
      vgaWrite(x, y, r, g, b);
    }
  }
}
 
 
/**************************************************************/
 
 
Word graphRead(Word addr) {
  Word data;
 
  if (debug) {
    cPrintf("\n**** GRAPH READ from 0x%08X", addr);
  }
  if (!installed) {
    throwException(EXC_BUS_TIMEOUT);
  }
  if (addr >= WINDOW_SIZE_X * WINDOW_SIZE_Y * 4) {
    throwException(EXC_BUS_TIMEOUT);
  }
  /* the frame buffer memory yields 0 on every read */
  data = 0;
  if (debug) {
    cPrintf(", data = 0x%08X ****\n", data);
  }
  return data;
}
 
 
void graphWrite(Word addr, Word data) {
  if (debug) {
    cPrintf("\n**** GRAPH WRITE to 0x%08X, data = 0x%08X ****\n",
            addr, data);
  }
  if (!installed) {
    throwException(EXC_BUS_TIMEOUT);
  }
  if (addr >= WINDOW_SIZE_X * WINDOW_SIZE_Y * 4) {
    throwException(EXC_BUS_TIMEOUT);
  }
  /* write to frame buffer memory */
  vgaWrite((addr >> 2) % WINDOW_SIZE_X,
           (addr >> 2) / WINDOW_SIZE_X,
           (data >> 16) & 0xFF,
           (data >>  8) & 0xFF,
           (data >>  0) & 0xFF);
}
 
 
void graphReset(void) {
  if (!installed) {
    return;
  }
  cPrintf("Resetting Graphics...\n");
  loadSplashScreen();
}
 
 
void graphInit(void) {
  vgaInit();
  graphReset();
}
 
 
void graphExit(void) {
  if (!installed) {
    return;
  }
  vgaExit();
}

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Subversion Repositories eco32

