Change architecture

README.md

@@ -157,15 +157,15 @@ assets/          asset sources (textures, sprites, maps, sounds, ...)
   *.py           scripts for converting assets to C structs/arrays
 media/           media presenting the game (screenshots, logo, ...)
 constants.h      game constants that aren't considered settings
+game.h           main game logic
 images.h         images (textures, sprites) from assets folder converted to C
 levels.h         levels from assets folder converted to C
+main_*.*         fronted implement. for various platforms, passed to compiler
 palette.h        game 256 color palette
-platform_*.png   fronted implementation for various platforms
 raycastlib.h     raycasting library
 settings.h       game settings that users can change (FPS, resolution, ...)
 sounds.h         sounds from assets folder converted to C
 texts.h          game texts
-main.c           main game logic, this file is passed to the compiler
 make.sh          compiling script constaining compiler settings
 HTMLshell.html   HTML shell for emscripten (browser) version
 index.html       game website

TODO.txt

@@ -2,6 +2,7 @@ general:
 
 - Architecture change: make platform files compilable and move main.c to game.h
   (so that pokitto is .cpp, GB is .ino etc.).
+- Rewrite python scripts to C (faster, less bloat).
 - Try to recolor textures and give them a bit more of variety.
 - Make monsters die when squeezed?
 - On Win$hit builds display an anti-windshit text, by macro.
@@ -83,7 +84,7 @@ level ideas:
 - wall made of elevators (or squeezers), serving as a big auto-opening gate      DONE
 - a key spot to which the player can only get by jumping from a distant high
   elevated place
-- player has to jump from one elevator to another, which can only be done when
+- player has to jump from one elevator to another, which can only be done when   kinda
   they're both moving down
 - multiple doors in a row (can look interesting)                                 DONE
 - narrow (1 square wide) corridor filled with enemies blocking it
@@ -112,7 +113,7 @@ level ideas:
 - teleports placed so that the player can shoot himself with a rocket or plasma  DONE 
   (for fun)
 - exploders in a maze, hiding behind corners
-- teleport leading to a center of big room full of enemies
+- teleport leading to a center of big room full of enemies                       kinda
 - easter egg -- a level that looks funny on the map, e.g. forms a text or a      DONE
   picture
 - squeezers with low-elevated base (a hole), on a side of a corridor -- if the

levels.h

@@ -1051,7 +1051,7 @@ SFG_PROGRAM_MEMORY SFG_Level SFG_levels[SFG_NUMBER_OF_LEVELS] =
     }
   },
 
-  #include "/home/tastyfish/Git/sucklessFPS/assets/tmp.txt"
+  #include "/home/tastyfish/git/anarch/assets/tmp.txt"
   ,
 
