rendering textures in oop structure - HELP!!

If you are sure that the code is right, i would check that you have created the GL context before creating textures. Offhand this is a probable cause. Otherwise post some code for us to look at.

Thanks,

again, this may make me look really stupid, i am using GLUT, and there does not seem to be any reference to a GL context, what line or lines should i expect to see in this programme?

Steven
SurreySnYder

Its a different story with glut, as long as you are loading after glutInit (edit: and set the callbacks) you should be fine. I recommend that you post some code. Other thing you could be missing - glEnable(GL_TEXTURE_2D);

This is the code i am using in the object, it uses the NEHE TGA loader, although i have used a number of other loaders.

#include "drawText.h"

int drawText::LoadGLTextures() // Load Bitmaps And Convert To Textures
{

int Status=FALSE; // Status Indicator

// Load The Bitmap, Check For Errors.
if (LoadTGA(&textures[0], "Text/WhiteONBlue/UpperA.tga"))
{
Status=TRUE; // Set The Status To TRUE
cout << "LOADED" << endl;
for (int loop=0; loop<1; loop++) // Loop Through Both Textures
{
// Typical Texture Generation Using Data From The TGA ( CHANGE )
glGenTextures(1, &textures[loop].texID); // Create The Texture ( CHANGE )
glBindTexture(GL_TEXTURE_2D, textures[loop].texID);
glTexImage2D(GL_TEXTURE_2D, 0, 3, textures[loop].width, textures[loop].height, 0, GL_RGBA, GL_UNSIGNED_BYTE, textures[loop].imageData);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);

if (textures[loop].imageData) // If Texture Image Exists ( CHANGE )
{
free(textures[loop].imageData); // Free The Texture Image Memory ( CHANGE )
}
}
}

return Status; // Return The Status
}

drawText::drawText(){

LoadGLTextures();

}

drawText::~drawText(){

}

void drawText::drawTheText(string theText){
if(theText != ""){
for(int i = 0; i< theText.length();i++){
if(theText.substr(i,1) == "A")
drawUA();
if(theText.substr(i,1) == "B")
drawUB();
if(theText.substr(i,1) == "C")
drawUC();
}
}
}

void drawText::drawUA(){



glBindTexture ( GL_TEXTURE_2D, textures[0].texID);
//cout << glGetError() << endl;
glBegin ( GL_QUADS );
glTexCoord2f(0.0f, 0.0f); glVertex3f(0.0f, 0.0f, 0.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f(0.609375f, 0.0f, 0.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f(0.609375f, 1.0f, 0.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f(0.0f, 1.0f, 0.0f);
glEnd();
glTranslatef(0.609375f, 0.0f, 0.0f);




}

void drawText::drawUB(){



glBindTexture ( GL_TEXTURE_2D, textures[0].texID );
glBegin ( GL_QUADS );
glTexCoord2f(0.0f, 0.0f); glVertex3f( 0.0f, 0.0f, 0.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f( 0.515625f, 0.0f, 0.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f( 0.515625f, 1.0f, 0.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f( 0.0f, 1.0f, 0.0f);
glEnd();
glTranslatef(0.515625f, 0.0f, 0.0f);



}

void drawText::drawUC(){



glBindTexture ( GL_TEXTURE_2D, textures[0].texID );
glBegin ( GL_QUADS );
glTexCoord2f(0.0f, 0.0f); glVertex3f( 0.0f, 0.0f, 0.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f( 0.5625f, 0.0f, 0.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f( 0.5625f, 1.0f, 0.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f( 0.0f, 1.0f, 0.0f);
glEnd();
glTranslatef(0.5625f, 0.0f, 0.0f);



}

It does occur to me that you're not checking many return values. And did you call glEnable(GL_TEXTURE_2D) elsewhere as lubby mentioned?

Thanks for your help, i have solved the problem, the textures were being created in the constructor, and not after the glut window has been created, have solved this stupid problem now! only 3 days wasted!!!

thanks for your speedy help!

steven
SurreySnYder