-
Notifications
You must be signed in to change notification settings - Fork 2
/
Copy pathquad_blur.html
368 lines (298 loc) · 12 KB
/
quad_blur.html
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
368
<!-- vim: sw=4 ts=4 expandtab smartindent ft=javascript
-->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title>WebGL Demo</title>
<style> document, body { margin: 0px; padding: 0px; overflow: hidden; } </style>
</head>
<body>
<canvas id="inspectorGraphCanvas"></canvas>
<script>
function lerp(v0, v1, t) { return (1 - t) * v0 + t * v1; }
function inv_lerp(min, max, p) { return (p - min) / (max - min); }
function mat4_create() {
let out = new Float32Array(16);
out[0] = 1;
out[5] = 1;
out[10] = 1;
out[15] = 1;
return out;
}
function mat4_ortho(out, left, right, bottom, top, near, far) {
let lr = 1 / (left - right);
let bt = 1 / (bottom - top);
let nf = 1 / (near - far);
out[0] = -2 * lr;
out[1] = 0;
out[2] = 0;
out[3] = 0;
out[4] = 0;
out[5] = -2 * bt;
out[6] = 0;
out[7] = 0;
out[8] = 0;
out[9] = 0;
out[10] = 2 * nf;
out[11] = 0;
out[12] = (left + right) * lr;
out[13] = (top + bottom) * bt;
out[14] = (far + near) * nf;
out[15] = 1;
return out;
}
function mat4_transform_vec4(out, a, m) {
let x = a[0], y = a[1], z = a[2], w = a[3];
out[0] = m[0] * x + m[4] * y + m[8] * z + m[12] * w;
out[1] = m[1] * x + m[5] * y + m[9] * z + m[13] * w;
out[2] = m[2] * x + m[6] * y + m[10] * z + m[14] * w;
out[3] = m[3] * x + m[7] * y + m[11] * z + m[15] * w;
return out;
}
const graphCanvas = document.getElementById('inspectorGraphCanvas');
const gl = graphCanvas.getContext('webgl2', {antialias: true});
if (!gl) { alert('Failed to initialize WebGL'); }
let render_targets = [
{ tex: null, fb: null },
{ tex: null, fb: null },
];
let pMatrix = mat4_create();
let viewMatrix = mat4_create();
(window.onresize = () => {
graphCanvas.width = window.innerWidth;
graphCanvas.height = window.innerHeight;
/* account for e.g. high-retina macbook screens */
if (window.devicePixelRatio > 1) {
graphCanvas.style.width = `${graphCanvas.width}px`;
graphCanvas.style.height = `${graphCanvas.height}px`;
graphCanvas.width *= window.devicePixelRatio;
graphCanvas.height *= window.devicePixelRatio;
}
pMatrix = mat4_ortho(pMatrix, 0, gl.canvas.width, gl.canvas.height, 0, 1, -1);
gl.viewport(
0,
0,
graphCanvas.width,
graphCanvas.height
);
/* create scene-sized render-target for post-processing fx (like shadows) */
for (const target of render_targets) {
if (target.tex) gl.deleteTexture( target.tex);
if (target.fb ) gl.deleteFramebuffer(target.fb );
target.tex = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, target.tex);
// define size and format of level 0
gl.texImage2D(
gl.TEXTURE_2D,
/* level, */ 0,
/* internalFormat, */ gl.RGBA,
/* width, */ graphCanvas.width,
/* height, */ graphCanvas.height,
/* border, */ 0,
/* format, */ gl.RGBA,
/* type, */ gl.UNSIGNED_BYTE,
/* data */ null
);
// set the filtering so we don't need mips
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
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);
target.fb = gl.createFramebuffer();
gl.bindFramebuffer(gl.FRAMEBUFFER, target.fb);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, target.tex, 0);
}
})();
const geo_vbuf_pos = gl.createBuffer();
const geo_vbuf_color = gl.createBuffer();
const geo_ibuf = gl.createBuffer();
