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MASK_EN support

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This commit is contained in:
Lior Halphon 2018-11-16 12:42:52 +02:00
parent 2f2b792edf
commit 382d9f8898
3 changed files with 39 additions and 2 deletions
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1
Core/gb.c
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@ -648,6 +648,7 @@ void GB_reset(GB_gameboy_t *gb)
if (!gb->sgb) {
gb->sgb = malloc(sizeof(*gb->sgb));
}
memset(gb->sgb, 0, sizeof(*gb->sgb));
gb->sgb->player_count = 1;
}

33
Core/sgb.c
View File

@ -2,8 +2,16 @@
enum {
MLT_REQ = 0x11,
MASK_EN = 0x17,
};
typedef enum {
MASK_DISABLED,
MASK_FREEZE,
MASK_COLOR_3,
MASK_COLOR_0,
} mask_mode_t;
#define SGB_PACKET_SIZE 16
static void command_ready(GB_gameboy_t *gb)
@ -46,6 +54,9 @@ static void command_ready(GB_gameboy_t *gb)
gb->sgb->player_count = (uint8_t[]){1, 2, 1, 4}[gb->sgb->command[1] & 3];
gb->sgb->current_player = gb->sgb->player_count - 1;
break;
case MASK_EN:
gb->sgb->mask_mode = gb->sgb->command[1] & 3;
break;
default:
GB_log(gb, "Unimplemented SGB command %x: ", gb->sgb->command[0] >> 3);
for (unsigned i = 0; i < gb->sgb->command_write_index / 8; i++) {
@ -144,8 +155,28 @@ void GB_sgb_render(GB_gameboy_t *gb)
gb->screen[i] = border;
}
switch ((mask_mode_t) gb->sgb->mask_mode) {
case MASK_DISABLED:
memcpy(gb->sgb->effective_screen_buffer,
gb->sgb->screen_buffer,
sizeof(gb->sgb->effective_screen_buffer));
break;
case MASK_FREEZE:
break;
case MASK_COLOR_3:
memset(gb->sgb->effective_screen_buffer,
3,
sizeof(gb->sgb->effective_screen_buffer));
break;
case MASK_COLOR_0:
memset(gb->sgb->effective_screen_buffer,
0,
sizeof(gb->sgb->effective_screen_buffer));
}
uint32_t *output = &gb->screen[48 + 39 * 256];
uint8_t *input = gb->sgb->screen_buffer;
uint8_t *input = gb->sgb->effective_screen_buffer;
for (unsigned y = 0; y < 144; y++) {
for (unsigned x = 0; x < 160; x++) {
*(output++) = colors[*(input++) & 3];

7
Core/sgb.h
View File

@ -14,9 +14,14 @@ typedef struct {
bool disable_commands;
/* Screen buffer */
uint8_t screen_buffer[160 * 144];
uint8_t screen_buffer[160 * 144]; // Live image from the Game Boy
uint8_t effective_screen_buffer[160 * 144]; // Image actually rendered to the screen
/* Multiplayer Input */
uint8_t player_count, current_player;
/* Mask */
uint8_t mask_mode;
} GB_sgb_t;
void GB_sgb_write(GB_gameboy_t *gb, uint8_t value);