git subrepo clone (merge) https://github.com/HarbourMasters/otrgui.git OTRGui

subrepo:
  subdir:   "OTRGui"
  merged:   "a6066a251"
upstream:
  origin:   "https://github.com/HarbourMasters/otrgui.git"
  branch:   "master"
  commit:   "a6066a251"
git-subrepo:
  version:  "0.4.1"
  origin:   "???"
  commit:   "???"

OTRGui/libs/raylib/examples/others/resources/shaders/glsl330/point_particle.fs

@@ -0,0 +1,17 @@
+#version 330
+
+// Input uniform values
+uniform vec4 color;
+
+// Output fragment color
+out vec4 finalColor;
+
+// NOTE: Add here your custom variables
+
+void main()
+{
+    // Each point is drawn as a screen space square of gl_PointSize size. gl_PointCoord contains where we are inside of
+    // it. (0, 0) is the top left, (1, 1) the bottom right corner.
+    // Draw each point as a colored circle with alpha 1.0 in the center and 0.0 at the outer edges.
+    finalColor = vec4(color.rgb, color.a * (1 - length(gl_PointCoord.xy - vec2(0.5))*2));
+}

OTRGui/libs/raylib/examples/others/resources/shaders/glsl330/point_particle.vs

@@ -0,0 +1,24 @@
+#version 330
+
+// Input vertex attributes
+in vec3 vertexPosition;
+
+// Input uniform values
+uniform mat4 mvp;
+uniform float currentTime;
+
+// NOTE: Add here your custom variables
+
+void main()
+{
+    // Unpack data from vertexPosition
+    vec2  pos    = vertexPosition.xy;
+    float period = vertexPosition.z;
+
+    // Calculate final vertex position (jiggle it around a bit horizontally)
+    pos += vec2(100, 0) * sin(period * currentTime);
+    gl_Position = mvp * vec4(pos, 0.0, 1.0);
+
+    // Calculate the screen space size of this particle (also vary it over time)
+    gl_PointSize = 10 - 5 * abs(sin(period * currentTime));
+}