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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 WEBGL_draw_buffers 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>
<script src="../../js/tests/webgl-draw-buffers-utils.js"></script>
</head>
<body>
<div id="description"></div>
<canvas id="canvas" width="64" height="64"> </canvas>
<div id="console"></div>
<script id="fshader" type="x-shader/x-fragment">
#extension GL_EXT_draw_buffers : require
precision mediump float;
uniform vec4 u_colors[$(numDrawingBuffers)];
void main() {
for (int i = 0; i < $(numDrawingBuffers); ++i) {
gl_FragData[i] = u_colors[i];
}
}
</script>
<script id="fshaderNoWrite" type="x-shader/x-fragment">
#extension GL_EXT_draw_buffers : require
void main() {
}
</script>
<script id="fshaderRed" type="x-shader/x-fragment">
precision mediump float;
void main() {
gl_FragColor = vec4(1,0,0,1);
}
</script>
<script id="fshaderRedWithExtension" type="x-shader/x-fragment">
#extension GL_EXT_draw_buffers : require
precision mediump float;
void main() {
gl_FragColor = vec4(1,0,0,1);
}
</script>
<script id="fshaderMacroDisabled" type="x-shader/x-fragment">
#ifdef GL_EXT_draw_buffers
bad code here
#endif
precision mediump float;
void main() {
gl_FragColor = vec4(0,0,0,0);
}
</script>
<script id="fshaderMacroEnabled" type="x-shader/x-fragment">
#ifdef GL_EXT_draw_buffers
#if GL_EXT_draw_buffers == 1
#define CODE
#else
#define CODE this_code_is_bad_it_should_have_compiled
#endif
#else
#define CODE this_code_is_bad_it_should_have_compiled
#endif
CODE
precision mediump float;
void main() {
gl_FragColor = vec4(0,0,0,0);
}
</script>
<script id="fshaderBuiltInConstEnabled" type="x-shader/x-fragment">
precision mediump float;
void main() {
gl_FragColor = (gl_MaxDrawBuffers == $(numDrawingBuffers)) ? vec4(0,1,0,1) : vec4(1,0,0,1);
}
</script>
<script>
"use strict";
description("This test verifies the functionality of the WEBGL_draw_buffers extension, if it is available.");
debug("");
var wtu = WebGLTestUtils;
var canvas = document.getElementById("canvas");
var gl = wtu.create3DContext(canvas);
var ext = null;
var programWithMaxDrawBuffersEqualOne = null;
var drawBuffersUtils;
let fb;
var extensionConstants = [
{ name: "MAX_COLOR_ATTACHMENTS_WEBGL", enum: 0x8CDF, expectedFn: function(v) { return v >= 4; }, passMsg: " should be >= 4"},
{ name: "MAX_DRAW_BUFFERS_WEBGL", enum: 0x8824, expectedFn: function(v) { return v > 0; }, passMsg: " should be > 0"},
{ name: "COLOR_ATTACHMENT0_WEBGL", enum: 0x8CE0, },
{ name: "COLOR_ATTACHMENT1_WEBGL", enum: 0x8CE1, },
{ name: "COLOR_ATTACHMENT2_WEBGL", enum: 0x8CE2, },
{ name: "COLOR_ATTACHMENT3_WEBGL", enum: 0x8CE3, },
{ name: "COLOR_ATTACHMENT4_WEBGL", enum: 0x8CE4, },
{ name: "COLOR_ATTACHMENT5_WEBGL", enum: 0x8CE5, },
{ name: "COLOR_ATTACHMENT6_WEBGL", enum: 0x8CE6, },
{ name: "COLOR_ATTACHMENT7_WEBGL", enum: 0x8CE7, },
{ name: "COLOR_ATTACHMENT8_WEBGL", enum: 0x8CE8, },
{ name: "COLOR_ATTACHMENT9_WEBGL", enum: 0x8CE9, },
{ name: "COLOR_ATTACHMENT10_WEBGL", enum: 0x8CEA, },
{ name: "COLOR_ATTACHMENT11_WEBGL", enum: 0x8CEB, },
{ name: "COLOR_ATTACHMENT12_WEBGL", enum: 0x8CEC, },
{ name: "COLOR_ATTACHMENT13_WEBGL", enum: 0x8CED, },
{ name: "COLOR_ATTACHMENT14_WEBGL", enum: 0x8CEE, },
{ name: "COLOR_ATTACHMENT15_WEBGL", enum: 0x8CEF, },
{ name: "DRAW_BUFFER0_WEBGL", enum: 0x8825, },
{ name: "DRAW_BUFFER1_WEBGL", enum: 0x8826, },
{ name: "DRAW_BUFFER2_WEBGL", enum: 0x8827, },
{ name: "DRAW_BUFFER3_WEBGL", enum: 0x8828, },
{ name: "DRAW_BUFFER4_WEBGL", enum: 0x8829, },
{ name: "DRAW_BUFFER5_WEBGL", enum: 0x882A, },
