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Issue 11667030: Add GPU memory usage contents browser test (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: Contents browser test ready for review Created 7 years, 11 months ago
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1 <!DOCTYPE HTML>
2 <html>
3 <head>
4 <title>GPU Memory Test: Use N MB of GPU Memory with WebGL</title>
5
6 <script id="vertex-shader" type="x-shader/x-vertex">
7 attribute vec2 a_position;
8 varying vec2 v_position;
9 void main() {
10 v_position = a_position;
11 gl_Position = vec4(a_position, 0, 1);
12 }
13 </script>
14
15 <script id="fragment-shader" type="x-shader/x-fragment">
16 precision mediump float;
17 uniform sampler2D u_image;
18 varying vec2 v_position;
19 void main() {
20 gl_FragColor = texture2D(u_image, v_position);
21 }
22 </script>
23
24 <script>
25 var gl = null;
26 var shaderProgram = null;
27 var textures = [];
28 var fbos = [];
29 var t = 0.0;
30 var n = 1;
31
32 // Create n textures of about 1MB each.
33 function useGpuMemory(mb_to_use)
34 {
35 n = mb_to_use;
36
37 var canvas = document.getElementById("canvas_id");
38 gl = canvas.getContext("experimental-webgl");
39 if (!gl) {
40 throw "Unable to fetch WebGL rendering context for Canvas";
41 }
42
43 // Create n textures that are each about 1MB and FBOs to render to them.
44 for (var i = 0; i < n; ++i) {
45 var texture = gl.createTexture();
46 var fbo = gl.createFramebuffer();
47 textures.push(texture);
48 fbos.push(fbo);
49
50 gl.bindTexture(gl.TEXTURE_2D, texture);
51 gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
52 gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
53 gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
54 gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
55 gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 512, 512, 0,
56 gl.RGBA, gl.UNSIGNED_BYTE, null)
57
58 gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);
59 gl.framebufferTexture2D(gl.FRAMEBUFFER,
60 gl.COLOR_ATTACHMENT0,
61 gl.TEXTURE_2D,
62 texture,
63 0);
64 }
65
66 // Create a shader that samples a 2D image.
67 var vertexShader = gl.createShader(gl.VERTEX_SHADER);
68 gl.shaderSource(vertexShader,
69 document.getElementById("vertex-shader").textContent);
70 gl.compileShader(vertexShader);
71
72 var fragmentShader = gl.createShader(gl.FRAGMENT_SHADER);
73 gl.shaderSource(fragmentShader,
74 document.getElementById("fragment-shader").textContent);
75 gl.compileShader(fragmentShader);
76
77 shaderProgram = gl.createProgram();
78 gl.attachShader(shaderProgram, vertexShader);
79 gl.attachShader(shaderProgram, fragmentShader);
80 gl.linkProgram(shaderProgram);
81 gl.useProgram(shaderProgram);
82
83 // Bind a vertex buffer with a single triangle
84 var buffer = gl.createBuffer();
85 gl.bindBuffer(gl.ARRAY_BUFFER, buffer);
86 var bufferData = new Float32Array([-1.0, -1.0, 1.0, -1.0, -1.0, 1.0]);
87 gl.bufferData(gl.ARRAY_BUFFER, bufferData, gl.STATIC_DRAW);
88 gl.enableVertexAttribArray(shaderProgram.a_position);
89 gl.vertexAttribPointer(shaderProgram.a_position, 2, gl.FLOAT, false, 0, 0);
90
91 // Signal back to the test runner that we're done allocating memory.
92 domAutomationController.send("DONE");
93
94 // Start the event loop.
95 tick();
96 }
97
98 function drawScene()
99 {
100 // Render a solid color to each texture.
101 for (var i = 0; i < n; ++i) {
102 gl.bindFramebuffer(gl.FRAMEBUFFER, fbos[i]);
103 gl.viewport(0, 0, 512, 512);
104 gl.clearColor(0.0, Math.sin(t/60.0)*0.25 + 0.75*(i+1.0)/n, 0.0, 1.0);
105 gl.clear(gl.COLOR_BUFFER_BIT);
106 }
107
108 // Draw these textures to the screen, offset by 1 pixel increments
109 gl.bindFramebuffer(gl.FRAMEBUFFER, null);
110 gl.viewport(0, 0, 256, 256);
111 gl.clearColor(0.0, 0.0, 0.0, 1.0);
112 gl.clear(gl.COLOR_BUFFER_BIT);
113 for (var i = 0; i < n; ++i) {
114 gl.viewport(i, i, 256-i, 256-i);
115 gl.activeTexture(gl.TEXTURE0);
116 gl.bindTexture(gl.TEXTURE_2D, textures[i]);
117 gl.uniform1i(shaderProgram.u_image, 0);
118 gl.drawArrays(gl.TRIANGLES, 0, 3);
119 }
120
121 t += 1;
122 }
123
124 function tick()
125 {
126 window.webkitRequestAnimationFrame(tick);
127 drawScene();
128 }
129 </script>
130 </head>
131
132 <body>
133 <div class="test-div" style="width=100px; height=100px;">
nduca 2013/01/05 05:14:42 is the outer test-div important here?
ccameron 2013/01/07 21:36:34 Nope, annihilated.
134 <canvas id="canvas_id" width=256px height=256px style="width:256px; height:2 56px;"/>
135 </div>
136 </body>
137 </html>
138
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