Force texture y-coordinate to middle of line in default shader. Substantially improves picture when linear texture filtering is used

1 files changed, 3 insertions, 2 deletions

diff --git a/shaders/default.f.glsl b/shaders/default.f.glsl
index d5eabf6..efc570d 100644
--- a/shaders/default.f.glsl
+++ b/shaders/default.f.glsl
@@ -6,9 +6,10 @@ varying vec2 texcoord;
 
 void main()
 {
+	vec2 modifiedCoord = vec2(texcoord.x, (floor(texcoord.y * 512.0) + 0.5)/512.0);
 	gl_FragColor = mix(
-		texture2D(textures[0], texcoord),
-		texture2D(textures[1], vec2(texcoord.x, texcoord.y - 0.5/1024.0)),
+		texture2D(textures[0], modifiedCoord),
+		texture2D(textures[1], modifiedCoord),
 		(sin((texcoord.y * 1024.0 + 1.0)* 3.14159265359) + 1.0) * 0.5
 	);
 }