   { // level 6

main_pokitto.cpp

@@ -0,0 +1,168 @@
+/**
+  @file main_pokitto.cpp
+
+  This is Pokitto implementation of the game front end, using the official
+  PokittoLib.
+
+  by Miloslav Ciz (drummyfish), 2019
+
+  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.
+*/
+
+//#define SFG_LOG(str) printf("game: %s\n",str); // for debug only
+
+#define SFG_FPS 30
+#define SFG_TEXTURE_DISTANCE 5000
+#define SFG_SCREEN_RESOLUTION_X 110
+#define SFG_SCREEN_RESOLUTION_Y 88
+#define SFG_RESOLUTION_SCALEDOWN 1
+#define SFG_DITHERED_SHADOW 0
+#define SFG_FOG_DIMINISH_STEP 2048
+#define SFG_RAYCASTING_MAX_STEPS 20  
+#define SFG_RAYCASTING_MAX_HITS 6
+#define SFG_RAYCASTING_SUBSAMPLE 2
+
+#include "Pokitto.h"
+#include "clock_11u6x.h"
+#include "timer_11u6x.h"
+#include "palette.h"
+
+#include "game.h"
+#include "sounds.h"
+
+Pokitto::Core pokitto;
+
+uint8_t *pokittoScreen;
+
+void SFG_setPixel(uint16_t x, uint16_t y, uint8_t colorIndex)
+{
+  pokittoScreen[y * SFG_SCREEN_RESOLUTION_X + x] = colorIndex;
+}
+
+uint32_t SFG_getTimeMs()
+{
+  return pokitto.getTime();
+}
+
+void SFG_sleepMs(uint16_t timeMs)
+{
+}
+
+int8_t SFG_keyPressed(uint8_t key)
+{
+  switch (key)
+  {
+    case SFG_KEY_UP: return pokitto.upBtn(); break;
+    case SFG_KEY_RIGHT: return pokitto.rightBtn(); break;
+    case SFG_KEY_DOWN: return pokitto.downBtn(); break;
+    case SFG_KEY_LEFT: return pokitto.leftBtn(); break;
+    case SFG_KEY_A: return pokitto.aBtn(); break;
+    case SFG_KEY_B: return pokitto.bBtn(); break;
+    case SFG_KEY_C: return pokitto.cBtn(); break;
+    default: return 0; break;
+  }
+}
+
+void SFG_getMouseOffset(int16_t *x, int16_t *y)
+{
+  *x = 0;
+  *y = 0;
+}
+
+uint8_t audioBuff[SFG_SFX_SAMPLE_COUNT];
+uint16_t audioPos = 0;
+
+uint8_t musicOn = 1;
+
+void SFG_enableMusic(uint8_t enable)
+{
+  musicOn = enable;
+}
+
+static inline uint8_t mixSamples(uint8_t sample1, uint8_t sample2)
+{
+  return (sample1 >> 1) + (sample2 >> 1);
+}
+
+void onTimer() // for sound
+{
+  if (Chip_TIMER_MatchPending(LPC_TIMER32_0, 1))
+  {
+    Chip_TIMER_ClearMatch(LPC_TIMER32_0, 1);
+
+    Pokitto::dac_write(
+      musicOn ?
+      mixSamples(audioBuff[audioPos],SFG_getNextMusicSample() / 2) :
+      audioBuff[audioPos]
+      );
+
+    audioBuff[audioPos] = 127;
+
+    audioPos = (audioPos + 1) % SFG_SFX_SAMPLE_COUNT;
+  }
+}
+
+void timerInit(uint32_t samplingRate)
+{
+  Chip_TIMER_Init(LPC_TIMER32_0);
+  Chip_TIMER_Reset(LPC_TIMER32_0);
+  Chip_TIMER_MatchEnableInt(LPC_TIMER32_0, 1);
+  Chip_TIMER_SetMatch(LPC_TIMER32_0, 1, 
+    (Chip_Clock_GetSystemClockRate() / samplingRate));
+  Chip_TIMER_ResetOnMatchEnable(LPC_TIMER32_0, 1);
+  Chip_TIMER_Enable(LPC_TIMER32_0);
+
+  #define weirdNumber ((IRQn_Type) 18)
+  NVIC_ClearPendingIRQ(weirdNumber);
+  NVIC_SetVector(weirdNumber, (uint32_t) &onTimer);
+  NVIC_EnableIRQ(weirdNumber);
+  #undef weirdNumber
+}
+
+void SFG_playSound(uint8_t soundIndex, uint8_t volume)
+{
+  uint8_t volumeStep = volume / 16;
+
+  uint16_t pos = audioPos;
+
+  for (int i = 0; i < SFG_SFX_SAMPLE_COUNT; ++i)
+  {
+    audioBuff[pos] =
+      mixSamples(audioBuff[pos],SFG_GET_SFX_SAMPLE(soundIndex,i) * volumeStep);
+
+    pos = (pos < SFG_SFX_SAMPLE_COUNT - 1) ? (pos + 1) : 0;
+  }
+}
+
+int main()
+{
+  pokitto.begin(); 
+  timerInit(8000);
+
+  for (uint16_t i = 0; i < SFG_SFX_SAMPLE_COUNT; ++i)
+    audioBuff[i] = 127;
+
+  pokitto.setFrameRate(255);
+  pokitto.display.setFont(fontTiny);
+  pokitto.display.persistence = 1;
+  pokitto.display.setInvisibleColor(-1);
+  pokitto.display.load565Palette(paletteRGB565);
+
+  pokittoScreen = pokitto.display.screenbuffer;
+
+  SFG_init();
+
+  while (pokitto.isRunning())
+  {
+    if (pokitto.update())
+    {
+      SFG_mainLoopBody();
+    }
+  }
+
+  return 0;
+}
+

