| <!DOCTYPE html> |
| <html> |
| <head> |
| <meta charset="utf-8"> |
| <title>WebGL Transform Feedback Conformance Test - Default Transform Feedback</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> |
| <script id="vshader" type="x-shader/x-vertex">#version 300 es |
| in float in_value; |
| out float out_value; |
| |
| void main() { |
| out_value = in_value * 2.; |
| } |
| </script> |
| <script id="fshader" type="x-shader/x-fragment">#version 300 es |
| precision mediump float; |
| out vec4 dummy; |
| void main() { |
| dummy = vec4(1); |
| } |
| </script> |
| <script> |
| "use strict"; |
| description("This test verifies using the default transform feedback object"); |
| |
| 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"); |
| |
| runDefaultTransformFeedbackTest(); |
| finishTest(); |
| } |
| |
| function runDefaultTransformFeedbackTest() { |
| const prog = wtu.setupTransformFeedbackProgram(gl, ["vshader", "fshader"], |
| ["out_value"], gl.SEPARATE_ATTRIBS, |
| ["in_value"]); |
| wtu.glErrorShouldBe(gl, gl.NO_ERROR, "linking transform feedback shader should not set an error"); |
| |
| const inLoc = 0; |
| const outLoc = 0; |
| |
| const srcBuffer1 = createBuffer(gl, new Float32Array([1, 2, 3])); |
| const srcVAO1 = createVAO(gl, srcBuffer1, inLoc); |
| |
| const dstBuffer = createBuffer(gl, Float32Array.BYTES_PER_ELEMENT * 3); |
| |
| const tf = null; // use the default transform feedback gl.createTransformFeedback(); |
| gl.bindTransformFeedback(gl.TRANSFORM_FEEDBACK, tf); |
| gl.useProgram(prog); |
| gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, outLoc, dstBuffer); |
| wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no errors binding a buffer to the default transform feedback"); |
| |
| runFeedback(gl, prog, srcVAO1, tf); |
| wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no errors having drawn with the default transform feedback"); |
| |
| const expected = [2, 4, 6]; |
| gl.bindBuffer(gl.TRANSFORM_FEEDBACK_BUFFER, dstBuffer); |
| wtu.checkFloatBuffer(gl, gl.TRANSFORM_FEEDBACK_BUFFER, expected); |
| wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no errors after readback"); |
| } |
| |
| function runFeedback(gl, prog, srcVAO, tf, dstBufferInfo) { |
| gl.enable(gl.RASTERIZER_DISCARD); |
| |
| gl.useProgram(prog); |
| gl.bindVertexArray(srcVAO); |
| |
| gl.bindTransformFeedback(gl.TRANSFORM_FEEDBACK, tf); |
| gl.beginTransformFeedback(gl.TRIANGLES); |
| wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no errors setting up to draw with the default transform feedback"); |
| gl.drawArrays(gl.TRIANGLES, 0, 3); |
| gl.endTransformFeedback(); |
| |
| gl.disable(gl.RASTERIZER_DISCARD); |
| } |
| |
| function createBuffer(gl, dataOrSize) { |
| const buf = gl.createBuffer(); |
| gl.bindBuffer(gl.ARRAY_BUFFER, buf); |
| gl.bufferData(gl.ARRAY_BUFFER, dataOrSize, gl.STATIC_DRAW); |
| gl.bindBuffer(gl.ARRAY_BUFFER, null); // Clear this or we'll have tfo/non-tfo simultaneous usage. |
| return buf; |
| } |
| |
| function createVAO(gl, buf, inLoc) { |
| const vao = gl.createVertexArray(); |
| gl.bindVertexArray(vao); |
| gl.bindBuffer(gl.ARRAY_BUFFER, buf); |
| gl.enableVertexAttribArray(inLoc); |
| gl.vertexAttribPointer(inLoc, 1, gl.FLOAT, false, 0, 0); |
| gl.bindVertexArray(null); |
| return vao; |
| } |
| </script> |
| </body> |
| </html> |
| |
| <!-- |
| 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. |
| --> |
