From 08cb8d6a585dd552b69a488d9db1be123f01467a Mon Sep 17 00:00:00 2001
From: tech kaczynski <tk@techkaczynski.dev>
Date: Tue, 22 Sep 2026 22:38:57 +1000
Subject: initial commit.

---
 res/sdr/mdl_lit.vs | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 res/sdr/mdl_lit.vs

(limited to 'res/sdr/mdl_lit.vs')

diff --git a/res/sdr/mdl_lit.vs b/res/sdr/mdl_lit.vs
new file mode 100644
index 0000000..eb13a28
--- /dev/null
+++ b/res/sdr/mdl_lit.vs
@@ -0,0 +1,28 @@
+#version 330
+
+in vec3 vertexPosition;
+in vec2 vertexTexCoord;
+in vec3 vertexNormal;
+in vec4 vertexColor;
+
+uniform mat4 mvp;
+uniform mat4 matNormal;
+
+out vec2 frag_texcoord;
+out vec4 frag_colour;
+out vec3 frag_world_normal;
+
+void
+main() {
+	frag_texcoord = vertexTexCoord;
+	frag_colour = vertexColor;
+
+	/*
+	 * Do not necessarily normalize here. Interpolation changes the
+	 * length, so the fragment shader must normalize it regardless.
+	 */
+	frag_world_normal =
+		(matNormal * vec4(vertexNormal, 0.0)).xyz;
+
+	gl_Position = mvp * vec4(vertexPosition, 1.0);
+}
-- 
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