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PO“Access violation reading location 0x000000000” in a simple OpenGL app
 

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  1. PO“Access violation reading location 0x000000000” in a simple OpenGL app
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    <p>I have a problem in openGL when using buffer object to store vertex array . when I run the code , a window appears that display message " <em>access violation reading location 0x000000000</em> " and when I move the cursor to arrow beside glGenBuufers function I see description: <em>this is the next statement to execute when this thread returns from current function</em>.</p> <p><img src="https://i.stack.imgur.com/e8nqy.jpg" alt="IDE snapshot"></p> <p>Code:</p> <pre><code>int frame=0; void display(); void datasource(); GLuint vbo; void datasource() { GLfloat vertex1[]={-1.000000 ,0.500000 ,-0.700000 ,0.500000 ,-1.000000 ,0.800000 ,-0.700000 ,0.800000 ,-0.400000 ,0.500000 ,-0.100000 ,0.500000 ,-0.400000 ,0.800000 ,-0.100000 ,0.200000 ,0.500000 ,0.500000 ,0.500000 ,0.200000 ,0.800000 ,0.500000,0.800000 ,0.800000 ,0.800000 ,0.500000 ,1.100000 ,0.500000 ,0.800000 ,0.800000 ,1.100000,0.800000 }; glGenBuffers(1,&amp;vbo); glBindBuffer(GL_ARRAY_BUFFER,vbo); glBufferData(GL_ARRAY_BUFFER,sizeof(vertex1),vertex1,GL_STATIC_DRAW); } void init(int arc,char **arch) { glutInit(&amp;arc,arch); glutInitWindowSize(800,800); glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA); glutCreateWindow("chess"); glClearColor(0.0,0.0,0.0,0.0); glutDisplayFunc(display); } int main(int arc,char **arch) { init(arc,arch); datasource(); glutMainLoop(); return 0; } void display() { frame++; glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); glDrawArrays(GL_TRIANGLE_STRIP,0,8); glutSwapBuffers(); glutPostRedisplay(); } </code></pre> <p>What did I do wrong?</p>
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    1. USuser1841718
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    1. COSO is not for code review. Please ask a concrete technical question.
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      1. PO“Access violation reading location 0x000000000” in a simple OpenGL app
      1. USJens Gustedt
    2. COI don't see where you initialise vbo before you pass its address to glGenBuffers
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      1. USLord Peter
    3. CODoes he have to initialize it? The second argument to `glGenBuffers` is an array of `GLuint`s to store the created buffers. If there’s just one buffer, passing an address of a single `GLuint` should do?
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      1. PO“Access violation reading location 0x000000000” in a simple OpenGL app
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