LayoutTests/fast/canvas/webgl/program-test_t01.dart - co19 - Git at Google

 /*
  * Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
 /**
  * @description Tests that program compiling/linking/using works correctly.
  */
 import "dart:html";
 import "dart:web_gl" as wgl;
 import 'dart:typed_data';
 import "../../../testcommon.dart";
 import "resources/webgl-test.dart";
 import "resources/webgl-test-utils.dart" as wtu;
 import "resources/desktop-gl-constants.dart";
 import "../../../../Utils/async_utils.dart";

 main() {
   document.body.setInnerHtml('''
       <div id="console"></div>
       <canvas id="canvas" width="2" height="2"> </canvas>
       <div>PASS</div>
       ''', treeSanitizer: new NullTreeSanitizer());

   go() {
     debug("");
     debug("Canvas.getContext");

     var gl = create3DContext(document.getElementById("canvas"));
     if (gl == null) {
       testFailed("context does not exist");
       return;
     }

     testPassed("context exists");

     gl.clearColor(0.0, 0.0, 0.0, 0.0);
     gl.clear(wgl.COLOR_BUFFER_BIT | wgl.DEPTH_BUFFER_BIT);

     doArraysHaveSameContents(a, b) {
       var aset = new Set.from(a);
       var bset = new Set.from(b);
       return aset.difference(bset).isEmpty && bset.difference(aset).isEmpty;
     }

     /////// Check compileShader() /////////////////////////////

     var vs = gl.createShader(wgl.VERTEX_SHADER);
     gl.shaderSource(vs, "attribute vec4 aVertex; attribute vec4 aColor; varying vec4 vColor; void main() { vColor = aColor; gl_Position = aVertex; }");
     gl.compileShader(vs);

     assertMsg(gl.getShaderParameter(vs, wgl.COMPILE_STATUS) == true,
         "good vertex shader should compile");

     var vs2 = gl.createShader(wgl.VERTEX_SHADER);
     gl.shaderSource(vs2, "attribute vec4 aVertex; attribute vec4 aColor; varying vec4 vColor; void main() { vColor = aColor; gl_Position = aVertex * 0.5; }");
     gl.compileShader(vs2);

     assertMsg(gl.getShaderParameter(vs2, wgl.COMPILE_STATUS) == true,
         "good vertex shader #2 should compile");

     var vsBad = gl.createShader(wgl.VERTEX_SHADER);
     gl.shaderSource(vsBad, "WILL NOT COMPILE;");
     gl.compileShader(vsBad);

     assertMsg(gl.getShaderParameter(vsBad, wgl.COMPILE_STATUS) == false,
         "bad vertex shader should fail to compile");

     var fs = gl.createShader(wgl.FRAGMENT_SHADER);
     gl.shaderSource(fs, "precision mediump float; varying vec4 vColor; void main() { gl_FragColor = vColor; }");
     gl.compileShader(fs);

     assertMsg(gl.getShaderParameter(fs, wgl.COMPILE_STATUS) == true,
         "good fragment shader should compile");

     var fs2 = gl.createShader(wgl.FRAGMENT_SHADER);
     gl.shaderSource(fs2, "precision mediump float; varying vec4 vColor; void main() { gl_FragColor = vColor * 0.5; }");
     gl.compileShader(fs2);

     assertMsg(gl.getShaderParameter(fs2, wgl.COMPILE_STATUS) == true,
         "good fragment shader #2 should compile");

     var fsBad = gl.createShader(wgl.FRAGMENT_SHADER);
     gl.shaderSource(fsBad, "WILL NOT COMPILE;");
     gl.compileShader(fsBad);

     assertMsg(gl.getShaderParameter(fsBad, wgl.COMPILE_STATUS) == false,
         "bad fragment shader should fail to compile");

     glErrorShouldBe(gl, wgl.NO_ERROR, "should be no errors at this point");