{ name: "DRAW_BUFFER6_WEBGL", enum: 0x882B, },
{ name: "DRAW_BUFFER7_WEBGL", enum: 0x882C, },
{ name: "DRAW_BUFFER8_WEBGL", enum: 0x882D, },
{ name: "DRAW_BUFFER9_WEBGL", enum: 0x882E, },
{ name: "DRAW_BUFFER10_WEBGL", enum: 0x882F, },
{ name: "DRAW_BUFFER11_WEBGL", enum: 0x8830, },
{ name: "DRAW_BUFFER12_WEBGL", enum: 0x8831, },
{ name: "DRAW_BUFFER13_WEBGL", enum: 0x8832, },
{ name: "DRAW_BUFFER14_WEBGL", enum: 0x8833, },
{ name: "DRAW_BUFFER15_WEBGL", enum: 0x8834, },
];
if (!gl) {
testFailed("WebGL context does not exist");
} else {
testPassed("WebGL context exists");
// Run tests with extension disabled
runEnumTestDisabled();
runShadersTestDisabled();
runAttachmentTestDisabled();
debug("");
// Query the extension and store globally so shouldBe can access it
ext = gl.getExtension("WEBGL_draw_buffers");
if (!ext) {
testPassed("No WEBGL_draw_buffers support -- this is legal");
runSupportedTest(false);
finishTest();
} else {
testPassed("Successfully enabled WEBGL_draw_buffers extension");
drawBuffersUtils = WebGLDrawBuffersUtils(gl, ext);
runSupportedTest(true);
runEnumTestEnabled();
runShadersTestEnabled();
runAttachmentTestEnabled();
runDrawTests();
runPreserveTests();
}
}
function createExtDrawBuffersProgram(scriptId, sub) {
var fsource = wtu.getScript(scriptId);
fsource = wtu.replaceParams(fsource, sub);
return wtu.setupProgram(gl, [wtu.simpleVertexShader, fsource], ["vPosition"], undefined, true);
}
function runSupportedTest(extensionEnabled) {
var supported = gl.getSupportedExtensions();
if (supported.indexOf("WEBGL_draw_buffers") >= 0) {
if (extensionEnabled) {
testPassed("WEBGL_draw_buffers listed as supported and getExtension succeeded");
} else {
testFailed("WEBGL_draw_buffers listed as supported but getExtension failed");
}
} else {
if (extensionEnabled) {
testFailed("WEBGL_draw_buffers not listed as supported but getExtension succeeded");
} else {
testPassed("WEBGL_draw_buffers not listed as supported and getExtension failed -- this is legal");
}
}
}
function runEnumTestDisabled() {
debug("");
debug("Testing binding enum with extension disabled");
// Use the constant directly as we don't have the extension
extensionConstants.forEach(function(c) {
if (c.expectedFn) {
gl.getParameter(c.enum);
wtu.glErrorShouldBe(gl, gl.INVALID_ENUM, c.name + " should not be queryable if extension is disabled");
}
});
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no errors");
}
function runEnumTestEnabled() {
debug("");
debug("Testing enums with extension enabled");
extensionConstants.forEach(function(c) {
shouldBe("ext." + c.name, "0x" + c.enum.toString(16));
if (c.expectedFn) {
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "before getParameter");
debug(c.name + ": 0x" + ext[c.name].toString(16));
expectTrue(c.expectedFn(gl.getParameter(ext[c.name])), "gl.getParameter(ext." + c.name + ")" + c.passMsg);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, c.name + " query should succeed if extension is enabled");
}
});
shouldBeTrue("gl.getParameter(ext.MAX_COLOR_ATTACHMENTS_WEBGL) >= gl.getParameter(ext.MAX_DRAW_BUFFERS_WEBGL)");
debug("Testing drawBuffersWEBGL with default drawing buffer");
shouldBe("gl.getParameter(ext.DRAW_BUFFER0_WEBGL)", "gl.BACK");
wtu.shouldGenerateGLError(gl, gl.INVALID_OPERATION, "ext.drawBuffersWEBGL([])");
wtu.shouldGenerateGLError(gl, gl.INVALID_OPERATION, "ext.drawBuffersWEBGL([gl.NONE, gl.NONE])");
wtu.shouldGenerateGLError(gl, gl.INVALID_OPERATION, "ext.drawBuffersWEBGL([ext.COLOR_ATTACHMENT0_WEBGL])");
