mirror of https://gitlab.com/drummyfish/anarch.git
532 lines
13 KiB
C
532 lines
13 KiB
C
/**
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@file main_sdl.c
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This is an SDL2 implementation of the game front end. It can be used to
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compile a native executable or a transpiled JS browser version with
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emscripten.
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This frontend is not strictly minimal, it could be reduced a lot. If you want
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a learning example of frontend, look at another, simpler one, e.g. terminal.
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To compile with emscripten run:
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emcc ./main_sdl.c -s USE_SDL=2 -O3 --shell-file HTMLshell.html -o game.html
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by Miloslav Ciz (drummyfish), 2019
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Released under CC0 1.0 (https://creativecommons.org/publicdomain/zero/1.0/)
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plus a waiver of all other intellectual property. The goal of this work is to
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be and remain completely in the public domain forever, available for any use
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whatsoever.
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*/
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#if defined(_WIN32) || defined(WIN32) || defined(__WIN32__) || defined(__NT__) || defined(__APPLE__)
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#define SFG_OS_IS_MALWARE 1
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#endif
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// #define SFG_START_LEVEL 1
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// #define SFG_QUICK_WIN 1
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// #define SFG_IMMORTAL 1
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// #define SFG_ALL_LEVELS 1
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// #define SFG_UNLOCK_DOOR 1
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// #define SFG_REVEAL_MAP 1
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// #define SFG_INFINITE_AMMO 1
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// #define SFG_TIME_MULTIPLIER 512
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// #define SFG_CPU_LOAD(percent) printf("CPU load: %d%\n",percent);
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// #define GAME_LQ
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#ifndef __EMSCRIPTEN__
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#ifndef GAME_LQ
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// higher quality
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#define SFG_FPS 60
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#define SFG_LOG(str) puts(str);
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#define SFG_SCREEN_RESOLUTION_X 700
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#define SFG_SCREEN_RESOLUTION_Y 512
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#define SFG_DITHERED_SHADOW 1
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#define SFG_DIMINISH_SPRITES 1
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#define SFG_HEADBOB_SHEAR (-1 * SFG_SCREEN_RESOLUTION_Y / 80)
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#define SFG_BACKGROUND_BLUR 1
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#else
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// lower quality
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#define SFG_FPS 35
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#define SFG_SCREEN_RESOLUTION_X 640
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#define SFG_SCREEN_RESOLUTION_Y 480
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#define SFG_RAYCASTING_SUBSAMPLE 2
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#define SFG_RESOLUTION_SCALEDOWN 2
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#define SFG_LOG(str) puts(str);
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#define SFG_DIMINISH_SPRITES 0
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#define SFG_DITHERED_SHADOW 0
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#define SFG_BACKGROUND_BLUR 0
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#define SFG_RAYCASTING_MAX_STEPS 18
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#define SFG_RAYCASTING_MAX_HITS 8
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#endif
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#else
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// emscripten
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#define SFG_FPS 35
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#define SFG_SCREEN_RESOLUTION_X 512
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#define SFG_SCREEN_RESOLUTION_Y 320
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#define SFG_CAN_EXIT 0
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#define SFG_RESOLUTION_SCALEDOWN 2
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#define SFG_DITHERED_SHADOW 1
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#define SFG_BACKGROUND_BLUR 0
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#define SFG_RAYCASTING_MAX_STEPS 18
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#define SFG_RAYCASTING_MAX_HITS 8
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#include <emscripten.h>
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#endif
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/*
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SDL is easier to play thanks to nice controls so make the player take full
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damage to make it a bit harder.
