153 lines
4.6 KiB
C++
153 lines
4.6 KiB
C++
/*
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* \file texture.hxx
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* Texture manipulation routines
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*
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* Copyright (c) Mark J. Kilgard, 1997.
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* Code added in april 2003 by Erik Hofman
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*
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* This program is freely distributable without licensing fees
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* and is provided without guarantee or warrantee expressed or
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* implied. This program is -not- in the public domain.
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*/
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#ifndef __SG_TEXTURE_HXX
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#define __SG_TEXTURE_HXX 1
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#include <simgear/compiler.h>
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#include <osg/GL>
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#include <zlib.h>
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#include <plib/sg.h>
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/**
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* A class to encapsulate all the info surrounding an OpenGL texture
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* and also query various info and load various file formats
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*/
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class SGTexture {
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private:
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GLuint texture_id;
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GLubyte *texture_data;
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GLsizei texture_width;
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GLsizei texture_height;
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GLsizei num_colors;
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void resize(unsigned int width = 256, unsigned int height = 256);
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const char *errstr;
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protected:
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FILE *file;
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typedef struct _ImageRec {
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_ImageRec(void) : tmp(0), rowStart(0), rowSize(0) {}
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unsigned short imagic;
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unsigned short type;
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unsigned short dim;
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unsigned short xsize, ysize, zsize;
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unsigned int min, max;
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unsigned int wasteBytes;
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char name[80];
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unsigned long colorMap;
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gzFile file;
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GLubyte *tmp;
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unsigned long rleEnd;
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unsigned int *rowStart;
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int *rowSize;
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} ImageRec;
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void ConvertUint(unsigned *array, unsigned int length);
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void ConvertShort(unsigned short *array, unsigned int length);
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void rgbtorgb(GLubyte *r, GLubyte *g, GLubyte *b, GLubyte *l, int n);
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void rgbatorgba(GLubyte *r, GLubyte *g, GLubyte *b, GLubyte *a,
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GLubyte *l, int n);
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ImageRec *ImageOpen(const char *fileName);
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ImageRec *ImageWriteOpen(const char *fileName);
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ImageRec *RawImageOpen(const char *fileName);
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void ImageClose(ImageRec *image);
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void ImageGetRow(ImageRec *image, GLubyte *buf, int y, int z);
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void ImagePutRow(ImageRec *image, GLubyte *buf, int y, int z);
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inline void free_id() {
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#ifdef GL_VERSION_1_1
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glDeleteTextures(1, &texture_id);
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#else
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glDeleteTexturesEXT(1, &texture_id);
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#endif
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texture_id = 0;
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}
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public:
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SGTexture();
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SGTexture(unsigned int width, unsigned int height);
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~SGTexture();
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/* Copyright (c) Mark J. Kilgard, 1997. */
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void read_alpha_texture(const char *name);
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void read_rgb_texture(const char *name);
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void read_rgba_texture(const char *name);
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void read_raw_texture(const char *name);
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void read_r8_texture(const char *name);
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void write_texture(const char *name);
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inline bool usable() { return (texture_id > 0) ? true : false; }
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inline GLuint id() { return texture_id; }
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inline GLubyte *texture() { return texture_data; }
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inline void set_data(GLubyte *data) { texture_data = data; }
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// inline void set_colors(int c) { num_colors = c; }
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inline int width() { return texture_width; }
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inline int height() { return texture_height; }
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inline int colors() { return num_colors; }
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// dynamic texture functions.
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// everything drawn to the OpenGL screen after prepare is
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// called and before finish is called will be included
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// in the new texture.
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void prepare(unsigned int width = 256, unsigned int height = 256);
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void finish(unsigned int width, unsigned int height);
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// texture pixel manipulation functions.
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void set_pixel(GLuint x, GLuint y, GLubyte *c);
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GLubyte *get_pixel(GLuint x, GLuint y);
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void bind();
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inline void select(bool keep_data = false) {
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glTexImage2D( GL_TEXTURE_2D, 0, num_colors,
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texture_width, texture_height, 0,
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(num_colors==1)?GL_LUMINANCE:(num_colors==3)?GL_RGB:GL_RGBA, GL_UNSIGNED_BYTE, texture_data );
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if (!keep_data) {
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delete[] texture_data;
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texture_data = 0;
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}
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}
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// Nowhere does it say that resident textures have to be in video memory!
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// NVidia's OpenGL drivers implement glAreTexturesResident() correctly,
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// but the Matrox G400, for example, doesn't.
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inline bool is_resident() {
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GLboolean is_res;
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glAreTexturesResident(1, &texture_id, &is_res);
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return is_res != 0;
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}
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inline const char *err_str() { return errstr; }
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inline void clear_err_str() { errstr = ""; }
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void make_maxcolorwindow();
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void make_grayscale(float contrast = 1.0);
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void make_monochrome(float contrast = 1.0,
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GLubyte r=255, GLubyte g=255, GLubyte b=255);
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void make_normalmap(float brightness = 1.0, float contrast = 1.0);
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void make_bumpmap(float brightness = 1.0, float contrast = 1.0);
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};
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#endif
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