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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 (
"github.com/hajimehoshi/ebiten/internal/graphics"
)
type Image struct {
driver *Driver
textureNative textureNative
framebuffer *framebuffer
width int
height int
screen bool
}
func (i *Image) IsInvalidated() bool {
return !i.driver.context.isTexture(i.textureNative)
}
func (i *Image) Dispose() {
if i.framebuffer != nil {
i.framebuffer.delete(&i.driver.context)
}
if i.textureNative != *new(textureNative) {
i.driver.context.deleteTexture(i.textureNative)
}
}
func (i *Image) SetAsDestination() {
i.driver.state.destination = i
}
func (i *Image) setViewport() error {
if err := i.ensureFramebuffer(); err != nil {
return err
}
i.driver.context.setViewport(i.framebuffer)
return nil
}
func (i *Image) Pixels() ([]byte, error) {
if err := i.ensureFramebuffer(); err != nil {
return nil, err
}
p, err := i.driver.context.framebufferPixels(i.framebuffer, i.width, i.height)
if err != nil {
return nil, err
}
return p, nil
}
func (i *Image) ensureFramebuffer() error {
if i.framebuffer != nil {
return nil
}
if i.screen {
// The (default) framebuffer size can't be converted to a power of 2.
// On browsers, c.width and c.height are used as viewport size and
// Edge can't treat a bigger viewport than the drawing area (#71).
i.framebuffer = newScreenFramebuffer(&i.driver.context, i.width, i.height)
return nil
}
w, h := graphics.InternalImageSize(i.width), graphics.InternalImageSize(i.height)
f, err := newFramebufferFromTexture(&i.driver.context, i.textureNative, w, h)
if err != nil {
return err
}
i.framebuffer = f
return nil
}
func (i *Image) ReplacePixels(p []byte, x, y, width, height int) {
if i.screen {
panic("opengl: ReplacePixels cannot be called on the screen, that doesn't have a texture")
}
// glFlush is necessary on Android.
// glTexSubImage2D didn't work without this hack at least on Nexus 5x and NuAns NEO [Reloaded] (#211).
i.driver.context.flush()
i.driver.context.texSubImage2D(i.textureNative, p, x, y, width, height)
}
func (i *Image) SetAsSource() {
i.driver.state.source = i
}
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