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POCompiling and runnin OpenGL (glut) program in ubuntu 10.10
 

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  1. POCompiling and runnin OpenGL (glut) program in ubuntu 10.10
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    <p>I wrote this code:</p> <pre><code>#include &lt;stdio.h&gt; #include &lt;stdlib.h&gt; #include &lt;GL/glx.h&gt; #include &lt;GL/gl.h&gt; #include &lt;GL/glut.h&gt; void init() { glClearColor(1.0,1.0,1.0,0.0); glMatrixMode(GL_PROJECTION); gluOrtho2D(0.0,200.0,0.0,150.0); } void lineSegment() { glClear(GL_COLOR_BUFFER_BIT); glColor3f(0.0,0.0,1.0); glBegin(GL_TRIANGLES); glVertex2i(40,120); glVertex2i(40,20); glVertex2i(80,20); glEnd(); glFlush(); } int main() { glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB); glutInitWindowPosition(50,100); glutInitWindowSize(400,300); glutCreateWindow("An Example OpenGL...."); init(); glutDisplayFunc(lineSegment); glutMainLoop(); return 0; } </code></pre> <p>and this is my error.</p> <pre><code>funfullson@funfullson:~$ gcc gl.cpp /tmp/cchfRGT2.o: In function `init()': gl.cpp:(.text+0x2a): undefined reference to `glClearColor' gl.cpp:(.text+0x36): undefined reference to `glMatrixMode' gl.cpp:(.text+0x5a): undefined reference to `gluOrtho2D' /tmp/cchfRGT2.o: In function `lineSegment()': gl.cpp:(.text+0x6e): undefined reference to `glClear' gl.cpp:(.text+0x8d): undefined reference to `glColor3f' gl.cpp:(.text+0x99): undefined reference to `glBegin' gl.cpp:(.text+0xad): undefined reference to `glVertex2i' gl.cpp:(.text+0xc1): undefined reference to `glVertex2i' gl.cpp:(.text+0xd5): undefined reference to `glVertex2i' gl.cpp:(.text+0xda): undefined reference to `glEnd' gl.cpp:(.text+0xdf): undefined reference to `glFlush' /tmp/cchfRGT2.o: In function `main': gl.cpp:(.text+0xf6): undefined reference to `glutInitDisplayMode' gl.cpp:(.text+0x10a): undefined reference to `glutInitWindowPosition' gl.cpp:(.text+0x11e): undefined reference to `glutInitWindowSize' gl.cpp:(.text+0x12a): undefined reference to `glutCreateWindow' gl.cpp:(.text+0x13b): undefined reference to `glutDisplayFunc' gl.cpp:(.text+0x140): undefined reference to `glutMainLoop' /tmp/cchfRGT2.o:(.eh_frame+0x12): undefined reference to `__gxx_personality_v0' collect2: ld returned 1 exit status </code></pre> <p>I dont know what I have to do.please learn me how to do it.</p>
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    1. USfunfullson
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    1. COI'm beginning getting tired of this, but anyway: Projection matrix and Viewport setup belong in the display routine, not some obscure "init" function. -- The solution to your actual problem has been given in an answer already.
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      1. USdatenwolf
 

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