48 lines
876 B
C
48 lines
876 B
C
/**
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* Copyright (c) 2016 rxi
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*
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* This library is free software; you can redistribute it and/or modify it
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* under the terms of the MIT license. See LICENSE for details.
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*/
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#include <assert.h>
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#include <stdlib.h>
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#include <string.h>
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#include <dos.h>
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#include <sys/movedata.h>
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#include "vga.h"
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int vga_inited = 0;
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void vga_init(void) {
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if (vga_inited) return;
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vga_inited = 1;
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union REGS regs = {};
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regs.h.al = 0x13;
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int86(0x10, ®s, ®s);
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}
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void vga_deinit(void) {
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if (!vga_inited) return;
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vga_inited = 0;
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union REGS regs = {};
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regs.h.al = 0x3;
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int86(0x10, ®s, ®s);
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}
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void vga_setPalette(int idx, int r, int g, int b) {
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outp(0x03c8, idx);
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outp(0x03c9, (r >> 2) & 0x3f);
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outp(0x03c9, (g >> 2) & 0x3f);
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outp(0x03c9, (b >> 2) & 0x3f);
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}
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void vga_update(pixel_t *buffer) {
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dosmemput(buffer, VGA_WIDTH * VGA_HEIGHT, 0xa0000);
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}
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