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*/
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#define SFG_PLAYER_DAMAGE_MULTIPLIER 1024
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#define SDL_MUSIC_VOLUME 16
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#define SDL_ANALOG_DIVIDER 1024
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#if !SFG_OS_IS_MALWARE
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#include <signal.h>
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#endif
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#define SDL_MAIN_HANDLED 1
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#define SDL_DISABLE_IMMINTRIN_H 1
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#include <stdio.h>
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#include <unistd.h>
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#include <SDL2/SDL.h>
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#include "game.h"
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#include "sounds.h"
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const uint8_t *sdlKeyboardState;
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uint8_t webKeyboardState[SFG_KEY_COUNT];
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uint8_t sdlMouseButtonState = 0;
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int8_t sdlMouseWheelState = 0;
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SDL_GameController *sdlController;
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uint16_t sdlScreen[SFG_SCREEN_RESOLUTION_X * SFG_SCREEN_RESOLUTION_Y]; // RGB565
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SDL_Window *window;
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SDL_Renderer *renderer;
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SDL_Texture *texture;
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SDL_Surface *screenSurface;
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// now implement the Anarch API functions (SFG_*)
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void SFG_setPixel(uint16_t x, uint16_t y, uint8_t colorIndex)
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{
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sdlScreen[y * SFG_SCREEN_RESOLUTION_X + x] = paletteRGB565[colorIndex];
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}
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uint32_t SFG_getTimeMs()
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{
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return SDL_GetTicks();
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}
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void SFG_save(uint8_t data[SFG_SAVE_SIZE])
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{
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FILE *f = fopen("anarch.sav","wb");
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puts("SDL: opening and writing save file");
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if (f == NULL)
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{
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puts("SDL: could not open the file!");
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return;
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}
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fwrite(data,1,SFG_SAVE_SIZE,f);
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fclose(f);
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}
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uint8_t SFG_load(uint8_t data[SFG_SAVE_SIZE])
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{
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#ifndef __EMSCRIPTEN__
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FILE *f = fopen("anarch.sav","rb");
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puts("SDL: opening and reading save file");
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if (f == NULL)
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{
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puts("SDL: no save file to open");
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}
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else
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{
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fread(data,1,SFG_SAVE_SIZE,f);
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fclose(f);
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}
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return 1;
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#else
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// no saving for web version
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return 0;
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#endif
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}
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void SFG_sleepMs(uint16_t timeMs)
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{
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#ifndef __EMSCRIPTEN__
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usleep(timeMs * 1000);
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#endif
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}
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#ifdef __EMSCRIPTEN__
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void webButton(uint8_t key, uint8_t down) // HTML button pressed
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{
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webKeyboardState[key] = down;
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}
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#endif
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int8_t mouseMoved = 0; /* Whether the mouse has moved since program started,
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this is needed to fix an SDL limitation. */
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void SFG_getMouseOffset(int16_t *x, int16_t *y)
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{
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#ifndef __EMSCRIPTEN__
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if (mouseMoved)
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{
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int mX, mY;
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SDL_GetMouseState(&mX,&mY);
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*x = mX - SFG_SCREEN_RESOLUTION_X / 2;
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*y = mY - SFG_SCREEN_RESOLUTION_Y / 2;
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SDL_WarpMouseInWindow(window,
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SFG_SCREEN_RESOLUTION_X / 2, SFG_SCREEN_RESOLUTION_Y / 2);
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}
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if (sdlController != NULL)
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{
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*x +=
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(SDL_GameControllerGetAxis(sdlController,SDL_CONTROLLER_AXIS_RIGHTX) +
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SDL_GameControllerGetAxis(sdlController,SDL_CONTROLLER_AXIS_LEFTX)) /
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SDL_ANALOG_DIVIDER;
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*y +=
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(SDL_GameControllerGetAxis(sdlController,SDL_CONTROLLER_AXIS_RIGHTY) +
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SDL_GameControllerGetAxis(sdlController,SDL_CONTROLLER_AXIS_LEFTY)) /
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SDL_ANALOG_DIVIDER;
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}
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#endif
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}
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void SFG_processEvent(uint8_t event, uint8_t data)
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{
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}
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int8_t SFG_keyPressed(uint8_t key)
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{
