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OpenGL and GLUT memory runtime error


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#1 zoner7   Members   -  Reputation: 110

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Posted 14 March 2011 - 05:53 PM

So I'm writing my first program in OpenGL using GLUT. I'm writing this program while simultaneously reading the OpenGL Superbible 5th edition. After tracing through the source code, I learned that the error occurs in the OpenGL Superbible's source... but I have a feeling it's partially my fault.

Here is the error: "Unhandled exception at 0x00c0ff8b in Primitives.exe: 0xC0000005: Access violation writing location 0x00000004."
The error occurs in this chunk of code inside GLBatch.cpp on the line "nNumVerts = nVerts;":


// Start the primitive batch.
void GLBatch::Begin(GLenum primitive, GLuint nVerts, GLuint nTextureUnits)
	{
	primitiveType = primitive;
	nNumVerts = nVerts;
    
    if(nTextureUnits > 4)   // Limit to four texture units
        nTextureUnits = 4;
        
	nNumTextureUnits = nTextureUnits;
	
	if(nNumTextureUnits != 0) {
		uiTextureCoordArray = new GLuint[nNumTextureUnits];

		// An array of pointers to texture coordinate arrays
		pTexCoords = new M3DVector2f*[nNumTextureUnits];
		for(unsigned int i = 0; i < nNumTextureUnits; i++) {
			uiTextureCoordArray[i] = 0;
			pTexCoords[i] = NULL;
			}
		}
		
	// Vertex Array object for this Array
    #ifndef OPENGL_ES
	glGenVertexArrays(1, &vertexArrayObject);
	glBindVertexArray(vertexArrayObject);
	#endif
    }

Here is my code that calls this GLBatch::Begin():


temp->Begin(GL_TRIANGLES, 3);
temp->CopyVertexData3f(vertices);
temp->End();
batches.push_back(*temp);



Does anyone have an idea what's causing the problem? It's probably something very simple

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#2 zerothrillz   Members   -  Reputation: 152

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Posted 14 March 2011 - 06:03 PM

Well, it's more than likely wholly your part Posted Image.

What are you getting from glGetError()?

[edit] nm, Maybe I should have read that second line there...[/edit]

How are you initializing temp?

#3 zoner7   Members   -  Reputation: 110

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Posted 14 March 2011 - 06:35 PM

I figured out what was going wrong. Temp was going out of scope
Thank you




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