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/graphics"
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"github.com/hajimehoshi/ebiten/internal/graphics/opengl"
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"github.com/hajimehoshi/ebiten/internal/ui"
)
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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
offscreen2 *Image // TODO: better name
screen *Image
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screenScale float64
initialized bool
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}
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func (c *graphicsContext) SetSize(screenWidth, screenHeight int, screenScale float64) error {
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if c.screen != nil {
c.screen.Dispose()
}
if c.offscreen != nil {
c.offscreen.Dispose()
}
offscreen, err := NewImage(screenWidth, screenHeight, FilterNearest)
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if err != nil {
return err
}
intScreenScale := int(math.Ceil(screenScale))
w := screenWidth * intScreenScale
h := screenHeight * intScreenScale
offscreen2, err := NewImage(w, h, FilterLinear)
if err != nil {
return err
}
w = int(float64(screenWidth) * screenScale)
h = int(float64(screenHeight) * screenScale)
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c.screen, err = newImageWithScreenFramebuffer(w, h)
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if err != nil {
return err
}
c.screen.Clear()
c.offscreen = offscreen
c.offscreen2 = offscreen2
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c.screenScale = screenScale
ui.GLContext().ResetViewportSize()
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return nil
}
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func (c *graphicsContext) needsRestoring(context *opengl.Context) (bool, error) {
imageM.Lock()
defer imageM.Unlock()
// FlushCommands is required because c.offscreen.impl might not have an actual texture.
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if err := graphics.FlushCommands(ui.GLContext()); err != nil {
return false, err
}
return c.offscreen.impl.isInvalidated(context), nil
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}
func (c *graphicsContext) initializeIfNeeded() error {
// glViewport must be called at every frame on iOS
ui.GLContext().ResetViewportSize()
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if !c.initialized {
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if err := graphics.Initialize(ui.GLContext()); err != nil {
return err
}
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c.initialized = true
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}
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r, err := c.needsRestoring(ui.GLContext())
if err != nil {
return err
}
if r {
if err := c.restore(); err != nil {
return err
}
}
return nil
}
func drawWithFittingScale(dst *Image, src *Image) error {
wd, hd := dst.Size()
ws, hs := src.Size()
sw := float64(wd) / float64(ws)
sh := float64(hd) / float64(hs)
op := &DrawImageOptions{}
op.GeoM.Scale(sw, sh)
if err := dst.DrawImage(src, op); err != nil {
return err
}
return nil
}
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func (c *graphicsContext) drawToDefaultRenderTarget() error {
if err := c.screen.Clear(); err != nil {
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return err
}
if err := drawWithFittingScale(c.screen, c.offscreen2); err != nil {
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return err
}
if err := c.flush(); err != nil {
return err
}
return nil
}
func (c *graphicsContext) UpdateAndDraw() error {
if err := c.initializeIfNeeded(); err != nil {
return err
}
if err := c.offscreen.Clear(); err != nil {
return err
}
if err := c.f(c.offscreen); err != nil {
return err
}
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if IsRunningSlowly() {
return nil
}
if err := c.offscreen2.Clear(); err != nil {
return err
}
if err := drawWithFittingScale(c.offscreen2, c.offscreen); err != nil {
return err
}
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if err := c.drawToDefaultRenderTarget(); err != nil {
return err
}
exceptions := map[*imageImpl]struct{}{
c.offscreen.impl: {},
c.offscreen2.impl: {},
c.screen.impl: {},
}
if err := theImages.savePixels(ui.GLContext(), exceptions); err != nil {
return err
}
return nil
}
func (c *graphicsContext) Draw() error {
if err := c.initializeIfNeeded(); err != nil {
return err
}
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if err := c.drawToDefaultRenderTarget(); err != nil {
return err
}
return nil
}
func (c *graphicsContext) flush() error {
// TODO: imageM is necessary to call graphics functions. Move this to graphics package.
imageM.Lock()
defer imageM.Unlock()
if err := graphics.FlushCommands(ui.GLContext()); err != nil {
return err
}
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// Call glFlush to prevent black flicking (especially on Android (#226) and iOS).
ui.GLContext().Flush()
return nil
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}
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func (c *graphicsContext) restore() error {
imageM.Lock()
defer imageM.Unlock()
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ui.GLContext().Resume()
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if err := graphics.Initialize(ui.GLContext()); err != nil {
return err
}
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if err := theImages.restorePixels(ui.GLContext()); err != nil {
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return err
}
return nil
}