// This file is part of the 64k demo project.
// It implements the concrete effects used in the demo.

#include "gpu/demo_effects.h"
#include "gpu/gpu.h"
#include <cmath>
#include <cstdlib>
#include <cstring>
#include <vector>

// Helper to create a standard post-processing pipeline
static WGPURenderPipeline
create_post_process_pipeline(WGPUDevice device, WGPUTextureFormat format,
                             const char *shader_code) {
  WGPUShaderModuleDescriptor shader_desc = {};
  WGPUShaderSourceWGSL wgsl_src = {};
  wgsl_src.chain.sType = WGPUSType_ShaderSourceWGSL;
  wgsl_src.code = str_view(shader_code);
  shader_desc.nextInChain = &wgsl_src.chain;
  WGPUShaderModule shader_module =
      wgpuDeviceCreateShaderModule(device, &shader_desc);

  WGPUBindGroupLayoutEntry bgl_entries[3] = {};
  bgl_entries[0].binding = 0;
  bgl_entries[0].visibility = WGPUShaderStage_Fragment;
  bgl_entries[0].sampler.type = WGPUSamplerBindingType_Filtering;
  bgl_entries[1].binding = 1;
  bgl_entries[1].visibility = WGPUShaderStage_Fragment;
  bgl_entries[1].texture.sampleType = WGPUTextureSampleType_Float;
  bgl_entries[1].texture.viewDimension = WGPUTextureViewDimension_2D;
  bgl_entries[2].binding = 2;
  bgl_entries[2].visibility = WGPUShaderStage_Fragment;
  bgl_entries[2].buffer.type = WGPUBufferBindingType_Uniform;

  WGPUBindGroupLayoutDescriptor bgl_desc = {};
  bgl_desc.entryCount = 3;
  bgl_desc.entries = bgl_entries;
  WGPUBindGroupLayout bgl = wgpuDeviceCreateBindGroupLayout(device, &bgl_desc);

  WGPUPipelineLayoutDescriptor pl_desc = {};
  pl_desc.bindGroupLayoutCount = 1;
  pl_desc.bindGroupLayouts = &bgl;
  WGPUPipelineLayout pl = wgpuDeviceCreatePipelineLayout(device, &pl_desc);

  WGPUColorTargetState color_target = {};
  color_target.format = format;
  color_target.writeMask = WGPUColorWriteMask_All;

  WGPUFragmentState fragment_state = {};
  fragment_state.module = shader_module;
  fragment_state.entryPoint = str_view("fs_main");
  fragment_state.targetCount = 1;
  fragment_state.targets = &color_target;

  WGPURenderPipelineDescriptor pipeline_desc = {};
  pipeline_desc.layout = pl;
  pipeline_desc.vertex.module = shader_module;
  pipeline_desc.vertex.entryPoint = str_view("vs_main");
  pipeline_desc.fragment = &fragment_state;
  pipeline_desc.primitive.topology = WGPUPrimitiveTopology_TriangleList;
  pipeline_desc.multisample.count = 1;
  pipeline_desc.multisample.mask = 0xFFFFFFFF;

  return wgpuDeviceCreateRenderPipeline(device, &pipeline_desc);
}

// --- SHADERS ---

const char *main_shader_wgsl = R"(
struct Uniforms { audio_peak: f32, aspect_ratio: f32, time: f32, };
@group(0) @binding(0) var<uniform> uniforms: Uniforms;
@vertex fn vs_main(@builtin(vertex_index) i: u32) -> @builtin(position) vec4<f32> {
    let PI = 3.14159265; let num_sides = 7.0;
    let scale = 0.5 + 0.3 * uniforms.audio_peak;
    let tri_idx = f32(i/3u); let sub_idx = i%3u;
    if (sub_idx == 0u) { return vec4<f32>(0.0,0.0,0.0,1.0); }
    let angle = (tri_idx + f32(sub_idx - 1u)) * 2.0 * PI / num_sides + uniforms.time * 0.5;
    return vec4<f32>(scale*cos(angle)/uniforms.aspect_ratio, scale*sin(angle), 0.0, 1.0);
}
@fragment fn fs_main() -> @location(0) vec4<f32> {
    let h = uniforms.time * 2.0 + uniforms.audio_peak * 3.0;
    let r = sin(h)*0.5+0.5; let g = sin(h+2.0)*0.9+0.3; let b = sin(h+4.0)*0.5+0.5;
    let boost = uniforms.audio_peak * 0.5;
    return vec4<f32>(r+boost,g+boost,b+boost, 1.0);
})";

