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chore: crude background window impl (no affine)

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This commit is contained in:
Rekai Nyangadzayi Musuka
2022-07-08 18:17:23 -03:00
parent a2e93b98ce
commit 9992acfb55
1 changed files with 53 additions and 0 deletions
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53
src/core/ppu.zig
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@@ -539,6 +539,59 @@ pub const Ppu = struct {
const x = hofs + i;
const win0 = self.dispcnt.win_enable.read() & 1 == 1;
const win1 = (self.dispcnt.win_enable.read() >> 1) & 1 == 1;
const winObj = self.dispcnt.obj_win_enable.read();
if (win0 or win1 or winObj) blk: {
// Window is enabled
const win0_in = (self.win.in.w0_bg.read() >> n) & 1 == 1;
const win1_in = (self.win.in.w1_bg.read() >> n) & 1 == 1;
const win_out = (self.win.out.out_bg.read() >> n) & 1 == 1;
if (win0) {
const h = self.win.h[0];
const v = self.win.v[0];
const y1 = v.y1.read();
const y2 = if (y1 > v.y2.read()) 160 else std.math.min(160, v.y2.read());
if (y1 <= y and y < y2) {
// Within Y bounds
const x1 = h.x1.read();
const x2 = if (x1 > h.x2.read()) 240 else std.math.min(240, h.x2.read());
// Within X and & bounds, render Win0 Pixel
if (x1 <= x and x < x2) {
if (win0_in) break :blk else continue;
}
}
}
if (win1) {
const h = self.win.h[1];
const v = self.win.v[1];
const y1 = v.y1.read();
const y2 = if (y1 > v.y2.read()) 160 else std.math.min(160, v.y2.read());
if (y1 <= y and y < y2) {
// Within Y bounds
const x1 = h.x1.read();
const x2 = if (x1 > h.x2.read()) 240 else std.math.min(240, h.x2.read());
// Within X and & bounds, render Win1 Pixel
if (x1 <= x and x < x2) {
if (win1_in) break :blk else continue;
}
}
}
// If not Win0 nor Win1 and WinOut isn't enabled,
// then don't render this pixel
if (!win_out) continue;
}
// Grab the Screen Entry from VRAM
const entry_addr = screen_base + tilemapOffset(size, x, y);
const entry = @bitCast(ScreenEntry, self.vram.read(u16, entry_addr));