mirror of https://git.sr.ht/~rabbits/uxn
83 lines
2.0 KiB
C
83 lines
2.0 KiB
C
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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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#include "ppu.h"
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void
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clear(Ppu *p)
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{
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int v, h;
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for(v = 0; v < HEIGHT; v++)
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for(h = 0; h < WIDTH; h++)
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p->output[v * WIDTH + h] = p->colors[0];
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}
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void
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drawpixel(Ppu *p, Uint16 x, Uint16 y, Uint8 color)
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{
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if(x >= p->x1 && x <= p->x2 && y >= p->x1 && y <= p->y2)
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p->output[y * WIDTH + x] = p->colors[color];
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}
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void
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drawchr(Ppu *p, Uint16 x, Uint16 y, Uint8 *sprite, Uint8 alpha)
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{
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Uint8 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] >> h) & 0x1);
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Uint8 ch2 = (((sprite[v + 8] >> h) & 0x1) << 1);
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if(!alpha || (alpha && ch1 + ch2 != 0))
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drawpixel(p, x + 7 - h, y + v, ch1 + ch2);
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}
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}
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void
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drawicn(Ppu *p, Uint16 x, Uint16 y, Uint8 *sprite, Uint8 fg, Uint8 bg)
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{
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Uint8 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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drawpixel(p, x + h, y + v, ch1 ? fg : bg);
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}
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}
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void
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paintpixel(Uint8 *dst, Uint16 x, Uint16 y, Uint8 color)
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{
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Uint16 row = (y % 8) + ((x / 8 + y / 8 * HOR) * 16), col = 7 - (x % 8);
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if(x >= HOR * 8 || y >= VER * 8 || row > RES - 8)
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return;
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if(color == 0 || color == 2)
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dst[row] &= ~(1UL << col);
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else
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dst[row] |= 1UL << col;
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if(color == 0 || color == 1)
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dst[row + 8] &= ~(1UL << col);
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else
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dst[row + 8] |= 1UL << col;
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}
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void
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loadtheme(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->colors[i] = (r << 20) + (r << 16) + (g << 12) + (g << 8) + (b << 4) + b;
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}
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p->reqdraw = 1;
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}
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