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MyTex:=TTextur.Create('terrain1.jpg');
MyTex.Bind;

    glBegin(gl_Quads);
        glColor4f(1,1,1,1);
        glTexCoord2f(0,0);
        glVertex3f(-1,-1,0);

        glColor4f(1,1,1,0);
        glTexCoord2f(1,0);
        glVertex3f(1,-1,0);
        glTexCoord2f(1,1);
        glvertex3f(1,1,0);

        glColor4f(1,1,1,1);
        glTexCoord2f(0,1);
        glvertex3f(-1,1,0);
    glEnd;

    glEnable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA,GL_ONE);

MyTex:=TTextur.Create('terrain2.jpg');
MyTex.Bind;

    glBegin(gl_Quads);
        glColor4f(1,1,1,0);
        glTexCoord2f(0,0);
        glVertex3f(-1,-1,0);

        glColor4f(1,1,1,1);
        glTexCoord2f(1,0);
        glVertex3f(1,-1,0);
        glTexCoord2f(1,1);
        glvertex3f(1,1,0);

        glColor4f(1,1,1,0);
        glTexCoord2f(0,1);
        glvertex3f(-1,1,0);
    glEnd;