public int SetVertexAttributes(VertexBuffer[] vertexBuffers, int previousAttributesBound)
{
int totalSlotsBound = 0;
for (int i = 0; i < VBLayoutsBySlot.Length; i++)
{
OpenGLMaterialVertexInput input = VBLayoutsBySlot[i];
((OpenGLVertexBuffer)vertexBuffers[i]).Apply();
for (int slot = 0; slot < input.Elements.Length; slot++)
{
OpenGLMaterialVertexInputElement element = input.Elements[slot];
int actualSlot = totalSlotsBound + slot;
GL.EnableVertexAttribArray(actualSlot);
GL.VertexAttribPointer(actualSlot, element.ElementCount, element.Type, element.Normalized, input.VertexSizeInBytes, element.Offset);
GL.VertexAttribDivisor(actualSlot, element.InstanceStepRate);
}
totalSlotsBound += input.Elements.Length;
}
for (int extraSlot = totalSlotsBound; extraSlot < previousAttributesBound; extraSlot++)
{
GL.DisableVertexAttribArray(extraSlot);
}
return(totalSlotsBound);
}
public int SetVertexAttributes(int vertexBufferSlot, OpenGLVertexBuffer vb, int previousAttributesBound)
{
// TODO: Related to OpenGLRenderContext.PlatformSetVertexBuffer()
// These attributes should be lazily set on a draw call or something.
if (vertexBufferSlot <= VBLayoutsBySlot.Length)
{
return(previousAttributesBound);
}
int baseSlot = GetSlotBaseIndex(vertexBufferSlot);
OpenGLMaterialVertexInput input = VBLayoutsBySlot[vertexBufferSlot];
vb.Apply();
for (int i = 0; i < input.Elements.Length; i++)
{
OpenGLMaterialVertexInputElement element = input.Elements[i];
int slot = baseSlot + i;
GL.EnableVertexAttribArray(slot);
GL.VertexAttribPointer(slot, element.ElementCount, element.Type, element.Normalized, input.VertexSizeInBytes, element.Offset);
}
for (int extraSlot = input.Elements.Length; extraSlot < previousAttributesBound; extraSlot++)
{
GL.DisableVertexAttribArray(extraSlot);
}
return(input.Elements.Length);
}