fix(glsl): fix bilinear texture call in sim

basics · Jul 3, 2021 · 89fc7eb · 89fc7eb
1 parent de9106c
commit 89fc7eb
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Showing 2 changed files with 3 additions and 3 deletions.
diff --git a/src/glsl/builtin-texture.js b/src/glsl/builtin-texture.js
@@ -13,8 +13,8 @@ export class Texture2D {
 
   get(builtIn, pos) {
     const { w, h, bilinear } = this;
-    let x = pos.x * w;
-    let y = pos.y * h;
+    let x = pos.x * w - 0.5;
+    let y = pos.y * h - 0.5;
 
     x = (x + w) % w;
     y = (y + h) % h;

diff --git a/test/glsl/sim.js b/test/glsl/sim.js
@@ -306,7 +306,7 @@ float action(vec2 one, vec2 two) {
 
     const shader = ({ texture, vec2, vec4, sampler2D }) => {
       let bar = vec4((image = sampler2D()) => {
-        return texture(image, vec2(0.0, 0.0));
+        return texture(image, vec2(0.5, 0.5));
       });
       return { bar };
     };