stuff

shaders/geometry.vert

@@ -6,19 +6,39 @@ layout (location = 2) in vec2 aTexCoord;
 out vec3 FragPos;
 out vec3 Normal;
 out vec2 TexCoord;
-out vec4 FragPosLightSpace;
 
 uniform mat4 proj;
 uniform mat4 view;
 uniform mat4 modl;
-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 aTexCoord + 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()
 {
     vec4 worldPos   = modl * vec4(aPos, 1.0);
     FragPos         = worldPos.xyz;
-    Normal          = normalize(mat3(transpose(inverse(modl))) * aNormal);
-    TexCoord        = aTexCoord;
-    FragPosLightSpace = lightSpaceMatrix * worldPos;
+    Normal          = normalize(CofactorMatrix(mat3(modl)) * aNormal);
+    TexCoord        = SurfaceUV();
     gl_Position     = proj * view * worldPos;
 }