// This file is part of the 64k demo project.
// It implements the MovingEllipseEffect.

#include "gpu/demo_effects.h"
#include "gpu/effects/post_process_helper.h"
#include "gpu/gpu.h"

// --- MovingEllipseEffect ---
MovingEllipseEffect::MovingEllipseEffect(const GpuContext& ctx) : Effect(ctx) {
  uniforms_ =
      gpu_create_buffer(ctx_.device, sizeof(CommonPostProcessUniforms),
                        WGPUBufferUsage_Uniform | WGPUBufferUsage_CopyDst);
  ResourceBinding bindings[] = {{uniforms_, WGPUBufferBindingType_Uniform}};
  pass_ = gpu_create_render_pass(ctx_.device, ctx_.format, ellipse_shader_wgsl,
                                 bindings, 1);
  pass_.vertex_count = 3;
}
void MovingEllipseEffect::render(WGPURenderPassEncoder pass, float t, float b,
                                 float i, float a) {
  const CommonPostProcessUniforms u = {
      .resolution = {(float)width_, (float)height_},
      .aspect_ratio = a,
      .time = t,
      .beat = b,
      .audio_intensity = i,
  };
  wgpuQueueWriteBuffer(ctx_.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);
}