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graphics: Bug fix: Mipmap was not invalidated at DrawTriangle

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Fixes #725
This commit is contained in:
Hajime Hoshi 2018-10-26 01:43:00 +09:00
parent 8b82667df1
commit d3bd858aba
2 changed files with 78 additions and 0 deletions
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1
image.go
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@ -474,6 +474,7 @@ func (i *Image) DrawTriangles(vertices []Vertex, indices []uint16, img *Image, o
vs = append(vs, src.Vertex(float32(v.DstX), float32(v.DstY), v.SrcX, v.SrcY, v.ColorR, v.ColorG, v.ColorB, v.ColorA)...)
}
i.mipmap.original().DrawImage(img.mipmap.original(), vs, indices, options.ColorM.impl, mode, filter)
i.disposeMipmaps()
}
// Bounds returns the bounds of the image.

77
image_test.go
View File

@ -946,3 +946,80 @@ func TestMipmapColor(t *testing.T) {
}
}
}
// Issue #725
func TestImageMiamapAndDrawTriangle(t *testing.T) {
img0, _ := NewImage(32, 32, FilterDefault)
img1, _ := NewImage(128, 128, FilterDefault)
img2, _ := NewImage(128, 128, FilterDefault)
// Fill img1 red and create img1's mipmap
img1.Fill(color.RGBA{0xff, 0, 0, 0xff})
op := &DrawImageOptions{}
op.GeoM.Scale(0.25, 0.25)
op.Filter = FilterLinear
img0.DrawImage(img1, op)
// Call DrawTriangle on img1 and fill it with green
img2.Fill(color.RGBA{0, 0xff, 0, 0xff})
vs := []Vertex{
{
DstX: 0,
DstY: 0,
SrcX: 0,
SrcY: 0,
ColorR: 1,
ColorG: 1,
ColorB: 1,
ColorA: 1,
},
{
DstX: 128,
DstY: 0,
SrcX: 128,
SrcY: 0,
ColorR: 1,
ColorG: 1,
ColorB: 1,
ColorA: 1,
},
{
DstX: 0,
DstY: 128,
SrcX: 0,
SrcY: 128,
ColorR: 1,
ColorG: 1,
ColorB: 1,
ColorA: 1,
},
{
DstX: 128,
DstY: 128,
SrcX: 128,
SrcY: 128,
ColorR: 1,
ColorG: 1,
ColorB: 1,
ColorA: 1,
},
}
img1.DrawTriangles(vs, []uint16{0, 1, 2, 1, 2, 3}, img2, nil)
// Draw img1 (green) again. Confirm mipmap is correctly updated.
img0.Clear()
op = &DrawImageOptions{}
op.GeoM.Scale(0.25, 0.25)
op.Filter = FilterLinear
img0.DrawImage(img1, op)
w, h := img0.Size()
for j := 0; j < h; j++ {
for i := 0; i < w; i++ {
c := img0.At(i, j).(color.RGBA)
if c.R != 0 {
t.Errorf("img0.At(%d, %d): red want %d got %d", i, j, 0, c.R)
}
}
}
}