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uxn/src/devices/ppu.c

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#include "ppu.h"
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/*
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.
*/
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static Uint8 font[][8] = {
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{0x00, 0x7c, 0x82, 0x82, 0x82, 0x82, 0x82, 0x7c},
{0x00, 0x30, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10},
{0x00, 0x7c, 0x82, 0x02, 0x7c, 0x80, 0x80, 0xfe},
{0x00, 0x7c, 0x82, 0x02, 0x1c, 0x02, 0x82, 0x7c},
{0x00, 0x0c, 0x14, 0x24, 0x44, 0x84, 0xfe, 0x04},
{0x00, 0xfe, 0x80, 0x80, 0x7c, 0x02, 0x82, 0x7c},
{0x00, 0x7c, 0x82, 0x80, 0xfc, 0x82, 0x82, 0x7c},
{0x00, 0x7c, 0x82, 0x02, 0x1e, 0x02, 0x02, 0x02},
{0x00, 0x7c, 0x82, 0x82, 0x7c, 0x82, 0x82, 0x7c},
{0x00, 0x7c, 0x82, 0x82, 0x7e, 0x02, 0x82, 0x7c},
{0x00, 0x7c, 0x82, 0x02, 0x7e, 0x82, 0x82, 0x7e},
{0x00, 0xfc, 0x82, 0x82, 0xfc, 0x82, 0x82, 0xfc},
{0x00, 0x7c, 0x82, 0x80, 0x80, 0x80, 0x82, 0x7c},
{0x00, 0xfc, 0x82, 0x82, 0x82, 0x82, 0x82, 0xfc},
{0x00, 0x7c, 0x82, 0x80, 0xf0, 0x80, 0x82, 0x7c},
{0x00, 0x7c, 0x82, 0x80, 0xf0, 0x80, 0x80, 0x80}};
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Uint8
readpixel(Uint8 *sprite, Uint8 h, Uint8 v)
{
Uint8 ch1 = ((sprite[v] >> h) & 0x1);
Uint8 ch2 = (((sprite[v + 8] >> h) & 0x1) << 1);
return ch1 + ch2;
}
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void
clear(Ppu *p)
{
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int i, sz = p->height * p->width, rows = sz / 4;
for(i = 0; i < sz; ++i)
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p->output[i] = p->colors[0];
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for(i = 0; i < rows; i++) {
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p->fg[i] = 0;
p->bg[i] = 0;
}
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}
void
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putcolors(Ppu *p, Uint8 *addr)
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{
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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;
}
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}
void
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putpixel(Ppu *p, Uint8 *layer, Uint16 x, Uint16 y, Uint8 color)
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{
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Uint16 row = (y % 8) + ((x / 8 + y / 8 * p->hor) * 16), col = 7 - (x % 8);
if(x >= p->hor * 8 || y >= p->ver * 8 || row > (p->hor * p->ver * 16) - 8)
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return;
if(color == 0 || color == 2)
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layer[row] &= ~(1UL << col);
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else
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layer[row] |= 1UL << col;
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if(color == 0 || color == 1)
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layer[row + 8] &= ~(1UL << col);
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else
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layer[row + 8] |= 1UL << col;
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}
void
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puticn(Ppu *p, Uint8 *layer, Uint16 x, Uint16 y, Uint8 *sprite, Uint8 color, Uint8 flipx, Uint8 flipy)
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{
Uint16 v, h;
for(v = 0; v < 8; v++)
for(h = 0; h < 8; h++) {
Uint8 ch1 = ((sprite[v] >> (7 - h)) & 0x1);
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if(ch1 == 1 || (color != 0x05 && color != 0x0a && color != 0x0f))
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putpixel(p,
layer,
x + (flipx ? 7 - h : h),
y + (flipy ? 7 - v : v),
ch1 ? color % 4 : color / 4);
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}
}
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void
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putchr(Ppu *p, Uint8 *layer, Uint16 x, Uint16 y, Uint8 *sprite, Uint8 color, Uint8 flipx, Uint8 flipy)
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{
Uint16 v, h;
for(v = 0; v < 8; v++)
for(h = 0; h < 8; h++) {
Uint8 ch1 = ((sprite[v] >> (7 - h)) & 0x1) * color;
Uint8 ch2 = ((sprite[v + 8] >> (7 - h)) & 0x1) * color;
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putpixel(p,
layer,
x + (flipx ? 7 - h : h),
y + (flipy ? 7 - v : v),
(((ch1 + ch2 * 2) + color / 4) & 0x3));
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}
}
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/* output */
void
drawpixel(Ppu *p, Uint16 x, Uint16 y, Uint8 color)
{
if(x >= p->pad && x <= p->width - p->pad - 1 && y >= p->pad && y <= p->height - p->pad - 1)
p->output[y * p->width + x] = p->colors[color];
}
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void
drawdebugger(Ppu *p, Uint8 *stack, Uint8 ptr)
{
Uint8 i, x, y, b;
for(i = 0; i < 0x20; ++i) { /* memory */
x = ((i % 8) * 3 + 1) * 8, y = (i / 8 + 1) * 8, b = stack[i];
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puticn(p, p->bg, x, y, font[(b >> 4) & 0xf], 1 + (ptr == i) * 0x7, 0, 0);
puticn(p, p->bg, x + 8, y, font[b & 0xf], 1 + (ptr == i) * 0x7, 0, 0);
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}
for(x = 0; x < 0x20; ++x) {
drawpixel(p, x, p->height / 2, 2);
drawpixel(p, p->width - x, p->height / 2, 2);
drawpixel(p, p->width / 2, p->height - x, 2);
drawpixel(p, p->width / 2, x, 2);
drawpixel(p, p->width / 2 - 16 + x, p->height / 2, 2);
drawpixel(p, p->width / 2, p->height / 2 - 16 + x, 2);
}
}
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void
drawppu(Ppu *p)
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{
Uint16 x, y;
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for(y = 0; y < p->ver; ++y)
for(x = 0; x < p->hor; ++x) {
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Uint8 v, h;
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Uint16 key = (y * p->hor + x) * 16;
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for(v = 0; v < 8; v++)
for(h = 0; h < 8; h++) {
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Uint8 color = readpixel(&p->fg[key], h, v);
if(color == 0)
color = readpixel(&p->bg[key], h, v);
drawpixel(p, x * 8 + p->pad + 7 - h, y * 8 + p->pad + v, color);
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}
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}
}
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int
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initppu(Ppu *p, Uint8 hor, Uint8 ver, Uint8 pad)
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{
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p->hor = hor;
p->ver = ver;
p->pad = pad;
p->width = (8 * p->hor + p->pad * 2);
p->height = (8 * p->ver + p->pad * 2);
if(!(p->output = malloc(p->width * p->height * sizeof(Uint32))))
return 0;
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if(!(p->bg = malloc(p->width * p->height * sizeof(Uint8) / 4)))
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return 0;
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if(!(p->fg = malloc(p->width * p->height * sizeof(Uint8) / 4)))
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return 0;
clear(p);
return 1;
}