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feat: implement brightness increase/decrease

This commit is contained in:
Rekai Nyangadzayi Musuka 2022-10-21 05:12:52 -03:00
parent 27259c97db
commit 125b931d0c
1 changed files with 43 additions and 18 deletions
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61
src/ppu.zig
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@ -390,8 +390,7 @@ pub const Ppu = struct {
const maybe_top = maybe_px;
const maybe_btm = self.scanline.btm()[i];
// TODO: Why must I reverse this?
const bgr555 = getBgr555(&self.palette, self.bldalpha, maybe_btm, maybe_top);
const bgr555 = self.getBgr555(maybe_top, maybe_btm);
std.mem.writeIntNative(u32, self.framebuf.get(.Emulator)[fb_base + i * @sizeOf(u32) ..][0..@sizeOf(u32)], COLOUR_LUT[bgr555 & 0x7FFF]);
}
@ -418,8 +417,7 @@ pub const Ppu = struct {
const maybe_top = maybe_px;
const maybe_btm = self.scanline.btm()[i];
// TODO: Why must I reverse this?
const bgr555 = getBgr555(&self.palette, self.bldalpha, maybe_btm, maybe_top);
const bgr555 = self.getBgr555(maybe_top, maybe_btm);
std.mem.writeIntNative(u32, self.framebuf.get(.Emulator)[fb_base + i * @sizeOf(u32) ..][0..@sizeOf(u32)], COLOUR_LUT[bgr555 & 0x7FFF]);
}
@ -445,8 +443,7 @@ pub const Ppu = struct {
const maybe_top = maybe_px;
const maybe_btm = self.scanline.btm()[i];
// TODO: Why must I reverse this?
const bgr555 = getBgr555(&self.palette, self.bldalpha, maybe_btm, maybe_top);
const bgr555 = self.getBgr555(maybe_top, maybe_btm);
std.mem.writeIntNative(u32, self.framebuf.get(.Emulator)[fb_base + i * @sizeOf(u32) ..][0..@sizeOf(u32)], COLOUR_LUT[bgr555 & 0x7FFF]);
}
@ -497,6 +494,44 @@ pub const Ppu = struct {
}
}
fn getBgr555(self: *Self, maybe_top: ?u16, maybe_btm: ?u16) u16 {
if (maybe_btm) |btm| {
return switch (self.bldcnt.mode.read()) {
0b00 => if (maybe_top) |top| top else btm,
0b01 => if (maybe_top) |top| alphaBlend(btm, top, self.bldalpha) else btm,
0b10 => blk: {
const evy: u16 = self.bldy.evy.read();
const r = btm & 0x1F;
const g = (btm >> 5) & 0x1F;
const b = (btm >> 10) & 0x1F;
const bld_r = r + (((31 - r) * evy) >> 4);
const bld_g = g + (((31 - g) * evy) >> 4);
const bld_b = b + (((31 - b) * evy) >> 4);
break :blk (bld_b << 10) | (bld_g << 5) | bld_r;
},
0b11 => blk: {
const evy: u16 = self.bldy.evy.read();
const btm_r = btm & 0x1F;
const btm_g = (btm >> 5) & 0x1F;
const btm_b = (btm >> 10) & 0x1F;
const bld_r = btm_r - ((btm_r * evy) >> 4);
const bld_g = btm_g - ((btm_g * evy) >> 4);
const bld_b = btm_b - ((btm_b * evy) >> 4);
break :blk (bld_b << 10) | (bld_g << 5) | bld_r;
},
};
}
if (maybe_top) |top| return top;
return self.palette.getBackdrop();
}
// TODO: Comment this + get a better understanding
fn tilemapOffset(size: u2, x: u32, y: u32) u32 {
// Current Row: (y % PIXEL_COUNT) / 8
@ -1033,16 +1068,6 @@ fn toRgba8888Talarubi(bgr555: u16) u32 {
return @floatToInt(u32, out_r) << 24 | @floatToInt(u32, out_g) << 16 | @floatToInt(u32, out_b) << 8 | 0xFF;
}
fn getBgr555(palette: *const Palette, bldalpha: io.BldAlpha, maybe_top: ?u16, maybe_btm: ?u16) u16 {
if (maybe_top) |top| {
if (maybe_btm) |btm| return alphaBlend(top, btm, bldalpha);
return top;
}
if (maybe_btm) |btm| return btm;
return palette.getBackdrop();
}
fn alphaBlend(top: u16, btm: u16, bldalpha: io.BldAlpha) u16 {
const eva: u16 = bldalpha.eva.read();
const evb: u16 = bldalpha.evb.read();
@ -1108,7 +1133,7 @@ fn shouldDrawSprite(bldcnt: io.BldCnt, scanline: *Scanline, x: u9) bool {
}
fn copyToBackgroundBuffer(comptime n: u2, bldcnt: io.BldCnt, scanline: *Scanline, i: usize, bgr555: u16) void {
if (bldcnt.mode.read() == 0b01) {
if (bldcnt.mode.read() != 0b00) {
// Standard Alpha Blending
const a_layers = bldcnt.layer_a.read();
const is_blend_enabled = (a_layers >> n) & 1 == 1;
@ -1125,7 +1150,7 @@ fn copyToBackgroundBuffer(comptime n: u2, bldcnt: io.BldCnt, scanline: *Scanline
}
fn copyToSpriteBuffer(bldcnt: io.BldCnt, scanline: *Scanline, x: u9, bgr555: u16) void {
if (bldcnt.mode.read() == 0b01) {
if (bldcnt.mode.read() != 0b00) {
// Alpha Blending
const a_layers = bldcnt.layer_a.read();
const is_blend_enabled = (a_layers >> 4) & 1 == 1;