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GB: speed improvement by caching bank0

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Increases fps by up to 5.

Signed-off-by: Mahyar Koshkouei <mk@deltabeard.com>
This commit is contained in:
Mahyar Koshkouei
2022-04-02 12:11:26 +01:00
parent ab12b5a5d4
commit 87853543dc
1 changed files with 7 additions and 4 deletions
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src/main.c
+7 -4
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@@ -1,10 +1,8 @@
#define ENABLE_LCD 1 #define ENABLE_LCD 1
#define ENABLE_SOUND 1 #define ENABLE_SOUND 0
#define ENABLE_HIPASS 0 #define ENABLE_HIPASS 0
#define USE_DMA 0 #define USE_DMA 0
//#define AUDIO_SAMPLE_RATE 8000.0
//#define AUDIO_NSAMPLES 268
/** /**
* Reducing VSYNC calculation to lower multiple. * Reducing VSYNC calculation to lower multiple.
@@ -47,6 +45,7 @@
static uint dma_lcd; static uint dma_lcd;
extern const unsigned char rom[]; extern const unsigned char rom[];
unsigned char rom_bank0[16384];
static uint8_t ram[32768]; static uint8_t ram[32768];
static int lcd_line_busy = 0; static int lcd_line_busy = 0;
@@ -97,6 +96,9 @@ void mk_ili9225_delay_ms(unsigned ms)
uint8_t gb_rom_read(struct gb_s *gb, const uint_fast32_t addr) uint8_t gb_rom_read(struct gb_s *gb, const uint_fast32_t addr)
{ {
(void) gb; (void) gb;
if(addr < sizeof(rom_bank0))
return rom_bank0[addr];
return rom[addr]; return rom[addr];
} }
@@ -322,7 +324,8 @@ int main(void)
puts_raw("Launching Core 1"); puts_raw("Launching Core 1");
multicore_launch_core1(main_core1); multicore_launch_core1(main_core1);
/* Initialise context. */ /* Initialise GB context. */
memcpy(rom_bank0, rom, sizeof(rom_bank0));
ret = gb_init(&gb, &gb_rom_read, &gb_cart_ram_read, ret = gb_init(&gb, &gb_rom_read, &gb_cart_ram_read,
&gb_cart_ram_write, &gb_error, NULL); &gb_cart_ram_write, &gb_error, NULL);
puts_raw("GB INIT"); puts_raw("GB INIT");