stuff

shaders/default.vert

@@ -13,11 +13,35 @@ uniform mat4 proj;
 
 uniform mat4 lightSpaceMatrix;
 
+uniform int uvMode = 0;                // 0 = stretch, 1 = tile
+uniform vec3 tileScale = vec3(1.0);
+uniform vec2 uvOffset = vec2(0.0);
+
+// Same direction as transpose(inverse(m)) for normals, without the per vertex inverse
+mat3 CofactorMatrix(mat3 m)
+{
+    return mat3(cross(m[1], m[2]), cross(m[2], m[0]), cross(m[0], m[1]));
+}
+
+// Tiling ignores the mesh's uvs and projects from whichever axis the surface faces,
+// so every face of a stretched cube repeats at the same size
+vec2 SurfaceUV()
+{
+    if (uvMode == 0) return aTex + uvOffset;
+
+    vec3 n = abs(aNormal);
+    vec3 p = aPos * tileScale;
+    if (n.y >= n.x && n.y >= n.z) return p.xz + uvOffset;
+    if (n.x >= n.z) return p.zy + uvOffset;
+    return p.xy + uvOffset;
+}
+
 void main()
 {
-    FragPos = vec3(modl * vec4(aPos, 1.0));
-	normal = transpose(inverse(mat3(modl))) * aNormal;
-    texCoord = aTex;
-    fragposlightspace = lightSpaceMatrix * vec4(FragPos, 1.0);
-    gl_Position = proj* view * modl * vec4(aPos,1.0f);
+    vec4 worldPos = modl * vec4(aPos, 1.0);
+    FragPos = worldPos.xyz;
+    normal = CofactorMatrix(mat3(modl)) * aNormal;
+    texCoord = SurfaceUV();
+    fragposlightspace = lightSpaceMatrix * worldPos;
+    gl_Position = proj * view * worldPos;
 }