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instancelist.go
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/
instancelist.go
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// Copyright 2016 Arne Roomann-Kurrik
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package sprites
import (
"github.com/kurrik/opengl-benchmarks/common/render"
)
type SpriteInstances interface {
render.Instances
SetFrame(instance *render.Instance, frame string) (err error)
}
type SpriteInstanceList struct {
*render.InstanceList
pixelsPerUnit float32 // TODO: Should be in sheet
sheet *Sheet
}
func NewSpriteInstanceList(sheet *Sheet, pixelsPerUnit float32) *SpriteInstanceList {
return &SpriteInstanceList{
InstanceList: render.NewInstanceList(),
pixelsPerUnit: pixelsPerUnit,
sheet: sheet,
}
}
func (l *SpriteInstanceList) SetFrame(instance *render.Instance, frame string) (err error) {
var s *Sprite
if instance == nil {
return // No error
}
if s, err = l.sheet.Sprite(frame); err != nil {
return
}
instance.Frame = s.Index()
instance.SetScale(s.WorldDimensions(l.pixelsPerUnit).Vec3(1.0))
instance.MarkChanged()
instance.Key = frame
return
}