openGL: texture and triangle not rendering - opengl

Question

If i comment out DrawGLScene(), i see a large shaded triangle, if I comment out drawtri() i see a square texture drawn. But I am not able to combine both - when both func's are called, I see only triangle outline and the texture is rendered with a strong red filter applied.
What could be the problem?
void DrawGLScene()
{
int x, y;
float float_x, float_y, float_xb, float_yb;
float x0=0,y0=0,x1=10,y1=10,z=-3;
// glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear The Screen And The Depth Buffer
glEnable(GL_TEXTURE_2D);
glLoadIdentity(); // Reset The View
glTranslatef(0.0f,0.0f,-12.0f); // move 12 units into the screen.
glBindTexture(GL_TEXTURE_2D, texture[0]); // choose the texture to use.
glPolygonMode(GL_BACK, GL_FILL);
glPolygonMode(GL_FRONT, GL_LINE);
glBegin(GL_QUADS);
glTexCoord2f( 0,0);
glVertex3f( x0, y0, z );
glTexCoord2f( 0, 1 );
glVertex3f( x0, y1, z );
glTexCoord2f( 1, 1);
glVertex3f( x1, y1, z );
glTexCoord2f( 1, 0 );
glVertex3f( x1, y0,z );
glEnd();
glDisable(GL_TEXTURE_2D);
// since this is double buffered, swap the buffers to display what just got drawn.
// glutSwapBuffers();
}
void drawtri() {
glBegin(GL_TRIANGLES);
glColor3f(0.0f,0.0f,1.0f);
glVertex3f( 0.0f, 1.0f, 0.0f);
glColor3f(0.0f,1.0f,0.0f);
glVertex3f(-1.0f,-1.0f, 0.0f);
glColor3f(1.0f,0.0f,0.0f);
glVertex3f( 1.0f,-1.0f, 0.0f);
glEnd();
}
void zdisplay()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear Screen and Depth Buffer
glLoadIdentity();
glTranslatef(0.0f,0.0f,-3.0f);
//drawtri();
DrawGLScene();
glutSwapBuffers();
}

Answer 1

The red filter is caused by the applied color:
glColor3f(0.0f,0.0f,1.0f);
Reset the color to white before drawing the quad:
glColor3f(1.0f,1.0f,1.0f);
The outline is caused by the following specification:
glPolygonMode(GL_FRONT, GL_LINE);
Specify fill mode:
glPolygonMode(GL_FRONT, GL_FILL);

Answer 2

When calling both functions, did you actually call the methods in the order in which the code shows them? Because I suspect that the order was reversed. If I'm right, I think you must reset the glPolygonMode when drawing the triangle. Try adding glPolygonMode(GL_FRONT_AND_BACK, GL_FILL) before the call to glBegin(GL_TRIANGLES).