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971 lines
23 KiB
971 lines
23 KiB
/*
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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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* $Id$
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*/
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#include <simgear/compiler.h>
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#ifdef WIN32
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# include <windows.h>
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#endif
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#include <osg/Matrixf>
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#include <math.h>
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#include <zlib.h>
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#include "texture.hxx"
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#include "colours.h"
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const char *FILE_OPEN_ERROR = "Unable to open file.";
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const char *WRONG_COUNT = "Unsupported number of color channels.";
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const char *NO_TEXTURE = "No texture data resident.";
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const char *OUT_OF_MEMORY = "Out of memory.";
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SGTexture::SGTexture()
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: texture_id(0),
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texture_data(0),
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num_colors(3),
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file(0)
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{
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}
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SGTexture::SGTexture(unsigned int width, unsigned int height)
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: texture_id(0),
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errstr("")
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{
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texture_data = new GLubyte[ width * height * 3 ];
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}
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SGTexture::~SGTexture()
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{
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delete[] texture_data;
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if ( texture_id != 0 ) {
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free_id();
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}
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}
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void
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SGTexture::bind()
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{
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bool gen = false;
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if (!texture_id) {
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#ifdef GL_VERSION_1_1
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glGenTextures(1, &texture_id);
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#elif GL_EXT_texture_object
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glGenTexturesEXT(1, &texture_id);
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#endif
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gen = true;
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}
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#ifdef GL_VERSION_1_1
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glBindTexture(GL_TEXTURE_2D, texture_id);
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#elif GL_EXT_texture_object
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glBindTextureEXT(GL_TEXTURE_2D, texture_id);
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#endif
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if (gen) {
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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}
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}
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/**
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* A function to resize the OpenGL window which will be used by
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* the dynamic texture generating routines.
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*
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* @param width The width of the new window
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* @param height The height of the new window
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*/
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void
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SGTexture::resize(unsigned int width, unsigned int height)
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{
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using namespace osg;
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GLfloat aspect;
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// Make sure that we don't get a divide by zero exception
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if (height == 0)
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height = 1;
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// Set the viewport for the OpenGL window
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glViewport(0, 0, width, height);
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// Calculate the aspect ratio of the window
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aspect = width/height;
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// Go to the projection matrix, this gets modified by the perspective
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// calulations
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glMatrixMode(GL_PROJECTION);
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// Do the perspective calculations
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Matrixf proj = Matrixf::perspective(45.0, aspect, 1.0, 400.0);
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glLoadMatrix(proj.ptr());
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// Return to the modelview matrix
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glMatrixMode(GL_MODELVIEW);
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}
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/**
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* A function to prepare the OpenGL state machine for dynamic
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* texture generation.
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*
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* @param width The width of the texture
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* @param height The height of the texture
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*/
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void
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SGTexture::prepare(unsigned int width, unsigned int height) {
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texture_width = width;
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texture_height = height;
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// Resize the OpenGL window to the size of our dynamic texture
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resize(texture_width, texture_height);
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glClearColor(0.0, 0.0, 0.0, 1.0);
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}
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/**
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* A function to generate the dynamic texture.
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*
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* The actual texture can be accessed by calling get_texture()
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*
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* @param width The width of the previous OpenGL window
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* @param height The height of the previous OpenGL window
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*/
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void
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SGTexture::finish(unsigned int width, unsigned int height) {
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// If a texture hasn't been created then it gets created, and the contents
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// of the frame buffer gets copied into it. If the texture has already been
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// created then its contents just get updated.
