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Implement Window special effect (win_demo.gba works, excpet the sprite)

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Former-commit-id: 511d04045bbb678ceec39e34c483f04db154997b
This commit is contained in:
Michel Heily 2019-08-24 00:36:48 +03:00
parent 1d2d950729
commit 8abebbe844
4 changed files with 291 additions and 97 deletions
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73
src/core/gpu/mod.rs
View file

@ -6,10 +6,10 @@ use super::*;
use crate::bitfield::Bit;
use crate::num::FromPrimitive;
mod blend;
mod mosaic;
mod sfx;
mod regs;
pub mod regs;
pub use regs::*;
pub const VRAM_ADDR: Addr = 0x0600_0000;
@ -164,6 +164,42 @@ pub struct Bg {
mosaic_first_row: Scanline,
}
#[derive(Debug, Default)]
pub struct Window {
pub left: u8,
pub right: u8,
pub top: u8,
pub bottom: u8,
pub flags: WindowFlags,
}
impl Window {
pub fn inside(&self, x: usize, y: usize) -> bool {
let left = self.left as usize;
let mut right = self.right as usize;
let top = self.top as usize;
let mut bottom = self.bottom as usize;
if right > DISPLAY_WIDTH || right < left {
right = DISPLAY_WIDTH;
}
if bottom > DISPLAY_HEIGHT || bottom < top {
bottom = DISPLAY_HEIGHT;
}
(x >= left && x < right) && (y >= top && y < bottom)
}
}
#[derive(Debug)]
pub enum WindowType {
Win0,
Win1,
WinObj,
WinOut,
WinNone,
}
#[derive(Debug, Default, Copy, Clone)]
pub struct BgAffine {
pub pa: i16, // dx
@ -176,29 +212,28 @@ pub struct BgAffine {
#[derive(Debug)]
pub struct Gpu {
pub state: GpuState,
cycles: usize,
// registers
pub current_scanline: usize, // VCOUNT
pub dispcnt: DisplayControl,
pub dispstat: DisplayStatus,
pub bg: [Bg; 4],
pub bg_aff: [BgAffine; 2],
pub win0h: u16,
pub win1h: u16,
pub win0v: u16,
pub win1v: u16,
pub winin: u16,
pub winout: u16,
pub win0: Window,
pub win1: Window,
pub winout_flags: WindowFlags,
pub winobj_flags: WindowFlags,
pub mosaic: RegMosaic,
pub bldcnt: BlendControl,
pub bldalpha: BlendAlpha,
pub bldy: u16,
cycles: usize,
pub frame_buffer: FrameBuffer,
pub state: GpuState,
pub current_scanline: usize, // VCOUNT
}
impl Gpu {
@ -208,12 +243,10 @@ impl Gpu {
dispstat: DisplayStatus(0),
bg: [Bg::default(); 4],
bg_aff: [BgAffine::default(); 2],
win0h: 0,
win1h: 0,
win0v: 0,
win1v: 0,
winin: 0,
winout: 0,
win0: Window::default(),
win1: Window::default(),
winout_flags: WindowFlags::from(0),
winobj_flags: WindowFlags::from(0),
mosaic: RegMosaic(0),
bldcnt: BlendControl(0),
bldalpha: BlendAlpha(0),
@ -405,10 +438,10 @@ impl Gpu {
_ => panic!("{:?} not supported", self.dispcnt.mode()),
}
self.mosaic_sfx();
let post_blend_line = self.blend_line(sb);
let post_sfx_line = self.composite_sfx(sb);
for x in 0..DISPLAY_WIDTH {
self.frame_buffer.0[x + self.current_scanline * DISPLAY_WIDTH] =
post_blend_line[x].to_rgb24();
post_sfx_line[x].to_rgb24();
}
}

