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graphics: Remove one bound check from fragment shader (#461)

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This commit is contained in:
Hajime Hoshi 2017-12-16 01:27:30 +09:00
parent 654a88c140
commit d6878d6887
3 changed files with 25 additions and 3 deletions
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3
image.go
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@ -140,6 +140,9 @@ func (i *Image) DrawImage(img *Image, options *DrawImageOptions) error {
}
}
vs := vertices(sx0, sy0, sx1, sy1, w, h, &options.GeoM.impl)
if vs == nil {
return nil
}
mode := opengl.CompositeMode(options.CompositeMode)
i.restorable.DrawImage(img.restorable, vs, &options.ColorM.impl, mode)
return nil

3
internal/graphics/shader.go
View File

@ -83,9 +83,6 @@ highp vec2 roundTexel(highp vec2 p) {
}
vec4 getColorAt(highp vec2 pos) {
if (pos.x < 0.0 || pos.y < 0.0) {
return vec4(0, 0, 0, 0);
}
if (pos.x < varying_tex_coord_min.x ||
pos.y < varying_tex_coord_min.y ||
varying_tex_coord_max.x <= pos.x ||

22
vertices.go
View File

@ -47,8 +47,30 @@ func vertices(sx0, sy0, sx1, sy1 int, width, height int, geo *affine.GeoM) []flo
if sx0 >= sx1 || sy0 >= sy1 {
return nil
}
if sx1 <= 0 || sy1 <= 0 {
return nil
}
// TODO: This function should be in graphics package?
vs := theVerticesBackend.get()
if sx0 < 0 || sy0 < 0 {
dx := 0.0
dy := 0.0
if sx0 < 0 {
dx = -float64(sx0)
sx0 = 0
}
if sy0 < 0 {
dy = -float64(sy0)
sy0 = 0
}
g := affine.GeoM{}
g.Translate(dx, dy)
g.Concat(geo)
geo = &g
}
a, b, c, d, tx, ty := geo.Elements()
g0 := float32(a)
g1 := float32(b)