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

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

// --- MovingEllipseEffect ---
MovingEllipseEffect::MovingEllipseEffect(WGPUDevice device, WGPUQueue queue,
                                         WGPUTextureFormat format)
    : Effect(device, queue) {
  uniforms_ =
      gpu_create_buffer(device_, sizeof(float) * 6,
                        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, w, h;
  } u = {t, b, i, a, (float)width_, (float)height_};
  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);
}