mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-25 11:18:54 +01:00
140 lines
3.4 KiB
Go
140 lines
3.4 KiB
Go
// Copyright 2018 The Ebiten Authors
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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 opengl
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import (
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"errors"
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"github.com/hajimehoshi/ebiten/v2/internal/graphics"
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"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver"
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)
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type Image struct {
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id graphicsdriver.ImageID
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graphics *Graphics
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texture textureNative
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stencil renderbufferNative
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framebuffer *framebuffer
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width int
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height int
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screen bool
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}
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func (i *Image) ID() graphicsdriver.ImageID {
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return i.id
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}
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func (i *Image) IsInvalidated() bool {
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return !i.graphics.context.isTexture(i.texture)
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}
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func (i *Image) Dispose() {
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if i.framebuffer != nil {
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i.framebuffer.delete(&i.graphics.context)
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}
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if !i.texture.equal(*new(textureNative)) {
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i.graphics.context.deleteTexture(i.texture)
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}
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if !i.stencil.equal(*new(renderbufferNative)) {
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i.graphics.context.deleteRenderbuffer(i.stencil)
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}
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i.graphics.removeImage(i)
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}
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func (i *Image) setViewport() error {
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if err := i.ensureFramebuffer(); err != nil {
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return err
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}
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i.graphics.context.setViewport(i.framebuffer)
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return nil
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}
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func (i *Image) ReadPixels(buf []byte) error {
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if err := i.ensureFramebuffer(); err != nil {
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return err
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}
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i.graphics.context.framebufferPixels(buf, i.framebuffer, i.width, i.height)
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return nil
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}
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func (i *Image) framebufferSize() (int, int) {
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if i.screen {
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// The (default) framebuffer size can't be converted to a power of 2.
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// On browsers, i.width and i.height are used as viewport size and
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// Edge can't treat a bigger viewport than the drawing area (#71).
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return i.width, i.height
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}
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return graphics.InternalImageSize(i.width), graphics.InternalImageSize(i.height)
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}
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func (i *Image) ensureFramebuffer() error {
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if i.framebuffer != nil {
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return nil
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}
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w, h := i.framebufferSize()
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if i.screen {
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i.framebuffer = newScreenFramebuffer(&i.graphics.context, w, h)
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return nil
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}
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f, err := newFramebufferFromTexture(&i.graphics.context, i.texture, w, h)
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if err != nil {
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return err
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}
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i.framebuffer = f
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return nil
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}
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func (i *Image) ensureStencilBuffer() error {
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if !i.stencil.equal(*new(renderbufferNative)) {
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return nil
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}
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if err := i.ensureFramebuffer(); err != nil {
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return err
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}
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r, err := i.graphics.context.newRenderbuffer(i.framebufferSize())
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if err != nil {
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return err
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}
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i.stencil = r
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if err := i.graphics.context.bindStencilBuffer(i.framebuffer.native, i.stencil); 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 (i *Image) WritePixels(args []*graphicsdriver.WritePixelsArgs) error {
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if i.screen {
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return errors.New("opengl: WritePixels cannot be called on the screen")
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}
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if len(args) == 0 {
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return nil
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}
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// glFlush is necessary on Android.
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// glTexSubImage2D didn't work without this hack at least on Nexus 5x and NuAns NEO [Reloaded] (#211).
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if i.graphics.drawCalled {
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i.graphics.context.flush()
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}
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i.graphics.drawCalled = false
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i.graphics.context.texSubImage2D(i.texture, args)
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return nil
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}
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