shouldBe("gl.getParameter(ext.DRAW_BUFFER0_WEBGL)", "gl.BACK");
wtu.shouldGenerateGLError(gl, gl.NO_ERROR, "ext.drawBuffersWEBGL([gl.NONE])");
shouldBe("gl.getParameter(ext.DRAW_BUFFER0_WEBGL)", "gl.NONE");
wtu.shouldGenerateGLError(gl, gl.NO_ERROR, "ext.drawBuffersWEBGL([gl.BACK])");
shouldBe("gl.getParameter(ext.DRAW_BUFFER0_WEBGL)", "gl.BACK");
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no errors");
debug("Testing drawBuffers and getParameter with bindFramebuffer, without drawing.");
fb = gl.createFramebuffer();
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
shouldBe("gl.getParameter(ext.DRAW_BUFFER0_WEBGL)", "gl.COLOR_ATTACHMENT0");
shouldBe("gl.getParameter(ext.DRAW_BUFFER0_WEBGL+1)", "gl.NONE");
wtu.shouldGenerateGLError(gl, gl.NO_ERROR, "ext.drawBuffersWEBGL([gl.NONE])");
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
shouldBe("gl.getParameter(ext.DRAW_BUFFER0_WEBGL)", "gl.BACK");
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
shouldBe("gl.getParameter(ext.DRAW_BUFFER0_WEBGL)", "gl.NONE");
wtu.shouldGenerateGLError(gl, gl.NO_ERROR, "ext.drawBuffersWEBGL([gl.NONE,gl.COLOR_ATTACHMENT0+1])");
shouldBe("gl.getParameter(ext.DRAW_BUFFER0_WEBGL)", "gl.NONE");
shouldBe("gl.getParameter(ext.DRAW_BUFFER0_WEBGL+1)", "gl.COLOR_ATTACHMENT0+1");
wtu.shouldGenerateGLError(gl, gl.NO_ERROR, "ext.drawBuffersWEBGL([gl.COLOR_ATTACHMENT0,gl.COLOR_ATTACHMENT0+1])");
shouldBe("gl.getParameter(ext.DRAW_BUFFER0_WEBGL)", "gl.COLOR_ATTACHMENT0");
shouldBe("gl.getParameter(ext.DRAW_BUFFER0_WEBGL+1)", "gl.COLOR_ATTACHMENT0+1");
wtu.shouldGenerateGLError(gl, gl.NO_ERROR, "gl.deleteFramebuffer(fb)");
shouldBe("gl.getParameter(ext.DRAW_BUFFER0_WEBGL)", "gl.BACK");
}
function testShaders(tests, sub) {
tests.forEach(function(test) {
var shaders = [wtu.simpleVertexShader, wtu.replaceParams(wtu.getScript(test.fragmentShaderTemplate), sub)];
var program = wtu.setupProgram(gl, shaders, ["vPosition"], undefined, true);
var programLinkedSuccessfully = (program != null);
var expectedProgramToLinkSuccessfully = (test.expectFailure == true);
expectTrue(programLinkedSuccessfully != expectedProgramToLinkSuccessfully, test.msg);
gl.deleteProgram(program);
});
}
function runShadersTestDisabled() {
debug("");
debug("test shaders disabled");
var sub = {numDrawingBuffers: 1};
testShaders([
{ fragmentShaderTemplate: "fshaderMacroDisabled",
msg: "GL_EXT_draw_buffers should not be defined in GLSL",
},
{ fragmentShaderTemplate: "fshader",
msg: "#extension GL_EXT_draw_buffers should not be allowed in GLSL",
expectFailure: true,
},
], sub);
programWithMaxDrawBuffersEqualOne = createExtDrawBuffersProgram("fshaderBuiltInConstEnabled", sub);
wtu.setupUnitQuad(gl);
wtu.clearAndDrawUnitQuad(gl);
wtu.checkCanvas(gl, [0, 255, 0, 255], "should be green");
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no errors");
}
function runShadersTestEnabled() {
debug("");
debug("test shaders enabled");
var sub = {numDrawingBuffers: gl.getParameter(ext.MAX_DRAW_BUFFERS_WEBGL)};
testShaders([
{ fragmentShaderTemplate: "fshaderMacroEnabled",
msg: "GL_EXT_draw_buffers should be defined as 1 in GLSL",
},
{ fragmentShaderTemplate: "fshader",
msg: "fragment shader containing the #extension directive should compile",
},
], sub);
var program = createExtDrawBuffersProgram("fshaderBuiltInConstEnabled", sub);
wtu.setupUnitQuad(gl);
wtu.clearAndDrawUnitQuad(gl);
wtu.checkCanvas(gl, [0, 255, 0, 255], "should be green");
gl.deleteProgram(program);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no errors");
debug("");
