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+/**
+ * @file normaldebugG.glsl
+ *
+ * $LicenseInfo:firstyear=2023&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2023, Linden Research, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
+ * $/LicenseInfo$
+ */
+
+// *NOTE: Geometry shaders have a reputation for being slow. Consider using
+// compute shaders instead, which have a reputation for being fast. This
+// geometry shader in particular seems to run fine on my machine, but I won't
+// vouch for this in performance-critical areas.
+// -Cosmic,2023-09-28
+
+out vec4 vertex_color;
+
+in vec4 normal_g[];
+#ifdef HAS_ATTRIBUTE_TANGENT
+in vec4 tangent_g[];
+#endif
+
+layout(triangles) in;
+#ifdef HAS_ATTRIBUTE_TANGENT
+layout(line_strip, max_vertices = 12) out;
+#else
+layout(line_strip, max_vertices = 6) out;
+#endif
+
+void triangle_normal_debug(int i)
+{
+ // Normal
+ vec4 normal_color = vec4(1.0, 1.0, 0.0, 1.0);
+ gl_Position = gl_in[i].gl_Position;
+ vertex_color = normal_color;
+ EmitVertex();
+ gl_Position = normal_g[i];
+ vertex_color = normal_color;
+ EmitVertex();
+ EndPrimitive();
+
+#ifdef HAS_ATTRIBUTE_TANGENT
+ // Tangent
+ vec4 tangent_color = vec4(0.0, 1.0, 1.0, 1.0);
+ gl_Position = gl_in[i].gl_Position;
+ vertex_color = tangent_color;
+ EmitVertex();
+ gl_Position = tangent_g[i];
+ vertex_color = tangent_color;
+ EmitVertex();
+ EndPrimitive();
+#endif
+}
+
+void main()
+{
+ triangle_normal_debug(0);
+ triangle_normal_debug(1);
+ triangle_normal_debug(2);
+}