45 lines
1.1 KiB
Scala
45 lines
1.1 KiB
Scala
$input a_position, a_normal, a_tangent, a_texcoord0
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$output v_wpos, v_view, v_normal, v_tangent, v_bitangent, v_texcoord0
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/*
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* Copyright 2011-2020 Branimir Karadzic. All rights reserved.
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* License: https://github.com/bkaradzic/bgfx#license-bsd-2-clause
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*/
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#include "../common/common.sh"
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mat3 mtx3FromCols(vec3 c0, vec3 c1, vec3 c2)
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{
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#ifdef BGFX_SHADER_LANGUAGE_GLSL
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return mat3(c0, c1, c2);
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#else
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return transpose(mat3(c0, c1, c2));
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#endif
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}
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void main()
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{
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vec3 wpos = mul(u_model[0], vec4(a_position, 1.0) ).xyz;
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v_wpos = wpos;
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gl_Position = mul(u_viewProj, vec4(wpos, 1.0) );
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vec4 normal = a_normal * 2.0 - 1.0;
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vec4 tangent = a_tangent * 2.0 - 1.0;
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vec3 wnormal = mul(u_model[0], vec4(normal.xyz, 0.0) ).xyz;
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vec3 wtangent = mul(u_model[0], vec4(tangent.xyz, 0.0) ).xyz;
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v_normal = normalize(wnormal);
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v_tangent = normalize(wtangent);
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v_bitangent = cross(v_normal, v_tangent) * tangent.w;
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mat3 tbn = mtx3FromCols(v_tangent, v_bitangent, v_normal);
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// eye position in world space
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vec3 weyepos = mul(vec4(0.0, 0.0, 0.0, 1.0), u_view).xyz;
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// tangent space view dir
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v_view = mul(weyepos - wpos, tbn);
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v_texcoord0 = a_texcoord0;
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}
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