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