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
|
# SDF Effect Guide
Streamlined workflow for SDF raymarching effects using the `SDFEffect` base class.
---
## Quick Start
```cpp
// src/effects/my_sdf_effect.h
class MySDFEffect : public SDFEffect {
MySDFEffect(const GpuContext& ctx);
void render(WGPURenderPassEncoder pass,
const CommonPostProcessUniforms& uniforms) override;
RenderPass pass_;
};
```
```cpp
// src/effects/my_sdf_effect.cc
#include "effects/my_sdf_effect.h"
#include "gpu/gpu.h"
#include "gpu/shaders.h"
MySDFEffect::MySDFEffect(const GpuContext& ctx) : SDFEffect(ctx) {
ResourceBinding bindings[] = {
{uniforms_.get(), WGPUBufferBindingType_Uniform},
{camera_params_.get(), WGPUBufferBindingType_Uniform}};
pass_ = gpu_create_render_pass(ctx_.device, ctx_.format,
my_sdf_shader_wgsl, bindings, 2);
pass_.vertex_count = 3;
}
void MySDFEffect::render(WGPURenderPassEncoder pass,
const CommonPostProcessUniforms& uniforms) {
uniforms_.update(ctx_.queue, uniforms);
// Orbiting camera
vec3 cam_pos(std::cos(uniforms.time * 0.5f) * 5.0f, 2.0f,
std::sin(uniforms.time * 0.5f) * 5.0f);
update_camera(cam_pos, vec3(0, 0, 0), vec3(0, 1, 0), 0.785398f, 0.1f, 100.0f,
uniforms.aspect_ratio);
wgpuRenderPassEncoderSetPipeline(pass, pass_.pipeline);
wgpuRenderPassEncoderSetBindGroup(pass, 0, pass_.bind_group, 0, nullptr);
wgpuRenderPassEncoderDraw(pass, pass_.vertex_count, 1, 0, 0);
}
```
```wgsl
// workspaces/main/shaders/my_sdf.wgsl
#include "common_uniforms"
#include "camera_common"
#include "math/sdf_shapes"
#include "render/raymarching"
@group(0) @binding(0) var<uniform> uniforms: CommonUniforms;
@group(0) @binding(1) var<uniform> camera: CameraParams;
fn df(p: vec3<f32>) -> f32 {
return sdSphere(p, 1.0);
}
@vertex
fn vs_main(@builtin(vertex_index) vid: u32) -> @builtin(position) vec4<f32> {
let x = f32((vid & 1u) << 2u) - 1.0;
let y = f32((vid & 2u) << 1u) - 1.0;
return vec4<f32>(x, y, 0.0, 1.0);
}
@fragment
fn fs_main(@builtin(position) pos: vec4<f32>) -> @location(0) vec4<f32> {
let uv = (pos.xy / uniforms.resolution - 0.5) * 2.0;
let ray = getCameraRay(camera, uv);
let t = rayMarch(ray.origin, ray.direction, 0.0);
var col = vec3<f32>(0.1);
if (t < MAX_RAY_LENGTH) {
let hit_pos = ray.origin + ray.direction * t;
let n = normal(hit_pos);
col = vec3<f32>(n * 0.5 + 0.5);
}
return vec4<f32>(col, 1.0);
}
```
---
## Available Uniforms
### CommonUniforms (binding 0)
- `resolution`: vec2 (screen size)
- `time`: float (physical seconds)
- `beat_time`: float (musical beats)
- `beat_phase`: float (0-1 within beat)
- `audio_intensity`: float (peak)
- `aspect_ratio`: float
### CameraParams (binding 1)
- `inv_view`: mat4x4 (inverse view matrix)
- `fov`: float (vertical FOV in radians)
- `near_plane`, `far_plane`: float
- `aspect_ratio`: float
---
## WGSL Helpers
From `camera_common.wgsl`:
```wgsl
fn getCameraRay(cam: CameraParams, uv: vec2<f32>) -> Ray;
fn getCameraPosition(cam: CameraParams) -> vec3<f32>;
fn getCameraForward(cam: CameraParams) -> vec3<f32>;
fn getCameraUp(cam: CameraParams) -> vec3<f32>;
fn getCameraRight(cam: CameraParams) -> vec3<f32>;
```
From `render/raymarching.wgsl`:
```wgsl
fn rayMarch(ro: vec3<f32>, rd: vec3<f32>, initt: f32) -> f32;
fn normal(pos: vec3<f32>) -> vec3<f32>;
fn shadow(lp: vec3<f32>, ld: vec3<f32>, mint: f32, maxt: f32) -> f32;
```
From `math/sdf_shapes.wgsl`:
```wgsl
fn sdSphere(p: vec3<f32>, r: float) -> f32;
fn sdBox(p: vec3<f32>, b: vec3<f32>) -> f32;
fn sdTorus(p: vec3<f32>, t: vec2<f32>) -> f32;
fn sdPlane(p: vec3<f32>, n: vec3<f32>, h: f32) -> f32;
```
---
## Camera Control
```cpp
// Method 1: Manual values
update_camera(position, target, up, fov, near, far, aspect);
// Method 2: Camera object
Camera cam;
cam.position = vec3(0, 5, 10);
cam.target = vec3(0, 0, 0);
update_camera(cam, uniforms.aspect_ratio);
```
---
## Registration Checklist
1. Add shader to `workspaces/main/assets.txt`
2. Add extern declaration to `src/gpu/shaders.h`
3. Add definition to `src/gpu/shaders.cc`
4. Add `.cc` to `cmake/DemoSourceLists.cmake` (both headless & normal)
5. Include header in `src/gpu/demo_effects.h`
6. Add to `src/tests/gpu/test_demo_effects.cc`
---
## Example: workspaces/main/shaders/sdf_test.wgsl
|
