Merge remote-tracking branch 'origin/instanced-networks'

1 files changed, 43 insertions, 0 deletions

diff --git a/gfx/gl/shaders/networkCommon.glsl b/gfx/gl/shaders/networkCommon.glsl
new file mode 100644
index 0000000..0bc3c1c
--- /dev/null
+++ b/gfx/gl/shaders/networkCommon.glsl
@@ -0,0 +1,43 @@
+uniform vec3[10] profile;
+uniform float[10] texturePos;
+uniform uint profileLength;
+
+uniform mat4 viewProjection;
+uniform ivec3 viewPoint;
+
+uniform float clipDistance = 5000000;
+uniform float flatDistance = 1000000;
+
+out vec2 texCoord;
+out vec3 rposition;
+
+float
+segDist(const ivec3 a, const ivec3 b)
+{
+	return min(distance(viewPoint, a), distance(viewPoint, b));
+}
+
+ifelse(
+		TYPE, .gs,
+		// Begin: Geometry shader only function
+		void doVertex(const ivec3 end, const uint v, const float texY, const mat2 rot) {
+			ivec3 vpos = end + ivec3(rot * profile[v].xy, profile[v].z);
+			rposition = vpos - viewPoint;
+			gl_Position = viewProjection * vec4(rposition, 1);
+			texCoord = vec2(texturePos[v], texY);
+			EmitVertex();
+		}
+
+		void doSeg(const float dist, const ivec3 apos, const ivec3 bpos, const float atexY, const float btexY,
+				const mat2 arot, const mat2 brot) {
+			if (dist < clipDistance) {
+				uint vstep = (dist < flatDistance) ? 1u : profileLength - 1u;
+				for (uint v = 0u; v < profileLength; v += vstep) {
+					doVertex(bpos, v, btexY, brot);
+					doVertex(apos, v, atexY, arot);
+				}
+				EndPrimitive();
+			}
+		}
+		// End: Geometry shader only function
+)