From 9900ffe840ee0e9f914b0e7956a4e80ffb553e9e Mon Sep 17 00:00:00 2001
From: talha <talha@talhaamir.xyz>
Date: Tue, 16 Apr 2024 02:04:23 +0500
Subject: Added refraction, albeit slightly limited

---
 source/shaders/refr.fs.glsl | 15 +++++++++++++++
 source/shaders/refr.vs.glsl | 20 ++++++++++++++++++++
 2 files changed, 35 insertions(+)
 create mode 100644 source/shaders/refr.fs.glsl
 create mode 100644 source/shaders/refr.vs.glsl

(limited to 'source/shaders')

diff --git a/source/shaders/refr.fs.glsl b/source/shaders/refr.fs.glsl
new file mode 100644
index 0000000..6747ded
--- /dev/null
+++ b/source/shaders/refr.fs.glsl
@@ -0,0 +1,15 @@
+#version 330 core
+
+in vec3 Normal;
+in vec3 Position;
+
+uniform samplerCube skybox;
+uniform vec3 cameraPos;
+out vec4 FragColor;
+
+void main() {
+  float refr_ratio = 1.0/1.52;
+  vec3 I = normalize(Position - cameraPos);
+  vec3 R = refract(I, normalize(Normal), refr_ratio); 
+  FragColor = vec4(texture(skybox, R).rgb, 1.0);
+};
diff --git a/source/shaders/refr.vs.glsl b/source/shaders/refr.vs.glsl
new file mode 100644
index 0000000..0554f0a
--- /dev/null
+++ b/source/shaders/refr.vs.glsl
@@ -0,0 +1,20 @@
+#version 330 core
+layout(location=0) in vec3 aPos;
+layout(location=1) in vec3 aNormal;
+
+uniform mat4 View;
+uniform mat4 Model;
+uniform mat4 Projection;
+
+out vec3 Normal;
+out vec3 Position;
+
+void main() {
+  // @note: This is the calculation for getting the normal vector
+  // one that is unaffected by non-uniform scaling that is.
+  // look at the lighting chapter in learnopengl.com to understand this more
+  Normal = mat3(transpose(inverse(Model))) * aNormal;
+  Position = vec3(Model * vec4(aPos, 1.0));
+  gl_Position = Projection * View * Model * vec4(aPos, 1.0);
+};
+
-- 
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