apple1-videocard-lib/tms_screen1.h

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2021-12-08 11:53:13 +00:00
byte SCREEN1_TABLE[8] = {
0x00, 0xc0, 0x05, 0x80, 0x01, 0x20, 0x00, 0x25
};
// SCREEN 1 VALUES
// sprite patterns: $0000
// pattern table: $0800 (256*8)
// sprite attributes: $1000
// unused: $1080
// name table: $1400 (32*24)
// unused: $1800
// color table: $2000 (32)
// unused $2020-$3FFF
const word SCREEN1_PATTERN_TABLE = 0x0800;
const word SCREEN1_NAME_TABLE = 0x1400;
const word SCREEN1_COLOR_TABLE = 0x2000;
const word SCREEN1_SPRITE_PATTERNS = 0x0000;
const word SCREEN1_SPRITE_ATTRS = 0x1000;
const word SCREEN1_SIZE = (32*24);
// loads the a font on the pattern table
void SCREEN1_LOAD_FONT() {
byte *source = FONT;
// start writing into VRAM from space character (32..127)
set_vram_write_addr(SCREEN1_PATTERN_TABLE+(32*8));
for(word i=768;i!=0;i--) {
TMS_WRITE_DATA_PORT(*source++);
}
// reverse font (32..127)
source = FONT;
set_vram_write_addr(SCREEN1_PATTERN_TABLE+((128+32)*8));
for(word i=768;i!=0;i--) {
TMS_WRITE_DATA_PORT(~(*source++));
}
}
// hold the cursor location for the putchar routine
word screen1_cursor;
// prints character to TMS (SCREEN 1 MODE)
void SCREEN1_PUTCHAR(byte c) {
set_vram_write_addr(screen1_cursor++);
TMS_WRITE_DATA_PORT(c);
}
// prints 0 terminated string pointed by YA
void SCREEN1_PUTS(byte *s) {
byte c;
while(c=*s++) {
SCREEN1_PUTCHAR(c);
}
}
void SCREEN1_HOME() {
screen1_cursor = SCREEN1_NAME_TABLE;
}
void SCREEN1_LOCATEXY(byte x, byte y) {
screen1_cursor = SCREEN1_NAME_TABLE + ((word)y)*32 + x;
}
void SCREEN1_FILL() {
// fills name table with spaces (32)
set_vram_write_addr(SCREEN1_NAME_TABLE);
for(word i=SCREEN1_SIZE;i!=0;i--) {
TMS_WRITE_DATA_PORT(32);
}
// fill pattern table with 0
set_vram_write_addr(SCREEN1_PATTERN_TABLE);
for(word i=256*8;i!=0;i--) {
TMS_WRITE_DATA_PORT(0);
}
// fill color table with black on white
set_vram_write_addr(SCREEN1_COLOR_TABLE);
for(byte i=32;i!=0;i--) {
TMS_WRITE_DATA_PORT(COLOR_BYTE(COLOR_BLACK,COLOR_WHITE));
}
}
void screen1_square_sprites() {
// fills first sprite pattern with 255
set_vram_write_addr(SCREEN1_SPRITE_PATTERNS); // start writing in the sprite patterns
for(byte i=0;i<8;i++) {
TMS_WRITE_DATA_PORT(255);
}
// set sprite coordinates
set_vram_write_addr(SCREEN1_SPRITE_ATTRS); // start writing in the sprite attribute
for(byte i=0;i<32;i++) {
TMS_WRITE_DATA_PORT((6+i)*8); NOP; NOP; NOP; NOP; // y coordinate
TMS_WRITE_DATA_PORT((6+i)*8); NOP; NOP; NOP; NOP; // x coordinate
TMS_WRITE_DATA_PORT(0); NOP; NOP; NOP; NOP; // name
TMS_WRITE_DATA_PORT(i); NOP; NOP; NOP; NOP; // color
}
}
void prova_screen1() {
TMS_INIT(SCREEN1_TABLE);
SCREEN1_FILL();
SCREEN1_LOAD_FONT();
SCREEN1_HOME(); SCREEN1_PUTS("*** P-LAB VIDEO CARD SYSTEM ***");
SCREEN1_LOCATEXY(0, 2); SCREEN1_PUTS("16K VRAM BYTES FREE");
SCREEN1_LOCATEXY(0, 4); SCREEN1_PUTS("READY.");
SCREEN1_LOCATEXY(0, 10);
for(word i=0;i<256;i++) SCREEN1_PUTCHAR((byte)i);
screen1_square_sprites();
}