[/] [eco32/] [trunk/] [sim/] [graph.c] - Blame information for rev 270

Line No.	Rev	Author	Line
1	8	hellwig	`/*`
2			`* graph.c -- graphics controller simulation`
3			`*/`
4
5
6			`#include <stdio.h>`
7			`#include <stdlib.h>`
8			`#include <string.h>`
9			`#include <setjmp.h>`
10
11			`#include "common.h"`
12			`#include "console.h"`
13			`#include "error.h"`
14			`#include "except.h"`
15			`#include "graph.h"`
16
17
18			`static Bool debug = false;`
19	251	hellwig	`static Bool volatile installed = false;`
20	8	hellwig
21
22			`/**************************************************************/`
23			`/**************************************************************/`
24
25			`/* common definitions, global variables */`
26
27
28			`#include <pthread.h>`
29			`#include <unistd.h>`
30			`#include <time.h>`
31			`#include <X11/Xlib.h>`
32			`#include <X11/Xutil.h>`
33			`#include <X11/Xatom.h>`
34
35
36			`#define WINDOW_SIZE_X 640`
37			`#define WINDOW_SIZE_Y 480`
38			`#define WINDOW_POS_X 100`
39			`#define WINDOW_POS_Y 100`
40
41
42			`#define C2B(c,ch) (((((c) & 0xFF) * ch.scale) >> 8) * ch.factor)`
43	251	hellwig	`#define RGB2PIXEL(r,g,b) (0xFF000000 \| \`
44			`C2B(r, vga.red) \| \`
45	8	hellwig	`C2B(g, vga.green) \| \`
46			`C2B(b, vga.blue))`
47
48
49			`typedef struct {`
50			`unsigned long scale;`
51			`unsigned long factor;`
52			`} ColorChannel;`
53
54
55			`typedef struct {`
56			`int argc;`
57			`char **argv;`
58			`Display *display;`
59			`Window win;`
60			`GC gc;`
61			`XImage *image;`
62			`ColorChannel red, green, blue;`
63			`XExposeEvent expose;`
64			`XClientMessageEvent shutdown;`
65			`} VGA;`
66
67
68			`static VGA vga;`
69
70
71			`/**************************************************************/`
72
73			`/* monitor server */`
74
75
76			`static ColorChannel mask2channel(unsigned long mask) {`
77			`unsigned long f;`
78			`ColorChannel ch;`
79
80			`if (mask == 0) {`
81			`error("color mask is 0 in mask2channel");`
82			`}`
83			`for (f = 1; (mask & 1) == 0; f <<= 1) {`
84			`mask >>= 1;`
85			`}`
86			`ch.factor = f;`
87			`ch.scale = mask + 1;`
88			`while ((mask & 1) != 0) {`
89			`mask >>= 1;`
90			`}`
91			`if (mask != 0) {`
92			`error("scattered color mask bits in mask2channel");`
93			`}`
94			`return ch;`
95			`}`
96
97
98			`static void initMonitor(int argc, char *argv[]) {`
99			`int screenNum;`
100			`Window rootWin;`
101			`XVisualInfo visualTemp;`
102			`XVisualInfo *visualInfo;`
103			`int visualCount;`
104			`int bestMatch;`
105			`int bestDepth;`
106			`Visual *visual;`
107			`int i;`
108			`unsigned long pixel;`
109			`int x, y;`
110			`Colormap colormap;`
111			`XSetWindowAttributes attrib;`
112			`XSizeHints *sizeHints;`
113			`XWMHints *wmHints;`
114			`XClassHint *classHints;`
115			`XTextProperty windowName;`
116			`XGCValues gcValues;`
117
118			`/* connect to X server */`
119			`if (XInitThreads() == 0) {`
120			`error("no thread support for X11");`
121			`}`
122			`vga.display = XOpenDisplay(NULL);`
123			`if (vga.display == NULL) {`
124			`error("cannot connect to X server");`
125			`}`
126			`screenNum = DefaultScreen(vga.display);`
127			`rootWin = RootWindow(vga.display, screenNum);`
128			`/* find TrueColor visual */`
129			`visualTemp.screen = screenNum;`
130			`visualTemp.class = TrueColor;`
131			`visualInfo = XGetVisualInfo(vga.display,`
132			`VisualClassMask \| VisualScreenMask,`
133			`&visualTemp, &visualCount);`
134			`if (visualInfo == NULL \|\| visualCount == 0) {`
135			`error("no TrueColor visual found");`
136			`}`
137			`bestMatch = 0;`
138			`bestDepth = visualInfo[0].depth;`
139			`visual = visualInfo[0].visual;`
140			`for (i = 1; i < visualCount; i++) {`
141			`if (visualInfo[i].depth > bestDepth) {`
142			`bestMatch = i;`
143			`bestDepth = visualInfo[i].depth;`
144			`visual = visualInfo[i].visual;`
145			`}`
146			`}`
147			`/* build color channels */`
148			`vga.red = mask2channel(visualInfo[bestMatch].red_mask);`
149			`vga.green = mask2channel(visualInfo[bestMatch].green_mask);`
150			`vga.blue = mask2channel(visualInfo[bestMatch].blue_mask);`
151			`/* create and initialize image */`
152			`vga.image = XCreateImage(vga.display, visual, bestDepth, ZPixmap,`
153			`0, NULL, WINDOW_SIZE_X, WINDOW_SIZE_Y, 32, 0);`
154			`if (vga.image == NULL) {`
155			`error("cannot allocate image");`
156			`}`
157			`vga.image->data = malloc(vga.image->height * vga.image->bytes_per_line);`
158			`if (vga.image->data == NULL) {`
