pxl8/src/pxl8_io.h

#pragma once

#include <stdio.h>
#include <string.h>
#include <sys/stat.h>

#include "pxl8_types.h"

typedef struct {
    const u8* bytes;
    u32 offset;
    u32 size;
} pxl8_stream;

static inline pxl8_stream pxl8_stream_create(const u8* bytes, u32 size) {
    return (pxl8_stream){
        .bytes = bytes,
        .offset = 0,
        .size = size
    };
}

static inline bool pxl8_stream_can_read(const pxl8_stream* stream, u32 count) {
    return stream->offset + count <= stream->size;
}

static inline void pxl8_stream_seek(pxl8_stream* stream, u32 offset) {
    stream->offset = offset;
}

static inline u32 pxl8_stream_position(const pxl8_stream* stream) {
    return stream->offset;
}

static inline u8 pxl8_read_u8(pxl8_stream* stream) {
    return stream->bytes[stream->offset++];
}

static inline u16 pxl8_read_u16(pxl8_stream* stream) {
    u16 val = (u16)stream->bytes[stream->offset] | ((u16)stream->bytes[stream->offset + 1] << 8);
    stream->offset += 2;
    return val;
}

static inline u32 pxl8_read_u32(pxl8_stream* stream) {
    u32 val = (u32)stream->bytes[stream->offset] |
              ((u32)stream->bytes[stream->offset + 1] << 8) |
              ((u32)stream->bytes[stream->offset + 2] << 16) |
              ((u32)stream->bytes[stream->offset + 3] << 24);
    stream->offset += 4;
    return val;
}

static inline i16 pxl8_read_i16(pxl8_stream* stream) {
    return (i16)pxl8_read_u16(stream);
}

static inline i32 pxl8_read_i32(pxl8_stream* stream) {
    return (i32)pxl8_read_u32(stream);
}

static inline f32 pxl8_read_f32(pxl8_stream* stream) {
    u32 val = pxl8_read_u32(stream);
    f32 result;
    memcpy(&result, &val, sizeof(f32));
    return result;
}

static inline void pxl8_read_bytes(pxl8_stream* stream, void* dest, u32 count) {
    for (u32 i = 0; i < count; i++) {
        ((u8*)dest)[i] = stream->bytes[stream->offset++];
    }
}

static inline void pxl8_skip_bytes(pxl8_stream* stream, u32 count) {
    stream->offset += count;
}

static inline const u8* pxl8_read_ptr(pxl8_stream* stream, u32 count) {
    const u8* ptr = &stream->bytes[stream->offset];
    stream->offset += count;
    return ptr;
}

#ifdef __cplusplus
extern "C" {
#endif

pxl8_result pxl8_io_create_directory(const char* path);
bool pxl8_io_file_exists(const char* path);
void pxl8_io_free_binary_data(u8* data);
void pxl8_io_free_file_content(char* content);
f64 pxl8_io_get_file_modified_time(const char* path);
pxl8_result pxl8_io_read_binary_file(const char* path, u8** data, size_t* size);
pxl8_result pxl8_io_read_file(const char* path, char** content, size_t* size);
pxl8_result pxl8_io_write_binary_file(const char* path, const u8* data, size_t size);
pxl8_result pxl8_io_write_file(const char* path, const char* content, size_t size);

bool pxl8_key_down(const pxl8_input_state* input, const char* key_name);
bool pxl8_key_pressed(const pxl8_input_state* input, const char* key_name);
bool pxl8_key_released(const pxl8_input_state* input, const char* key_name);

bool pxl8_mouse_pressed(const pxl8_input_state* input, i32 button);
bool pxl8_mouse_released(const pxl8_input_state* input, i32 button);
i32 pxl8_mouse_wheel_x(const pxl8_input_state* input);
i32 pxl8_mouse_wheel_y(const pxl8_input_state* input);
i32 pxl8_mouse_x(const pxl8_input_state* input);
i32 pxl8_mouse_y(const pxl8_input_state* input);
i32 pxl8_mouse_dx(const pxl8_input_state* input);
i32 pxl8_mouse_dy(const pxl8_input_state* input);

#ifdef __cplusplus
}
#endif