From b3f0df24c98dc6a7a341271dd85451345f2be1a7 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sat, 31 Jan 2026 01:49:07 +0000
Subject: Initial commit using tesselation shader to create curves

Disables glslangValidator because of file extension mess up.
---
 gfx/gl/shaders/networkCurve.tcs | 43 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 gfx/gl/shaders/networkCurve.tcs

(limited to 'gfx/gl/shaders/networkCurve.tcs')

diff --git a/gfx/gl/shaders/networkCurve.tcs b/gfx/gl/shaders/networkCurve.tcs
new file mode 100644
index 0000000..4221e64
--- /dev/null
+++ b/gfx/gl/shaders/networkCurve.tcs
@@ -0,0 +1,43 @@
+#version 460 core
+
+layout(vertices = 1) out;
+flat in ivec3 apos[];
+flat in ivec3 bpos[];
+flat in ivec3 cpos[];
+flat in float reps[];
+flat in float aangle[];
+flat in float bangle[];
+flat in float radius[];
+
+flat out ivec3 c_apos[];
+flat out ivec3 c_bpos[];
+flat out ivec3 c_cpos[];
+flat out float c_reps[];
+flat out float c_aangle[];
+flat out float c_bangle[];
+flat out float c_radius[];
+
+int
+min2pow(float target)
+{
+	int x = 1;
+	while (x < target) {
+		x <<= 1;
+	}
+	return x;
+}
+
+void
+main()
+{
+	c_apos[gl_InvocationID] = apos[gl_InvocationID];
+	c_bpos[gl_InvocationID] = bpos[gl_InvocationID];
+	c_cpos[gl_InvocationID] = cpos[gl_InvocationID];
+	c_reps[gl_InvocationID] = reps[gl_InvocationID];
+	c_aangle[gl_InvocationID] = aangle[gl_InvocationID];
+	c_bangle[gl_InvocationID] = bangle[gl_InvocationID];
+	c_radius[gl_InvocationID] = radius[gl_InvocationID];
+
+	gl_TessLevelOuter[0] = 1;
+	gl_TessLevelOuter[1] = min2pow(reps[gl_InvocationID]);
+}
-- 
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