1 files changed, 25 insertions, 0 deletions
diff --git a/advanced_lighting/3.1.shadow_mapping/shaders/debug_quad.frag b/advanced_lighting/3.1.shadow_mapping/shaders/debug_quad.frag
new file mode 100644
index 0000000..4cb6df1
--- /dev/null
+++ b/advanced_lighting/3.1.shadow_mapping/shaders/debug_quad.frag
@@ -0,0 +1,25 @@
+#version 330 core
+
+in vec2 tex_coords;
+
+out vec4 frag_color;
+
+uniform sampler2D depth_map;
+uniform float near;
+uniform float far;
+
+float linearize_depth(float depth)
+{
+    float z = (depth+1.0)*0.5;
+    return((2.0*near*far)/(far+near-z*(far-near)));
+}
+
+void main(void)
+{
+    float depth = texture(depth_map, tex_coords).r;
+
+    /* frag_color = vec4(vec3(depth), 1.0); */
+
+    /* NOTE(pryazha): For visual debugging of perspective projection light */
+    frag_color = vec4(vec3(linearize_depth(depth)/far), 1.0);
+}