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38 lines
1.1 KiB
Go
38 lines
1.1 KiB
Go
//go:build js
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package webgl2
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import (
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"bytes"
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"syscall/js"
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"aego/core/mathx"
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"aego/gpu/internal/glstate"
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)
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// The caller redraws this 8×8 tile with the reference resolve if the clear differs.
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func (d *Device) MatchWindowClear(x, y int, color mathx.Color) bool {
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b := &d.bb
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if d.lost || b.fbo == 0 || x < 0 || y < 0 || x+8 > b.w || y+8 > b.h {
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return false
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}
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y = b.h - y - 8
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var before, after [8 * 8 * 4]byte
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d.cache.BindFramebuffer(b.fbo)
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d.call(d.f.ReadBuffer, glColorAttachment0)
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d.call(d.f.PixelStorei, glPackAlignment, 1)
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read := func(dst []byte) bool {
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jsBuf := d.scratch(len(dst))
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d.call(d.f.ReadPixels, x, y, 8, 8, glRGBA, glUnsignedByte, jsBuf, 0)
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return num(d.call(d.f.GetError)) == glNoError && js.CopyBytesToGo(dst, jsBuf) == len(dst)
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}
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if !read(before[:]) {
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return false
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}
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d.cache.SetScissor(true, glstate.Rect{X: int32(x), Y: int32(y), W: 8, H: 8})
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d.call(d.f.ClearColor, color.R, color.G, color.B, color.A)
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d.call(d.f.Clear, glColorBufferBit)
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d.cache.SetScissor(false, glstate.Rect{})
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return read(after[:]) && bytes.Equal(before[:], after[:])
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}
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