dom/canvas/test/webgl-conf/checkout/conformance2/transform_feedback/same-buffer-two-binding-points.html

   1 <!--
   2 Copyright (c) 2019 The Khronos Group Inc.
   3 Use of this source code is governed by an MIT-style license that can be
   4 found in the LICENSE.txt file.
   5 -->
   6
   7 <!DOCTYPE html>
   8 <html>
   9 <head>
  10 <meta charset="utf-8">
  11 <title>WebGL Transform Feedback Conformance Tests - one buffer bound to two binding points</title>
  12 <link rel="stylesheet" href="../../resources/js-test-style.css"/>
  13 <script src="../../js/js-test-pre.js"></script>
  14 <script src="../../js/webgl-test-utils.js"></script>
  15 </head>
  16 <body>
  17 <div id="description"></div>
  18 <div id="console"></div>
  19 <script id="vshader" type="x-shader/x-vertex">#version 300 es
  20
  21 in vec4 in_data;
  22 out vec4 out_add;
  23 out vec4 out_mul;
  24 void main(void) {
  25     out_add = in_data + vec4(2.0, 3.0, 4.0, 5.0);
  26     out_mul = in_data * vec4(2.0, 3.0, 4.0, 5.0);
  27 }
  28 </script>
  29 <script>
  30 "use strict";
  31 description();
  32
  33 debug("");
  34
  35 var wtu = WebGLTestUtils;
  36 var gl = wtu.create3DContext(null, null, 2);
  37 var program = null;
  38
  39 if (!gl) {
  40     testFailed("WebGL context does not exist");
  41 } else {
  42     testPassed("WebGL context exists");
  43     runTwoOutFeedbackTest();
  44 }
  45
  46 function doDrawWithTransformFeedback(expectedError, msg) {
  47     gl.beginTransformFeedback(gl.POINTS);
  48     wtu.glErrorShouldBe(gl, expectedError, msg);
  49     gl.drawArrays(gl.POINTS, 0, 3);
  50     gl.endTransformFeedback();
  51     gl.getError();
  52 }
  53
  54 function runTwoOutFeedbackTest() {
  55     debug("");
  56     debug("Test binding the same buffer to two transform feedback binding points. Buffer should be untouched and an error should be generated.")
  57
  58     // Build the input and output buffers
  59     var in_data = [
  60         1.0, 2.0, 3.0, 4.0,
  61         2.0, 4.0, 8.0, 16.0,
  62         0.75, 0.5, 0.25, 0.0
  63     ];
  64
  65     var in_buffer = gl.createBuffer();
  66     gl.bindBuffer(gl.ARRAY_BUFFER, in_buffer);
  67     gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(in_data), gl.STATIC_DRAW);
  68
  69     // Create the transform feedback shader
  70     program = wtu.setupTransformFeedbackProgram(gl, ["vshader", wtu.simpleColorFragmentShaderESSL300],
  71         ["out_add", "out_mul"], gl.SEPARATE_ATTRIBS,
  72         ["in_data"]);
  73     wtu.glErrorShouldBe(gl, gl.NO_ERROR, "linking transform feedback shader should not set an error");
  74     shouldBeNonNull("program");
  75
  76     // Draw the the transform feedback buffers
  77     var tf = gl.createTransformFeedback();
  78
  79     gl.enableVertexAttribArray(0);
  80     gl.bindBuffer(gl.ARRAY_BUFFER, in_buffer);
  81     gl.vertexAttribPointer(0, 4, gl.FLOAT, false, 16, 0);
  82
  83     var out_buffer = gl.createBuffer();
  84     var out_buffer2 = gl.createBuffer();
  85     gl.bindBuffer(gl.TRANSFORM_FEEDBACK_BUFFER, out_buffer);
  86
  87     // Test binding the same buffer to two transform feedback binding points with bindBufferBase.
  88     debug("");
  89     gl.enable(gl.RASTERIZER_DISCARD);
  90     gl.bufferData(gl.TRANSFORM_FEEDBACK_BUFFER, Float32Array.BYTES_PER_ELEMENT * in_data.length * 2, gl.STATIC_DRAW);
  91     gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, 0, out_buffer);
  92     gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, 1, out_buffer);
  93
  94     doDrawWithTransformFeedback(gl.INVALID_OPERATION, "same buffer bound to two transform feedback binding points with bindBufferBase");
  95
  96     gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, 0, null);
  97     gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, 1, null);
  98     gl.disable(gl.RASTERIZER_DISCARD);
  99
 100     // Check buffer contents.
 101     var expectedZeroes = [];
 102     for (var i = 0; i < in_data.length * 2; ++i)
 103     {
 104         expectedZeroes.push(0.0);
 105     }
 106     gl.bindBuffer(gl.TRANSFORM_FEEDBACK_BUFFER, out_buffer);
 107     debug("buffer should be untouched - filled with zeroes");
 108     wtu.checkFloatBuffer(gl, gl.TRANSFORM_FEEDBACK_BUFFER, expectedZeroes);
 109
 110     // Test binding the same buffer to two transform feedback binding points with bindBufferRange. The ranges overlap just slightly.
