ebiten/graphicscontext.go

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// Copyright 2014 Hajime Hoshi
//
// 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.
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package ebiten
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import (
"math"
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"github.com/hajimehoshi/ebiten/internal/clock"
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"github.com/hajimehoshi/ebiten/internal/graphicscommand"
"github.com/hajimehoshi/ebiten/internal/graphicsdriver"
"github.com/hajimehoshi/ebiten/internal/hooks"
"github.com/hajimehoshi/ebiten/internal/shareable"
"github.com/hajimehoshi/ebiten/internal/ui"
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"github.com/hajimehoshi/ebiten/internal/web"
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)
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func newGraphicsContext(f func(*Image) error) *graphicsContext {
return &graphicsContext{
f: f,
}
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}
type graphicsContext struct {
f func(*Image) error
offscreen *Image
screen *Image
screenWidth int
screenHeight int
screenScale float64
initialized bool
invalidated bool // browser only
offsetX float64
offsetY float64
}
func (c *graphicsContext) Invalidate() {
// Note that this is called only on browsers so far.
// TODO: On mobiles, this function is not called and instead IsTexture is called
// to detect if the context is lost. This is simple but might not work on some platforms.
// Should Invalidate be called explicitly?
c.invalidated = true
}
func (c *graphicsContext) SetSize(screenWidth, screenHeight int, screenScale float64) {
c.screenScale = screenScale
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if c.screen != nil {
_ = c.screen.Dispose()
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}
if c.offscreen != nil {
_ = c.offscreen.Dispose()
}
c.offscreen = newVolatileImage(screenWidth, screenHeight)
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w := int(float64(screenWidth) * screenScale)
h := int(float64(screenHeight) * screenScale)
px0, py0, px1, py1 := ui.ScreenPadding()
c.screen = newImageWithScreenFramebuffer(w+int(math.Ceil(px0+px1)), h+int(math.Ceil(py0+py1)))
c.screenWidth = w
c.screenHeight = h
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c.offsetX = px0
c.offsetY = py0
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}
func (c *graphicsContext) initializeIfNeeded() error {
if !c.initialized {
if err := shareable.InitializeGraphicsDriverState(); err != nil {
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return err
}
c.initialized = true
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}
if err := c.restoreIfNeeded(); err != nil {
return err
}
return nil
}
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func (c *graphicsContext) Update(afterFrameUpdate func()) error {
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tps := int(MaxTPS())
updateCount := clock.Update(tps)
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// TODO: If updateCount is 0 and vsync is disabled, swapping buffers can be skipped.
if err := c.initializeIfNeeded(); err != nil {
return err
}
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for i := 0; i < updateCount; i++ {
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c.offscreen.Clear()
// Mipmap images should be disposed by fill.
setDrawingSkipped(i < updateCount-1)
if err := hooks.RunBeforeUpdateHooks(); err != nil {
return err
}
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if err := c.f(c.offscreen); err != nil {
return err
}
afterFrameUpdate()
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}
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// Before clearing the screen, the offscreen's pixels must be resolved.
// After clearing the screen, resolving doesn't work. This is very hacky
// but we could not find other way so far (#792).
c.offscreen.resolvePixelsToSet(true)
// This clear is needed for fullscreen mode or some mobile platforms (#622).
c.screen.Clear()
op := &DrawImageOptions{}
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switch graphicscommand.Driver().VDirection() {
case graphicsdriver.VDownward:
// c.screen is special: its Y axis is down to up,
// and the origin point is lower left.
op.GeoM.Scale(c.screenScale, -c.screenScale)
op.GeoM.Translate(0, float64(c.screenHeight))
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case graphicsdriver.VUpward:
op.GeoM.Scale(c.screenScale, c.screenScale)
default:
panic("not reached")
}
op.GeoM.Translate(c.offsetX, c.offsetY)
op.CompositeMode = CompositeModeCopy
// filterScreen works with >=1 scale, but does not well with <1 scale.
// Use regular FilterLinear instead so far (#669).
if c.screenScale >= 1 {
op.Filter = filterScreen
} else {
op.Filter = FilterLinear
}
_ = c.screen.DrawImage(c.offscreen, op)
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shareable.ResolveStaleImages()
if err := shareable.Error(); err != nil {
return err
}
return nil
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}
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func (c *graphicsContext) needsRestoring() (bool, error) {
if web.IsBrowser() {
return c.invalidated, nil
}
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return c.offscreen.mipmap.original().IsInvalidated()
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}
func (c *graphicsContext) restoreIfNeeded() error {
if !shareable.IsRestoringEnabled() {
return nil
}
r, err := c.needsRestoring()
if err != nil {
return err
}
if !r {
return nil
}
if err := shareable.Restore(); err != nil {
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return err
}
c.invalidated = false
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return nil
}