From 892513f81ed68e05d4dedb99f51de5bc46cab6b2 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sun, 28 Jan 2024 02:25:11 +0000
Subject: Geometry shader for single pass shadow maps

2D array texture, 4 levels, geometry shader outputs to each layer for a specific band, single
scene rendering.

Pending massive tidy up.
---
 gfx/gl/shaders/commonShadowPoint.gs | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 gfx/gl/shaders/commonShadowPoint.gs

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

diff --git a/gfx/gl/shaders/commonShadowPoint.gs b/gfx/gl/shaders/commonShadowPoint.gs
new file mode 100644
index 0000000..b008f29
--- /dev/null
+++ b/gfx/gl/shaders/commonShadowPoint.gs
@@ -0,0 +1,22 @@
+#version 330 core
+#extension GL_ARB_viewport_array : enable
+
+uniform mat4 viewProjection[4];
+uniform int viewProjections;
+in vec4 vworldPos[];
+layout(triangles) in;
+layout(triangle_strip, max_vertices = 12) out;
+
+void
+main()
+{
+	for (int vp = 0; vp < viewProjections; ++vp) {
+		for (int v = 0; v < vworldPos.length(); ++v) {
+			gl_Position = viewProjection[vp] * vworldPos[v];
+			gl_Position.z = max(gl_Position.z, -1);
+			gl_Layer = vp;
+			EmitVertex();
+		}
+		EndPrimitive();
+	}
+}
-- 
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