159			`error("cannot allocate image memory");`
160			`}`
161			`pixel = RGB2PIXEL(0, 0, 0);`
162			`for (y = 0; y < WINDOW_SIZE_Y; y++) {`
163			`for (x = 0; x < WINDOW_SIZE_X; x++) {`
164			`XPutPixel(vga.image, x, y, pixel);`
165			`}`
166			`}`
167			`/* allocate a colormap */`
168			`colormap = XCreateColormap(vga.display, rootWin, visual, AllocNone);`
169			`/* create the window */`
170			`attrib.colormap = colormap;`
171			`attrib.event_mask = ExposureMask;`
172			`attrib.background_pixel = RGB2PIXEL(0, 0, 0);`
173			`attrib.border_pixel = RGB2PIXEL(0, 0, 0);`
174			`vga.win =`
175			`XCreateWindow(vga.display, rootWin,`
176			`WINDOW_POS_X, WINDOW_POS_Y,`
177			`WINDOW_SIZE_X, WINDOW_SIZE_Y,`
178			`0, bestDepth, InputOutput, visual,`
179			`CWEventMask \| CWColormap \| CWBackPixel \| CWBorderPixel,`
180			`&attrib);`
181			`/* give hints to window manager */`
182			`sizeHints = XAllocSizeHints();`
183			`wmHints = XAllocWMHints();`
184			`classHints = XAllocClassHint();`
185			`if (sizeHints == NULL \|\|`
186			`wmHints == NULL \|\|`
187			`classHints == NULL) {`
188			`error("hint allocation failed");`
189			`}`
190			`sizeHints->flags = PMinSize \| PMaxSize;`
191			`sizeHints->min_width = WINDOW_SIZE_X;`
192			`sizeHints->min_height = WINDOW_SIZE_Y;`
193			`sizeHints->max_width = WINDOW_SIZE_X;`
194			`sizeHints->max_height = WINDOW_SIZE_Y;`
195			`wmHints->flags = StateHint \| InputHint;`
196			`wmHints->input = True;`
197			`wmHints->initial_state = NormalState;`
198			`classHints->res_name = "ECO32";`
199			`classHints->res_class = "ECO32";`
200			`if (XStringListToTextProperty(&classHints->res_name, 1, &windowName) == 0) {`
201			`error("property allocation failed");`
202			`}`
203			`XSetWMProperties(vga.display, vga.win, &windowName, NULL,`
204			`argv, argc, sizeHints, wmHints, classHints);`
205			`/* create a GC */`
206			`vga.gc = XCreateGC(vga.display, vga.win, 0, &gcValues);`
207			`/* finally get the window displayed */`
208			`XMapWindow(vga.display, vga.win);`
209			`/* prepare expose event */`
210			`vga.expose.type = Expose;`
211			`vga.expose.display = vga.display;`
212			`vga.expose.window = vga.win;`
213			`vga.expose.x = 0;`
214			`vga.expose.y = 0;`
215			`vga.expose.width = WINDOW_SIZE_X;`
216			`vga.expose.height = WINDOW_SIZE_Y;`
217			`vga.expose.count = 0;`
218			`/* prepare shutdown event */`
219			`vga.shutdown.type = ClientMessage;`
220			`vga.shutdown.display = vga.display;`
221			`vga.shutdown.window = vga.win;`
222			`vga.shutdown.message_type = XA_WM_COMMAND;`
223	251	hellwig	`vga.shutdown.format = 8;`
224	8	hellwig	`/* say that the graphics controller is installed */`
225			`XSync(vga.display, False);`
226			`installed = true;`
227			`}`
228
229
230			`static void exitMonitor(void) {`
231			`XFreeGC(vga.display, vga.gc);`
232			`XUnmapWindow(vga.display, vga.win);`
233			`XDestroyWindow(vga.display, vga.win);`
234			`XDestroyImage(vga.image);`
235			`XCloseDisplay(vga.display);`
236			`installed = false;`
237			`}`
238
239
240			`static int ioErrorHandler(Display *display) {`
241			`error("connection to monitor window lost");`
242			`/* never reached */`
243			`return 0;`
244			`}`
245
246
247			`static void server(void ignore) {`
248			`Bool run;`
249			`XEvent event;`
250
251			`initMonitor(vga.argc, vga.argv);`
252			`XSetIOErrorHandler(ioErrorHandler);`
253			`run = true;`
254			`while (run) {`
255			`XNextEvent(vga.display, &event);`
256			`switch (event.type) {`
257			`case Expose:`
258			`XPutImage(vga.display, vga.win, vga.gc, vga.image,`
259			`event.xexpose.x, event.xexpose.y,`
260			`event.xexpose.x, event.xexpose.y,`
261			`event.xexpose.width, event.xexpose.height);`
262			`break;`
263			`case ClientMessage:`
264			`if (event.xclient.message_type == XA_WM_COMMAND &&`
265	251	hellwig	`event.xclient.format == 8) {`
266	8	hellwig	`run = false;`
267			`}`
268			`break;`
269			`default:`
270			`break;`
271			`}`
272			`}`
273			`exitMonitor();`
274			`return NULL;`
275			`}`
276
277
278			`/**************************************************************/`
279
280			`/* refresh timer */`
281
282
283	251	hellwig	`static Bool volatile refreshRunning = false;`
284	8	hellwig
285
286			`static void refresh(void ignore) {`
287			`struct timespec delay;`
288
289			`while (refreshRunning) {`
290			`XSendEvent(vga.display, vga.win, False, 0, (XEvent *) &vga.expose);`
291			`XFlush(vga.display);`
292			`delay.tv_sec = 0;`
