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glpng.h
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glpng.h
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/*
* PNG loader library for OpenGL v1.45 (10/07/00)
* by Ben Wyatt ben@wyatt100.freeserve.co.uk
* Using LibPNG 1.0.2 and ZLib 1.1.3
*
* This software is provided 'as-is', without any express or implied warranty.
* In no event will the author be held liable for any damages arising from the
* use of this software.
*
* Permission is hereby granted to use, copy, modify, and distribute this
* source code, or portions hereof, for any purpose, without fee, subject to
* the following restrictions:
*
* 1. The origin of this source code must not be misrepresented. You must not
* claim that you wrote the original software. If you use this software in
* a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered versions must be plainly marked as such and must not be
* misrepresented as being the original source.
* 3. This notice must not be removed or altered from any source distribution.
*/
#ifndef _GLPNG_H_
#define _GLPNG_H_
#include <stdio.h>
#ifdef __cplusplus
extern "C" {
#endif
#ifdef _MSC_VER
#ifdef _DEBUG
#pragma comment (lib, "glpngd.lib")
#else
#pragma comment (lib, "glpng.lib")
#endif
#endif
/* XXX This is from Win32's <windef.h> */
#ifndef APIENTRY
#if (_MSC_VER >= 800) || defined(_STDCALL_SUPPORTED)
#define APIENTRY __stdcall
#else
#define APIENTRY
#endif
#endif
/* Mipmapping parameters */
#define PNG_NOMIPMAPS 0 /* No mipmapping */
#define PNG_BUILDMIPMAPS -1 /* Calls a clone of gluBuild2DMipmaps() */
#define PNG_SIMPLEMIPMAPS -2 /* Generates mipmaps without filtering */
/* Who needs an "S" anyway? */
#define PNG_NOMIPMAP PNG_NOMIPMAPS
#define PNG_BUILDMIPMAP PNG_BUILDMIPMAPS
#define PNG_SIMPLEMIPMAP PNG_SIMPLEMIPMAPS
/* Transparency parameters */
#define PNG_CALLBACK -3 /* Call the callback function to generate alpha */
#define PNG_ALPHA -2 /* Use alpha channel in PNG file, if there is one */
#define PNG_SOLID -1 /* No transparency */
#define PNG_STENCIL 0 /* Sets alpha to 0 for r=g=b=0, 1 otherwise */
#define PNG_BLEND1 1 /* a = r+g+b */
#define PNG_BLEND2 2 /* a = (r+g+b)/2 */
#define PNG_BLEND3 3 /* a = (r+g+b)/3 */
#define PNG_BLEND4 4 /* a = r*r+g*g+b*b */
#define PNG_BLEND5 5 /* a = (r*r+g*g+b*b)/2 */
#define PNG_BLEND6 6 /* a = (r*r+g*g+b*b)/3 */
#define PNG_BLEND7 7 /* a = (r*r+g*g+b*b)/4 */
#define PNG_BLEND8 8 /* a = sqrt(r*r+g*g+b*b) */
typedef struct {
unsigned int Width;
unsigned int Height;
unsigned int Depth;
unsigned int Alpha;
} pngInfo;
typedef struct {
unsigned int Width;
unsigned int Height;
unsigned int Depth;
unsigned int Alpha;
unsigned int Components;
unsigned char *Data;
unsigned char *Palette;
} pngRawInfo;
extern int APIENTRY pngLoadRaw(const char *filename, pngRawInfo *rawinfo);
extern int APIENTRY pngLoadRawF(FILE *file, pngRawInfo *rawinfo);
extern int APIENTRY pngLoad(const char *filename, int mipmap, int trans, pngInfo *info);
extern int APIENTRY pngLoadF(FILE *file, int mipmap, int trans, pngInfo *info);
extern unsigned int APIENTRY pngBind(const char *filename, int mipmap, int trans, pngInfo *info, int wrapst, int minfilter, int magfilter);
extern unsigned int APIENTRY pngBindF(FILE *file, int mipmap, int trans, pngInfo *info, int wrapst, int minfilter, int magfilter);
extern void APIENTRY pngSetStencil(unsigned char red, unsigned char green, unsigned char blue);
extern void APIENTRY pngSetAlphaCallback(unsigned char (*callback)(unsigned char red, unsigned char green, unsigned char blue));
extern void APIENTRY pngSetViewingGamma(double viewingGamma);
extern void APIENTRY pngSetStandardOrientation(int standardorientation);
#ifdef __cplusplus
}
#endif
#endif