planet-wars/frontend/www/static/shaders/vert/simple.glsl

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2019-09-17 20:19:04 +02:00
#ifdef GL_ES
precision mediump float;
#endif
attribute vec2 a_position;
uniform vec4 u_viewbox; // [x, y, width, height]
uniform vec2 u_resolution;
varying vec2 v_pos;
void main() {
vec2 uv = ( a_position.xy + 1.0 ) * 0.5;
uv *= u_viewbox.zw;
uv += u_viewbox.xy;
v_pos = uv.xy;
gl_Position = vec4(a_position.xy, 0.0, 1.0);
}