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Move the texture code over from SimGear/simgear/screen

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ehofman 2009-06-22 09:37:23 +00:00 committed by Tim Moore
parent c7e1994d7b
commit 575d4c7770
4 changed files with 1407 additions and 1 deletions
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2
utils/Modeller/Makefile.am
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@ -7,7 +7,7 @@ noinst_PROGRAMS = animassist normalmap photomodel
animassist_SOURCES = animassist.c animassist_SOURCES = animassist.c
animassist_LDADD = $(base_LIBS) animassist_LDADD = $(base_LIBS)
normalmap_SOURCES = normalmap.cxx normalmap_SOURCES = normalmap.cxx texture.cxx texture.hxx colours.h
normalmap_LDADD = -lsgscreen $(opengl_LIBS) $(base_LIBS) -lz normalmap_LDADD = -lsgscreen $(opengl_LIBS) $(base_LIBS) -lz
photomodel_SOURCES = photomodel.cxx photomodel_SOURCES = photomodel.cxx

289
utils/Modeller/colours.h Normal file
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@ -0,0 +1,289 @@
// colours.h -- This header file contains colour definitions in the
// same way as MS FS5 does
//
// Contributed by "Christian Mayer" <Vader@t-online.de>, started April 1999.
//
// Copyright (C) 1998 Christian Mayer - Vader@t-online.de
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// $Id$
#ifndef COLOURS_H
#define COLOURS_H
unsigned char msfs_colour[256][3]=
{
{ 0, 0, 0},
{ 8, 8, 8},
{ 16, 16, 16},
{ 24, 24, 24},
{ 32, 32, 32},
{ 40, 40, 40},
{ 48, 48, 48},
{ 56, 56, 56},
{ 65, 65, 65},
{ 73, 73, 73},
{ 81, 81, 81},
{ 89, 89, 89},
{ 97, 97, 97},
{105, 105, 105},
{113, 113, 113},
{121, 121, 121},
{130, 130, 130},
{138, 138, 138},
{146, 146, 146},
{154, 154, 154},
{162, 162, 162},
{170, 170, 170},
{178, 178, 178},
{186, 186, 186},
{195, 195, 195},
{203, 203, 203},
{211, 211, 211},
{219, 219, 219},
{227, 227, 227},
{235, 235, 235},
{247, 247, 247},
{255, 255, 255},
{ 21, 5, 5},
{ 42, 10, 10},
{ 63, 15, 15},
{ 84, 20, 20},
{105, 25, 25},
{126, 30, 30},
{147, 35, 35},
{168, 40, 40},
{189, 45, 45},
{210, 50, 50},
{231, 55, 55},
{252, 60, 60},
{ 5, 21, 5},
{ 10, 42, 10},
{ 15, 63, 15},
{ 20, 84, 20},
{ 25, 105, 25},
{ 30, 126, 30},
{ 35, 147, 35},
{ 40, 168, 40},
{ 45, 189, 45},
{ 50, 210, 50},
{ 55, 231, 55},
{ 60, 252, 60},
{ 0, 7, 23},
{ 0, 15, 40},
{ 0, 23, 58},
{ 0, 40, 84},
{ 0, 64, 104},
{ 0, 71, 122},
{ 0, 87, 143},
{ 0, 99, 156},
{ 0, 112, 179},
{ 0, 128, 199},
{ 0, 143, 215},
{ 0, 153, 230},
{ 28, 14, 0},
{ 56, 28, 0},
{ 84, 42, 0},
{112, 56, 0},
{140, 70, 0},
{168, 84, 0},
{196, 98, 0},
{224, 112, 0},
{252, 126, 0},
{ 28, 28, 0},
{ 56, 56, 0},
{ 84, 84, 0},
{112, 112, 0},
{140, 140, 0},
{168, 168, 0},
{196, 196, 0},
{224, 224, 0},
{252, 252, 0},
{ 25, 21, 16},
