readme

shaders/default.vert

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+#version 330 core
+layout (location = 0) in vec3 aPos;
+layout (location = 1) in vec3 aNormal;
+layout (location = 2) in vec2 aTex;	
+
+out vec3 normal;
+out vec2 texCoord;
+out vec3 FragPos;
+out vec4 fragposlightspace;
+uniform mat4 modl;	
+uniform mat4 view;
+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;
+
+    // Unscale the normal first, so a stretched mesh picks the axis it faces in the world
+    vec3 n = abs(aNormal / max(tileScale, vec3(1e-4)));
+    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 = CofactorMatrix(mat3(modl)) * aNormal;
+    texCoord = SurfaceUV();
+    fragposlightspace = lightSpaceMatrix * worldPos;
+    gl_Position = proj * view * worldPos;
+}