mirror of
https://github.com/scratchfoundation/bgfx.git
synced 2024-12-04 21:31:11 -05:00
31 lines
834 B
Text
31 lines
834 B
Text
|
#version 300 es
|
||
|
out mediump vec4 _fragData;
|
||
|
uniform highp float _Speed;
|
||
|
uniform highp vec4 _Time;
|
||
|
highp vec4 func( in highp vec2 uv )
|
||
|
{
|
||
|
highp float s = sin(_Speed * _Time.x);
|
||
|
highp float c = cos(_Speed * _Time.x);
|
||
|
|
||
|
highp mat2 rotationMatrix = mat2(c, s, -s, c);
|
||
|
// various operations on a matrix
|
||
|
rotationMatrix = rotationMatrix * 2.0;
|
||
|
rotationMatrix = rotationMatrix - 1.0;
|
||
|
rotationMatrix = s - rotationMatrix;
|
||
|
rotationMatrix = c + rotationMatrix;
|
||
|
rotationMatrix /= s;
|
||
|
|
||
|
mediump mat2 halfMatrix = mat2(c, s, -s, c);
|
||
|
halfMatrix = halfMatrix * 2.0;
|
||
|
halfMatrix = halfMatrix - 1.0;
|
||
|
halfMatrix = s - halfMatrix;
|
||
|
halfMatrix = c + halfMatrix;
|
||
|
halfMatrix /= s;
|
||
|
|
||
|
return vec4((rotationMatrix * uv), (halfMatrix * uv));
|
||
|
}
|
||
|
in highp vec2 uv;
|
||
|
void main() {
|
||
|
_fragData = func(uv);
|
||
|
}
|