     /////// Check attachShader() /////////////////////////////

     checkAttachShader(already_attached_shaders, shader, expected_error_code, errmsg) {
       var prog = gl.createProgram();
       for (var i = 0; i < already_attached_shaders.length; ++i)
         gl.attachShader(prog, already_attached_shaders[i]);
       if(gl.getError() != wgl.NO_ERROR)
         assertMsg(false, "unexpected error in attachShader()");
       gl.attachShader(prog, shader);
       glErrorShouldBe(gl, expected_error_code, errmsg);
     }

     checkAttachShader([], vs, wgl.NO_ERROR, "attaching a vertex shader should succeed");
     checkAttachShader([vs], vs, wgl.INVALID_OPERATION,
         "attaching an already attached vertex shader should generate INVALID_OPERATION");
     checkAttachShader([], fs, wgl.NO_ERROR, "attaching a fragment shader should succeed");
     checkAttachShader([fs], fs, wgl.INVALID_OPERATION,
         "attaching an already attached fragment shader should generate INVALID_OPERATION");
     checkAttachShader([vs], vs2, wgl.INVALID_OPERATION,
         "attaching shaders of the same type to a program should generate INVALID_OPERATION");
     checkAttachShader([fs], fs2, wgl.INVALID_OPERATION,
         "attaching shaders of the same type to a program should generate INVALID_OPERATION");

     /////// Check detachShader() /////////////////////////////

     checkDetachShader(already_attached_shaders, shader, expected_error_code, errmsg) {
       var prog = gl.createProgram();
       for (var i = 0; i < already_attached_shaders.length; ++i)
         gl.attachShader(prog, already_attached_shaders[i]);
       if(gl.getError() != wgl.NO_ERROR)
         assertMsg(false, "unexpected error in attachShader()");
       gl.detachShader(prog, shader);
       glErrorShouldBe(gl, expected_error_code, errmsg);
     }

     checkDetachShader([vs], vs, wgl.NO_ERROR, "detaching a vertex shader should succeed");
     checkDetachShader([fs], vs, wgl.INVALID_OPERATION,
         "detaching a not already attached vertex shader should generate INVALID_OPERATION");
     checkDetachShader([fs], fs, wgl.NO_ERROR, "detaching a fragment shader should succeed");
     checkDetachShader([vs], fs, wgl.INVALID_OPERATION,
         "detaching a not already attached fragment shader should generate INVALID_OPERATION");

     /////// Check getAttachedShaders() /////////////////////////////

     checkGetAttachedShaders(shaders_to_attach, shaders_to_detach, expected_shaders, errmsg) {
       var prog = gl.createProgram();
       for (var i = 0; i < shaders_to_attach.length; ++i)
         gl.attachShader(prog, shaders_to_attach[i]);
       if(gl.getError() != wgl.NO_ERROR)
         assertMsg(false, "unexpected error in attachShader()");
       for (var i = 0; i < shaders_to_detach.length; ++i)
         gl.detachShader(prog, shaders_to_detach[i]);
       if(gl.getError() != wgl.NO_ERROR)
         assertMsg(false, "unexpected error in detachShader()");
       assertMsg(doArraysHaveSameContents(gl.getAttachedShaders(prog), expected_shaders), errmsg);
     }
     checkGetAttachedShaders([], [], [], "getAttachedShaders should return an empty list by default");
     checkGetAttachedShaders([fs], [], [fs], "attaching a single shader should give the expected list");
     checkGetAttachedShaders([fs, vs], [], [fs, vs],
         "attaching some shaders should give the expected list");
     checkGetAttachedShaders([fs], [fs], [], "attaching a shader and detaching it shoud leave an empty list");
     checkGetAttachedShaders([fs, vs], [fs, vs], [],
         "attaching some shaders and detaching them in same order shoud leave an empty list");
     checkGetAttachedShaders([fs, vs], [vs, fs], [],
         "attaching some shaders and detaching them in random order shoud leave an empty list");
     checkGetAttachedShaders([fs, vs], [vs], [fs],
         "attaching and detaching some shaders should leave the difference list");
     checkGetAttachedShaders([fs, vs], [fs], [vs],
         "attaching and detaching some shaders should leave the difference list");
     checkGetAttachedShaders([fsBad], [], [fsBad],
         "attaching a shader that failed to compile should still show it in the list");
     checkGetAttachedShaders([fs, vsBad], [], [fs, vsBad],
         "attaching shaders, including one that failed to compile, should still show the it in the list");

