-
-
Notifications
You must be signed in to change notification settings - Fork 4.7k
/
ContextSystem.ts
367 lines (312 loc) · 11.4 KB
/
ContextSystem.ts
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
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
import { ENV } from '@pixi/constants';
import { extensions, ExtensionType } from '@pixi/extensions';
import { settings } from '../settings';
import type { ExtensionMetadata } from '@pixi/extensions';
import type { ICanvas } from '@pixi/settings';
import type { ISystem } from '../system/ISystem';
import type { Renderer } from '../Renderer';
import type { WebGLExtensions } from './WebGLExtensions';
import type { IRenderingContext } from '../IRenderer';
let CONTEXT_UID_COUNTER = 0;
export interface ISupportDict
{
uint32Indices: boolean;
}
export interface ContextOptions
{
context?: IRenderingContext;
/**
* Use premultipliedAlpha instead
* @deprecated since 7.0.0
*/
useContextAlpha?: boolean | 'notMultiplied';
premultipliedAlpha?: boolean;
powerPreference?: WebGLPowerPreference;
preserveDrawingBuffer?: boolean;
antialias?: boolean;
}
/**
* System plugin to the renderer to manage the context.
* @memberof PIXI
*/
export class ContextSystem implements ISystem<ContextOptions>
{
/** @ignore */
static extension: ExtensionMetadata = {
type: ExtensionType.RendererSystem,
name: 'context',
};
/**
* Either 1 or 2 to reflect the WebGL version being used.
* @readonly
*/
public webGLVersion: number;
/**
* Features supported by current context.
* @type {object}
* @readonly
* @property {boolean} uint32Indices - Support for 32-bit indices buffer.
*/
readonly supports: ISupportDict;
preserveDrawingBuffer: boolean;
powerPreference: WebGLPowerPreference;
/**
* Pass-thru setting for the canvas' context `alpha` property. This is typically
* not something you need to fiddle with. If you want transparency, use `backgroundAlpha`.
* @member {boolean}
* @deprecated since 7.0.0
*/
useContextAlpha: boolean | 'notMultiplied';
protected CONTEXT_UID: number;
protected gl: IRenderingContext;
/**
* Extensions available.
* @type {object}
* @readonly
* @property {WEBGL_draw_buffers} drawBuffers - WebGL v1 extension
* @property {WEBGL_depth_texture} depthTexture - WebGL v1 extension
* @property {OES_texture_float} floatTexture - WebGL v1 extension
* @property {WEBGL_lose_context} loseContext - WebGL v1 extension
* @property {OES_vertex_array_object} vertexArrayObject - WebGL v1 extension
* @property {EXT_texture_filter_anisotropic} anisotropicFiltering - WebGL v1 and v2 extension
*/
public extensions: WebGLExtensions;
private renderer: Renderer;
/** @param renderer - The renderer this System works for. */
constructor(renderer: Renderer)
{
this.renderer = renderer;
this.webGLVersion = 1;
this.extensions = {};
this.supports = {
uint32Indices: false,
};
// Bind functions
this.handleContextLost = this.handleContextLost.bind(this);
this.handleContextRestored = this.handleContextRestored.bind(this);
}
/**
* `true` if the context is lost
* @readonly
*/
get isLost(): boolean
{
return (!this.gl || this.gl.isContextLost());
}
/**
* Handles the context change event.
* @param {WebGLRenderingContext} gl - New WebGL context.
*/
protected contextChange(gl: IRenderingContext): void
{
this.gl = gl;
this.renderer.gl = gl;
this.renderer.CONTEXT_UID = CONTEXT_UID_COUNTER++;
}
init(options: ContextOptions): void
{
/*
* The options passed in to create a new WebGL context.
*/
if (options.context)
{
this.initFromContext(options.context);
}
else
{
const alpha = this.renderer.background.alpha < 1;
const premultipliedAlpha = options.premultipliedAlpha ?? true;
this.preserveDrawingBuffer = options.preserveDrawingBuffer;
this.useContextAlpha = options.useContextAlpha;
this.powerPreference = options.powerPreference;
this.initFromOptions({
alpha,
premultipliedAlpha,
antialias: options.antialias,
stencil: true,
preserveDrawingBuffer: options.preserveDrawingBuffer,
powerPreference: options.powerPreference,
});
}
}
/**
* Initializes the context.