const char *particle_compute_wgsl = R"(
struct Particle { pos: vec4<f32>, vel: vec4<f32>, rot: vec4<f32>, color: vec4<f32>, };
struct Uniforms { audio_peak: f32, aspect_ratio: f32, time: f32, beat: f32, };
@group(0) @binding(0) var<storage, read_write> particles: array<Particle>;
@group(0) @binding(1) var<uniform> uniforms: Uniforms;
@compute @workgroup_size(64)
fn main(@builtin(global_invocation_id) id: vec3<u32>) {
    let i = id.x; if (i >= arrayLength(&particles)) { return; }
    var p = particles[i];
    let new_pos = p.pos.xyz + p.vel.xyz * 0.016;
    p.pos = vec4<f32>(new_pos, p.pos.w);
    p.vel.y = p.vel.y - 0.01 * (1.0 + uniforms.audio_peak * 5.0);
    p.rot.x = p.rot.x + p.rot.y * 0.016;
    if (p.pos.y < -1.5) {
        p.pos.y = 1.5;
        p.pos.x = (f32(i % 100u) / 50.0) - 1.0 + (uniforms.audio_peak * 0.5);
        p.vel.y = 0.0;
    }
    particles[i] = p;
})";

const char *particle_render_wgsl = R"(
struct Particle { pos: vec4<f32>, vel: vec4<f32>, rot: vec4<f32>, color: vec4<f32>, };
struct Uniforms { audio_peak: f32, aspect_ratio: f32, time: f32, beat: f32, };
@group(0) @binding(0) var<storage, read> particles: array<Particle>;
@group(0) @binding(1) var<uniform> uniforms: Uniforms;
struct VSOut { @builtin(position) pos: vec4<f32>, @location(0) color: vec4<f32>, };
@vertex fn vs_main(@builtin(vertex_index) vi: u32, @builtin(instance_index) ii: u32) -> VSOut {
    let p = particles[ii];
    let size = 0.02 + p.pos.z * 0.01 + uniforms.audio_peak * 0.02;
    var offsets = array<vec2<f32>, 6>(vec2<f32>(-1,-1), vec2<f32>(1,-1), vec2<f32>(-1,1), vec2<f32>(-1,1), vec2<f32>(1,-1), vec2<f32>(1,1));
    let offset = offsets[vi];
    let c = cos(p.rot.x); let s = sin(p.rot.x);
    let rotated_offset = vec2<f32>(offset.x*c-offset.y*s, offset.x*s+offset.y*c);
    let pos = vec2<f32>(p.pos.x + rotated_offset.x*size/uniforms.aspect_ratio, p.pos.y + rotated_offset.y*size);
    return VSOut(vec4<f32>(pos, 0.0, 1.0), p.color * (0.5 + 0.5 * uniforms.audio_peak));
}
@fragment fn fs_main(@location(0) color: vec4<f32>) -> @location(0) vec4<f32> { return color; }
)";

const char *passthrough_shader_wgsl = R"(
@group(0) @binding(0) var smplr: sampler;
@group(0) @binding(1) var txt: texture_2d<f32>;
@vertex fn vs_main(@builtin(vertex_index) i: u32) -> @builtin(position) vec4<f32> {
    var pos = array<vec2<f32>, 3>(vec2<f32>(-1,-1), vec2<f32>(3,-1), vec2<f32>(-1, 3));
    return vec4<f32>(pos[i], 0.0, 1.0);
}
@fragment fn fs_main(@builtin(position) p: vec4<f32>) -> @location(0) vec4<f32> {
    return textureSample(txt, smplr, p.xy / vec2<f32>(1280.0, 720.0));
})";