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if (webKeyboardState[key]) // this only takes effect in the web version
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return 1;
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#define k(x) sdlKeyboardState[SDL_SCANCODE_ ## x]
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#define b(x) ((sdlController != NULL) && \
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SDL_GameControllerGetButton(sdlController,SDL_CONTROLLER_BUTTON_ ## x))
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switch (key)
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{
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case SFG_KEY_UP: return k(UP) || k(W) || k(KP_8) || b(DPAD_UP); break;
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case SFG_KEY_RIGHT:
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return k(RIGHT) || k(E) || k(KP_6) || b(DPAD_RIGHT); break;
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case SFG_KEY_DOWN:
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return k(DOWN) || k(S) || k(KP_5) || k(KP_2) || b(DPAD_DOWN); break;
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case SFG_KEY_LEFT: return k(LEFT) || k(Q) || k(KP_4) || b(DPAD_LEFT); break;
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case SFG_KEY_A: return k(J) || k(RETURN) || k(LCTRL) || k(RCTRL) || b(X) ||
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b(RIGHTSTICK) || (sdlMouseButtonState & SDL_BUTTON_LMASK); break;
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case SFG_KEY_B: return k(K) || k(LSHIFT) || b(B); break;
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case SFG_KEY_C: return k(L) || b(Y); break;
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case SFG_KEY_JUMP: return k(SPACE) || b(A); break;
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case SFG_KEY_STRAFE_LEFT: return k(A) || k(KP_7); break;
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case SFG_KEY_STRAFE_RIGHT: return k(D) || k(KP_9); break;
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case SFG_KEY_MAP: return k(TAB) || b(BACK); break;
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case SFG_KEY_CYCLE_WEAPON: return k(F) ||
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(sdlMouseButtonState & SDL_BUTTON_MMASK); break;
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case SFG_KEY_TOGGLE_FREELOOK: return b(LEFTSTICK) ||
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(sdlMouseButtonState & SDL_BUTTON_RMASK); break;
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case SFG_KEY_MENU: return k(ESCAPE) || b(START); break;
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case SFG_KEY_NEXT_WEAPON:
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if (k(P) || k(X) || b(RIGHTSHOULDER))
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return 1;
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#define checkMouse(cmp)\
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if (sdlMouseWheelState cmp 0) { sdlMouseWheelState = 0; return 1; }
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checkMouse(>)
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return 0;
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break;
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case SFG_KEY_PREVIOUS_WEAPON:
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if (k(O) || k(Y) || k(Z) || b(LEFTSHOULDER))
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return 1;
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checkMouse(<)
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#undef checkMouse
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return 0;
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break;
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default: return 0; break;
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}
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#undef k
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#undef b
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}
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int running;
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void mainLoopIteration()
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{
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SDL_Event event;
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#ifdef __EMSCRIPTEN__
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// hack, without it sound won't work because of shitty browser audio policies
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if (SFG_game.frame % 512 == 0)
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SDL_PauseAudio(0);
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#endif
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while (SDL_PollEvent(&event)) // also automatically updates sdlKeyboardState
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{
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if (event.type == SDL_MOUSEWHEEL)
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{
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if (event.wheel.y > 0) // scroll up
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sdlMouseWheelState = 1;
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else if (event.wheel.y < 0) // scroll down
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sdlMouseWheelState = -1;
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}
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else if (event.type == SDL_QUIT)
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running = 0;
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else if (event.type == SDL_MOUSEMOTION)
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mouseMoved = 1;
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}
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sdlMouseButtonState = SDL_GetMouseState(NULL,NULL);
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if (!SFG_mainLoopBody())
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running = 0;
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SDL_UpdateTexture(texture,NULL,sdlScreen,
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SFG_SCREEN_RESOLUTION_X * sizeof(uint16_t));
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SDL_RenderClear(renderer);
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SDL_RenderCopy(renderer,texture,NULL,NULL);
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SDL_RenderPresent(renderer);
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}
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#ifdef __EMSCRIPTEN__
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typedef void (*em_callback_func)(void);
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void emscripten_set_main_loop(
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em_callback_func func, int fps, int simulate_infinite_loop);
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#endif
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uint16_t audioBuff[SFG_SFX_SAMPLE_COUNT];
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uint16_t audioPos = 0; // audio position for the next audio buffer fill
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uint32_t audioUpdateFrame = 0; // game frame at which audio buffer fill happened
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static inline int16_t mixSamples(int16_t sample1, int16_t sample2)
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{
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return sample1 + sample2;
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}
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uint8_t musicOn = 0;
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// ^ this has to be init to 0 (not 1), else a few samples get played at start
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void audioFillCallback(void *userdata, uint8_t *s, int l)
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{
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uint16_t *s16 = (uint16_t *) s;
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for (int i = 0; i < l / 2; ++i)
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{
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s16[i] = musicOn ?
