// This file is part of the 64k demo project.
// It declares helper functions for post-processing effects.

#pragma once

#include "gpu/gpu.h"
#include "util/mini_math.h"

// Uniform data common to all post-processing effects
struct CommonPostProcessUniforms {
  vec2 resolution;
  float _pad[2]; // Padding for 16-byte alignment
  float aspect_ratio;
  float time;
  float beat;
  float audio_intensity;
};
static_assert(sizeof(CommonPostProcessUniforms) == 32,
              "CommonPostProcessUniforms must be 32 bytes for WGSL alignment");

// Standard post-process bind group layout (group 0):
#define PP_BINDING_SAMPLER 0       // Sampler for input texture
#define PP_BINDING_TEXTURE 1       // Input texture (previous render pass)
#define PP_BINDING_UNIFORMS 2      // Custom uniforms buffer
#define PP_BINDING_EFFECT_PARAMS 3 // Effect-specific parameters

// Helper to create a standard post-processing pipeline
// Uniforms are accessible to both vertex and fragment shaders
WGPURenderPipeline create_post_process_pipeline(WGPUDevice device,
                                                WGPUTextureFormat format,
                                                const char* shader_code);

// Helper to update bind group for post-processing effects
void pp_update_bind_group(WGPUDevice device, WGPURenderPipeline pipeline,
                          WGPUBindGroup* bind_group, WGPUTextureView input_view,
                          GpuBuffer uniforms, GpuBuffer effect_params);