func UpdateFades() (bool, error) {
if Fade.IsActive() {
definition, err := GetFadeDefinition(Fade.Type)
if err != nil {
return false, err
}
tickCount, err0 := cseries.MachineTickCount()
if err0 != nil {
return false, err0
}
update := false
var transparency cseries.Fixed
phase := int16(tickCount - Fade.StartTick) // hmmm, this could be a problem
if phase >= definition.Period {
transparency = definition.FinalTransparency
Fade.SetActive(false)
update = true
} else {
if (tickCount - Fade.LastUpdateTick) >= MinimumFadeUpdateTicks {
transparency = definition.InitialTransparency + (cseries.Fixed(phase)*(definition.FinalTransparency-definition.InitialTransparency))/cseries.Fixed(definition.Period)
if (definition.Flags & RandomTransparencyFlag) != 0 {
transparency += cseries.Fixed(FadesRandom()) % (definition.FinalTransparency - transparency)
}
update = true
}
if update {
RecalculateAndDisplayColorTable(Fade.Type, transparency, Fade.OriginalColorTable, Fade.AnimatedColorTable)
}
}
}
return Fade.IsActive(), nil
}
func TintColorTable(original, animated ColorTable, color *RgbColor, transparency cseries.Fixed) {
adjustedTransparency := transparency >> AdjustedTransparencyDownshift
fn := func(unadjustedValue, colorValue cseries.Word) cseries.Word {
return cseries.Word(cseries.Fixed(unadjustedValue) + ((cseries.Fixed(colorValue-unadjustedValue) * adjustedTransparency) >> (cseries.FixedFractionalBits - AdjustedTransparencyDownshift)))
}
for i := 0; i < len(original); i++ {
animated[i].Red = fn(original[i].Red, color.Red)
animated[i].Green = fn(original[i].Green, color.Green)
animated[i].Blue = fn(original[i].Blue, color.Blue)
}
}
func (this mediaIndex) UpdateOneMedia(forceUpdate bool) {
media := this.GetMediaData()
def := GetMediaDefinition(media.Type)
// update height
media.Height = media.Low + WorldDistance(cseries.Fixed(cseries.Fixed(media.High-media.Low)*GetLightIntensity(media.LightIndex)).IntegralPart())
// update texture
media.Texture = BuildDescriptor(def.Collection, def.Shape)
media.TransferMode = def.TransferMode
}
func BurnColorTable(original, animated ColorTable, color *RgbColor, transparency cseries.Fixed) {
customCeiling := func(n, ceiling int32) int32 {
if n > ceiling {
return ceiling
} else {
return n
}
}
updateElement := func(adjusted cseries.Word, component int32) cseries.Word {
return cseries.Word(customCeiling(component, int32(adjusted)))
}
computeComponent := func(unadjusted, color cseries.Word, transparency cseries.Fixed) int32 {
return int32(cseries.Fixed(((color * unadjusted) >> cseries.FixedFractionalBits)) + transparency)
}
transparency = cseries.FixedOne - transparency
for i := 0; i < len(original); i++ {
r, g, b := original[i].Red, original[i].Green, original[i].Blue
component := computeComponent(r, color.Red, transparency)
animated[i].Red = updateElement(r, component)
component = computeComponent(g, color.Green, transparency)
animated[i].Green = updateElement(g, component)
component = computeComponent(b, color.Blue, transparency)
animated[i].Blue = updateElement(b, component)
}
//component= ((color->red*unadjusted->red)>>FIXED_FRACTIONAL_BITS) + transparency, adjusted->red= CEILING(component, unadjusted->red);
//component= ((color->green*unadjusted->green)>>FIXED_FRACTIONAL_BITS) + transparency, adjusted->green= CEILING(component, unadjusted->green);
//component= ((color->blue*unadjusted->blue)>>FIXED_FRACTIONAL_BITS) + transparency, adjusted->blue= CEILING(component, unadjusted->blue);
}
func DodgeColorTable(original, animated ColorTable, color *RgbColor, transparency cseries.Fixed) {
customCeiling := func(n, ceiling int32) int32 {
if n > ceiling {
return ceiling
} else {
return n
}
}
computeComponent := func(unadjusted, color cseries.Word) int32 {
return int32(0xffff - cseries.Fixed((((color ^ 0xffff) * unadjusted) >> cseries.FixedFractionalBits)) - transparency)
}
updateElement := func(adjusted cseries.Word, component int32) cseries.Word {
return cseries.Word(customCeiling(component, int32(adjusted)))
}
for i := 0; i < len(original); i++ {
var component int32
component = computeComponent(original[i].Red, color.Red)
animated[i].Red = updateElement(original[i].Red, component)
component = computeComponent(original[i].Blue, color.Blue)
animated[i].Blue = updateElement(original[i].Blue, component)
component = computeComponent(original[i].Green, color.Green)
animated[i].Green = updateElement(original[i].Green, component)
}
// Using the comma operator instead of ; for assignment...why?
//component= 0xffff - (((color->red^0xffff)*unadjusted->red)>>FIXED_FRACTIONAL_BITS) - transparency, adjusted->red= CEILING(component, unadjusted->red);
//component= 0xffff - (((color->green^0xffff)*unadjusted->green)>>FIXED_FRACTIONAL_BITS) - transparency, adjusted->green= CEILING(component, unadjusted->green);
//component= 0xffff - (((color->blue^0xffff)*unadjusted->blue)>>FIXED_FRACTIONAL_BITS) - transparency, adjusted->blue= CEILING(component, unadjusted->blue);
}
func (this *MediaData) CalculateMediaHeight() int16 {
return int16(this.Low) + cseries.Fixed(cseries.Fixed(this.Height-this.Low)*GetLightIntensity(this.LightIndex)).IntegralPart()
}