mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-26 19:58:54 +01:00
102 lines
2.3 KiB
Go
102 lines
2.3 KiB
Go
/*
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Copyright 2014 Hajime Hoshi
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package blocks
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import (
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"github.com/hajimehoshi/ebiten"
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)
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func init() {
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renderTargetSizes["scene_manager_transition_from"] =
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Size{ScreenWidth, ScreenHeight}
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renderTargetSizes["scene_manager_transition_to"] =
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Size{ScreenWidth, ScreenHeight}
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}
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type Scene interface {
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Update(state *GameState)
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Draw(context ebiten.GraphicsContext, textures *Textures)
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}
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const transitionMaxCount = 20
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type SceneManager struct {
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current Scene
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next Scene
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transitionCount int
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}
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func NewSceneManager(initScene Scene) *SceneManager {
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return &SceneManager{
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current: initScene,
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transitionCount: -1,
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}
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}
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func (s *SceneManager) Update(state *GameState) {
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if s.transitionCount == -1 {
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s.current.Update(state)
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return
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}
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s.transitionCount++
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if transitionMaxCount <= s.transitionCount {
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s.current = s.next
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s.next = nil
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s.transitionCount = -1
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}
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}
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func (s *SceneManager) Draw(context ebiten.GraphicsContext, textures *Textures) {
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if s.transitionCount == -1 {
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s.current.Draw(context, textures)
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return
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}
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from := textures.GetRenderTarget("scene_manager_transition_from")
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context.PushRenderTarget(from)
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context.Clear()
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s.current.Draw(context, textures)
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context.PopRenderTarget()
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to := textures.GetRenderTarget("scene_manager_transition_to")
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context.PushRenderTarget(to)
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context.Clear()
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s.next.Draw(context, textures)
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context.PopRenderTarget()
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color := ebiten.ColorMatrixI()
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ebiten.DrawWhole(
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context.RenderTarget(from),
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ScreenWidth,
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ScreenHeight,
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ebiten.GeometryMatrixI(),
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color)
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alpha := float64(s.transitionCount) / float64(transitionMaxCount)
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color.Elements[3][3] = alpha
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ebiten.DrawWhole(
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context.RenderTarget(to),
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ScreenWidth,
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ScreenHeight,
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ebiten.GeometryMatrixI(),
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color)
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}
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func (s *SceneManager) GoTo(scene Scene) {
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s.next = scene
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s.transitionCount = 0
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}
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