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"
"sync/atomic"
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"github.com/hajimehoshi/ebiten/internal/graphics"
"github.com/hajimehoshi/ebiten/internal/opengl"
"github.com/hajimehoshi/ebiten/internal/restorable"
"github.com/hajimehoshi/ebiten/internal/ui"
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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
offscreen2 *Image // TODO: better name
screen *Image
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screenScale float64
initialized int32
invalidated bool // browser only
}
func (c *graphicsContext) GLContext() *opengl.Context {
if atomic.LoadInt32(&c.initialized) == 0 {
return nil
}
return ui.GLContext()
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}
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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
}
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func (c *graphicsContext) SetSize(screenWidth, screenHeight int, screenScale float64) error {
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if c.screen != nil {
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if err := c.screen.Dispose(); err != nil {
return err
}
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}
if c.offscreen != nil {
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if err := c.offscreen.Dispose(); err != nil {
return err
}
}
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if c.offscreen2 != nil {
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if err := c.offscreen2.Dispose(); err != nil {
return err
}
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}
offscreen, err := newVolatileImage(screenWidth, screenHeight, FilterNearest)
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if err != nil {
return err
}
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intScreenScale := int(math.Ceil(screenScale))
w := screenWidth * intScreenScale
h := screenHeight * intScreenScale
offscreen2, err := newVolatileImage(w, h, FilterLinear)
if err != nil {
return err
}
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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
}
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if err := c.screen.Clear(); err != nil {
return err
}
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c.offscreen = offscreen
c.offscreen2 = offscreen2
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c.screenScale = screenScale
return nil
}
func (c *graphicsContext) initializeIfNeeded(context *opengl.Context) error {
if atomic.LoadInt32(&c.initialized) == 0 {
if err := graphics.Reset(context); err != nil {
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return err
}
atomic.StoreInt32(&c.initialized, 1)
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}
r, err := c.needsRestoring(context)
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if err != nil {
return err
}
if !r {
return nil
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}
if err := c.restore(context); 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
}
func (c *graphicsContext) drawToDefaultRenderTarget(context *opengl.Context) 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 := graphics.FlushCommands(context); err != nil {
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return err
}
return nil
}
func (c *graphicsContext) UpdateAndDraw(context *opengl.Context, updateCount int) error {
if err := c.initializeIfNeeded(context); err != nil {
return err
}
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if err := restorable.ResolveStalePixels(context); err != nil {
return err
}
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for i := 0; i < updateCount; i++ {
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restorable.ClearVolatileImages()
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setRunningSlowly(i < updateCount-1)
if err := c.f(c.offscreen); err != nil {
return err
}
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}
if 0 < updateCount {
if err := drawWithFittingScale(c.offscreen2, c.offscreen); err != nil {
return err
}
}
if err := c.drawToDefaultRenderTarget(context); err != nil {
return err
}
return nil
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}
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func (c *graphicsContext) restore(context *opengl.Context) error {
if err := graphics.Reset(context); err != nil {
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return err
}
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if err := restorable.Restore(context); err != nil {
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return err
}
c.invalidated = false
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return nil
}