67
src/core/gpu/regs.rs
View file

@ -1,4 +1,4 @@
use super::blend::BldMode;
use super::sfx::BldMode;
use super::*;
pub const SCREEN_BLOCK_SIZE: u32 = 0x800;
@ -7,6 +7,9 @@ impl DisplayControl {
pub fn disp_bg(&self, bg: usize) -> bool {
self.0.bit(8 + bg)
}
pub fn is_using_windows(&self) -> bool {
self.disp_window0() || self.disp_window1() || self.disp_obj_window()
}
}
impl BgControl {
@ -106,6 +109,7 @@ bitfield! {
}
bitflags! {
#[derive(Default)]
pub struct BlendFlags: u32 {
const BG0 = 0b00000001;
const BG1 = 0b00000010;
@ -122,12 +126,18 @@ impl From<u16> for BlendFlags {
}
}
pub const BG_LAYER_FLAG: [BlendFlags; 4] = [
BlendFlags::BG0,
BlendFlags::BG1,
BlendFlags::BG2,
BlendFlags::BG3,
];
impl BlendFlags {
const BG_LAYER_FLAG: [BlendFlags; 4] = [
BlendFlags::BG0,
BlendFlags::BG1,
BlendFlags::BG2,
BlendFlags::BG3,
];
pub fn from_bg(bg: usize) -> BlendFlags {
Self::BG_LAYER_FLAG[bg]
}
}
bitfield! {
#[derive(Default, Copy, Clone)]
@ -146,3 +156,46 @@ bitfield! {
pub eva, _: 5, 0;
pub evb, _: 12, 8;
}
bitflags! {
#[derive(Default)]
pub struct WindowFlags: u32 {
const BG0 = 0b00000001;
const BG1 = 0b00000010;
const BG2 = 0b00000100;
const BG3 = 0b00001000;
const OBJ = 0b00010000;
const SFX = 0b00100000;
}
}
impl From<u16> for WindowFlags {
fn from(v: u16) -> WindowFlags {
WindowFlags::from_bits(v as u32).unwrap()
}
}
impl WindowFlags {
pub fn sfx_enabled(&self) -> bool {
self.contains(WindowFlags::SFX)
}
pub fn bg_enabled(&self, bg: usize) -> bool {
self.contains(BG_WIN_FLAG[bg])
}
}
const BG_WIN_FLAG: [WindowFlags; 4] = [
WindowFlags::BG0,
WindowFlags::BG1,
WindowFlags::BG2,
WindowFlags::BG3,
];
bitfield! {
#[derive(Default, Copy, Clone)]
pub struct WindowReg(u16);
impl Debug;
u16;
pub into WindowFlags, lower, _: 5, 0;
pub into WindowFlags, upper, _: 13, 8;
}

