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.

1 files changed, 22 insertions, 0 deletions

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();
+	}
+}