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graphicsdriver/opengl: Use glBufferSubData instead of glMapBuffer
We have confirmed that this does not slow down ReplacePixels. Fixes #993 Fixes #1040
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@ -548,22 +548,19 @@ func (c *context) newPixelBufferObject(width, height int) buffer {
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return bf
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return bf
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}
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}
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func (c *context) mapPixelBuffer(buffer buffer) uintptr {
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func (c *context) replacePixelsWithPBO(buffer buffer, t textureNative, width, height int, args []*driver.ReplacePixelsArgs) {
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var ptr uintptr
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_ = c.t.Call(func() error {
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gl.BindBuffer(gl.PIXEL_UNPACK_BUFFER, uint32(buffer))
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// Even though the buffer is partly updated, GL_WRITE_ONLY is fine.
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// https://stackoverflow.com/questions/30248594/write-only-glmapbuffer-what-if-i-dont-write-it-all
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ptr = gl.MapBuffer(gl.PIXEL_UNPACK_BUFFER, gl.WRITE_ONLY)
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return nil
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})
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return ptr
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}
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func (c *context) unmapPixelBuffer(buffer buffer, t textureNative, width, height int) {
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c.bindTexture(t)
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c.bindTexture(t)
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_ = c.t.Call(func() error {
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_ = c.t.Call(func() error {
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gl.UnmapBuffer(gl.PIXEL_UNPACK_BUFFER)
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gl.BindBuffer(gl.PIXEL_UNPACK_BUFFER, uint32(buffer))
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stride := 4 * width
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for _, a := range args {
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offset := 4 * (a.Y*width + a.X)
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for j := 0; j < a.Height; j++ {
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gl.BufferSubData(gl.PIXEL_UNPACK_BUFFER, offset+stride*j, 4*a.Width, gl.Ptr(a.Pixels[4*a.Width*j:4*a.Width*(j+1)]))
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}
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}
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gl.TexSubImage2D(gl.TEXTURE_2D, 0, 0, 0, int32(width), int32(height), gl.RGBA, gl.UNSIGNED_BYTE, nil)
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gl.TexSubImage2D(gl.TEXTURE_2D, 0, 0, 0, int32(width), int32(height), gl.RGBA, gl.UNSIGNED_BYTE, nil)
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gl.BindBuffer(gl.PIXEL_UNPACK_BUFFER, 0)
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gl.BindBuffer(gl.PIXEL_UNPACK_BUFFER, 0)
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return nil
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return nil
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@ -20,9 +20,6 @@
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package opengl
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package opengl
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import (
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import (
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"reflect"
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"unsafe"
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"github.com/hajimehoshi/ebiten/internal/driver"
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"github.com/hajimehoshi/ebiten/internal/driver"
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)
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)
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@ -37,23 +34,5 @@ func drawPixelsWithPBO(img *Image, args []*driver.ReplacePixelsArgs) {
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panic("opengl: newPixelBufferObject failed")
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panic("opengl: newPixelBufferObject failed")
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}
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}
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mappedPBO := img.driver.context.mapPixelBuffer(img.pbo)
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img.driver.context.replacePixelsWithPBO(img.pbo, img.textureNative, w, h, args)
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if 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 = mappedPBO
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sh.Len = 4 * w * h
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sh.Cap = 4 * w * h
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for _, a := range args {
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stride := 4 * w
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offset := 4 * (a.Y*w + a.X)
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for j := 0; j < a.Height; j++ {
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copy(mapped[offset+stride*j:offset+stride*j+4*a.Width], a.Pixels[4*a.Width*j:4*a.Width*(j+1)])
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}
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}
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img.driver.context.unmapPixelBuffer(img.pbo, img.textureNative, w, h)
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}
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}
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