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renderer_cache_hash.diff
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99 lines (97 loc) · 2.99 KB
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diff --git a/src/library_gl.js b/src/library_gl.js
index 4bce0ef..094a961 100644
--- a/src/library_gl.js
+++ b/src/library_gl.js
@@ -1386,6 +1386,7 @@ var LibraryGL = {
mode: 0,
rendererCache: {},
+ rendererCacheTemp: [], // temporary item for renderer cache lookups
rendererComponents: {}, // small cache for calls inside glBegin/end. counts how many times the element was seen
rendererComponentPointer: 0, // next place to start a glBegin/end component
lastRenderer: null, // used to avoid cleaning up and re-preparing the same renderer
@@ -1520,9 +1521,71 @@ var LibraryGL = {
},
getRenderer: function() {
- // return a renderer object given the liveClientAttributes
- // we maintain a cache of renderers, optimized to not generate garbage
+ // return a renderer object given the liveClientAttributes and other relevant information about rendering state
var attributes = GL.immediate.liveClientAttributes;
+
+
+
+
+
+ var temp = GL.immediate.rendererCacheTemp;
+ temp.length = 0;
+ var hash = 1000;
+ var salt = 0x0149F37A;
+ function add(value) {
+ temp.push(value);
+ hash = (hash*(value+3))^salt;
+ }
+ for (var i = 0; i < attributes.length; i++) {
+ var attribute = attributes[i];
+ add(attribute.name);
+ add(attribute.size);
+ add(attribute.type);
+ }
+ add(GLEmulation.fogEnabled ? GLEmulation.fogMode : 0);
+ if (GL.currProgram) { // Note the order here; this one is last, and optional
+ add(GL.currProgram);
+ }
+ var cache = GL.immediate.rendererCache;
+ function isCorrect(item) {
+ if (item.hash != hash) return false;
+ if (item.id.length != temp.length) return false;
+ var length = temp.length;
+ var existing = item.id;
+ for (var i = 0; i < length; i++) {
+ if (existing[i] != temp[i]) {
+ return false;
+ }
+ }
+ return true;
+ }
+ var seek = hash;
+ var item;
+ while ((item = cache[seek]) && !isCorrect(item)) {
+ Module.printErr('cache collision!');
+ seek++;
+ }
+ if (item) return item.renderer;
+#if GL_DEBUG
+ Module.printErr('generating renderer for ' + JSON.stringify(attributes));
+#endif
+ var renderer = this.createRenderer();
+ cache[seek] = {
+ id: temp.slice(0),
+ hash: hash,
+ renderer: renderer
+ };
+ return renderer;
+
+
+
+
+
+
+
+
+
+ // we maintain a cache of renderers, optimized to not generate garbage
var cacheItem = GL.immediate.rendererCache;
for (var i = 0; i < attributes.length; i++) {
var attribute = attributes[i];
@@ -1544,6 +1607,12 @@ var LibraryGL = {
if (!cacheItem[GL.currProgram]) cacheItem[GL.currProgram] = {};
cacheItem = cacheItem[GL.currProgram];
}
+
+
+
+
+
+
if (!cacheItem.renderer) {
#if GL_DEBUG
Module.printErr('generating renderer for ' + JSON.stringify(attributes));