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Add code to mark which addresses are updated

This commit is contained in:
Peter Evans 2018-03-31 22:44:21 -05:00
parent 2d0952133a
commit 146bd42cfe
3 changed files with 57 additions and 8 deletions

View File

@ -4,6 +4,8 @@
#include "apple2.h"
#include "vm_bits.h"
extern int apple2_hires_update(size_t, int);
extern int apple2_hires_updated(size_t);
extern void apple2_hires_draw(apple2 *, int);
extern void apple2_hires_dump(apple2 *, FILE *);

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@ -10,6 +10,7 @@
#include "apple2.dbuf.h"
#include "apple2.draw.h"
#include "apple2.hires.h"
#include "vm_reflect.h"
static size_t switch_reads[] = {
@ -83,20 +84,24 @@ SEGMENT_READER(apple2_dbuf_read)
SEGMENT_WRITER(apple2_dbuf_write)
{
apple2 *mach = (apple2 *)_mach;
bool is_lores = (addr >= 0x400 && addr < 0x800);
bool is_hires =
(addr >= 0x2000 && addr < 0x4000) &&
(mach->memory_mode & MEMORY_HIRES);
bool is_page2 = (mach->memory_mode & MEMORY_PAGE2);
if (mach->memory_mode & MEMORY_80STORE) {
if (addr >= 0x400 && addr < 0x800 &&
(mach->memory_mode & MEMORY_PAGE2)
) {
if (is_lores && is_page2) {
segment = mach->aux;
} else if (addr >= 0x2000 && addr < 0x4000 &&
(mach->memory_mode & MEMORY_PAGE2) &&
(mach->memory_mode & MEMORY_HIRES)
) {
} else if (is_hires && is_page2) {
segment = mach->aux;
}
}
if (is_hires) {
apple2_hires_update(addr, 1);
}
// Again, segment is allowed to be that which was passed in if
// 80STORE is low.
segment->memory[addr] = value;

View File

@ -62,6 +62,12 @@ static int addresses[] = {
0x23D0, 0x27D0, 0x2BD0, 0x2FD0, 0x33D0, 0x37D0, 0x3BD0, 0x3FD0, // 184-191
};
/*
* This table indicates whether an address needs to be updated
* (updated[i] == 1) or not (updated[i] == 0).
*/
static int updated[0x2000];
#if 0
/*
* This table maps an address (across the entire hires graphics buffer
@ -619,6 +625,30 @@ static vm_color colors[] = {
{ 0xff, 0xff, 0xff, 0x00 }, // white
};
/*
* Mark the given address as one that requires an update on the screen.
*/
int
apple2_hires_update(size_t addr, int needed)
{
if (addr < 0x2000 || addr >= 0x4000) {
return ERR_INVALID;
}
updated[addr - 0x2000] = needed;
return OK;
}
int
apple2_hires_updated(size_t addr)
{
if (addr < 0x2000 || addr >= 0x4000) {
return 0;
}
return updated[addr - 0x2000];
}
/*
* Draw a single row of hires graphics.
*/
@ -637,11 +667,19 @@ apple2_hires_draw(apple2 *mach, int row)
for (int i = 0; i < 40; i++) {
vm_8bit byte = mos6502_get(mach->cpu, addr + i);
vm_8bit is_updated = apple2_hires_updated(addr + i);
for (int pos = 0; pos < 7; pos++) {
dots[(i * 7) + pos] =
vm_8bit dotval =
(is_updated ? 4 : 0) |
((byte & 0x80) ? 2 : 0) |
((byte >> pos) & 1);
dots[(i * 7) + pos] = dotval;
}
if (is_updated) {
apple2_hires_update(addr + i, 0);
}
}
@ -650,6 +688,10 @@ apple2_hires_draw(apple2 *mach, int row)
curr = 0;
for (int i = 0; i < 279; i++) {
if (dots[i] & 4) {
continue;
}
curr = dots[i] & 1;
next = dots[i+1] & 1;