gizmo-renderer 0.1.5

A custom ECS and physics engine aimed for realistic simulations.
Documentation 
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

// ============================================================
// Yelbegen Engine — Post-Processing Shader
// Bloom (Bright Extract + Gaussian Blur) ve ACES Tone Mapping + Sinematikler


struct FullscreenVertexOutput {
    @builtin(position) position: vec4<f32>,
    @location(0) uv: vec2<f32>,
};

@vertex
fn vs_fullscreen(@builtin(vertex_index) vertex_index: u32) -> FullscreenVertexOutput {
    var out: FullscreenVertexOutput;
    let x = f32(i32(vertex_index) / 2) * 4.0 - 1.0;
    let y = f32(i32(vertex_index) % 2) * 4.0 - 1.0;
    out.position = vec4<f32>(x, y, 0.0, 1.0);
    out.uv = vec2<f32>((x + 1.0) * 0.5, (1.0 - y) * 0.5);
    return out;
}

@group(0) @binding(0) var t_source: texture_2d<f32>;
@group(0) @binding(1) var s_source: sampler;

struct PostProcessParams {
    bloom_intensity: f32,
    bloom_threshold: f32,
    exposure: f32,
    chromatic_aberration: f32,
    vignette_intensity: f32,
    film_grain_intensity: f32,
    dof_focus_dist: f32,
    dof_focus_range: f32,
    dof_blur_size: f32,
    _padding0: f32,
    _padding1: f32,
    _padding2: f32,
};

@group(2) @binding(0)
var<uniform> params: PostProcessParams;

// ============================
// Pass 1: Bright Extract
// ============================
@fragment
fn fs_bright_extract(in: FullscreenVertexOutput) -> @location(0) vec4<f32> {
    let color = textureSample(t_source, s_source, in.uv);
    let luminance = dot(color.rgb, vec3<f32>(0.2126, 0.7152, 0.0722));
    
    let threshold = params.bloom_threshold;
    let soft_threshold = threshold * 0.7; // Yumuşatılmış alt sınır
    let knee = max(luminance - soft_threshold, 0.0) / (threshold - soft_threshold + 0.0001);
    let contribution = clamp(knee * knee, 0.0, 1.0);
    
    return vec4<f32>(color.rgb * contribution, 1.0);
}

// ============================
// Pass 2: Gaussian Blur
// ============================
struct BlurParams {
    direction: vec2<f32>,
    _padding: vec2<f32>,
};

@group(1) @binding(0) var<uniform> blur_params: BlurParams;

@fragment
fn fs_blur(in: FullscreenVertexOutput) -> @location(0) vec4<f32> {
    var result = textureSample(t_source, s_source, in.uv) * 0.227027;
    
    let o1 = blur_params.direction * 1.0;
    result += textureSample(t_source, s_source, in.uv + o1) * 0.1945946;
    result += textureSample(t_source, s_source, in.uv - o1) * 0.1945946;
    
    let o2 = blur_params.direction * 2.0;
    result += textureSample(t_source, s_source, in.uv + o2) * 0.1216216;
    result += textureSample(t_source, s_source, in.uv - o2) * 0.1216216;
    
    let o3 = blur_params.direction * 3.0;
    result += textureSample(t_source, s_source, in.uv + o3) * 0.054054;
    result += textureSample(t_source, s_source, in.uv - o3) * 0.054054;
    
    let o4 = blur_params.direction * 4.0;
    result += textureSample(t_source, s_source, in.uv + o4) * 0.016216;
    result += textureSample(t_source, s_source, in.uv - o4) * 0.016216;
    
    return vec4<f32>(result.rgb, 1.0);
}

// ============================
// Pass 3: Composite + Tone Mapping
// ============================
@group(1) @binding(0) var t_bloom: texture_2d<f32>;
@group(1) @binding(1) var s_bloom: sampler;
@group(1) @binding(2) var t_depth: texture_depth_2d;

fn aces_tonemap(x: vec3<f32>) -> vec3<f32> {
    let a = 2.51;
    let b = 0.03;
    let c = 2.43;
    let d = 0.59;
    let e = 0.14;
    return clamp((x * (a * x + b)) / (x * (c * x + d) + e), vec3<f32>(0.0), vec3<f32>(1.0));
}