{ 50, 42, 32},
{ 75, 63, 48},
{100, 84, 64},
{125, 105, 80},
{150, 126, 96},
{175, 147, 112},
{200, 168, 128},
{225, 189, 144},
{ 28, 11, 7},
{ 56, 22, 14},
{ 84, 33, 21},
{112, 44, 28},
{140, 55, 35},
{168, 66, 42},
{196, 77, 49},
{224, 88, 56},
{252, 99, 63},
{ 17, 22, 9},
{ 34, 44, 18},
{ 51, 66, 27},
{ 68, 88, 36},
{ 85, 110, 45},
{102, 132, 54},
{119, 154, 63},
{136, 176, 72},
{153, 198, 81},
{ 0, 58, 104},
{ 0, 87, 112},
{ 43, 112, 128},
{255, 0, 0},
{ 64, 255, 64},
{ 0, 0, 192},
{ 0, 105, 105},
{255, 128, 0},
{255, 255, 0},
{ 81, 81, 81},
{121, 121, 121},
{146, 146, 146},
{170, 170, 170},
{195, 195, 195},
{227, 227, 227},
{ 0, 0, 0},
{ 0, 0, 0},
{ 0, 0, 0},
{ 0, 0, 0},
{ 0, 0, 0},
{ 0, 0, 0},
{ 0, 0, 0},
{ 0, 0, 0},
{ 0, 0, 0},
{ 0, 0, 0},
{ 0, 0, 0},
{ 0, 0, 0},
{ 0, 0, 0},
{ 0, 0, 0},
{ 0, 0, 0},
{ 0, 0, 0},
{ 0, 0, 0},
{ 0, 0, 0},
{ 0, 0, 0},
{ 0, 0, 0},
{ 0, 0, 0},
{ 0, 0, 0},
{ 0, 0, 0},
{ 0, 0, 0},
{ 0, 0, 0},
{ 0, 0, 0},
{ 0, 0, 0},
{ 0, 0, 0},
{ 0, 0, 0},
{ 0, 0, 0},
{ 0, 0, 0},
{ 0, 0, 0},
{192, 192, 255},
{200, 200, 255},
{208, 208, 255},
{216, 216, 255},
{224, 224, 255},
{232, 232, 255},
{240, 240, 255},
{248, 248, 255},
{255, 255, 255},
{255, 255, 255},
{255, 255, 255},
{255, 255, 255},
{255, 255, 255},
{255, 255, 255},
{255, 255, 255},
{255, 255, 255},
{ 16, 72, 16},
{ 32, 80, 32},
{ 48, 88, 48},
{ 64, 96, 64},
{ 80, 104, 80},
{ 96, 112, 96},
{112, 120, 112},
{120, 124, 120},
{128, 128, 128},
{128, 128, 128},
{128, 128, 128},
{128, 128, 128},
{128, 128, 128},
{128, 128, 128},
{128, 128, 128},
{128, 128, 128},
{ 33, 140, 189},
{ 57, 132, 165},
{189, 66, 66},
{156, 66, 66},
{132, 74, 74},
{ 33, 82, 107},
{214, 90, 82},
{189, 90, 82},
{165, 90, 82},
{123, 57, 49},
{ 99, 57, 49},
{107, 74, 66},
{123, 90, 82},
{181, 90, 66},
{ 74, 49, 41},
{189, 115, 90},
{140, 90, 49},
{ 33, 49, 74},
{181, 115, 49},
{ 99, 66, 33},
{165, 115, 66},
{ 49, 41, 33},
{165, 140, 115},
{189, 165, 140},
{ 57, 99, 123},
{181, 107, 24},
{206, 123, 33},
{156, 99, 33},
{148, 107, 49},
{107, 82, 49},
{ 33, 33, 57},
{ 33, 115, 165},
{214, 214, 33},
{173, 173, 33},
{198, 198, 41},
{140, 140, 33},
{115, 115, 33},
{189, 189, 57},
{156, 156, 49},
{173, 173, 57},
{123, 123, 49},
{123, 123, 66},
{ 74, 74, 49},
{123, 123, 90},
{ 41, 41, 33},
{ 90, 99, 57},
{107, 115, 74},
{123, 148, 82},
{140, 173, 99},
{132, 156, 99},
{ 49, 66, 41},
{ 99, 165, 90},
{ 74, 214, 74},
{ 57, 140, 57},
{ 74, 181, 74},
{ 90, 198, 90},
{ 57, 123, 57},
{ 49, 99, 49},
{ 90, 165, 90},
{ 82, 148, 82},
{ 74, 99, 74},
{ 57, 115, 132},
{ 33, 99, 123},
{ 74, 115, 132}
};
#endif

964
utils/Modeller/texture.cxx Normal file
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@ -0,0 +1,964 @@
/*
* Texture manipulation routines
*
* Copyright (c) Mark J. Kilgard, 1997.