const char *ellipse_shader_wgsl = R"(
struct Uniforms { time: f32, beat: f32, intensity: f32, aspect_ratio: f32, };
@group(0) @binding(0) var<uniform> uniforms: Uniforms;
@vertex fn vs_main(@builtin(vertex_index) i: u32) -> @builtin(position) vec4<f32> {
    var pos = array<vec2<f32>, 3>(vec2<f32>(-1.0, -1.0), vec2<f32>( 3.0, -1.0), vec2<f32>(-1.0,  3.0));
    return vec4<f32>(pos[i], 0.0, 1.0);
}
fn sdEllipse(p: vec2<f32>, ab: vec2<f32>) -> f32 {
    var p_abs = abs(p); if (p_abs.x > p_abs.y) { p_abs = vec2<f32>(p_abs.y, p_abs.x); }
    let l = ab.y*ab.y - ab.x*ab.x; let m = ab.x*p_abs.x/l; let n = ab.y*p_abs.y/l;
    let m2 = m*m; let n2 = n*n; let c = (m2+n2-1.0)/3.0; let c3 = c*c*c;
    let d = c3 + m2*n2; let g = m + m*n2; var co: f32;
    if (d < 0.0) { let h = acos((c3 + m2*n2*2.0)/c3)/3.0; let s = cos(h); let t = sin(h)*sqrt(3.0); co = (sqrt(-c*(s+t*2.0)+m2) + sign(l)*sqrt(-c*(s-t*2.0)+m2) + abs(g)/(sqrt(-c*(s+t*2.0)+m2)*sqrt(-c*(s-t*2.0)+m2)) - m) / 2.0; }
    else { let h = 2.0*m*n*sqrt(d); let s = sign(c3+m2*n2+h)*pow(abs(c3+m2*n2+h), 1.0/3.0); let u = sign(c3+m2*n2-h)*pow(abs(c3+m2*n2-h), 1.0/3.0); let rx = -s-u + m2*2.0; let ry = (s-u)*sqrt(3.0); co = (ry/sqrt(sqrt(rx*rx+ry*ry)-rx) + 2.0*g/sqrt(rx*rx+ry*ry) - m) / 2.0; }
    let si = sqrt(max(0.0, 1.0-co*co)); return length(p_abs-vec2<f32>(ab.x*co, ab.y*si)) * sign(p_abs.y*ab.x*co-p_abs.x*ab.y*si);
}
@fragment fn fs_main(@builtin(position) p: vec4<f32>) -> @location(0) vec4<f32> {
    let uv = (p.xy / vec2<f32>(1280.0, 720.0) - 0.5) * 2.0;
    let movement = vec2<f32>(sin(uniforms.time*0.7), cos(uniforms.time*0.5));
    let d = sdEllipse((uv * vec2<f32>(uniforms.aspect_ratio, 1.0)) - movement, vec2<f32>(0.5, 0.3) * (1.0 + uniforms.beat*0.2));
    return mix(vec4<f32>(0.2, 0.8, 0.4, 1.0), vec4<f32>(0.0), smoothstep(0.0, 0.01, d));
})";