debug("test that gl_MaxDrawBuffers is frozen at link time and enabling the extension won't change it.");
gl.useProgram(programWithMaxDrawBuffersEqualOne);
wtu.clearAndDrawUnitQuad(gl);
wtu.checkCanvas(gl, [0, 255, 0, 255], "should be green");
gl.deleteProgram(programWithMaxDrawBuffersEqualOne);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no errors");
}
function runAttachmentTestDisabled() {
debug("");
debug("test attachment disabled");
var tex = gl.createTexture();
var fb = gl.createFramebuffer();
gl.bindTexture(gl.TEXTURE_2D, tex);
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0 + 1, gl.TEXTURE_2D, tex, 0);
wtu.glErrorShouldBe(gl, gl.INVALID_ENUM, "should not be able to attach to gl.COLOR_ATTACHMENT1");
gl.deleteFramebuffer(fb);
gl.deleteTexture(tex);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no errors");
}
function makeArray(size, value) {
var array = []
for (var ii = 0; ii < size; ++ii) {
array.push(value);
}
return array;
}
function runAttachmentTestEnabled() {
debug("");
debug("test attachment enabled");
var maxDrawingBuffers = gl.getParameter(ext.MAX_DRAW_BUFFERS_WEBGL);
var maxColorAttachments = gl.getParameter(ext.MAX_COLOR_ATTACHMENTS_WEBGL);
var tex = gl.createTexture();
var fb = gl.createFramebuffer();
gl.bindTexture(gl.TEXTURE_2D, tex);
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0 + maxColorAttachments, gl.TEXTURE_2D, tex, 0);
wtu.glErrorShouldBe(gl, gl.INVALID_ENUM, "should not be able to attach pass the max attachment point: gl.COLOR_ATTACHMENT0 + " + maxColorAttachments);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0 + maxColorAttachments - 1, gl.TEXTURE_2D, tex, 0);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be able to attach to the max attachment point: gl.COLOR_ATTACHMENT0 + " + (maxColorAttachments - 1));
ext.drawBuffersWEBGL(makeArray(maxDrawingBuffers, gl.NONE));
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be able to call drawBuffersWEBGL with array NONE of size " + maxColorAttachments);
var bufs = drawBuffersUtils.makeColorAttachmentArray(maxDrawingBuffers);
ext.drawBuffersWEBGL(bufs);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be able to call drawBuffersWEBGL with array attachments of size " + maxColorAttachments);
bufs[0] = gl.NONE;
ext.drawBuffersWEBGL(bufs);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be able to call drawBuffersWEBGL with mixed array attachments of size " + maxColorAttachments);
if (maxDrawingBuffers > 1) {
bufs[0] = ext.COLOR_ATTACHMENT1_WEBGL;
bufs[1] = ext.COLOR_ATTACHMENT0_WEBGL;
ext.drawBuffersWEBGL(bufs);
wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "should not be able to call drawBuffersWEBGL with out of order attachments of size " + maxColorAttachments);
var bufs = drawBuffersUtils.makeColorAttachmentArray(Math.floor(maxDrawingBuffers / 2));
ext.drawBuffersWEBGL(bufs);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be able to call drawBuffersWEBGL with short array of attachments of size " + bufs.length);
}
gl.deleteFramebuffer(fb);
gl.deleteTexture(tex);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no errors");
}
function makeColorByIndex(index) {
var low = (index - 1) % 15 + 1;
var high = (index - 1) / 15;
var zeroOrOne = function(v) {
return v ? 1 : 0;
};
var oneOrTwo = function(v) {
return v ? 2 : 1;
}
var makeComponent = function(b0, b1, b2) {
return Math.floor(255 * zeroOrOne(b0) / oneOrTwo(b1) / oneOrTwo(b2));
};
return [
makeComponent(low & (1 << 0), high & (1 << 0), high & (1 << 4)),
makeComponent(low & (1 << 1), high & (1 << 1), high & (1 << 5)),