* Code added in april 2003 by Erik Hofman
*
* This program is freely distributable without licensing fees
* and is provided without guarantee or warrantee expressed or
* implied. This program is -not- in the public domain.
*
* $Id$
*/
#include <simgear/compiler.h>
#ifdef WIN32
# include <windows.h>
#endif
#include <osg/GLU>
#include <math.h>
#include <zlib.h>
#include "texture.hxx"
#include "colours.h"
const char *FILE_OPEN_ERROR = "Unable to open file.";
const char *WRONG_COUNT = "Unsupported number of color channels.";
const char *NO_TEXTURE = "No texture data resident.";
const char *OUT_OF_MEMORY = "Out of memory.";
SGTexture::SGTexture()
: texture_id(0),
texture_data(0),
num_colors(3),
file(0)
{
}
SGTexture::SGTexture(unsigned int width, unsigned int height)
: texture_id(0),
errstr("")
{
texture_data = new GLubyte[ width * height * 3 ];
}
SGTexture::~SGTexture()
{
delete[] texture_data;
if ( texture_id != 0 ) {
free_id();
}
}
void
SGTexture::bind()
{
bool gen = false;
if (!texture_id) {
#ifdef GL_VERSION_1_1
glGenTextures(1, &texture_id);
#elif GL_EXT_texture_object
glGenTexturesEXT(1, &texture_id);
#endif
gen = true;
}
#ifdef GL_VERSION_1_1
glBindTexture(GL_TEXTURE_2D, texture_id);
#elif GL_EXT_texture_object
glBindTextureEXT(GL_TEXTURE_2D, texture_id);
#endif
if (gen) {
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
}
}
/**
* A function to resize the OpenGL window which will be used by
* the dynamic texture generating routines.
*
* @param width The width of the new window
* @param height The height of the new window
*/
void
SGTexture::resize(unsigned int width, unsigned int height)
{
GLfloat aspect;
// Make sure that we don't get a divide by zero exception
if (height == 0)
height = 1;
// Set the viewport for the OpenGL window
glViewport(0, 0, width, height);
// Calculate the aspect ratio of the window
aspect = width/height;
// Go to the projection matrix, this gets modified by the perspective
// calulations
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
// Do the perspective calculations
gluPerspective(45.0, aspect, 1.0, 400.0);
// Return to the modelview matrix
glMatrixMode(GL_MODELVIEW);
}
/**
* A function to prepare the OpenGL state machine for dynamic
* texture generation.
*
* @param width The width of the texture
* @param height The height of the texture
*/
void
SGTexture::prepare(unsigned int width, unsigned int height) {
texture_width = width;
texture_height = height;
// Resize the OpenGL window to the size of our dynamic texture
resize(texture_width, texture_height);
glClearColor(0.0, 0.0, 0.0, 1.0);
}
/**
* A function to generate the dynamic texture.
*
* The actual texture can be accessed by calling get_texture()
*
* @param width The width of the previous OpenGL window
* @param height The height of the previous OpenGL window
*/
void
SGTexture::finish(unsigned int width, unsigned int height) {
// If a texture hasn't been created then it gets created, and the contents
// of the frame buffer gets copied into it. If the texture has already been
// created then its contents just get updated.
