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Get rid of the FIFO pause flags

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This commit is contained in:
Lior Halphon 2020-02-28 22:36:51 +02:00
parent e29246fd91
commit 955860b463
2 changed files with 13 additions and 19 deletions
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16
Core/display.c
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@ -422,20 +422,21 @@ static void render_pixel_if_possible(GB_gameboy_t *gb)
bool draw_oam = false;
bool bg_enabled = true, bg_priority = false;
if (!gb->bg_fifo_paused) {
if (fifo_size(&gb->bg_fifo)) {
fifo_item = fifo_pop(&gb->bg_fifo);
bg_priority = fifo_item->bg_priority;
}
if (!gb->oam_fifo_paused && fifo_size(&gb->oam_fifo)) {
if (fifo_size(&gb->oam_fifo)) {
oam_fifo_item = fifo_pop(&gb->oam_fifo);
if (oam_fifo_item->pixel && (gb->io_registers[GB_IO_LCDC] & 2)) {
draw_oam = true;
bg_priority |= oam_fifo_item->bg_priority;
}
}
}
if (gb->bg_fifo_paused) return;
if (!fifo_item) return;
/* Drop pixels for scrollings */
if (gb->position_in_line >= 160 || (gb->disable_rendering && !gb->sgb)) {
@ -658,7 +659,6 @@ static void advance_fetcher_state_machine(GB_gameboy_t *gb)
gb->fetcher_state++;
// fallthrough
case GB_FETCHER_PUSH: {
if (fifo_size(&gb->bg_fifo) > 0) break;
@ -673,8 +673,6 @@ static void advance_fetcher_state_machine(GB_gameboy_t *gb)
fifo_push_bg_row(&gb->bg_fifo, gb->current_tile_data[0], gb->current_tile_data[1],
gb->current_tile_attributes & 7, gb->current_tile_attributes & 0x80, gb->current_tile_attributes & 0x20);
gb->bg_fifo_paused = false;
gb->oam_fifo_paused = false;
gb->fetcher_state = 0;
}
break;
@ -946,8 +944,6 @@ void GB_display_run(GB_gameboy_t *gb, uint8_t cycles)
/* The actual rendering cycle */
gb->fetcher_state = 0;
gb->bg_fifo_paused = false;
gb->oam_fifo_paused = false;
while (true) {
/* Handle window */
/* Todo: verify timings */
@ -962,8 +958,6 @@ void GB_display_run(GB_gameboy_t *gb, uint8_t cycles)
gb->wx_triggered = true;
gb->window_tile_x = 0;
fifo_clear(&gb->bg_fifo);
gb->bg_fifo_paused = true;
gb->oam_fifo_paused = true;
gb->fetcher_state = 0;
window_got_activated = true;
}

6
Core/gb.h
View File

@ -489,7 +489,7 @@ struct GB_gameboy_internal_s {
bool vram_read_blocked;
bool oam_write_blocked;
bool vram_write_blocked;
GB_PADDING(bool, window_disabled_while_active);
bool fifo_insertion_glitch;
uint8_t current_line;
uint16_t ly_for_comparison;
GB_fifo_t bg_fifo, oam_fifo;
@ -500,8 +500,8 @@ struct GB_gameboy_internal_s {
uint8_t current_tile_attributes;
uint8_t current_tile_data[2];
uint8_t fetcher_state;
bool bg_fifo_paused;
bool oam_fifo_paused;
GB_PADDING(bool,bg_fifo_paused);
GB_PADDING(bool,oam_fifo_paused);
bool wx_triggered;
uint8_t visible_objs[10];
uint8_t obj_comparators[10];