Start sfml FE

main_csfml.c

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+/**
+  @file main_csfml.c
+
+  This is an csfml (C binding for SFML) implementation of the game front end.
+  This is another alternative to the SDL for the PC. This front end is more
+  minimal and simple than the SDL, so it's better as a learning resource.
+
+  by Miloslav Ciz (drummyfish), 2020
+
+  Released under CC0 1.0 (https://creativecommons.org/publicdomain/zero/1.0/)
+  plus a waiver of all other intellectual property. The goal of this work is
+  be and remain completely in the public domain forever, available for any use
+  whatsoever.
+*/
+
+#include <SFML/Audio.h>
+#include <SFML/Graphics.h>
+#include <SFML/System.h>
+#include <stdint.h>
+#include <stdio.h>
+
+#define SFG_SCREEN_RESOLUTION_X 640
+#define SFG_SCREEN_RESOLUTION_Y 480
+
+#define SFG_DITHERED_SHADOW 1
+#define SFG_DIMINISH_SPRITES 1
+#define SFG_RESOLUTION_SCALEDOWN 1
+
+#define WINDOW_SIZE (SFG_SCREEN_RESOLUTION_X * SFG_SCREEN_RESOLUTION_Y)
+
+#include "game.h"
+
+uint32_t windowPixels[WINDOW_SIZE];
+
+uint32_t paletteRGB32[256]; // SFML can't do 565, so precompute RGB here
+
+sfClock *clock;
+sfRenderWindow* window;
+
+int8_t SFG_keyPressed(uint8_t key)
+{
+  #define k(x) sfKeyboard_isKeyPressed(x)
+
+  switch (key)
+  {
+    case SFG_KEY_UP:
+      return k(sfKeyW) || k(sfKeyUp) || k(sfKeyNum8);
+      break;
+
+    case SFG_KEY_RIGHT:
+      return k(sfKeyE) || k(sfKeyRight) || k(sfKeyNum6);
+      break;
+
+    case SFG_KEY_DOWN:
+      return k(sfKeyS) || k(sfKeyDown) || k(sfKeyNum5) || k (sfKeyNum2);
+      break;
+
+    case SFG_KEY_LEFT:
+      return k(sfKeyQ) || k(sfKeyLeft) || k(sfKeyNum4);
+      break;
+
+    case SFG_KEY_A:
+      return k(sfKeyG) || k(sfKeyReturn) || k(sfKeyLShift);
+      break;
+
+    case SFG_KEY_B:
+      return k(sfKeyH) || k(sfKeyLControl) || k(sfKeyRControl)
+             || sfMouse_isButtonPressed(sfMouseLeft);
+      break;
+
+    case SFG_KEY_C:
+      return k(sfKeyJ);
+      break;
+
+    case SFG_KEY_JUMP:
+      return k(sfKeySpace);
+      break;
+
+    case SFG_KEY_STRAFE_LEFT:
+      return k(sfKeyA) || k(sfKeyNum7);
+      break;
+
+    case SFG_KEY_STRAFE_RIGHT:
+      return k(sfKeyD) || k(sfKeyNum9);
+      break;
+
+    case SFG_KEY_MAP:
+      return k(sfKeyTab);
+      break;
+
+    case SFG_KEY_TOGGLE_FREELOOK:
+      return sfMouse_isButtonPressed(sfMouseRight);
+      break;
+
+    case SFG_KEY_NEXT_WEAPON:
+/* TODO
+      if (sdlKeyboardState[SDL_SCANCODE_P] || sdlKeyboardState[SDL_SCANCODE_X])
+        return 1;
+
+      if (sdlMouseWheelState > 0)
+      {
+        sdlMouseWheelState--;
+        return 1;
+      }
+      */  
+      return 0;
+      break;
+
+    case SFG_KEY_PREVIOUS_WEAPON:
+/* TODO
+      if (sdlKeyboardState[SDL_SCANCODE_O] || sdlKeyboardState[SDL_SCANCODE_Y]
