Thread: Plane class

Hey guys,

I have tried to write a generic plane class that when passed parameters will create a flat 2D plane. It all looks ok to me, but I get a run time error and I am not sure what is wrong.

I am pasting the main bits of code here, and attaching a picture that helps to explain how it works. Vertex3f is a class that holds 3 floats.

Code:

bool Plane::Create(float sX, float sY, int dX, int dY, char *tex)
{
	texFile = tex;

	sizeX = sX;
	sizeY = sY;
	divisionsX = dX;
	divisionsY = dY;

	int array_size = (divisionsX + 2) * (divisionsY + 2);

	vertexBuffer = new Vector3f[array_size];
	normalBuffer = new Vector3f[array_size];
	texCoordBuffer = new Vector2f[array_size];
	indexBuffer = new unsigned short[(((divisionsX+1)*2)+2)*(divisionsY+1)];


	for (int i = 0; i < array_size; i++)
	{
		normalBuffer[i].x = 0.0f;
		normalBuffer[i].y = 1.0f;
		normalBuffer[i].z = 0.0f;
	}

	//generate vertex and tex co-ords.
	float vertex_incX = sizeX / (divisionsX + 1);
	float vertex_incY = sizeY / (divisionsY + 1);
	int vPos = 0;
	for (int i = 0; i <= divisionsY + 1; i++)
	{
		for (int j = 0; j <= divisionsX + 1; j++)
		{
			vertexBuffer[vPos].x = vertex_incX * j;
			vertexBuffer[vPos].y = 0.0f;
			vertexBuffer[vPos].z = vertex_incY * i;

			texCoordBuffer[vPos].x = (float)(1 / (divisionsX + 1)) * j;
			texCoordBuffer[vPos].y = (float)(1 / (divisionsY + 1)) * i;

			vPos++;
		}
	}

	//generate the index array.
	int iPos = 0;
	for (int j = 0; j <= divisionsY; j++)
	{
		int start1 = j * (divisionsX + 2);
		int start2 = (j + 1) * (divisionsX + 2);

		for (int i = 0; i <= divisionsX+1; i++)
		{
			indexBuffer[iPos] = start1;
			iPos++;
			indexBuffer[iPos] = start2;
			iPos++;
			start1++;
			start2++;
		}
	}

	texID = TextureManager::getInstance()->LoadTexture(texFile);

	return true;
}


void Plane::Draw() const
{
	glEnable(GL_TEXTURE_2D);
	TextureManager::getInstance()->ApplyTexture(texID);

	glEnableClientState(GL_VERTEX_ARRAY);
	glVertexPointer(3, GL_FLOAT, 0, &vertexBuffer[0]);

	glEnableClientState(GL_NORMAL_ARRAY);
	glNormalPointer(GL_FLOAT, 0, &normalBuffer[0]);

	glEnableClientState(GL_TEXTURE_COORD_ARRAY);
	glTexCoordPointer(2, GL_FLOAT, 0, &texCoordBuffer[0]);

	
	int rowSize = ((divisionsX+1)*2)+2;
	for (int i = 0; i< divisionsY + 1; i++)
	{
		glDrawElements(GL_TRIANGLE_STRIP, rowSize, GL_UNSIGNED_INT, &indexBuffer[i*rowSize]);
	}


	glDisableClientState(GL_VERTEX_ARRAY);

	glDisableClientState(GL_NORMAL_ARRAY);

	glDisableClientState(GL_TEXTURE_COORD_ARRAY);

	glDisable(GL_TEXTURE_2D);
}

The problem is apparently with this line:
Code:

glDrawElements(GL_TRIANGLE_STRIP, rowSize, GL_UNSIGNED_INT, &indexBuffer[i*rowSize]);


It gives the error:
Unhandled exception at 0x691ca718 in Zargons2.exe: 0xC0000005: Access violation reading location 0x018360bc.

Any ideas?