From 6b8af9cf83851c075c6c9514b1deaa931c2b19a4 Mon Sep 17 00:00:00 2001
From: Thomas Guillermo Albers Raviola <thomas@thomaslabs.org>
Date: Fri, 16 Jan 2026 23:02:32 +0100
Subject: Initial commit

---
 09-september/resources/shaders/shader.vert | 52 ++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 09-september/resources/shaders/shader.vert

(limited to '09-september/resources/shaders/shader.vert')

diff --git a/09-september/resources/shaders/shader.vert b/09-september/resources/shaders/shader.vert
new file mode 100644
index 0000000..69a30e0
--- /dev/null
+++ b/09-september/resources/shaders/shader.vert
@@ -0,0 +1,52 @@
+#version 420
+
+in layout(location=0) vec3 position;
+in layout(location=1) vec2 Texture_UV;
+in layout(location=2) vec3 normal;
+in layout(location=3) vec3 tangent;
+
+uniform mat4 M_MVP;   /* Total Transform matrix */
+uniform mat4 M_model; /* Model to world space transformation matrix */
+
+uniform vec3 lightPosition[4];
+uniform vec3 World_eyePosition;
+
+uniform float number_of_rows;
+uniform vec2 offset;
+
+out vec2 Fragment_UV;
+out vec4 Fragment_Color;
+out vec3 toLightVector[4];
+out vec3 toEyeVector;
+
+void main()
+{
+    /*We add a 0 on the vec4 so we can remove the translation from the matrix
+	(WE DONT WANT THE NORMAL TO BE TRANSLATED) */
+	vec3 n = normalize( (M_model * vec4(normal, 0.0)).xyz );
+	vec3 t = normalize( (M_model * vec4(tangent, 0.0)).xyz );
+
+	/* Orthogonalization */
+	t = normalize(t - dot(t, n) * n);
+
+	vec3 biTangent = normalize( cross(t, n) );
+
+    /* Matrix use by normal mapping */
+	mat3 tbnMatrix = mat3(t, biTangent, n);
+	tbnMatrix = transpose(tbnMatrix);
+
+	vec3 World_Position = vec3(M_model * vec4(position, 1.0));
+
+    for(int i = 0; i < 4; i++)
+    {
+        /* vector que apunta hacia la luz*/
+        toLightVector[i] = tbnMatrix * (lightPosition[i] - World_Position);
+    }
+    /* Vector hacia el ojo*/
+    toEyeVector = normalize( tbnMatrix * (World_eyePosition - World_Position) );
+
+    gl_Position = M_MVP * vec4(position, 1.0);
+
+    Fragment_UV = vec2(Texture_UV.x, 1 - Texture_UV.y); /*Invert y axis*/
+    Fragment_UV = (Fragment_UV / number_of_rows) + offset;
+}
-- 
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