shader.h

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#pragma once
 
#include <banjo/api.h>
#include <banjo/bitmap.h>
#include <banjo/linmath.h>

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

BANJO_EXPORT float bj_clamp(
    float x,
    float min,
    float max
);

BANJO_EXPORT float bj_step(
    float edge,
    float x
);

BANJO_EXPORT float bj_smoothstep(
    float edge0,
    float edge1,
    float x
);

BANJO_EXPORT float bj_fract(
    float x
);

BANJO_EXPORT int bj_mod(
    float x,
    float y
);

typedef enum bj_shader_flag_t {

    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,
 
} bj_shader_flag;

#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_bitmap_apply_shader(
    bj_bitmap*             p_bitmap,
    bj_bitmap_shading_fn_t p_shader,
    void*                  p_data,
    uint8_t                flags
);