193
src/core/gpu/sfx.rs
View file

@ -27,91 +27,168 @@ impl Rgb15 {
}
}
impl From<WindowFlags> for BlendFlags {
fn from(wf: WindowFlags) -> BlendFlags {
BlendFlags::from_bits(wf.bits()).unwrap()
}
}
#[derive(Debug, Default)]
struct Layer {
color: Rgb15,
blend_flag: BlendFlags,
}
impl Gpu {
fn get_topmost_color(
fn get_top_layer(
&self,
sb: &SysBus,
screen_x: usize,
layers: &BlendFlags,
) -> Option<Rgb15> {
bflags: BlendFlags,
wflags: WindowFlags,
) -> Option<Layer> {
// TODO - only BGs are supported, don't forget OBJs
let mut color: Option<Rgb15> = None;
// priorities are 0-4 when 0 is the highest
'outer: for priority in 0..4 {
for bg in 0..4 {
let c = self.bg[bg].line[screen_x];
let bflag = BlendFlags::from_bg(bg);
if self.dispcnt.disp_bg(bg)
&& !c.is_transparent()
&& (layers.is_empty() || layers.contains(BG_LAYER_FLAG[bg]))
&& bflags.contains(bflag)
&& wflags.bg_enabled(bg)
&& self.bg[bg].bgcnt.priority() == priority
{
color = Some(c);
break 'outer;
return Some(Layer {
color: c,
blend_flag: bflag,
});
}
}
}
if color.is_none() && layers.contains(BlendFlags::BACKDROP) {
color = Some(Rgb15(sb.palette_ram.read_16(0)))
if bflags.contains(BlendFlags::BACKDROP) {
return Some(Layer {
color: Rgb15(sb.palette_ram.read_16(0)),
blend_flag: BlendFlags::BACKDROP,
});
}
color
None
}
pub fn blend_line(&mut self, sb: &mut SysBus) -> Scanline {
let mut bld_line = Scanline::default();
let bldmode = self.bldcnt.mode();
match bldmode {
BldMode::BldAlpha => {
let top_layers = self.bldcnt.top();
let bottom_layers = self.bldcnt.bottom();
fn get_active_window_type(&self, x: usize, y: usize) -> WindowType {
if !self.dispcnt.is_using_windows() {
WindowType::WinNone
} else {
if self.dispcnt.disp_window0() && self.win0.inside(x, y) {
return WindowType::Win0;
}
if self.dispcnt.disp_window1() && self.win1.inside(x, y) {
return WindowType::Win1;
}
// TODO win_obj
return WindowType::WinOut;
}
}
for x in 0..DISPLAY_WIDTH {
if let Some(top_color) = self.get_topmost_color(sb, x, &top_layers) {
if let Some(bot_color) = self.get_topmost_color(sb, x, &bottom_layers) {
let eva = self.bldalpha.eva();
let evb = self.bldalpha.evb();
bld_line[x] = top_color.blend_with(bot_color, eva, evb);
} else {
bld_line[x] = top_color;
}
fn get_window_flags(&self, wintyp: WindowType) -> WindowFlags {
match wintyp {
WindowType::Win0 => self.win0.flags,
WindowType::Win1 => self.win1.flags,
WindowType::WinObj => self.winobj_flags,
WindowType::WinOut => self.winout_flags,
WindowType::WinNone => WindowFlags::all(),
}
}
fn sfx_blend_alpha(
&self,
sb: &SysBus,
x: usize,
_y: usize,
wflags: WindowFlags,
) -> Option<Rgb15> {
let top_layers = self.bldcnt.top();
let bottom_layers = self.bldcnt.bottom();
if let Some(top_layer) = self.get_top_layer(sb, x, top_layers, wflags) {
if let Some(bot_layer) = self.get_top_layer(sb, x, bottom_layers, wflags) {
let eva = self.bldalpha.eva();
let evb = self.bldalpha.evb();
return Some(top_layer.color.blend_with(bot_layer.color, eva, evb));
} else {
return Some(top_layer.color);
}
}
None
}
fn sfx_blend_bw(
&self,
sb: &SysBus,
fadeto: Rgb15,
x: usize,
_y: usize,
wflags: WindowFlags,
) -> Option<Rgb15> {
let top_layers = self.bldcnt.top();
let evy = self.bldy;
if let Some(layer) = self.get_top_layer(sb, x, top_layers, wflags) {
return Some(layer.color.blend_with(fadeto, 16 - evy, evy));
}
None
}
pub fn composite_sfx(&self, sb: &SysBus) -> Scanline {
let mut line = Scanline::default();
let y = self.current_scanline;
for x in 0..DISPLAY_WIDTH {
let window = self.get_active_window_type(x, y);
let wflags = self.get_window_flags(window);
let toplayer = self
.get_top_layer(sb, x, BlendFlags::all(), wflags)
.unwrap();
let bldmode = if wflags.sfx_enabled() {
self.bldcnt.mode()
} else {
BldMode::BldNone
};
match bldmode {
BldMode::BldAlpha => {
if self.bldcnt.top().contains(toplayer.blend_flag)
|| self.bldcnt.bottom().contains(toplayer.blend_flag)
{
line[x] = self
.sfx_blend_alpha(sb, x, y, wflags)
.unwrap_or(toplayer.color);
} else {
bld_line[x] = self.get_topmost_color(sb, x, &BlendFlags::all()).unwrap();
line[x] = toplayer.color;
}
}
}
BldMode::BldWhite => {
let top_layers = self.bldcnt.top();
let evy = self.bldy;
for x in 0..DISPLAY_WIDTH {
bld_line[x] =
if let Some(top_color) = self.get_topmost_color(sb, x, &top_layers) {
top_color.blend_with(Rgb15::WHITE, 16 - evy, evy)
} else {
self.get_topmost_color(sb, x, &BlendFlags::all()).unwrap()
};
BldMode::BldWhite => {
let result = if self.bldcnt.top().contains(toplayer.blend_flag) {
self.sfx_blend_bw(sb, Rgb15::WHITE, x, y, wflags)
.unwrap_or(toplayer.color)
} else {
toplayer.color
};
line[x] = result;
}
}
BldMode::BldBlack => {
let top_layers = self.bldcnt.top();
let evy = self.bldy;
for x in 0..DISPLAY_WIDTH {
bld_line[x] =
if let Some(top_color) = self.get_topmost_color(sb, x, &top_layers) {
top_color.blend_with(Rgb15::BLACK, 16 - evy, evy)
} else {
self.get_topmost_color(sb, x, &BlendFlags::all()).unwrap()
};
BldMode::BldBlack => {
let result = if self.bldcnt.top().contains(toplayer.blend_flag) {
self.sfx_blend_bw(sb, Rgb15::BLACK, x, y, wflags)
.unwrap_or(toplayer.color)
} else {
toplayer.color
};
line[x] = result;
}
}
BldMode::BldNone => {
for x in 0..DISPLAY_WIDTH {
bld_line[x] = self.get_topmost_color(sb, x, &BlendFlags::all()).unwrap();
BldMode::BldNone => {
line[x] = toplayer.color;
}
}
}
bld_line
line
}
}

