private void BindShader([MaybeNull] WorldCamera camera,
RenderingDevice device,
IList <Light3d> lights,
MdfRenderOverrides overrides)
{
// Fill out the globals for the shader
var globals = new MdfGlobalConstants();
Matrix4x4 viewProj;
if (overrides != null && overrides.uiProjection)
{
viewProj = device.UiProjection;
}
else
{
viewProj = camera?.GetViewProj() ?? device.UiProjection;
}
// Should we use a separate world matrix?
if (overrides != null && overrides.useWorldMatrix)
{
// Build a world * view * proj matrix
var worldViewProj = overrides.worldMatrix * viewProj;
globals.viewProj = worldViewProj;
}
else
{
globals.viewProj = viewProj;
}
// Set material diffuse color for shader
Vector4 color;
// TODO: This is a bug, it should check overrideDiffuse
if (overrides != null && overrides.overrideColor != default)
{
color = overrides.overrideColor.ToRGBA();
}
else
{
color = new PackedLinearColorA(mSpec.diffuse).ToRGBA();
}
globals.matDiffuse = color;
if (overrides != null && overrides.alpha != 1.0f)
{
globals.matDiffuse.W *= overrides.alpha;
}
// Set time for UV animation in minutes as a floating point number
var timeInSec = (float)(device.GetLastFrameStart() - device.GetDeviceCreated()).Seconds;
globals.uvAnimTime.X = timeInSec / 60.0f;
// Clamp to [0, 1]
if (globals.uvAnimTime.X > 1)
{
globals.uvAnimTime.X -= MathF.Floor(globals.uvAnimTime.X);
}
// Swirl is more complicated due to cos/sin involvement
// This means speedU is in "full rotations every 60 seconds" . RPM
var uvRotations = globals.UvRotations;
for (var i = 0; i < mSpec.samplers.Count; ++i)
{
var sampler = mSpec.samplers[i];
if (sampler.uvType != MdfUvType.Swirl)
{
continue;
}
ref var uvRot = ref uvRotations[i];
uvRot.X = MathF.Cos(sampler.speedU * globals.uvAnimTime.X * MathF.PI * 2) * 0.1f;
uvRot.Y = MathF.Sin(sampler.speedV * globals.uvAnimTime.X * MathF.PI * 2) * 0.1f;
}