something

1 files changed, 46 insertions, 0 deletions

diff --git a/advanced_lighting/8.deferred_shading/shaders/deferred.frag b/advanced_lighting/8.deferred_shading/shaders/deferred.frag
new file mode 100644
index 0000000..56e5f58
--- /dev/null
+++ b/advanced_lighting/8.deferred_shading/shaders/deferred.frag
@@ -0,0 +1,46 @@
+#version 330 core
+
+in vert_t {
+    vec2 tex_coords;
+} vert;
+
+out vec4 frag_color;
+
+uniform sampler2D positions;
+uniform sampler2D normals;
+uniform sampler2D color_specular;
+
+uniform vec3 view_position;
+
+struct light_t {
+    vec3 position;
+    vec3 color;
+};
+
+const int light_count = 200;
+uniform light_t lights[light_count];
+
+const float linear = 0.7f;
+const float quadratic = 1.8f;
+
+void main()
+{
+    vec3 position = texture(positions, vert.tex_coords).rgb;
+    vec3 normal = texture(normals, vert.tex_coords).rgb;
+    vec3 color = texture(color_specular, vert.tex_coords).rgb;
+    float specular = texture(color_specular, vert.tex_coords).a;
+
+    vec3 ambient = 0.1 * color;
+    vec3 view_dir = normalize(view_position - position);
+    vec3 result = ambient;
+    for (int i = 0; i < light_count; i++) {
+        vec3 light_dir = normalize(lights[i].position - position);
+        vec3 diffuse = max(dot(normal, light_dir), 0.0) * color * lights[i].color;
+        float distance = length(lights[i].position - position);
+        float attenuation = 1.0 / (1.0 + linear * distance + quadratic * distance * distance);
+        vec3 halfway_dir = normalize(view_dir + light_dir);
+        vec3 specular = pow(max(dot(halfway_dir, normal), 0.0), 32.0) * vec3(0.5);
+        result += (diffuse + specular) * attenuation;
+    }
+    frag_color = vec4(result, 1.0);
+}