     /////// Check linkProgram() and useProgram /////////////////////////////

     checkLinkAndUse(shaders, deleteShaderAfterAttach, expected_status, errmsg) {
       var prog = gl.createProgram();
       for (var i = 0; i < shaders.length; ++i) {
         gl.attachShader(prog, shaders[i]);
         if (deleteShaderAfterAttach)
           gl.deleteShader(shaders[i]);
       }
       gl.bindAttribLocation(prog, 0, "aVertex");
       gl.bindAttribLocation(prog, 1, "aColor");
       gl.linkProgram(prog);
       if (gl.getError() != wgl.NO_ERROR)
         assertMsg(false, "unexpected error in linkProgram()");
       assertMsg(gl.getProgramParameter(prog, wgl.LINK_STATUS) == expected_status, errmsg);
       if (expected_status == true && gl.getProgramParameter(prog, wgl.LINK_STATUS) == false)
         debug(gl.getProgramInfoLog(prog));
       if (gl.getError() != wgl.NO_ERROR)
         assertMsg(false, "unexpected error in getProgramParameter()");
       gl.useProgram(prog);
       if (expected_status == true)
         glErrorShouldBe(gl, wgl.NO_ERROR, "using a valid program should succeed");
       if (expected_status == false)
         glErrorShouldBe(gl, wgl.INVALID_OPERATION, "using an invalid program should generate INVALID_OPERATION");
       return prog;
     }

     var progGood1 = checkLinkAndUse([vs, fs], false, true, "valid program should link");
     var progGood2 = checkLinkAndUse([vs, fs2], false, true, "valid program #2 should link");
     var progBad1 = checkLinkAndUse([vs], false, false, "program with no fragment shader should fail to link");
     var progBad2 = checkLinkAndUse([fs], false, false, "program with no vertex shader should fail to link");
     var progBad3 = checkLinkAndUse([vsBad, fs], false, false, "program with bad vertex shader should fail to link");
     var progBad4 = checkLinkAndUse([vs, fsBad], false, false, "program with bad fragment shader should fail to link");
     var progBad5 = checkLinkAndUse([vsBad, fsBad], false, false, "program with bad shaders should fail to link");

     gl.useProgram(progGood1);
     glErrorShouldBe(gl, wgl.NO_ERROR, "using a valid program shouldn't generate a GL error");

     var vbuf = gl.createBuffer();
     gl.bindBuffer(wgl.ARRAY_BUFFER, vbuf);
     gl.bufferData(wgl.ARRAY_BUFFER,
         new Float32List.fromList([
           0.0, 0.0, 0.0, 1.0,
           1.0, 0.0, 0.0, 1.0,
           1.0, 1.0, 0.0, 1.0,
           0.0, 1.0, 0.0, 1.0]),
         wgl.STATIC_DRAW);
     gl.vertexAttribPointer(0, 4, wgl.FLOAT, false, 0, 0);
     gl.enableVertexAttribArray(0);
     gl.vertexAttrib3f(1, 1.0, 0.0, 0.0);

     glErrorShouldBe(gl, wgl.NO_ERROR, "should be no errors at this point #2");

     gl.useProgram(progGood1);
     gl.drawArrays(wgl.TRIANGLES, 0, 3);
     glErrorShouldBe(gl, wgl.NO_ERROR, "drawing with a valid program shouldn't generate a GL error");

     gl.useProgram(progBad1);
     glErrorShouldBe(gl, wgl.INVALID_OPERATION, "using an invalid program should generate INVALID_OPERATION");
     gl.drawArrays(wgl.TRIANGLES, 0, 3);
     glErrorShouldBe(gl, wgl.NO_ERROR, "Try to use an invalid program should not change the current rendering state");

     gl.useProgram(progGood2);
     gl.drawArrays(wgl.TRIANGLES, 0, 3);
     glErrorShouldBe(gl, wgl.NO_ERROR, "drawing with a valid program shouldn't generate a GL error");
     gl.detachShader(progGood2, fs2);
     gl.attachShader(progGood2, fsBad);
     gl.linkProgram(progGood2);
     assertMsg(gl.getProgramParameter(progGood2, wgl.LINK_STATUS) == false,
         "linking should fail with in-use formerly good program, with new bad shader attached");

     gl.useProgram(progGood1);
     gl.drawArrays(wgl.TRIANGLES, 0, 4);
     glErrorShouldBe(gl, wgl.NO_ERROR, "drawing with a valid when last used program shouldn't generate a GL error");

     progGood1 = checkLinkAndUse([vs, fs], true, true, "delete shaders after attaching them and before linking program should not affect linkProgram");
     gl.useProgram(progGood1);
     gl.drawArrays(wgl.TRIANGLES, 0, 4);
     glErrorShouldBe(gl, wgl.NO_ERROR, "drawing with a valid when last used program shouldn't generate a GL error");