makeComponent(low & (1 << 2), high & (1 << 2), high & (1 << 6)),
makeComponent(low & (1 << 3), high & (1 << 3), high & (1 << 7)),
];
}
function runDrawTests() {
debug("");
debug("--------- draw tests -----------");
var fb = gl.createFramebuffer();
var fb2 = gl.createFramebuffer();
var halfFB1 = gl.createFramebuffer();
var halfFB2 = gl.createFramebuffer();
var endsFB = gl.createFramebuffer();
var middleFB = gl.createFramebuffer();
var maxDrawingBuffers = gl.getParameter(ext.MAX_DRAW_BUFFERS_WEBGL);
var maxUsable = drawBuffersUtils.getMaxUsableColorAttachments();
var half = Math.floor(maxUsable / 2);
var bufs = drawBuffersUtils.makeColorAttachmentArray(maxUsable);
var nones = makeArray(maxUsable, gl.NONE);
[fb, fb2, halfFB1, halfFB2, endsFB, middleFB].forEach(function(fbo) {
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
ext.drawBuffersWEBGL(bufs);
});
var checkProgram = wtu.setupTexturedQuad(gl);
var redProgram = wtu.setupProgram(gl, [wtu.simpleVertexShader, "fshaderRed"], ["vPosition"]);
var redProgramWithExtension = wtu.setupProgram(gl, [wtu.simpleVertexShader, "fshaderRedWithExtension"], ["vPosition"]);
var drawProgram = createExtDrawBuffersProgram("fshader", {numDrawingBuffers: maxDrawingBuffers});
var width = 64;
var height = 64;
var attachments = [];
// Makes 6 framebuffers.
// fb and fb2 have all the attachments.
// halfFB1 has the first half of the attachments
// halfFB2 has the second half of the attachments
// endsFB has the first and last attachments
// middleFB has all but the first and last attachments
for (var ii = 0; ii < maxUsable; ++ii) {
var tex = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, tex);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, width, height, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0 + ii, gl.TEXTURE_2D, tex, 0);
gl.bindFramebuffer(gl.FRAMEBUFFER, fb2);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0 + ii, gl.TEXTURE_2D, tex, 0);
gl.bindFramebuffer(gl.FRAMEBUFFER, ii < half ? halfFB1 : halfFB2);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0 + ii, gl.TEXTURE_2D, tex, 0);
gl.bindFramebuffer(gl.FRAMEBUFFER, (ii == 0 || ii == (maxUsable - 1)) ? endsFB : middleFB);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0 + ii, gl.TEXTURE_2D, tex, 0);
var location = gl.getUniformLocation(drawProgram, "u_colors[" + ii + "]");
var color = makeColorByIndex(ii + 1);
var floatColor = [color[0] / 255, color[1] / 255, color[2] / 255, color[3] / 255];
gl.uniform4fv(location, floatColor);
attachments.push({
texture: tex,
color: color
});
}
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
shouldBe("gl.checkFramebufferStatus(gl.FRAMEBUFFER)", "gl.FRAMEBUFFER_COMPLETE");
gl.bindFramebuffer(gl.FRAMEBUFFER, fb2);
shouldBe("gl.checkFramebufferStatus(gl.FRAMEBUFFER)", "gl.FRAMEBUFFER_COMPLETE");
var drawAndCheckAttachments = function(testFB, msg, testFn) {
debug("test clearing " + msg);
gl.bindFramebuffer(gl.FRAMEBUFFER, testFB);
attachments.forEach(function(attachment, index) {
debug("attachment: " + index + " = " + wtu.glEnumToString(gl, gl.getParameter(ext.DRAW_BUFFER0_WEBGL + index)) +
", " + wtu.glEnumToString(gl, gl.getFramebufferAttachmentParameter(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0 + index, gl.FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE)));
});
if (gl.checkFramebufferStatus(gl.FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE) {
debug("framebuffer not complete");
debug("");
return;
}
// Clear all the attachments
gl.bindFramebuffer(gl.FRAMEBUFFER, fb2);
gl.clearColor(0, 0, 0, 0);
gl.clear(gl.COLOR_BUFFER_BIT);
