| <!-- |
| Copyright (c) 2019 The Khronos Group Inc. |
| Use of this source code is governed by an MIT-style license that can be |
| found in the LICENSE.txt file. |
| --> |
| |
| <!DOCTYPE html> |
| <html> |
| <head> |
| <meta charset="utf-8"> |
| <title>WebGL Frag Depth Conformance Tests</title> |
| <link rel="stylesheet" href="../../resources/js-test-style.css"/> |
| <script src="../../js/js-test-pre.js"></script> |
| <script src="../../js/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 #version --> |
| <script id="fragmentShaderESSL1" type="x-shader/x-fragment"> |
| precision mediump float; |
| void main() { |
| gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0); |
| gl_FragDepth = 1.0; |
| } |
| </script> |
| <!-- Shader with required #version --> |
| <script id="fragmentShaderESSL3" type="x-shader/x-fragment">#version 300 es |
| precision mediump float; |
| out vec4 my_FragColor; |
| void main() { |
| my_FragColor = vec4(1.0, 0.0, 0.0, 1.0); |
| gl_FragDepth = 1.0; |
| } |
| </script> |
| <!-- Shader using the EXT suffix --> |
| <script id="fragmentShaderESSL3EXT" type="x-shader/x-fragment">#version 300 es |
| precision mediump float; |
| out vec4 my_FragColor; |
| void main() { |
| my_FragColor = vec4(1.0, 0.0, 0.0, 1.0); |
| gl_FragDepthEXT = 1.0; |
| } |
| </script> |
| <!-- Shaders to link with test fragment shaders --> |
| <script id="vertexShaderESSL1" type="x-shader/x-vertex"> |
| attribute vec4 vPosition; |
| void main() { |
| gl_Position = vPosition; |
| } |
| </script> |
| <script id="vertexShaderESSL3" type="x-shader/x-vertex">#version 300 es |
| in vec4 vPosition; |
| void main() { |
| gl_Position = vPosition; |
| } |
| </script> |
| |
| <!-- Shader to test output --> |
| <script id="outputFragmentShader" type="x-shader/x-fragment">#version 300 es |
| precision mediump float; |
| uniform float uDepth; |
| |
| out vec4 my_FragColor; |
| void main() { |
| my_FragColor = vec4(1.0, 0.0, 0.0, 1.0); |
| gl_FragDepth = uDepth; |
| } |
| </script> |
| |
| <script> |
| "use strict"; |
| description("This test verifies the functionality of setting fragment depth in a shader."); |
| |
| debug(""); |
| |
| var wtu = WebGLTestUtils; |
| var canvas = document.getElementById("canvas"); |
| var gl = wtu.create3DContext(canvas, null, 2); |
| |
| if (!gl) { |
| testFailed("WebGL context does not exist"); |
| } else { |
| testPassed("WebGL context exists"); |
| |
| runShaderTests(); |
| debug(""); |
| runOutputTests(); |
| } |
| |
| function runShaderTests() { |
| debug(""); |
| debug("Testing various shader compiles"); |
| |
| // Always expect ESSL1 shaders to fail |
| var fragmentProgramESSL1 = wtu.loadProgramFromScriptExpectError(gl, "vertexShaderESSL1", "fragmentShaderESSL1"); |
| if (fragmentProgramESSL1) { |
| testFailed("gl_FragDepth allowed in ESSL1 shader - should be disallowed"); |
| } else { |
| testPassed("gl_FragDepth disallowed in ESSL1 shader"); |
| } |
| |
| // Try to compile a shader using the built-ins that should only succeed if enabled |
| var testFragmentProgram = wtu.loadProgramFromScriptExpectError(gl, "vertexShaderESSL3", "fragmentShaderESSL3"); |
| if (testFragmentProgram) { |
| testPassed("gl_FragDepth allowed in ESSL3 shader"); |
| } else { |
| testFailed("gl_FragDepth disallowed in ESSL3 shader"); |
| } |
| |
| var testFragmentProgram = wtu.loadProgramFromScriptExpectError(gl, "vertexShaderESSL3", "fragmentShaderESSL3EXT"); |
| if (testFragmentProgram) { |
| testFailed("gl_FragDepthEXT allowed in ESSL3 shader - should only allow gl_FragDepth"); |
| } else { |
| testPassed("gl_FragDepthEXT disallowed in ESSL3 shader"); |
| } |
| } |
| |
| function runOutputTests() { |
| debug("Testing rendering results from writing to gl_FragData"); |
| |
| 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_FragDepth is < 0.5 |
| gl.clearDepth(0.5); |
| gl.enable(gl.DEPTH_TEST); |
| |
| var positionLoc = 0; |
| var texcoordLoc = 1; |
| var program = wtu.setupProgram(gl, ["vertexShaderESSL3", "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.checkCanvas(gl, [255, 255, 255, 255]); |
| |
| // Draw 2: Less than clear depth |
| gl.uniform1f(depthUniform, 0.0); |
| wtu.clearAndDrawUnitQuad(gl); |
| wtu.checkCanvas(gl, [255, 0, 0, 255]); |
| } |
| |
| debug(""); |
| var successfullyParsed = true; |
| </script> |
| <script src="../../js/js-test-post.js"></script> |
| |
| </body> |
| </html> |