     /////// Check deleteProgram() and deleteShader() /////////////////////////////

     gl.useProgram(progGood1);
     gl.deleteProgram(progGood1);
     gl.drawArrays(wgl.TRIANGLES, 0, 4);
     glErrorShouldBe(gl, wgl.NO_ERROR, "delete the current program shouldn't change the current rendering state");

     gl.linkProgram(progGood1);
     glErrorShouldBe(gl, wgl.NO_ERROR, "The current program shouldn't be deleted");

     var fs3 = gl.createShader(wgl.FRAGMENT_SHADER);
     gl.shaderSource(fs3, "precision mediump float; varying vec4 vColor; void main() { gl_FragColor = vColor; }");
     gl.compileShader(fs3);

     assertMsg(gl.getShaderParameter(fs3, wgl.COMPILE_STATUS) == true,
         "good fragment shader should compile");

     gl.deleteShader(fs3);
     gl.compileShader(fs3);
     glErrorShouldBe(gl, wgl.INVALID_VALUE, "an unattached shader should be deleted immediately");

     fs3 = gl.createShader(wgl.FRAGMENT_SHADER);
     gl.shaderSource(fs3, "precision mediump float; varying vec4 vColor; void main() { gl_FragColor = vColor; }");
     gl.compileShader(fs3);

     assertMsg(gl.getShaderParameter(fs3, wgl.COMPILE_STATUS) == true,
         "good fragment shader should compile");

     gl.detachShader(progGood1, fs);
     gl.attachShader(progGood1, fs3);

     gl.deleteShader(fs3);
     gl.compileShader(fs3);
     assertMsg(gl.getShaderParameter(fs3, wgl.COMPILE_STATUS) == true,
         "an attached shader shouldn't be deleted");

     gl.useProgram(null);
     gl.linkProgram(progGood1);
     glErrorShouldBe(gl, wgl.INVALID_VALUE, "a delete-marked program should be deleted once it's no longer the current program");

     gl.compileShader(fs3);
     glErrorShouldBe(gl, wgl.INVALID_VALUE, "a delete-marked shader should be deleted once all its attachments are removed");
   }

   debug("");
   go();
 }
	/*
	* Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file
	* for details. All rights reserved. Use of this source code is governed by a
	* BSD-style license that can be found in the LICENSE file.
	*/
	/**
	* @description Tests that program compiling/linking/using works correctly.
	*/
	import "dart:html";
	import "dart:web_gl" as wgl;
	import 'dart:typed_data';
	import "../../../testcommon.dart";
	import "resources/webgl-test.dart";
	import "resources/webgl-test-utils.dart" as wtu;
	import "resources/desktop-gl-constants.dart";
	import "../../../../Utils/async_utils.dart";

	main() {
	document.body.setInnerHtml('''
	<div id="console"></div>
	<canvas id="canvas" width="2" height="2"> </canvas>
	<div>PASS</div>
	''', treeSanitizer: new NullTreeSanitizer());

	go() {
	debug("");
	debug("Canvas.getContext");

	var gl = create3DContext(document.getElementById("canvas"));
	if (gl == null) {
	testFailed("context does not exist");
	return;
	}

	testPassed("context exists");

	gl.clearColor(0.0, 0.0, 0.0, 0.0);
	gl.clear(wgl.COLOR_BUFFER_BIT \| wgl.DEPTH_BUFFER_BIT);

	doArraysHaveSameContents(a, b) {
	var aset = new Set.from(a);
	var bset = new Set.from(b);
	return aset.difference(bset).isEmpty && bset.difference(aset).isEmpty;
	}

	/////// Check compileShader() /////////////////////////////

	var vs = gl.createShader(wgl.VERTEX_SHADER);
	gl.shaderSource(vs, "attribute vec4 aVertex; attribute vec4 aColor; varying vec4 vColor; void main() { vColor = aColor; gl_Position = aVertex; }");
	gl.compileShader(vs);

	assertMsg(gl.getShaderParameter(vs, wgl.COMPILE_STATUS) == true,
	"good vertex shader should compile");

	var vs2 = gl.createShader(wgl.VERTEX_SHADER);
	gl.shaderSource(vs2, "attribute vec4 aVertex; attribute vec4 aColor; varying vec4 vColor; void main() { vColor = aColor; gl_Position = aVertex * 0.5; }");
	gl.compileShader(vs2);

