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Add code to mark which addresses are updated
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@ -4,6 +4,8 @@
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#include "apple2.h"
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#include "vm_bits.h"
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extern int apple2_hires_update(size_t, int);
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extern int apple2_hires_updated(size_t);
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extern void apple2_hires_draw(apple2 *, int);
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extern void apple2_hires_dump(apple2 *, FILE *);
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@ -10,6 +10,7 @@
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#include "apple2.dbuf.h"
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#include "apple2.draw.h"
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#include "apple2.hires.h"
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#include "vm_reflect.h"
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static size_t switch_reads[] = {
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@ -83,20 +84,24 @@ SEGMENT_READER(apple2_dbuf_read)
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SEGMENT_WRITER(apple2_dbuf_write)
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{
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apple2 *mach = (apple2 *)_mach;
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bool is_lores = (addr >= 0x400 && addr < 0x800);
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bool is_hires =
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(addr >= 0x2000 && addr < 0x4000) &&
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(mach->memory_mode & MEMORY_HIRES);
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bool is_page2 = (mach->memory_mode & MEMORY_PAGE2);
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if (mach->memory_mode & MEMORY_80STORE) {
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if (addr >= 0x400 && addr < 0x800 &&
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(mach->memory_mode & MEMORY_PAGE2)
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) {
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if (is_lores && is_page2) {
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segment = mach->aux;
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} else if (addr >= 0x2000 && addr < 0x4000 &&
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(mach->memory_mode & MEMORY_PAGE2) &&
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(mach->memory_mode & MEMORY_HIRES)
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) {
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} else if (is_hires && is_page2) {
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segment = mach->aux;
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}
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}
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if (is_hires) {
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apple2_hires_update(addr, 1);
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}
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// Again, segment is allowed to be that which was passed in if
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// 80STORE is low.
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segment->memory[addr] = value;
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@ -62,6 +62,12 @@ static int addresses[] = {
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0x23D0, 0x27D0, 0x2BD0, 0x2FD0, 0x33D0, 0x37D0, 0x3BD0, 0x3FD0, // 184-191
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};
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/*
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* This table indicates whether an address needs to be updated
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* (updated[i] == 1) or not (updated[i] == 0).
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*/
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static int updated[0x2000];
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#if 0
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/*
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* This table maps an address (across the entire hires graphics buffer
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@ -619,6 +625,30 @@ static vm_color colors[] = {
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{ 0xff, 0xff, 0xff, 0x00 }, // white
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};
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/*
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* Mark the given address as one that requires an update on the screen.
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*/
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int
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apple2_hires_update(size_t addr, int needed)
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{
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if (addr < 0x2000 || addr >= 0x4000) {
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return ERR_INVALID;
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}
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updated[addr - 0x2000] = needed;
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return OK;
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}
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int
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apple2_hires_updated(size_t addr)
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{
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if (addr < 0x2000 || addr >= 0x4000) {
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return 0;
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}
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return updated[addr - 0x2000];
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}
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/*
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* Draw a single row of hires graphics.
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*/
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@ -637,11 +667,19 @@ apple2_hires_draw(apple2 *mach, int row)
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for (int i = 0; i < 40; i++) {
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vm_8bit byte = mos6502_get(mach->cpu, addr + i);
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vm_8bit is_updated = apple2_hires_updated(addr + i);
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for (int pos = 0; pos < 7; pos++) {
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dots[(i * 7) + pos] =
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vm_8bit dotval =
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(is_updated ? 4 : 0) |
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((byte & 0x80) ? 2 : 0) |
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((byte >> pos) & 1);
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dots[(i * 7) + pos] = dotval;
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}
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if (is_updated) {
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apple2_hires_update(addr + i, 0);
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}
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}
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@ -650,6 +688,10 @@ apple2_hires_draw(apple2 *mach, int row)
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curr = 0;
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for (int i = 0; i < 279; i++) {
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if (dots[i] & 4) {
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continue;
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}
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curr = dots[i] & 1;
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next = dots[i+1] & 1;
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