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#version 310 es
/* Rectangle position */
layout(location=1) uniform vec2 u_pos;
/* Rectangle size */
layout(location=2) uniform vec2 u_size;
/* Window size */
layout(location=3) uniform vec2 u_win;
layout(location=0) in vec4 v_pos;
void main()
{
vec2 size = 2.0 * u_size / u_win;
vec2 pos = vec2 (-1.0 + 2.0 * (u_pos.x / u_win.x),
1.0 - 2.0 * (u_pos.y / u_win.y));
mat4 scale = mat4(size.x, 0.0, 0.0, 0.0,
0.0, size.y, 0.0, 0.0,
0.0, 0.0, 1.0, 0.0,
0.0, 0.0, 0.0, 1.0);
mat4 translate = mat4(1.0, 0.0, 0.0, 0.0,
0.0, 1.0, 0.0, 0.0,
0.0, 0.0, 1.0, 0.0,
pos.x, pos.y, 0.0, 1.0);
gl_Position = translate * scale * v_pos;
}
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