bind();
if (!texture_data)
{
// Copies the contents of the frame buffer into the texture
glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 0, 0,
texture_width, texture_height, 0);
} else {
// Copies the contents of the frame buffer into the texture
glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0,
texture_width, texture_height);
}
// Set the OpenGL window back to its previous size
resize(width, height);
// Clear the window back to black
glClearColor(0.0, 0.0, 0.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
}
void
SGTexture::read_alpha_texture(const char *name)
{
GLubyte *lptr;
SGTexture::ImageRec *image;
int y;
delete[] texture_data;
image = ImageOpen(name);
if(!image) {
errstr = FILE_OPEN_ERROR;
return;
}
texture_width = image->xsize;
texture_height = image->ysize;
// printf("image->zsize = %d\n", image->zsize);
if (image->zsize != 1) {
ImageClose(image);
errstr = WRONG_COUNT;
return;
}
texture_data = new GLubyte[ image->xsize * image->ysize ];
num_colors = 1;
if (!texture_data) {
errstr = NO_TEXTURE;
return;
}
lptr = texture_data;
for(y=0; y<image->ysize; y++) {
ImageGetRow(image,lptr,y,0);
lptr += image->xsize;
}
ImageClose(image);
}
void
SGTexture::read_rgb_texture(const char *name)
{
GLubyte *ptr;
GLubyte *rbuf, *gbuf, *bbuf;
SGTexture::ImageRec *image;
int y;
delete[] texture_data;
image = ImageOpen(name);
if(!image) {
errstr = FILE_OPEN_ERROR;
return;
}
texture_width = image->xsize;
texture_height = image->ysize;
if (image->zsize < 1 || image->zsize > 4) {
ImageClose(image);
errstr = WRONG_COUNT;
return;
}
num_colors = 3;
texture_data = new GLubyte[ image->xsize * image->ysize * num_colors ];
rbuf = new GLubyte[ image->xsize ];
gbuf = new GLubyte[ image->xsize ];
bbuf = new GLubyte[ image->xsize ];
if(!texture_data || !rbuf || !gbuf || !bbuf) {
delete[] texture_data;
delete[] rbuf;
delete[] gbuf;
delete[] bbuf;
errstr = OUT_OF_MEMORY;
return;
}
ptr = texture_data;
for(y=0; y<image->ysize; y++) {
if(image->zsize == 4 || image->zsize == 3) {
ImageGetRow(image,rbuf,y,0);
ImageGetRow(image,gbuf,y,1);
ImageGetRow(image,bbuf,y,2);
} else {
ImageGetRow(image,rbuf,y,0);
memcpy(gbuf,rbuf,image->xsize);
memcpy(bbuf,rbuf,image->xsize);
}
rgbtorgb(rbuf,gbuf,bbuf,ptr,image->xsize);
ptr += (image->xsize * num_colors);
}
ImageClose(image);
delete[] rbuf;
delete[] gbuf;
delete[] bbuf;
}
void
SGTexture::read_rgba_texture(const char *name)
{
GLubyte *ptr;
GLubyte *rbuf, *gbuf, *bbuf, *abuf;
SGTexture::ImageRec *image;
int y;
delete[] texture_data;
image = ImageOpen(name);
if(!image) {
errstr = FILE_OPEN_ERROR;
return;
}
texture_width = image->xsize;
texture_height = image->ysize;
if (image->zsize < 1 || image->zsize > 4) {
ImageClose(image);
errstr = WRONG_COUNT;
return;
}
num_colors = 4;
texture_data = new GLubyte[ image->xsize * image->ysize * num_colors ];
rbuf = new GLubyte[ image->xsize ];
gbuf = new GLubyte[ image->xsize ];
bbuf = new GLubyte[ image->xsize ];
abuf = new GLubyte[ image->xsize ];
if(!texture_data || !rbuf || !gbuf || !bbuf || !abuf) {
delete[] texture_data;
delete[] rbuf;
delete[] gbuf;
delete[] bbuf;
delete[] abuf;
