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|
<!--
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 Transform Feedback 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>
<script id="vshader" type="x-shader/x-vertex">#version 300 es
in vec4 in_data;
out vec4 out_add;
out vec4 out_mul;
void main(void) {
out_add = in_data + vec4(2.0, 3.0, 4.0, 5.0);
out_mul = in_data * vec4(2.0, 3.0, 4.0, 5.0);
}
</script>
<script id="fshader" type="x-shader/x-fragment">#version 300 es
precision mediump float;
out vec4 out_color;
void main(void) {
out_color = vec4(1.0, 1.0, 1.0, 1.0);
}
</script>
<script>
"use strict";
description("This test verifies the functionality of the Transform Feedback objects.");
debug("");
var wtu = WebGLTestUtils;
var canvas = document.getElementById("canvas");
var gl = wtu.create3DContext(canvas, null, 2);
var tf = null;
var tf1 = null;
var buf = null;
let out_add_buffer = null;
var program = null;
var activeInfo = null;
var query = null;
var numberOfQueryCompletionAttempts = 0;
if (!gl) {
testFailed("WebGL context does not exist");
} else {
testPassed("WebGL context exists");
runBindingTest();
runTFBufferBindingTest();
runObjectTest();
runGetBufferSubDataTest();
runUnboundDeleteTest();
runBoundDeleteTest();
runOneOutputFeedbackTest();
runUnchangedBufferBindingsTest();
runNoOutputsTest();
// Must be the last test, since it's asynchronous and calls finishTest().
runTwoOutputFeedbackTest();
}
function runBindingTest() {
debug("");
debug("Testing binding enum");
shouldBe("gl.TRANSFORM_FEEDBACK_BINDING", "0x8E25");
gl.getParameter(gl.TRANSFORM_FEEDBACK_BINDING);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "TRANSFORM_FEEDBACK_BINDING query should succeed");
// Default value is null
shouldBe("gl.getParameter(gl.TRANSFORM_FEEDBACK_BINDING)", "null");
debug("Testing binding a Transform Feedback object");
tf = gl.createTransformFeedback();
tf1 = gl.createTransformFeedback();
shouldBeNull("gl.getParameter(gl.TRANSFORM_FEEDBACK_BINDING)");
gl.bindTransformFeedback(gl.TRANSFORM_FEEDBACK, tf);
shouldBe("gl.getParameter(gl.TRANSFORM_FEEDBACK_BINDING)", "tf");
gl.bindTransformFeedback(gl.TRANSFORM_FEEDBACK, tf1);
shouldBe("gl.getParameter(gl.TRANSFORM_FEEDBACK_BINDING)", "tf1");
gl.deleteTransformFeedback(tf);
gl.deleteTransformFeedback(tf1);
shouldBeNull("gl.getParameter(gl.TRANSFORM_FEEDBACK_BINDING)");
gl.bindTransformFeedback(gl.TRANSFORM_FEEDBACK, tf1);
wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "binding a deleted Transform Feedback object");
gl.bindTransformFeedback(gl.TRANSFORM_FEEDBACK, null);
shouldBeNull("gl.getParameter(gl.TRANSFORM_FEEDBACK_BINDING)");
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no errors");
}
function runTFBufferBindingTest() {
debug("");
debug("Testing binding and unbinding transform feedback objects and buffers");
buf = gl.createBuffer();
gl.bindBuffer(gl.TRANSFORM_FEEDBACK_BUFFER, buf);
gl.bufferData(gl.TRANSFORM_FEEDBACK_BUFFER, 16, gl.STATIC_DRAW);
gl.bindBuffer(gl.TRANSFORM_FEEDBACK_BUFFER, null);
tf = gl.createTransformFeedback();
gl.bindTransformFeedback(gl.TRANSFORM_FEEDBACK, tf);
gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, 0, buf);
gl.bindTransformFeedback(gl.TRANSFORM_FEEDBACK, null);
// gl.TRANSFORM_FEEDBACK_BUFFER is part of Transform Feedback objects'
// state. See OpenGL ES 3.0.5 Section 6.24.
