optimization: Optimize VRAM accesses from within the gpu.
Not going through the memory mapping anymore. Also, this commit wraps the gpu pixeldata with a struct Former-commit-id: d7b706d9de61bac7909e10d6bbe092968e6acc9f
This commit is contained in:
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eb2a1a02fe
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9f0df9af06
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@ -1,3 +1,5 @@
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use std::fmt;
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use super::arm7tdmi::{Addr, Bus};
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use super::ioregs::consts::*;
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use super::palette::{Palette, PixelFormat, Rgb15};
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@ -146,9 +148,37 @@ impl Default for GpuState {
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}
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use GpuState::*;
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pub struct FrameBuffer([Rgb15; 512 * 512]);
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impl fmt::Debug for FrameBuffer {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "FrameBuffer: ")?;
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for i in 0..6 {
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let (r, g, b) = self.0[i].get_rgb24();
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write!(f, "#{:x}{:x}{:x}, ", r, g, b)?;
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}
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write!(f, "...")
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}
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}
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impl std::ops::Index<usize> for FrameBuffer {
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type Output = Rgb15;
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fn index(&self, index: usize) -> &Self::Output {
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&self.0[index]
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}
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}
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impl std::ops::IndexMut<usize> for FrameBuffer {
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fn index_mut(&mut self, index: usize) -> &mut Self::Output {
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&mut self.0[index]
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}
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}
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#[derive(Debug)]
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pub struct Gpu {
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cycles: usize,
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pub pixeldata: [Rgb15; 512 * 512],
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pub pixeldata: FrameBuffer,
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pub state: GpuState,
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pub current_scanline: usize, // VCOUNT
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}
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@ -171,7 +201,7 @@ impl Gpu {
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state: HDraw,
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current_scanline: 0,
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cycles: 0,
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pixeldata: [Rgb15::from(0); 512 * 512],
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pixeldata: FrameBuffer([Rgb15::from(0); 512 * 512]),
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}
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}
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@ -233,36 +263,37 @@ impl Gpu {
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/// helper method that reads the palette index from a base address and x + y
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pub fn read_pixel_index(
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&self,
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sysbus: &SysBus,
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sb: &SysBus,
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addr: Addr,
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x: u32,
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y: u32,
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format: PixelFormat,
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) -> usize {
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let ofs = addr - VRAM_ADDR;
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match format {
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PixelFormat::BPP4 => {
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let byte = sysbus.read_8(addr + index2d!(x / 2, y, 4));
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let byte = sb.vram.read_8(ofs + index2d!(x / 2, y, 4));
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if x & 1 != 0 {
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(byte >> 4) as usize
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} else {
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(byte & 0xf) as usize
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}
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}
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PixelFormat::BPP8 => sysbus.read_8(addr + index2d!(x, y, 8)) as usize,
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PixelFormat::BPP8 => sb.vram.read_8(ofs + index2d!(x, y, 8)) as usize,
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}
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}
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pub fn get_palette_color(&self, sysbus: &SysBus, index: u32, palette_index: u32) -> Rgb15 {
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sysbus
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.read_16(0x0500_0000 + 2 * index + 0x20 * palette_index)
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pub fn get_palette_color(&self, sb: &SysBus, index: u32, palette_index: u32) -> Rgb15 {
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sb.palette_ram
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.read_16(2 * index + 0x20 * palette_index)
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.into()
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}
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fn scanline_mode0(&mut self, bg: u32, sysbus: &mut SysBus) {
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let bgcnt = self.bgcnt(bg, sysbus);
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let (h_ofs, v_ofs) = self.bgofs(bg, sysbus);
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let tileset_base = bgcnt.char_block();
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let tilemap_base = bgcnt.screen_block();
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fn scanline_mode0(&mut self, bg: u32, sb: &mut SysBus) {
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let bgcnt = self.bgcnt(bg, sb);
