hi, i would like to apply a texture to a GLUQuadric sphere i found an example int he NEHE pages : http://nehe.gamedev.net/data/lessons/le-…-?lesson=18 and from opengl red book for what concerne GLUQuadric sphere http://glprogramming.com/red/chapter11.html also i have found (because i have it) from the book Programming activity the source code on line : http://examples.oreilly.com/9780596154158/ i have tried this code , no errors in the building process but i receive an ecception in this line when i debug it: text.texData.textureTarget = GL_TEXTURE_2D; i leave the code if someone may explain what is wrong… ch13sphere .cpp:
#include "ch13_sphere.h"
//int FAN_VERTICES = 360;
void testApp::setup(){
//img.setImageType(OF_IMAGE_COLOR);
img.loadImage("cone.jpg");
text.texData.textureTarget = GL_TEXTURE_2D;
text.allocate(512, 512, GL_RGBA, false);
ang = 0;
glEnable(GL_DEPTH_TEST); // enable depth testing, otherwise things will look really werid
glDepthFunc(GL_LEQUAL); // set the type of depth testing
//glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST);
//glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);
glEnable ( GL_TEXTURE_2D );
sphere = gluNewQuadric();
glPixelStorei ( GL_UNPACK_ALIGNMENT, 1 );
gluQuadricDrawStyle( sphere, GLU_FILL);
gluQuadricNormals( sphere, GLU_SMOOTH);
gluQuadricTexture( sphere, GL_TRUE );
/********/
// new
/********/
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexEnvf(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_REPLACE);
/********/
// end new
/********/
//glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST);
//glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);
text.loadData(img.getPixels(), 512, 512, GL_RGB);
}
void testApp::update(){
ofBackground(122,122,122);
ang+=0.2;
}
void testApp::draw() {
text.loadData(img.getPixels(), 512, 512, GL_RGB);
glTranslatef(350, 250, 0);
glRotated(ang, 1.0, 0.0, 0.0);
// enable texturing
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, text.getTextureData().textureID);
//glutWireSphere(200, 30, 30);
gluSphere(sphere, 200, 30, 30);
//ofRect(200, 200, 200, 200);
glEnable(text.texData.textureTarget);
/*
GLfloat afColors[] = { 1.0f, 0.0f, 0.0f, 1.0f,
1.0f, 0.0f, 0.0f, 1.0f,
1.0f, 0.0f, 0.0f, 1.0f,
1.0f, 0.0f, 0.0f, 1.0f };
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glColorPointer(4,GL_FLOAT,0,afColors);
//glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
FAN_VERTICES = 360;
GLfloat afVertices[FAN_VERTICES*3];
GLfloat angle = 0.0f;
afVertices[0] = 0;
afVertices[1] = 0;
afVertices[2] = 0.0f;
for(int i = 3; i<(FAN_VERTICES*3); i++){
afVertices[i++] = (200*cos(angle) + 0)*1;
afVertices[i++] = 200*sin(angle) + 0;
//afVertices[i++] = 200*sin(angle) + 0;
afVertices[i] = 0.0f;
angle+=(PI/180);
}
glEnableClientState(GL_VERTEX_ARRAY);
glVertexPointer(3,GL_FLOAT,0,afVertices);
//pass the texture coordinates
GLfloat pfTexCoord[2*FAN_VERTICES];
angle = 0.0f;
pfTexCoord[0] = 0.5f;
pfTexCoord[1] = 0.5f;
for(int i=2; i<(2*FAN_VERTICES); i++){
pfTexCoord[i++] = 0.5f * cos(angle) + 0.5f;
pfTexCoord[i] = 0.5f * sin(angle) + 0.5f;
angle += (PI/180.0f);
}
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glTexCoordPointer(2,GL_FLOAT,0,pfTexCoord);
glDrawArrays(GL_TRIANGLE_FAN, 0, FAN_VERTICES);
glPopMatrix();
*/
glDisable(text.texData.textureTarget);
}
void testApp::keyPressed (int key){
}
void testApp::keyReleased (int key){
}
void testApp::mouseMoved(int x, int y ){
}
void testApp::mouseDragged(int x, int y, int button){
}
void testApp::mousePressed(int x, int y, int button){
}
void testApp::mouseReleased(){
}
and the ch13 sphere.h:
#ifndef _TEST_APP
#define _TEST_APP
#include "ofMain.h"
#include "CustomImage.h"
class testApp : public ofSimpleApp{
public:
void setup();
void update();
void draw();
void keyPressed(int key);
void keyReleased(int key);
void mouseMoved(int x, int y );
void mouseDragged(int x, int y, int button);
void mousePressed(int x, int y, int button);
void mouseReleased();
ofTexture text;
CustomImage img;
GLUquadric * sphere;
int FAN_VERTICES;
float ang;
};
#endif
there also other two file CustoImage.cpp
/*
* CustomImage.cpp
* openFrameworks
*
* Created by base on 2/9/09.
* Copyright 2009 __MyCompanyName__. All rights reserved.
*
*/
#include "CustomImage.h"
ofTexture CustomImage::getTex() {
return tex;
}
and CustomImage.h
/*
* CustomImage.h
* openFrameworks
*
* Created by base on 2/9/09.
* Copyright 2009 __MyCompanyName__. All rights reserved.
*
*/
#include "ofImage.h"
class CustomImage : public ofImage {
public:
ofTexture getTex();
};
I spent hours trying the code then one minute later my post i try again in the debug and then in the release mode and now it work! probably the reason was in the debugging process. The code work good as it is. You can try if you want…