44 lines
1.0 KiB
Plaintext
44 lines
1.0 KiB
Plaintext
|
layout (location = 1) uniform float u_alpha;
|
||
|
|
|
||
|
|
layout (location = 0) in vec2 i_pos;
|
||
|
|
layout (location = 1) in vec2 i_size;
|
||
|
|
layout (location = 2) in vec2 i_uv_pos;
|
||
|
|
layout (location = 3) in vec2 i_uv_size;
|
||
|
|
layout (location = 4) in vec4 i_color;
|
||
|
|
|
||
|
|
out vec2 v_dp;
|
||
|
|
out vec2 v_uv;
|
||
|
|
out vec4 v_color;
|
||
|
|
|
||
|
|
const float RANDOM_POS = .1;
|
||
|
|
|
||
|
|
float rand(in vec2 p) {
|
||
|
|
/* https://qiita.com/shimacpyon/items/d15dee44a0b8b3883f76 */
|
||
|
|
return fract(sin(dot(p ,vec2(12.9898,78.233))) * 43758.5453);
|
||
|
|
}
|
||
|
|
|
||
|
|
void main(void) {
|
||
|
|
const vec2[] verts = vec2[](
|
||
|
|
vec2( 0., 0.), vec2( 0., -1.), vec2( 1., -1.),
|
||
|
|
vec2( 0., 0.), vec2( 1., -1.), vec2( 1., 0.)
|
||
|
|
);
|
||
|
|
|
||
|
|
vec2 seed = i_pos + float(gl_InstanceID);
|
||
|
|
|
||
|
|
vec2 rpos = 1.-vec2(rand(seed.xy), rand(seed.yx))*2.;
|
||
|
|
rpos.x /= 8.;
|
||
|
|
rpos.y = -abs(rpos.y);
|
||
|
|
|
||
|
|
float t = pow(1.-u_alpha, 4.);
|
||
|
|
|
||
|
|
rpos *= t*RANDOM_POS;
|
||
|
|
|
||
|
|
vec2 p = gl_VertexID < verts.length()? verts[gl_VertexID]: vec2(0.);
|
||
|
|
vec2 dp = p*i_size + i_pos+rpos;
|
||
|
|
|
||
|
|
gl_Position = vec4(dp, 0, 1);
|
||
|
|
v_dp = dp;
|
||
|
|
v_uv = p*i_uv_size + i_uv_pos;
|
||
|
|
v_color = i_color;
|
||
|
|
}
|