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mixSamples(audioBuff[audioPos], SDL_MUSIC_VOLUME *
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(SFG_getNextMusicSample() - SFG_musicTrackAverages[SFG_MusicState.track]))
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: audioBuff[audioPos];
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audioBuff[audioPos] = 0;
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audioPos = (audioPos < SFG_SFX_SAMPLE_COUNT - 1) ? (audioPos + 1) : 0;
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}
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audioUpdateFrame = SFG_game.frame;
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}
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void SFG_setMusic(uint8_t value)
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{
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switch (value)
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{
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case SFG_MUSIC_TURN_ON: musicOn = 1; break;
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case SFG_MUSIC_TURN_OFF: musicOn = 0; break;
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case SFG_MUSIC_NEXT: SFG_nextMusicTrack(); break;
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default: break;
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}
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}
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void SFG_playSound(uint8_t soundIndex, uint8_t volume)
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{
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uint16_t pos = (audioPos +
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((SFG_game.frame - audioUpdateFrame) * SFG_MS_PER_FRAME * 8)) %
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SFG_SFX_SAMPLE_COUNT;
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uint16_t volumeScale = 1 << (volume / 37);
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for (int i = 0; i < SFG_SFX_SAMPLE_COUNT; ++i)
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{
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audioBuff[pos] = mixSamples(audioBuff[pos],
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(128 - SFG_GET_SFX_SAMPLE(soundIndex,i)) * volumeScale);
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pos = (pos < SFG_SFX_SAMPLE_COUNT - 1) ? (pos + 1) : 0;
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}
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}
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void handleSignal(int signal)
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{
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running = 0;
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}
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int main(int argc, char *argv[])
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{
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uint8_t argHelp = 0;
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uint8_t argForceWindow = 0;
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uint8_t argForceFullscreen = 0;
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#ifndef __EMSCRIPTEN__
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argForceFullscreen = 1;
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#endif
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for (uint8_t i = 0; i < SFG_KEY_COUNT; ++i)
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webKeyboardState[i] = 0;
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for (uint8_t i = 1; i < argc; ++i)
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{
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if (argv[i][0] == '-' && argv[i][1] == 'h' && argv[i][2] == 0)
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argHelp = 1;
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else if (argv[i][0] == '-' && argv[i][1] == 'w' && argv[i][2] == 0)
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argForceWindow = 1;
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else if (argv[i][0] == '-' && argv[i][1] == 'f' && argv[i][2] == 0)
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argForceFullscreen = 1;
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else
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puts("SDL: unknown argument");
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}
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if (argHelp)
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{
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puts("Anarch (SDL), version " SFG_VERSION_STRING "\n");
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puts("Anarch is a unique suckless FPS game. Collect weapons and items and destroy");
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puts("robot enemies in your way in order to get to the level finish. Some door are");
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puts("locked and require access cards. Good luck!\n");
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puts("created by Miloslav \"drummyfish\" Ciz, 2020, released under CC0 1.0 (public domain)\n");
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puts("CLI flags:\n");
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puts("-h print this help and exit");
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puts("-w force window");