55
src/core/ioregs.rs
View file

@ -3,6 +3,7 @@ use std::rc::Rc;
use super::arm7tdmi::{Addr, Bus};
use super::gba::IoDevices;
use super::gpu::regs::WindowFlags;
use super::keypad;
use super::sysbus::BoxedMemory;
@ -163,12 +164,16 @@ impl Bus for IoRegs {
REG_BG1CNT => io.gpu.bg[1].bgcnt.0,
REG_BG2CNT => io.gpu.bg[2].bgcnt.0,
REG_BG3CNT => io.gpu.bg[3].bgcnt.0,
REG_WIN0H => io.gpu.win0h,
REG_WIN1H => io.gpu.win1h,
REG_WIN0V => io.gpu.win0v,
REG_WIN1V => io.gpu.win1v,
REG_WININ => io.gpu.winin,
REG_WINOUT => io.gpu.winout,
REG_WIN0H => ((io.gpu.win0.left as u16) << 8 | (io.gpu.win0.right as u16)),
REG_WIN1H => ((io.gpu.win1.left as u16) << 8 | (io.gpu.win1.right as u16)),
REG_WIN0V => ((io.gpu.win0.top as u16) << 8 | (io.gpu.win0.bottom as u16)),
REG_WIN1V => ((io.gpu.win1.top as u16) << 8 | (io.gpu.win1.bottom as u16)),
REG_WININ => {
((io.gpu.win1.flags.bits() as u16) << 8) | (io.gpu.win0.flags.bits() as u16)
}
REG_WINOUT => {
((io.gpu.winobj_flags.bits() as u16) << 8) | (io.gpu.winout_flags.bits() as u16)
}
REG_BLDCNT => io.gpu.bldcnt.0,
REG_BLDALPHA => io.gpu.bldalpha.0,
@ -236,12 +241,38 @@ impl Bus for IoRegs {
REG_BG3PB => io.gpu.bg_aff[1].pb = value as i16,
REG_BG3PC => io.gpu.bg_aff[1].pc = value as i16,
REG_BG3PD => io.gpu.bg_aff[1].pd = value as i16,
REG_WIN0H => io.gpu.win0h = value,
REG_WIN1H => io.gpu.win1h = value,
REG_WIN0V => io.gpu.win0v = value,
REG_WIN1V => io.gpu.win1v = value,
REG_WININ => io.gpu.winin = value,
REG_WINOUT => io.gpu.winout = value,
REG_WIN0H => {
let right = value & 0xff;
let left = value >> 8;
io.gpu.win0.right = right as u8;
io.gpu.win0.left = left as u8;
}
REG_WIN1H => {
let right = value & 0xff;
let left = value >> 8;
io.gpu.win1.right = right as u8;
io.gpu.win1.left = left as u8;
}
REG_WIN0V => {
let bottom = value & 0xff;
let top = value >> 8;
io.gpu.win0.bottom = bottom as u8;
io.gpu.win0.top = top as u8;
}
REG_WIN1V => {
let bottom = value & 0xff;
let top = value >> 8;
io.gpu.win1.bottom = bottom as u8;
io.gpu.win1.top = top as u8;
}
REG_WININ => {
io.gpu.win0.flags = WindowFlags::from(value & 0xff);
io.gpu.win1.flags = WindowFlags::from(value >> 8);
}
REG_WINOUT => {
io.gpu.winout_flags = WindowFlags::from(value & 0xff);
io.gpu.winobj_flags = WindowFlags::from(value >> 8);
}
REG_MOSAIC => io.gpu.mosaic.0 = value,
REG_BLDCNT => io.gpu.bldcnt.0 = value,
REG_BLDALPHA => io.gpu.bldalpha.0 = value,