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Draw first-pass of H/V warp BGs 3 pixels to the left

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There's a noticeable seam in the horizontal and warp backgrounds
whenever you enter a new room. Entering a new room triggers the game to
re-draw the entire warp background instead of simply scrolling what it
already has. This seam is the result of the initial background draw
being misaligned with the rest of the scrolling.

If you get out your measuring tools, you'll see that it's misaligned by
exactly 3 pixels (this applies to both horizontal and vertical warping).
If you look at the part of the code where the game draws fresh warping
textures after scrolling the existing ones offscreen, you'll see it
starts with an offset of 317, which is exactly 320 minus 3. And for
vertical, it uses 237, which is exactly 240 minus 3.

This is where the misalignment comes from. Since the incoming textures
are drawn 3 pixels to the left, but the initial draw isn't, this results
in a misalignment and causes the seam.

To fix this, draw the initial draw of the horizontal and vertical warp
backgrounds 3 pixels to the left.
This commit is contained in:
Misa 2020-04-25 11:48:02 -07:00 committed by Ethan Lee
parent f444e74550
commit 6e0b267aac
1 changed files with 8 additions and 8 deletions
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16
desktop_version/src/Graphics.cpp
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@ -2122,10 +2122,10 @@ void Graphics::drawbackground( int t )
for (int i = 0; i < 21; i++)
{
temp = 680 + (rcol * 3);
drawtowertile((i * 16) - backoffset, (j * 16), temp+40);
drawtowertile((i * 16) - backoffset + 8, (j * 16), temp + 41);
drawtowertile((i * 16) - backoffset, (j * 16) + 8, temp + 80);
drawtowertile((i * 16) - backoffset + 8, (j * 16) + 8, temp + 81);
drawtowertile((i * 16) - backoffset - 3, (j * 16), temp+40);
drawtowertile((i * 16) - backoffset + 8 - 3, (j * 16), temp + 41);
drawtowertile((i * 16) - backoffset - 3, (j * 16) + 8, temp + 80);
drawtowertile((i * 16) - backoffset + 8 - 3, (j * 16) + 8, temp + 81);
}
}
backgrounddrawn = true;
@ -2158,10 +2158,10 @@ void Graphics::drawbackground( int t )
for (int i = 0; i < 21; i++)
{
temp = 760 + (rcol * 3);
drawtowertile((i * 16), (j * 16)- backoffset, temp+40);
drawtowertile((i * 16)+ 8, (j * 16)- backoffset, temp + 41);
drawtowertile((i * 16), (j * 16)- backoffset + 8, temp + 80);
drawtowertile((i * 16)+ 8, (j * 16)- backoffset + 8, temp + 81);
drawtowertile((i * 16), (j * 16)- backoffset - 3, temp+40);
drawtowertile((i * 16)+ 8, (j * 16)- backoffset - 3, temp + 41);
drawtowertile((i * 16), (j * 16)- backoffset + 8 - 3, temp + 80);
drawtowertile((i * 16)+ 8, (j * 16)- backoffset + 8 - 3, temp + 81);
}
}
backgrounddrawn = true;