main_sdl.c

@@ -0,0 +1,347 @@
+/**
+  @file main_sdl.c
+
+  This is an SDL2 implementation of the game front end. It can be used to
+  compile a native executable or a transpiled JS browser version with
+  emscripten.
+
+  To compile with emscripten run:
+
+  emcc ./main_sdl.c -s USE_SDL=2 -O3 --shell-file HTMLshell.html -o game.html
+
+  by Miloslav Ciz (drummyfish), 2019
+
+  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.
+*/
+
+#if defined(_WIN32) || defined(WIN32) || defined(__WIN32__) || defined(__NT__) || defined(__APPLE__)
+  #define SFG_OS_IS_MALWARE 1
+#endif
+
+#define SFG_BACKGROUND_BLUR 1
+
+#define SFG_LOG(str) puts(str);
+
+#include <stdio.h>
+#include <SDL2/SDL.h>
+
+#include "game.h"
+#include "sounds.h"
+
+const uint8_t *sdlKeyboardState;
+uint8_t sdlMouseButtonState = 0;
+int8_t sdlMouseWheelState = 0;
+
+uint16_t screen[SFG_SCREEN_RESOLUTION_X * SFG_SCREEN_RESOLUTION_Y]; // RGB565 format
+
+SDL_Window *window;
+SDL_Renderer *renderer;
+SDL_Texture *texture;
+SDL_Surface *screenSurface;
+
+void SFG_setPixel(uint16_t x, uint16_t y, uint8_t colorIndex)
+{
+  screen[y * SFG_SCREEN_RESOLUTION_X + x] = paletteRGB565[colorIndex];
+}
+
+uint32_t SFG_getTimeMs()
+{
+  return SDL_GetTicks();
+}
+
+void SFG_sleepMs(uint16_t timeMs)
+{
+#ifndef __EMSCRIPTEN__
+  usleep(timeMs * 1000);
+#endif
+}
+
+void SFG_getMouseOffset(int16_t *x, int16_t *y)
+{
+  int mX, mY;
+
+  SDL_GetMouseState(&mX,&mY);
+
+  *x = mX - SFG_SCREEN_RESOLUTION_X / 2;
+  *y = mY - SFG_SCREEN_RESOLUTION_Y / 2;
+
+  SDL_WarpMouseInWindow(window,
+    SFG_SCREEN_RESOLUTION_X / 2, SFG_SCREEN_RESOLUTION_Y / 2);
+}
+
+int8_t SFG_keyPressed(uint8_t key)
+{
+  switch (key)
+  {
+    case SFG_KEY_UP:
+      return sdlKeyboardState[SDL_SCANCODE_UP] ||
+             sdlKeyboardState[SDL_SCANCODE_W] ||
+             sdlKeyboardState[SDL_SCANCODE_KP_8];
+      break;
+
+    case SFG_KEY_RIGHT:
+      return sdlKeyboardState[SDL_SCANCODE_RIGHT] ||
+             sdlKeyboardState[SDL_SCANCODE_E] ||
+             sdlKeyboardState[SDL_SCANCODE_KP_6];
+      break;
+
+    case SFG_KEY_DOWN:
+      return sdlKeyboardState[SDL_SCANCODE_DOWN] ||
+             sdlKeyboardState[SDL_SCANCODE_S] ||
+             sdlKeyboardState[SDL_SCANCODE_KP_5] ||
+             sdlKeyboardState[SDL_SCANCODE_KP_2]; 
+      break;
+
+    case SFG_KEY_LEFT:
+      return sdlKeyboardState[SDL_SCANCODE_LEFT] ||
+             sdlKeyboardState[SDL_SCANCODE_Q] ||
+             sdlKeyboardState[SDL_SCANCODE_KP_4];
+      break;
+
+    case SFG_KEY_A:
+      return sdlKeyboardState[SDL_SCANCODE_G];
+      break;
+
+    case SFG_KEY_B:
+      return sdlKeyboardState[SDL_SCANCODE_H] || (sdlMouseButtonState & SDL_BUTTON_LMASK);
+      break;
+
+    case SFG_KEY_C:
