[RELEASE] u22-v04

This version is submitted for U22 final presentation. (squashed 158 commits)

core/loshader/popup_text.vshader

@@ -0,0 +1,43 @@
+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;
+}