//drawBuffersUtils.checkAttachmentsForColorFn(attachments, function(attachment, index) {
// return [0, 0, 0, 0];
//});
//debug("--");
// Clear some attachments using testFB
gl.bindFramebuffer(gl.FRAMEBUFFER, testFB);
gl.clearColor(0, 1, 0, 1);
gl.clear(gl.COLOR_BUFFER_BIT);
drawBuffersUtils.checkAttachmentsForColorFn(attachments, function(attachment, index) {
return testFn(attachment, index) ? [0, 255, 0, 255] : [0, 0, 0, 0];
});
debug("test drawing to " + msg);
// Draw to some attachments using testFB
gl.useProgram(drawProgram);
gl.bindFramebuffer(gl.FRAMEBUFFER, testFB);
wtu.drawUnitQuad(gl);
drawBuffersUtils.checkAttachmentsForColorFn(attachments, function(attachment, index) {
return testFn(attachment, index) ? attachment.color : [0, 0, 0, 0];
});
};
gl.useProgram(drawProgram);
gl.bindFramebuffer(gl.FRAMEBUFFER, fb2);
ext.drawBuffersWEBGL(bufs);
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
ext.drawBuffersWEBGL(bufs);
wtu.drawUnitQuad(gl);
debug("test that each texture got the correct color.");
drawBuffersUtils.checkAttachmentsForColor(attachments);
debug("test clearing clears all the textures");
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
gl.clearColor(0, 1, 0, 1);
gl.clear(gl.COLOR_BUFFER_BIT);
drawBuffersUtils.checkAttachmentsForColor(attachments, [0, 255, 0, 255]);
debug("test a fragment shader writing to neither gl_FragColor nor gl_FragData does not touch attachments");
var noWriteProgram = wtu.setupProgram(gl, [wtu.simpleVertexShader, "fshaderNoWrite"], ["vPosition"]);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should be no GL error setting up the program");
if (!noWriteProgram) {
testFailed("Setup a program where fragment shader writes nothing failed");
} else {
gl.useProgram(noWriteProgram);
wtu.drawUnitQuad(gl);
wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "Active draw buffers with missing frag outputs.");
drawBuffersUtils.checkAttachmentsForColor(attachments, [0, 255, 0, 255]);
gl.deleteProgram(noWriteProgram);
}
debug("test that NONE draws nothing");
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
ext.drawBuffersWEBGL(nones);
gl.useProgram(redProgram);
wtu.clearAndDrawUnitQuad(gl);
drawBuffersUtils.checkAttachmentsForColor(attachments, [0, 255, 0, 255]);
debug("test that gl_FragColor does not broadcast unless extension is enabled in fragment shader");
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
ext.drawBuffersWEBGL(bufs);
gl.useProgram(redProgram);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no errors");
wtu.drawUnitQuad(gl);
wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "Active draw buffers with missing frag outputs.");
gl.colorMask(false, false, false, false);
wtu.drawUnitQuad(gl);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no errors when all 4 channels of color mask are disabled.");
gl.colorMask(false, true, false, false);
wtu.drawUnitQuad(gl);
wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "partially diabled color mask shall have no impact.");
gl.colorMask(true, true, true, true);
debug("test that gl_FragColor broadcasts if extension is enabled in fragment shader");
gl.clear(gl.COLOR_BUFFER_BIT);
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
ext.drawBuffersWEBGL(bufs);
gl.useProgram(redProgramWithExtension);
wtu.drawUnitQuad(gl);
drawBuffersUtils.checkAttachmentsForColor(attachments, [255, 0, 0, 255]);
if (maxUsable > 1) {
// First half of color buffers disable.
var bufs1 = drawBuffersUtils.makeColorAttachmentArray(maxUsable);
// Second half of color buffers disable.
