gecko/devtools/server/primitive.js

165 lines
4.2 KiB
JavaScript

/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
const { on, once, off, emit } = require("sdk/event/core");
const { Class } = require("sdk/core/heritage");
const WebGLPrimitivesType = {
"POINTS": 0,
"LINES": 1,
"LINE_LOOP": 2,
"LINE_STRIP": 3,
"TRIANGLES": 4,
"TRIANGLE_STRIP": 5,
"TRIANGLE_FAN": 6
};
/**
* A utility for monitoring WebGL primitive draws. Takes a `tabActor`
* and monitors primitive draws over time.
*/
const WebGLDrawArrays = "drawArrays";
const WebGLDrawElements = "drawElements";
var WebGLPrimitiveCounter = exports.WebGLPrimitiveCounter = Class({
initialize: function(tabActor) {
this.tabActor = tabActor;
},
destroy: function() {
this.stopRecording();
},
/**
* Starts monitoring primitive draws, storing the primitives count per tick.
*/
resetCounts: function() {
this._tris = 0;
this._vertices = 0;
this._points = 0;
this._lines = 0;
this._startTime = this.tabActor.docShell.now();
},
/**
* Stops monitoring primitive draws, returning the recorded values.
*/
getCounts: function() {
var result = {
tris: this._tris,
vertices: this._vertices,
points: this._points,
lines: this._lines
};
this._tris = 0;
this._vertices = 0;
this._points = 0;
this._lines = 0;
return result;
},
/**
* Handles WebGL draw primitive functions to catch primitive info.
*/
handleDrawPrimitive: function(functionCall) {
let { name, args } = functionCall.details;
if (name === WebGLDrawArrays) {
this._processDrawArrays(args);
} else if (name === WebGLDrawElements) {
this._processDrawElements(args);
}
},
/**
* Processes WebGL drawArrays method to count primitve numbers
*/
_processDrawArrays: function(args) {
let mode = args[0];
let count = args[2];
switch ( mode ) {
case WebGLPrimitivesType.POINTS:
this._vertices += count;
this._points += count;
break;
case WebGLPrimitivesType.LINES:
this._vertices += count;
this._lines += (count / 2);
break;
case WebGLPrimitivesType.LINE_LOOP:
this._vertices += count;
this._lines += count;
break;
case WebGLPrimitivesType.LINE_STRIP:
this._vertices += count;
this._lines += (count - 1);
break;
case WebGLPrimitivesType.TRIANGLES:
this._tris += (count / 3);
this._vertices += count;
break;
case WebGLPrimitivesType.TRIANGLE_STRIP:
this._tris += (count - 2);
this._vertices += count;
break;
case WebGLPrimitivesType.TRIANGLE_FAN:
this._tris += (count - 2);
this._vertices += count;
break;
default:
console.error("_processDrawArrays doesn't define this type.");
break;
}
},
/**
* Processes WebGL drawElements method to count primitve numbers
*/
_processDrawElements: function(args) {
let mode = args[0];
let count = args[1];
switch ( mode ) {
case WebGLPrimitivesType.POINTS:
this._vertices += count;
this._points += count;
break;
case WebGLPrimitivesType.LINES:
this._vertices += count;
this._lines += (count / 2);
break;
case WebGLPrimitivesType.LINE_LOOP:
this._vertices += count;
this._lines += count;
break;
case WebGLPrimitivesType.LINE_STRIP:
this._vertices += count;
this._lines += (count - 1);
break;
case WebGLPrimitivesType.TRIANGLES:
let tris = count / 3;
let vertex = tris * 3;
if (tris > 1) {
vertex = tris * 2;
}
this._tris += tris;
this._vertices += vertex;
break;
case WebGLPrimitivesType.TRIANGLE_STRIP:
this._tris += (count - 2);
this._vertices += count;
break;
case WebGLPrimitivesType.TRIANGLE_FAN:
this._tris += (count - 2);
this._vertices += count;
default:
console.error("_processDrawElements doesn't define this type.");
break;
}
}
});