From bd49bd525f4c6c6c15c4142bf42d1dd38be6fc16 Mon Sep 17 00:00:00 2001
From: pryazha <pryadeiniv@mail.ru>
Date: Sun, 19 Jan 2025 17:33:44 +0500
Subject: initial commit

---
 geometry_shader/shaders/normals.gs | 44 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 geometry_shader/shaders/normals.gs

(limited to 'geometry_shader/shaders/normals.gs')

diff --git a/geometry_shader/shaders/normals.gs b/geometry_shader/shaders/normals.gs
new file mode 100644
index 0000000..3720a5f
--- /dev/null
+++ b/geometry_shader/shaders/normals.gs
@@ -0,0 +1,44 @@
+#version 330 core
+layout(triangles) in;
+layout(line_strip, max_vertices = 6) out;
+
+in VS_OUT {
+    vec3 normal;
+} gs_in[];
+
+uniform mat4 projection;
+
+const float MAGNITUDE = 0.4;
+
+void
+generate_line(int index)
+{
+    gl_Position = projection*gl_in[index].gl_Position;
+    EmitVertex();
+    gl_Position = projection*(gl_in[index].gl_Position+
+                              vec4(gs_in[index].normal, 0.0)*MAGNITUDE);
+    EmitVertex();
+    EndPrimitive();
+}
+
+void
+main(void)
+{
+    /*
+    vec4 center = (gl_in[0].gl_Position+
+                   gl_in[1].gl_Position+
+                   gl_in[2].gl_Position)/3.0;
+    vec4 end = center+vec4(((gs_in[0].normal+
+                             gs_in[1].normal+
+                             gs_in[2].normal)/3.0),
+                           0.0)*MAGNITUDE;
+    gl_Position = projection*center;
+    EmitVertex();
+    gl_Position = projection*end;
+    EmitVertex();
+    EndPrimitive();
+    */
+    generate_line(0);
+    generate_line(1);
+    generate_line(2);
+}
-- 
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