const char *particle_spray_compute_wgsl = R"(
struct Particle { pos: vec4<f32>, vel: vec4<f32>, rot: vec4<f32>, color: vec4<f32>, };
struct Uniforms { intensity: f32, aspect_ratio: f32, time: f32, beat: f32, };
@group(0) @binding(0) var<storage, read_write> particles: array<Particle>;
@group(0) @binding(1) var<uniform> uniforms: Uniforms;
fn hash(p: f32) -> f32 { return fract(sin(p)*43758.5453); }
@compute @workgroup_size(64)
fn main(@builtin(global_invocation_id) id: vec3<u32>) {
    let i = id.x; if (i >= arrayLength(&particles)) { return; }
    var p = particles[i];
    if (p.pos.w <= 0.0) {
        let r = hash(f32(i) + uniforms.time); let angle = r * 6.28318;
        p.pos = vec4<f32>(0.0, 0.0, 0.0, 1.0);
        p.vel = vec4<f32>(cos(angle), sin(angle), 0.0, 0.0) * (0.5 + hash(r)*0.5) * (1.0 + uniforms.intensity * 2.0);
        p.color = vec4<f32>(hash(r+0.1), hash(r+0.2), 1.0, 1.0);
    }
    let new_pos = p.pos.xyz + p.vel.xyz * 0.016;
    p.pos = vec4<f32>(new_pos, p.pos.w - 0.01 * (1.0 + uniforms.beat));
    p.vel.y = p.vel.y - 0.01;
    particles[i] = p;
})";

const char *gaussian_blur_shader_wgsl = R"(
@group(0) @binding(0) var smplr: sampler; @group(0) @binding(1) var txt: texture_2d<f32>;
struct Uniforms { time: f32, beat: f32, intensity: f32, aspect_ratio: f32, };
@group(0) @binding(2) var<uniform> uniforms: Uniforms;
@vertex fn vs_main(@builtin(vertex_index) i: u32) -> @builtin(position) vec4<f32> {
    var pos = array<vec2<f32>, 3>(vec2<f32>(-1,-1), vec2<f32>(3,-1), vec2<f32>(-1, 3));
    return vec4<f32>(pos[i], 0.0, 1.0);
}
@fragment fn fs_main(@builtin(position) p: vec4<f32>) -> @location(0) vec4<f32> {
    let uv = p.xy / vec2<f32>(1280.0, 720.0); var res = vec4<f32>(0.0);
    let size = 5.0 * uniforms.intensity;
    for(var x: f32 = -2.0; x <= 2.0; x += 1.0) {
        for(var y: f32 = -2.0; y <= 2.0; y += 1.0) {
            res += textureSample(txt, smplr, uv + vec2<f32>(x, y) * size / 1280.0);
        }
    }
    return res / 25.0;
})";

const char *solarize_shader_wgsl = R"(
@group(0) @binding(0) var smplr: sampler; @group(0) @binding(1) var txt: texture_2d<f32>;
struct Uniforms { time: f32, beat: f32, intensity: f32, aspect_ratio: f32, };
@group(0) @binding(2) var<uniform> uniforms: Uniforms;
@vertex fn vs_main(@builtin(vertex_index) i: u32) -> @builtin(position) vec4<f32> {
    var pos = array<vec2<f32>, 3>(vec2<f32>(-1,-1), vec2<f32>(3,-1), vec2<f32>(-1, 3));
    return vec4<f32>(pos[i], 0.0, 1.0);
}
@fragment fn fs_main(@builtin(position) p: vec4<f32>) -> @location(0) vec4<f32> {
    let uv = p.xy / vec2<f32>(1280.0, 720.0); var col = textureSample(txt, smplr, uv);
    let thr = 0.5 + 0.3 * sin(uniforms.time);
    if(col.r < thr) { col.r = 1.0 - col.r; }
    if(col.g < thr) { col.g = 1.0 - col.g; }
    if(col.b < thr) { col.b = 1.0 - col.b; }
    return col;
})";

const char *distort_shader_wgsl = R"(
@group(0) @binding(0) var smplr: sampler; @group(0) @binding(1) var txt: texture_2d<f32>;
struct Uniforms { time: f32, beat: f32, intensity: f32, aspect_ratio: f32, };
@group(0) @binding(2) var<uniform> uniforms: Uniforms;
@vertex fn vs_main(@builtin(vertex_index) i: u32) -> @builtin(position) vec4<f32> {
    var pos = array<vec2<f32>, 3>(vec2<f32>(-1,-1), vec2<f32>(3,-1), vec2<f32>(-1, 3));
    return vec4<f32>(pos[i], 0.0, 1.0);
}
@fragment fn fs_main(@builtin(position) p: vec4<f32>) -> @location(0) vec4<f32> {
    let uv = p.xy / vec2<f32>(1280.0, 720.0);
    let dist = 0.1 * uniforms.intensity * sin(uv.y * 20.0 + uniforms.time * 5.0);
    return textureSample(txt, smplr, uv + vec2<f32>(dist, 0.0));
})";

