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https://github.com/sehugg/8bitworkshop.git
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90 lines
3.3 KiB
C
90 lines
3.3 KiB
C
/*
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This example demonstrates setting up a ANTIC display list in C.
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We have two lines of text on the top, two lines on the bottom,
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and a bitmap in the middle.
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*/
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#include <peekpoke.h>
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#include <atari.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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// shadow registers for the 5200
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// TODO: use OS struct
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#define SDLIST (*(unsigned int*) 0x230) // Display list start shadow
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#define SDMCTL (*(unsigned char*)0x22f) // Antic DMA control shadow
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// screen RAM structure definition
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typedef struct ScreenMemoryDef {
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char topStatusLine[2][40];
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char bottomStatusLine[4][40];
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char bitmap[80][40];
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} ScreenMemoryDef;
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// screen RAM variable
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ScreenMemoryDef screen;
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// display list definition
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const void displayList = {
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DL_BLK8, // 8 blank scanlines
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DL_BLK8, // 8 blank scanlines
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// top status line (2 lines)
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DL_LMS(DL_CHR40x8x1), //Load Memory Scan (next two bytes must be the LSB/MSB of the data to load)
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screen.topStatusLine, // address of frame buffer
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DL_CHR40x10x1, // second line of text
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// 80x2 lines of 160x2x4 bitmap
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DL_LMS(DL_MAP160x2x4), // first line of bitmap
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screen.bitmap, // bitmap address
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DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
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DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
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DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
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DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
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DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
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DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
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DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
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DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
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DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
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DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
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DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
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DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
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DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
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DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
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DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
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DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
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DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
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DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
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DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
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DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4, DL_MAP160x2x4,
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// bottom status line (4 lines)
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DL_LMS(DL_CHR40x8x1), //Load Memory Scan (next two bytes must be the LSB/MSB of the data to load)
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screen.bottomStatusLine,
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DL_CHR40x8x1, DL_CHR40x8x1, DL_CHR40x8x1, // next 3 lines of text
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// wait for vertical blank
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DL_JVB,
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// restart display list
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DL_JMP,
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&displayList
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};
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void main(void) {
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unsigned int i;
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SDMCTL = 0; // turn off ANTIC
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SDLIST = (unsigned int) &displayList; // set display list
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SDMCTL = 0x22; // turn on ANTIC
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// set screen memory
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for(i=0; i<40; ++i) {
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screen.topStatusLine[0][i] = i;
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screen.topStatusLine[1][i] = i>>1;
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screen.bottomStatusLine[0][i] = i;
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screen.bottomStatusLine[1][i] = i>>1;
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screen.bottomStatusLine[2][i] = i<<1;
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screen.bottomStatusLine[3][i] = i<<2;
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}
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memset(screen.bitmap, 0x13, sizeof(screen.bitmap));
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// infinite loop
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while(1) {
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}
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}
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