lg_dds_loader.h

/*
 *      LibGame - Copyright (C) Emmanuel Thomas-Maurin 2011-2026
 *      All rights reserved
 */
 
#ifndef LG_DDS_LOADER_H
#define LG_DDS_LOADER_H
 
#define DDS_MAGIC_SIZE                  ((size_t)4)
#define DDS_MAGIC_AND_HEADER_SIZE       ((size_t)128)
 
/* (From dds.h) */
#define DDS_HEADER_FLAGS_TEXTURE        0x00001007      /* DDSD_WIDTH | DDSD_HEIGHT | DDSD_PIXELFORMAT | DDSD_CAPS */
#define DDS_HEADER_FLAGS_LINEARSIZE     0x00080000      /* DDSD_LINEARSIZE */
#define DDS_HEADER_FLAGS_MIPMAP         0x00020000      /* DDSD_MIPMAPCOUNT */
 
/* (From DDSTextureLoader9.cpp) */
#define MAKEFOURCC(ch0, ch1, ch2, ch3) \
        ((uint32_t)(uint8_t)(ch0) | ((uint32_t)(uint8_t)(ch1) << 8) | \
        ((uint32_t)(uint8_t)(ch2) << 16) | ((uint32_t)(uint8_t)(ch3) << 24 ))
 
typedef struct __attribute__((packed)) {
        uint32_t        size;
        uint32_t        flags;
        uint32_t        sig_4cc;        /* "DXT1" or "DXT3" */
        uint32_t        rgb_bitcount;
        uint32_t        r_mask;
        uint32_t        g_mask;
        uint32_t        b_mask;
        uint32_t        a_mask;
} DDS_PixelFormat;
 
typedef struct __attribute__((packed)) {
        uint32_t        size;           /* 124 */
        uint32_t        flags;          /* Always include DDSD_CAPS, DDSD_PIXELFORMAT, DDSD_WIDTH, DDSD_HEIGHT and either DDSD_PITCH or DDSD_LINEARSIZE */
        uint32_t        h;              /* h first - duh! */
        uint32_t        w;
        uint32_t        pitch_or_linear_size;
        uint32_t        depth;
        uint32_t        mipmap_count;
        uint32_t        reserved1[11];
        DDS_PixelFormat pixel_format;
        uint32_t        caps;
        uint32_t        caps2;
        uint32_t        caps3;
        uint32_t        caps4;
        uint32_t        reserved2;
} DDS_Header;
 
void    *lg_load_dds(const char *, lg_tc_format *, size_t *, int *, int *, int *);
 
#endif /* LG_DDS_LOADER_H */