src/atlas.h


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#pragma once

#include "cglm/types.h"
#include "sokol_gfx.h"
#include "utils.h"

enum atlas_error_e : u8 {
  ATLAS_ERROR_NONE = 0,
  ATLAS_ERROR_GPU_ATLAS,
  ATLAS_ERROR_ATLAS_FULL,
  ATLAS_ERROR_UPLOAD_FAILED,
};

struct atlas_packer_s {
  vec2 cursor;
  u32 row_height;
};

struct atlas_s {
  u32 width, height;
  enum sg_pixel_format format;
  struct sg_image gpu_atlas;
  u8* cpu_atlas;
  bool cpu_dirty;
  struct atlas_packer_s packer;
};

enum atlas_error_e wayc_atlas_init(struct atlas_s* atlas, u32 width, u32 height,
                                   enum sg_pixel_format format);
enum atlas_error_e wayc_atlas_insert(struct atlas_s* atlas, u32 width,
                                     u32 height, const u8* data, vec2* uv0,
                                     vec2* uv1);
enum atlas_error_e wayc_atlas_flush(struct atlas_s* atlas);
void wayc_atlas_deinit(struct atlas_s* atlas);