fix transparent tile in gl tilelayer

fuzhenn · fuzhenn · commit de5efedc6d2b · 2017-10-02T23:00:07.000+08:00
diff --git a/src/renderer/layer/tilelayer/TileLayerGLRenderer.js b/src/renderer/layer/tilelayer/TileLayerGLRenderer.js
@@ -181,6 +181,8 @@ class TileLayerGLRenderer extends TileLayerCanvasRenderer {
         this.posBuffer = this.createBuffer();
         gl.bindBuffer(gl.ARRAY_BUFFER, this.posBuffer);
         this.enableVertexAttrib(['a_position', 2]);
+
+        gl.pixelStorei(gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, true);
     }
 
     resizeCanvas(canvasSize) {

Original file line number	Diff line number	Diff line change
`@@ -181,6 +181,8 @@ class TileLayerGLRenderer extends TileLayerCanvasRenderer {`
`181`	`181`	`this.posBuffer = this.createBuffer();`
`182`	`182`	`gl.bindBuffer(gl.ARRAY_BUFFER, this.posBuffer);`
`183`	`183`	`this.enableVertexAttrib(['a_position', 2]);`
	`184`	`+`
	`185`	`+ gl.pixelStorei(gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, true);`
`184`	`186`	`}`
`185`	`187`
`186`	`188`	`resizeCanvas(canvasSize) {`