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graphics: Bug fix: wrong texels were used (#546)

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This commit is contained in:
Hajime Hoshi 2018-03-11 03:02:03 +09:00
parent b474946619
commit efea65ee58
2 changed files with 34 additions and 23 deletions
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51
image_test.go
View File

@ -545,30 +545,41 @@ func TestImageEdge(t *testing.T) {
}
}
img0.ReplacePixels(pixels)
img1, _ := NewImage(img1Width, img1Height, FilterNearest)
img1, _ := NewImage(img1Width, img1Height, FilterDefault)
red := color.RGBA{0xff, 0, 0, 0xff}
transparent := color.RGBA{0, 0, 0, 0}
for a := 0; a < 360; a += 5 {
img1.Clear()
op := &DrawImageOptions{}
w, h := img0.Size()
r := image.Rect(0, 0, w, h/2)
op.SourceRect = &r
op.GeoM.Translate(-float64(img0Width)/2, -float64(img0Height)/2)
op.GeoM.Rotate(float64(a) * math.Pi / 180)
op.GeoM.Translate(img1Width/2, img1Height/2)
img1.DrawImage(img0, op)
for j := 0; j < img1Height; j++ {
for i := 0; i < img1Width; i++ {
c := img1.At(i, j)
if c == red {
continue
for _, f := range []Filter{FilterNearest, FilterLinear} {
for a := 0; a < 360; a += 5 {
img1.Clear()
op := &DrawImageOptions{}
w, h := img0.Size()
r := image.Rect(0, 0, w, h/2)
op.SourceRect = &r
op.GeoM.Translate(-float64(img0Width)/2, -float64(img0Height)/2)
op.GeoM.Rotate(float64(a) * math.Pi / 180)
op.GeoM.Translate(img1Width/2, img1Height/2)
op.Filter = f
img1.DrawImage(img0, op)
for j := 0; j < img1Height; j++ {
for i := 0; i < img1Width; i++ {
c := img1.At(i, j)
if c == transparent {
continue
}
switch f {
case FilterNearest:
if c == red {
continue
}
case FilterLinear:
_, g, b, _ := c.RGBA()
if g == 0 && b == 0 {
continue
}
}
t.Errorf("img1.At(%d, %d) (filter: %d, angle: %d) want: red or transparent, got: %v", i, j, f, a, c)
}
if c == transparent {
continue
}
t.Errorf("img1.At(%d, %d) (angle: %d) want: red or transparent, got: %v", i, j, a, c)
}
}
}

6
internal/graphics/shader.go
View File

@ -114,8 +114,8 @@ void main(void) {
pos = roundTexel(pos);
highp vec2 texel_size = 1.0 / source_size;
highp vec2 p0 = pos;
highp vec2 p1 = pos + texel_size;
highp vec2 p0 = pos - texel_size / 2.0;
highp vec2 p1 = pos + texel_size / 2.0;
vec4 c0 = texture2D(texture, p0);
vec4 c1 = texture2D(texture, vec2(p1.x, p0.y));
vec4 c2 = texture2D(texture, vec2(p0.x, p1.y));
@ -137,7 +137,7 @@ void main(void) {
c3 = vec4(0, 0, 0, 0);
}
vec2 rate = fract(pos * source_size);
vec2 rate = fract(p0 * source_size);
vec4 color = mix(mix(c0, c1, rate.x), mix(c2, c3, rate.x), rate.y);
#endif