public OpenGLVertexInputElement(VertexInputElement genericElement, int offset)
{
SizeInBytes = genericElement.SizeInBytes;
ElementCount = FormatHelpers.GetElementCount(genericElement.ElementFormat);
Type = GetGenericFormatType(genericElement.ElementFormat);
Offset = offset;
Normalized = genericElement.SemanticType == VertexSemanticType.Color && genericElement.ElementFormat == VertexElementFormat.Byte4;
InstanceStepRate = genericElement.InstanceStepRate;
}
private void FlushVertexLayouts()
{
uint totalSlotsBound = 0;
VertexLayoutDescription[] layouts = _graphicsPipeline.GraphicsDescription.ShaderSet.VertexLayouts;
for (int i = 0; i < layouts.Length; i++)
{
VertexLayoutDescription input = layouts[i];
OpenGLBuffer vb = _vertexBuffers[i];
glBindBuffer(BufferTarget.ArrayBuffer, vb.Buffer);
uint offset = 0;
for (uint slot = 0; slot < input.Elements.Length; slot++)
{
ref VertexElementDescription element = ref input.Elements[slot]; // Large structure -- use by reference.
uint actualSlot = totalSlotsBound + slot;
if (actualSlot >= _vertexAttributesBound)
{
glEnableVertexAttribArray(actualSlot);
}
VertexAttribPointerType type = OpenGLFormats.VdToGLVertexAttribPointerType(
element.Format,
out bool normalized);
glVertexAttribPointer(
actualSlot,
FormatHelpers.GetElementCount(element.Format),
type,
normalized,
(uint)_graphicsPipeline.VertexStrides[i],
(void *)offset);
uint stepRate = input.InstanceStepRate;
if (_vertexAttribDivisors[actualSlot] != stepRate)
{
glVertexAttribDivisor(actualSlot, stepRate);
_vertexAttribDivisors[actualSlot] = stepRate;
}
offset += FormatHelpers.GetSizeInBytes(element.Format);
}
totalSlotsBound += (uint)input.Elements.Length;
}