Subversion Repositories eco32

/*

 * 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();

}