let shaders;
/* compile shaders */
{
const vsGeo = `
attribute vec3 a_pos;
attribute vec4 a_color;
uniform mat4 u_matrix;
varying vec4 v_color;
void main() {
gl_Position = u_matrix * vec4(a_pos.xyz, 1);
v_color = a_color;
}`;
const fsGeo = `
precision mediump float;
varying vec4 v_color;
void main() {
gl_FragColor = v_color;
}`;
const vsFullscreenBlur = `#version 300 es
precision mediump float;
out vec2 v_texcoord;
void main(void) {
float x = float((gl_VertexID & 1) << 2);
float y = float((gl_VertexID & 2) << 1);
v_texcoord.x = x * 0.5;
v_texcoord.y = y * 0.5;
gl_Position = vec4(x - 1.0, y - 1.0, 0, 1);
}
`;
const fsFullscreenBlur = `#version 300 es
precision mediump float;
uniform sampler2D u_texture;
uniform vec2 u_direction;
in vec2 v_texcoord;
out vec4 frag_color;
void main(void) {
vec2 one_pixel = u_direction*(vec2(1) / vec2(textureSize(u_texture, 0)));
frag_color = texture(u_texture, v_texcoord) * 0.2270270270;
frag_color += texture(u_texture, v_texcoord + one_pixel ) * 0.1945945946;
frag_color += texture(u_texture, v_texcoord - one_pixel ) * 0.1945945946;
frag_color += texture(u_texture, v_texcoord + one_pixel*2.0) * 0.1216216216;
frag_color += texture(u_texture, v_texcoord - one_pixel*2.0) * 0.1216216216;
frag_color += texture(u_texture, v_texcoord + one_pixel*3.0) * 0.0540540541;
frag_color += texture(u_texture, v_texcoord - one_pixel*3.0) * 0.0540540541;
frag_color += texture(u_texture, v_texcoord + one_pixel*4.0) * 0.0162162162;
frag_color += texture(u_texture, v_texcoord - one_pixel*4.0) * 0.0162162162;
}
`;
function createProgram(gl, vertexSource, fragmentSource) {
function createShader(gl, type, source) {
const shader = gl.createShader(type);
gl.shaderSource(shader, source);
gl.compileShader(shader);
if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
throw new Error(gl.getShaderInfoLog(shader));
}
return shader;
}
const program = gl.createProgram();
const vertexShader = createShader(gl, gl.VERTEX_SHADER, vertexSource);
const fragmentShader = createShader(gl, gl.FRAGMENT_SHADER, fragmentSource);
gl.attachShader(program, vertexShader);
gl.attachShader(program, fragmentShader);
gl.linkProgram(program);
if (!gl.getProgramParameter(program, gl.LINK_STATUS)) {
throw new Error(gl.getProgramInfoLog(program));
}
const wrapper = {program};
const numAttributes = gl.getProgramParameter(program, gl.ACTIVE_ATTRIBUTES);
for (let i = 0; i < numAttributes; i++) {
const attribute = gl.getActiveAttrib(program, i);
wrapper[attribute.name] = gl.getAttribLocation(program, attribute.name);
}
const numUniforms = gl.getProgramParameter(program, gl.ACTIVE_UNIFORMS);
for (let i = 0; i < numUniforms; i++) {
const uniform = gl.getActiveUniform(program, i);
wrapper[uniform.name] = gl.getUniformLocation(program, uniform.name);
}
return wrapper;
}
shaders = {
fullscreenBlur: createProgram(gl, vsFullscreenBlur, fsFullscreenBlur),
geo : createProgram(gl, vsGeo , fsGeo ),
}
}
requestAnimationFrame(function frame(timestamp) {
requestAnimationFrame(frame);
const geo_idx = [];
const geo_pos = [];
const geo_color = [];
let view = viewMatrix;
function drawSquare( min_x, min_y, max_x, max_y, color ) {
geo_color.push(
color[0], color[1], color[2], color[3],
color[0], color[1], color[2], color[3],
color[0], color[1], color[2], color[3],
color[0], color[1], color[2], color[3]
)