* @protected
* @param {WebGLRenderingContext} gl - WebGL context
*/
initFromContext(gl: IRenderingContext): void
{
this.gl = gl;
this.validateContext(gl);
this.renderer.gl = gl;
this.renderer.CONTEXT_UID = CONTEXT_UID_COUNTER++;
this.renderer.runners.contextChange.emit(gl);
const view = this.renderer.view;
if (view.addEventListener !== undefined)
{
view.addEventListener('webglcontextlost', this.handleContextLost, false);
view.addEventListener('webglcontextrestored', this.handleContextRestored, false);
}
}
/**
* Initialize from context options
* @protected
* @see https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement/getContext
* @param {object} options - context attributes
*/
initFromOptions(options: WebGLContextAttributes): void
{
const gl = this.createContext(this.renderer.view, options);
this.initFromContext(gl);
}
/**
* Helper class to create a WebGL Context
* @param canvas - the canvas element that we will get the context from
* @param options - An options object that gets passed in to the canvas element containing the
* context attributes
* @see https://developer.mozilla.org/en/docs/Web/API/HTMLCanvasElement/getContext
* @returns {WebGLRenderingContext} the WebGL context
*/
createContext(canvas: ICanvas, options: WebGLContextAttributes): IRenderingContext
{
let gl;
if (settings.PREFER_ENV >= ENV.WEBGL2)
{
gl = canvas.getContext('webgl2', options);
}
if (gl)
{
this.webGLVersion = 2;
}
else
{
this.webGLVersion = 1;
gl = canvas.getContext('webgl', options) || canvas.getContext('experimental-webgl', options);
if (!gl)
{
// fail, not able to get a context
throw new Error('This browser does not support WebGL. Try using the canvas renderer');
}
}
this.gl = gl as IRenderingContext;
this.getExtensions();
return this.gl;
}
/** Auto-populate the {@link PIXI.ContextSystem.extensions extensions}. */
protected getExtensions(): void
{
// time to set up default extensions that Pixi uses.
const { gl } = this;
const common = {
loseContext: gl.getExtension('WEBGL_lose_context'),
anisotropicFiltering: gl.getExtension('EXT_texture_filter_anisotropic'),
floatTextureLinear: gl.getExtension('OES_texture_float_linear'),
s3tc: gl.getExtension('WEBGL_compressed_texture_s3tc'),
s3tc_sRGB: gl.getExtension('WEBGL_compressed_texture_s3tc_srgb'), // eslint-disable-line camelcase
etc: gl.getExtension('WEBGL_compressed_texture_etc'),
etc1: gl.getExtension('WEBGL_compressed_texture_etc1'),
pvrtc: gl.getExtension('WEBGL_compressed_texture_pvrtc')
|| gl.getExtension('WEBKIT_WEBGL_compressed_texture_pvrtc'),
atc: gl.getExtension('WEBGL_compressed_texture_atc'),
astc: gl.getExtension('WEBGL_compressed_texture_astc')
};
if (this.webGLVersion === 1)
{
Object.assign(this.extensions, common, {
drawBuffers: gl.getExtension('WEBGL_draw_buffers'),
depthTexture: gl.getExtension('WEBGL_depth_texture'),
vertexArrayObject: gl.getExtension('OES_vertex_array_object')
|| gl.getExtension('MOZ_OES_vertex_array_object')
|| gl.getExtension('WEBKIT_OES_vertex_array_object'),
uint32ElementIndex: gl.getExtension('OES_element_index_uint'),
// Floats and half-floats
floatTexture: gl.getExtension('OES_texture_float'),
floatTextureLinear: gl.getExtension('OES_texture_float_linear'),
textureHalfFloat: gl.getExtension('OES_texture_half_float'),
textureHalfFloatLinear: gl.getExtension('OES_texture_half_float_linear'),
});
}
else if (this.webGLVersion === 2)
{
Object.assign(this.extensions, common, {
// Floats and half-floats
colorBufferFloat: gl.getExtension('EXT_color_buffer_float')
});
}
}
/**
* Handles a lost webgl context
* @param {WebGLContextEvent} event - The context lost event.
*/
protected handleContextLost(event: WebGLContextEvent): void
{
// Prevent default to be able to restore the context
event.preventDefault();
// Restore the context after this event has exited
setTimeout(() =>
{
if (this.gl.isContextLost() && this.extensions.loseContext)
{
this.extensions.loseContext.restoreContext();
}
}, 0);
}
/** Handles a restored webgl context. */
protected handleContextRestored(): void
{
this.renderer.runners.contextChange.emit(this.gl);
}
destroy(): void
{
const view = this.renderer.view;
this.renderer = null;
// remove listeners
if (view.removeEventListener !== undefined)
{
view.removeEventListener('webglcontextlost', this.handleContextLost);
view.removeEventListener('webglcontextrestored', this.handleContextRestored);
}
this.gl.useProgram(null);
if (this.extensions.loseContext)
{
this.extensions.loseContext.loseContext();
}
}
/** Handle the post-render runner event. */
protected postrender(): void
{
if (this.renderer.objectRenderer.renderingToScreen)
{
this.gl.flush();
}
}
/**
* Validate context.
* @param {WebGLRenderingContext} gl - Render context.
*/
protected validateContext(gl: IRenderingContext): void
{
const attributes = gl.getContextAttributes();
const isWebGl2 = 'WebGL2RenderingContext' in globalThis && gl instanceof globalThis.WebGL2RenderingContext;
if (isWebGl2)
{
this.webGLVersion = 2;
}
// this is going to be fairly simple for now.. but at least we have room to grow!
if (attributes && !attributes.stencil)
{
/* eslint-disable max-len, no-console */
console.warn('Provided WebGL context does not have a stencil buffer, masks may not render correctly');
/* eslint-enable max-len, no-console */
}
const hasuint32 = isWebGl2 || !!(gl as WebGLRenderingContext).getExtension('OES_element_index_uint');
this.supports.uint32Indices = hasuint32;
if (!hasuint32)
{
/* eslint-disable max-len, no-console */
console.warn('Provided WebGL context does not support 32 index buffer, complex graphics may not render correctly');
/* eslint-enable max-len, no-console */
}
}
}
extensions.add(ContextSystem);