//
// Since the TRANSFORM_FEEDBACK was just unbound, there should be nothing
// bound.
shouldBeNull('gl.getIndexedParameter(gl.TRANSFORM_FEEDBACK_BUFFER_BINDING, 0)');
// Binding the buffer to the ARRAY_BUFFER binding point should succeed.
gl.bindBuffer(gl.ARRAY_BUFFER, buf);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "binding buffer to ARRAY_BUFFER");
gl.bindBuffer(gl.ARRAY_BUFFER, null);
gl.deleteBuffer(buf);
buf = null;
gl.deleteTransformFeedback(tf);
tf = null;
}
function runObjectTest() {
debug("");
debug("Testing object creation");
tf = gl.createTransformFeedback();
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "createTransformFeedback should not set an error");
shouldBeNonNull("tf");
// Expect false if never bound
shouldBeFalse("gl.isTransformFeedback(tf)");
gl.bindTransformFeedback(gl.TRANSFORM_FEEDBACK, tf);
shouldBeTrue("gl.isTransformFeedback(tf)");
gl.bindTransformFeedback(gl.TRANSFORM_FEEDBACK, null);
shouldBeTrue("gl.isTransformFeedback(tf)");
gl.deleteTransformFeedback(tf);
shouldBeFalse("gl.isTransformFeedback(tf)");
shouldBeFalse("gl.isTransformFeedback(null)");
tf = null;
}
function runOneOutputFeedbackTest() {
debug("");
debug("Testing one-output transform feedback");
// Build the input and output buffers
var in_data = [
1.0, 2.0, 3.0, 4.0,
2.0, 4.0, 8.0, 16.0,
0.75, 0.5, 0.25, 0.0
];
var in_buffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, in_buffer);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(in_data), gl.STATIC_DRAW);
out_add_buffer = gl.createBuffer();
gl.bindBuffer(gl.TRANSFORM_FEEDBACK_BUFFER, out_add_buffer);
gl.bufferData(gl.TRANSFORM_FEEDBACK_BUFFER, Float32Array.BYTES_PER_ELEMENT * in_data.length, gl.STATIC_DRAW);
// Create the transform feedback shader
program = wtu.setupTransformFeedbackProgram(gl, ["vshader", "fshader"],
["out_add"], gl.SEPARATE_ATTRIBS,
["in_data"]);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "linking transform feedback shader should not set an error");
shouldBeNonNull("program");
// Draw the the transform feedback buffers
tf = gl.createTransformFeedback();
gl.enableVertexAttribArray(0);
gl.bindBuffer(gl.ARRAY_BUFFER, in_buffer);
gl.vertexAttribPointer(0, 4, gl.FLOAT, false, 16, 0);
gl.bindTransformFeedback(gl.TRANSFORM_FEEDBACK, tf);
gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, 0, out_add_buffer);
gl.enable(gl.RASTERIZER_DISCARD);
gl.beginTransformFeedback(gl.POINTS);
debug("Testing switching program while transform feedback is active");
gl.pauseTransformFeedback();
var program2 = wtu.setupSimpleColorProgram(gl);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Switching program while transform feedback is active and paused should succeed");
gl.useProgram(program);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Switching program while transform feedback is active and paused should succeed");
gl.resumeTransformFeedback();
gl.useProgram(program2);
wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "Switching program while transform feedback is active should fail");
shouldBe("gl.getParameter(gl.CURRENT_PROGRAM)", "program");
debug("Testing deleting an active transform feedback object");
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors before testing deletion");
gl.deleteTransformFeedback(tf);
wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "Deleting the transform feedback while active should fail, and have no effect");
shouldBe("gl.isTransformFeedback(tf)", "true");