+      return sdlKeyboardState[SDL_SCANCODE_J];
+      break;
+
+    case SFG_KEY_JUMP:
+      return sdlKeyboardState[SDL_SCANCODE_SPACE];
+      break;
+
+    case SFG_KEY_STRAFE_LEFT:
+      return sdlKeyboardState[SDL_SCANCODE_A] ||
+             sdlKeyboardState[SDL_SCANCODE_KP_7];
+      break;
+
+    case SFG_KEY_STRAFE_RIGHT:
+      return sdlKeyboardState[SDL_SCANCODE_D] ||
+             sdlKeyboardState[SDL_SCANCODE_KP_9];
+      break;
+
+    case SFG_KEY_MAP:
+      return sdlKeyboardState[SDL_SCANCODE_TAB];
+      break;
+
+    case SFG_KEY_TOGGLE_FREELOOK:
+      return sdlMouseButtonState & SDL_BUTTON_RMASK;
+      break;
+
+    case SFG_KEY_NEXT_WEAPON:
+      if (sdlMouseWheelState > 0)
+      {
+        sdlMouseWheelState--;
+        return 1;
+      }
+        
+      return 0;
+      break;
+
+    case SFG_KEY_PREVIOUS_WEAPON:
+      if (sdlMouseWheelState < 0)
+      {
+        sdlMouseWheelState++;
+        return 1;
+      }
+        
+      return 0;
+      break;
+
+    case SFG_KEY_MENU:
+      return sdlKeyboardState[SDL_SCANCODE_X];
+      break;
+
+    default: return 0; break;
+  }
+}
+  
+int running;
+
+void mainLoopIteration()
+{
+  SDL_Event event;
+
+  while (SDL_PollEvent(&event)) // also automatically updates sdlKeyboardState
+  {
+    if(event.type == SDL_MOUSEWHEEL)
+    {
+      if (event.wheel.y > 0) // scroll up
+        sdlMouseWheelState++;
+      else if (event.wheel.y < 0) // scroll down
+        sdlMouseWheelState--;
+    }
+  }
+
+  sdlMouseButtonState = SDL_GetMouseState(NULL,NULL);
+
+  if (sdlKeyboardState[SDL_SCANCODE_ESCAPE])
+    running = 0;
+
+  SFG_mainLoopBody();
+
+  SDL_UpdateTexture(texture,NULL,screen,SFG_SCREEN_RESOLUTION_X * sizeof(uint16_t));
+
+  SDL_RenderClear(renderer);
+  SDL_RenderCopy(renderer,texture,NULL,NULL);
+  SDL_RenderPresent(renderer);
+}   
+
+#ifdef __EMSCRIPTEN__
+typedef void (*em_callback_func)(void);
+void emscripten_set_main_loop(em_callback_func func, int fps, int simulate_infinite_loop);
+#endif
+
+uint8_t audioBuff[SFG_SFX_SAMPLE_COUNT];
+uint16_t audioPos = 0;
+
+static inline uint8_t mixSamples(uint8_t sample1, uint8_t sample2)
+{
+  return (sample1 >> 1) + (sample2 >> 1);
+}
+
+uint8_t musicOn = 1;
+
+void audioFillCallback(void *userdata, uint8_t *s, int l)
+{
+  for (int i = 0; i < l; ++i)
+  {
+    s[i] = musicOn ?
+      mixSamples(audioBuff[audioPos],SFG_getNextMusicSample() / 2) :
+      audioBuff[audioPos];
+
+    audioBuff[audioPos] = 127;
+    audioPos = (audioPos < SFG_SFX_SAMPLE_COUNT - 1) ? (audioPos + 1) : 0;
+  }
+}
+
+void SFG_enableMusic(uint8_t enable)
+{
+  musicOn = enable;
+}
+
+void SFG_playSound(uint8_t soundIndex, uint8_t volume)
+{
+  uint8_t volumeStep = volume / 16;
+
+  uint16_t pos = audioPos;
+
