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#version 150 core
in vec3 a_vertex;
out float v_h;
uniform sampler2D terrain;
uniform float time;
uniform int numcubes;
void main()
{
float oneovernumcubes = 1.f / float(numcubes);
vec2 uv = vec2(mod(gl_InstanceID, numcubes), floor(gl_InstanceID * oneovernumcubes)) * 2.0 * oneovernumcubes;
vec3 v = a_vertex * oneovernumcubes - (1.0 - oneovernumcubes);
v.xz += uv;
v_h = texture(terrain, uv * 0.5 + vec2(sin(time * 0.04), time * 0.02)).r * 2.0 / 3.0;
if(a_vertex.y > 0.0)
v.y += v_h;
gl_Position = vec4(v, 1.0);
}
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