debug("Resuming testing of single-output transform feedback");
gl.drawArrays(gl.POINTS, 0, 3);
gl.endTransformFeedback();
gl.disable(gl.RASTERIZER_DISCARD);
gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, 0, null);
// Verify the output buffer contents
var add_expected = [
3.0, 5.0, 7.0, 9.0,
4.0, 7.0, 12.0, 21.0,
2.75, 3.5, 4.25, 5.0
];
gl.bindBuffer(gl.TRANSFORM_FEEDBACK_BUFFER, out_add_buffer);
wtu.checkFloatBuffer(gl, gl.TRANSFORM_FEEDBACK_BUFFER, add_expected);
gl.deleteBuffer(in_buffer);
gl.deleteBuffer(out_add_buffer);
gl.deleteProgram(program);
gl.deleteTransformFeedback(tf);
tf = null;
program = null;
}
function runTwoOutputFeedbackTest() {
debug("");
debug("Testing two-output transform feedback");
// Build the input and output buffers
var in_data = [
1.0, 2.0, 3.0, 4.0,
2.0, 4.0, 8.0, 16.0,
0.75, 0.5, 0.25, 0.0
];
var in_buffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, in_buffer);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(in_data), gl.STATIC_DRAW);
out_add_buffer = gl.createBuffer();
gl.bindBuffer(gl.TRANSFORM_FEEDBACK_BUFFER, out_add_buffer);
gl.bufferData(gl.TRANSFORM_FEEDBACK_BUFFER, Float32Array.BYTES_PER_ELEMENT * in_data.length, gl.STATIC_DRAW);
var out_mul_buffer = gl.createBuffer();
gl.bindBuffer(gl.TRANSFORM_FEEDBACK_BUFFER, out_mul_buffer);
gl.bufferData(gl.TRANSFORM_FEEDBACK_BUFFER, Float32Array.BYTES_PER_ELEMENT * in_data.length, gl.STATIC_DRAW);
// Create the transform feedback shader
program = wtu.setupTransformFeedbackProgram(gl, ["vshader", "fshader"],
["out_add", "out_mul"], gl.SEPARATE_ATTRIBS,
["in_data"]);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "linking transform feedback shader should not set an error");
shouldBeNonNull("program");
// Create a query object to check the number of primitives written
query = gl.createQuery();
// Draw the the transform feedback buffers
tf = gl.createTransformFeedback();
gl.enableVertexAttribArray(0);
gl.bindBuffer(gl.ARRAY_BUFFER, in_buffer);
gl.vertexAttribPointer(0, 4, gl.FLOAT, false, 16, 0);
gl.bindTransformFeedback(gl.TRANSFORM_FEEDBACK, tf);
gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, 0, out_add_buffer);
gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, 1, out_mul_buffer);
gl.enable(gl.RASTERIZER_DISCARD);
gl.beginTransformFeedback(gl.POINTS);
gl.beginQuery(gl.TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN, query);
gl.drawArrays(gl.POINTS, 0, 3);
gl.endQuery(gl.TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN);
gl.endTransformFeedback();
gl.disable(gl.RASTERIZER_DISCARD);
gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, 0, null);
gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, 1, null);
// Verify the output buffer contents
var add_expected = [
3.0, 5.0, 7.0, 9.0,
4.0, 7.0, 12.0, 21.0,
2.75, 3.5, 4.25, 5.0
];
gl.bindBuffer(gl.TRANSFORM_FEEDBACK_BUFFER, out_add_buffer);
wtu.checkFloatBuffer(gl, gl.TRANSFORM_FEEDBACK_BUFFER, add_expected);
var mul_expected = [
2.0, 6.0, 12.0, 20.0,
4.0, 12.0, 32.0, 80.0,
1.5, 1.5, 1.0, 0.0
];
gl.bindBuffer(gl.TRANSFORM_FEEDBACK_BUFFER, out_mul_buffer);
wtu.checkFloatBuffer(gl, gl.TRANSFORM_FEEDBACK_BUFFER, mul_expected);
gl.deleteBuffer(in_buffer);
gl.deleteBuffer(out_add_buffer);
gl.deleteBuffer(out_mul_buffer);
gl.deleteProgram(program);
gl.deleteTransformFeedback(tf);
tf = null;
program = null;
// Check the result of the query. It should not be available yet.