@fragment
fn fs_composite(in: FullscreenVertexOutput) -> @location(0) vec4<f32> {
    // 1. Chromatic Aberration
    let center_dist = distance(in.uv, vec2<f32>(0.5, 0.5));
    let ca_offset = params.chromatic_aberration * center_dist * 0.05;
    
    let r = textureSample(t_source, s_source, in.uv + vec2<f32>(ca_offset, 0.0)).r;
    let g = textureSample(t_source, s_source, in.uv).g;
    let b = textureSample(t_source, s_source, in.uv - vec2<f32>(ca_offset, 0.0)).b;
    let hdr_color = vec3<f32>(r, g, b);

    // 2. Depth of Field (DoF)
    let depth_dims = textureDimensions(t_depth, 0);
    let depth_uv = vec2<i32>(i32(in.uv.x * f32(depth_dims.x)), i32(in.uv.y * f32(depth_dims.y)));
    let depth_val = textureLoad(t_depth, depth_uv, 0);
    // Linearize depth (assuming perspective projection, near=0.1, far=1000.0)
    let n = 0.1;
    let f = 1000.0;
    let linear_depth = (2.0 * n) / (f + n - depth_val * (f - n));
    let view_dist = linear_depth * f;
    
    let coc = clamp(abs(view_dist - params.dof_focus_dist) / params.dof_focus_range, 0.0, 1.0);
    
    var dof_color = hdr_color;
    if (coc > 0.01 && params.dof_blur_size > 0.0) {
        var blurred = vec3<f32>(0.0);
        var total_weight = 0.0;
        let radius = coc * params.dof_blur_size;
        
        // Simple Poisson-like disk samples
        
        let aspect = vec2<f32>(1.0, 1.0); // Aspect correction might be needed for perfect circles
        let step_size = vec2<f32>(1.0 / 1920.0, 1.0 / 1080.0) * radius;
        
        // Unrolled Poisson disk
        blurred += textureSampleLevel(t_source, s_source, in.uv + vec2<f32>( 0.000,  1.000) * step_size, 0.0).rgb;
        blurred += textureSampleLevel(t_source, s_source, in.uv + vec2<f32>( 0.866,  0.500) * step_size, 0.0).rgb;
        blurred += textureSampleLevel(t_source, s_source, in.uv + vec2<f32>( 0.866, -0.500) * step_size, 0.0).rgb;
        blurred += textureSampleLevel(t_source, s_source, in.uv + vec2<f32>( 0.000, -1.000) * step_size, 0.0).rgb;
        blurred += textureSampleLevel(t_source, s_source, in.uv + vec2<f32>(-0.866, -0.500) * step_size, 0.0).rgb;
        blurred += textureSampleLevel(t_source, s_source, in.uv + vec2<f32>(-0.866,  0.500) * step_size, 0.0).rgb;
        blurred += textureSampleLevel(t_source, s_source, in.uv + vec2<f32>( 0.433,  0.750) * step_size, 0.0).rgb;
        blurred += textureSampleLevel(t_source, s_source, in.uv + vec2<f32>(-0.433, -0.750) * step_size, 0.0).rgb;
        
        total_weight = 8.0;
        blurred = blurred / total_weight;
        dof_color = mix(hdr_color, blurred, coc);
    }

    // 3. Bloom Addition
    let bloom_color = textureSample(t_bloom, s_bloom, in.uv).rgb;
    let combined = (dof_color + bloom_color * params.bloom_intensity) * params.exposure;
    
    // 3. ACES Tone Mapping
    let mapped = aces_tonemap(combined);
    
    // Swapchain is configured as an sRGB format (Bgra8UnormSrgb/Rgba8UnormSrgb)
    // Hardware automatically applies gamma correction upon writing.
    var final_color = mapped;
    
    // 5. Vignette
    let vignette = smoothstep(1.5, 0.3, center_dist * (1.0 + params.vignette_intensity));
    final_color *= vignette;
    
    // 6. Film Grain
    let noise = fract(sin(dot(in.uv, vec2<f32>(12.9898, 78.233))) * 43758.5453) - 0.5;
    final_color += final_color * noise * params.film_grain_intensity;
    
    return vec4<f32>(final_color, 1.0);
}