func fill(canv *Canvas, alphaTex *glh.Texture, paint *Paint) {
gGl.GlColorConfig.SetColor(paint.fillColor)
defer gGl.GlColorConfig.Reset()
gGl.Activate(gGl.FillDrawer)
gl.ColorMask(true, true, true, true)
gl.StencilMask(0x3)
gl.StencilFunc(gl.LESS, 0, 0xff)
w, h := canv.W, canv.H
p := canv.toGLPoints([]Point{
iPt(0, 0),
iPt(w, 0),
iPt(w, h),
iPt(0, h),
})
vertices := []float32{
p[0].X, p[0].Y, 0, 1,
p[1].X, p[1].Y, 1, 1,
p[2].X, p[2].Y, 1, 0,
p[3].X, p[3].Y, 0, 0,
}
gl.BufferData(gl.ARRAY_BUFFER, len(vertices)*4, vertices, gl.STATIC_DRAW)
elements := []uint32{
0, 1, 2,
2, 3, 0,
}
gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, len(elements)*4, elements, gl.STATIC_DRAW)
glh.With(alphaTex, func() {
gl.DrawElements(gl.TRIANGLES, 6, gl.UNSIGNED_INT, nil)
})
}
func (p *Path) draw(canv *Canvas, alphaBuffer *glh.Framebuffer, clrStencil bool) {
gGl.QuadraticDrawConfig.SetExcludeTransluFrags(false)
glh.With(alphaBuffer, func() {
gl.ClearColor(0, 0, 0, 0)
gl.Clear(gl.COLOR_BUFFER_BIT)
p.glDraw(canv)
})
if clrStencil {
gl.StencilMask(0x3)
gl.ClearStencil(0x0)
gl.Clear(gl.STENCIL_BUFFER_BIT)
}
gl.ColorMask(false, false, false, false)
gl.StencilMask(0x3)
gl.StencilFunc(gl.ALWAYS, 0, 0xff)
gl.StencilOp(gl.KEEP, gl.KEEP, gl.INVERT)
p.glDraw(canv)
gl.StencilMask(0x1)
gGl.QuadraticDrawConfig.SetExcludeTransluFrags(true)
p.glDraw(canv)
}