bgfx/examples/27-terrain/vs_terrain_height_texture.sc

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$input a_position, a_texcoord0
$output v_position, v_texcoord0
/*
* Copyright 2015 Andrew Mac. All rights reserved.
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* License: https://github.com/bkaradzic/bgfx/blob/master/LICENSE
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*/
#include "../common/common.sh"
SAMPLER2D(s_heightTexture, 0);
void main()
{
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v_texcoord0 = a_texcoord0;
v_position = a_position.xyz;
v_position.y = texture2DLod(s_heightTexture, a_texcoord0, 0).x * 255.0;
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gl_Position = mul(u_modelViewProj, vec4(v_position.xyz, 1.0));
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}