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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>WebGL EXT_frag_depth 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 fragment depth writing -->
<!-- Shader omitting the required #extension pragma -->
<script id="missingPragmaFragmentShader" type="x-shader/x-fragment">
precision mediump float;
void main() {
gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
gl_FragDepthEXT = 1.0;
}
</script>
<!-- Shader to test macro definition -->
<script id="macroFragmentShader" type="x-shader/x-fragment">
precision mediump float;
void main() {
#ifdef GL_EXT_frag_depth
gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
#else
// Error expected
#error no GL_EXT_frag_depth;
#endif
}
</script>
<!-- Shader with required #extension pragma -->
<script id="testFragmentShader" type="x-shader/x-fragment">
#extension GL_EXT_frag_depth : enable
precision mediump float;
void main() {
gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
gl_FragDepthEXT = 1.0;
}
</script>
<!-- Shaders to link with test fragment shaders -->
<script id="goodVertexShader" type="x-shader/x-vertex">
attribute vec4 vPosition;
void main() {
gl_Position = vPosition;
}
</script>
<!-- Shaders to test output -->
<script id="outputVertexShader" type="x-shader/x-vertex">
attribute vec4 vPosition;
void main() {
gl_Position = vPosition;
}
</script>
<script id="outputFragmentShader" type="x-shader/x-fragment">
#extension GL_EXT_frag_depth : enable
precision mediump float;
uniform float uDepth;
void main() {
gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
gl_FragDepthEXT = uDepth;
}
</script>
<script>
"use strict";
description("This test verifies the functionality of the EXT_frag_depth extension, if it is available.");
debug("");
var wtu = WebGLTestUtils;
var canvas = document.getElementById("canvas");
var gl = wtu.create3DContext(canvas);
var ext = null;
if (!gl) {
testFailed("WebGL context does not exist");
} else {
testPassed("WebGL context exists");
runShaderTests(false);
// Query the extension and store globally so shouldBe can access it
ext = wtu.getExtensionWithKnownPrefixes(gl, "EXT_frag_depth");
if (!ext) {
testPassed("No EXT_frag_depth support -- this is legal");
runSupportedTest(false);
} else {
testPassed("Successfully enabled EXT_frag_depth extension");
runSupportedTest(true);
runShaderTests(true);
runOutputTests();
runUniqueObjectTest();
}
}
function runSupportedTest(extensionEnabled) {
var supported = gl.getSupportedExtensions();
if (supported.indexOf("EXT_frag_depth") >= 0) {
if (extensionEnabled) {
testPassed("EXT_frag_depth listed as supported and getExtension succeeded");
} else {
testFailed("EXT_frag_depth listed as supported but getExtension failed");
}
} else {
if (extensionEnabled) {
testFailed("EXT_frag_depth not listed as supported but getExtension succeeded");
} else {
testPassed("EXT_frag_depth not listed as supported and getExtension failed -- this is legal");
}
}
}
function runShaderTests(extensionEnabled) {
debug("");
debug("Testing various shader compiles with extension " + (extensionEnabled ? "enabled" : "disabled"));
// Expect the macro shader to succeed ONLY if enabled
var macroFragmentProgram = wtu.loadProgramFromScriptExpectError(gl, "goodVertexShader", "macroFragmentShader");
if (extensionEnabled) {
if (macroFragmentProgram) {
// Expected result
testPassed("GL_EXT_frag_depth defined in shaders when extension is enabled");
} else {
testFailed("GL_EXT_frag_depth not defined in shaders when extension is enabled");
}
} else {
if (macroFragmentProgram) {
testFailed("GL_EXT_frag_depth defined in shaders when extension is disabled");
} else {
testPassed("GL_EXT_frag_depth not defined in shaders when extension disabled");
}
}
// Always expect the shader missing the #pragma to fail (whether enabled or not)
var missingPragmaFragmentProgram = wtu.loadProgramFromScriptExpectError(gl, "goodVertexShader", "missingPragmaFragmentShader");
if (missingPragmaFragmentProgram) {
testFailed("Shader built-ins allowed without #extension pragma");
} else {
testPassed("Shader built-ins disallowed without #extension pragma");
}
// Try to compile a shader using the built-ins that should only succeed if enabled
var testFragmentProgram = wtu.loadProgramFromScriptExpectError(gl, "goodVertexShader", "testFragmentShader");
if (extensionEnabled) {
if (testFragmentProgram) {
testPassed("Shader built-ins compiled successfully when extension enabled");
} else {
testFailed("Shader built-ins failed to compile when extension enabled");
}
} else {
if (testFragmentProgram) {
testFailed("Shader built-ins compiled successfully when extension disabled");
} else {
testPassed("Shader built-ins failed to compile when extension disabled");
}
}
}
function runOutputTests() {
var e = 2; // Amount of variance to allow in result pixels - may need to be tweaked higher
debug("Testing various draws for valid built-in function behavior");
canvas.width = 50; canvas.height = 50;
gl.viewport(0, 0, canvas.width, canvas.height);
// Enable depth testing with a clearDepth of 0.5
// This makes it so that fragments are only rendered when
// gl_fragDepthEXT is < 0.5
gl.clearDepth(0.5);
gl.enable(gl.DEPTH_TEST);
var positionLoc = 0;
var texcoordLoc = 1;
var program = wtu.setupProgram(gl, ["outputVertexShader", "outputFragmentShader"], ['vPosition'], [0]);
var quadParameters = wtu.setupUnitQuad(gl, 0, 1);
var depthUniform = gl.getUniformLocation(program, "uDepth");
// Draw 1: Greater than clear depth
gl.uniform1f(depthUniform, 1.0);
wtu.clearAndDrawUnitQuad(gl);
wtu.checkCanvasRect(gl, 0, 0, canvas.width, canvas.height, [255, 255, 255, 255]);
// Draw 2: Less than clear depth
gl.uniform1f(depthUniform, 0.0);
wtu.clearAndDrawUnitQuad(gl);
wtu.checkCanvasRect(gl, 0, 0, canvas.width, canvas.height, [255, 0, 0, 255]);
}
function runUniqueObjectTest()
{
debug("Testing that getExtension() returns the same object each time");
gl.getExtension("EXT_frag_depth").myProperty = 2;
gc();
shouldBe('gl.getExtension("EXT_frag_depth").myProperty', '2');
}
debug("");
var successfullyParsed = true;
</script>
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</body>
</html>