// This constant was chosen arbitrarily to take around 1 second on
// one WebGL implementation on one desktop operating system. (Busy-
// loops based on calling Date.now() have been found unreliable.)
var numEarlyTests = 50000;
while (--numEarlyTests > 0) {
gl.finish();
if (gl.getQueryParameter(query, gl.QUERY_RESULT_AVAILABLE)) {
testFailed("Query's result became available too early");
finishTest();
return;
}
}
testPassed("TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN query's result didn't become available too early");
// Complete the rest of the test asynchronously.
requestAnimationFrame(completeTransformFeedbackQueryTest);
}
function runUnboundDeleteTest() {
debug("");
debug("Testing deleting buffers attached to an unbound transform feedback object");
// Theoretically it would be possible to verify the result of performing
// transform feedback into a deleted buffer object. The buffer would have to
// be latched into a VAO as well as into the transform feedback object. In
// order to get the results out of the output buffer, it would be necessary
// to run transform feedback again, reading from the buffer bound to the
// VAO, and writing into a (non-deleted) buffer object latched into the
// transform feedback object. It's not possible to arrange things to be able
// to copyBufferSubData from the deleted buffer object into a temporary one
// for readback.
// This would be a lot of code to test an unlikely corner case, so instead,
// this test verifies simpler behaviors.
out_add_buffer = gl.createBuffer();
const output_buffer_length = Float32Array.BYTES_PER_ELEMENT * 16;
gl.bindBuffer(gl.TRANSFORM_FEEDBACK_BUFFER, out_add_buffer);
gl.bufferData(gl.TRANSFORM_FEEDBACK_BUFFER, output_buffer_length, gl.STATIC_DRAW);
// Set up the transform feedback object
tf = gl.createTransformFeedback();
gl.bindTransformFeedback(gl.TRANSFORM_FEEDBACK, tf);
gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, 0, out_add_buffer);
// Unbind transform feedback and delete out_add_buffer.
gl.bindTransformFeedback(gl.TRANSFORM_FEEDBACK, null);
gl.deleteBuffer(out_add_buffer);
debug("isBuffer should report false after deletion");
shouldBe("gl.isBuffer(out_add_buffer)", "false");
gl.bindTransformFeedback(gl.TRANSFORM_FEEDBACK, tf);
debug("Transform feedback object should keep output buffer alive");
shouldBe("gl.getIndexedParameter(gl.TRANSFORM_FEEDBACK_BUFFER_BINDING, 0)", "out_add_buffer");
// Deleting the buffer again while the transform feedback is bound shouldn't unbind it.
gl.deleteBuffer(out_add_buffer);
debug("Deleting output buffer again should be a no-op");
shouldBe("gl.getIndexedParameter(gl.TRANSFORM_FEEDBACK_BUFFER_BINDING, 0)", "out_add_buffer");
// Try unbinding and rebinding the transform feedback object just
// to make sure that has no effect on the attached output buffer.
