From dac585ae4352539fbe365910e49456b90fe913a8 Mon Sep 17 00:00:00 2001
From: Daniel Jones <admin@danieljon.es>
Date: Sat, 17 Oct 2020 00:31:08 +1030
Subject: use getopts for argument parsing
---
main.c | 42 +++++++++++++++++++++++++++---------------
1 file changed, 27 insertions(+), 15 deletions(-)
diff --git a/main.c b/main.c
index 44a7bfc..e7e5d64 100644
--- a/main.c
+++ b/main.c
@@ -15,6 +15,7 @@
#include <stdio.h>
#include <stdlib.h>
+#include <unistd.h>
#include <SDL2/SDL.h>
#include "chip8.h"
@@ -28,7 +29,8 @@
* https://slack-files.com/T3CH37TNX-F3RKEUKL4-b05ab4930d?nojsmode=1
*/
-//#define VIDEO_SCALE 5
+#define DEFAULT_VIDEO_SCALE 10
+#define DEFAULT_FPS 500
SDL_Window *window;
SDL_Renderer *renderer;
@@ -45,8 +47,10 @@ void handle_key_up(int keycode);
uint8_t get_chip8_key(int keycode);
void print_registers();
-int VIDEO_SCALE = 5;
+int video_scale = DEFAULT_VIDEO_SCALE;
+int fps = DEFAULT_FPS;
int step_cycle = 0;
+char *rom = NULL;
extern uint32_t video[WIDTH*HEIGHT];
extern int draw_flag;
@@ -59,12 +63,6 @@ extern uint8_t delay_timer;
extern uint8_t sound_timer;
extern uint16_t stack[STACK_SIZE];
-void
-usage(char *program)
-{
- printf("usage: %s [scale] [speed] [romfile]\nscale - pixel scaling (~5 recommended)\nspeed - how many cycles per second should be run (60-1000 or so, depends on the game)\n", program);
-}
-
void
quit()
{
@@ -78,7 +76,7 @@ void
init_video()
{
SDL_Init(SDL_INIT_VIDEO);
- window = SDL_CreateWindow("chip8 interpreter", 0, 0, WIDTH*VIDEO_SCALE, HEIGHT*VIDEO_SCALE, SDL_WINDOW_SHOWN);
+ window = SDL_CreateWindow("chip8 interpreter", 0, 0, WIDTH*video_scale, HEIGHT*video_scale, SDL_WINDOW_SHOWN);
renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);
texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_RGBA32, SDL_TEXTUREACCESS_STREAMING, WIDTH, HEIGHT);
}
@@ -204,17 +202,32 @@ handle_sdl_events()
int main(int argc, char *argv[])
{
- if (argc < 4)
+ char opt;
+ int index;
+
+ while ((opt = getopt(argc, argv, "s:f:")) != -1)
{
- usage(argv[0]);
- exit(EXIT_FAILURE);
+ switch (opt)
+ {
+ case 's':
+ video_scale = atoi(optarg);
+ break;
+ case 'f':
+ fps = atoi(optarg);
+ break;
+ default: break;
+ }
+ }
+
+ for (index = optind; index < argc; index++)
+ {
+ rom = argv[index];
}
- VIDEO_SCALE = atoi(argv[1]);
chip8_init();
- if (!load_rom(argv[3]))
+ if (!load_rom(rom))
{
fprintf(stderr, "cannot start interpreter\n");
exit(EXIT_FAILURE);
@@ -222,7 +235,6 @@ int main(int argc, char *argv[])
init_video();
- const int fps = atoi(argv[2]);
const uint32_t frame_delay = 1000/fps;
uint32_t frame_start;
uint32_t frame_time;
--
cgit v1.2.3