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<!--
Copyright (c) 2011 The Chromium Authors. All rights reserved.
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>WebGL OES_texture_float Conformance Tests</title>
<link rel="stylesheet" href="../../resources/js-test-style.css"/>
<script src="../../resources/desktop-gl-constants.js" type="text/javascript"></script>
<script src="../../resources/js-test-pre.js"></script>
<script src="../resources/webgl-test.js"></script>
<script src="../resources/webgl-test-utils.js"></script>
</head>
<body>
<div id="description"></div>
<canvas id="canvas" style="width: 50px; height: 50px;"> </canvas>
<div id="console"></div>
<!-- Shaders for testing floating-point textures -->
<script id="testFragmentShader" type="x-shader/x-fragment">
precision mediump float;
uniform sampler2D tex;
varying vec2 texCoord;
void main()
{
vec4 color = texture2D(tex, texCoord);
if (abs(color.r - 10000.0) +
abs(color.g - 10000.0) +
abs(color.b - 10000.0) +
abs(color.a - 10000.0) < 8.0) {
gl_FragColor = vec4(0.0, 1.0, 0.0, 1.0);
} else {
gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
}
}
</script>
<!-- Shaders for testing floating-point render targets -->
<script id="positionVertexShader" type="x-shader/x-vertex">
attribute vec4 vPosition;
void main()
{
gl_Position = vPosition;
}
</script>
<script id="floatingPointFragmentShader" type="x-shader/x-fragment">
void main()
{
gl_FragColor = vec4(10000.0, 10000.0, 10000.0, 10000.0);
}
</script>
<script>
description("This test verifies the functionality of the OES_texture_float extension, if it is available.");
debug("");
var wtu = WebGLTestUtils;
var canvas = document.getElementById("canvas");
var gl = create3DContext(canvas);
if (!gl) {
testFailed("WebGL context does not exist");
} else {
testPassed("WebGL context exists");
var texturedShaders = [
wtu.setupSimpleTextureVertexShader(gl),
"testFragmentShader"
];
var testProgram =
wtu.setupProgram(gl,
texturedShaders,
['vPosition', 'texCoord0'],
[0, 1]);
var quadParameters = wtu.setupUnitQuad(gl, 0, 1);
// First verify that allocation of floating-point textures fails if
// the extension has not been enabled yet.
runTextureCreationTest(testProgram, false);
if (!gl.getExtension("OES_texture_float")) {
testPassed("No OES_texture_float support -- this is legal");
} else {
testPassed("Successfully enabled OES_texture_float extension");
runTextureCreationTest(testProgram, true);
runRenderTargetTest(testProgram);
runUniqueObjectTest();
runReferenceCycleTest();
}
}
// Needs to be global for shouldBe to see it.
var pixels;
function allocateTexture()
{
var texture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, texture);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
glErrorShouldBe(gl, gl.NO_ERROR, "texture parameter setup should succeed");
return texture;
}
function checkRenderingResults()
{
pixels = new Uint8Array(4);
gl.readPixels(0, 0, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, pixels);
// Outputs green if OK, red if not.
shouldBe("pixels[0]", "0");
shouldBe("pixels[1]", "255");
shouldBe("pixels[2]", "0");
shouldBe("pixels[3]", "255");
}
function runTextureCreationTest(testProgram, extensionEnabled)
{
var expectFailure = !extensionEnabled;
var texture = allocateTexture();
// Generate data.
var width = 2;
var height = 2;
var numberOfChannels = 4;
var data = new Float32Array(width * height * numberOfChannels);
for (var ii = 0; ii < data.length; ++ii) {
data[ii] = 10000;
}
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, width, height, 0, gl.RGBA, gl.FLOAT, data);
if (expectFailure) {
wtu.glErrorShouldBeIn(gl, [gl.INVALID_ENUM, gl.INVALID_OPERATION],
"floating-point texture allocation must be disallowed if OES_texture_float isn't enabled");
return;
} else {
glErrorShouldBe(gl, gl.NO_ERROR, "floating-point texture allocation should succeed if OES_texture_float is enabled");
}
// Verify that the texture actually works for sampling and contains the expected data.
gl.uniform1i(gl.getUniformLocation(testProgram, "tex"), 0);
wtu.drawQuad(gl);
checkRenderingResults();
}
function runRenderTargetTest(testProgram)
{
var texture = allocateTexture();
var width = 2;
var height = 2;
var numberOfChannels = 4;
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, width, height, 0, gl.RGBA, gl.FLOAT, null);
glErrorShouldBe(gl, gl.NO_ERROR, "floating-point texture allocation should succeed if OES_texture_float is enabled");
// Use this texture as a render target.
var fbo = gl.createFramebuffer();
gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, texture, 0);
gl.bindTexture(gl.TEXTURE_2D, null);
// Enabling OES_texture_float will either implicitly enable the entirety of
// WEBGL_color_buffer_float, or it will not enable any of it. If it is not
// enabled, we'll get an FB_INCOMPLETE_ATTACHMENT here.
if (gl.checkFramebufferStatus(gl.FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE) {
shouldBe("gl.checkFramebufferStatus(gl.FRAMEBUFFER)", "gl.FRAMEBUFFER_INCOMPLETE_ATTACHMENT");
return;
}
shouldBe("gl.checkFramebufferStatus(gl.FRAMEBUFFER)", "gl.FRAMEBUFFER_COMPLETE");
var renderProgram =
wtu.setupProgram(gl,
["positionVertexShader", "floatingPointFragmentShader"],
['vPosition'],
[0]);
wtu.drawQuad(gl);
glErrorShouldBe(gl, gl.NO_ERROR, "rendering to floating-point texture should succeed");
// Now sample from the floating-point texture and verify we got the correct values.
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
gl.bindTexture(gl.TEXTURE_2D, texture);
gl.useProgram(testProgram);
gl.uniform1i(gl.getUniformLocation(testProgram, "tex"), 0);
wtu.drawQuad(gl);
glErrorShouldBe(gl, gl.NO_ERROR, "rendering from floating-point texture should succeed");
checkRenderingResults();
}
function runUniqueObjectTest()
{
debug("Testing that getExtension() returns the same object each time");
gl.getExtension("OES_texture_float").myProperty = 2;
gc();
shouldBe('gl.getExtension("OES_texture_float").myProperty', '2');
}
function runReferenceCycleTest()
{
// create some reference cycles. The goal is to see if they cause leaks. The point is that
// some browser test runners have instrumentation to detect leaked refcounted objects.
debug("Testing reference cycles between context and extension objects");
var ext = gl.getExtension("OES_texture_float");
// create cycle between extension and context, since the context has to hold a reference to the extension
ext.context = gl;
// create a self-cycle on the extension object
ext.ext = ext;
}
debug("");
successfullyParsed = true;
</script>
<script>finishTest();</script>
</body>
</html>
|