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puts("-f force fullscreen\n");
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puts("controls:\n");
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puts("- arrows, numpad, [W] [S] [A] [D] [Q] [E]: movement");
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puts("- mouse: rotation, [LMB] shoot, [RMB] toggle free look");
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puts("- [SPACE]: jump");
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puts("- [J] [RETURN] [CTRL] [LMB]: game A button (shoot, confirm)");
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puts("- [K] [SHIFT]: game B button (cancel, strafe)");
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puts("- [L]: game C button (+ down = menu, + up = jump, ...)");
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puts("- [F]: cycle next/previous weapon");
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puts("- [O] [P] [X] [Y] [Z] [mouse wheel] [mouse middle]: change weapons");
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puts("- [TAB]: map");
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puts("- [ESCAPE]: menu");
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return 0;
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}
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SFG_init();
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puts("SDL: initializing SDL");
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SDL_Init(SDL_INIT_AUDIO | SDL_INIT_JOYSTICK);
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window =
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SDL_CreateWindow("Anarch", SDL_WINDOWPOS_UNDEFINED,
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SDL_WINDOWPOS_UNDEFINED, SFG_SCREEN_RESOLUTION_X, SFG_SCREEN_RESOLUTION_Y,
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SDL_WINDOW_SHOWN);
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renderer = SDL_CreateRenderer(window,-1,0);
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texture =
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SDL_CreateTexture(renderer,SDL_PIXELFORMAT_RGB565,SDL_TEXTUREACCESS_STATIC,
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SFG_SCREEN_RESOLUTION_X,SFG_SCREEN_RESOLUTION_Y);
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screenSurface = SDL_GetWindowSurface(window);
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#if SFG_FULLSCREEN
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argForceFullscreen = 1;
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#endif
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if (!argForceWindow && argForceFullscreen)
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{
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puts("SDL: setting fullscreen");
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SDL_SetWindowFullscreen(window,SDL_WINDOW_FULLSCREEN_DESKTOP);
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}
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sdlKeyboardState = SDL_GetKeyboardState(NULL);
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sdlController = SDL_GameControllerOpen(0);
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#if !SFG_OS_IS_MALWARE
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signal(SIGINT,handleSignal);
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signal(SIGQUIT,handleSignal);
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signal(SIGTERM,handleSignal);
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#endif
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SDL_AudioSpec audioSpec;
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SDL_memset(&audioSpec, 0, sizeof(audioSpec));
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audioSpec.callback = audioFillCallback;
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audioSpec.freq = 8000;
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audioSpec.format = AUDIO_S16;
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audioSpec.channels = 1;
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#ifdef __EMSCRIPTEN__
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audioSpec.samples = 1024;
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#else
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audioSpec.samples = 256;
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#endif
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if (SDL_OpenAudio(&audioSpec,NULL) < 0)
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puts("SDL: could not initialize audio");
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for (int16_t i = 0; i < SFG_SFX_SAMPLE_COUNT; ++i)
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audioBuff[i] = 0;
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|
SDL_PauseAudio(0);
|
|
|
|
running = 1;
|
|
|
|
SDL_ShowCursor(0);
|
|
|
|
SDL_PumpEvents();
|
|
SDL_GameControllerUpdate();
|
|
|
|
SDL_WarpMouseInWindow(window,
|
|
SFG_SCREEN_RESOLUTION_X / 2, SFG_SCREEN_RESOLUTION_Y / 2);
|
|
|
|
#ifdef __EMSCRIPTEN__
|
|
emscripten_set_main_loop(mainLoopIteration,0,1);
|
|
#else
|
|
while (running)
|
|
mainLoopIteration();
|
|
#endif
|
|
|
|
puts("SDL: freeing SDL");
|
|
|
|
SDL_GameControllerClose(sdlController);
|
|
SDL_PauseAudio(1);
|
|
SDL_CloseAudio();
|
|
SDL_DestroyTexture(texture);
|
|
SDL_DestroyRenderer(renderer);
|
|
SDL_DestroyWindow(window);
|
|
|
|
puts("SDL: ending");
|
|
|
|
return 0;
|
|
}
|