assimp/include/assimp/texture.h

226 lines
7.7 KiB
C

/*
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Open Asset Import Library (assimp)
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*/
/** @file texture.h
* @brief Defines texture helper structures for the library
*
* Used for file formats which embed their textures into the model file.
* Supported are both normal textures, which are stored as uncompressed
* pixels, and "compressed" textures, which are stored in a file format
* such as PNG or TGA.
*/
#pragma once
#ifndef AI_TEXTURE_H_INC
#define AI_TEXTURE_H_INC
#ifdef __GNUC__
# pragma GCC system_header
#endif
#include <assimp/types.h>
#ifdef __cplusplus
extern "C" {
#endif
// --------------------------------------------------------------------------------
/** \def AI_EMBEDDED_TEXNAME_PREFIX
* \ref AI_MAKE_EMBEDDED_TEXNAME
*/
#ifndef AI_EMBEDDED_TEXNAME_PREFIX
# define AI_EMBEDDED_TEXNAME_PREFIX "*"
#endif
/** @def AI_MAKE_EMBEDDED_TEXNAME
* Used to build the reserved path name used by the material system to
* reference textures that are embedded into their corresponding
* model files. The parameter specifies the index of the texture
* (zero-based, in the aiScene::mTextures array)
*/
#if (!defined AI_MAKE_EMBEDDED_TEXNAME)
# define AI_MAKE_EMBEDDED_TEXNAME(_n_) AI_EMBEDDED_TEXNAME_PREFIX # _n_
#endif
#include "./Compiler/pushpack1.h"
// --------------------------------------------------------------------------------
/** @brief Helper structure to represent a texel in a ARGB8888 format
*
* Used by aiTexture.
*/
struct aiTexel {
unsigned char b,g,r,a;
#ifdef __cplusplus
//! Comparison operator
bool operator== (const aiTexel& other) const
{
return b == other.b && r == other.r &&
g == other.g && a == other.a;
}
//! Inverse comparison operator
bool operator!= (const aiTexel& other) const
{
return b != other.b || r != other.r ||
g != other.g || a != other.a;
}
//! Conversion to a floating-point 4d color
operator aiColor4D() const
{
return aiColor4D(r/255.f,g/255.f,b/255.f,a/255.f);
}
#endif // __cplusplus
} PACK_STRUCT;
#include "./Compiler/poppack1.h"
#define HINTMAXTEXTURELEN 9
// --------------------------------------------------------------------------------
/** Helper structure to describe an embedded texture
*
* Normally textures are contained in external files but some file formats embed
* them directly in the model file. There are two types of embedded textures:
* 1. Uncompressed textures. The color data is given in an uncompressed format.
* 2. Compressed textures stored in a file format like png or jpg. The raw file
* bytes are given so the application must utilize an image decoder (e.g. DevIL) to
* get access to the actual color data.
*
* Embedded textures are referenced from materials using strings like "*0", "*1", etc.
* as the texture paths (a single asterisk character followed by the
* zero-based index of the texture in the aiScene::mTextures array).
*/
struct aiTexture {
/** Width of the texture, in pixels
*
* If mHeight is zero the texture is compressed in a format
* like JPEG. In this case mWidth specifies the size of the
* memory area pcData is pointing to, in bytes.
*/
unsigned int mWidth;
/** Height of the texture, in pixels
*
* If this value is zero, pcData points to an compressed texture
* in any format (e.g. JPEG).
*/
unsigned int mHeight;
/** A hint from the loader to make it easier for applications
* to determine the type of embedded textures.
*
* If mHeight != 0 this member is show how data is packed. Hint will consist of
* two parts: channel order and channel bitness (count of the bits for every
* color channel). For simple parsing by the viewer it's better to not omit
* absent color channel and just use 0 for bitness. For example:
* 1. Image contain RGBA and 8 bit per channel, achFormatHint == "rgba8888";
* 2. Image contain ARGB and 8 bit per channel, achFormatHint == "argb8888";
* 3. Image contain RGB and 5 bit for R and B channels and 6 bit for G channel, achFormatHint == "rgba5650";
* 4. One color image with B channel and 1 bit for it, achFormatHint == "rgba0010";
* If mHeight == 0 then achFormatHint is set set to '\\0\\0\\0\\0' if the loader has no additional
* information about the texture file format used OR the
* file extension of the format without a trailing dot. If there
* are multiple file extensions for a format, the shortest
* extension is chosen (JPEG maps to 'jpg', not to 'jpeg').
* E.g. 'dds\\0', 'pcx\\0', 'jpg\\0'. All characters are lower-case.
* The fourth character will always be '\\0'.
*/
char achFormatHint[ HINTMAXTEXTURELEN ];// 8 for string + 1 for terminator.
/** Data of the texture.
*
* Points to an array of mWidth * mHeight aiTexel's.
* The format of the texture data is always ARGB8888 to
* make the implementation for user of the library as easy
* as possible. If mHeight = 0 this is a pointer to a memory
* buffer of size mWidth containing the compressed texture
* data. Good luck, have fun!
*/
C_STRUCT aiTexel* pcData;
/** Texture original filename
*
* Used to get the texture reference
*/
C_STRUCT aiString mFilename;
#ifdef __cplusplus
//! For compressed textures (mHeight == 0): compare the
//! format hint against a given string.
//! @param s Input string. 3 characters are maximally processed.
//! Example values: "jpg", "png"
//! @return true if the given string matches the format hint
bool CheckFormat(const char* s) const {
if (nullptr == s) {
return false;
}
return (0 == ::strncmp(achFormatHint, s, sizeof(achFormatHint)));
}
// Construction
aiTexture() AI_NO_EXCEPT
: mWidth(0)
, mHeight(0)
, pcData(nullptr)
, mFilename() {
memset(achFormatHint, 0, sizeof(achFormatHint));
}
// Destruction
~aiTexture () {
delete[] pcData;
}
#endif
};
#ifdef __cplusplus
}
#endif
#endif // AI_TEXTURE_H_INC