mirror of https://git.sr.ht/~rabbits/uxn
142 lines
4.0 KiB
C
142 lines
4.0 KiB
C
#include "ppu.h"
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/*
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Copyright (c) 2021 Devine Lu Linvega
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Copyright (c) 2021 Andrew Alderwick
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Permission to use, copy, modify, and distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE.
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*/
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static Uint8 font[][8] = {
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{0x00, 0x7c, 0x82, 0x82, 0x82, 0x82, 0x82, 0x7c},
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{0x00, 0x30, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10},
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{0x00, 0x7c, 0x82, 0x02, 0x7c, 0x80, 0x80, 0xfe},
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{0x00, 0x7c, 0x82, 0x02, 0x1c, 0x02, 0x82, 0x7c},
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{0x00, 0x0c, 0x14, 0x24, 0x44, 0x84, 0xfe, 0x04},
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{0x00, 0xfe, 0x80, 0x80, 0x7c, 0x02, 0x82, 0x7c},
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{0x00, 0x7c, 0x82, 0x80, 0xfc, 0x82, 0x82, 0x7c},
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{0x00, 0x7c, 0x82, 0x02, 0x1e, 0x02, 0x02, 0x02},
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{0x00, 0x7c, 0x82, 0x82, 0x7c, 0x82, 0x82, 0x7c},
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{0x00, 0x7c, 0x82, 0x82, 0x7e, 0x02, 0x82, 0x7c},
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{0x00, 0x7c, 0x82, 0x02, 0x7e, 0x82, 0x82, 0x7e},
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{0x00, 0xfc, 0x82, 0x82, 0xfc, 0x82, 0x82, 0xfc},
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{0x00, 0x7c, 0x82, 0x80, 0x80, 0x80, 0x82, 0x7c},
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{0x00, 0xfc, 0x82, 0x82, 0x82, 0x82, 0x82, 0xfc},
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{0x00, 0x7c, 0x82, 0x80, 0xf0, 0x80, 0x82, 0x7c},
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{0x00, 0x7c, 0x82, 0x80, 0xf0, 0x80, 0x80, 0x80}};
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Uint8
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readpixel(Uint8 *sprite, Uint8 h, Uint8 v)
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{
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Uint8 ch1 = ((sprite[v] >> h) & 0x1);
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Uint8 ch2 = (((sprite[v + 8] >> h) & 0x1) << 1);
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return ch1 + ch2;
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}
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void
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clear(Ppu *p)
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{
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int i, sz = p->height * p->width;
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for(i = 0; i < sz; ++i) {
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p->fg.pixels[i] = p->fg.colors[0];
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p->bg.pixels[i] = p->bg.colors[0];
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}
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}
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void
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putcolors(Ppu *p, Uint8 *addr)
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{
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int i;
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for(i = 0; i < 4; ++i) {
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Uint8
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r = (*(addr + i / 2) >> (!(i % 2) << 2)) & 0x0f,
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g = (*(addr + 2 + i / 2) >> (!(i % 2) << 2)) & 0x0f,
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b = (*(addr + 4 + i / 2) >> (!(i % 2) << 2)) & 0x0f;
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p->bg.colors[i] = 0xff000000 | (r << 20) | (r << 16) | (g << 12) | (g << 8) | (b << 4) | b;
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p->fg.colors[i] = 0xff000000 | (r << 20) | (r << 16) | (g << 12) | (g << 8) | (b << 4) | b;
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}
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p->fg.colors[0] = 0;
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clear(p);
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}
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void
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putpixel(Ppu *p, Layer *layer, Uint16 x, Uint16 y, Uint8 color)
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{
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if(x >= p->width || y >= p->height)
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return;
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layer->pixels[y * p->width + x] = layer->colors[color];
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}
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void
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puticn(Ppu *p, Layer *layer, Uint16 x, Uint16 y, Uint8 *sprite, Uint8 color, Uint8 flipx, Uint8 flipy)
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{
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Uint16 v, h;
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for(v = 0; v < 8; v++)
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for(h = 0; h < 8; h++) {
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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,
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layer,
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x + (flipx ? 7 - h : h),
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y + (flipy ? 7 - v : v),
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ch1 ? color % 4 : color / 4);
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}
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}
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void
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putchr(Ppu *p, Layer *layer, Uint16 x, Uint16 y, Uint8 *sprite, Uint8 color, Uint8 flipx, Uint8 flipy)
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{
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Uint16 v, h;
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for(v = 0; v < 8; v++)
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for(h = 0; h < 8; h++) {
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Uint8 ch1 = ((sprite[v] >> (7 - h)) & 0x1) * color;
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Uint8 ch2 = ((sprite[v + 8] >> (7 - h)) & 0x1) * color;
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putpixel(p,
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layer,
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x + (flipx ? 7 - h : h),
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y + (flipy ? 7 - v : v),
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(((ch1 + ch2 * 2) + color / 4) & 0x3));
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}
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}
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/* output */
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void
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inspect(Ppu *p, Uint8 *stack, Uint8 ptr)
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{
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Uint8 i, x, y, b;
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for(i = 0; i < 0x20; ++i) { /* memory */
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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);
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puticn(p, &p->bg, x + 8, y, font[b & 0xf], 1 + (ptr == i) * 0x7, 0, 0);
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}
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for(x = 0; x < 0x20; ++x) {
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putpixel(p, &p->bg, x, p->height / 2, 2);
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putpixel(p, &p->bg, p->width - x, p->height / 2, 2);
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putpixel(p, &p->bg, p->width / 2, p->height - x, 2);
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putpixel(p, &p->bg, p->width / 2, x, 2);
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putpixel(p, &p->bg, p->width / 2 - 16 + x, p->height / 2, 2);
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putpixel(p, &p->bg, p->width / 2, p->height / 2 - 16 + x, 2);
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}
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}
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int
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initppu(Ppu *p, Uint8 hor, Uint8 ver)
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{
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p->hor = hor;
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p->ver = ver;
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p->width = 8 * p->hor;
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p->height = 8 * p->ver;
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if(!(p->bg.pixels = malloc(p->width * p->height * sizeof(Uint32))))
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return 0;
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if(!(p->fg.pixels = malloc(p->width * p->height * sizeof(Uint32))))
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return 0;
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clear(p);
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return 1;
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}
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