	assertMsg(gl.getShaderParameter(vs2, wgl.COMPILE_STATUS) == true,
	"good vertex shader #2 should compile");

	var vsBad = gl.createShader(wgl.VERTEX_SHADER);
	gl.shaderSource(vsBad, "WILL NOT COMPILE;");
	gl.compileShader(vsBad);

	assertMsg(gl.getShaderParameter(vsBad, wgl.COMPILE_STATUS) == false,
	"bad vertex shader should fail to compile");

	var fs = gl.createShader(wgl.FRAGMENT_SHADER);
	gl.shaderSource(fs, "precision mediump float; varying vec4 vColor; void main() { gl_FragColor = vColor; }");
	gl.compileShader(fs);

	assertMsg(gl.getShaderParameter(fs, wgl.COMPILE_STATUS) == true,
	"good fragment shader should compile");

	var fs2 = gl.createShader(wgl.FRAGMENT_SHADER);
	gl.shaderSource(fs2, "precision mediump float; varying vec4 vColor; void main() { gl_FragColor = vColor * 0.5; }");
	gl.compileShader(fs2);

	assertMsg(gl.getShaderParameter(fs2, wgl.COMPILE_STATUS) == true,
	"good fragment shader #2 should compile");

	var fsBad = gl.createShader(wgl.FRAGMENT_SHADER);
	gl.shaderSource(fsBad, "WILL NOT COMPILE;");
	gl.compileShader(fsBad);

	assertMsg(gl.getShaderParameter(fsBad, wgl.COMPILE_STATUS) == false,
	"bad fragment shader should fail to compile");

	glErrorShouldBe(gl, wgl.NO_ERROR, "should be no errors at this point");

	/////// Check attachShader() /////////////////////////////

	checkAttachShader(already_attached_shaders, shader, expected_error_code, errmsg) {
	var prog = gl.createProgram();
	for (var i = 0; i < already_attached_shaders.length; ++i)
	gl.attachShader(prog, already_attached_shaders[i]);
	if(gl.getError() != wgl.NO_ERROR)
	assertMsg(false, "unexpected error in attachShader()");
	gl.attachShader(prog, shader);
	glErrorShouldBe(gl, expected_error_code, errmsg);
	}

	checkAttachShader([], vs, wgl.NO_ERROR, "attaching a vertex shader should succeed");
	checkAttachShader([vs], vs, wgl.INVALID_OPERATION,
	"attaching an already attached vertex shader should generate INVALID_OPERATION");
	checkAttachShader([], fs, wgl.NO_ERROR, "attaching a fragment shader should succeed");
	checkAttachShader([fs], fs, wgl.INVALID_OPERATION,
	"attaching an already attached fragment shader should generate INVALID_OPERATION");
	checkAttachShader([vs], vs2, wgl.INVALID_OPERATION,
	"attaching shaders of the same type to a program should generate INVALID_OPERATION");
	checkAttachShader([fs], fs2, wgl.INVALID_OPERATION,
	"attaching shaders of the same type to a program should generate INVALID_OPERATION");

	/////// Check detachShader() /////////////////////////////

	checkDetachShader(already_attached_shaders, shader, expected_error_code, errmsg) {
	var prog = gl.createProgram();
	for (var i = 0; i < already_attached_shaders.length; ++i)
	gl.attachShader(prog, already_attached_shaders[i]);
	if(gl.getError() != wgl.NO_ERROR)
	assertMsg(false, "unexpected error in attachShader()");
	gl.detachShader(prog, shader);
	glErrorShouldBe(gl, expected_error_code, errmsg);
	}

	checkDetachShader([vs], vs, wgl.NO_ERROR, "detaching a vertex shader should succeed");
	checkDetachShader([fs], vs, wgl.INVALID_OPERATION,
	"detaching a not already attached vertex shader should generate INVALID_OPERATION");
	checkDetachShader([fs], fs, wgl.NO_ERROR, "detaching a fragment shader should succeed");
	checkDetachShader([vs], fs, wgl.INVALID_OPERATION,
	"detaching a not already attached fragment shader should generate INVALID_OPERATION");

