bgfx/examples/04-mesh/vs_mesh.sc

$input a_position, a_normal
$output v_pos, v_view, v_normal, v_color0

/*
 * Copyright 2011-2023 Branimir Karadzic. All rights reserved.
 * License: https://github.com/bkaradzic/bgfx/blob/master/LICENSE
 */

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

uniform vec4 u_time;

void main()
{
	vec3 pos = a_position;

	float sx = sin(pos.x*32.0+u_time.x*4.0)*0.5+0.5;
	float cy = cos(pos.y*32.0+u_time.x*4.0)*0.5+0.5;
	vec3 displacement = vec3(sx, cy, sx*cy);
	vec3 normal = a_normal.xyz*2.0 - 1.0;

	pos = pos + normal*displacement*vec3(0.06, 0.06, 0.06);

	gl_Position = mul(u_modelViewProj, vec4(pos, 1.0) );
	v_pos = gl_Position.xyz;
	v_view = mul(u_modelView, vec4(pos, 1.0) ).xyz;

	v_normal = mul(u_modelView, vec4(normal, 0.0) ).xyz;

	float len = length(displacement)*0.4+0.6;
	v_color0 = vec4(len, len, len, 1.0);
}