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/**
* @file class1\environment\pbrterrainV.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
* $/LicenseInfo$
*/
uniform mat3 normal_matrix;
uniform mat4 texture_matrix0;
uniform mat4 modelview_matrix;
uniform mat4 modelview_projection_matrix;
in vec3 position;
in vec3 normal;
in vec4 tangent;
in vec4 diffuse_color;
in vec2 texcoord1;
#if TERRAIN_PLANAR_TEXTURE_SAMPLE_COUNT == 3
out vec4[2] vary_coords;
#endif
out vec3 vary_vertex_normal; // Used by pbrterrainUtilF.glsl
out vec3 vary_normal;
out vec3 vary_tangent;
flat out float vary_sign;
out vec4 vary_texcoord0;
out vec4 vary_texcoord1;
out vec3 vary_position;
// *HACK: tangent_space_transform should use texture_normal_transform, or maybe
// we shouldn't use tangent_space_transform at all. See the call to
// tangent_space_transform below.
uniform vec4[2] texture_base_color_transform;
vec2 terrain_texture_transform(vec2 vertex_texcoord, vec4[2] khr_gltf_transform);
vec3 terrain_tangent_space_transform(vec4 vertex_tangent, vec3 vertex_normal, vec4[2] khr_gltf_transform);
void main()
{
//transform vertex
gl_Position = modelview_projection_matrix * vec4(position.xyz, 1.0);
vary_position = (modelview_matrix*vec4(position.xyz, 1.0)).xyz;
vec3 n = normal_matrix * normal;
vary_vertex_normal = normal;
vec3 t = normal_matrix * tangent.xyz;
vary_tangent = normalize(t);
// *TODO: Decide if we want this. It may be better to just calculate the
// tangents on-the-fly in the fragment shader, due to the subtleties of the
// effect of triplanar mapping on UVs.
// *HACK: Should be using texture_normal_transform here. The KHR texture
// transform spec requires handling texture transforms separately for each
// individual texture.
vary_tangent = normalize(terrain_tangent_space_transform(vec4(t, tangent.w), n, texture_base_color_transform));
vary_sign = tangent.w;
vary_normal = normalize(n);
// Transform and pass tex coords
// *HACK: texture_base_color_transform is used for all of these here, but
// the KHR texture transform spec requires handling texture transforms
// separately for each individual texture.
#if TERRAIN_PLANAR_TEXTURE_SAMPLE_COUNT == 3
// xy
vary_coords[0].xy = terrain_texture_transform(position.xy, texture_base_color_transform);
// yz
vary_coords[0].zw = terrain_texture_transform(position.yz, texture_base_color_transform);
// (-x)z
vary_coords[1].xy = terrain_texture_transform(position.xz * vec2(-1, 1), texture_base_color_transform);
#elif TERRAIN_PLANAR_TEXTURE_SAMPLE_COUNT == 1
vary_texcoord0.xy = terrain_texture_transform(position.xy, texture_base_color_transform);
#endif
vec4 tc = vec4(texcoord1,0,1);
vary_texcoord0.zw = tc.xy;
vary_texcoord1.xy = tc.xy-vec2(2.0, 0.0);
vary_texcoord1.zw = tc.xy-vec2(1.0, 0.0);
}
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