mirror of
https://github.com/sehugg/8bitworkshop.git
synced 2024-11-22 14:33:51 +00:00
96 lines
3.7 KiB
C
96 lines
3.7 KiB
C
/*
|
|
This example demonstrates setting up a ANTIC display list in C.
|
|
We have two lines of text on the top, two lines on the bottom,
|
|
and a bitmap in the middle.
|
|
*/
|
|
#include <peekpoke.h>
|
|
#include <atari5200.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
// shadow registers for the 5200
|
|
#define POKMSK (*(unsigned char*)0x00) // Mask for Pokey IRQ enable
|
|
#define RTCLOK (*(unsigned char*)0x01) // 60 hz. clock
|
|
#define CRITIC (*(unsigned char*)0x03) // critical section
|
|
#define ATRACT (*(unsigned char*)0x04) // attract mode
|
|
#define SDLIST (*(unsigned int*) 0x05) // Display list start shadow
|
|
#define SDMCTL (*(unsigned char*)0x07) // Antic DMA control shadow
|
|
#define PCOLOR ((unsigned char[4])0x08) // COLPM[0-3] shadow
|
|
#define COLORS ((unsigned char[5])0x0c) // COLOR[0-4] shadow
|
|
#define PADDLS ((unsigned char[8])0x11) // POT[0-7] shadow
|
|
|
|
// screen RAM structure definition
|
|
typedef struct ScreenMemoryDef {
|
|
char topStatusLine[2][40];
|
|
char bottomStatusLine[4][40];
|
|
char bitmap[80][40];
|
|
} ScreenMemoryDef;
|
|
|
|
// screen RAM variable
|
|
ScreenMemoryDef screen;
|
|
|
|
// display list definition
|
|
const void displayList = {
|
|
DL_BLK8, // 8 blank scanlines
|
|
DL_BLK8, // 8 blank scanlines
|
|
// top status line (2 lines)
|
|
DL_LMS(DL_CHR40x8x1), //Load Memory Scan (next two bytes must be the LSB/MSB of the data to load)
|
|
screen.topStatusLine, // address of frame buffer
|
|
DL_CHR40x10x1, // second line of text
|
|
// 80x2 lines of 160x2x4 bitmap
|
|
DL_LMS(DL_MAP160x2x4), // first line of bitmap
|
|
screen.bitmap, // bitmap address
|
|
DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
|
|
DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
|
|
DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
|
|
DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
|
|
DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
|
|
DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
|
|
DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
|
|
DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
|
|
DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
|
|
DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
|
|
DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
|
|
DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
|
|
DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
|
|
DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
|
|
DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
|
|
DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
|
|
DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
|
|
DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
|
|
DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
|
|
DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
|
|
// bottom status line (4 lines)
|
|
DL_LMS(DL_CHR40x8x1), //Load Memory Scan (next two bytes must be the LSB/MSB of the data to load)
|
|
screen.bottomStatusLine,
|
|
DL_CHR40x8x1, DL_CHR40x8x1, DL_CHR40x8x1, // next 3 lines of text
|
|
// wait for vertical blank
|
|
DL_JVB,
|
|
// restart display list
|
|
DL_JMP,
|
|
&displayList
|
|
};
|
|
|
|
void main(void) {
|
|
unsigned int i;
|
|
|
|
SDMCTL = 0; // turn off ANTIC
|
|
SDLIST = (unsigned int) &displayList; // set display list
|
|
SDMCTL = 0x22; // turn on ANTIC
|
|
|
|
// set screen memory
|
|
for(i=0; i<40; ++i) {
|
|
screen.topStatusLine[0][i] = i;
|
|
screen.topStatusLine[1][i] = i>>1;
|
|
screen.bottomStatusLine[0][i] = i;
|
|
screen.bottomStatusLine[1][i] = i>>1;
|
|
screen.bottomStatusLine[2][i] = i<<1;
|
|
screen.bottomStatusLine[3][i] = i<<2;
|
|
}
|
|
memset(screen.bitmap, 0x13, sizeof(screen.bitmap));
|
|
// infinite loop
|
|
while(1) {
|
|
}
|
|
}
|