+          || sdlKeyboardState[SDL_SCANCODE_Z])
+        return 1;
+
+      if (sdlMouseWheelState < 0)
+      {
+        sdlMouseWheelState++;
+        return 1;
+      }
+        
+      return 0;
+*/
+      break;
+
+    case SFG_KEY_MENU:
+      return sfKeyboard_isKeyPressed(sfKeyEscape);
+      break;
+
+    default: return 0; break;
+
+    #undef k
+  }
+}
+
+void SFG_getMouseOffset(int16_t *x, int16_t *y)
+{
+  sfVector2u s = sfWindow_getSize(window);
+  sfVector2i p = sfMouse_getPosition(window);
+
+  s.x /= 2;
+  s.y /= 2;
+
+  *x = p.x - s.x;
+  *y = p.y - s.y;
+
+  p.x = s.x;
+  p.y = s.y;
+
+  sfMouse_setPosition(p,window);
+}
+
+uint32_t SFG_getTimeMs()
+{
+  return sfClock_getElapsedTime(clock).microseconds / 1000 ;
+}
+
+void SFG_sleepMs(uint16_t timeMs)
+{
+  sfTime t;
+  t.microseconds = timeMs * 1000;
+  sfSleep(t);
+}
+
+void SFG_setPixel(uint16_t x, uint16_t y, uint8_t colorIndex)
+{
+  windowPixels[y * SFG_SCREEN_RESOLUTION_X + x] = paletteRGB32[colorIndex];
+}
+
+void SFG_playSound(uint8_t soundIndex, uint8_t volume)
+{
+}
+
+void SFG_enableMusic(uint8_t enable)
+{
+}
+
+void SFG_processEvent(uint8_t event, uint8_t data)
+{
+}
+
+void SFG_save(uint8_t data[SFG_SAVE_SIZE])
+{
+}
+
+uint8_t SFG_load(uint8_t data[SFG_SAVE_SIZE])
+{
+  return 0;
+}
+
+int main()
+{
+  sfVideoMode mode = {SFG_SCREEN_RESOLUTION_X, SFG_SCREEN_RESOLUTION_Y, 32};
+  sfEvent event;
+  clock = sfClock_create();
+  sfClock_restart(clock);
+
+  SFG_init();
+
+  for (int i = 0; i < 256; ++i) // precompute RGB palette
+  {
+    uint16_t col565 = paletteRGB565[i];
+
+    paletteRGB32[i] = 0xff000000 | ((col565 << 19) & 0xf80000) |
+      ((col565 << 5) & 0xfc00) | ((col565 >> 8) & 0xf8);
+  }
+
+  sfTexture* windowTexture = sfTexture_create(SFG_SCREEN_RESOLUTION_X,SFG_SCREEN_RESOLUTION_Y);
+  sfTexture_setSmooth(windowTexture,sfTrue);
+
+  sfSprite* windowSprite = sfSprite_create();
+
+  window = sfRenderWindow_create(mode, "Anarch", sfResize | sfClose, NULL);
+  sfSprite_setTexture(windowSprite, windowTexture, sfTrue);
+
+  sfWindow_setMouseCursorVisible(window,sfFalse);
+  sfWindow_setVerticalSyncEnabled(window,sfFalse);
+
+  while (sfRenderWindow_isOpen(window))
+  {
+    while (sfRenderWindow_pollEvent(window,&event))
+      if (event.type == sfEvtClosed)
+        sfRenderWindow_close(window);
+
+    if (!SFG_mainLoopBody())
+      break;
+
+    sfTexture_updateFromPixels(windowTexture,windowPixels,SFG_SCREEN_RESOLUTION_X,SFG_SCREEN_RESOLUTION_Y,0,0);
+    sfRenderWindow_clear(window, sfBlack);
+    sfRenderWindow_drawSprite(window, windowSprite, NULL);
+    sfRenderWindow_display(window);
+  }
+
+  sfSprite_destroy(windowSprite);
+  sfTexture_destroy(windowTexture);
+  sfRenderWindow_destroy(window);
+  sfClock_destroy(clock);
+
+  return 0;
+}