bgfx/examples/39-assao/vs_assao_gbuffer.sc

$input a_position, a_normal, a_texcoord0
$output v_normal, v_texcoord0

/*
 * Copyright 2018 Attila Kocsis. All rights reserved.
 * License: https://github.com/bkaradzic/bgfx/blob/master/LICENSE
 */


#include "../common/common.sh"

void main()
{
	// Calculate vertex position
	vec3 pos = a_position.xyz;
	gl_Position = mul(u_modelViewProj, vec4(pos, 1.0) );

	// Calculate normal.  Note that compressed normal is stored in the vertices
	vec3 normalObjectSpace = a_normal.xyz*2.0+-1.0; // Normal is stored in [0,1], remap to [-1,1].

	// Transform normal into world space.
	vec3 normalWorldSpace = mul(u_model[0], vec4(normalObjectSpace, 0.0) ).xyz;
	// Normalize to remove (uniform...) scaling, however, recompress
	v_normal.xyz = normalize(normalWorldSpace)*0.5+0.5;

	v_texcoord0 = a_texcoord0 * 16.0;
}