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let (h_ofs, v_ofs) = self.bgofs(bg, sb);
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let tileset_base = bgcnt.char_block() - VRAM_ADDR;
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let tilemap_base = bgcnt.screen_block() - VRAM_ADDR;
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let (tile_size, pixel_format) = bgcnt.tile_format();
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let (bg_width, bg_height) = bgcnt.size_regular();
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@ -299,13 +330,13 @@ impl Gpu {
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let map_addr = tilemap_base
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+ SCREEN_BLOCK_SIZE * screen_block
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+ 2 * (index2d!((se_row + t) % 32, se_column, 32) as u32);
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let entry = TileMapEntry::from(sysbus.read_16(map_addr));
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let entry = TileMapEntry::from(sb.vram.read_16(map_addr - VRAM_ADDR));
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let tile_addr = tileset_base + entry.tile_index * tile_size;
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for tile_px in start_tile_x..=7 {
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let tile_py = (bg_y % 8) as u32;
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let index = self.read_pixel_index(
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sysbus,
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sb,
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tile_addr,
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if entry.x_flip { 7 - tile_px } else { tile_px },
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if entry.y_flip { 7 - tile_py } else { tile_py },
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@ -315,7 +346,7 @@ impl Gpu {
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PixelFormat::BPP4 => entry.palette_bank as u32,
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PixelFormat::BPP8 => 0u32,
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};
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let color = self.get_palette_color(sysbus, index as u32, palette_bank);
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let color = self.get_palette_color(sb, index as u32, palette_bank);
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if color.get_rgb24() != (0, 0, 0) {
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self.pixeldata[index2d!(screen_x as usize, screen_y as usize, 512)] = color;
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}
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@ -338,15 +369,15 @@ impl Gpu {
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for x in 0..Self::DISPLAY_WIDTH {
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let pixel_index = index2d!(x, y, Self::DISPLAY_WIDTH);
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let pixel_addr = 0x0600_0000 + 2 * (pixel_index as u32);
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self.pixeldata[index2d!(x, y, 512)] = sb.read_16(pixel_addr).into();
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let pixel_ofs = 2 * (pixel_index as u32);
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self.pixeldata[index2d!(x, y, 512)] = sb.vram.read_16(pixel_ofs).into();
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}
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}
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fn scanline_mode4(&mut self, bg: u32, dispcnt: &DisplayControl, sysbus: &mut SysBus) {
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let page: u32 = match dispcnt.display_frame {
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0 => 0x0600_0000,
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1 => 0x0600_a000,
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fn scanline_mode4(&mut self, bg: u32, dispcnt: &DisplayControl, sb: &mut SysBus) {
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let page_ofs: u32 = match dispcnt.display_frame {
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0 => 0x0600_0000 - VRAM_ADDR,
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1 => 0x0600_a000 - VRAM_ADDR,
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_ => unreachable!(),
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};
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@ -354,9 +385,9 @@ impl Gpu {
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for x in 0..Self::DISPLAY_WIDTH {
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let bitmap_index = index2d!(x, y, Self::DISPLAY_WIDTH);
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let bitmap_addr = page + (bitmap_index as u32);
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let index = sysbus.read_8(bitmap_addr as Addr) as u32;
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self.pixeldata[index2d!(x, y, 512)] = self.get_palette_color(sysbus, index, 0);
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let bitmap_ofs = page_ofs + (bitmap_index as u32);
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let index = sb.vram.read_8(bitmap_ofs as Addr) as u32;
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self.pixeldata[index2d!(x, y, 512)] = self.get_palette_color(sb, index, 0);
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}
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}
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@ -15,7 +15,7 @@ const OAM_SIZE: usize = 1 * 1024;
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#[derive(Debug)]
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pub struct BoxedMemory {
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mem: Box<[u8]>,
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pub mem: Box<[u8]>,
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ws: WaitState,
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mask: u32,
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}
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@ -155,9 +155,9 @@ pub struct SysBus {
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internal_work_ram: BoxedMemory,
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/// Currently model the IOMem as regular buffer, later make it into something more sophisticated.
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pub ioregs: IoRegs,
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palette_ram: BoxedMemory,
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vram: BoxedMemory,
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oam: BoxedMemory,
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pub palette_ram: BoxedMemory,
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pub vram: BoxedMemory,
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pub oam: BoxedMemory,
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gamepak: Cartridge,
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dummy: DummyBus,
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}
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