293			`delay.tv_nsec = 100 * 1000 * 1000;`
294			`nanosleep(&delay, &delay);`
295			`}`
296			`return NULL;`
297			`}`
298
299
300			`/**************************************************************/`
301
302			`/* server interface */`
303
304
305			`static int myArgc = 1;`
306			`static char *myArgv[] = {`
307			`"eco32",`
308			`NULL`
309			`};`
310
311	251	hellwig	`static pthread_t monitorThread;`
312			`static pthread_t refreshThread;`
313	8	hellwig
314	251	hellwig
315	8	hellwig	`static void vgaInit(void) {`
316			`/* start monitor server in a separate thread */`
317			`vga.argc = myArgc;`
318			`vga.argv = myArgv;`
319	251	hellwig	`if (pthread_create(&monitorThread, NULL, server, NULL) != 0) {`
320	8	hellwig	`error("cannot start monitor server");`
321			`}`
322	251	hellwig	`while (!installed) ;`
323	8	hellwig	`/* start refresh timer in another thread */`
324			`refreshRunning = true;`
325	251	hellwig	`if (pthread_create(&refreshThread, NULL, refresh, NULL) != 0) {`
326	8	hellwig	`error("cannot start refresh timer");`
327			`}`
328			`}`
329
330
331			`static void vgaExit(void) {`
332			`refreshRunning = false;`
333	251	hellwig	`pthread_join(refreshThread, NULL);`
334	8	hellwig	`XSendEvent(vga.display, vga.win, False, 0, (XEvent *) &vga.shutdown);`
335			`XSync(vga.display, False);`
336	251	hellwig	`pthread_join(monitorThread, NULL);`
337	8	hellwig	`}`
338
339
340			`static void vgaWrite(int x, int y, int r, int g, int b) {`
341			`XPutPixel(vga.image, x, y, RGB2PIXEL(r, g, b));`
342			`}`
343
344
345			`/**************************************************************/`
346			`/**************************************************************/`
347
348
349			`#define BACKGROUND 0`
350			`#define FOREGROUND 1`
351
352
353			`static int colors[2] = {`
354			`0x007CD4D6, /* background */`
355			`0x00000000 /* foreground */`
356			`};`
357
358
359			`static int splashData[] = {`
360			`#include "grsplash"`
361			`};`
362
363
364			`static void loadSplashScreen(void) {`
365			`int sum, i;`
366			`int count;`
367			`int plane;`
368			`int x, y;`
369			`int r, g, b;`
370
371			`/* check splash data */`
372			`sum = 0;`
373			`for (i = 0; i < sizeof(splashData)/sizeof(splashData[0]); i++) {`
374			`sum += splashData[i];`
375			`}`
376			`if (sum != WINDOW_SIZE_X * WINDOW_SIZE_Y) {`
377			`return;`
378			`}`
379			`/* display splash data */`
380			`count = 0;`
381			`plane = FOREGROUND;`
382			`i = 0;`
383			`for (y = 0; y < WINDOW_SIZE_Y; y++) {`
384			`for (x = 0; x < WINDOW_SIZE_X; x++) {`
385			`while (count == 0) {`
386			`plane = (plane == BACKGROUND ? FOREGROUND : BACKGROUND);`
387			`r = (colors[plane] >> 16) & 0xFF;`
388			`g = (colors[plane] >> 8) & 0xFF;`
389			`b = (colors[plane] >> 0) & 0xFF;`
390			`count = splashData[i++];`
391			`}`
392			`count--;`
393			`vgaWrite(x, y, r, g, b);`
394			`}`
395			`}`
396			`}`
397
398
399			`/**************************************************************/`
400
401
402			`Word graphRead(Word addr) {`
403			`Word data;`
404
405			`if (debug) {`
406			`cPrintf("\n**** GRAPH READ from 0x%08X", addr);`
407			`}`
408			`if (!installed) {`
409			`throwException(EXC_BUS_TIMEOUT);`
410			`}`
411			`if (addr >= WINDOW_SIZE_X * WINDOW_SIZE_Y * 4) {`
412			`throwException(EXC_BUS_TIMEOUT);`
413			`}`
414			`/* the frame buffer memory yields 0 on every read */`
415			`data = 0;`
416			`if (debug) {`
417			`cPrintf(", data = 0x%08X ****\n", data);`
418			`}`
419			`return data;`
420			`}`
421
422
423			`void graphWrite(Word addr, Word data) {`
424			`if (debug) {`
425			`cPrintf("\n** GRAPH WRITE to 0x%08X, data = 0x%08X **\n",`
426			`addr, data);`
427			`}`
428			`if (!installed) {`
429			`throwException(EXC_BUS_TIMEOUT);`
430			`}`
431			`if (addr >= WINDOW_SIZE_X * WINDOW_SIZE_Y * 4) {`
432			`throwException(EXC_BUS_TIMEOUT);`
433			`}`
434			`/* write to frame buffer memory */`
435			`vgaWrite((addr >> 2) % WINDOW_SIZE_X,`
436			`(addr >> 2) / WINDOW_SIZE_X,`
437			`(data >> 16) & 0xFF,`
438			`(data >> 8) & 0xFF,`
439			`(data >> 0) & 0xFF);`
440			`}`
441
442
443			`void graphReset(void) {`
444			`if (!installed) {`
445			`return;`
446			`}`
447			`cPrintf("Resetting Graphics...\n");`
448			`loadSplashScreen();`
449			`}`
450
451
452			`void graphInit(void) {`
453			`vgaInit();`
454			`graphReset();`
455			`}`
456
457
458			`void graphExit(void) {`
459			`if (!installed) {`
460			`return;`
461			`}`
462			`vgaExit();`
463			`}`