gl.bindTransformFeedback(gl.TRANSFORM_FEEDBACK, null);
gl.bindTransformFeedback(gl.TRANSFORM_FEEDBACK, tf);
debug("Transform feedback object should still keep output buffer alive");
shouldBe("gl.getIndexedParameter(gl.TRANSFORM_FEEDBACK_BUFFER_BINDING, 0)", "out_add_buffer");
gl.deleteTransformFeedback(tf);
tf = null;
out_add_buffer = null;
}
function runBoundDeleteTest() {
debug("");
debug("Testing deleting buffers attached to a bound transform feedback object");
out_add_buffer = gl.createBuffer();
const output_buffer_length = Float32Array.BYTES_PER_ELEMENT * 16;
gl.bindBuffer(gl.TRANSFORM_FEEDBACK_BUFFER, out_add_buffer);
gl.bufferData(gl.TRANSFORM_FEEDBACK_BUFFER, output_buffer_length, gl.STATIC_DRAW);
// Set up the transform feedback object
tf = gl.createTransformFeedback();
gl.bindTransformFeedback(gl.TRANSFORM_FEEDBACK, tf);
gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, 0, out_add_buffer);
// Delete the output buffer
gl.deleteBuffer(out_add_buffer);
gl.bindTransformFeedback(gl.TRANSFORM_FEEDBACK, tf);
debug("Buffer should have been unbound from active transform feedback");
shouldBeNull("gl.getIndexedParameter(gl.TRANSFORM_FEEDBACK_BUFFER_BINDING, 0)");
gl.deleteTransformFeedback(tf);
tf = null;
out_add_buffer = null;
}
var retArray;
function verifyGetBufferSubData(expected) {
wtu.shouldGenerateGLError(gl, expected, "gl.getBufferSubData(gl.TRANSFORM_FEEDBACK_BUFFER, 0, retArray, 0, retArray.length)");
}
function runGetBufferSubDataTest() {
debug("");
debug("Test that getBufferSubData...");
// Build the input and output buffers
var in_data = [
1.0, 2.0, 3.0, 4.0,
2.0, 4.0, 8.0, 16.0,
0.75, 0.5, 0.25, 0.0
];
retArray = new Float32Array(in_data.length);
var in_buffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, in_buffer);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(in_data), gl.STATIC_DRAW);
out_add_buffer = gl.createBuffer();
gl.bindBuffer(gl.TRANSFORM_FEEDBACK_BUFFER, out_add_buffer);
gl.bufferData(gl.TRANSFORM_FEEDBACK_BUFFER, Float32Array.BYTES_PER_ELEMENT * in_data.length, gl.STATIC_DRAW);
// Create the transform feedback shader
program = wtu.setupTransformFeedbackProgram(gl, ["vshader", "fshader"],
["out_add"], gl.SEPARATE_ATTRIBS,
["in_data"]);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "linking transform feedback shader should not set an error");
shouldBeNonNull("program");
// Draw the the transform feedback buffers
tf = gl.createTransformFeedback();
gl.enableVertexAttribArray(0);
gl.bindBuffer(gl.ARRAY_BUFFER, in_buffer);
gl.vertexAttribPointer(0, 4, gl.FLOAT, false, 16, 0);
gl.bindTransformFeedback(gl.TRANSFORM_FEEDBACK, null);
debug("... passes when a transform feedback object is not bound");
verifyGetBufferSubData(gl.NO_ERROR);
gl.bindTransformFeedback(gl.TRANSFORM_FEEDBACK, tf);
gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, 0, out_add_buffer);
debug("... passes when a transform feedback object is bound but not active");
verifyGetBufferSubData(gl.NO_ERROR);
gl.enable(gl.RASTERIZER_DISCARD);
gl.beginTransformFeedback(gl.POINTS);
debug("... fails when a transform feedback object is active");
verifyGetBufferSubData(gl.INVALID_OPERATION);
gl.drawArrays(gl.POINTS, 0, 3);
gl.endTransformFeedback();
gl.disable(gl.RASTERIZER_DISCARD);
gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, 0, null);
// Verify the output buffer contents
var add_expected = [
3.0, 5.0, 7.0, 9.0,
4.0, 7.0, 12.0, 21.0,
2.75, 3.5, 4.25, 5.0
];
gl.bindBuffer(gl.TRANSFORM_FEEDBACK_BUFFER, out_add_buffer);
wtu.checkFloatBuffer(gl, gl.TRANSFORM_FEEDBACK_BUFFER, add_expected);
tf = null;
program = null;
}
function completeTransformFeedbackQueryTest() {
debug("");
debug("Testing TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN query");
++numberOfQueryCompletionAttempts;
if (numberOfQueryCompletionAttempts > 500) {
testFailed("Query didn't become available in a reasonable time");
finishTest();
return;
}
if (!gl.getQueryParameter(query, gl.QUERY_RESULT_AVAILABLE)) {
requestAnimationFrame(completeTransformFeedbackQueryTest);
return;
}
var result = gl.getQueryParameter(query, gl.QUERY_RESULT);
if (result == 3) {
testPassed("TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN query returned a correct result (3)");
} else {
testFailed("TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN query returned an incorrect result " + result + " (expected 3)");
}
runVaryingsTest();
}
function verifyTransformFeedbackVarying(prog, index, valid, name) {
activeInfo = gl.getTransformFeedbackVarying(prog, index);
if (valid) {
wtu.glErrorShouldBe(gl, gl.NO_ERROR,
"Should be no errors from valid getTransformFeedbackVarying.");
shouldBeNonNull("activeInfo");
shouldBe("activeInfo.name", "'" + name + "'");
shouldBe("activeInfo.type", "gl.FLOAT_VEC4");
shouldBe("activeInfo.size", "1");
} else {
wtu.glErrorShouldBe(gl, gl.INVALID_VALUE,
"Should be INVALID_VALUE when calling getTransformFeedbackVarying with an invalid index.");
shouldBeNull("activeInfo");
}
}
function runVaryingsTest() {
debug("");
debug("Testing transform feedback varyings");
// Create the transform feedback shader. This is explicitly run after runTwoOutputFeedbackTest,
// as re-linking the shader here will test browser caching.
