1 files changed, 74 insertions, 0 deletions
diff --git a/indra/newview/app_settings/shaders/class1/interface/normaldebugV.glsl b/indra/newview/app_settings/shaders/class1/interface/normaldebugV.glsl
new file mode 100644
index 0000000000..ae726190c7
--- /dev/null
+++ b/indra/newview/app_settings/shaders/class1/interface/normaldebugV.glsl
@@ -0,0 +1,74 @@
+/**
+ * @file normaldebugV.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
+ * $/LicenseInfo$
+ */
+
+in vec3 position;
+in vec3 normal;
+out vec4 normal_g;
+#ifdef HAS_ATTRIBUTE_TANGENT
+in vec4 tangent;
+out vec4 tangent_g;
+#endif
+
+uniform float debug_normal_draw_length;
+
+#ifdef HAS_SKIN
+mat4 getObjectSkinnedTransform();
+#else
+uniform mat3 normal_matrix;
+#endif
+uniform mat4 projection_matrix;
+uniform mat4 modelview_matrix;
+
+// *NOTE: Should use the modelview_projection_matrix here in the non-skinned
+// case for efficiency, but opting for the simplier implementation for now as
+// this is debug code. Also, the skinned version hasn't beeen tested yet.
+// world_pos = mat * vec4(position.xyz, 1.0)
+vec4 get_screen_normal(vec3 position, vec4 world_pos, vec3 normal, mat4 mat)
+{
+    vec4 world_norm = mat * vec4((position + normal), 1.0);
+    world_norm.xyz -= world_pos.xyz;
+    world_norm.xyz = debug_normal_draw_length * normalize(world_norm.xyz);
+    world_norm.xyz += world_pos.xyz;
+    return projection_matrix * world_norm;
+}
+
+void main()
+{
+#ifdef HAS_SKIN
+    mat4 mat = getObjectSkinnedTransform();
+    mat = modelview_matrix * mat;
+#else
+#define mat modelview_matrix
+#endif
+
+    vec4 world_pos = mat * vec4(position.xyz,1.0);
+
+    gl_Position = projection_matrix * world_pos;
+    normal_g = get_screen_normal(position.xyz, world_pos, normal.xyz, mat);
+#ifdef HAS_ATTRIBUTE_TANGENT
+    tangent_g = get_screen_normal(position.xyz, world_pos, tangent.xyz, mat);
+#endif
+}
+