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bind();
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if (!texture_data)
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{
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// Copies the contents of the frame buffer into the texture
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glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 0, 0,
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texture_width, texture_height, 0);
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} else {
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// Copies the contents of the frame buffer into the texture
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glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0,
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texture_width, texture_height);
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}
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// Set the OpenGL window back to its previous size
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resize(width, height);
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// Clear the window back to black
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glClearColor(0.0, 0.0, 0.0, 1.0);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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}
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void
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SGTexture::read_alpha_texture(const char *name)
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{
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GLubyte *lptr;
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SGTexture::ImageRec *image;
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int y;
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delete[] texture_data;
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image = ImageOpen(name);
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if(!image) {
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errstr = FILE_OPEN_ERROR;
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return;
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}
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texture_width = image->xsize;
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texture_height = image->ysize;
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// printf("image->zsize = %d\n", image->zsize);
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if (image->zsize != 1) {
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ImageClose(image);
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errstr = WRONG_COUNT;
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return;
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}
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texture_data = new GLubyte[ image->xsize * image->ysize ];
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num_colors = 1;
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if (!texture_data) {
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errstr = NO_TEXTURE;
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return;
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}
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lptr = texture_data;
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for(y=0; y<image->ysize; y++) {
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ImageGetRow(image,lptr,y,0);
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lptr += image->xsize;
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}
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ImageClose(image);
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}
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void
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SGTexture::read_rgb_texture(const char *name)
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{
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GLubyte *ptr;
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GLubyte *rbuf, *gbuf, *bbuf;
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SGTexture::ImageRec *image;
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int y;
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delete[] texture_data;
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image = ImageOpen(name);
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if(!image) {
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errstr = FILE_OPEN_ERROR;
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return;
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}
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texture_width = image->xsize;
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texture_height = image->ysize;
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if (image->zsize < 1 || image->zsize > 4) {
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ImageClose(image);
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errstr = WRONG_COUNT;
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return;
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}
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num_colors = 3;
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texture_data = new GLubyte[ image->xsize * image->ysize * num_colors ];
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rbuf = new GLubyte[ image->xsize ];
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gbuf = new GLubyte[ image->xsize ];
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bbuf = new GLubyte[ image->xsize ];
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if(!texture_data || !rbuf || !gbuf || !bbuf) {
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delete[] texture_data;
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delete[] rbuf;
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delete[] gbuf;
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delete[] bbuf;
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errstr = OUT_OF_MEMORY;
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return;
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}
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ptr = texture_data;
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for(y=0; y<image->ysize; y++) {
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if(image->zsize == 4 || image->zsize == 3) {
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ImageGetRow(image,rbuf,y,0);
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ImageGetRow(image,gbuf,y,1);
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ImageGetRow(image,bbuf,y,2);
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} else {
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ImageGetRow(image,rbuf,y,0);
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memcpy(gbuf,rbuf,image->xsize);
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memcpy(bbuf,rbuf,image->xsize);
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}
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rgbtorgb(rbuf,gbuf,bbuf,ptr,image->xsize);
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ptr += (image->xsize * num_colors);
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}
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ImageClose(image);
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delete[] rbuf;
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delete[] gbuf;
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delete[] bbuf;
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}
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void
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SGTexture::read_rgba_texture(const char *name)
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{
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GLubyte *ptr;
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GLubyte *rbuf, *gbuf, *bbuf, *abuf;
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SGTexture::ImageRec *image;
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int y;
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delete[] texture_data;
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image = ImageOpen(name);
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if(!image) {
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errstr = FILE_OPEN_ERROR;
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return;
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}
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texture_width = image->xsize;
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texture_height = image->ysize;
