Working with parallax test

assets/parallax_fragment.txt

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+precision mediump float;
+uniform sampler2D Texture;
+uniform sampler2D NormalMap;
+uniform sampler2D HeightMap;
+
+precision highp float;
+
+varying vec2 frag_uv;
+varying vec3 ts_light_pos;
+varying vec3 ts_view_pos;
+varying vec3 ts_frag_pos;
+
+const float num_layers = 16.0;
+
+const float depth_scale = 0.01;
+
+
+
+vec2 parallax_uv(vec2 uv, vec3 view_dir)
+{
+ 
+        float layer_depth = 1.0 / num_layers;
+        float cur_layer_depth = 0.0;
+        vec2 delta_uv = view_dir.xy * depth_scale / (view_dir.z * num_layers);
+        vec2 cur_uv = uv;
+
+        float depth_from_tex = texture2D(HeightMap, cur_uv).r;
+
+        for (int i = 0; i < 32; i++) {
+            cur_layer_depth += layer_depth;
+            cur_uv -= delta_uv;
+            depth_from_tex = texture2D(HeightMap, cur_uv).r;
+            if (depth_from_tex < cur_layer_depth) {
+                break;
+            }
+        }
+
+
+            // Parallax occlusion mapping
+            vec2 prev_uv = cur_uv + delta_uv;
+            float next = depth_from_tex - cur_layer_depth;
+            float prev = texture2D(HeightMap, prev_uv).r - cur_layer_depth
+                         + layer_depth;
+            float weight = next / (next - prev);
+            return mix(cur_uv, prev_uv, weight);
+        
+    
+}
+
+void main(void)
+{
+    vec3 light_dir = normalize(ts_light_pos - ts_frag_pos);
+    vec3 view_dir = normalize(ts_view_pos - ts_frag_pos);
+
+    // Only perturb the texture coordinates if a parallax technique is selected
+    vec2 uv = parallax_uv(frag_uv, view_dir);
+	//vec2 uv = frag_uv;
+
+    vec3 albedo = texture2D(Texture, uv).rgb;
+
+    vec3 ambient = 0.3 * albedo;
+
+    // Normal mapping
+    vec3 norm = normalize(texture2D(NormalMap, uv).rgb * 2.0 - 1.0);
+    float diffuse = max(dot(light_dir, norm), 0.0);
+    gl_FragColor = vec4(diffuse * albedo + ambient, 1.0);
+    
+}

assets/parallax_vertex.txt

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+attribute vec3 vPosition;
+attribute vec2 vTexCoord;
+
+uniform	vec3 eye;
+
+uniform mat4 ModelViewMatrix;
+uniform mat3 NormalMatrix;
+uniform mat4 ProjectionMatrix1;
+uniform mat3 ModelViewMatrix3x3;
+
+varying vec2 frag_uv;
+varying vec3 ts_light_pos; // Tangent space values
+varying vec3 ts_view_pos;  //
+varying vec3 ts_frag_pos;  //
+
+
+mat3 transpose(in mat3 inMatrix)
+{
+    vec3 i0 = inMatrix[0];
+    vec3 i1 = inMatrix[1];
+    vec3 i2 = inMatrix[2];
+
+    mat3 outMatrix = mat3(
+        vec3(i0.x, i1.x, i2.x),
+        vec3(i0.y, i1.y, i2.y),
+        vec3(i0.z, i1.z, i2.z)
+    );
+
+    return outMatrix;
+}
+
+
+void main() 
+{
+	vec3 vert_norm = vec3(0, 1, 0);
+	vec3 vert_tang = vec3(1, 0, 0);
+	vec3 vert_bitang = vec3(0, 0, 1);
+	
+	mat4 mvp = ProjectionMatrix1 * ModelViewMatrix;
+	
+	gl_Position = mvp * vec4(vPosition.xyz, 1.0);
+	
+	ts_frag_pos = vec3(ModelViewMatrix * vec4(vPosition.xyz, 1.0));
+	
+	vec3 t = normalize((NormalMatrix) * vert_tang);
+    vec3 b = normalize((NormalMatrix) * vert_bitang);
+    vec3 n = normalize((NormalMatrix) * vert_norm);
+    mat3 tbn = transpose(mat3(t, b, n));
+	
+	
+    ts_light_pos = tbn * vec3(1,2,0);
+
+    //ts_view_pos = tbn * eye;
+	ts_view_pos = tbn * vec3(0,0,0);
+    ts_frag_pos = tbn * ts_frag_pos;
+
+	
+	frag_uv = vTexCoord;
+	
+}