shader.h

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#ifndef BJ_SHADER_H
#define BJ_SHADER_H
 
#include <banjo/api.h>
#include <banjo/bitmap.h>
#include <banjo/vec.h>

typedef int (*bj_bitmap_shading_fn)(struct bj_vec3* out_color, const struct bj_vec2 pixel_coord, void* user_data);

enum bj_shader_flag {

    BJ_SHADER_INVERT_X         = 0x01,

    BJ_SHADER_INVERT_Y         = 0x02,

    BJ_SHADER_CLAMP_COLOR      = 0x04,

    BJ_SHADER_NORMALIZE_COORDS = 0x08,

    BJ_SHADER_CENTER_COORDS    = 0x10,
 
};

#define BJ_SHADER_STANDARD_FLAGS (BJ_SHADER_INVERT_Y | BJ_SHADER_CLAMP_COLOR | BJ_SHADER_NORMALIZE_COORDS | BJ_SHADER_CENTER_COORDS)

BANJO_EXPORT void bj_shader_bitmap(
    struct bj_bitmap*             bitmap,
    bj_bitmap_shading_fn shader,
    void*                  data,
    uint8_t                flags
);
 
#endif