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if (image->zsize < 1 || image->zsize > 4) {
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ImageClose(image);
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errstr = WRONG_COUNT;
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return;
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}
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num_colors = 4;
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texture_data = new GLubyte[ image->xsize * image->ysize * num_colors ];
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rbuf = new GLubyte[ image->xsize ];
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gbuf = new GLubyte[ image->xsize ];
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bbuf = new GLubyte[ image->xsize ];
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abuf = new GLubyte[ image->xsize ];
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if(!texture_data || !rbuf || !gbuf || !bbuf || !abuf) {
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delete[] texture_data;
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delete[] rbuf;
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delete[] gbuf;
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delete[] bbuf;
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delete[] abuf;
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errstr = OUT_OF_MEMORY;
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return;
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}
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ptr = texture_data;
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for(y=0; y<image->ysize; y++) {
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if(image->zsize == 4) {
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ImageGetRow(image,rbuf,y,0);
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ImageGetRow(image,gbuf,y,1);
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ImageGetRow(image,bbuf,y,2);
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ImageGetRow(image,abuf,y,3);
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} else if(image->zsize == 3) {
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ImageGetRow(image,rbuf,y,0);
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ImageGetRow(image,gbuf,y,1);
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ImageGetRow(image,bbuf,y,2);
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memset(abuf, 255, image->xsize);
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} else if(image->zsize == 2) {
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ImageGetRow(image,rbuf,y,0);
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memcpy(gbuf,rbuf,image->xsize);
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memcpy(bbuf,rbuf,image->xsize);
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ImageGetRow(image,abuf,y,1);
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} else {
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ImageGetRow(image,rbuf,y,0);
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memcpy(gbuf,rbuf,image->xsize);
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memcpy(bbuf,rbuf,image->xsize);
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memset(abuf, 255, image->xsize);
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}
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rgbatorgba(rbuf,gbuf,bbuf,abuf,ptr,image->xsize);
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ptr += (image->xsize * num_colors);
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}
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ImageClose(image);
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delete[] rbuf;
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delete[] gbuf;
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delete[] bbuf;
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delete[] abuf;
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}
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void
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SGTexture::read_raw_texture(const char *name)
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{
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GLubyte *ptr;
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SGTexture::ImageRec *image;
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int y;
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delete[] texture_data;
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image = RawImageOpen(name);
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if(!image) {
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errstr = FILE_OPEN_ERROR;
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return;
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}
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texture_width = 256;
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texture_height = 256;
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texture_data = new GLubyte[ 256 * 256 * 3 ];
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if(!texture_data) {
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errstr = OUT_OF_MEMORY;
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return;
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}
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ptr = texture_data;
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for(y=0; y<256; y++) {
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gzread(image->file, ptr, 256*3);
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ptr+=256*3;
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}
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ImageClose(image);
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}
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void
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SGTexture::read_r8_texture(const char *name)
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{
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unsigned char c[1];
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GLubyte *ptr;
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SGTexture::ImageRec *image;
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int xy;
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delete[] texture_data;
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//it wouldn't make sense to write a new function ...
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image = RawImageOpen(name);
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if(!image) {
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errstr = FILE_OPEN_ERROR;
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return;
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}
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texture_width = 256;
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texture_height = 256;
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texture_data = new GLubyte [ 256 * 256 * 3 ];
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if(!texture_data) {
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errstr = OUT_OF_MEMORY;
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return;
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}
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ptr = texture_data;
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for(xy=0; xy<(256*256); xy++) {
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gzread(image->file, c, 1);
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//look in the table for the right colours
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ptr[0]=msfs_colour[c[0]][0];
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ptr[1]=msfs_colour[c[0]][1];
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ptr[2]=msfs_colour[c[0]][2];
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ptr+=3;
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}
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ImageClose(image);
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}
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void
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SGTexture::write_texture(const char *name) {
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SGTexture::ImageRec *image = ImageWriteOpen(name);
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printf("colors: %i, height: %i, width: %i\n", num_colors, texture_height, texture_width);
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for (int c=0; c<num_colors; c++) {
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GLubyte *ptr = texture_data + c;
