27 lines
519 B
Text
27 lines
519 B
Text
|
#ifdef GL_ES
|
||
|
|
precision mediump float;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
attribute vec2 a_pos;
|
||
|
|
|
||
|
|
uniform vec4 u_viewbox; // [x, y, width, height]
|
||
|
|
uniform vec2 u_resolution;
|
||
|
|
|
||
|
|
varying vec2 v_pos;
|
||
|
|
|
||
|
|
void main() {
|
||
|
|
|
||
|
|
vec2 uv = (a_pos.xy + 1.0) * 0.5;
|
||
|
|
uv = 1.0 - uv;
|
||
|
|
// uv *= -1.0;
|
||
|
|
|
||
|
|
// Viewbox's center is top left, a_position's is in the center to the screen
|
||
|
|
// So translate and scale the viewbox**
|
||
|
|
uv *= u_viewbox.zw;
|
||
|
|
uv -= u_viewbox.xy + u_viewbox.zw;
|
||
|
|
|
||
|
|
v_pos = uv.xy;
|
||
|
|
|
||
|
|
gl_Position = vec4(a_pos, 0.0, 1.0);
|
||
|
|
}
|