mirror of
https://git.sr.ht/~rabbits/uxn
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98 lines
2.4 KiB
C
98 lines
2.4 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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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 || color % 0x5))
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continue;
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if(x < p->width && y < p->height) {
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Uint16 px = x + (flipx ? 7 - h : h);
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Uint16 py = y + (flipy ? 7 - v : v);
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Uint8 pc = ch1 ? (color & 0x3) : (color >> 0x2);
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layer->pixels[py * p->width + px] = layer->colors[pc];
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}
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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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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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