const char *chroma_aberration_shader_wgsl = R"(
@group(0) @binding(0) var smplr: sampler; @group(0) @binding(1) var txt: texture_2d<f32>;
struct Uniforms { time: f32, beat: f32, intensity: f32, aspect_ratio: f32, };
@group(0) @binding(2) var<uniform> uniforms: Uniforms;
@vertex fn vs_main(@builtin(vertex_index) i: u32) -> @builtin(position) vec4<f32> {
    var pos = array<vec2<f32>, 3>(vec2<f32>(-1,-1), vec2<f32>(3,-1), vec2<f32>(-1, 3));
    return vec4<f32>(pos[i], 0.0, 1.0);
}
@fragment fn fs_main(@builtin(position) p: vec4<f32>) -> @location(0) vec4<f32> {
    let uv = p.xy / vec2<f32>(1280.0, 720.0);
    let off = 0.02 * uniforms.intensity;
    let r = textureSample(txt, smplr, uv + vec2<f32>(off, 0.0)).r;
    let g = textureSample(txt, smplr, uv).g;
    let b = textureSample(txt, smplr, uv - vec2<f32>(off, 0.0)).b;
    return vec4<f32>(r, g, b, 1.0);
})";

// --- HeptagonEffect ---
HeptagonEffect::HeptagonEffect(WGPUDevice device, WGPUQueue queue,
                               WGPUTextureFormat format)
    : queue_(queue) {
  uniforms_ =
      gpu_create_buffer(device, sizeof(float) * 4,
                        WGPUBufferUsage_Uniform | WGPUBufferUsage_CopyDst);
  ResourceBinding bindings[] = {{uniforms_, WGPUBufferBindingType_Uniform}};
  pass_ = gpu_create_render_pass(device, format, main_shader_wgsl, bindings, 1);
  pass_.vertex_count = 21;
}
void HeptagonEffect::render(WGPURenderPassEncoder pass, float t, float b,
                            float i, float a) {
  struct {
    float p, a, t, d;
  } u = {i, a, t, 0.0f};
  wgpuQueueWriteBuffer(queue_, uniforms_.buffer, 0, &u, sizeof(u));
  wgpuRenderPassEncoderSetPipeline(pass, pass_.pipeline);
  wgpuRenderPassEncoderSetBindGroup(pass, 0, pass_.bind_group, 0, nullptr);
  wgpuRenderPassEncoderDraw(pass, pass_.vertex_count, 1, 0, 0);
}