program = wtu.setupTransformFeedbackProgram(gl, ["vshader", "fshader"],
["out_add", "out_mul"], gl.SEPARATE_ATTRIBS,
["in_data"]);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "linking transform feedback shader should not set an error");
shouldBeNonNull("program");
// Check the varyings
shouldBe("gl.getProgramParameter(program, gl.TRANSFORM_FEEDBACK_VARYINGS)", "2");
verifyTransformFeedbackVarying(program, 0, true, "out_add");
verifyTransformFeedbackVarying(program, 1, true, "out_mul");
verifyTransformFeedbackVarying(program, 2, false);
// transformFeedbackVaryings() doesn't take effect until a successful link.
gl.transformFeedbackVaryings(program, ["out_mul"], gl.SEPARATE_ATTRIBS);
shouldBe("gl.getProgramParameter(program, gl.TRANSFORM_FEEDBACK_VARYINGS)", "2");
verifyTransformFeedbackVarying(program, 0, true, "out_add");
verifyTransformFeedbackVarying(program, 1, true, "out_mul");
verifyTransformFeedbackVarying(program, 2, false);
// Now relink.
gl.linkProgram(program);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "linking transform feedback shader should not set an error");
shouldBeTrue("gl.getProgramParameter(program, gl.LINK_STATUS)");
shouldBe("gl.getProgramParameter(program, gl.TRANSFORM_FEEDBACK_VARYINGS)", "1");
verifyTransformFeedbackVarying(program, 0, true, "out_mul");
verifyTransformFeedbackVarying(program, 1, false);
verifyTransformFeedbackVarying(program, 2, false);
// Test recompiling/relinking the program
// Regression test for http://crbug.com/716018
var skipCompileStatus = true;
program = wtu.setupTransformFeedbackProgram(gl, ["vshader", "fshader"],
["out_add", "out_mul"], gl.SEPARATE_ATTRIBS,
["in_data"], undefined, undefined, skipCompileStatus);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "linking transform feedback shader should not set an error");
shouldBeTrue("gl.getProgramParameter(program, gl.LINK_STATUS)");
shouldBe("gl.getProgramParameter(program, gl.TRANSFORM_FEEDBACK_VARYINGS)", "2");
verifyTransformFeedbackVarying(program, 0, true, "out_add");
verifyTransformFeedbackVarying(program, 1, true, "out_mul");
verifyTransformFeedbackVarying(program, 2, false);
runContextLostOneOutputFeedbackTest();
}
function runContextLostOneOutputFeedbackTest() {
var ext = gl.getExtension("WEBGL_lose_context");
if (!ext) {
debug("No WEBGL_lose_context support");
finishTest();
return;
}
debug("");
debug("Testing switching program after context lost while transform feedback is active");
var in_buffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, in_buffer);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(12), gl.STATIC_DRAW);
out_add_buffer = gl.createBuffer();
gl.bindBuffer(gl.TRANSFORM_FEEDBACK_BUFFER, out_add_buffer);
gl.bufferData(gl.TRANSFORM_FEEDBACK_BUFFER, Float32Array.BYTES_PER_ELEMENT * 12, gl.STATIC_DRAW);
// Create an extra program to try switching to
var program2 = wtu.setupSimpleColorProgram(gl);
// Create the transform feedback shader
program = wtu.setupTransformFeedbackProgram(gl, ["vshader", "fshader"],
["out_add"], gl.SEPARATE_ATTRIBS,
["in_data"]);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "linking transform feedback shader should not set an error");
shouldBeNonNull("program");
// Draw the the transform feedback buffers
tf = gl.createTransformFeedback();
gl.enableVertexAttribArray(0);
gl.bindBuffer(gl.ARRAY_BUFFER, in_buffer);
gl.vertexAttribPointer(0, 4, gl.FLOAT, false, 16, 0);
