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gpu: add linear gradient

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Signed-off-by: Egon Elbre <egonelbre@gmail.com>
This commit is contained in:
Egon Elbre
2020-11-01 21:21:19 +02:00
committed by Elias Naur
parent 0641a34b24
commit f00f3a3359
10 changed files with 452 additions and 71 deletions
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gpu/path.go
+30 -10
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@@ -27,11 +27,12 @@ type pather struct {
}
type coverer struct {
ctx backend.Device
prog [2]*program
texUniforms *coverTexUniforms
colUniforms *coverColUniforms
layout backend.InputLayout
ctx backend.Device
prog [3]*program
texUniforms *coverTexUniforms
colUniforms *coverColUniforms
linearGradientUniforms *coverLinearGradientUniforms
layout backend.InputLayout
}
type coverTexUniforms struct {
@@ -51,6 +52,16 @@ type coverColUniforms struct {
}
}
type coverLinearGradientUniforms struct {
vert struct {
coverUniforms
_ [12]byte // Padding to multiple of 16.
}
frag struct {
gradientUniforms
}
}
type coverUniforms struct {
transform [4]float32
uvCoverTransform [4]float32
@@ -149,9 +160,10 @@ func newCoverer(ctx backend.Device) *coverer {
}
c.colUniforms = new(coverColUniforms)
c.texUniforms = new(coverTexUniforms)
c.linearGradientUniforms = new(coverLinearGradientUniforms)
prog, layout, err := createColorPrograms(ctx, shader_cover_vert, shader_cover_frag,
[2]interface{}{&c.colUniforms.vert, &c.texUniforms.vert},
[2]interface{}{&c.colUniforms.frag, nil},
[3]interface{}{&c.colUniforms.vert, &c.linearGradientUniforms.vert, &c.texUniforms.vert},
[3]interface{}{&c.colUniforms.frag, &c.linearGradientUniforms.frag, nil},
)
if err != nil {
panic(err)
@@ -362,11 +374,11 @@ func (s *stenciler) stencilPath(bounds image.Rectangle, offset f32.Point, uv ima
}
}
func (p *pather) cover(z float32, mat materialType, col f32color.RGBA, scale, off f32.Point, uvTrans f32.Affine2D, coverScale, coverOff f32.Point) {
p.coverer.cover(z, mat, col, scale, off, uvTrans, coverScale, coverOff)
func (p *pather) cover(z float32, mat materialType, col f32color.RGBA, col1, col2 f32color.RGBA, scale, off f32.Point, uvTrans f32.Affine2D, coverScale, coverOff f32.Point) {
p.coverer.cover(z, mat, col, col1, col2, scale, off, uvTrans, coverScale, coverOff)
}
func (c *coverer) cover(z float32, mat materialType, col f32color.RGBA, scale, off f32.Point, uvTrans f32.Affine2D, coverScale, coverOff f32.Point) {
func (c *coverer) cover(z float32, mat materialType, col f32color.RGBA, col1, col2 f32color.RGBA, scale, off f32.Point, uvTrans f32.Affine2D, coverScale, coverOff f32.Point) {
p := c.prog[mat]
c.ctx.BindProgram(p.prog)
var uniforms *coverUniforms
@@ -374,6 +386,14 @@ func (c *coverer) cover(z float32, mat materialType, col f32color.RGBA, scale, o
case materialColor:
c.colUniforms.frag.color = col
uniforms = &c.colUniforms.vert.coverUniforms
case materialLinearGradient:
c.linearGradientUniforms.frag.color1 = col1
c.linearGradientUniforms.frag.color2 = col2
t1, t2, t3, t4, t5, t6 := uvTrans.Elems()
c.linearGradientUniforms.vert.uvTransformR1 = [4]float32{t1, t2, t3, 0}
c.linearGradientUniforms.vert.uvTransformR2 = [4]float32{t4, t5, t6, 0}
uniforms = &c.linearGradientUniforms.vert.coverUniforms
case materialTexture:
t1, t2, t3, t4, t5, t6 := uvTrans.Elems()
c.texUniforms.vert.uvTransformR1 = [4]float32{t1, t2, t3, 0}