mirror of
https://gitlab.com/drummyfish/anarch.git
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327 lines
7.5 KiB
C
327 lines
7.5 KiB
C
/**
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@file platform_sdl.h
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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 transpired JS browser version with
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emscripten.
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To compile with emscripten run:
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emcc ./main.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
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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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#ifndef _SFG_PLATFORM_H
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#define _SFG_PLATFORM_H
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#include "settings.h"
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#include <stdio.h>
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#include <SDL2/SDL.h>
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#include "palette.h"
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#include "sounds.h"
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#undef SFG_LOG
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#define SFG_LOG(str) printf("game: %s\n",str);
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#undef SFG_BACKGROUND_BLUR
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#define SFG_BACKGROUND_BLUR 1
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const uint8_t *sdlKeyboardState;
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uint16_t screen[SFG_SCREEN_RESOLUTION_X * SFG_SCREEN_RESOLUTION_Y]; // RGB565 format
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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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void SFG_setPixel(uint16_t x, uint16_t y, uint8_t colorIndex)
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{
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screen[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_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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void SFG_getMouseOffset(int16_t *x, int16_t *y)
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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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int8_t SFG_keyPressed(uint8_t key)
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{
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switch (key)
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{
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case SFG_KEY_UP:
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return sdlKeyboardState[SDL_SCANCODE_UP] ||
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sdlKeyboardState[SDL_SCANCODE_W] ||
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sdlKeyboardState[SDL_SCANCODE_KP_8];
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break;
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case SFG_KEY_RIGHT:
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return sdlKeyboardState[SDL_SCANCODE_RIGHT] ||
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sdlKeyboardState[SDL_SCANCODE_E] ||
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sdlKeyboardState[SDL_SCANCODE_KP_6];
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break;
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case SFG_KEY_DOWN:
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return sdlKeyboardState[SDL_SCANCODE_DOWN] ||
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sdlKeyboardState[SDL_SCANCODE_S] ||
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sdlKeyboardState[SDL_SCANCODE_KP_5] ||
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sdlKeyboardState[SDL_SCANCODE_KP_2];
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break;
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case SFG_KEY_LEFT:
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return sdlKeyboardState[SDL_SCANCODE_LEFT] ||
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sdlKeyboardState[SDL_SCANCODE_Q] ||
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sdlKeyboardState[SDL_SCANCODE_KP_4];
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break;
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case SFG_KEY_A:
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return sdlKeyboardState[SDL_SCANCODE_G];
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break;
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case SFG_KEY_B:
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return sdlKeyboardState[SDL_SCANCODE_H] || SDL_GetMouseState(0,0);
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break;
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case SFG_KEY_C:
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return sdlKeyboardState[SDL_SCANCODE_J];
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break;
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case SFG_KEY_JUMP:
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return sdlKeyboardState[SDL_SCANCODE_SPACE];
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break;
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case SFG_KEY_STRAFE_LEFT:
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return sdlKeyboardState[SDL_SCANCODE_A] ||
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sdlKeyboardState[SDL_SCANCODE_KP_7];
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break;
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case SFG_KEY_STRAFE_RIGHT:
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return sdlKeyboardState[SDL_SCANCODE_D] ||
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sdlKeyboardState[SDL_SCANCODE_KP_9];
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break;
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case SFG_KEY_MAP:
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return sdlKeyboardState[SDL_SCANCODE_TAB];
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break;
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case SFG_KEY_TOGGLE_FREELOOK:
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return sdlKeyboardState[SDL_SCANCODE_T];
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break;
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case SFG_KEY_NEXT_WEAPON:
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return sdlKeyboardState[SDL_SCANCODE_M];
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break;
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case SFG_KEY_PREVIOUS_WEAPON:
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return sdlKeyboardState[SDL_SCANCODE_N];
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break;
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case SFG_KEY_MENU:
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return sdlKeyboardState[SDL_SCANCODE_X];
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break;
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default: return 0; break;
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}
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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_PumpEvents(); // updates the keyboard state
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if (sdlKeyboardState[SDL_SCANCODE_ESCAPE])
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running = 0;
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SFG_mainLoopBody();
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SDL_UpdateTexture(texture,NULL,screen,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(em_callback_func func, int fps, int simulate_infinite_loop);
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#endif
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uint8_t audioBuff[SFG_SFX_SAMPLE_COUNT];
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uint16_t audioPos = 0;
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static inline uint8_t mixSamples(uint8_t sample1, uint8_t sample2)
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{
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return (((uint16_t) sample1) + ((uint16_t) sample2)) / 2;
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}
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uint8_t musicOn = 1;
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void audioFillCallback(void *userdata, uint8_t *s, int l)
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{
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for (int i = 0; i < l; ++i)
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{
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s[i] = musicOn ?
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mixSamples(audioBuff[audioPos],SFG_getNextMusicSample() / 2) :
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audioBuff[audioPos];
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audioBuff[audioPos] = 127;
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audioPos = (audioPos < SFG_SFX_SAMPLE_COUNT - 1) ? (audioPos + 1) : 0;
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}
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}
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void SFG_enableMusic(uint8_t enable)
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{
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musicOn = enable;
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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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uint8_t volumeStep = volume / 16;
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uint16_t pos = audioPos;
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for (int i = 0; i < SFG_SFX_SAMPLE_COUNT; ++i)
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{
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audioBuff[pos] =
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mixSamples(audioBuff[pos],SFG_GET_SFX_SAMPLE(soundIndex,i) * volumeStep);
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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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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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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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printf("SDL: unknown argument: %s\n",argv[i]);
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}
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if (argHelp)
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{
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printf("TODOGAME, a suckless first person shooter game (SDL2 frontend)\n\n");
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printf("version TODO, by Miloslav Ciz, released under CC0 1.0 + waiver of all IP\n");
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printf("possible arguments:\n\n");
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printf("-h print this help and end\n");
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printf("-w force run in window\n");
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printf("-f force run fullscreen\n\n");
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printf("controls:\n");
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printf("TODO\n");
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return 0;
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}
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printf("SDL: starting\n");
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printf("SDL: initializing SDL\n");
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window =
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SDL_CreateWindow("raycasting", 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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printf("SDL: setting fullscreen\n");
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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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SDL_ShowCursor(0);
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SFG_init(SDL_INIT_AUDIO);
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SDL_AudioSpec audioSpec;
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audioSpec.callback = audioFillCallback;
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audioSpec.userdata = 0;
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audioSpec.freq = 8000;
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audioSpec.format = AUDIO_U8;
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audioSpec.channels = 1;
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audioSpec.samples = 128;
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if (SDL_OpenAudio(&audioSpec,0) < 0)
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printf("SDL: could not initialize audio\n");
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for (int i = 0; i < SFG_SFX_SAMPLE_COUNT; ++i)
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audioBuff[i] = 127;
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SDL_PauseAudio(0);
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running = 1;
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#ifdef __EMSCRIPTEN__
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emscripten_set_main_loop(mainLoopIteration,0,1);
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#else
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while (running)
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mainLoopIteration();
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#endif
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printf("SDL: freeing SDL\n");
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SDL_PauseAudio(1);
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SDL_DestroyTexture(texture);
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SDL_DestroyRenderer(renderer);
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SDL_DestroyWindow(window);
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SDL_CloseAudio();
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printf("SDL: ending\n");
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return 0;
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}
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#endif // guard
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