update Builder, keep working on beziers

forge/textsdf/glyph_test.go

@@ -0,0 +1,51 @@
+package textsdf
+
+import (
+	"testing"
+
+	"github.com/soypat/glgl/math/ms2"
+	"github.com/soypat/gsdf"
+)
+
+type glyph struct {
+}
+
+func TestABC(t *testing.T) {
+	bz := ms2.SplineBezier()
+	spline := []ms2.Vec{
+		{0, 0},
+		{1, 0},
+		{1, 0},
+		{1, 1},
+	}
+	// var points []ms2.Vec
+	var bld gsdf.Builder
+	var poly ms2.PolygonBuilder
+	circle := bld.NewCircle(0.1)
+	shape := bld.Translate2D(circle, spline[0].X, spline[1].Y)
+	for i := 0; i < len(spline); i += 4 {
+		v0, v1, v2, v3 := spline[4*i], spline[4*i+1], spline[4*i+2], spline[4*i+3]
+		shape = bld.Union2D(shape, bld.Translate2D(circle, v1.X, v1.Y))
+		shape = bld.Union2D(shape, bld.Translate2D(circle, v2.X, v2.Y))
+		for x := float32(0.0); x < 1; x += 1. / 64 {
+			vx := bz.Evaluate(x, v0, v1, v2, v3)
+			poly.Add(vx)
+
+		}
+	}
+	v, err := poly.AppendVecs(nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	shape = bld.Union2D(shape, bld.NewPolygon(v))
+	// _ = shape
+	// sdfcpu, err := gleval.NewCPUSDF2(shape)
+	// if err != nil {
+	// 	t.Fatal(err)
+	// }
+	// err = gsdfaux.RenderPNGFile("shape.png", sdfcpu, 512, nil)
+	// if err != nil {
+	// 	t.Fatal(err)
+	// }
+}

go.mod

@@ -7,7 +7,7 @@ require (
 	github.com/go-gl/gl v0.0.0-20231021071112-07e5d0ea2e71
 	github.com/go-gl/glfw/v3.3/glfw v0.0.0-20221017161538-93cebf72946b
 	github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0
-	github.com/soypat/glgl v0.0.0-20241019203012-a2ad2ed164c2
+	github.com/soypat/glgl v0.0.0-20241117161642-84ce0213c9ea
 )
 
 require (

go.sum

@@ -10,6 +10,8 @@ github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 h1:DACJavvAHhabrF0
 github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0/go.mod h1:E/TSTwGwJL78qG/PmXZO1EjYhfJinVAhrmmHX6Z8B9k=
 github.com/soypat/glgl v0.0.0-20241019203012-a2ad2ed164c2 h1:N/GkdilItOR9bBrGXIj+53DbxUzRnG1SF/aOkBQzlxs=
 github.com/soypat/glgl v0.0.0-20241019203012-a2ad2ed164c2/go.mod h1:1LcEp6XHSMCI91WlJHzl/aW4Bp5v6yQOiYFyjrlk350=
+github.com/soypat/glgl v0.0.0-20241117161642-84ce0213c9ea h1:bPlNmRe3fBJQPzqNWUN2ChFZJgGo+jk056+wpAzEX+w=
+github.com/soypat/glgl v0.0.0-20241117161642-84ce0213c9ea/go.mod h1:1LcEp6XHSMCI91WlJHzl/aW4Bp5v6yQOiYFyjrlk350=
 golang.org/x/exp v0.0.0-20221230185412-738e83a70c30 h1:m9O6OTJ627iFnN2JIWfdqlZCzneRO6EEBsHXI25P8ws=
 golang.org/x/exp v0.0.0-20221230185412-738e83a70c30/go.mod h1:CxIveKay+FTh1D0yPZemJVgC/95VzuuOLq5Qi4xnoYc=
 golang.org/x/image v0.22.0 h1:UtK5yLUzilVrkjMAZAZ34DXGpASN8i8pj8g+O+yd10g=

gsdf.go

@@ -21,22 +21,46 @@ const (
 	epstol = 6e-7
 )
 
+type Flags uint64
+
+const (
+	// FlagNoDimensionPanic controls panicking behavior on invalid shape dimension errors.
+	// If set then these errors do not panic, instead storing the error for later inspection with [Builder.Err].
+	FlagNoDimensionPanic Flags = 1 << iota
+)
+
 // Builder wraps all SDF primitive and operation logic generation.
 // Provides error handling strategies with panics or error accumulation during shape generation.
 type Builder struct {
-	NoDimensionPanic bool
-	accumErrs        []error
+	// flags is a bitfield controlling behaviour of Builder.
+	flags     Flags
+	accumErrs []error
+}
+
+func (bld *Builder) Flags() Flags {
+	return bld.flags
+}
+
+func (bld *Builder) SetFlags(flags Flags) error {
+	bld.flags = flags
+	return nil
 }
 
+// Err returns errors accumulated during SDF primitive creation and operations. The returned error implements `Unwrap() []error`.
 func (bld *Builder) Err() error {
 	if len(bld.accumErrs) == 0 {
 		return nil
 	}
 	return errors.Join(bld.accumErrs...)
 }
 
+// ClearErrors clears accumulated errors such that [Builder.Err] returns nil on next call.
+func (bld *Builder) ClearErrors() {
+	bld.accumErrs = bld.accumErrs[:0]
+}
+
 func (bld *Builder) shapeErrorf(msg string, args ...any) {
-	if !bld.NoDimensionPanic {
+	if bld.flags&FlagNoDimensionPanic == 0 {
 		panic(fmt.Sprintf(msg, args...))
 	}
 	// bld.stacks = append(bld.stacks, string(debug.Stack()))