mirror of
https://github.com/vivier/EMILE.git
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523 lines
8.7 KiB
C
523 lines
8.7 KiB
C
/*
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*
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* (c) 2004 Laurent Vivier <Laurent@lvivier.info>
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*
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*/
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#include <stdio.h>
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#include <macos/lowmem.h>
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#include <macos/quickdraw.h>
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#include <libmacos.h>
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#include "vga.h"
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QDGlobals qd;
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typedef struct vga_handler {
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unsigned char* video;
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unsigned char* base;
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unsigned long row_bytes; /* in bytes */
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unsigned long depth; /* 4, 8, 16 or 32 */
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unsigned long width; /* in pixels */
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unsigned long height;
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unsigned long siz_w, siz_h;
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unsigned long pos_x, pos_y;
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} vga_handler_t ;
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static unsigned char bits_depth2[16] = {
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0x00, /* 0 : 0000 -> 00000000 */
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0x03, /* 1 : 0001 -> 00000011 */
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0x0c, /* 2 : 0010 -> 00001100 */
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0x0f, /* 3 : 0011 -> 00001111 */
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0x30, /* 4 : 0100 -> 00110000 */
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0x33, /* 5 : 0101 -> 00110011 */
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0x3c, /* 6 : 0110 -> 00111100 */
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0x3f, /* 7 : 0111 -> 00111111 */
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0xc0, /* 8 : 1000 -> 11000000 */
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0xc3, /* 9 : 1001 -> 11000011 */
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0xcc, /* 10 : 1010 -> 11001100 */
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0xcf, /* 11 : 1011 -> 11001111 */
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0xf0, /* 12 : 1100 -> 11110000 */
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0xf3, /* 13 : 1101 -> 11110011 */
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0xfc, /* 14 : 1110 -> 11111100 */
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0xff /* 15 : 1111 -> 11111111 */
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};
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static unsigned char bits_depth4[4] = {
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0x00, /* 0 : 00 -> 00000000 */
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0x0f, /* 1 : 01 -> 00001111 */
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0xf0, /* 2 : 10 -> 11110000 */
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0xFF /* 3 : 11 -> 11111111 */
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};
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static unsigned char bits_depth8[2] = {
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0x00, /* 0 : 0 -> 00000000 */
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0xff /* 0 : 1 -> 11111111 */
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};
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static vga_handler_t vga =
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{
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.video = 0,
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.base = 0,
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.row_bytes = 0,
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.depth = 0,
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.width = 0,
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.height = 0,
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.siz_w = 0,
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.siz_h = 0,
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.pos_x = 0,
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.pos_y = 0
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};
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static unsigned long cursor_save_x, cursor_save_y;
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#define CURSOR_POS 0
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#define CURSOR_HIGH 16
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static int cursor_on = 0;
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static int cursor_state = 0;
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extern unsigned char* font_get(int c);
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static void
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draw_cursor(void)
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{
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int l,w;
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unsigned char *base;
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unsigned long x_base;
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unsigned long y_base;
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y_base = vga.row_bytes * vga.pos_y * 16;
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x_base = vga.pos_x * vga.depth;
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base = vga.base + y_base + x_base;
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base += CURSOR_POS * vga.row_bytes;
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for (l = 0 ; l < CURSOR_HIGH ; l++)
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{
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for (w = 0; w < vga.depth; w++)
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base[w] ^= 0xFF;
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base += vga.row_bytes;
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}
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}
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static void vga_cursor(int state)
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{
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if (cursor_state != state)
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{
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draw_cursor();
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cursor_state = state;
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}
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}
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void vga_cursor_refresh(void)
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{
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if (!cursor_on)
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return;
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if (Ticks % 60 < 30)
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vga_cursor(0);
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else
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vga_cursor(1);
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}
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void vga_cursor_on(void)
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{
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cursor_on = 1;
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vga_cursor_refresh();
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}
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void vga_cursor_off(void)
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{
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cursor_on = 0;
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vga_cursor(0);
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}
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void vga_cursor_save(void)
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{
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cursor_save_x = vga.pos_x;
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cursor_save_y = vga.pos_y;
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}
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void vga_cursor_restore(void)
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{
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vga_cursor(0);
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vga.pos_x = cursor_save_x;
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vga.pos_y = cursor_save_y;
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vga_cursor(1);
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}
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static void
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draw_byte_1(unsigned char *glyph, unsigned char *base)
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{
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int l;
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for (l = 0 ; l < 16; l++)
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{
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*base = ~(*glyph++);
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base += vga.row_bytes;
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}
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}
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static void
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draw_byte_2(unsigned char *glyph, unsigned char *base)
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{
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int l;
