Add X11 frontend

frontend_x11.c

@@ -0,0 +1,183 @@
+/** @file frontend_sdl.c
+  X11 frontend for Licar.
+*/
+
+#include <X11/Xlib.h>
+#include <X11/keysym.h>
+#include <X11/Xutil.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <sys/time.h>
+#include <unistd.h> // for usleep
+
+#define LCR_SETTING_LOG_LEVEL 2
+#define LCR_SETTING_RESOLUTION_X 320
+#define LCR_SETTING_RESOLUTION_Y 240
+#define LCR_SETTING_MUSIC 0
+
+#define DATA_FILE_NAME "data"
+
+#include "game.h"
+
+char framebuffer[LCR_SETTING_RESOLUTION_X * LCR_SETTING_RESOLUTION_Y * 4];
+FILE *dataFile = 0;
+uint8_t buttonStates[8];
+
+void LCR_drawPixel(unsigned long index, uint16_t color)
+{
+  char *p = framebuffer + 4 * index;
+
+  *p = (color << 3) & 0xff;
+  p++;
+  *p = (color >> 3) & 0xfc;
+  p++;
+  *p = (color >> 8) & 0xf8;
+}
+
+char LCR_getNextDataFileChar(void)
+{
+  if (!dataFile)
+    return 0;
+
+  int c = fgetc(dataFile);
+
+  if (c == EOF)
+  {
+    rewind(dataFile);
+    return 0;
+  }
+
+  return c;
+}
+
+void LCR_appendDataStr(const char *str)
+{
+  if (!dataFile)
+    return;
+
+  if (str == 0 || *str == 0)
+    rewind(dataFile);
+  else
+  {
+    fclose(dataFile);
+    
+    dataFile = fopen(DATA_FILE_NAME,"a");
+    
+    if (dataFile)
+    {
+      fprintf(dataFile,"%s",str);
+      fclose(dataFile);
+      dataFile = fopen(DATA_FILE_NAME,"r");
+    }
+  }
+}
+
+uint8_t LCR_keyPressed(uint8_t key)
+{
+  return buttonStates[key % 8];
+}
+
+void LCR_sleep(uint16_t timeMs)
+{
+  usleep(timeMs * 1000);
+}
+
+void LCR_log(const char *str)
+{
+  printf("LOG: %s\n",str);
+}
+
+int main(int argc, char **argv)
+{
+  int running = 1;
+  struct timeval now;
+
+  LCR_gameInit(argc,(const char **) argv);
+
+  Display *display = XOpenDisplay(0);
+  int screen = DefaultScreen(display);
+  
+  dataFile = fopen(DATA_FILE_NAME,"r");
+
+  if (!dataFile)
+    LCR_log("couldn't open data file");
+
+  Window window = XCreateSimpleWindow(display,RootWindow(display,screen),10,10,
+    LCR_SETTING_RESOLUTION_X,LCR_SETTING_RESOLUTION_Y,1,
+    BlackPixel(display,screen),WhitePixel(display,screen));
+
+  XSizeHints *sizeHints = XAllocSizeHints();
+  sizeHints->flags = PMaxSize | PMinSize;
+  sizeHints->max_width = LCR_SETTING_RESOLUTION_X;
+  sizeHints->min_width = LCR_SETTING_RESOLUTION_X;
+  sizeHints->max_height = LCR_SETTING_RESOLUTION_Y;
+  sizeHints->min_height = LCR_SETTING_RESOLUTION_Y;
+  XSetWMNormalHints(display,window,sizeHints);
+  XFree(sizeHints);
+
+  XMapWindow(display,window);
+
+  XSelectInput(display,window,KeyPressMask | KeyReleaseMask);
+
+  GC context = DefaultGC(display,screen);
+          
+  XStoreName(display,window,"Licar");
+
+  /*
+    Hardcoded constants here may perhaps cause trouble on some platforms, but
+    doing X11 "the right way" would mean 1 billion lines of code, so fuck it.
+  */
+  XImage *image = XCreateImage(display,DefaultVisual(display,screen),
+    /*DefaultDepth(display,screen)*/24,ZPixmap,0,framebuffer,
+    LCR_SETTING_RESOLUTION_X,LCR_SETTING_RESOLUTION_Y,8,0);
+ 
+  while (running) // main loop
+  {
+    XEvent event;
+
+    gettimeofday(&now,NULL);
+    running &= LCR_gameStep(now.tv_sec * 1000 + now.tv_usec / 1000);
+
+    XPutImage(display,window,context,image,0,0,0,0,LCR_SETTING_RESOLUTION_X,
+      LCR_SETTING_RESOLUTION_Y);
+
+    while (XCheckWindowEvent(display,window,KeyPressMask |
+      KeyReleaseMask,&event) != False)
+    {
+      uint8_t state = event.xkey.type == KeyPress;
+
+      switch (XKeycodeToKeysym(display,event.xkey.keycode,0))
+      {
+        case XK_Up: case XK_w:
+          buttonStates[LCR_KEY_UP % 8] = state; break;
+
+        case XK_Left: case XK_a:
+          buttonStates[LCR_KEY_LEFT % 8] = state; break;
+          
+        case XK_Right: case XK_d:
+          buttonStates[LCR_KEY_RIGHT % 8] = state; break;
+
+        case XK_Down: case XK_s:
+          buttonStates[LCR_KEY_DOWN % 8] = state; break;
+
+        case XK_j: case XK_Return:
+          buttonStates[LCR_KEY_A % 8] = state; break;
+        
+        case XK_k: case XK_Escape:
+          buttonStates[LCR_KEY_B % 8] = state; break;
+
+        default: break;
+      }
+    }
+  }
+
+  XDestroyImage(image);
+  XCloseDisplay(display); 
+
+  if (dataFile)
+    fclose(dataFile);
+
+  LCR_gameEnd();
+
+  return 0;
+}