LayoutTests/fast/canvas/webgl/program-test.html - WebKit - Git at Google

 <!DOCTYPE html>
 <html>
 <head>
 <meta charset="utf-8">
 <title>WebGL Program Compiling/Linking Conformance Test</title>
 <script src="../../../resources/js-test.js" type="text/javascript"></script>
 <script src="resources/webgl-test.js" type="text/javascript"></script>
 </head>
 <body>
 <div id="description"></div>
 <div id="console"></div>
 <canvas id="canvas" width="2" height="2"> </canvas>
 <script type="text/javascript">
 function go() {
     description("Tests that program compiling/linking/using works correctly.");

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

     if (window.internals)
         window.internals.settings.setWebGLErrorsToConsoleEnabled(false);

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

     testPassed("context exists");

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

     function doArraysHaveSameContents(a, b) {
         var flags = [];
         function hasUnusedValue(a, value) {
             for (var ii = 0; ii < a.length; ++ii) {
                 if (a[ii] === value && !flags[ii]) {
                     flags[ii] = true;
                     return true;
                 }
             }
             return false;
         }

         try {
             if (a.length !== b.length) {
                 return false;
             }
             for (var ii = 0; ii < a.length; ii++) {
                 if (!hasUnusedValue(b, a[ii])) {
                     return false;
                 }
             }
         } catch (ex) {
             return false;
         }
         return true;
     }

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

     var vs = gl.createShader(gl.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, gl.COMPILE_STATUS) == true,
               "good vertex shader should compile");

     var vs2 = gl.createShader(gl.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, gl.COMPILE_STATUS) == true,
               "good vertex shader #2 should compile");

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

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

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

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

     var fs2 = gl.createShader(gl.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, gl.COMPILE_STATUS) == true,
               "good fragment shader #2 should compile");

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

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

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

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

     function 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() != gl.NO_ERROR)
             assertMsg(false, "unexpected error in attachShader()");
         gl.attachShader(prog, shader);
         glErrorShouldBe(gl, expected_error_code, errmsg);
     }

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

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

     function 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() != gl.NO_ERROR)
             assertMsg(false, "unexpected error in attachShader()");
         gl.detachShader(prog, shader);
         glErrorShouldBe(gl, expected_error_code, errmsg);
     }

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

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

     function 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() != gl.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() != gl.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 /////////////////////////////

     function 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() != gl.NO_ERROR)
             assertMsg(false, "unexpected error in linkProgram()");
         assertMsg(gl.getProgramParameter(prog, gl.LINK_STATUS) == expected_status, errmsg);
         if (expected_status == true && gl.getProgramParameter(prog, gl.LINK_STATUS) == false)
             debug(gl.getProgramInfoLog(prog));
         if (gl.getError() != gl.NO_ERROR)
             assertMsg(false, "unexpected error in getProgramParameter()");
         gl.useProgram(prog);
         if (expected_status == true)
             glErrorShouldBe(gl, gl.NO_ERROR, "using a valid program should succeed");
         if (expected_status == false)
             glErrorShouldBe(gl, gl.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, gl.NO_ERROR, "using a valid program shouldn't generate a GL error");

     var vbuf = gl.createBuffer();
     gl.bindBuffer(gl.ARRAY_BUFFER, vbuf);
     gl.bufferData(gl.ARRAY_BUFFER,
                   new Float32Array([
                       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]),
                   gl.STATIC_DRAW);
     gl.vertexAttribPointer(0, 4, gl.FLOAT, false, 0, 0);
     gl.enableVertexAttribArray(0);
     gl.vertexAttrib3f(1, 1.0, 0.0, 0.0);

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

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

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

     gl.useProgram(progGood2);
     gl.drawArrays(gl.TRIANGLES, 0, 3);
     glErrorShouldBe(gl, gl.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, gl.LINK_STATUS) == false,
               "linking should fail with in-use formerly good program, with new bad shader attached");

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

     var progGood1 = checkLinkAndUse([vs, fs], true, true, "delete shaders after attaching them and before linking program should not affect linkProgram");
     gl.useProgram(progGood1);
     gl.drawArrays(gl.TRIANGLES, 0, 4);
     glErrorShouldBe(gl, gl.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(gl.TRIANGLES, 0, 4);
     glErrorShouldBe(gl, gl.NO_ERROR, "delete the current program shouldn't change the current rendering state");