var bufs2 = drawBuffersUtils.makeColorAttachmentArray(maxUsable);
// Color buffers with even indices disabled.
var bufs3 = drawBuffersUtils.makeColorAttachmentArray(maxUsable);
// Color buffers with odd indices disabled.
var bufs4 = drawBuffersUtils.makeColorAttachmentArray(maxUsable);
for (var ii = 0; ii < maxUsable; ++ii) {
if (ii < half) {
bufs1[ii] = gl.NONE;
} else {
bufs2[ii] = gl.NONE;
}
if (ii % 2) {
bufs3[ii] = gl.NONE;
} else {
bufs4[ii] = gl.NONE;
}
}
debug("test setting first half to NONE and clearing");
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
// We should clear all buffers rather than depending on the previous
// gl_FragColor broadcasts test to succeed and setting the colors.
ext.drawBuffersWEBGL(bufs);
gl.clearColor(1, 0, 0, 1);
gl.clear(gl.COLOR_BUFFER_BIT);
ext.drawBuffersWEBGL(bufs1);
gl.clearColor(0, 1, 0, 1);
gl.clear(gl.COLOR_BUFFER_BIT);
drawBuffersUtils.checkAttachmentsForColorFn(attachments, function(attachment, index) {
return index < half ? [255, 0, 0, 255] : [0, 255, 0, 255];
});
debug("test setting first half to NONE and drawing");
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
gl.useProgram(drawProgram);
wtu.drawUnitQuad(gl);
drawBuffersUtils.checkAttachmentsForColorFn(attachments, function(attachment, index) {
return index < half ? [255, 0, 0, 255] : attachment.color;
});
debug("test setting second half to NONE and clearing");
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
ext.drawBuffersWEBGL(bufs);
gl.clearColor(1, 0, 0, 1);
gl.clear(gl.COLOR_BUFFER_BIT);
ext.drawBuffersWEBGL(bufs2);
gl.clearColor(0, 0, 1, 1);
gl.clear(gl.COLOR_BUFFER_BIT);
drawBuffersUtils.checkAttachmentsForColorFn(attachments, function(attachment, index) {
return index < half ? [0, 0, 255, 255] : [255, 0, 0, 255];
});
debug("test setting second half to NONE and drawing");
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
gl.useProgram(drawProgram);
wtu.drawUnitQuad(gl);
drawBuffersUtils.checkAttachmentsForColorFn(attachments, function(attachment, index) {
return index < half ? attachment.color : [255, 0, 0, 255];
});
debug("test setting buffers with even indices to NONE and clearing");
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
ext.drawBuffersWEBGL(bufs);
gl.clearColor(1, 0, 0, 1);
gl.clear(gl.COLOR_BUFFER_BIT);
ext.drawBuffersWEBGL(bufs3);
gl.clearColor(1, 0, 1, 1);
gl.clear(gl.COLOR_BUFFER_BIT);
drawBuffersUtils.checkAttachmentsForColorFn(attachments, function(attachment, index) {
return (index % 2) ? [255, 0, 0, 255] : [255, 0, 255, 255];
});
debug("test setting buffers with odd indices to NONE and drawing");
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
ext.drawBuffersWEBGL(bufs);
gl.clearColor(0, 0, 0, 1);
gl.clear(gl.COLOR_BUFFER_BIT);
gl.useProgram(drawProgram);
ext.drawBuffersWEBGL(bufs4);
wtu.drawUnitQuad(gl);
drawBuffersUtils.checkAttachmentsForColorFn(attachments, function(attachment, index) {
return (index % 2 == 0) ? [0, 0, 0, 255] : attachment.color;
});
gl.bindFramebuffer(gl.FRAMEBUFFER, halfFB1);
ext.drawBuffersWEBGL(bufs);
drawAndCheckAttachments(
halfFB1, "framebuffer that only has first half of attachments",
function(attachment, index) {
return index < half;
});
gl.bindFramebuffer(gl.FRAMEBUFFER, halfFB2);
ext.drawBuffersWEBGL(bufs);
drawAndCheckAttachments(
halfFB2, "framebuffer that only has second half of attachments",
function(attachment, index) {
return index >= half;
});
if (maxUsable > 2) {
gl.bindFramebuffer(gl.FRAMEBUFFER, endsFB);
ext.drawBuffersWEBGL(bufs);
drawAndCheckAttachments(
endsFB, "framebuffer that only has first and last attachments",
function(attachment, index) {
return index == 0 || index == (maxUsable - 1);
});
gl.bindFramebuffer(gl.FRAMEBUFFER, middleFB);
ext.drawBuffersWEBGL(bufs);
drawAndCheckAttachments(
middleFB,
"framebuffer that has all but the first and last attachments",
function(attachment, index) {
return index != 0 && index != (maxUsable - 1);
});
}
}
debug("test switching between fbos does not affect any color attachment contents");
gl.bindFramebuffer(gl.FRAMEBUFFER, fb2);
ext.drawBuffersWEBGL(nones);
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
ext.drawBuffersWEBGL(bufs);
gl.clearColor(1, 0, 0, 1);
gl.clear(gl.COLOR_BUFFER_BIT);
drawBuffersUtils.checkAttachmentsForColor(attachments, [255, 0, 0, 255]);
// fb2 still has the NONE draw buffers from before, so this draw should be a no-op.
