Cómo aplicar textura a glutSolidCube

Question

Puedo encontrar tutoriales sobre el mapeo de texturas a polígonos especificando vértices, etc. pero nada sobre cómo aplicar una textura a un cubo (u otro material) dibujado con exceso (glutSolidCube).

que estoy haciendo algo como:

glTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, decal); 
glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, repeat); 
glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, repeat); 
glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, nearest); 
glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, nearest); 

glPixelStorei(GL_UNPACK_ALIGNMENT, 1); 
glTexImage2D(GL_TEXTURE_2D, 0, 4, myImageWidth, myImageHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, (GLvoid *)myImage); 

//... 

glEnable(GL_TEXTURE_2D); 

//now draw the cube 
glutSolidCube(N); 

Hacer esto me da la textura de aplicar al cubo, pero todo el cubo obtiene el color del primer byte en la textura!

¿Hay alguna forma de correlacionar una textura con un cubo sólido (y otros sólidos) cuando se utiliza glutSolidCube?

Answer 1

No, ya que glutSolidCube() no genera coordenadas de textura. Afortunadamente, sin embargo, glutSolidCube() es fácil de implementar y agrega coordenadas de textura. Aquí está el código fuente para glutSolidCube() y asociados funciones, desde http://www.opengl.org/resources/libraries/glut/:

/* Copyright (c) Mark J. Kilgard, 1994, 1997. */ 

/**                    
(c) Copyright 1993, Silicon Graphics, Inc.          

ALL RIGHTS RESERVED                

Permission to use, copy, modify, and distribute this software     
for any purpose and without fee is hereby granted, provided      
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written prior permission. 

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"AS-IS" AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR 
OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF 
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. IN NO 
EVENT SHALL SILICON GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE 
ELSE FOR ANY DIRECT, SPECIAL, INCIDENTAL, INDIRECT OR 
CONSEQUENTIAL DAMAGES OF ANY KIND, OR ANY DAMAGES WHATSOEVER, 
INCLUDING WITHOUT LIMITATION, LOSS OF PROFIT, LOSS OF USE, 
SAVINGS OR REVENUE, OR THE CLAIMS OF THIRD PARTIES, WHETHER OR 
NOT SILICON GRAPHICS, INC. HAS BEEN ADVISED OF THE POSSIBILITY 
OF SUCH LOSS, HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
ARISING OUT OF OR IN CONNECTION WITH THE POSSESSION, USE OR 
PERFORMANCE OF THIS SOFTWARE. 

US Government Users Restricted Rights 

Use, duplication, or disclosure by the Government is subject to 
restrictions set forth in FAR 52.227.19(c)(2) or subparagraph 
(c)(1)(ii) of the Rights in Technical Data and Computer 
Software clause at DFARS 252.227-7013 and/or in similar or 
successor clauses in the FAR or the DOD or NASA FAR 
Supplement. Unpublished-- rights reserved under the copyright 
laws of the United States. Contractor/manufacturer is Silicon 
Graphics, Inc., 2011 N. Shoreline Blvd., Mountain View, CA 
94039-7311. 

OpenGL(TM) is a trademark of Silicon Graphics, Inc. 
*/ 

static void 
drawBox(GLfloat size, GLenum type) 
{ 
    static GLfloat n[6][3] = 
    { 
    {-1.0, 0.0, 0.0}, 
    {0.0, 1.0, 0.0}, 
    {1.0, 0.0, 0.0}, 
    {0.0, -1.0, 0.0}, 
    {0.0, 0.0, 1.0}, 
    {0.0, 0.0, -1.0} 
    }; 
    static GLint faces[6][4] = 
    { 
    {0, 1, 2, 3}, 
    {3, 2, 6, 7}, 
    {7, 6, 5, 4}, 
    {4, 5, 1, 0}, 
    {5, 6, 2, 1}, 
    {7, 4, 0, 3} 
    }; 
    GLfloat v[8][3]; 
    GLint i; 

    v[0][0] = v[1][0] = v[2][0] = v[3][0] = -size/2; 
    v[4][0] = v[5][0] = v[6][0] = v[7][0] = size/2; 
    v[0][1] = v[1][1] = v[4][1] = v[5][1] = -size/2; 
    v[2][1] = v[3][1] = v[6][1] = v[7][1] = size/2; 
    v[0][2] = v[3][2] = v[4][2] = v[7][2] = -size/2; 
    v[1][2] = v[2][2] = v[5][2] = v[6][2] = size/2; 

    for (i = 5; i >= 0; i--) { 
    glBegin(type); 
    glNormal3fv(&n[i][0]); 
    glVertex3fv(&v[faces[i][0]][0]); 
    glVertex3fv(&v[faces[i][1]][0]); 
    glVertex3fv(&v[faces[i][2]][0]); 
    glVertex3fv(&v[faces[i][3]][0]); 
    glEnd(); 
    } 
} 

void APIENTRY 
glutSolidCube(GLdouble size) 
{ 
    drawBox(size, GL_QUADS); 
} 

Sólo añadir en algunas llamadas a la glTexCoord* familia de funciones. NeHe tiene un buen tutorial sobre cómo comenzar con la asignación de texturas con OpenGL.

Answer 2

Según la GLUT API documentation:

[glutSolidCube genera] normales apropiados para la iluminación pero no generan coordenadas de textura (a excepción de la tetera).

Answer 3

En realidad hay una solución ...

puede utilizar generar textura coordenadas como este

glEnable(GL_TEXTURE_GEN_S); //enable texture coordinate generation 
    glEnable(GL_TEXTURE_GEN_T); 
    glBindTexture(GL_TEXTURE_2D, theTexture[2]); 
    glutSolidCube(2); 
    glDisable(GL_TEXTURE_GEN_S); //enable texture coordinate generation 
    glDisable(GL_TEXTURE_GEN_T);