njin_spatial_batch.h

#pragma once
#include "_types.h"
#include <span>
#include <utility>
#include <vector>
 
namespace njin {


struct batch_grid2d {
  vec2 origin{};          
  vec2 cell_size{1, 1};   
  i32 cols = 0;           
  i32 rows = 0;           
  i32 count() const;
  i32 cell_at(vec2 p) const;
};

struct batch_view2d {
  vec2 lo{};    
  vec2 hi{};    
  vec2 focus{}; 
  f32 overhang = 0;
};

bool batch_cell_visible(const batch_grid2d &grid, const batch_view2d &view, i32 cell);

bool batch_cell_detailed(const batch_grid2d &grid, const batch_view2d &view, i32 cell, f32 radius);

using instance_range = std::pair<u32, u32>;

std::vector<instance_range> batch_instance_ranges(std::span<const u32> offsets,
    std::span<const u8> wanted, std::span<const instance_range> excluded = {});

 
} // namespace njin