1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
|
<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/webxr_util.js"></script>
<script src="resources/webxr_test_constants.js"></script>
<script>
let immersiveTestName = "Ensure that the framebuffer given by the WebGL layer" +
" works with stencil for immersive";
let nonImmersiveTestName = "Ensure that the framebuffer given by the WebGL layer" +
" works with stencil for non-immersive";
let fakeDeviceInitParams = TRACKED_IMMERSIVE_DEVICE;
function createShader(gl, type, source) {
var shader = gl.createShader(type);
gl.shaderSource(shader, source);
gl.compileShader(shader);
var success = gl.getShaderParameter(shader, gl.COMPILE_STATUS);
if (success) {
return shader;
}
gl.deleteShader(shader);
}
function createProgram(gl, vertexShader, fragmentShader) {
var program = gl.createProgram();
gl.attachShader(program, vertexShader);
gl.attachShader(program, fragmentShader);
gl.linkProgram(program);
var success = gl.getProgramParameter(program, gl.LINK_STATUS);
if (success) {
return program;
}
gl.deleteProgram(program);
}
let testFunction =
(session, fakeDeviceController, t, sessionObjects) => new Promise((resolve, reject) => {
const gl = sessionObjects.gl;
const webglLayer = sessionObjects.glLayer;
const xrFramebuffer = webglLayer.framebuffer;
const webglCanvas = sessionObjects.gl.canvas;
session.requestAnimationFrame((time, xrFrame) => {
t.step(() => {
// Make sure we're starting with a clean error slate.
gl.getError();
assert_equals(gl.getError(), gl.NO_ERROR, "Should not initially have any errors");
if (session.mode === 'inline') {
// Creating a layer with an inline session should return a framebuffer of
// null, and as such most of these tests won't apply.
assert_equals(xrFramebuffer, null, 'inline, fbo = null');
// We need to set canvas size here for inline session testing, since
// xrFramebuffer is null.
webglCanvas.width = webglCanvas.height = 300;
gl.bindFramebuffer(gl.FRAMEBUFFER, xrFramebuffer);
assert_equals(gl.getError(), gl.NO_ERROR, "Binding default framebuffer for inline session");
} else {
assert_not_equals(xrFramebuffer, null, 'immersive, fbo != null');
gl.bindFramebuffer(gl.FRAMEBUFFER, xrFramebuffer);
assert_equals(gl.getError(), gl.NO_ERROR, "Binding WebGLLayer framebuffer");
}
// Framebuffer status must be complete inside of a XR frame callback.
assert_equals(gl.checkFramebufferStatus(gl.FRAMEBUFFER), gl.FRAMEBUFFER_COMPLETE, "FBO complete");
});
gl.clearColor(1, 1, 1, 1);
const vs = `
attribute vec4 position;
uniform mat4 matrix;
void main() {
gl_Position = matrix * position;
}
`;
const fs = `
precision mediump float;
uniform vec4 color;
void main() {
gl_FragColor = color;
}
`;
const vertexShader = createShader(gl, gl.VERTEX_SHADER, vs);
const fragmentShader = createShader(gl, gl.FRAGMENT_SHADER, fs);
const program = createProgram(gl, vertexShader, fragmentShader);
const posLoc = gl.getAttribLocation(program, 'position');
const matLoc = gl.getUniformLocation(program, 'matrix');
const colorLoc = gl.getUniformLocation(program, 'color');
const buf = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, buf);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([
0, -1,
1, 1,
-1, 1,
]), gl.STATIC_DRAW);
gl.enableVertexAttribArray(posLoc);
gl.vertexAttribPointer(
posLoc, // attribute location
2, // 2 value per vertex
gl.FLOAT, // 32bit floating point values
false, // don't normalize
0, // stride (0 = base on type and size)
0, // offset into buffer
);
