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analog-firmware
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Live palette editing

This commit is contained in:
David Kuder 2023-05-02 19:28:08 -04:00
parent 4871a12993
commit 9469594990
1 changed files with 59 additions and 0 deletions
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59
vga/businterface.c
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@ -4,6 +4,18 @@
#include "common/abus.h"
#include "vga/businterface.h"
#include "vga/vgabuf.h"
#include "vga/render.h"
uint8_t lores_to_dhgr[16] = {
0x0, 0x8,
0x1, 0x9,
0x2, 0xA,
0x3, 0xB,
0x4, 0xC,
0x5, 0xD,
0x6, 0xE,
0x7, 0xF
};
volatile uint8_t *terminal_page = terminal_memory;
@ -240,6 +252,8 @@ void __time_critical_func(vga_businterface)(uint32_t address, uint32_t value) {
// Card Registers
if(ACCESS_WRITE) {
if(CARD_SELECT && CARD_DEVSEL) {
uint8_t color_index;
cardslot = (address >> 4) & 0x7;
switch(address & 0x0F) {
case 0x01:
@ -280,6 +294,51 @@ void __time_critical_func(vga_businterface)(uint32_t address, uint32_t value) {
romx_changed = 1;
}
break;
case 0x0C:
apple_memory[address] = value;
break;
case 0x0D:
color_index = (apple_memory[address-1] >> 4) & 0xF;
#ifdef ANALOG_GS
switch(apple_memory[address-1] & 3) {
case 1:
lores_palette[color_index] =
(lores_palette[color_index] & 0x00FF) |
(((uint16_t)(value & 0xF)) << 8);
break;
case 2:
lores_palette[color_index] =
(lores_palette[color_index] & 0x0F0F) |
(((uint16_t)(value & 0xF)) << 4);
break;
case 3:
lores_palette[color_index] =
(lores_palette[color_index] & 0x0FF0) |
(((uint16_t)(value & 0xF)) << 0);
break;
}
#else
switch(apple_memory[address-1] & 3) {
case 1:
lores_palette[color_index] =
(lores_palette[color_index] & 0x003F) |
(((uint16_t)(value & 0x7)) << 6);
break;
case 2:
lores_palette[color_index] =
(lores_palette[color_index] & 0x01C7) |
(((uint16_t)(value & 0x7)) << 3);
break;
case 3:
lores_palette[color_index] =
(lores_palette[color_index] & 0x01F8) |
(((uint16_t)(value & 0x7)) << 0);
break;
}
#endif
dhgr_palette[lores_to_dhgr[color_index]] = lores_palette[color_index];
apple_memory[address] = value;
break;
}
}
} else if(CARD_SELECT && CARD_DEVSEL) {