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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
88 lines
2.1 KiB
Go
88 lines
2.1 KiB
Go
// Copyright 2019 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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// +build darwin freebsd linux windows
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// +build !js
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// +build !android
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// +build !ios
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package opengl
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import (
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"reflect"
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"runtime"
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"unsafe"
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"github.com/hajimehoshi/ebiten/internal/graphics"
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)
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const canUsePBO = true
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type pboState struct {
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image *Image
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mappedPBO unsafe.Pointer
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}
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var thePBOState pboState
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func (s *pboState) mapPBOIfNecessary(img *Image) {
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if s.image == img {
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return
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}
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s.ensurePBOUnmapped()
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if img.pbo == *new(buffer) {
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w, h := graphics.InternalImageSize(img.width), graphics.InternalImageSize(img.height)
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img.pbo = img.driver.context.newPixelBufferObject(w, h)
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}
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s.image = img
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s.mappedPBO = img.driver.context.mapPixelBuffer(img.pbo)
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if s.mappedPBO == nil {
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panic("opengl: mapPixelBuffer failed")
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}
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}
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func (s *pboState) draw(pix []byte, x, y, width, height int) {
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w, h := graphics.InternalImageSize(s.image.width), graphics.InternalImageSize(s.image.height)
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var mapped []byte
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sh := (*reflect.SliceHeader)(unsafe.Pointer(&mapped))
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sh.Data = uintptr(s.mappedPBO)
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sh.Len = 4 * w * h
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sh.Cap = 4 * w * h
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stride := 4 * w
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offset := 4 * (y*w + x)
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for j := 0; j < height; j++ {
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copy(mapped[offset+stride*j:offset+stride*j+4*width], pix[4*width*j:4*width*(j+1)])
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}
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runtime.KeepAlive(mapped)
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}
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func (s *pboState) ensurePBOUnmapped() {
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if s.mappedPBO == nil {
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return
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}
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i := s.image
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w, h := graphics.InternalImageSize(i.width), graphics.InternalImageSize(i.height)
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i.driver.context.unmapPixelBuffer(i.pbo, i.textureNative, w, h)
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s.image = nil
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s.mappedPBO = nil
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}
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