From b480e0a9b9ed764dba3790eee6f89eb775495698 Mon Sep 17 00:00:00 2001
From: NatureFreshMilk <naturefreshmilk@github.com>
Date: Thu, 17 Jan 2019 14:51:48 +0100
Subject: [PATCH] multithreaded

---
 initialrenderer/renderer.go | 52 +++++++++++++++++++++++--------------
 1 file changed, 33 insertions(+), 19 deletions(-)

diff --git a/initialrenderer/renderer.go b/initialrenderer/renderer.go
index 47134da..2987835 100644
--- a/initialrenderer/renderer.go
+++ b/initialrenderer/renderer.go
@@ -9,6 +9,12 @@ import (
 
 )
 
+func worker(tr *tilerenderer.TileRenderer, jobs <-chan coords.TileCoords){
+  for coord := range(jobs){
+    tr.Render(coord)
+  }
+}
+
 func Render(tr *tilerenderer.TileRenderer,
   layers []layerconfig.Layer){
 
@@ -16,33 +22,22 @@ func Render(tr *tilerenderer.TileRenderer,
     complete_count := 512*512
     current_count := 0
 
-    for _, layer := range(layers) {
+    jobs := make(chan coords.TileCoords, 100)
 
-    	// zoom:1 == length=1
-    	// zoom:2 == length=2
-    	// zoom:3 == length=4
-    	// zoom:4 == length=8
-    	// zoom:5 == length=16
-    	// zoom:6 == length=32
-    	// zoom:7 == length=64
-    	// zoom:8 == length=128
-    	// zoom:9 == length=256
-    	// zoom:10 == length=512
-    	// zoom:11 == length=1024
-    	// zoom:12 == length=2048
-    	// zoom:13 == length=4096
+    go worker(tr, jobs)
+    go worker(tr, jobs)
+    go worker(tr, jobs)
+    go worker(tr, jobs)
+
+    for _, layer := range(layers) {
 
     	//zoom 10 iterator
     	for x := -255; x<256; x++ {
     		for y := -255; y<256; y++ {
     			tc := coords.NewTileCoords(x,y,10,layer.Id)
-    			_, err := tr.Render(tc)
+          jobs <- tc
           current_count++
 
-    			if err != nil {
-    				panic(err)
-    			}
-
           if time.Now().Sub(start).Seconds() > 2 {
             start = time.Now()
             progress := float64(current_count) / float64(complete_count) * 100
@@ -59,5 +54,24 @@ func Render(tr *tilerenderer.TileRenderer,
     		}
     	}
 
+
     }
+
+    close(jobs)
+
 }
+
+
+// zoom:1 == length=1
+// zoom:2 == length=2
+// zoom:3 == length=4
+// zoom:4 == length=8
+// zoom:5 == length=16
+// zoom:6 == length=32
+// zoom:7 == length=64
+// zoom:8 == length=128
+// zoom:9 == length=256
+// zoom:10 == length=512
+// zoom:11 == length=1024
+// zoom:12 == length=2048
+// zoom:13 == length=4096