fix a precision problem in sbuftex-sapp.glsl

floooh · May 6, 2024 · 05a45cd · 05a45cd
1 parent 902dcbe
commit 05a45cd
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/sapp/sbuftex-sapp.glsl b/sapp/sbuftex-sapp.glsl
@@ -19,7 +19,9 @@ out vec3 uv_idx;
 
 void main() {
     gl_Position = mvp * vec4(vtx[gl_VertexIndex].pos, 1.0);
-    uv_idx = vec3(vtx[gl_VertexIndex].uv, float(vtx[gl_VertexIndex].idx));
+    // need to add a bit of wiggle room here to prevent a precision problem on NVIDIA
+    // down in the pixel shader
+    uv_idx = vec3(vtx[gl_VertexIndex].uv, float(vtx[gl_VertexIndex].idx) + 0.5);
 }
 @end