const vbuf_i = geo_pos.length / 3;
const p = [0, 0, 0, 1];
p[0] = max_x; p[1] = min_y; mat4_transform_vec4(p, p, view); geo_pos.push(p[0], p[1], 0.1);
p[0] = min_x; p[1] = min_y; mat4_transform_vec4(p, p, view); geo_pos.push(p[0], p[1], 0.1);
p[0] = min_x; p[1] = max_y; mat4_transform_vec4(p, p, view); geo_pos.push(p[0], p[1], 0.1);
p[0] = max_x; p[1] = max_y; mat4_transform_vec4(p, p, view); geo_pos.push(p[0], p[1], 0.1);
geo_idx.push(vbuf_i + 0, vbuf_i + 1, vbuf_i + 2, vbuf_i + 2, vbuf_i + 3, vbuf_i + 0);
}
/* set up premultiplied alpha */
gl.blendFuncSeparate(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA, gl.ONE, gl.ONE);
gl.enable(gl.BLEND);
gl.enable(gl.DEPTH_TEST);
gl.depthFunc(gl.LEQUAL);
/* clear all */
gl.clearColor(1, 1, 1, 1);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
{
const rainbow = [
/* red, */ [255, 0, 0, 255],
/* orange, */ [255, 100, 0, 255],
/* yellow, */ [255, 255, 0, 255],
/* green, */ [ 0, 255, 0, 255],
/* blue, */ [ 0, 0, 255, 255],
/* purple */ [255, 0, 255, 255]
];
/* desaturate */
for (const color of rainbow) {
color[0] = (color[0] + 255*2) * 0.33;
color[1] = (color[1] + 255*2) * 0.33;
color[2] = (color[2] + 255*2) * 0.33;
}
for (let i = 0; i < rainbow.length; i++) {
const min_x = 500 + i* 75;
const min_y = 500 + i* 75;
const max_x = min_x + 200;
const max_y = min_y + 200;
drawSquare(min_x, min_y, max_x, max_y, rainbow[i]);
}
/* bind first rendertarget in blur swapchain */
{
gl.bindFramebuffer(gl.FRAMEBUFFER, render_targets[0].fb);
/* clear all */
gl.clearColor(0.0, 0.0, 0.0, 1.0);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
}
/* geo pass */
{
gl.useProgram(shaders.geo.program);
gl.enableVertexAttribArray(shaders.geo.a_pos);
gl.enableVertexAttribArray(shaders.geo.a_color);
gl.uniformMatrix4fv(shaders.geo.u_matrix, false, pMatrix);
/* upload/bind geometry */
let vbuf_count = 3;
{
gl.bindBuffer(gl.ARRAY_BUFFER, geo_vbuf_pos);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(geo_pos), gl.STATIC_DRAW);
gl.vertexAttribPointer(shaders.geo.a_pos, 3, gl.FLOAT, false, 0, 0);
gl.bindBuffer(gl.ARRAY_BUFFER, geo_vbuf_color);
gl.bufferData(gl.ARRAY_BUFFER, new Uint8Array(geo_color), gl.STATIC_DRAW);
gl.vertexAttribPointer(shaders.geo.a_color, 4, gl.UNSIGNED_BYTE, true, 0, 0);
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, geo_ibuf);
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint16Array(geo_idx), gl.STATIC_DRAW);
}
gl.drawElements(gl.TRIANGLES, geo_idx.length, gl.UNSIGNED_SHORT, 0);
}
const passes = [
[render_targets[1].fb, render_targets[0].tex, [0, 8]],
[render_targets[0].fb, render_targets[1].tex, [7, 0]],
[render_targets[1].fb, render_targets[0].tex, [0, 6]],
[render_targets[0].fb, render_targets[1].tex, [5, 0]],
[render_targets[1].fb, render_targets[0].tex, [0, 4]],
[render_targets[0].fb, render_targets[1].tex, [3, 0]],
[render_targets[1].fb, render_targets[0].tex, [0, 2]],
[ null, render_targets[1].tex, [1, 0]]
];
for (const [dst_fb, src_tex, dir] of passes) {
gl.bindFramebuffer(gl.FRAMEBUFFER, dst_fb);
gl.useProgram(shaders.fullscreenBlur.program);
gl.uniform2fv(shaders.fullscreenBlur.u_direction, dir);
/* bind tex */
{
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, src_tex);
gl.uniform1i(shaders.fullscreenBlur.u_texture, 0);
}
gl.drawArrays(gl.TRIANGLE_FAN, 0, 3);
}
}
})
</script>
</body>
</html>