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Add linux terminal support

merge-requests/1/merge
Miloslav Číž 3 months ago
parent
commit
3ce97dbf33
2 changed files with 115 additions and 8 deletions
  1. +1
    -1
      README.md
  2. +114
    -7
      main_terminal.c

+ 1
- 1
README.md View File

@ -27,7 +27,7 @@ This game got some attention on 4chan: [1](https://archive.li/Yzcwt), [2](https:
- **Extemely low HW demands** (much less than Doom, no GPU, no FPU, just kilobytes of RAM and storage).
- **Suckless, KISS, minimal, simple**, short code (~10000 LOC).
- **Extremely portable**. So far officially ported to and tested on:
- GNU/Linux PC: SDL, csfml, terminal
- GNU/Linux PC: SDL, csfml, terminal (experimental), Linux framebuffer (experimental)
- Winshit XP SDL
- Browser
- Pokitto (220 x 116, 48 MHz ARM, 36 KB RAM, 256 KB flash)


+ 114
- 7
main_terminal.c View File

@ -1,5 +1,7 @@
/**
@file main_pokitto.cpp
@file main_terminal.c
WARNING: VERY EXPERIMENTAL
This is Linux terminal implementation of the game front end. If you replace
the input methods, it will most likely run in other terminals as well. This
@ -15,6 +17,16 @@
whatsoever.
*/
#ifndef USE_LINUX_FRAMEBUFFER
#define USE_LINUX_FRAMEBUFFER 1
#endif
// IMPORTANT: You must set these files correctly:
#define DEV_KEYBOARD "/dev/input/event3"
#define DEV_MOUSE "/dev/input/event1"
#define DEV_TTY "/dev/tty3"
#define DEV_FRAMBUFFER "/dev/fb0"
#include <stdint.h>
#include <unistd.h>
#include <signal.h>
@ -26,8 +38,22 @@
#include "smallinput.h"
#define SFG_SCREEN_RESOLUTION_X 127
#define SFG_SCREEN_RESOLUTION_Y 42
#if USE_LINUX_FRAMEBUFFER
#include <stdlib.h>
#include <linux/fb.h>
#include <linux/kd.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#endif
#if USE_LINUX_FRAMEBUFFER
#define SFG_SCREEN_RESOLUTION_X 640
#define SFG_SCREEN_RESOLUTION_Y 480
#else
#define SFG_SCREEN_RESOLUTION_X 127
#define SFG_SCREEN_RESOLUTION_Y 42
#endif
#define SFG_DITHERED_SHADOW 1
#define SFG_FPS 30
@ -36,6 +62,7 @@
#define SCREENSIZE ((SFG_SCREEN_RESOLUTION_X + 1) * SFG_SCREEN_RESOLUTION_Y + 1)
char screen[SCREENSIZE];
uint8_t *screenUnsigned = (uint8_t *) screen;
const char shades[] = // adjust according to your terminal
{
@ -54,8 +81,13 @@ uint32_t getTime()
void SFG_setPixel(uint16_t x, uint16_t y, uint8_t colorIndex)
{
#if USE_LINUX_FRAMEBUFFER
screenUnsigned[y * SFG_SCREEN_RESOLUTION_X + x] =
colorIndex;
#else
screen[y * (SFG_SCREEN_RESOLUTION_X + 1) + x] =
shades[(colorIndex > 7) * 8 + colorIndex % 8];
#endif
}
uint32_t SFG_getTimeMs()
@ -125,7 +157,9 @@ int running = 1;
void handleSignal(int signal)
{
#if !USE_LINUX_FRAMEBUFFER
puts("\033[?25h"); // show cursor
#endif
running = 0;
}
@ -142,6 +176,38 @@ int main()
screen[SCREENSIZE - 1] = 0; // string terminator
#if USE_LINUX_FRAMEBUFFER
#define CHECK(w,err,msg)\
if ((w) == (err)) { puts(msg); return 1; }
int tty = open(DEV_TTY,O_RDWR);
CHECK(tty,-1,"couldn't open TTY device")
CHECK(ioctl(tty,KDSETMODE,KD_GRAPHICS),-1,"couldn't set graphic mode")
int fb = open(DEV_FRAMBUFFER,O_RDWR);
CHECK(fb,-1,"couldn't open framebuffer device")
struct fb_fix_screeninfo fixInfo;
struct fb_var_screeninfo varInfo;
CHECK(ioctl(fb,FBIOGET_FSCREENINFO,&fixInfo),-1,"couldn't get fixInfo")
CHECK(ioctl(fb,FBIOGET_VSCREENINFO,&varInfo),-1,"couldn't get varInfo")
int bpp = varInfo.bits_per_pixel / 8;
uint64_t screenSize = varInfo.xres * varInfo.yres * bpp;
char *fbScreen = mmap(0,screenSize,PROT_READ | PROT_WRITE,MAP_SHARED,fb,0);
CHECK(fbScreen,MAP_FAILED,"couldn't map framebuffer")
int r = varInfo.red.offset / 8,
g = varInfo.green.offset / 8,
b = varInfo.blue.offset / 8,
t = varInfo.transp.offset / 8;
#else
for (uint16_t i = 1; i <= SFG_SCREEN_RESOLUTION_Y; ++i)
screen[i * (SFG_SCREEN_RESOLUTION_X + 1) - 1] = '\n';
@ -151,20 +217,61 @@ int main()
putchar('\n');
puts("\033[?25l"); // hide cursor
#endif
while (running)
{
input_update();
#if USE_LINUX_FRAMEBUFFER
char *p = fbScreen;
int linePad = fixInfo.line_length - SFG_SCREEN_RESOLUTION_X * bpp;
int index = 0;
for (int y = 0; y < SFG_SCREEN_RESOLUTION_Y; ++y)
{
for (int x = 0; x < SFG_SCREEN_RESOLUTION_X; ++x)
{
// inefficient, should be a precomputed RGB32 palette
uint16_t c = paletteRGB565[screenUnsigned[index]];
*(p + b) = (c << 3) & 0xf8;
*(p + g) = (c >> 3) & 0xfc;
*(p + r) = (c >> 8) & 0xf8;
p += bpp;
index++;
}
p += linePad;
}
#else
puts("\033[0;0H"); // move cursor to 0;0
puts(screen);
fflush(stdout);
#endif
if (!SFG_mainLoopBody())
running = 0;
}
puts("\033[?25h"); // show cursor
// if (SFG_game.frame > 1000) break; // uncomment for testing, prevents locking
}
input_end();
#if USE_LINUX_FRAMEBUFFER
munmap(screen,screenSize);
ioctl(tty,KDSETMODE,KD_TEXT); // set back to text mode
close(fb);
close(tty);
#else
puts("\033[?25h"); // show cursor
#endif
}

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