Simple Texture Mapping

OpenGL OpenGL: Basic Coding
1

Hi,

I am trying to apply a simple color map to a side of the cube in my program, but the side appears white. Here is my code:

GLuint textureObject[NUM_TEXS];
void InitTextures ()
{
    glEnable(GL_TEXTURE_2D);
    GLuint textureObject[NUM_TEXS];
    glGenTextures(3,textureObject);
    glActiveTexture(GL_TEXTURE0);
    Image2D_t* colIm=LoadImage("../data/color.png",false,RGB_IMAGE);
  
    glBindTexture(GL_TEXTURE_2D,textureObject[COLOR_TEX]);
    int err=TexImage(colIm);
    printf("Error: %d
", err);
}

void DrawWall (Side_t w)
{
            glEnable(GL_TEXTURE_2D);
            glBindTexture(GL_TEXTURE_2D,textureObject[COLOR_TEX]);

		glBegin(GL_QUADS);
                glTexCoord2f (0.0, 0.0);
		glVertex3fv(Wall[w].corner[0]);
		glTexCoord2f (1.0, 0.0);
        	glVertex3fv(Wall[w].corner[1]);
		glTexCoord2f (1.0, 1.0);
		glVertex3fv(Wall[w].corner[2]);
		glTexCoord2f (0.0, 1.0);	
		glVertex3fv(Wall[w].corner[3]);
		glEnd();
	
	    glDisable(GL_TEXTURE_2D);
}

The user-defined functions are working properly I used, but somehow I am not getting any textures. Any suggestions?

2

By default 2d texture need mipmaps, so check if your TexImage function does mipmaps.
Or use min filter GL_LINEAR, but it is ugly and slower.

3

Hi!
I’ve the same probleme (http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=271210#Post271210) I tried with GL_LINEAR but nothing changed… maybe our issues are related?
thanks
JLM

4

elasolova, I see nothing wrong in your code except for the glGenTextures call with “3” hard coded whereas everywhere else you are using NUM_TEXS. The gl code is incomplete, please post the content of the TexImage function.