errstr = OUT_OF_MEMORY;
return;
}
ptr = texture_data;
for(y=0; y<image->ysize; y++) {
if(image->zsize == 4) {
ImageGetRow(image,rbuf,y,0);
ImageGetRow(image,gbuf,y,1);
ImageGetRow(image,bbuf,y,2);
ImageGetRow(image,abuf,y,3);
} else if(image->zsize == 3) {
ImageGetRow(image,rbuf,y,0);
ImageGetRow(image,gbuf,y,1);
ImageGetRow(image,bbuf,y,2);
memset(abuf, 255, image->xsize);
} else if(image->zsize == 2) {
ImageGetRow(image,rbuf,y,0);
memcpy(gbuf,rbuf,image->xsize);
memcpy(bbuf,rbuf,image->xsize);
ImageGetRow(image,abuf,y,1);
} else {
ImageGetRow(image,rbuf,y,0);
memcpy(gbuf,rbuf,image->xsize);
memcpy(bbuf,rbuf,image->xsize);
memset(abuf, 255, image->xsize);
}
rgbatorgba(rbuf,gbuf,bbuf,abuf,ptr,image->xsize);
ptr += (image->xsize * num_colors);
}
ImageClose(image);
delete[] rbuf;
delete[] gbuf;
delete[] bbuf;
delete[] abuf;
}
void
SGTexture::read_raw_texture(const char *name)
{
GLubyte *ptr;
SGTexture::ImageRec *image;
int y;
delete[] texture_data;
image = RawImageOpen(name);
if(!image) {
errstr = FILE_OPEN_ERROR;
return;
}
texture_width = 256;
texture_height = 256;
texture_data = new GLubyte[ 256 * 256 * 3 ];
if(!texture_data) {
errstr = OUT_OF_MEMORY;
return;
}
ptr = texture_data;
for(y=0; y<256; y++) {
gzread(image->file, ptr, 256*3);
ptr+=256*3;
}
ImageClose(image);
}
void
SGTexture::read_r8_texture(const char *name)
{
unsigned char c[1];
GLubyte *ptr;
SGTexture::ImageRec *image;
int xy;
delete[] texture_data;
//it wouldn't make sense to write a new function ...
image = RawImageOpen(name);
if(!image) {
errstr = FILE_OPEN_ERROR;
return;
}
texture_width = 256;
texture_height = 256;
texture_data = new GLubyte [ 256 * 256 * 3 ];
if(!texture_data) {
errstr = OUT_OF_MEMORY;
return;
}
ptr = texture_data;
for(xy=0; xy<(256*256); xy++) {
gzread(image->file, c, 1);
//look in the table for the right colours
ptr[0]=msfs_colour[c[0]][0];
ptr[1]=msfs_colour[c[0]][1];
ptr[2]=msfs_colour[c[0]][2];
ptr+=3;
}
ImageClose(image);
}
void
SGTexture::write_texture(const char *name) {
SGTexture::ImageRec *image = ImageWriteOpen(name);
for (int c=0; c<num_colors; c++) {
GLubyte *ptr = texture_data + c;
for (int y=0; y<texture_height; y++) {
for (int x=0; x<texture_width; x++) {
image->tmp[x]=*ptr;
ptr = ptr + num_colors;
}
fwrite(image->tmp, 1, texture_width, file);
}
}
ImageClose(image);
}
void
SGTexture::set_pixel(GLuint x, GLuint y, GLubyte *c)
{
if (!texture_data) {
errstr = NO_TEXTURE;
return;
}
unsigned int pos = (x + y*texture_width) * num_colors;
memcpy(texture_data+pos, c, num_colors);
}
GLubyte *
SGTexture::get_pixel(GLuint x, GLuint y)
{
static GLubyte c[4] = {0, 0, 0, 0};
if (!texture_data) {
errstr = NO_TEXTURE;
return c;
}
unsigned int pos = (x + y*texture_width)*num_colors;
memcpy(c, texture_data + pos, num_colors);
return c;
}
SGTexture::ImageRec *
SGTexture::ImageOpen(const char *fileName)
{
union {
int testWord;
char testByte[4];
} endianTest;
SGTexture::ImageRec *image;
int swapFlag;
int x;
endianTest.testWord = 1;
if (endianTest.testByte[0] == 1) {
swapFlag = 1;
} else {
swapFlag = 0;
}
image = new SGTexture::ImageRec;
memset(image, 0, sizeof(SGTexture::ImageRec));
