bgfx/examples/18-ibl/vs_ibl_skybox.sc

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$input a_position, a_texcoord0
$output v_dir
/*
* Copyright 2014-2016 Dario Manesku. All rights reserved.
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* License: https://github.com/bkaradzic/bgfx#license-bsd-2-clause
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*/
#include "../common/common.sh"
#include "uniforms.sh"
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uniform mat4 u_mtx;
void main()
{
gl_Position = mul(u_modelViewProj, vec4(a_position, 1.0) );
float fov = 45.0;
float height = tan(fov*0.5);
float aspect = height*(4.0/3.0);
vec2 tex = (2.0*a_texcoord0-1.0) * vec2(aspect, height);
mat4 mtx;
mtx[0] = u_mtx0;
mtx[1] = u_mtx1;
mtx[2] = u_mtx2;
mtx[3] = u_mtx3;
v_dir = instMul(mtx, vec4(tex, 1.0, 0.0) ).xyz;
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}