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<!DOCTYPE HTML>
<title>WebGL test: Hidden depth/stencil passes without a depth/stencil buffer respectively</title>
<script src='/tests/SimpleTest/SimpleTest.js'></script>
<link rel='stylesheet' href='/tests/SimpleTest/test.css'>
<script src='webgl-util.js'></script>
<body>
<script id='vs' type='x-shader/x-vertex'>
void main(void) {
gl_PointSize = 1.0; // Note that this is undefined if we don't write to it!
gl_Position = vec4(vec3(0), 1);
}
</script>
<script id='fs' type='x-shader/x-fragment'>
precision mediump float;
void main(void) {
gl_FragColor = vec4(0, 1, 0, 1);
}
</script>
<script>
function ColorString(arr) {
return '[' + arr[0] + ', ' + arr[1] + ', ' + arr[2] + ', ' + arr[3] + ']';
}
function DrawAndCheck(gl, infoPrefix, refColorStr) {
gl.viewport(0, 0, 1, 1);
gl.clearColor(1, 0, 0, 1);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT | gl.STENCIL_BUFFER_BIT);
gl.drawArrays(gl.POINTS, 0, 1);
var pixel = new Uint8Array(4);
gl.readPixels(0, 0, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, pixel);
var pixelStr = ColorString(pixel);
ok(pixelStr == refColorStr, infoPrefix + pixelStr + ' should be ' + refColorStr);
}
function TestCurrent(gl, attribs, infoPrefix) {
infoPrefix = infoPrefix + JSON.stringify(attribs) + ': ';
var CLEAR_COLOR = ColorString([255, 0, 0, 255]);
var DRAW_COLOR = ColorString([0, 255, 0, 255]);
gl.disable(gl.DEPTH_TEST);
gl.disable(gl.STENCIL_TEST);
DrawAndCheck(gl, infoPrefix + 'initial: ', DRAW_COLOR);
if (!attribs.depth) {
gl.enable(gl.DEPTH_TEST);
gl.depthFunc(gl.NEVER);
gl.disable(gl.STENCIL_TEST);
// Depth test is enabled, and should pass NEVER.
// Since there is no depth buffer, the depth test is not run.
// Stencil test is disabled.
DrawAndCheck(gl, infoPrefix + 'no-depth: ', DRAW_COLOR);
}
if (!attribs.stencil) {
gl.disable(gl.DEPTH_TEST);
gl.enable(gl.STENCIL_TEST);
gl.stencilFunc(gl.NEVER, 0, 0);
// Depth test is disabled.
// Stencil test is enabled, and should pass NEVER.
// Since there is no stencil buffer, the stencil test is not run.
DrawAndCheck(gl, infoPrefix + 'no-stencil: ', DRAW_COLOR);
}
}
function TestBackbuffer(requestedAttribs) {
var canvas = document.createElement('canvas');
canvas.width = 1;
canvas.height = 1;
var gl = canvas.getContext('experimental-webgl', requestedAttribs);
if (!gl) {
ok(true, 'WebGL doesn\'t work, skipping test.');
return;
}
ok(gl.drawingBufferWidth == 1 && gl.drawingBufferHeight == 1,
'backbuffer should be 1x1');
var prog = WebGLUtil.createProgramByIds(gl, 'vs', 'fs');
gl.useProgram(prog);
var attribs = {
depth: gl.getContextAttributes().depth,
stencil: gl.getContextAttributes().stencil,
};
TestCurrent(gl, attribs, 'Backbuffer: ');
}
function TestUserFB() {
var canvas = document.createElement('canvas');
var gl = canvas.getContext('experimental-webgl');
if (!gl) {
ok(true, 'WebGL doesn\'t work, skipping test.');
return;
}
var prog = WebGLUtil.createProgramByIds(gl, 'vs', 'fs');
gl.useProgram(prog);
var rb = gl.createRenderbuffer();
gl.bindRenderbuffer(gl.RENDERBUFFER, rb);
gl.renderbufferStorage(gl.RENDERBUFFER, gl.RGBA4, 1, 1);
var fb = gl.createFramebuffer();
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.RENDERBUFFER, rb);
var depthRB = gl.createRenderbuffer();
gl.bindRenderbuffer(gl.RENDERBUFFER, depthRB);
gl.renderbufferStorage(gl.RENDERBUFFER, gl.DEPTH_COMPONENT16, 1, 1);
var stencilRB = gl.createRenderbuffer();
gl.bindRenderbuffer(gl.RENDERBUFFER, stencilRB);
gl.renderbufferStorage(gl.RENDERBUFFER, gl.STENCIL_INDEX8, 1, 1);
do {
gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT, gl.RENDERBUFFER, depthRB);
gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.STENCIL_ATTACHMENT, gl.RENDERBUFFER, null);
var status = gl.checkFramebufferStatus(gl.FRAMEBUFFER);
if (status != gl.FRAMEBUFFER_COMPLETE) {
ok(true, 'Depth-only user FB is incomplete. This is allowed.');
break;
}
TestCurrent(gl, {depth: true, stencil: false}, 'Depth-only user FB');
} while (false);
do {
gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT, gl.RENDERBUFFER, null);
gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.STENCIL_ATTACHMENT, gl.RENDERBUFFER, stencilRB);
var status = gl.checkFramebufferStatus(gl.FRAMEBUFFER);
if (status != gl.FRAMEBUFFER_COMPLETE) {
ok(true, 'Stencil-only user FB is incomplete. This is allowed.');
break;
}
TestCurrent(gl, {depth: false, stencil: true}, 'Stencil-only user FB');
} while (false);
}
(function(){
TestBackbuffer({depth: true, stencil: false});
TestBackbuffer({depth: false, stencil: true});
TestUserFB();
})();
</script>
</body>
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