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https://github.com/hajimehoshi/ebiten.git
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acc933b7c3
This change is an experimental implementation to use Pixel Buffer Objects. This reduces calls of glTexSubImage2D. This works only on desktops. Unfortunately WebGL does not have this features. Mobiles can have PBO as of OpenGL ES 3. Updates #976
117 lines
3.0 KiB
Go
117 lines
3.0 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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"github.com/hajimehoshi/ebiten/internal/graphics"
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)
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type Image struct {
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driver *Driver
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textureNative textureNative
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framebuffer *framebuffer
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pbo buffer
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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) IsInvalidated() bool {
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return !i.driver.context.isTexture(i.textureNative)
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}
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func (i *Image) Dispose() {
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thePBOState.ensurePBOUnmapped()
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if i.pbo != *new(buffer) {
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i.driver.context.deleteBuffer(i.pbo)
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}
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if i.framebuffer != nil {
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i.framebuffer.delete(&i.driver.context)
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}
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if i.textureNative != *new(textureNative) {
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i.driver.context.deleteTexture(i.textureNative)
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}
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}
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func (i *Image) SetAsDestination() {
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i.driver.state.destination = 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.driver.context.setViewport(i.framebuffer)
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return nil
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}
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func (i *Image) Pixels() ([]byte, error) {
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thePBOState.ensurePBOUnmapped()
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if err := i.ensureFramebuffer(); err != nil {
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return nil, err
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}
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p, err := i.driver.context.framebufferPixels(i.framebuffer, i.width, i.height)
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if err != nil {
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return nil, err
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}
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return p, nil
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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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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, c.width and c.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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i.framebuffer = newScreenFramebuffer(&i.driver.context, i.width, i.height)
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return nil
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}
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w, h := graphics.InternalImageSize(i.width), graphics.InternalImageSize(i.height)
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f, err := newFramebufferFromTexture(&i.driver.context, i.textureNative, 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) ReplacePixels(p []byte, x, y, width, height int) {
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if i.screen {
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panic("opengl: ReplacePixels cannot be called on the screen, that doesn't have a texture")
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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.driver.drawCalled {
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i.driver.context.flush()
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}
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i.driver.drawCalled = false
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if canUsePBO {
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thePBOState.mapPBOIfNecessary(i)
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thePBOState.draw(p, x, y, width, height)
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} else {
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i.driver.context.texSubImage2D(i.textureNative, p, x, y, width, height)
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}
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}
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func (i *Image) SetAsSource() {
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i.driver.state.source = i
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}
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