	/////// Check getAttachedShaders() /////////////////////////////

	checkGetAttachedShaders(shaders_to_attach, shaders_to_detach, expected_shaders, errmsg) {
	var prog = gl.createProgram();
	for (var i = 0; i < shaders_to_attach.length; ++i)
	gl.attachShader(prog, shaders_to_attach[i]);
	if(gl.getError() != wgl.NO_ERROR)
	assertMsg(false, "unexpected error in attachShader()");
	for (var i = 0; i < shaders_to_detach.length; ++i)
	gl.detachShader(prog, shaders_to_detach[i]);
	if(gl.getError() != wgl.NO_ERROR)
	assertMsg(false, "unexpected error in detachShader()");
	assertMsg(doArraysHaveSameContents(gl.getAttachedShaders(prog), expected_shaders), errmsg);
	}
	checkGetAttachedShaders([], [], [], "getAttachedShaders should return an empty list by default");
	checkGetAttachedShaders([fs], [], [fs], "attaching a single shader should give the expected list");
	checkGetAttachedShaders([fs, vs], [], [fs, vs],
	"attaching some shaders should give the expected list");
	checkGetAttachedShaders([fs], [fs], [], "attaching a shader and detaching it shoud leave an empty list");
	checkGetAttachedShaders([fs, vs], [fs, vs], [],
	"attaching some shaders and detaching them in same order shoud leave an empty list");
	checkGetAttachedShaders([fs, vs], [vs, fs], [],
	"attaching some shaders and detaching them in random order shoud leave an empty list");
	checkGetAttachedShaders([fs, vs], [vs], [fs],
	"attaching and detaching some shaders should leave the difference list");
	checkGetAttachedShaders([fs, vs], [fs], [vs],
	"attaching and detaching some shaders should leave the difference list");
	checkGetAttachedShaders([fsBad], [], [fsBad],
	"attaching a shader that failed to compile should still show it in the list");
	checkGetAttachedShaders([fs, vsBad], [], [fs, vsBad],
	"attaching shaders, including one that failed to compile, should still show the it in the list");

	/////// Check linkProgram() and useProgram /////////////////////////////

	checkLinkAndUse(shaders, deleteShaderAfterAttach, expected_status, errmsg) {
	var prog = gl.createProgram();
	for (var i = 0; i < shaders.length; ++i) {
	gl.attachShader(prog, shaders[i]);
	if (deleteShaderAfterAttach)
	gl.deleteShader(shaders[i]);
	}
	gl.bindAttribLocation(prog, 0, "aVertex");
	gl.bindAttribLocation(prog, 1, "aColor");
	gl.linkProgram(prog);
	if (gl.getError() != wgl.NO_ERROR)
	assertMsg(false, "unexpected error in linkProgram()");
	assertMsg(gl.getProgramParameter(prog, wgl.LINK_STATUS) == expected_status, errmsg);
	if (expected_status == true && gl.getProgramParameter(prog, wgl.LINK_STATUS) == false)
	debug(gl.getProgramInfoLog(prog));
	if (gl.getError() != wgl.NO_ERROR)
	assertMsg(false, "unexpected error in getProgramParameter()");
	gl.useProgram(prog);
	if (expected_status == true)
	glErrorShouldBe(gl, wgl.NO_ERROR, "using a valid program should succeed");
	if (expected_status == false)
	glErrorShouldBe(gl, wgl.INVALID_OPERATION, "using an invalid program should generate INVALID_OPERATION");
	return prog;
	}

	var progGood1 = checkLinkAndUse([vs, fs], false, true, "valid program should link");
	var progGood2 = checkLinkAndUse([vs, fs2], false, true, "valid program #2 should link");
	var progBad1 = checkLinkAndUse([vs], false, false, "program with no fragment shader should fail to link");
	var progBad2 = checkLinkAndUse([fs], false, false, "program with no vertex shader should fail to link");
	var progBad3 = checkLinkAndUse([vsBad, fs], false, false, "program with bad vertex shader should fail to link");
	var progBad4 = checkLinkAndUse([vs, fsBad], false, false, "program with bad fragment shader should fail to link");
	var progBad5 = checkLinkAndUse([vsBad, fsBad], false, false, "program with bad shaders should fail to link");

	gl.useProgram(progGood1);
	glErrorShouldBe(gl, wgl.NO_ERROR, "using a valid program shouldn't generate a GL error");

