private void SetVertexAttributes(OpenGLVertexInputLayout inputlayout, VertexBuffer[] vertexBuffers)
{
int totalSlotsBound = 0;
for (int i = 0; i < inputlayout.VBLayoutsBySlot.Length; i++)
{
OpenGLVertexInput input = inputlayout.VBLayoutsBySlot[i];
OpenGLVertexBuffer vb = ((OpenGLVertexBuffer)vertexBuffers[i]);
vb.Apply();
for (int slot = 0; slot < input.Elements.Length; slot++)
{
ref OpenGLVertexInputElement element = ref input.Elements[slot]; // Large structure -- use by reference.
int actualSlot = totalSlotsBound + slot;
if (actualSlot >= _vertexAttributesBound)
{
GL.EnableVertexAttribArray(actualSlot);
}
GL.VertexAttribPointer(actualSlot, element.ElementCount, element.Type, element.Normalized, vb.Stride, element.Offset);
int stepRate = element.InstanceStepRate;
if (_vertexAttribDivisors[actualSlot] != stepRate)
{
GL.VertexAttribDivisor(actualSlot, stepRate);
_vertexAttribDivisors[actualSlot] = stepRate;
}
}
totalSlotsBound += input.Elements.Length;
}
public OpenGLVertexInput(VertexInputDescription genericInput)
{
VertexSizeInBytes = genericInput.VertexSizeInBytes;
Elements = new OpenGLVertexInputElement[genericInput.Elements.Length];
int offset = 0;
for (int i = 0; i < Elements.Length; i++)
{
var genericElement = genericInput.Elements[i];
Elements[i] = new OpenGLVertexInputElement(genericElement, offset);
offset += genericElement.SizeInBytes;
}
}