gl.bindTransformFeedback(gl.TRANSFORM_FEEDBACK, tf);
gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, 0, out_add_buffer);
gl.beginTransformFeedback(gl.POINTS);
debug("Calling loseContext()");
ext.loseContext();
shouldBeTrue("gl.isContextLost()");
shouldBe("gl.getError()", "gl.CONTEXT_LOST_WEBGL");
shouldBe("gl.getError()", "gl.NO_ERROR");
debug("Trying to switch program");
gl.useProgram(program2);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "No transform feedback error generated on lost context");
finishTest();
}
function runUnchangedBufferBindingsTest() {
debug("");
debug("Testing that buffer bindings cannot be changed while transform feedback is active");
program = wtu.setupTransformFeedbackProgram(
gl, [wtu.simpleVertexShader, wtu.simpleColorFragmentShader], ['gl_Position'], gl.INTERLEAVED_ATTRIBS);
tf = gl.createTransformFeedback();
gl.bindTransformFeedback(gl.TRANSFORM_FEEDBACK, tf);
buf = gl.createBuffer();
gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, 0, buf);
gl.beginTransformFeedback(gl.POINTS);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Transform feedback is active");
gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, 0, gl.createBuffer());
wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "Cannot change the bound buffer while transform feedback is active");
shouldBe("gl.getIndexedParameter(gl.TRANSFORM_FEEDBACK_BUFFER_BINDING, 0)", "buf");
gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, 0, buf);
wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "Cannot rebind the same buffer while transform feedback is active");
gl.bindBufferRange(gl.TRANSFORM_FEEDBACK_BUFFER, 0, gl.createBuffer(), 0, 64);
wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "Cannot change the bound buffer while transform feedback is active");
shouldBe("gl.getIndexedParameter(gl.TRANSFORM_FEEDBACK_BUFFER_BINDING, 0)", "buf");
gl.bindBufferRange(gl.TRANSFORM_FEEDBACK_BUFFER, 0, buf, 0, 64);
wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "Cannot rebind the same buffer while transform feedback is active");
gl.endTransformFeedback();
gl.deleteTransformFeedback(tf);
gl.deleteBuffer(buf);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "No extra errors after the test");
}
function runNoOutputsTest() {
debug("");
debug("Testing transform feedback with no varyings to record");
tf = gl.createTransformFeedback();
gl.bindTransformFeedback(gl.TRANSFORM_FEEDBACK, tf);
buf = gl.createBuffer();
gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, 0, buf);
for (const mode of ['SEPARATE_ATTRIBS', 'INTERLEAVED_ATTRIBS']) {
program = wtu.setupTransformFeedbackProgram(
gl, [wtu.simpleVertexShader, wtu.simpleColorFragmentShader], [], gl[mode]);
debug(`Testing with ${mode}`);
gl.beginTransformFeedback(gl.POINTS);
wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "beginTransformFeedback: No varyings to record");
gl.useProgram(null);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "useProgram: Transform feedback is not active");
gl.endTransformFeedback();
wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "endTransformFeedback: Transform feedback is not active");
}
gl.deleteTransformFeedback(tf);
gl.deleteBuffer(buf);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "No extra errors after the test");
}
debug("");
</script>
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