Legacy OpenGL texturing cube

Question

I am trying to texture a cuboid in legacy OpenGL. No matter which side of the cuboid I render first, this side is not textured correctly where as all other sides are textured correctly. I have tried rendering different sides of the cube first.

This is the code that draws the cube including it's texture coordinates:

void Objects::cuboidTextured(float width, float height, float depth, float xpos, float ypos, float zpos, float r, float g, float b){
    glMatrixMode(GL_MODELVIEW);

    glPushMatrix();
    glTranslatef(xpos, ypos, zpos);

    glColor3f(r, g, b);

    glBegin(GL_QUADS);
    glVertex3f(  width, -height, depth );
    glTexCoord2f(1,0);
    glVertex3f(  width,  height, depth );
    glTexCoord2f(1,1);
    glVertex3f( -width,  height, depth );
    glTexCoord2f(0,1);
    glVertex3f( -width, -height, depth );
    glTexCoord2f(0,0);
    glEnd();

    glBegin(GL_QUADS);
    glVertex3f( width, -height, -depth );
    glTexCoord2f(1,0);
    glVertex3f( width,  height, -depth );
    glTexCoord2f(1,1);
    glVertex3f( width,  height,  depth );
    glTexCoord2f(0,1);
    glVertex3f( width, -height,  depth );
    glTexCoord2f(0,0);
    glEnd();

    glBegin(GL_QUADS);
    glVertex3f( -width, -height, depth );
    glTexCoord2f(1,0);
    glVertex3f( -width,  height, depth );
    glTexCoord2f(1,1);
    glVertex3f( -width,  height, -depth );
    glTexCoord2f(0,1);
    glVertex3f( -width, -height, -depth );
    glTexCoord2f(0,0);
    glEnd();

    glBegin(GL_QUADS);
    glVertex3f(  width,  height,  depth );
    glTexCoord2f(1,0);
    glVertex3f(  width,  height, -depth );
    glTexCoord2f(1,1);
    glVertex3f( -width,  height, -depth );
    glTexCoord2f(0,1);
    glVertex3f( -width,  height,  depth );
    glTexCoord2f(0,0);
    glEnd();

    glBegin(GL_QUADS);
    glVertex3f(  width, -height, -depth );
    glTexCoord2f(0,1);
    glVertex3f(  width, -height,  depth );
    glTexCoord2f(0,0);
    glVertex3f( -width, -height,  depth );
    glTexCoord2f(1,1);
    glVertex3f( -width, -height, -depth );
    glTexCoord2f(1,0);
    glEnd();

    glBegin(GL_QUADS);
    glVertex3f( -width, -height, -depth);       
    glTexCoord2f(1,0);
    glVertex3f( -width,  height, -depth);      
    glTexCoord2f(1,1);
    glVertex3f(  width,  height, -depth);      
    glTexCoord2f(0,1);
    glVertex3f(  width, -height, -depth); 
    glTexCoord2f(0,0);
    glEnd();

    glPopMatrix();
}

genpfault genpfault · Accepted Answer · 2018-12-20T15:21:18

You're doing it backwards, calling glVertex() before glTexCoord().

glVertex:

glVertex commands are used within glBegin/glEnd pairs to specify point, line, and polygon vertices. The current color, normal, texture coordinates, and fog coordinate are associated with the vertex when glVertex is called.

So, set all your vertex state by glTexCoord() and friends, then call glVertex():

glBegin(GL_QUADS);
glTexCoord2f(1,0);
glVertex3f( width, -height, -depth );
glTexCoord2f(1,1);
glVertex3f( width,  height, -depth );
glTexCoord2f(0,1);
glVertex3f( width,  height,  depth );
glTexCoord2f(0,0);
glVertex3f( width, -height,  depth );
glEnd();

Otherwise glVertex() will use whatever random texture coordinate was last set.

Legacy OpenGL texturing cube

1 Answers