if (image == 0) {
errstr = OUT_OF_MEMORY;
return 0;
}
if ((image->file = gzopen(fileName, "rb")) == 0) {
errstr = FILE_OPEN_ERROR;
return 0;
}
gzread(image->file, image, 12);
if (swapFlag) {
ConvertShort(&image->imagic, 6);
}
image->tmp = new GLubyte[ image->xsize * 256 ];
if (image->tmp == 0) {
errstr = OUT_OF_MEMORY;
return 0;
}
if ((image->type & 0xFF00) == 0x0100) {
x = image->ysize * image->zsize * (int) sizeof(unsigned);
image->rowStart = new unsigned[x];
image->rowSize = new int[x];
if (image->rowStart == 0 || image->rowSize == 0) {
errstr = OUT_OF_MEMORY;
return 0;
}
image->rleEnd = 512 + (2 * x);
gzseek(image->file, 512, SEEK_SET);
gzread(image->file, image->rowStart, x);
gzread(image->file, image->rowSize, x);
if (swapFlag) {
ConvertUint(image->rowStart, x/(int) sizeof(unsigned));
ConvertUint((unsigned *)image->rowSize, x/(int) sizeof(int));
}
}
return image;
}
void
SGTexture::ImageClose(SGTexture::ImageRec *image) {
if (image->file) gzclose(image->file);
if (file) fclose(file);
delete[] image->tmp;
delete[] image->rowStart;
delete[] image->rowSize;
delete image;
}
SGTexture::ImageRec *
SGTexture::RawImageOpen(const char *fileName)
{
union {
int testWord;
char testByte[4];
} endianTest;
SGTexture::ImageRec *image;
int swapFlag;
endianTest.testWord = 1;
if (endianTest.testByte[0] == 1) {
swapFlag = 1;
} else {
swapFlag = 0;
}
image = new SGTexture::ImageRec;
memset(image, 0, sizeof(SGTexture::ImageRec));
if (image == 0) {
errstr = OUT_OF_MEMORY;
return 0;
}
if ((image->file = gzopen(fileName, "rb")) == 0) {
errstr = FILE_OPEN_ERROR;
return 0;
}
gzread(image->file, image, 12);
if (swapFlag) {
ConvertShort(&image->imagic, 6);
}
//just allocate a pseudo value as I'm too lazy to change ImageClose()...
image->tmp = new GLubyte[1];
if (image->tmp == 0) {
errstr = OUT_OF_MEMORY;
return 0;
}
return image;
}
SGTexture::ImageRec *
SGTexture::ImageWriteOpen(const char *fileName)
{
union {
int testWord;
char testByte[4];
} endianTest;
ImageRec* image;
int swapFlag;
int x;
endianTest.testWord = 1;
if (endianTest.testByte[0] == 1) {
swapFlag = 1;
} else {
swapFlag = 0;
}
image = new SGTexture::ImageRec;
memset(image, 0, sizeof(SGTexture::ImageRec));
if (image == 0) {
errstr = OUT_OF_MEMORY;
return 0;
}
if ((file = fopen(fileName, "wb")) == 0) {
errstr = FILE_OPEN_ERROR;
return 0;
}
image->imagic = 474;
image->type = 0x0001;
image->dim = (num_colors > 1) ? 3 : 2;
image->xsize = texture_width;
image->ysize = texture_height;
image->zsize = num_colors;
if (swapFlag) {
ConvertShort(&image->imagic, 6);
}
fwrite(image, 1, 12, file);
fseek(file, 512, SEEK_SET);
image->tmp = new GLubyte[ image->xsize * 256 ];
if (image->tmp == 0) {
errstr = OUT_OF_MEMORY;
return 0;
}
if ((image->type & 0xFF00) == 0x0100) {
x = image->ysize * image->zsize * (int) sizeof(unsigned);
image->rowStart = new unsigned[x];
image->rowSize = new int[x];
if (image->rowStart == 0 || image->rowSize == 0) {
errstr = OUT_OF_MEMORY;
return 0;
}
image->rleEnd = 512 + (2 * x);
fseek(file, 512, SEEK_SET);
fread(image->rowStart, 1, x, file);
fread(image->rowSize, 1, x, file);
if (swapFlag) {
