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much better shadow performance

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This commit is contained in:
Thomas Friedel 2020-02-12 11:24:00 +01:00
parent 8b79ad18fa
commit 7213b3edcd
1 changed files with 32 additions and 16 deletions
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48
backend/goglbackend/fill.go
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@ -158,7 +158,7 @@ func (b *GoGLBackend) Fill(style *backendbase.FillStyle, pts [][2]float64, canOv
}
if style.Blur > 0 {
b.drawBlurred(style.Blur)
b.drawBlurred(style.Blur, min, max)
}
}
@ -220,18 +220,43 @@ func (b *GoGLBackend) FillImageMask(style *backendbase.FillStyle, mask *image.Al
gl.ActiveTexture(gl.TEXTURE0)
if style.Blur > 0 {
b.drawBlurred(style.Blur)
min, max := extent(pts[:])
b.drawBlurred(style.Blur, min, max)
}
}
func (b *GoGLBackend) drawBlurred(size float64) {
func (b *GoGLBackend) drawBlurred(size float64, min, max vec) {
b.offscr1.alpha = true
b.offscr2.alpha = true
// calculate box blur size
fsize := math.Max(1, math.Floor(size))
sizea := int(fsize)
sizeb := sizea
sizec := sizea
if size-fsize > 0.333333333 {
sizeb++
}
if size-fsize > 0.666666666 {
sizec++
}
min[0] -= fsize * 3
min[1] -= fsize * 3
max[0] += fsize * 3
max[1] += fsize * 3
gl.BindBuffer(gl.ARRAY_BUFFER, b.shadowBuf)
data := [16]float32{
0, 0, 0, float32(b.h), float32(b.w), float32(b.h), float32(b.w), 0,
0, 1, 0, 0, 1, 0, 1, 1}
float32(min[0]), float32(min[1]),
float32(min[0]), float32(max[1]),
float32(max[0]), float32(max[1]),
float32(max[0]), float32(min[1]),
float32(min[0] / b.fw), 1 - float32(min[1]/b.fh),
float32(min[0] / b.fw), 1 - float32(max[1]/b.fh),
float32(max[0] / b.fw), 1 - float32(max[1]/b.fh),
float32(max[0] / b.fw), 1 - float32(min[1]/b.fh),
}
gl.BufferData(gl.ARRAY_BUFFER, len(data)*4, unsafe.Pointer(&data[0]), gl.STREAM_DRAW)
gl.UseProgram(b.shd.ID)
@ -249,20 +274,11 @@ func (b *GoGLBackend) drawBlurred(size float64) {
gl.ActiveTexture(gl.TEXTURE0)
// calculate box blur size
fsize := math.Max(1, math.Floor(size))
sizea := int(fsize)
sizeb := sizea
sizec := sizea
if size-fsize > 0.333333333 {
sizeb++
}
if size-fsize > 0.666666666 {
sizec++
}
gl.ClearColor(0, 0, 0, 0)
gl.BindTexture(gl.TEXTURE_2D, b.offscr1.tex)
b.enableTextureRenderTarget(&b.offscr2)
gl.Clear(gl.COLOR_BUFFER_BIT)
b.box3(sizea, false)
gl.BindTexture(gl.TEXTURE_2D, b.offscr2.tex)
b.enableTextureRenderTarget(&b.offscr1)