// --- ParticlesEffect ---
ParticlesEffect::ParticlesEffect(WGPUDevice device, WGPUQueue queue,
                                 WGPUTextureFormat format)
    : queue_(queue) {
  uniforms_ =
      gpu_create_buffer(device, sizeof(float) * 4,
                        WGPUBufferUsage_Uniform | WGPUBufferUsage_CopyDst);
  std::vector<Particle> init_p(NUM_PARTICLES);
  particles_buffer_ = gpu_create_buffer(
      device, sizeof(Particle) * NUM_PARTICLES,
      WGPUBufferUsage_Storage | WGPUBufferUsage_Vertex, init_p.data());
  ResourceBinding cb[] = {{particles_buffer_, WGPUBufferBindingType_Storage},
                          {uniforms_, WGPUBufferBindingType_Uniform}};
  compute_pass_ = gpu_create_compute_pass(device, particle_compute_wgsl, cb, 2);
  compute_pass_.workgroup_size_x = (NUM_PARTICLES + 63) / 64;
  ResourceBinding rb[] = {
      {particles_buffer_, WGPUBufferBindingType_ReadOnlyStorage},
      {uniforms_, WGPUBufferBindingType_Uniform}};
  render_pass_ =
      gpu_create_render_pass(device, format, particle_render_wgsl, rb, 2);
  render_pass_.vertex_count = 6;
  render_pass_.instance_count = NUM_PARTICLES;
}
void ParticlesEffect::compute(WGPUCommandEncoder e, float t, float b, float i,
                              float a) {
  struct {
    float p, a, t, d;
  } u = {i, a, t, 0.0f};
  wgpuQueueWriteBuffer(queue_, uniforms_.buffer, 0, &u, sizeof(u));
  WGPUComputePassEncoder pass = wgpuCommandEncoderBeginComputePass(e, nullptr);
  wgpuComputePassEncoderSetPipeline(pass, compute_pass_.pipeline);
  wgpuComputePassEncoderSetBindGroup(pass, 0, compute_pass_.bind_group, 0,
                                     nullptr);
  wgpuComputePassEncoderDispatchWorkgroups(pass, compute_pass_.workgroup_size_x,
                                           1, 1);
  wgpuComputePassEncoderEnd(pass);
}
void ParticlesEffect::render(WGPURenderPassEncoder pass, float t, float b,
                             float i, float a) {
  wgpuRenderPassEncoderSetPipeline(pass, render_pass_.pipeline);
  wgpuRenderPassEncoderSetBindGroup(pass, 0, render_pass_.bind_group, 0,
                                    nullptr);
  wgpuRenderPassEncoderDraw(pass, render_pass_.vertex_count,
                            render_pass_.instance_count, 0, 0);
}

// --- PostProcess Implementation Helper ---
static void pp_update_bind_group(WGPUDevice device, WGPURenderPipeline pipeline,
                                 WGPUBindGroup *bind_group,
                                 WGPUTextureView input_view,
                                 GpuBuffer uniforms) {
  if (*bind_group) wgpuBindGroupRelease(*bind_group);
  WGPUBindGroupLayout bgl = wgpuRenderPipelineGetBindGroupLayout(pipeline, 0);
  WGPUSamplerDescriptor sd = {};
  sd.magFilter = WGPUFilterMode_Linear;
  sd.minFilter = WGPUFilterMode_Linear;
  sd.maxAnisotropy = 1;
  WGPUSampler sampler = wgpuDeviceCreateSampler(device, &sd);
  WGPUBindGroupEntry bge[3] = {};
  bge[0].binding = 0;
  bge[0].sampler = sampler;
  bge[1].binding = 1;
  bge[1].textureView = input_view;
  bge[2].binding = 2;
  bge[2].buffer = uniforms.buffer;
  bge[2].size = uniforms.size;
  WGPUBindGroupDescriptor bgd = {
      .layout = bgl, .entryCount = 3, .entries = bge};
  *bind_group = wgpuDeviceCreateBindGroup(device, &bgd);
}

// --- PassthroughEffect ---
PassthroughEffect::PassthroughEffect(WGPUDevice device,
                                     WGPUTextureFormat format)
    : device_(device) {
  uniforms_ =
      gpu_create_buffer(device, sizeof(float) * 4,
                        WGPUBufferUsage_Uniform | WGPUBufferUsage_CopyDst);
  pipeline_ =
      create_post_process_pipeline(device, format, passthrough_shader_wgsl);
}
void PassthroughEffect::update_bind_group(WGPUTextureView input_view) {
  pp_update_bind_group(device_, pipeline_, &bind_group_, input_view, uniforms_);
}