ConvertUint(image->rowStart, x/(int) sizeof(unsigned));
ConvertUint((unsigned *)image->rowSize, x/(int) sizeof(int));
}
}
return image;
}
void
SGTexture::ImageGetRow(SGTexture::ImageRec *image, GLubyte *buf, int y, int z) {
GLubyte *iPtr, *oPtr, pixel;
int count;
if ((image->type & 0xFF00) == 0x0100) {
gzseek(image->file, (long) image->rowStart[y+z*image->ysize], SEEK_SET);
int size = image->rowSize[y+z*image->ysize];
gzread(image->file, image->tmp, size);
iPtr = image->tmp;
oPtr = buf;
for (GLubyte *limit = iPtr + size; iPtr < limit;) {
pixel = *iPtr++;
count = (int)(pixel & 0x7F);
if (!count) {
errstr = WRONG_COUNT;
return;
}
if (pixel & 0x80) {
while (iPtr < limit && count--) {
*oPtr++ = *iPtr++;
}
} else if (iPtr < limit) {
pixel = *iPtr++;
while (count--) {
*oPtr++ = pixel;
}
}
}
} else {
gzseek(image->file, 512+(y*image->xsize)+(z*image->xsize*image->ysize),
SEEK_SET);
gzread(image->file, buf, image->xsize);
}
}
void
SGTexture::ImagePutRow(SGTexture::ImageRec *image, GLubyte *buf, int y, int z) {
GLubyte *iPtr, *oPtr, pixel;
int count;
if ((image->type & 0xFF00) == 0x0100) {
fseek(file, (long) image->rowStart[y+z*image->ysize], SEEK_SET);
fread( image->tmp, 1, (unsigned int)image->rowSize[y+z*image->ysize],
file);
iPtr = image->tmp;
oPtr = buf;
for (;;) {
pixel = *iPtr++;
count = (int)(pixel & 0x7F);
if (!count) {
errstr = WRONG_COUNT;
return;
}
if (pixel & 0x80) {
while (count--) {
*oPtr++ = *iPtr++;
}
} else {
pixel = *iPtr++;
while (count--) {
*oPtr++ = pixel;
}
}
}
} else {
fseek(file, 512+(y*image->xsize)+(z*image->xsize*image->ysize),
SEEK_SET);
fread(buf, 1, image->xsize, file);
}
}
void
SGTexture::rgbtorgb(GLubyte *r, GLubyte *g, GLubyte *b, GLubyte *l, int n) {
while(n--) {
l[0] = r[0];
l[1] = g[0];
l[2] = b[0];
l += 3; r++; g++; b++;
}
}
void
SGTexture::rgbatorgba(GLubyte *r, GLubyte *g, GLubyte *b, GLubyte *a,
GLubyte *l, int n) {
while(n--) {
l[0] = r[0];
l[1] = g[0];
l[2] = b[0];
l[3] = a[0];
l += 4; r++; g++; b++; a++;
}
}
void
SGTexture::ConvertShort(unsigned short *array, unsigned int length) {
unsigned short b1, b2;
unsigned char *ptr;
ptr = (unsigned char *)array;
while (length--) {
b1 = *ptr++;
b2 = *ptr++;
*array++ = (b1 << 8) | (b2);
}
}
void
SGTexture::ConvertUint(unsigned *array, unsigned int length) {
unsigned int b1, b2, b3, b4;
unsigned char *ptr;
ptr = (unsigned char *)array;
while (length--) {
b1 = *ptr++;
b2 = *ptr++;
b3 = *ptr++;
b4 = *ptr++;
*array++ = (b1 << 24) | (b2 << 16) | (b3 << 8) | (b4);
}
}
void
SGTexture::make_monochrome(float contrast, GLubyte r, GLubyte g, GLubyte b) {
if (num_colors >= 3)
return;
GLubyte ap[3];
for (int y=0; y<texture_height; y++)
for (int x=0; x<texture_width; x++)
{
GLubyte *rgb = get_pixel(x,y);
GLubyte avg = (rgb[0] + rgb[1] + rgb[2]) / 3;
if (contrast != 1.0) {
float pixcol = -1.0 + (avg/128);
avg = 128 + int(128*pow(pixcol, contrast));
}
ap[0] = avg*r/255;
ap[1] = avg*g/255;
ap[2] = avg*b/255;
set_pixel(x,y,ap);
}
}
void
SGTexture::make_grayscale(float contrast) {
if (num_colors < 3)
return;
int colors = (num_colors == 3) ? 1 : 2;
GLubyte *map = new GLubyte[ texture_width * texture_height * colors ];