+  for (int i = 0; i < SFG_SFX_SAMPLE_COUNT; ++i)
+  {
+    audioBuff[pos] =
+      mixSamples(audioBuff[pos],SFG_GET_SFX_SAMPLE(soundIndex,i) * volumeStep);
+
+    pos = (pos < SFG_SFX_SAMPLE_COUNT - 1) ? (pos + 1) : 0;
+  }
+}
+
+int main(int argc, char *argv[])
+{
+  uint8_t argHelp = 0;
+  uint8_t argForceWindow = 0;
+  uint8_t argForceFullscreen = 0;
+
+  for (uint8_t i = 1; i < argc; ++i)
+  {
+    if (argv[i][0] == '-' && argv[i][1] == 'h' && argv[i][2] == 0)
+      argHelp = 1;
+    else if (argv[i][0] == '-' && argv[i][1] == 'w' && argv[i][2] == 0)       
+      argForceWindow = 1;
+    else if (argv[i][0] == '-' && argv[i][1] == 'f' && argv[i][2] == 0)       
+      argForceFullscreen = 1;
+    else
+      puts("SDL: unknown argument"); 
+  }
+
+  if (argHelp)
+  {
+    puts("TODOGAME, a suckless first person shooter game (SDL2 frontend)\n");
+    puts("version TODO, by Miloslav Ciz, released under CC0 1.0 + waiver of all IP");
+    puts("possible arguments:\n");
+    puts("-h       print this help and end");
+    puts("-w       force run in window");
+    puts("-f       force run fullscreen\n");
+    puts("controls:");
+    puts("TODO");
+
+    return 0;
+  }
+
+  puts("SDL: starting");
+
+  puts("SDL: initializing SDL");
+
+  window =
+    SDL_CreateWindow("raycasting", SDL_WINDOWPOS_UNDEFINED,
+    SDL_WINDOWPOS_UNDEFINED, SFG_SCREEN_RESOLUTION_X, SFG_SCREEN_RESOLUTION_Y,
+    SDL_WINDOW_SHOWN); 
+
+  renderer = SDL_CreateRenderer(window,-1,0);
+
+  texture =
+    SDL_CreateTexture(renderer,SDL_PIXELFORMAT_RGB565,SDL_TEXTUREACCESS_STATIC,
+    SFG_SCREEN_RESOLUTION_X,SFG_SCREEN_RESOLUTION_Y);
+
+  screenSurface = SDL_GetWindowSurface(window);
+
+#if SFG_FULLSCREEN
+  argForceFullscreen = 1;
+#endif
+
+  if (!argForceWindow && argForceFullscreen)
+  {
+    puts("SDL: setting fullscreen");
+    SDL_SetWindowFullscreen(window,SDL_WINDOW_FULLSCREEN_DESKTOP);
+  }
+
+  sdlKeyboardState = SDL_GetKeyboardState(NULL);
+
+  SDL_ShowCursor(0);
+
+  SFG_init(SDL_INIT_AUDIO);
+
+  SDL_AudioSpec audioSpec;
+
+  audioSpec.callback = audioFillCallback;
+  audioSpec.userdata = 0;
+  audioSpec.freq = 8000;
+  audioSpec.format = AUDIO_U8;
+  audioSpec.channels = 1;
+  audioSpec.samples = 128;
+
+  if (SDL_OpenAudio(&audioSpec,0) < 0)
+    puts("SDL: could not initialize audio");
+
+  for (int i = 0; i < SFG_SFX_SAMPLE_COUNT; ++i)
+    audioBuff[i] = 127;
+
+  SDL_PauseAudio(0);
+
+  running = 1;
+
+#ifdef __EMSCRIPTEN__
+  emscripten_set_main_loop(mainLoopIteration,0,1);
+#else
+  while (running)
+    mainLoopIteration();
+#endif
+
+  puts("SDL: freeing SDL");
+
+  SDL_PauseAudio(1);
+  SDL_DestroyTexture(texture);
+  SDL_DestroyRenderer(renderer); 
+  SDL_DestroyWindow(window); 
+  SDL_CloseAudio();
+
+  puts("SDL: ending");
+
+  return 0;
+}