gl.bindFramebuffer(gl.FRAMEBUFFER, fb2);
gl.useProgram(drawProgram);
wtu.drawUnitQuad(gl);
drawBuffersUtils.checkAttachmentsForColor(attachments, [255, 0, 0, 255]);
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
gl.useProgram(drawProgram);
wtu.drawUnitQuad(gl);
drawBuffersUtils.checkAttachmentsForColor(attachments);
debug("test queries");
debug("check framebuffer with all attachments on");
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
for (var ii = 0; ii < maxUsable; ++ii) {
shouldBe("gl.getParameter(ext.DRAW_BUFFER0_WEBGL + " + ii + ")", "gl.COLOR_ATTACHMENT0 + " + ii);
}
debug("check framebuffer with all attachments off");
gl.bindFramebuffer(gl.FRAMEBUFFER, fb2);
for (var ii = 0; ii < maxUsable; ++ii) {
shouldBe("gl.getParameter(ext.DRAW_BUFFER0_WEBGL + " + ii + ")", "gl.NONE");
}
debug("test attachment size mis-match");
gl.bindTexture(gl.TEXTURE_2D, attachments[0].texture);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, width * 2, height, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
shouldBeTrue("gl.checkFramebufferStatus(gl.FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE");
gl.bindFramebuffer(gl.FRAMEBUFFER, fb2);
shouldBeTrue("gl.checkFramebufferStatus(gl.FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE");
gl.deleteFramebuffer(fb);
gl.deleteFramebuffer(fb2);
gl.deleteFramebuffer(halfFB1);
gl.deleteFramebuffer(halfFB2);
attachments.forEach(function(attachment) {
gl.deleteTexture(attachment.texture);
});
gl.deleteProgram(checkProgram);
gl.deleteProgram(redProgram);
gl.deleteProgram(redProgramWithExtension);
gl.deleteProgram(drawProgram);
}
function runPreserveTests() {
debug("");
debug("--------- preserve tests -----------");
debug("Testing that frame buffer is cleared after compositing");
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
gl.clearColor(1, 1, 0, 1);
gl.clear(gl.COLOR_BUFFER_BIT);
wtu.checkCanvas(gl, [255, 255, 0, 255], "should be yellow");
// set the draw buffer to NONE
ext.drawBuffersWEBGL([gl.NONE]);
gl.clearColor(1, 0, 1, 1);
gl.clear(gl.COLOR_BUFFER_BIT);
// make sure the canvas is still clear
wtu.checkCanvas(gl, [255, 255, 0, 255], "should be yellow");
wtu.waitForComposite(function() {
gl.clearColor(1, 0, 0, 1);
gl.clear(gl.COLOR_BUFFER_BIT);
wtu.checkCanvas(gl, [0, 0, 0, 0], "should be clear");
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no errors");
runEndTests();
});
}
function runEndTests() {
// Create new context and verify shader tests with no extension still succeeds.
debug("");
debug("Testing new context with no extension");
gl = wtu.create3DContext();
if (!gl) {
testFailed("New WebGL context does not exist");
} else {
testPassed("New WebGL context exists");
runEnumTestDisabled();
runShadersTestDisabled();
runAttachmentTestDisabled();
}
finishTest();
}
</script>
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</html>