mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 13:22:19 +02:00
74 lines
1.7 KiB
Go
74 lines
1.7 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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"unsafe"
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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 uintptr
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mapped []byte
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}
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var thePBOState pboState
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func (s *pboState) mapPBO(img *Image) {
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w, h := img.width, img.height
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if img.pbo == *new(buffer) {
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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, img.textureNative)
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if s.mappedPBO == 0 {
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panic("opengl: mapPixelBuffer failed")
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}
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var mapped []byte
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sh := (*reflect.SliceHeader)(unsafe.Pointer(&mapped))
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sh.Data = s.mappedPBO
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sh.Len = 4 * w * h
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sh.Cap = 4 * w * h
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s.mapped = mapped
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}
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func (s *pboState) draw(pix []byte, x, y, width, height int) {
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w := s.image.width
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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(s.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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}
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func (s *pboState) unmapPBO() {
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i := s.image
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i.driver.context.unmapPixelBuffer(i.pbo, i.width, i.height)
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s.image = nil
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s.mappedPBO = 0
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s.mapped = nil
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}
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