settings.h

@@ -32,30 +32,35 @@
   On platforms with mouse this sets its horizontal sensitivity. 128 means 1
   RCL_Unit per mouse pixel travelled.
 */
-#define SFG_MOUSE_SENSITIVITY_HORIZONTAL 32
+#ifndef SFG_MOUSE_SENSITIVITY_HORIZONTAL
+  #define SFG_MOUSE_SENSITIVITY_HORIZONTAL 32
+#endif
 
 /**
   Like SFG_MOUSE_SENSITIVITY_HORIZONTAL but for vertical look. 128 means 1
   shear pixel per mouse pixel travelled.
 */
-#define SFG_MOUSE_SENSITIVITY_VERTICAL 64
+#ifndef SFG_MOUSE_SENSITIVITY_VERTICAL
+  #define SFG_MOUSE_SENSITIVITY_VERTICAL 64
+#endif
 
 /**
   Width of the screen in pixels. Set this to ACTUAL resolution. If you want the
   game to run at smaller resolution (with bigger pixels), do his using
   SFG_RESOLUTION_SCALEDOWN;  
 */
-#define SFG_SCREEN_RESOLUTION_X 1024
+#ifndef SFG_SCREEN_RESOLUTION_X
+  #define SFG_SCREEN_RESOLUTION_X 800
+#endif
 
 /**
   Height of the screen in pixels. Set this to ACTUAL resolution. If you want the
   game to run at smaller resolution (with bigger pixels), do his using
   SFG_RESOLUTION_SCALEDOWN;  
 */
-#define SFG_SCREEN_RESOLUTION_Y 768
-
-
-#define SFG_Z_BUFFER_BAND 
+#ifndef SFG_SCREEN_RESOLUTION_Y
+  #define SFG_SCREEN_RESOLUTION_Y 600
+#endif
 
 /**
   Distance, in RCL_Units, to which textures will be drawn. Textures behind this
@@ -64,162 +69,224 @@
   having just a low value, values >= 65535 activate texturing completely, which
   can be a little faster than setting having a high value lower than this limit.
 */
-#define SFG_TEXTURE_DISTANCE 100000
+#ifndef SFG_TEXTURE_DISTANCE
+  #define SFG_TEXTURE_DISTANCE 100000
+#endif
 
 /**
   How many times the screen resolution will be divided (how many times a game
   pixel will be bigger than the screen pixel).
 */
-#define SFG_RESOLUTION_SCALEDOWN 1
+#ifndef SFG_RESOLUTION_SCALEDOWN
+  #define SFG_RESOLUTION_SCALEDOWN 1
+#endif
 
 /**
   Hint as to whether run in fullscreen, if the platform allows it.
 */
-#define SFG_FULLSCREEN 0
+#ifndef SFG_FULLSCREEN
+  #define SFG_FULLSCREEN 0
+#endif
 
 /**
   Whether shadows (fog) should be dithered, i.e. more smooth (needs a bit more
   CPU performance and memory).
 */
-#define SFG_DITHERED_SHADOW 1
+#ifndef SFG_DITHERED_SHADOW
+  #define SFG_DITHERED_SHADOW 1
+#endif
 
 /**
   Depth step (in RCL_Units) after which fog diminishes a color by one value
   point. For performance reasons this number should be kept a power of two!
 */
-#define SFG_FOG_DIMINISH_STEP 2048
+#ifndef SFG_FOG_DIMINISH_STEP
+  #define SFG_FOG_DIMINISH_STEP 2048
+#endif
 
 /**
   Maximum number of squares that will be traversed by any cast ray. Smaller
   number is faster but can cause visual artifacts.
 */
-#define SFG_RAYCASTING_MAX_STEPS 30
+#ifndef SFG_RAYCASTING_MAX_STEPS
+  #define SFG_RAYCASTING_MAX_STEPS 30
+#endif
 
 /**
   Maximum number of hits any cast ray will register. Smaller number is faster
   but can cause visual artifacts.
 */
-#define SFG_RAYCASTING_MAX_HITS 10
+#ifndef SFG_RAYCASTING_MAX_HITS
+  #define SFG_RAYCASTING_MAX_HITS 10
+#endif
 
 /**
   How many times rendering should be subsampled horizontally. Bigger number
   can significantly improve performance (by casting fewer rays), but can look
   a little worse.
 */
-#define SFG_RAYCASTING_SUBSAMPLE 1
+#ifndef SFG_RAYCASTING_SUBSAMPLE
+  #define SFG_RAYCASTING_SUBSAMPLE 1
+#endif
 
 /**
   Enables or disables fog (darkness) due to distance. Recommended to keep on
   for good look, but can be turned off for performance.
 */
-#define SFG_ENABLE_FOG 1
+#ifndef SFG_ENABLE_FOG
+  #define SFG_ENABLE_FOG 1
+#endif
 
 /**
   Says whether sprites should diminish in fog. This takes more performance but
   looks better.
 */
-#define SFG_DIMINISH_SPRITES 1
+#ifndef SFG_DIMINISH_SPRITES
+  #define SFG_DIMINISH_SPRITES 1
+#endif
 
