// This file is part of the 64k demo project.
// It defines the interface for procedural texture generation.
// Used to generate texture data at runtime.

#pragma once

#include <cstdint>

// Procedural generation function signature
// buffer: Pointer to RGBA8 buffer (size w * h * 4)
// w, h: Dimensions
// params: Arbitrary float parameters for the generator
// Returns true on success, false on failure.
typedef bool (*ProcGenFunc)(uint8_t* buffer, int w, int h, const float* params,
                            int num_params);

namespace procedural {

// Simple noise generator
// Params[0]: Seed, Params[1]: Frequency
bool gen_noise(uint8_t* buffer, int w, int h, const float* params,
               int num_params);

// Perlin noise generator
// Params[0]: Seed
// Params[1]: Frequency (Scale)
// Params[2]: Amplitude
// Params[3]: Amplitude decay (e.g. 0.5)
// Params[4]: Number of octaves (int)
bool gen_perlin(uint8_t* buffer, int w, int h, const float* params,
                int num_params);

// Example: Grid pattern
bool gen_grid(uint8_t* buffer, int w, int h, const float* params,
              int num_params);

// Post-process: Make texture periodic by blending edges
// Params[0]: Border size ratio (0.0 - 0.5), default 0.1
bool make_periodic(uint8_t* buffer, int w, int h, const float* params,
                   int num_params);

// Plasma: classic sine-sum color texture
// Params[0]: time/seed offset, Params[1]: frequency multiplier (default 2.0)
bool gen_plasma(uint8_t* buffer, int w, int h, const float* params,
                int num_params);

// Voronoi (Worley) cellular noise
// Params[0]: cell scale (default 4.0)
// Params[1]: mode: 0=F1, 1=F2, 2=F2-F1 borders (default 2)
// Params[2]: seed
bool gen_voronoi(uint8_t* buffer, int w, int h, const float* params,
                 int num_params);

// Post-process: convert grayscale height (R channel) to RGB normal map
// Params[0]: strength (default 4.0)
bool gen_normalmap(uint8_t* buffer, int w, int h, const float* params,
                   int num_params);

#if !defined(DEMO_STRIP_ALL)
// Test-only: Failing generator
bool gen_fail(uint8_t* buffer, int w, int h, const float* params,
              int num_params);
#endif

} // namespace procedural