Repository navigation
Expand file tree
/
Copy pathblobs.rs
More file actions
345 lines (284 loc) · 10.2 KB
/
Copy pathblobs.rs
File metadata and controls
345 lines (284 loc) · 10.2 KB
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
use miniquad::*;
#[repr(C)]
struct Vec2 {
x: f32,
y: f32,
}
#[repr(C)]
struct Vertex {
pos: Vec2,
uv: Vec2,
}
struct Stage {
pipeline: Pipeline,
bindings: Bindings,
start_time: f64,
last_frame: f64,
uniforms: shader::Uniforms,
blobs_velocities: [(f32, f32); 32],
ctx: Box<dyn RenderingBackend>,
}
impl Stage {
pub fn new() -> Stage {
let mut ctx: Box<dyn RenderingBackend> = window::new_rendering_backend();
#[rustfmt::skip]
let vertices: [Vertex; 4] = [
Vertex { pos : Vec2 { x: -1.0, y: -1.0 }, uv: Vec2 { x: 0., y: 0. } },
Vertex { pos : Vec2 { x: 1.0, y: -1.0 }, uv: Vec2 { x: 1., y: 0. } },
Vertex { pos : Vec2 { x: 1.0, y: 1.0 }, uv: Vec2 { x: 1., y: 1. } },
Vertex { pos : Vec2 { x: -1.0, y: 1.0 }, uv: Vec2 { x: 0., y: 1. } },
];
let vertex_buffer = ctx.new_buffer(
BufferType::VertexBuffer,
BufferUsage::Immutable,
BufferSource::slice(&vertices),
);
let indices: [u16; 6] = [0, 1, 2, 0, 2, 3];
let index_buffer = ctx.new_buffer(
BufferType::IndexBuffer,
BufferUsage::Immutable,
BufferSource::slice(&indices),
);
let bindings = Bindings {
vertex_buffers: vec![vertex_buffer],
index_buffer: index_buffer,
images: vec![],
};
let shader = ctx
.new_shader(
match ctx.info().backend {
Backend::OpenGl => ShaderSource::Glsl {
vertex: shader::VERTEX,
fragment: shader::FRAGMENT,
},
Backend::Metal => ShaderSource::Msl {
program: shader::METAL,
},
},
shader::meta(),
)
.unwrap();
let pipeline = ctx.new_pipeline(
&[BufferLayout::default()],
&[
VertexAttribute::new("in_pos", VertexFormat::Float2),
VertexAttribute::new("in_uv", VertexFormat::Float2),
],
shader,
PipelineParams::default()
);
let uniforms = shader::Uniforms {
time: 0.,
blobs_count: 1,
blobs_positions: [(0., 0.); 32],
};
let time = miniquad::date::now();
Stage {
pipeline,
bindings,
start_time: time,
uniforms,
blobs_velocities: [(0., 0.); 32],
last_frame: time,
ctx,
}
}
}
impl EventHandler for Stage {
fn update(&mut self) {
let time = miniquad::date::now();
let delta = (time - self.last_frame) as f32;
self.last_frame = time;
for i in 1..self.uniforms.blobs_count as usize {
self.uniforms.blobs_positions[i].0 += self.blobs_velocities[i].0 * delta * 0.1;
self.uniforms.blobs_positions[i].1 += self.blobs_velocities[i].1 * delta * 0.1;
if self.uniforms.blobs_positions[i].0 < 0. || self.uniforms.blobs_positions[i].0 > 1. {
self.blobs_velocities[i].0 *= -1.;
}
if self.uniforms.blobs_positions[i].1 < 0. || self.uniforms.blobs_positions[i].1 > 1. {
self.blobs_velocities[i].1 *= -1.;
}
}
}
fn mouse_motion_event(&mut self, x: f32, y: f32) {
let (w, h) = window::screen_size();
let (x, y) = (x / w, 1. - y / h);
self.uniforms.blobs_positions[0] = (x, y);
}
fn mouse_button_down_event(&mut self, _button: MouseButton, x: f32, y: f32) {
if self.uniforms.blobs_count >= 32 {
return;
}
let (w, h) = window::screen_size();
let (x, y) = (x / w, 1. - y / h);
let (dx, dy) = (quad_rand::gen_range(-1., 1.), quad_rand::gen_range(-1., 1.));
self.uniforms.blobs_positions[self.uniforms.blobs_count as usize] = (x, y);
self.blobs_velocities[self.uniforms.blobs_count as usize] = (dx, dy);
self.uniforms.blobs_count += 1;
}
fn draw(&mut self) {
self.uniforms.time = (miniquad::date::now() - self.start_time) as f32;
self.ctx.begin_default_pass(Default::default());
self.ctx.apply_pipeline(&self.pipeline);
self.ctx.apply_bindings(&self.bindings);
self.ctx
.apply_uniforms(UniformsSource::table(&self.uniforms));
self.ctx.draw(0, 6, 1);
self.ctx.end_render_pass();
self.ctx.commit_frame();
}
}
fn main() {
let mut conf = conf::Conf::default();
let metal = std::env::args().nth(1).as_deref() == Some("metal");
conf.platform.apple_gfx_api = if metal {
conf::AppleGfxApi::Metal
} else {
conf::AppleGfxApi::OpenGl
};
miniquad::start(conf, move || Box::new(Stage::new()));
}
// based on: https://www.shadertoy.com/view/XsS3DV
mod shader {
use miniquad::*;
pub const VERTEX: &str = r#"#version 100
attribute vec2 in_pos;
