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https://git.sr.ht/~rabbits/uxn
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85 lines
2.1 KiB
C
85 lines
2.1 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 blending1bpp[2][16] = {
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{0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3},
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{0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3}};
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static Uint8 blending2bpp[4][16] = {
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{0, 0, 0, 0, 1, 0, 1, 1, 2, 2, 0, 2, 3, 3, 3, 0},
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{0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3},
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{1, 2, 3, 1, 1, 2, 3, 1, 1, 2, 3, 1, 1, 2, 3, 1},
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{2, 3, 1, 2, 2, 3, 1, 2, 2, 3, 1, 2, 2, 3, 1, 2}};
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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->pixels[i] = 0x00;
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}
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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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Uint8 *pixel = &p->pixels[y * p->width + x], shift = layer * 2;
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if(x < p->width && y < p->height)
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*pixel = (*pixel & ~(0x3 << shift)) | (color << shift);
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}
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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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{
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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 != 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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blending1bpp[ch1][color]);
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}
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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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{
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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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Uint8 ch2 = ((sprite[v + 8] >> (7 - h)) & 0x1);
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Uint8 ch = ch1 + ch2 * 2;
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if(ch || (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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blending2bpp[ch][color]);
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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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return 1;
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}
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