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int bits;
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for (l = 0 ; l < 16; l++)
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{
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bits = ~(*glyph++);
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base[1] = bits_depth2[bits & 0x0F];
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bits = bits >> 4;
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base[0] = bits_depth2[bits & 0x0F];
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base += vga.row_bytes;
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}
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}
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static void
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draw_byte_4(unsigned char *glyph, unsigned char *base)
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{
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int l;
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int bits;
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for (l = 0 ; l < 16; l++)
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{
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bits = ~(*glyph++);
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base[3] = bits_depth4[bits & 0x03];
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bits = bits >> 2;
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base[2] = bits_depth4[bits & 0x03];
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bits = bits >> 2;
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base[1] = bits_depth4[bits & 0x03];
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bits = bits >> 2;
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base[0] = bits_depth4[bits & 0x03];
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base += vga.row_bytes;
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}
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}
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static void
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draw_byte_8(unsigned char *glyph, unsigned char *base)
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{
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int l;
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int bits;
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for (l = 0 ; l < 16; l++)
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{
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bits = ~(*glyph++);
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base[7] = bits_depth8[bits & 0x01];
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bits = bits >> 1;
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base[6] = bits_depth8[bits & 0x01];
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bits = bits >> 1;
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base[5] = bits_depth8[bits & 0x01];
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bits = bits >> 1;
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base[4] = bits_depth8[bits & 0x01];
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bits = bits >> 1;
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base[3] = bits_depth8[bits & 0x01];
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bits = bits >> 1;
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base[2] = bits_depth8[bits & 0x01];
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bits = bits >> 1;
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base[1] = bits_depth8[bits & 0x01];
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bits = bits >> 1;
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base[0] = bits_depth8[bits & 0x01];
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base += vga.row_bytes;
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}
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}
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static void
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draw_byte_16(unsigned char *glyph, unsigned char *base)
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{
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int l;
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int bits;
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for (l = 0 ; l < 16; l++)
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{
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bits = *glyph++;
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base[15] = base[14] = bits_depth8[bits & 0x01];
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bits = bits >> 1;
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base[13] = base[12] = bits_depth8[bits & 0x01];
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bits = bits >> 1;
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base[11] = base[10] = bits_depth8[bits & 0x01];
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bits = bits >> 1;
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base[9] = base[8] = bits_depth8[bits & 0x01];
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bits = bits >> 1;
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base[7] = base[6] = bits_depth8[bits & 0x01];
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bits = bits >> 1;
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base[5] = base[4] = bits_depth8[bits & 0x01];
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bits = bits >> 1;
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base[3] = base[2] = bits_depth8[bits & 0x01];
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bits = bits >> 1;
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base[1] = base[0] = bits_depth8[bits & 0x01];
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base += vga.row_bytes;
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}
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}
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static void
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draw_byte_24(unsigned char *glyph, unsigned char *base)
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{
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int l;
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int bits;
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for (l = 0 ; l < 16; l++)
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{
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bits = *glyph++;
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base[23] = base[22] = base[21] = bits_depth8[bits & 0x01];
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bits = bits >> 1;
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base[20] = base[19] = base[18] = bits_depth8[bits & 0x01];
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bits = bits >> 1;
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base[17] = base[16] = base[15] = bits_depth8[bits & 0x01];
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bits = bits >> 1;
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base[14] = base[13] = base[12] = bits_depth8[bits & 0x01];
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bits = bits >> 1;
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base[11] = base[10] = base[9] = bits_depth8[bits & 0x01];
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bits = bits >> 1;
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base[8] = base[7] = base[6] = bits_depth8[bits & 0x01];
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bits = bits >> 1;
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base[5] = base[4] = base[3] = bits_depth8[bits & 0x01];
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bits = bits >> 1;
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base[2] = base[1] = base[0] = bits_depth8[bits & 0x01];
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base += vga.row_bytes;
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}
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}
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static void
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draw_byte(unsigned char c, unsigned long locX, unsigned long locY)
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{
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unsigned char *base;
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unsigned char *glyph;
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unsigned long x_base;
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unsigned long y_base;
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glyph = font_get(c);
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y_base = vga.row_bytes * locY * 16;
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x_base = locX * vga.depth;
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base = vga.base + y_base + x_base;
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switch(vga.depth)
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{
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case 1:
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draw_byte_1(glyph, base);
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break;
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case 2:
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draw_byte_2(glyph, base);
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break;
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case 4:
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draw_byte_4(glyph, base);
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break;
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case 8:
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draw_byte_8(glyph, base);
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break;
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case 16:
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draw_byte_16(glyph, base);
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break;
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case 24:
