1 files changed, 51 insertions, 0 deletions
diff --git a/advanced_lighting/4.normal_mapping/shaders/normal_map.frag b/advanced_lighting/4.normal_mapping/shaders/normal_map.frag
new file mode 100644
index 0000000..964d6f8
--- /dev/null
+++ b/advanced_lighting/4.normal_mapping/shaders/normal_map.frag
@@ -0,0 +1,51 @@
+#version 330 core
+
+in VS_OUT {
+    /* mat3 TBN; */
+    vec3 frag_pos;
+    vec3 tangent_light_pos;
+    vec3 tangent_view_pos;
+    vec3 tangent_frag_pos;
+    vec2 tex_coords;
+} fs_in;
+
+out vec4 frag_color;
+
+/* uniform vec3 light_pos; */
+/* uniform vec3 view_pos; */
+
+uniform sampler2D diffuse_texture;
+uniform sampler2D normal_map;
+
+void main(void)
+{
+    vec3 color = vec3(texture(diffuse_texture, fs_in.tex_coords));
+    vec3 normal = vec3(texture(normal_map, fs_in.tex_coords));
+    normal = normalize((normal*2.0)-1.0);
+    /*
+    normal = normalize(fs_in.TBN*normal);
+
+    vec3 light_dir = fs_in.TBN * normalize(light_pos - fs_in.frag_pos);
+    vec3 view_dir = fs_in.TBN * normalize(view_pos - fs_in.frag_pos);
+    */
+
+    vec3 light_color = vec3(1.0);
+
+    float ambient = 0.01;
+
+    /* vec3 light_dir = normalize(light_pos-fs_in.frag_pos); */
+    vec3 light_dir = normalize(fs_in.tangent_light_pos - fs_in.tangent_frag_pos);
+    float diff = max(dot(light_dir, normal), 0.0);
+    vec3 diffuse = diff*light_color;
+
+    /* vec3 view_dir = normalize(view_pos-fs_in.frag_pos); */
+    vec3 view_dir = normalize(fs_in.tangent_view_pos-fs_in.frag_pos);
+    vec3 halfway_dir = normalize(light_dir+view_dir); 
+    float spec = pow(max(dot(halfway_dir, normal), 0.0), 64.0);
+    float spec_strength = 1.0;
+    vec3 specular = spec_strength*spec*light_color;
+
+    vec3 result = (ambient+diffuse+specular)*color;
+
+    frag_color = vec4(result, 1.0);
+}