private void GenVertices(ref VertexBufferObjectBase vbo)
{
float splitGridSize = m_farPlaneDistance / 2;
float xLeft = -splitGridSize, xRight = splitGridSize, zNear = -splitGridSize, zFar = splitGridSize;
Int32 gridSquareCount = (Int32)Math.Ceiling(m_farPlaneDistance / m_gridSquareSize);
Int32 nodesCount = gridSquareCount * 8;
float[,] vertices = new float[nodesCount, 3];
float localXLeft = xLeft;
// Draw Grid at X-axis
for (Int32 i = 0, j = 0; i < gridSquareCount; i++, j += 4, localXLeft += m_gridSquareSize)
{
vertices[j, 0] = localXLeft;
vertices[j, 1] = 0.0f;
vertices[j, 2] = zNear;
vertices[j + 1, 0] = localXLeft;
vertices[j + 1, 1] = 0.0f;
vertices[j + 1, 2] = zFar;
vertices[j + 2, 0] = localXLeft + m_gridSquareSize;
vertices[j + 2, 1] = 0.0f;
vertices[j + 2, 2] = zFar;
vertices[j + 3, 0] = localXLeft + m_gridSquareSize;
vertices[j + 3, 1] = 0.0f;
vertices[j + 3, 2] = zNear;
}
Int32 verticesContinue = nodesCount / 2;
// Draw Grid at Z-axis
for (Int32 i = 0, j = verticesContinue; i < gridSquareCount; i++, j += 4, zNear += m_gridSquareSize)
{
vertices[j, 0] = xLeft;
vertices[j, 1] = 0.0f;
vertices[j, 2] = zNear;
vertices[j + 1, 0] = xRight;
vertices[j + 1, 1] = 0.0f;
vertices[j + 1, 2] = zNear;
vertices[j + 2, 0] = xRight;
vertices[j + 2, 1] = 0.0f;
vertices[j + 2, 2] = zNear + m_gridSquareSize;
vertices[j + 3, 0] = xLeft;
vertices[j + 3, 1] = 0.0f;
vertices[j + 3, 2] = zNear + m_gridSquareSize;
}
vbo = new VertexBufferObjectTwoDimension <float>(vertices, OpenTK.Graphics.OpenGL.BufferTarget.ArrayBuffer, 0, 3, VertexBufferObjectBase.DataCarryFlag.Invalidate);
}
public WorldGrid(float farPlaneDistance)
{
m_farPlaneDistance = farPlaneDistance;
m_shader = PoolProxy.GetResource <ObtainShaderPool, ShaderAllocationPolicy <WorldGridShader>, string, WorldGridShader>(string.Format("{0}gridVS.glsl,{0}gridFS.glsl", ProjectFolders.ShadersPath));
m_vao = new VertexArrayObject();
VertexBufferObjectBase verticesVBO = null;
GenVertices(ref verticesVBO);
m_vao.AddVBO(verticesVBO);
m_vao.BindBuffersToVao();
}