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draw_byte_24(glyph, base);
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break;
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}
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}
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static void vga_clear();
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static void
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vga_scroll()
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{
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unsigned long j;
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unsigned long i;
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unsigned long *src;
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unsigned long *dst;
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unsigned long bg32;
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/* move up the screen */
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src = (unsigned long *)(vga.base + (vga.row_bytes << 4));
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dst = (unsigned long *)vga.base;
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for (j = 0; j < vga.siz_h - 1; j++)
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for (i = 0; i < (vga.row_bytes<<2); i++)
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*dst++ = *src++;
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/* clear last line */
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if (vga.depth <= 8)
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bg32 = 0xffffffff;
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else
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bg32 = 0x00000000;
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for (j = 0; j < (vga.row_bytes << 2); j++)
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*dst++ = bg32;
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}
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int
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vga_init()
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{
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int ret;
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InitGraf(&qd.thePort);
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ret = glue_display_properties((unsigned long*)&vga.base,
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&vga.row_bytes,
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&vga.width,
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&vga.height,
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&vga.depth,
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(unsigned long*)&vga.video);
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if (ret)
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{
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vga.base = qd.screenBits.baseAddr;
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vga.row_bytes = qd.screenBits.rowBytes;
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vga.width = qd.screenBits.bounds.right -
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qd.screenBits.bounds.left;
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vga.height = qd.screenBits.bounds.bottom -
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qd.screenBits.bounds.top;
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vga.depth = 1;
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}
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vga.pos_x = 0;
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vga.pos_y = 0;
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vga.siz_w = vga.width / 8;
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vga.siz_h = vga.height / 16;
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vga_clear();
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return 0;
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}
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void
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vga_put(char c)
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{
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vga_cursor(0);
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switch(c) {
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case '\r':
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vga.pos_x = 0;
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break;
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case '\n':
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vga.pos_x = 0;
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vga.pos_y++;
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break;
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case '\b':
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if (vga.pos_x > 0)
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vga.pos_x--;
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else if (vga.pos_y > 0)
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{
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vga.pos_y--;
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vga.pos_x = vga.siz_w - 1;
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}
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break;
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default:
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draw_byte((unsigned char)c, vga.pos_x++, vga.pos_y);
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if (vga.pos_x >= vga.siz_w) {
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vga.pos_x = 0;
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vga.pos_y++;
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}
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}
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while (vga.pos_y >= vga.siz_h) {
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vga_scroll();
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vga.pos_y--;
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}
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vga_cursor_refresh();
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}
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static void
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vga_clear()
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{
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int i,j;
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unsigned long row;
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unsigned char bg;
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unsigned long bg32;
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unsigned long *base;
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unsigned char *next;
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vga_cursor(0);
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if (vga.depth <= 8)
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{
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bg = 0xff;
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bg32 = 0xffffffff;
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}
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else
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{
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bg = 0x00;
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bg32 = 0x00000000;
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}
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for (j = 0, row = 0; j < vga.height; j++)
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{
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base = (unsigned long*)(vga.base + row);
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row += vga.row_bytes;
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for (i = 0; i < (vga.row_bytes >> 2); i++)
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*base++ = bg32;
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next = (unsigned char*)base;
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for (i = i << 2 ; i < vga.row_bytes; i++)
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*next++ = bg;
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}
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vga.pos_x = 0;
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vga.pos_y = 0;
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vga_cursor_refresh();
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}
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unsigned long vga_get_videobase()
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{
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return (unsigned long)vga.base;
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}
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unsigned long vga_get_row_bytes()
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{
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return vga.row_bytes;
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}
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unsigned long vga_get_depth()
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{
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return vga.depth;
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}
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unsigned long vga_get_width()
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{
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return vga.width;
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}
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unsigned long vga_get_height()
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{
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return vga.height;
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}
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unsigned long vga_get_video()
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{
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return (unsigned long)vga.video;
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}
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