// --- MovingEllipseEffect ---
MovingEllipseEffect::MovingEllipseEffect(WGPUDevice device, WGPUQueue queue,
                                         WGPUTextureFormat format)
    : queue_(queue) {
  uniforms_ =
      gpu_create_buffer(device, sizeof(float) * 4,
                        WGPUBufferUsage_Uniform | WGPUBufferUsage_CopyDst);
  ResourceBinding bindings[] = {{uniforms_, WGPUBufferBindingType_Uniform}};
  pass_ =
      gpu_create_render_pass(device, format, ellipse_shader_wgsl, bindings, 1);
  pass_.vertex_count = 3;
}
void MovingEllipseEffect::render(WGPURenderPassEncoder pass, float t, float b,
                                 float i, float a) {
  struct {
    float t, b, i, a;
  } u = {t, b, i, a};
  wgpuQueueWriteBuffer(queue_, uniforms_.buffer, 0, &u, sizeof(u));
  wgpuRenderPassEncoderSetPipeline(pass, pass_.pipeline);
  wgpuRenderPassEncoderSetBindGroup(pass, 0, pass_.bind_group, 0, nullptr);
  wgpuRenderPassEncoderDraw(pass, 3, 1, 0, 0);
}

// --- ParticleSprayEffect ---
ParticleSprayEffect::ParticleSprayEffect(WGPUDevice device, WGPUQueue queue,
                                         WGPUTextureFormat format)
    : queue_(queue) {
  uniforms_ =
      gpu_create_buffer(device, sizeof(float) * 4,
                        WGPUBufferUsage_Uniform | WGPUBufferUsage_CopyDst);
  std::vector<Particle> init_p(NUM_PARTICLES);
  for (auto &p : init_p) p.pos[3] = 0.0f;
  particles_buffer_ = gpu_create_buffer(
      device, sizeof(Particle) * NUM_PARTICLES,
      WGPUBufferUsage_Storage | WGPUBufferUsage_Vertex, init_p.data());
  ResourceBinding cb[] = {{particles_buffer_, WGPUBufferBindingType_Storage},
                          {uniforms_, WGPUBufferBindingType_Uniform}};
  compute_pass_ =
      gpu_create_compute_pass(device, particle_spray_compute_wgsl, cb, 2);
  compute_pass_.workgroup_size_x = (NUM_PARTICLES + 63) / 64;
  ResourceBinding rb[] = {
      {particles_buffer_, WGPUBufferBindingType_ReadOnlyStorage},
      {uniforms_, WGPUBufferBindingType_Uniform}};
  render_pass_ =
      gpu_create_render_pass(device, format, particle_render_wgsl, rb, 2);
  render_pass_.vertex_count = 6;
  render_pass_.instance_count = NUM_PARTICLES;
}
void ParticleSprayEffect::compute(WGPUCommandEncoder e, float t, float b,
                                  float i, float a) {
  struct {
    float i, a, t, b;
  } u = {i, a, t, b};
  wgpuQueueWriteBuffer(queue_, uniforms_.buffer, 0, &u, sizeof(u));
  WGPUComputePassEncoder pass = wgpuCommandEncoderBeginComputePass(e, nullptr);
  wgpuComputePassEncoderSetPipeline(pass, compute_pass_.pipeline);
  wgpuComputePassEncoderSetBindGroup(pass, 0, compute_pass_.bind_group, 0,
                                     nullptr);
  wgpuComputePassEncoderDispatchWorkgroups(pass, compute_pass_.workgroup_size_x,
                                           1, 1);
  wgpuComputePassEncoderEnd(pass);
}
void ParticleSprayEffect::render(WGPURenderPassEncoder pass, float t, float b,
                                 float i, float a) {
  wgpuRenderPassEncoderSetPipeline(pass, render_pass_.pipeline);
  wgpuRenderPassEncoderSetBindGroup(pass, 0, render_pass_.bind_group, 0,
                                    nullptr);
  wgpuRenderPassEncoderDraw(pass, 6, NUM_PARTICLES, 0, 0);
}

