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gr-sim: make it a library

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This commit is contained in:
Vince Weaver 2017-05-02 10:56:59 -04:00
parent 10e10a2576
commit f75da270f7
4 changed files with 94 additions and 21 deletions
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12
gr-sim/Makefile
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@ -5,15 +5,19 @@ LFLAGS =
SDL_LIBS= `sdl-config --libs`
SDL_INCLUDE= `sdl-config --cflags`
all: gr-sim
all: rainbow
rainbow: rainbow.o gr-sim.o
$(CC) $(LFLAGS) $(SDL_LIBS) -o rainbow rainbow.o gr-sim.o
rainbow.o: rainbow.c
$(CC) $(CFLAGS) -c rainbow.c
gr-sim: gr-sim.o
$(CC) $(LFLAGS) $(SDL_LIBS) -o gr-sim gr-sim.o
gr-sim.o: gr-sim.c
$(CC) $(CFLAGS) $(SDL_INCLUDE) -c gr-sim.c
clean:
rm -f *~ *.o gr-sim
rm -f *~ *.o gr-sim rainbow

57
gr-sim/gr-sim.c
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@ -4,6 +4,8 @@
#include <SDL.h>
#include "gr-sim.h"
#define XSIZE 40
#define YSIZE 48
@ -15,7 +17,13 @@ static int ysize=YSIZE*PIXEL_Y_SCALE;
static unsigned char framebuffer[XSIZE][YSIZE];
static int get_input(void) {
/* 128kB of RAM */
unsigned char ram[128*1024];
static SDL_Surface *sdl_screen=NULL;
int grsim_input(void) {
SDL_Event event;
int keypressed;
@ -71,12 +79,12 @@ static unsigned int color[16]={
0xffffff, /* 15 white */
};
static int gr_to_screen(SDL_Surface *screen) {
int grsim_update(void) {
int x,y,i,j;
unsigned int *t_pointer;
t_pointer=((Uint32 *)screen->pixels);
t_pointer=((Uint32 *)sdl_screen->pixels);
for(y=0;y<YSIZE;y++) {
for(j=0;j<PIXEL_Y_SCALE;j++) {
@ -89,19 +97,15 @@ static int gr_to_screen(SDL_Surface *screen) {
}
}
SDL_UpdateRect(screen, 0, 0, xsize, ysize);
SDL_UpdateRect(sdl_screen, 0, 0, xsize, ysize);
return 0;
}
int main(int argc, char **argv) {
SDL_Surface *sdl_screen=NULL;
int grsim_init(void) {
int mode;
int ch;
int x,y;
mode=SDL_SWSURFACE|SDL_HWPALETTE|SDL_HWSURFACE;
@ -127,18 +131,37 @@ int main(int argc, char **argv) {
/* Init screen */
for(y=0;y<YSIZE;y++) for(x=0;x<XSIZE;x++) framebuffer[x][y]=0;
/* Put rainbow on screen */
for(y=0;y<40;y++) for(x=0;x<XSIZE;x++) framebuffer[x][y]=y%16;
return 0;
}
while(1) {
gr_to_screen(sdl_screen);
static int current_color=0;
ch=get_input();
if (ch=='q') break;
int color_equals(int new_color) {
current_color=new_color;
return 0;
}
usleep(100000);
int plot(int x, int y) {
framebuffer[x][y]=current_color;
return 0;
}
}
int hlin(int x1, int x2, int at) {
int i;
for(i=x1;i<x2;i++) plot(i,at);
return 0;
}
int vlin(int y1, int y2, int at) {
int i;
for(i=y1;i<y2;i++) plot(at,i);
return 0;
}

8
gr-sim/gr-sim.h Normal file
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@ -0,0 +1,8 @@
extern unsigned char ram[128*1024];
int grsim_input(void);
int grsim_update(void);
int grsim_init(void);
int color_equals(int new_color);
int plot(int x, int y);
int hlin(int x1, int x2, int at);
int vlin(int y1, int y2, int at);

38
gr-sim/rainbow.c Normal file
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@ -0,0 +1,38 @@
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "gr-sim.h"
int main(int argc, char **argv) {
int x,y,ch;
grsim_init();
/* Put rainbow on screen */
for(y=0;y<40;y++) for(x=0;x<40;x++) {
color_equals(y%16);
plot(x,y);
}
color_equals(15);
vlin(0,40,20);
color_equals(0);
hlin(0,40,20);
while(1) {
grsim_update();
ch=grsim_input();
if (ch=='q') break;
usleep(100000);
}
return 0;
}