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/**
* @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;
#if HAS_ATTRIBUTE_TANGENT == 1
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);
#if HAS_ATTRIBUTE_TANGENT == 1
tangent_g = get_screen_normal(position.xyz, world_pos, tangent.xyz, mat);
#endif
}
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