1 files changed, 29 insertions, 0 deletions
diff --git a/advanced_lighting/6.hdr/shaders/hdr.frag b/advanced_lighting/6.hdr/shaders/hdr.frag
new file mode 100644
index 0000000..f12c6a8
--- /dev/null
+++ b/advanced_lighting/6.hdr/shaders/hdr.frag
@@ -0,0 +1,29 @@
+#version 330 core
+
+in VSOUT {
+	vec2		texc;
+} vsout;
+
+out vec4		fcolor;
+
+uniform sampler2D	hdrbuf;
+uniform float		exposure;
+
+void main(void)
+{
+	const float	gamma = 2.2;
+
+	vec3		hdrcolor, mapped;
+
+	hdrcolor = vec3(texture(hdrbuf, vsout.texc));
+
+	/* NOTE(pryazha): Reinhard tone mapping */
+	/* mapped = hdrcolor/(hdrcolor+vec3(1.0)); */
+
+	/* NOTE(pryazha): Tone mapping with exposure (i guess) */
+	mapped = vec3(1.0)-exp(-hdrcolor*exposure);
+
+	mapped = pow(mapped, vec3(1.0/gamma));
+
+	fcolor = vec4(mapped, 1.0);
+}