for (int y=0; y<texture_height; y++)
for (int x=0; x<texture_width; x++)
{
GLubyte *rgb = get_pixel(x,y);
GLubyte avg = (rgb[0] + rgb[1] + rgb[2]) / 3;
if (contrast != 1.0) {
float pixcol = -1.0 + (avg/128);
avg = 128 + int(128*pow(pixcol, contrast));
}
int pos = (x + y*texture_width)*colors;
map[pos] = avg;
if (colors > 1)
map[pos+1] = rgb[3];
}
delete[] texture_data;
texture_data = map;
num_colors = colors;
}
void
SGTexture::make_maxcolorwindow() {
GLubyte minmaxc[2] = {255, 0};
int pos = 0;
int max = num_colors;
if (num_colors == 2) max = 1;
if (num_colors == 4) max = 3;
while (pos < texture_width * texture_height * num_colors) {
for (int i=0; i < max; i++) {
GLubyte c = texture_data[pos+i];
if (c < minmaxc[0]) minmaxc[0] = c;
if (c > minmaxc[1]) minmaxc[1] = c;
}
pos += num_colors;
}
GLubyte offs = minmaxc[0];
float factor = 255.0 / float(minmaxc[1] - minmaxc[0]);
// printf("Min: %i, Max: %i, Factor: %f\n", offs, minmaxc[1], factor);
pos = 0;
while (pos < texture_width * texture_height * num_colors) {
for (int i=0; i < max; i++) {
texture_data[pos+i] -= offs;
texture_data[pos+i] = int(factor * texture_data[pos+i]);
}
pos += num_colors;
}
}
void
SGTexture::make_normalmap(float brightness, float contrast) {
make_grayscale(contrast);
make_maxcolorwindow();
int colors = (num_colors == 1) ? 3 : 4;
bool alpha = (colors > 3);
int tsize = texture_width * texture_height * colors;
GLubyte *map = new GLubyte[ tsize ];
int mpos = 0, dpos = 0;
for (int y=0; y<texture_height; y++) {
int ytw = y*texture_width;
for (int x=0; x<texture_width; x++)
{
int xp1 = (x < (texture_width-1)) ? x+1 : 0;
int yp1 = (y < (texture_height-1)) ? y+1 : 0;
int posxp1 = (xp1 + ytw)*num_colors;
int posyp1 = (x + yp1*texture_width)*num_colors;
GLubyte c = texture_data[dpos];
GLubyte cx1 = texture_data[posxp1];
GLubyte cy1 = texture_data[posyp1];
if (alpha) {
GLubyte a = texture_data[dpos+1];
GLubyte ax1 = texture_data[posxp1+1];
GLubyte ay1 = texture_data[posyp1+1];
c = (c + a)/2;
cx1 = (cx1 + ax1)/2;
cy1 = (cy1 + ay1)/2;
map[mpos+3] = a;
}
map[mpos+0] = (128+(cx1-c)/2);
map[mpos+1] = (128+(cy1-c)/2);
map[mpos+2] = 127+int(brightness*128); // 255-c/2;
mpos += colors;
dpos += num_colors;
}
}
delete[] texture_data;
texture_data = map;
num_colors = colors;
}
void
SGTexture::make_bumpmap(float brightness, float contrast) {
make_grayscale(contrast);
int colors = (num_colors == 1) ? 1 : 2;
GLubyte *map = new GLubyte[ texture_width * texture_height * colors ];
for (int y=0; y<texture_height; y++)
for (int x=0; x<texture_width; x++)
{
int mpos = (x + y*texture_width)*colors;
int dpos = (x + y*texture_width)*num_colors;
int xp1 = (x < (texture_width-1)) ? x+1 : 0;
int yp1 = (y < (texture_height-1)) ? y+1 : 0;
int posxp1 = (xp1 + y*texture_width)*num_colors;
int posyp1 = (x + yp1*texture_width)*num_colors;
map[mpos] = (127 - ((texture_data[dpos]-texture_data[posxp1]) -
((texture_data[dpos]-texture_data[posyp1]))/4))/2;
if (colors > 1)
map[mpos+1] = texture_data[dpos+1];
}
delete[] texture_data;
texture_data = map;
num_colors = colors;
}

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