ebiten/internal/graphicsdriver/opengl/image.go

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// Copyright 2018 The Ebiten Authors
//
// 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.
package opengl
import (
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"github.com/hajimehoshi/ebiten/v2/internal/driver"
"github.com/hajimehoshi/ebiten/v2/internal/graphics"
)
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type Image struct {
id driver.ImageID
graphics *Graphics
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textureNative textureNative
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framebuffer *framebuffer
pbo buffer
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width int
height int
screen bool
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}
func (i *Image) ID() driver.ImageID {
return i.id
}
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func (i *Image) IsInvalidated() bool {
return !i.graphics.context.isTexture(i.textureNative)
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}
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func (i *Image) Dispose() {
if !i.pbo.equal(*new(buffer)) {
i.graphics.context.deleteBuffer(i.pbo)
}
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if i.framebuffer != nil {
i.framebuffer.delete(&i.graphics.context)
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}
if !i.textureNative.equal(*new(textureNative)) {
i.graphics.context.deleteTexture(i.textureNative)
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}
i.graphics.removeImage(i)
}
func (i *Image) setViewport() error {
if err := i.ensureFramebuffer(); err != nil {
return err
}
i.graphics.context.setViewport(i.framebuffer)
return nil
}
func (i *Image) Sync() <-chan struct{} {
// There is no way to sync the textures data on the system memory and GPU.
ch := make(chan struct{})
close(ch)
return ch
}
func (i *Image) Pixels() ([]byte, error) {
if err := i.ensureFramebuffer(); err != nil {
return nil, err
}
p := i.graphics.context.framebufferPixels(i.framebuffer, i.width, i.height)
return p, nil
}
func (i *Image) framebufferSize() (int, int) {
if i.screen {
// The (default) framebuffer size can't be converted to a power of 2.
// On browsers, i.width and i.height are used as viewport size and
// Edge can't treat a bigger viewport than the drawing area (#71).
return i.width, i.height
}
return graphics.InternalImageSize(i.width), graphics.InternalImageSize(i.height)
}
func (i *Image) ensureFramebuffer() error {
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if i.framebuffer != nil {
return nil
}
w, h := i.framebufferSize()
if i.screen {
i.framebuffer = newScreenFramebuffer(&i.graphics.context, w, h)
return nil
}
f, err := newFramebufferFromTexture(&i.graphics.context, i.textureNative, w, h)
if err != nil {
return err
}
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i.framebuffer = f
return nil
}
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func (i *Image) ReplacePixels(args []*driver.ReplacePixelsArgs) {
if i.screen {
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panic("opengl: ReplacePixels cannot be called on the screen, that doesn't have a texture")
}
if len(args) == 0 {
return
}
// glFlush is necessary on Android.
// glTexSubImage2D didn't work without this hack at least on Nexus 5x and NuAns NEO [Reloaded] (#211).
if i.graphics.drawCalled {
i.graphics.context.flush()
}
i.graphics.drawCalled = false
w, h := i.width, i.height
if !i.graphics.context.canUsePBO() {
i.graphics.context.texSubImage2D(i.textureNative, w, h, args)
return
}
if i.pbo.equal(*new(buffer)) {
i.pbo = i.graphics.context.newPixelBufferObject(w, h)
}
if i.pbo.equal(*new(buffer)) {
panic("opengl: newPixelBufferObject failed")
}
i.graphics.context.replacePixelsWithPBO(i.pbo, i.textureNative, w, h, args)
}