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

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

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

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

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

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

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

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

 debug("");
 go();
 </script>
 </body>
 </html>
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<title>WebGL Program Compiling/Linking Conformance Test</title>
	<script src="../../../resources/js-test.js" type="text/javascript"></script>
	<script src="resources/webgl-test.js" type="text/javascript"></script>
	</head>
	<body>
	<div id="description"></div>
	<div id="console"></div>
	<canvas id="canvas" width="2" height="2"> </canvas>
	<script type="text/javascript">
	function go() {
	description("Tests that program compiling/linking/using works correctly.");

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

	if (window.internals)
	window.internals.settings.setWebGLErrorsToConsoleEnabled(false);

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

	testPassed("context exists");

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

	function doArraysHaveSameContents(a, b) {
	var flags = [];
	function hasUnusedValue(a, value) {
	for (var ii = 0; ii < a.length; ++ii) {
	if (a[ii] === value && !flags[ii]) {
	flags[ii] = true;
	return true;
	}
	}
	return false;
	}

	try {
	if (a.length !== b.length) {
	return false;
	}
	for (var ii = 0; ii < a.length; ii++) {
	if (!hasUnusedValue(b, a[ii])) {
	return false;
	}
	}
	} catch (ex) {
	return false;
	}
	return true;
	}

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

	var vs = gl.createShader(gl.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, gl.COMPILE_STATUS) == true,
	"good vertex shader should compile");

	var vs2 = gl.createShader(gl.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, gl.COMPILE_STATUS) == true,
	"good vertex shader #2 should compile");

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

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

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

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

	var fs2 = gl.createShader(gl.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, gl.COMPILE_STATUS) == true,
	"good fragment shader #2 should compile");

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

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

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

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

	function 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() != gl.NO_ERROR)
	assertMsg(false, "unexpected error in attachShader()");
	gl.attachShader(prog, shader);
	glErrorShouldBe(gl, expected_error_code, errmsg);
	}

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

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

	function 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() != gl.NO_ERROR)
	assertMsg(false, "unexpected error in attachShader()");
	gl.detachShader(prog, shader);
	glErrorShouldBe(gl, expected_error_code, errmsg);
	}

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

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

	function 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() != gl.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() != gl.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 /////////////////////////////

	function 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() != gl.NO_ERROR)
	assertMsg(false, "unexpected error in linkProgram()");
	assertMsg(gl.getProgramParameter(prog, gl.LINK_STATUS) == expected_status, errmsg);
	if (expected_status == true && gl.getProgramParameter(prog, gl.LINK_STATUS) == false)
	debug(gl.getProgramInfoLog(prog));
	if (gl.getError() != gl.NO_ERROR)
	assertMsg(false, "unexpected error in getProgramParameter()");
	gl.useProgram(prog);
	if (expected_status == true)
	glErrorShouldBe(gl, gl.NO_ERROR, "using a valid program should succeed");
	if (expected_status == false)
	glErrorShouldBe(gl, gl.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, gl.NO_ERROR, "using a valid program shouldn't generate a GL error");

	var vbuf = gl.createBuffer();
	gl.bindBuffer(gl.ARRAY_BUFFER, vbuf);
	gl.bufferData(gl.ARRAY_BUFFER,
	new Float32Array([
	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]),
	gl.STATIC_DRAW);
	gl.vertexAttribPointer(0, 4, gl.FLOAT, false, 0, 0);
	gl.enableVertexAttribArray(0);
	gl.vertexAttrib3f(1, 1.0, 0.0, 0.0);

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

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

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

	gl.useProgram(progGood2);
	gl.drawArrays(gl.TRIANGLES, 0, 3);
	glErrorShouldBe(gl, gl.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, gl.LINK_STATUS) == false,
	"linking should fail with in-use formerly good program, with new bad shader attached");

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

	var progGood1 = checkLinkAndUse([vs, fs], true, true, "delete shaders after attaching them and before linking program should not affect linkProgram");
	gl.useProgram(progGood1);
	gl.drawArrays(gl.TRIANGLES, 0, 4);
	glErrorShouldBe(gl, gl.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(gl.TRIANGLES, 0, 4);
	glErrorShouldBe(gl, gl.NO_ERROR, "delete the current program shouldn't change the current rendering state");

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

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

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

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

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

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

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

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

	debug("");
	go();
	</script>
	</body>
	</html>