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for (int y=0; y<texture_height; y++) {
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for (int x=0; x<texture_width; x++) {
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image->tmp[x]=*ptr;
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ptr = ptr + num_colors;
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}
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fwrite(image->tmp, 1, texture_width, file);
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}
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}
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ImageClose(image);
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}
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void
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SGTexture::set_pixel(GLuint x, GLuint y, GLubyte *c)
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{
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if (!texture_data) {
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errstr = NO_TEXTURE;
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return;
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}
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unsigned int pos = (x + y*texture_width) * num_colors;
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memcpy(texture_data+pos, c, num_colors);
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}
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GLubyte *
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SGTexture::get_pixel(GLuint x, GLuint y)
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{
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static GLubyte c[4] = {0, 0, 0, 0};
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if (!texture_data) {
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errstr = NO_TEXTURE;
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return c;
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}
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unsigned int pos = (x + y*texture_width)*num_colors;
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memcpy(c, texture_data + pos, num_colors);
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return c;
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}
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SGTexture::ImageRec *
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SGTexture::ImageOpen(const char *fileName)
|
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{
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union {
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int testWord;
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char testByte[4];
|
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} endianTest;
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SGTexture::ImageRec *image;
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int swapFlag;
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int x;
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endianTest.testWord = 1;
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if (endianTest.testByte[0] == 1) {
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swapFlag = 1;
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} else {
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swapFlag = 0;
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}
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image = new SGTexture::ImageRec;
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memset(image, 0, sizeof(SGTexture::ImageRec));
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if (image == 0) {
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errstr = OUT_OF_MEMORY;
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return 0;
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}
|
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if ((image->file = gzopen(fileName, "rb")) == 0) {
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errstr = FILE_OPEN_ERROR;
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return 0;
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}
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gzread(image->file, image, 12);
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if (swapFlag) {
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ConvertShort(&image->imagic, 6);
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}
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image->tmp = new GLubyte[ image->xsize * 256 ];
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if (image->tmp == 0) {
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errstr = OUT_OF_MEMORY;
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return 0;
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}
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|
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if ((image->type & 0xFF00) == 0x0100) {
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x = image->ysize * image->zsize * (int) sizeof(unsigned);
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image->rowStart = new unsigned[x];
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image->rowSize = new int[x];
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if (image->rowStart == 0 || image->rowSize == 0) {
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errstr = OUT_OF_MEMORY;
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return 0;
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}
|
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image->rleEnd = 512 + (2 * x);
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gzseek(image->file, 512, SEEK_SET);
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gzread(image->file, image->rowStart, x);
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gzread(image->file, image->rowSize, x);
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if (swapFlag) {
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ConvertUint(image->rowStart, x/(int) sizeof(unsigned));
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ConvertUint((unsigned *)image->rowSize, x/(int) sizeof(int));
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}
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}
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return image;
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}
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void
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SGTexture::ImageClose(SGTexture::ImageRec *image) {
|
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if (image->file) gzclose(image->file);
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if (file) fclose(file);
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delete[] image->tmp;
|
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delete[] image->rowStart;
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delete[] image->rowSize;
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delete image;
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}
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|
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SGTexture::ImageRec *
|
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SGTexture::RawImageOpen(const char *fileName)
|
|
{
|
|
union {
|
|
int testWord;
|
|
char testByte[4];
|
|
} endianTest;
|
|
|
|
SGTexture::ImageRec *image;
|
|
int swapFlag;
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|
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endianTest.testWord = 1;
|
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if (endianTest.testByte[0] == 1) {
|
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swapFlag = 1;
|
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} else {
|
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swapFlag = 0;
|
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}
|
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|
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image = new SGTexture::ImageRec;
|
|
memset(image, 0, sizeof(SGTexture::ImageRec));
|
|
if (image == 0) {
|
|
errstr = OUT_OF_MEMORY;
|
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return 0;
|
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}
|
|
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;
|
|
float fx,fy;
|
|
|
|
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;
|
|
}
|
|
|
|
fx = asin((c/256.0-cx1/256.0))/1.57079633;
|
|
fy = asin((cy1/256.0-c/256.0))/1.57079633;
|
|
|
|
map[mpos+0] = (GLuint)(fx*256.0)-128;
|
|
map[mpos+1] = (GLuint)(fy*256.0)-128;
|
|
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;
|
|
}
|
|
|