Clean up WebGL provides

src/ol/render/webgl/imagereplay/defaultshader.glsl

@@ -0,0 +1,44 @@
+//! NAMESPACE=ol.renderer.webgl.imagereplay.defaultshader
+//! CLASS=ol.renderer.webgl.imagereplay.defaultshader
+
+
+//! COMMON
+varying vec2 v_texCoord;
+varying float v_opacity;
+
+//! VERTEX
+attribute vec2 a_position;
+attribute vec2 a_texCoord;
+attribute vec2 a_offsets;
+attribute float a_opacity;
+attribute float a_rotateWithView;
+
+uniform mat4 u_projectionMatrix;
+uniform mat4 u_offsetScaleMatrix;
+uniform mat4 u_offsetRotateMatrix;
+
+void main(void) {
+  mat4 offsetMatrix = u_offsetScaleMatrix;
+  if (a_rotateWithView == 1.0) {
+    offsetMatrix = u_offsetScaleMatrix * u_offsetRotateMatrix;
+  }
+  vec4 offsets = offsetMatrix * vec4(a_offsets, 0., 0.);
+  gl_Position = u_projectionMatrix * vec4(a_position, 0., 1.) + offsets;
+  v_texCoord = a_texCoord;
+  v_opacity = a_opacity;
+}
+
+
+//! FRAGMENT
+uniform float u_opacity;
+uniform sampler2D u_image;
+
+void main(void) {
+  vec4 texColor = texture2D(u_image, v_texCoord);
+  gl_FragColor.rgb = texColor.rgb;
+  float alpha = texColor.a * v_opacity * u_opacity;
+  if (alpha == 0.0) {
+    discard;
+  }
+  gl_FragColor.a = alpha;
+}