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Copy only modified lines to LCD

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Results in speedup of 65 fps to 80 fps in some cases where the screen
does not change often between frames.

Signed-off-by: Mahyar Koshkouei <mk@deltabeard.com>
This commit is contained in:
Mahyar Koshkouei
2022-05-22 23:31:30 +01:00
parent 08cefc2122
commit 97360886ef
1 changed files with 49 additions and 4 deletions
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src/main.c
+49 -4
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@@ -97,6 +97,12 @@ union core_cmd {
uint32_t full;
};
struct gb_priv {
uint32_t lcd_line_hashes[LCD_HEIGHT];
uint dma_pixel_buffer_chan;
};
static struct gb_priv gb_priv = { 0 };
/* Pixel data is stored in here. */
static uint8_t pixels_buffer[LCD_WIDTH];
@@ -274,6 +280,7 @@ void main_core1(void)
// Sleep used for debugging LCD window.
//sleep_ms(1000);
/* Handle commands coming from core0. */
while(1)
{
cmd.full = multicore_fifo_pop_blocking();
@@ -296,6 +303,7 @@ void main_core1(void)
HEDLEY_UNREACHABLE();
}
#if ENABLE_LCD
void lcd_draw_line(struct gb_s *gb, const uint8_t pixels[LCD_WIDTH],
const uint_fast8_t line)
{
@@ -305,14 +313,26 @@ void lcd_draw_line(struct gb_s *gb, const uint8_t pixels[LCD_WIDTH],
while(__atomic_load_n(&lcd_line_busy, __ATOMIC_SEQ_CST))
tight_loop_contents();
//memcpy(pixels_buffer, pixels, LCD_WIDTH);
dma_hw->sniff_data = 0;
//line_to_copy = line;
dma_channel_set_read_addr(gb_priv.dma_pixel_buffer_chan, pixels, false);
dma_channel_set_write_addr(gb_priv.dma_pixel_buffer_chan, pixels_buffer, true);
dma_channel_wait_for_finish_blocking(gb_priv.dma_pixel_buffer_chan);
if(gb_priv.lcd_line_hashes[line] == dma_hw->sniff_data)
return;
gb_priv.lcd_line_hashes[line] = dma_hw->sniff_data;
/* Populate command. */
cmd.cmd = CORE_CMD_LCD_LINE;
cmd.data = line;
__atomic_store_n(&lcd_line_busy, 1, __ATOMIC_SEQ_CST);
memcpy(pixels_buffer, pixels, LCD_WIDTH);
multicore_fifo_push_blocking(cmd.full);
}
#endif
int main(void)
{
@@ -354,18 +374,17 @@ int main(void)
clock_configure(clk_peri, 0,
CLOCKS_CLK_PERI_CTRL_AUXSRC_VALUE_CLK_SYS,
125 * 1000 * 1000, 125 * 1000 * 1000);
spi_init(spi0, 32*1000*1000);
spi_init(spi0, 16*1000*1000);
spi_set_format(spi0, 16, SPI_CPOL_0, SPI_CPHA_0, SPI_MSB_FIRST);
/* Start Core1, which processes requests to the LCD. */
//puts_raw("Launching Core 1");
putstdio("CORE1 ");
multicore_launch_core1(main_core1);
/* Initialise GB context. */
memcpy(rom_bank0, rom, sizeof(rom_bank0));
ret = gb_init(&gb, &gb_rom_read, &gb_cart_ram_read,
&gb_cart_ram_write, &gb_error, NULL);
&gb_cart_ram_write, &gb_error, &gb_priv);
putstdio("GB ");
if(ret != GB_INIT_NO_ERROR)
@@ -376,6 +395,32 @@ int main(void)
#if ENABLE_LCD
gb_init_lcd(&gb, &lcd_draw_line);
{
/* initialise pixel buffer copy DMA. */
static dma_channel_config dma_config;
gb_priv.dma_pixel_buffer_chan = dma_claim_unused_channel(true);
dma_config = dma_channel_get_default_config(gb_priv.dma_pixel_buffer_chan);
channel_config_set_transfer_data_size(&dma_config, DMA_SIZE_32);
channel_config_set_read_increment(&dma_config, true);
channel_config_set_write_increment(&dma_config, true);
dma_sniffer_enable(gb_priv.dma_pixel_buffer_chan, 0x0, true);
channel_config_set_sniff_enable(&dma_config, true);
#if 0
irq_set_exclusive_handler(DMA_IRQ_1, core0_irq_dma_lcd_line_copy);
dma_channel_set_irq1_enabled(gb_priv.dma_pixel_buffer_chan, true);
irq_set_enabled(DMA_IRQ_1, true);
#endif
dma_channel_configure(
gb_priv.dma_pixel_buffer_chan,
&dma_config,
pixels_buffer,
0, /* We don't have a pointer to the pixel buffer here. */
LCD_WIDTH/sizeof(uint32_t),
false
);
}
putstdio("LCD ");
//gb.direct.interlace = 1;
#endif