Extend linestring renderer with GLSL and indexed geometries.

src/ol/render/webgl/webgllinestringdefault.glsl

@@ -0,0 +1,34 @@
+//! NAMESPACE=ol.render.webgl.linestringreplay.shader.Default
+//! CLASS=ol.render.webgl.linestringreplay.shader.Default
+
+
+//! COMMON
+
+
+//! VERTEX
+attribute vec2 a_position;
+
+uniform mat4 u_projectionMatrix;
+uniform mat4 u_offsetScaleMatrix;
+uniform mat4 u_offsetRotateMatrix;
+
+void main(void) {
+  mat4 offsetMatrix = u_offsetScaleMatrix;
+  vec4 offsets = offsetMatrix * vec4(0., 0., 0., 0.);
+  gl_Position = u_projectionMatrix * vec4(a_position, 0., 1.) + offsets;
+}
+
+
+//! FRAGMENT
+
+uniform float u_opacity;
+uniform vec4 u_color;
+
+void main(void) {
+  gl_FragColor = u_color;
+  float alpha = u_color.a * u_opacity;
+  if (alpha == 0.0) {
+    discard;
+  }
+  gl_FragColor.a = alpha;
+}