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.gs | 45 ++++++------------------------------------
 1 file changed, 6 insertions(+), 39 deletions(-)

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

diff --git a/gfx/gl/shaders/networkCurve.gs b/gfx/gl/shaders/networkCurve.gs
index 15a6ec9..1002fd4 100644
--- a/gfx/gl/shaders/networkCurve.gs
+++ b/gfx/gl/shaders/networkCurve.gs
@@ -1,48 +1,15 @@
 #version 460 core
 
-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[];
-
-layout(points) in;
-layout(triangle_strip, max_vertices = GL_MAX_GEOMETRY_OUTPUT_VERTICES) out;
-
-const mat2 rot = mat2(1);
+flat in ivec3 pos[];
+flat in mat2 rot[];
+flat in float tpos[];
 
+layout(lines) in;
+layout(triangle_strip, max_vertices = 10) out;
 include(`networkCommon.glsl')
 
-mat2
-getRot(float angle)
-{
-	return mat2(cos(angle), sin(angle), -sin(angle), cos(angle));
-}
-
 void
 main()
 {
-	float segs = clamp(round(reps[0] * radius[0] / 1000), 4,
-			min(floor(uint(GL_MAX_GEOMETRY_OUTPUT_VERTICES) / (profileLength * 2u)),
-					floor(uint(GL_MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS) / 5u)));
-	vec3 arcstep = vec3((bangle[0] - aangle[0]), // angle
-						   reps[0], // texture
-						   (bpos[0].z - apos[0].z)) // height
-			/ segs;
-
-	ivec3 prevPos = apos[0];
-	mat2 prevRot = getRot(aangle[0]);
-	float prevTex = 0;
-	for (vec3 arc = arcstep; arc.y < reps[0] - 0.01; arc += arcstep) {
-		mat2 rot = getRot(arc.x + aangle[0]);
-		ivec3 pos = cpos[0] + ivec3(rot * vec2(radius[0], 0), arc.z);
-		float tex = arc.y;
-		doSeg(segDist(prevPos, pos), pos, prevPos, tex, prevTex, rot, prevRot);
-		prevPos = pos;
-		prevRot = rot;
-		prevTex = tex;
-	}
-	doSeg(segDist(prevPos, bpos[0]), bpos[0], prevPos, reps[0], prevTex, getRot(bangle[0]), prevRot);
+	doSeg(segDist(pos[0], pos[1]), pos[0], pos[1], tpos[0], tpos[1], rot[0], rot[1]);
 }
-- 
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