attribute vec2 in_uv;
varying highp vec2 uv;
void main() {
gl_Position = vec4(in_pos, 0, 1);
uv = in_uv;
}"#;
pub const FRAGMENT: &str = r#"#version 100
precision highp float;
varying vec2 uv;
uniform float time;
uniform int blobs_count;
uniform vec2 blobs_positions[32];
float k = 20.0;
float field = 0.0;
vec2 coord;
void circle ( float r , vec3 col , vec2 offset) {
vec2 pos = coord.xy;
vec2 c = offset;
float d = distance ( pos , c );
field += ( k * r ) / ( d*d );
}
vec3 band ( float shade, float low, float high, vec3 col1, vec3 col2 ) {
if ( (shade >= low) && (shade <= high) ) {
float delta = (shade - low) / (high - low);
vec3 colDiff = col2 - col1;
return col1 + (delta * colDiff);
}
else
return vec3(0.0,0.0,0.0);
}
vec3 gradient ( float shade ) {
vec3 colour = vec3( (sin(time/2.0)*0.25)+0.25,0.0,(cos(time/2.0)*0.25)+0.25);
vec3 col1 = vec3(0.01, 0.0, 1.0-0.01);
vec3 col2 = vec3(1.0-0.01, 0.0, 0.01);
vec3 col3 = vec3(0.02, 1.0-0.02, 0.02);
vec3 col4 = vec3((0.01+0.02)/2.0, (0.01+0.02)/2.0, 1.0 - (0.01+0.02)/2.0);
vec3 col5 = vec3(0.02, 0.02, 0.02);
colour += band ( shade, 0.0, 0.3, colour, col1 );
colour += band ( shade, 0.3, 0.6, col1, col2 );
colour += band ( shade, 0.6, 0.8, col2, col3 );
colour += band ( shade, 0.8, 0.9, col3, col4 );
colour += band ( shade, 0.9, 1.0, col4, col5 );
return colour;
}
void main() {
coord = uv;
for (int i = 0; i < 32; i++) {
if (i >= blobs_count) { break; } // workaround for webgl error: Loop index cannot be compared with non-constant expression
circle(.03 , vec3(0.7 ,0.2, 0.8), blobs_positions[i]);
}
float shade = min ( 1.0, max ( field/256.0, 0.0 ) );
gl_FragColor = vec4( gradient(shade), 1.0 );
}"#;
pub const METAL: &str = r#"
#include <metal_stdlib>
using namespace metal;
struct Uniforms
{
float time;
int16_t blobs_count;
float2 blobs[32];
};
struct Vertex
{
float2 in_pos [[attribute(0)]];
float2 in_uv [[attribute(1)]];
};
struct RasterizerData
{
float4 position [[position]];
float2 uv [[user(locn0)]];
};
vertex RasterizerData vertexShader(
Vertex v [[stage_in]])
{
RasterizerData out;
out.position = float4(v.in_pos.xy, 0.0, 1.0);
out.uv = v.in_uv;
return out;
}
constant float k = 20.0;
float circle(float2 coord, float r , float3 col , float2 offset) {
float2 pos = coord.xy;
float2 c = offset;
float d = distance ( pos , c );
return ( k * r ) / ( d*d );
}
float3 band ( float shade, float low, float high, float3 col1, float3 col2 ) {
if ( (shade >= low) && (shade <= high) ) {
float delta = (shade - low) / (high - low);
float3 colDiff = col2 - col1;
return col1 + (delta * colDiff);
}
else
return float3(0.0,0.0,0.0);
}
float3 gradient (float shade, float time) {
float3 colour = float3( (sin(time/2.0)*0.25)+0.25,0.0,(cos(time/2.0)*0.25)+0.25);
float3 col1 = float3(0.01, 0.0, 1.0-0.01);
float3 col2 = float3(1.0-0.01, 0.0, 0.01);
float3 col3 = float3(0.02, 1.0-0.02, 0.02);
float3 col4 = float3((0.01+0.02)/2.0, (0.01+0.02)/2.0, 1.0 - (0.01+0.02)/2.0);
float3 col5 = float3(0.02, 0.02, 0.02);
colour += band ( shade, 0.0, 0.3, colour, col1 );
colour += band ( shade, 0.3, 0.6, col1, col2 );
colour += band ( shade, 0.6, 0.8, col2, col3 );
colour += band ( shade, 0.8, 0.9, col3, col4 );
colour += band ( shade, 0.9, 1.0, col4, col5 );
return colour;
}
fragment float4 fragmentShader(RasterizerData in [[stage_in]], constant Uniforms& uniforms [[buffer(0)]])
{
float field = 0.0;
for (int i = 0; i < 32; i++) {
if (i >= uniforms.blobs_count) { break; } // workaround for webgl error: Loop index cannot be compared with non-constant expression
field += circle(in.uv, .03 , float3(0.7 ,0.2, 0.8), uniforms.blobs[i]);
}
float shade = min ( 1.0, max(field/256.0, 0.0 ) );
return float4(gradient(shade, uniforms.time), 1.0 );
}"#;
pub fn meta() -> ShaderMeta {
ShaderMeta {
images: vec![],
uniforms: UniformBlockLayout {
uniforms: vec![
UniformDesc::new("time", UniformType::Float1),
UniformDesc::new("blobs_count", UniformType::Int1),
UniformDesc::new("blobs_positions", UniformType::Float2).array(32),
],
},
}
}
#[repr(C)]
pub struct Uniforms {
pub time: f32,
pub blobs_count: i32,
pub blobs_positions: [(f32, f32); 32],
}
}