 /**
   How quick player head bob is, 1024 meaning once per second. 0 Means turn off
   head bob.
 */
-#define SFG_HEADBOB_SPEED 900
+#ifndef SFG_HEADBOB_SPEED
+  #define SFG_HEADBOB_SPEED 900
+#endif
 
 /**
   Sets head bob offset, in RCL_UNITS_PER_SQUARE. 0 Means turn off head bob.
 */
-#define SFG_HEADBOB_OFFSET 200
+#ifndef SFG_HEADBOB_OFFSET
+  #define SFG_HEADBOB_OFFSET 200
+#endif
 
 /**
   Weapon bobbing offset in weapon image pixels.
 */
-#define SFG_WEAPONBOB_OFFSET 4 
+#ifndef SFG_WEAPONBOB_OFFSET
+  #define SFG_WEAPONBOB_OFFSET 4 
+#endif
 
 /**
   Camera shearing (looking up/down) speed, in vertical resolutions per second.
 */
-#define SFG_CAMERA_SHEAR_SPEED 3
+#ifndef SFG_CAMERA_SHEAR_SPEED
+  #define SFG_CAMERA_SHEAR_SPEED 3
+#endif
 
 /**
   Maximum camera shear (vertical angle). 1024 means 1.0 * vertical resolution.
 */
-#define SFG_CAMERA_MAX_SHEAR 1024
+#ifndef SFG_CAMERA_MAX_SHEAR
+  #define SFG_CAMERA_MAX_SHEAR 1024
+#endif
 
 /**
   Specifies how quick some sprite animations are, in frames per second.
 */
-#define SFG_SPRITE_ANIMATION_SPEED 4
+#ifndef SFG_SPRITE_ANIMATION_SPEED
+  #define SFG_SPRITE_ANIMATION_SPEED 4
+#endif
 
 /**
   How wide the border indicator is, in fractions of screen width.
 */
-#define SFG_HUD_BORDER_INDICATOR_WIDTH 32
+#ifndef SFG_HUD_BORDER_INDICATOR_WIDTH
+  #define SFG_HUD_BORDER_INDICATOR_WIDTH 32
+#endif
 
 /**
   For how long border indication (being hurt etc.) stays shown, in ms.
 */
-#define SFG_HUD_BORDER_INDICATOR_DURATION 500
+#ifndef SFG_HUD_BORDER_INDICATOR_DURATION
+  #define SFG_HUD_BORDER_INDICATOR_DURATION 500
+#endif
 
 /**
   Color (palette index) by which being hurt is indicated.
 */
-#define SFG_HUD_HURT_INDICATION_COLOR 175
+#ifndef SFG_HUD_HURT_INDICATION_COLOR
+  #define SFG_HUD_HURT_INDICATION_COLOR 175
+#endif
 
 /**
   Color (palette index) by which taking an item is indicated.
 */
-#define SFG_HUD_ITEM_TAKEN_INDICATION_COLOR 207
+#ifndef SFG_HUD_ITEM_TAKEN_INDICATION_COLOR
+  #define SFG_HUD_ITEM_TAKEN_INDICATION_COLOR 207
+#endif
 
 /**
   How many element (items, monsters, ...) distances will be checked per frame
   for distance. Higher value may decrease performance a tiny bit, but things
   will react more quickly and appear less "out of thin air".
 */
-#define SFG_ELEMENT_DISTANCES_CHECKED_PER_FRAME 8
+#ifndef SFG_ELEMENT_DISTANCES_CHECKED_PER_FRAME
+  #define SFG_ELEMENT_DISTANCES_CHECKED_PER_FRAME 8
+#endif
 
 /**
   Maximum distance at which sound effects (SFX) will be played. The SFX volume
   will gradually drop towards this distance.
 */
-#define SFG_SFX_MAX_DISTANCE (1024 * 20)
+#ifndef SFG_SFX_MAX_DISTANCE
+  #define SFG_SFX_MAX_DISTANCE (1024 * 20)
+#endif
 
 /**
   Says the intensity of background image blur. 0 means no blur, improves
   performance and lowers memory usage.
 */
-#define SFG_BACKGROUND_BLUR 0
+#ifndef SFG_BACKGROUND_BLUR
+  #define SFG_BACKGROUND_BLUR 0
+#endif
 
 /**
   Defines the period, in ms, of things that blink, such as text.
 */
-#define SFG_BLINK_PERIOD 500
+#ifndef SFG_BLINK_PERIOD
+  #define SFG_BLINK_PERIOD 500
+#endif
 