let xrViewport;
if (session.mode == 'inline') {
xrViewport = { x: 0, y: 0, width: webglCanvas.width, height: webglCanvas.height };
} else {
xrViewport = { x: 0, y: 0, width: webglLayer.framebufferWidth, height: webglLayer.framebufferHeight };
}
gl.viewport(xrViewport.x, xrViewport.y, xrViewport.width, xrViewport.height);
gl.scissor(xrViewport.x, xrViewport.y, xrViewport.width, xrViewport.height);
// clear the stencil to 0 (the default)
gl.stencilMask(0xFF);
gl.clearStencil(0x0);
gl.disable( gl.SCISSOR_TEST );
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT | gl.STENCIL_BUFFER_BIT);
gl.useProgram(program);
let m4 = [1, 0, 0, 0,
0, 1, 0, 0,
0, 0, 1, 0,
0, 0, 0, 1];
// turn on the stencil
gl.enable(gl.STENCIL_TEST);
// Drawing into a stencil, always passes, ref val 1, mask 0xFF
gl.stencilFunc(
gl.ALWAYS,
1,
0xFF,
);
// Set it to replace with the ref val (which is 1)
gl.stencilOp(
gl.KEEP, // stencil test fails
gl.KEEP, // depth test fails
gl.REPLACE, // both tests pass
);
m4[0] = 0.2; m4[5] = 0.2; // scale x and y
// draw a white triangle
gl.uniform4fv(colorLoc, [1, 1, 1, 1]); // white
gl.uniformMatrix4fv(matLoc, false, m4);
gl.colorMask(false, false, false, false);
gl.drawArrays(gl.TRIANGLES, 0, 3);
gl.colorMask(true, true, true, true);
// Stencil must be 0
gl.stencilFunc(
gl.EQUAL,
0,
0xFF,
);
// keep stencil unmodified during the draw pass
gl.stencilOp(
gl.KEEP, // stencil test fails
gl.KEEP, // depth test fails
gl.KEEP, // both tests pass
);
m4[0] = 0.9; m4[5] = -0.9; // scale x and y
// draw a large green triangle
gl.uniform4fv(colorLoc, [0, 1, 0, 1]); // green
gl.uniformMatrix4fv(matLoc, false, m4);
gl.drawArrays(gl.TRIANGLES, 0, 3);
gl.flush();
gl.finish();
let pixels = new Uint8Array(4);
// check that the main color is used correctly (green)
pixels[0] = pixels[1] = pixels[2] = pixels[3] = 30;
gl.readPixels(xrViewport.x + xrViewport.width / 2, xrViewport.y + xrViewport.height/4, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, pixels);
if (pixels[0] == 0x0 && pixels[1] == 0xFF && pixels[2] == 0x0) { // green?
// PASSED.
} else if (pixels[0] == 0xFF && pixels[1] == 0xFF && pixels[2] == 0xFF) { // white?
reject("Failed, white detected, must be green");
} else {
reject("Failed, readPixels (1) didn't work, gl error = " + gl.getError() + ", pixel = " +pixels[0] + " " +pixels[1] + " " +pixels[2]);
}
// check if stencil worked, i.e. white pixels in the center
pixels[0] = pixels[1] = pixels[2] = pixels[3] = 20;
gl.readPixels(xrViewport.x + xrViewport.width / 2, xrViewport.y + xrViewport.height/2, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, pixels);
if (pixels[0] == 0xFF && pixels[1] == 0xFF && pixels[2] == 0xFF) { // white?
// PASSED.
} else if (pixels[0] == 0x0 && pixels[1] == 0xFF && pixels[2] == 0x0) { // green?
reject("Failed, green detected, must be white");
} else {
reject("Failed, readPixels (2) didn't work, gl error = " + gl.getError() + ", pixel = " +pixels[0] + " " +pixels[1] + " " +pixels[2]);
}
// Finished.
resolve();
});
});
const gl_props = { antialias: false, alpha: false, stencil: true, depth: true };
// mac has issues with readPixels from the default fbo.
// skipping this test for Mac.
if (navigator.platform.indexOf("Mac") == -1) {
xr_session_promise_test(
nonImmersiveTestName, testFunction, fakeDeviceInitParams, 'inline', {}, {}, gl_props, gl_props);
}
xr_session_promise_test(
immersiveTestName, testFunction, fakeDeviceInitParams, 'immersive-vr', {}, {}, gl_props, gl_props);
</script>
|
