Use triangles to draw points with WebGL

src/ol/renderer/webgl/webglvectorlayer.glsl

@@ -4,20 +4,19 @@
 
 //! COMMON
 
-
 //! VERTEX
 attribute vec2 a_position;
+attribute vec2 a_offsets;
 
 uniform mat4 u_projectionMatrix;
 
 void main(void) {
-  gl_PointSize = 10.0;
-  gl_Position = u_projectionMatrix * vec4(a_position, 0., 1.);
+  gl_Position = u_projectionMatrix * vec4(a_position, 0., 1.) + vec4(a_offsets, 0., 0.);
 }
 
 
 //! FRAGMENT
 
 void main(void) {
-  gl_FragColor = vec4(1.0, 1.0, 0.0, 0.7);
+  gl_FragColor = vec4(1.0, 1.0, 0.0, 1);
 }