mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-26 03:38:55 +01:00
166 lines
4.0 KiB
Go
166 lines
4.0 KiB
Go
// Copyright 2014 Hajime Hoshi
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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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"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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)
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func newGraphicsContext(f func(*Image) error) *graphicsContext {
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return &graphicsContext{
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f: f,
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}
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}
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type graphicsContext struct {
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f func(*Image) error
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offscreen *Image
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screen *Image
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screenScale int
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initialized bool
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}
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func (c *graphicsContext) SetSize(screenWidth, screenHeight, screenScale int) error {
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if c.screen != nil {
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c.screen.Dispose()
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}
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if c.offscreen != nil {
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c.offscreen.Dispose()
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}
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offscreen, err := NewImage(screenWidth, screenHeight, FilterNearest)
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if err != nil {
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return err
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}
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c.screen, err = newImageWithScreenFramebuffer(screenWidth*screenScale, screenHeight*screenScale)
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if err != nil {
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return err
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}
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c.screen.Clear()
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c.offscreen = offscreen
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c.screenScale = screenScale
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ui.GLContext().ResetViewportSize()
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return nil
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}
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func (c *graphicsContext) needsRestoring(context *opengl.Context) (bool, error) {
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imageM.Lock()
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defer imageM.Unlock()
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// 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 {
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return false, err
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}
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return c.offscreen.impl.isInvalidated(context), nil
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}
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func (c *graphicsContext) initializeIfNeeded() error {
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// glViewport must be called at every frame on iOS
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ui.GLContext().ResetViewportSize()
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if !c.initialized {
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if err := graphics.Initialize(ui.GLContext()); err != nil {
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return err
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}
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c.initialized = true
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}
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r, err := c.needsRestoring(ui.GLContext())
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if err != nil {
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return err
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}
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if r {
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if err := c.restore(); err != nil {
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return err
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}
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}
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return nil
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}
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func (c *graphicsContext) drawToDefaultRenderTarget() error {
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if err := c.screen.Clear(); err != nil {
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return err
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}
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scale := float64(c.screenScale)
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options := &DrawImageOptions{}
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options.GeoM.Scale(scale, scale)
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if err := c.screen.DrawImage(c.offscreen, options); err != nil {
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return err
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}
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if err := c.flush(); err != nil {
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return err
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}
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return nil
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}
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func (c *graphicsContext) UpdateAndDraw() error {
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if err := c.initializeIfNeeded(); err != nil {
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return err
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}
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if err := c.offscreen.Clear(); err != nil {
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return err
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}
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if err := c.f(c.offscreen); err != nil {
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return err
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}
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if IsRunningSlowly() {
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return nil
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}
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if err := c.drawToDefaultRenderTarget(); err != nil {
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return err
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}
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exceptions := map[*imageImpl]struct{}{
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c.offscreen.impl: {},
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c.screen.impl: {},
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}
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if err := theImages.savePixels(ui.GLContext(), exceptions); err != nil {
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return err
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}
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return nil
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}
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func (c *graphicsContext) Draw() error {
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if err := c.initializeIfNeeded(); err != nil {
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return err
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}
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if err := c.drawToDefaultRenderTarget(); err != nil {
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return err
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}
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return nil
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}
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func (c *graphicsContext) flush() error {
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// TODO: imageM is necessary to call graphics functions. Move this to graphics package.
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imageM.Lock()
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defer imageM.Unlock()
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if err := graphics.FlushCommands(ui.GLContext()); err != nil {
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return err
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}
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// Call glFlush to prevent black flicking (especially on Android (#226)).
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ui.GLContext().Flush()
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return nil
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}
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func (c *graphicsContext) restore() error {
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imageM.Lock()
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defer imageM.Unlock()
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ui.GLContext().Resume()
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if err := graphics.Initialize(ui.GLContext()); err != nil {
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return err
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}
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if err := theImages.restorePixels(ui.GLContext()); err != nil {
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return err
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}
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return nil
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}
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