Skip to content

Fixes two mirroring-related tiling bugs #19

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
Lilaa3 merged 1 commit into from
Nov 28, 2025
Merged

Fixes two mirroring-related tiling bugs #19

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
1 change: 0 additions & 1 deletion shader/main3d.frag.glsl
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -28,7 +28,6 @@ vec4 sampleSampler(in const sampler2D tex, in const TileConf tileConf, in vec2 u
// https://github.com/rt64/rt64/blob/61aa08f517cd16c1dbee4e097768b08e2a060307/src/shaders/TextureSampler.hlsli#L156-L276
const ivec2 texSize = textureSize(tex, 0);

uvCoord.y = texSize.y - uvCoord.y; // invert Y
uvCoord *= tileConf.shift;

#ifdef SIMULATE_LOW_PRECISION
Expand Down
4 changes: 1 addition & 3 deletions shader/utils.glsl
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -38,7 +38,7 @@ float noise(in vec2 uv)

vec2 mirrorUV(const vec2 uvIn, const vec2 uvBound)
{
vec2 uvMod2 = mod(uvIn, uvBound * 2.0);
vec2 uvMod2 = mod(uvIn, uvBound * 2.0 + 1.0);
return mix(uvMod2, (uvBound * 2.0) - uvMod2, step(uvBound, uvMod2));
}

Expand All @@ -57,7 +57,5 @@ vec4 wrappedMirrorSample(const sampler2D tex, vec2 uv, const vec2 mask, const ve
// clamp again (mask S/T), this is also done to avoid OOB texture access
uv = mod(uv, min(texSize, mask));

uv.y = texSize.y - uv.y - 1; // invert Y back

return texelFetch(tex, ivec2(floor(uv)), 0);
}