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https://github.com/hajimehoshi/ebiten.git
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2d079b123f
After Fill command, the image doesn't have to keep the restoring information. Now Fill command is as same as DrawTriangles, there is no way for restorable.Image to know whether it can reset the state or not. ResetRestoringState clears the state explicitly.
144 lines
3.1 KiB
Go
144 lines
3.1 KiB
Go
// Copyright 2018 The Ebiten Authors
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package ebiten
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import (
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"image"
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"math"
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"github.com/hajimehoshi/ebiten/internal/driver"
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"github.com/hajimehoshi/ebiten/internal/graphics"
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"github.com/hajimehoshi/ebiten/internal/shareable"
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)
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type mipmap struct {
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orig *shareable.Image
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imgs map[image.Rectangle][]*shareable.Image
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}
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func newMipmap(s *shareable.Image) *mipmap {
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return &mipmap{
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orig: s,
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imgs: map[image.Rectangle][]*shareable.Image{},
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}
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}
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func (m *mipmap) original() *shareable.Image {
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return m.orig
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}
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func (m *mipmap) level(r image.Rectangle, level int) *shareable.Image {
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if level <= 0 {
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panic("ebiten: level must be positive at level")
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}
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imgs, ok := m.imgs[r]
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if !ok {
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imgs = []*shareable.Image{}
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m.imgs[r] = imgs
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}
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idx := level - 1
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size := r.Size()
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w, h := size.X, size.Y
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if len(imgs) > 0 {
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w, h = imgs[len(imgs)-1].Size()
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}
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for len(imgs) < idx+1 {
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if m.orig.IsVolatile() {
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panic("ebiten: mipmap images for a volatile image is not implemented yet")
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}
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w2 := w / 2
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h2 := h / 2
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if w2 == 0 || h2 == 0 {
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return nil
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}
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s := shareable.NewImage(w2, h2)
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var src *shareable.Image
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vs := vertexSlice(4)
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if l := len(imgs); l == 0 {
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src = m.orig
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graphics.PutQuadVertices(vs, src, r.Min.X, r.Min.Y, r.Max.X, r.Max.Y, 0.5, 0, 0, 0.5, 0, 0, 1, 1, 1, 1)
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} else {
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src = m.level(r, l)
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graphics.PutQuadVertices(vs, src, 0, 0, w, h, 0.5, 0, 0, 0.5, 0, 0, 1, 1, 1, 1)
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}
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is := graphics.QuadIndices()
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s.DrawTriangles(src, vs, is, nil, driver.CompositeModeCopy, driver.FilterLinear, driver.AddressClampToZero)
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imgs = append(imgs, s)
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w = w2
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h = h2
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}
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m.imgs[r] = imgs
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if len(imgs) <= idx {
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return nil
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}
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return imgs[idx]
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}
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func (m *mipmap) isDisposed() bool {
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return m.orig == nil
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}
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func (m *mipmap) dispose() {
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m.disposeMipmaps()
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m.orig.Dispose()
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m.orig = nil
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}
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func (m *mipmap) disposeMipmaps() {
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for _, a := range m.imgs {
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for _, img := range a {
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img.Dispose()
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}
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}
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for k := range m.imgs {
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delete(m.imgs, k)
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}
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}
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func (m *mipmap) clearFramebuffer() {
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m.orig.ClearFramebuffer()
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}
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func (m *mipmap) resetRestoringState() {
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m.orig.ResetRestoringState()
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}
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// mipmapLevel returns an appropriate mipmap level for the given determinant of a geometry matrix.
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//
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// mipmapLevel returns -1 if det is 0.
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//
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// mipmapLevel panics if det is NaN.
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func mipmapLevel(det float32) int {
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if math.IsNaN(float64(det)) {
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panic("graphicsutil: det must be finite")
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}
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if det == 0 {
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return -1
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}
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d := math.Abs(float64(det))
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level := 0
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for d < 0.25 {
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level++
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d *= 4
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}
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return level
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}
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