74 lines
1.4 KiB
Go
74 lines
1.4 KiB
Go
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package apple2
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import (
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"bufio"
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"fmt"
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"os"
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)
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/*
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See:
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hhttps://mirrors.apple2.org.za/Apple%20II%20Documentation%20Project/Companies/Apple/Documentation/Apple%20Technical%20Information%20Library/a2til041.txt
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*/
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// CharacterGenerator represents the ROM wth the characters bitmaps
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type CharacterGenerator struct {
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data []uint8
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}
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const (
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rev7CharGenSize = 2048
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)
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// NewCharacterGenerator instantiates a new Character Generator with the rom on the file given
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func NewCharacterGenerator(filename string) *CharacterGenerator {
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var cg CharacterGenerator
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cg.load(filename)
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return &cg
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}
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func (cg *CharacterGenerator) load(filename string) {
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f, err := os.Open(filename)
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if err != nil {
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panic(err)
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}
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defer f.Close()
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stats, statsErr := f.Stat()
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if statsErr != nil {
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panic(err)
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}
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size := stats.Size()
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if size != rev7CharGenSize {
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panic("Character ROM size not supported")
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}
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cg.data = make([]uint8, size)
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buf := bufio.NewReader(f)
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buf.Read(cg.data)
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}
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func (cg *CharacterGenerator) dumpChar(char uint8) {
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base := int(char) * 8
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fmt.Printf("Char: %v\n---------\n", char)
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for i := 0; i < 8; i++ {
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fmt.Print("|")
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b := cg.data[base+i]
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for j := 6; j >= 0; j-- {
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if (b>>uint(j))&1 == 1 {
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fmt.Print("#")
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} else {
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fmt.Print(" ")
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}
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}
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fmt.Println("|")
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}
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fmt.Println("---------")
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}
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func (cg *CharacterGenerator) Dump() {
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for i := 0; i < 256; i++ {
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cg.dumpChar(uint8(i))
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}
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}
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