mirror of
https://github.com/deater/tb1.git
synced 2024-12-23 04:29:42 +00:00
135 lines
3.1 KiB
C
135 lines
3.1 KiB
C
/* Core Graphics routines for the Super VMW Graphics Library */
|
|
|
|
#include "svmwgraph.h"
|
|
#include <stdio.h>
|
|
#include <string.h> /* memset */
|
|
#include <math.h>
|
|
|
|
#define DEBUG 1
|
|
|
|
/*---------------------------------------------------------------*\
|
|
| vmwPutPixel |
|
|
\*---------------------------------------------------------------*/
|
|
|
|
void vmwPutPixel(int x,int y,int color,vmwVisual *target) {
|
|
|
|
#ifdef DEBUG
|
|
if ( (y> (target->ysize-1) ) || (x> (target->xsize-1) ) ) {
|
|
printf("Out of bounds with PutPixel %i,%i\n",x,y);
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
target->memory[(y*target->xsize)+x]=color;
|
|
|
|
}
|
|
|
|
unsigned char vmwGetPixel(int x,int y,vmwVisual *source) {
|
|
|
|
return source->memory[(y*source->xsize)+x];
|
|
|
|
}
|
|
|
|
|
|
void vmwClearScreen(vmwVisual *target, int color) {
|
|
|
|
memset(target->memory,color,target->xsize*target->ysize);
|
|
|
|
}
|
|
|
|
/*---------------------------------------------------------------*\
|
|
| vmwDrawHLine |
|
|
| This is really begging to be optimized. I am sure some |
|
|
| targets can do this in hardware |
|
|
\*---------------------------------------------------------------*/
|
|
|
|
void vmwDrawHLine(int xstart,int ystart,int how_long,int color,
|
|
vmwVisual *target) {
|
|
|
|
unsigned char *temp_pointer;
|
|
int i;
|
|
|
|
temp_pointer=target->memory+(ystart*target->xsize)+xstart;
|
|
|
|
for(i=0;i<how_long;i++) {
|
|
*temp_pointer=color;
|
|
temp_pointer++;
|
|
#ifdef DEBUG
|
|
if (xstart+i>target->xsize-1) {
|
|
printf("Out of bounds!\n");
|
|
return;
|
|
}
|
|
#endif
|
|
}
|
|
}
|
|
|
|
|
|
void vmwDrawVLine(int xstart,int ystart,int how_long,int color,
|
|
vmwVisual *target) {
|
|
|
|
unsigned char *temp_pointer;
|
|
int i;
|
|
|
|
temp_pointer=target->memory+(ystart*target->xsize)+xstart;
|
|
|
|
for(i=0;i<how_long;i++) {
|
|
*temp_pointer=color;
|
|
temp_pointer+=target->xsize;
|
|
}
|
|
}
|
|
|
|
|
|
int sgn(float a) {
|
|
if (a>0) return 1;
|
|
if (a<0) return -1;
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* I don't pretend to understand the following yet. Taken
|
|
* from PCGPE. Might re-write by self when get around to it */
|
|
void vmwLine(int x1,int y1,int x2,int y2,int color,vmwVisual *destination) {
|
|
|
|
float dx,dy,d1x,d1y,d2x,d2y,m,n,s;
|
|
int i;
|
|
|
|
dx = x2 - x1;
|
|
dy = y2 - y1;
|
|
|
|
d1x=sgn(dx);
|
|
d1y=sgn(dy);
|
|
d2x=sgn(dx);
|
|
d2y= 0.0;
|
|
|
|
m=fabs(dx);
|
|
n=fabs(dy);
|
|
if (!(m>n)) {
|
|
d2x=0;
|
|
d2y=sgn(dy);
|
|
m=fabs(dy);
|
|
n=fabs(dx);
|
|
}
|
|
s=rint(m / 2);
|
|
for (i= 0;i< (int)m;i++) {
|
|
vmwPutPixel(x1,y1,color,destination);
|
|
s+=n;
|
|
if (!(s<m)) {
|
|
s-=m;
|
|
x1+=rint(d1x);
|
|
y1+=rint(d1y);
|
|
}
|
|
else {
|
|
x1+=rint(d2x);
|
|
y1+=rint(d2y);
|
|
}
|
|
}
|
|
}
|
|
|
|
void vmwDrawBox(int x1,int y1,int xsize,int ysize,int col, vmwVisual *where) {
|
|
int i;
|
|
|
|
for(i=0;i<ysize;i++) {
|
|
vmwDrawHLine(x1,y1+i,xsize,col,where);
|
|
}
|
|
}
|