	var vbuf = gl.createBuffer();
	gl.bindBuffer(wgl.ARRAY_BUFFER, vbuf);
	gl.bufferData(wgl.ARRAY_BUFFER,
	new Float32List.fromList([
	0.0, 0.0, 0.0, 1.0,
	1.0, 0.0, 0.0, 1.0,
	1.0, 1.0, 0.0, 1.0,
	0.0, 1.0, 0.0, 1.0]),
	wgl.STATIC_DRAW);
	gl.vertexAttribPointer(0, 4, wgl.FLOAT, false, 0, 0);
	gl.enableVertexAttribArray(0);
	gl.vertexAttrib3f(1, 1.0, 0.0, 0.0);

	glErrorShouldBe(gl, wgl.NO_ERROR, "should be no errors at this point #2");

	gl.useProgram(progGood1);
	gl.drawArrays(wgl.TRIANGLES, 0, 3);
	glErrorShouldBe(gl, wgl.NO_ERROR, "drawing with a valid program shouldn't generate a GL error");

	gl.useProgram(progBad1);
	glErrorShouldBe(gl, wgl.INVALID_OPERATION, "using an invalid program should generate INVALID_OPERATION");
	gl.drawArrays(wgl.TRIANGLES, 0, 3);
	glErrorShouldBe(gl, wgl.NO_ERROR, "Try to use an invalid program should not change the current rendering state");

	gl.useProgram(progGood2);
	gl.drawArrays(wgl.TRIANGLES, 0, 3);
	glErrorShouldBe(gl, wgl.NO_ERROR, "drawing with a valid program shouldn't generate a GL error");
	gl.detachShader(progGood2, fs2);
	gl.attachShader(progGood2, fsBad);
	gl.linkProgram(progGood2);
	assertMsg(gl.getProgramParameter(progGood2, wgl.LINK_STATUS) == false,
	"linking should fail with in-use formerly good program, with new bad shader attached");

	gl.useProgram(progGood1);
	gl.drawArrays(wgl.TRIANGLES, 0, 4);
	glErrorShouldBe(gl, wgl.NO_ERROR, "drawing with a valid when last used program shouldn't generate a GL error");

	progGood1 = checkLinkAndUse([vs, fs], true, true, "delete shaders after attaching them and before linking program should not affect linkProgram");
	gl.useProgram(progGood1);
	gl.drawArrays(wgl.TRIANGLES, 0, 4);
	glErrorShouldBe(gl, wgl.NO_ERROR, "drawing with a valid when last used program shouldn't generate a GL error");

	/////// Check deleteProgram() and deleteShader() /////////////////////////////

	gl.useProgram(progGood1);
	gl.deleteProgram(progGood1);
	gl.drawArrays(wgl.TRIANGLES, 0, 4);
	glErrorShouldBe(gl, wgl.NO_ERROR, "delete the current program shouldn't change the current rendering state");

	gl.linkProgram(progGood1);
	glErrorShouldBe(gl, wgl.NO_ERROR, "The current program shouldn't be deleted");

	var fs3 = gl.createShader(wgl.FRAGMENT_SHADER);
	gl.shaderSource(fs3, "precision mediump float; varying vec4 vColor; void main() { gl_FragColor = vColor; }");
	gl.compileShader(fs3);

	assertMsg(gl.getShaderParameter(fs3, wgl.COMPILE_STATUS) == true,
	"good fragment shader should compile");

	gl.deleteShader(fs3);
	gl.compileShader(fs3);
	glErrorShouldBe(gl, wgl.INVALID_VALUE, "an unattached shader should be deleted immediately");

	fs3 = gl.createShader(wgl.FRAGMENT_SHADER);
	gl.shaderSource(fs3, "precision mediump float; varying vec4 vColor; void main() { gl_FragColor = vColor; }");
	gl.compileShader(fs3);

	assertMsg(gl.getShaderParameter(fs3, wgl.COMPILE_STATUS) == true,
	"good fragment shader should compile");

	gl.detachShader(progGood1, fs);
	gl.attachShader(progGood1, fs3);

	gl.deleteShader(fs3);
	gl.compileShader(fs3);
	assertMsg(gl.getShaderParameter(fs3, wgl.COMPILE_STATUS) == true,
	"an attached shader shouldn't be deleted");

	gl.useProgram(null);
	gl.linkProgram(progGood1);
	glErrorShouldBe(gl, wgl.INVALID_VALUE, "a delete-marked program should be deleted once it's no longer the current program");

	gl.compileShader(fs3);
	glErrorShouldBe(gl, wgl.INVALID_VALUE, "a delete-marked shader should be deleted once all its attachments are removed");
	}

	debug("");
	go();
	}