// --- GaussianBlurEffect ---
GaussianBlurEffect::GaussianBlurEffect(WGPUDevice device, WGPUQueue queue,
                                       WGPUTextureFormat format)
    : device_(device), queue_(queue) {
  uniforms_ =
      gpu_create_buffer(device, sizeof(float) * 4,
                        WGPUBufferUsage_Uniform | WGPUBufferUsage_CopyDst);
  pipeline_ =
      create_post_process_pipeline(device, format, gaussian_blur_shader_wgsl);
}
void GaussianBlurEffect::render(WGPURenderPassEncoder pass, float t, float b,
                                float i, float a) {
  struct {
    float t, b, i, a;
  } u = {t, b, i, a};
  wgpuQueueWriteBuffer(queue_, uniforms_.buffer, 0, &u, sizeof(u));
  PostProcessEffect::render(pass, t, b, i, a);
}
void GaussianBlurEffect::update_bind_group(WGPUTextureView v) {
  pp_update_bind_group(device_, pipeline_, &bind_group_, v, uniforms_);
}

// --- SolarizeEffect ---
SolarizeEffect::SolarizeEffect(WGPUDevice device, WGPUQueue queue,
                               WGPUTextureFormat format)
    : device_(device), queue_(queue) {
  uniforms_ =
      gpu_create_buffer(device, sizeof(float) * 4,
                        WGPUBufferUsage_Uniform | WGPUBufferUsage_CopyDst);
  pipeline_ =
      create_post_process_pipeline(device, format, solarize_shader_wgsl);
}
void SolarizeEffect::render(WGPURenderPassEncoder pass, float t, float b,
                            float i, float a) {
  struct {
    float t, b, i, a;
  } u = {t, b, i, a};
  wgpuQueueWriteBuffer(queue_, uniforms_.buffer, 0, &u, sizeof(u));
  PostProcessEffect::render(pass, t, b, i, a);
}
void SolarizeEffect::update_bind_group(WGPUTextureView v) {
  pp_update_bind_group(device_, pipeline_, &bind_group_, v, uniforms_);
}

// --- DistortEffect ---
DistortEffect::DistortEffect(WGPUDevice device, WGPUQueue queue,
                             WGPUTextureFormat format)
    : device_(device), queue_(queue) {
  uniforms_ =
      gpu_create_buffer(device, sizeof(float) * 4,
                        WGPUBufferUsage_Uniform | WGPUBufferUsage_CopyDst);
  pipeline_ = create_post_process_pipeline(device, format, distort_shader_wgsl);
}
void DistortEffect::render(WGPURenderPassEncoder pass, float t, float b,
                           float i, float a) {
  struct {
    float t, b, i, a;
  } u = {t, b, i, a};
  wgpuQueueWriteBuffer(queue_, uniforms_.buffer, 0, &u, sizeof(u));
  PostProcessEffect::render(pass, t, b, i, a);
}
void DistortEffect::update_bind_group(WGPUTextureView v) {
  pp_update_bind_group(device_, pipeline_, &bind_group_, v, uniforms_);
}

// --- ChromaAberrationEffect ---
ChromaAberrationEffect::ChromaAberrationEffect(WGPUDevice device,
                                               WGPUQueue queue,
                                               WGPUTextureFormat format)
    : device_(device), queue_(queue) {
  uniforms_ =
      gpu_create_buffer(device, sizeof(float) * 4,
                        WGPUBufferUsage_Uniform | WGPUBufferUsage_CopyDst);
  pipeline_ = create_post_process_pipeline(device, format,
                                           chroma_aberration_shader_wgsl);
}
void ChromaAberrationEffect::render(WGPURenderPassEncoder pass, float t,
                                    float b, float i, float a) {
  struct {
    float t, b, i, a;
  } u = {t, b, i, a};
  wgpuQueueWriteBuffer(queue_, uniforms_.buffer, 0, &u, sizeof(u));
  PostProcessEffect::render(pass, t, b, i, a);
}
void ChromaAberrationEffect::update_bind_group(WGPUTextureView v) {
  pp_update_bind_group(device_, pipeline_, &bind_group_, v, uniforms_);
}