 111     debug("");
 112     gl.enable(gl.RASTERIZER_DISCARD);
 113     gl.bufferData(gl.TRANSFORM_FEEDBACK_BUFFER, Float32Array.BYTES_PER_ELEMENT * in_data.length * 2, gl.STATIC_DRAW);
 114     gl.bindBufferRange(gl.TRANSFORM_FEEDBACK_BUFFER, 0, out_buffer, 0, in_data.length * 4);
 115     gl.bindBufferRange(gl.TRANSFORM_FEEDBACK_BUFFER, 1, out_buffer, (in_data.length - 1) * 4, in_data.length * 4);
 116
 117     doDrawWithTransformFeedback(gl.INVALID_OPERATION, "same buffer bound to two transform feedback binding points with bindBufferRange, overlapping ranges");
 118
 119     gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, 0, null);
 120     gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, 1, null);
 121     gl.disable(gl.RASTERIZER_DISCARD);
 122
 123     // Check buffer contents.
 124     gl.bindBuffer(gl.TRANSFORM_FEEDBACK_BUFFER, out_buffer);
 125     debug("buffer should be untouched - filled with zeroes");
 126     wtu.checkFloatBuffer(gl, gl.TRANSFORM_FEEDBACK_BUFFER, expectedZeroes);
 127
 128     // Test non-overlapping ranges.
 129     debug("");
 130     gl.enable(gl.RASTERIZER_DISCARD);
 131     gl.bufferData(gl.TRANSFORM_FEEDBACK_BUFFER, Float32Array.BYTES_PER_ELEMENT * in_data.length * 2, gl.STATIC_DRAW);
 132     gl.bindBufferRange(gl.TRANSFORM_FEEDBACK_BUFFER, 0, out_buffer, 0, in_data.length * 4);
 133     gl.bindBufferRange(gl.TRANSFORM_FEEDBACK_BUFFER, 1, out_buffer, in_data.length * 4, in_data.length * 4);
 134
 135     doDrawWithTransformFeedback(gl.INVALID_OPERATION, "same buffer bound to two transform feedback binding points with bindBufferRange, non-overlapping ranges");
 136
 137     gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, 0, null);
 138     gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, 1, null);
 139     gl.disable(gl.RASTERIZER_DISCARD);
 140
 141     // Check buffer contents.
 142     gl.bindBuffer(gl.TRANSFORM_FEEDBACK_BUFFER, out_buffer);
 143     debug("buffer should be untouched - filled with zeroes");
 144     wtu.checkFloatBuffer(gl, gl.TRANSFORM_FEEDBACK_BUFFER, expectedZeroes);
 145
 146     // Test binding the same buffer to a binding point that doesn't have a corresponding output in the vertex shader.
 147     debug("");
 148     gl.enable(gl.RASTERIZER_DISCARD);
 149     gl.bindBuffer(gl.TRANSFORM_FEEDBACK_BUFFER, out_buffer2);
 150     gl.bufferData(gl.TRANSFORM_FEEDBACK_BUFFER, Float32Array.BYTES_PER_ELEMENT * in_data.length * 2, gl.STATIC_DRAW);
 151     gl.bindBuffer(gl.TRANSFORM_FEEDBACK_BUFFER, out_buffer);
 152     gl.bufferData(gl.TRANSFORM_FEEDBACK_BUFFER, Float32Array.BYTES_PER_ELEMENT * in_data.length * 2, gl.STATIC_DRAW);
 153     gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, 0, out_buffer);
 154     gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, 1, out_buffer2);
 155     gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, 2, out_buffer);  // No corresponding output.
 156
 157     doDrawWithTransformFeedback(gl.INVALID_OPERATION, "same buffer bound to two transform feedback binding points with bindBufferBase, but one of the binding points doesn't have a corresponding shader output");
 158
 159     gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, 0, null);
 160     gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, 1, null);
 161     gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, 2, null);
 162     gl.disable(gl.RASTERIZER_DISCARD);
 163
 164     // Check buffer contents.
 165     debug("buffers should be untouched - filled with zeroes");
 166     gl.bindBuffer(gl.TRANSFORM_FEEDBACK_BUFFER, out_buffer);
 167     wtu.checkFloatBuffer(gl, gl.TRANSFORM_FEEDBACK_BUFFER, expectedZeroes);
 168     gl.bindBuffer(gl.TRANSFORM_FEEDBACK_BUFFER, out_buffer2);
 169     wtu.checkFloatBuffer(gl, gl.TRANSFORM_FEEDBACK_BUFFER, expectedZeroes);
 170
 171     finishTest();
 172 }
 173 </script>
 174
 175 </body>
 176 </html>