83 lines
2.0 KiB
C
83 lines
2.0 KiB
C
|
/*
|
||
|
|
Copyright (c) 2021 Devine Lu Linvega
|
||
|
|
Copyright (c) 2021 Andrew Alderwick
|
||
|
|
|
||
|
|
Permission to use, copy, modify, and distribute this software for any
|
||
|
|
purpose with or without fee is hereby granted, provided that the above
|
||
|
|
copyright notice and this permission notice appear in all copies.
|
||
|
|
|
||
|
|
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
||
|
|
WITH REGARD TO THIS SOFTWARE.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "ppu.h"
|
||
|
|
|
||
|
|
void
|
||
|
|
clear(Ppu *p)
|
||
|
|
{
|
||
|
|
int v, h;
|
||
|
|
for(v = 0; v < HEIGHT; v++)
|
||
|
|
for(h = 0; h < WIDTH; h++)
|
||
|
|
p->output[v * WIDTH + h] = p->colors[0];
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
drawpixel(Ppu *p, Uint16 x, Uint16 y, Uint8 color)
|
||
|
|
{
|
||
|
|
if(x >= p->x1 && x <= p->x2 && y >= p->x1 && y <= p->y2)
|
||
|
|
p->output[y * WIDTH + x] = p->colors[color];
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
drawchr(Ppu *p, Uint16 x, Uint16 y, Uint8 *sprite, Uint8 alpha)
|
||
|
|
{
|
||
|
|
Uint8 v, h;
|
||
|
|
for(v = 0; v < 8; v++)
|
||
|
|
for(h = 0; h < 8; h++) {
|
||
|
|
Uint8 ch1 = ((sprite[v] >> h) & 0x1);
|
||
|
|
Uint8 ch2 = (((sprite[v + 8] >> h) & 0x1) << 1);
|
||
|
|
if(!alpha || (alpha && ch1 + ch2 != 0))
|
||
|
|
drawpixel(p, x + 7 - h, y + v, ch1 + ch2);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
drawicn(Ppu *p, Uint16 x, Uint16 y, Uint8 *sprite, Uint8 fg, Uint8 bg)
|
||
|
|
{
|
||
|
|
Uint8 v, h;
|
||
|
|
for(v = 0; v < 8; v++)
|
||
|
|
for(h = 0; h < 8; h++) {
|
||
|
|
Uint8 ch1 = (sprite[v] >> (7 - h)) & 0x1;
|
||
|
|
drawpixel(p, x + h, y + v, ch1 ? fg : bg);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
paintpixel(Uint8 *dst, Uint16 x, Uint16 y, Uint8 color)
|
||
|
|
{
|
||
|
|
Uint16 row = (y % 8) + ((x / 8 + y / 8 * HOR) * 16), col = 7 - (x % 8);
|
||
|
|
if(x >= HOR * 8 || y >= VER * 8 || row > RES - 8)
|
||
|
|
return;
|
||
|
|
if(color == 0 || color == 2)
|
||
|
|
dst[row] &= ~(1UL << col);
|
||
|
|
else
|
||
|
|
dst[row] |= 1UL << col;
|
||
|
|
if(color == 0 || color == 1)
|
||
|
|
dst[row + 8] &= ~(1UL << col);
|
||
|
|
else
|
||
|
|
dst[row + 8] |= 1UL << col;
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
loadtheme(Ppu *p, Uint8 *addr)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
for(i = 0; i < 4; ++i) {
|
||
|
|
Uint8
|
||
|
|
r = (*(addr + i / 2) >> (!(i % 2) << 2)) & 0x0f,
|
||
|
|
g = (*(addr + 2 + i / 2) >> (!(i % 2) << 2)) & 0x0f,
|
||
|
|
b = (*(addr + 4 + i / 2) >> (!(i % 2) << 2)) & 0x0f;
|
||
|
|
p->colors[i] = (r << 20) + (r << 16) + (g << 12) + (g << 8) + (b << 4) + b;
|
||
|
|
}
|
||
|
|
p->reqdraw = 1;
|
||
|
|
}
|