 /**
   Probability (0 - 255) of how often a monster makes sound during movement.
 */
-#define SFG_MONSTER_SOUND_PROBABILITY 64
+#ifndef SFG_MONSTER_SOUND_PROBABILITY
+  #define SFG_MONSTER_SOUND_PROBABILITY 64
+#endif
 
 /**
   Affects how precise monsters are in aiming, specify random range in
   fourths of a game square. Should be power of 2 for performance.
 */
-#define SFG_MONSTER_AIM_RANDOMNESS 4
+#ifndef SFG_MONSTER_AIM_RANDOMNESS
+  #define SFG_MONSTER_AIM_RANDOMNESS 4
+#endif
 
 /// Color 1 index of player on map.
-#define SFG_MAP_PLAYER_COLOR1 93
+#ifndef SFG_MAP_PLAYER_COLOR1
+  #define SFG_MAP_PLAYER_COLOR1 93
+#endif
 
 /// Color 2 index of player on map.
-#define SFG_MAP_PLAYER_COLOR2 111
+#ifndef SFG_MAP_PLAYER_COLOR2
+  #define SFG_MAP_PLAYER_COLOR2 111
+#endif
 
 /// Color index of elevators on map.
-#define SFG_MAP_ELEVATOR_COLOR 214
+#ifndef SFG_MAP_ELEVATOR_COLOR
+  #define SFG_MAP_ELEVATOR_COLOR 214
+#endif
 
 /// Color index of squeezers on map.
-#define SFG_MAP_SQUEEZER_COLOR 246
+#ifndef SFG_MAP_SQUEEZER_COLOR
+  #define SFG_MAP_SQUEEZER_COLOR 246
+#endif
 
 /// Color index of door on map.
-#define SFG_MAP_DOOR_COLOR 188
+#ifndef SFG_MAP_DOOR_COLOR
+  #define SFG_MAP_DOOR_COLOR 188
+#endif
 
 /**
   Boolean value indicating whether current OS is malware.
@@ -233,44 +300,60 @@
 /**
   Developer cheat for having infinite ammo in all weapons.
 */
-#define SFG_INFINITE_AMMO 1
+#ifndef SFG_INFINITE_AMMO
+  #define SFG_INFINITE_AMMO 1
+#endif
 
 /**
   Developer cheat for immortality.
 */
-#define SFG_IMMORTAL 1
+#ifndef SFG_IMMORTAL
+  #define SFG_IMMORTAL 1
+#endif
 
 /**
   Turn on for previes mode for map editing (flying, noclip, fast movement etc.).
 */
-#define SFG_PREVIEW_MODE 0
+#ifndef SFG_PREVIEW_MODE
+  #define SFG_PREVIEW_MODE 0
+#endif
 
 /**
   How much faster movement is in the preview mode.
 */
-#define SFG_PREVIEW_MODE_SPEED_MULTIPLIER 2
+#ifndef SFG_PREVIEW_MODE_SPEED_MULTIPLIER
+  #define SFG_PREVIEW_MODE_SPEED_MULTIPLIER 2
+#endif
 
 /**
   Skips menu and starts given level immediatelly, for development. 0 means this
   options is ignored, 1 means load level 1 etc.
 */
-#define SFG_START_LEVEL 6
+#ifndef SFG_START_LEVEL
+  #define SFG_START_LEVEL 6
+#endif
 
 /**
   Reveals whole level map from start.
 */
-#define SFG_REVEAL_MAP 1
+#ifndef SFG_REVEAL_MAP
+  #define SFG_REVEAL_MAP 1
+#endif
 
 /**
   Gives player all keys from start.
 */
-#define SFG_UNLOCK_DOOR 0
+#ifndef SFG_UNLOCK_DOOR
+  #define SFG_UNLOCK_DOOR 0
+#endif
 
 /**
   Whether levels background (in distance or transparent wall textures) should
   be drawn. If turned off, the background will be constant color, which can 
   noticably increase performance.
 */
-#define SFG_DRAW_LEVEL_BACKGROUND 1
+#ifndef SFG_DRAW_LEVEL_BACKGROUND
+  #define SFG_DRAW_LEVEL_BACKGROUND 1
+#endif
 
 #endif // guard