Testing for CPU on CI; font, ellipse, scale2D fixes

* fix CPU ellipse; fix GPU vec2 ssbo; add polyssbo/translatemulti2d; 87% test coverage;

* add gsdf.Builder to font config

* update README

* fix uninitialized Font crash; fix polygon self-closing case; admit multiple identical SSBOs; color conversion additions

* rewrite tests to run on CPU; add Scale2D CPU evaluator; bump glgl version

Author: soypat

cpu_evaluators.go

@@ -1078,3 +1078,26 @@ func (c *rotation2D) Evaluate(pos []ms2.Vec, dist []float32, userData any) error
 	err = sdf.Evaluate(posTransf, dist, userData)
 	return err
 }
+
+func (c *scale2D) Evaluate(pos []ms2.Vec, dist []float32, userData any) error {
+	sdf, err := gleval.AssertSDF2(c.s)
+	if err != nil {
+		return err
+	}
+	vp, err := gleval.GetVecPool(userData)
+	if err != nil {
+		return err
+	}
+	posTransf := vp.V2.Acquire(len(pos))
+	defer vp.V2.Release(posTransf)
+	invScale := 1. / c.scale
+	for i, p := range pos {
+		posTransf[i] = ms2.Scale(invScale, p)
+	}
+	err = sdf.Evaluate(posTransf, dist, userData)
+	scale := c.scale
+	for i, d := range dist {
+		dist[i] = d * scale
+	}
+	return 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 v0.0.0-20241124175250-a2463fe190a5
+	github.com/soypat/glgl v0.0.0-20241218113040-663b03b49704
 	golang.org/x/image v0.22.0
 )
 

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 v0.0.0-20241124175250-a2463fe190a5 h1:PyD0ceAopD2FDv3ddx99Q+h7QxIzDPPuOQiaZrRA7yU=
 github.com/soypat/glgl v0.0.0-20241124175250-a2463fe190a5/go.mod h1:1LcEp6XHSMCI91WlJHzl/aW4Bp5v6yQOiYFyjrlk350=
+github.com/soypat/glgl v0.0.0-20241218113040-663b03b49704 h1:KU+Ofl/VEFFM/uNpDPu+2Ds8RrkJUu21Ef0klG7xK08=
+github.com/soypat/glgl v0.0.0-20241218113040-663b03b49704/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

@@ -2,7 +2,6 @@ package gsdf
 
 import (
 	_ "embed"
-	"encoding/binary"
 	"errors"
 	"fmt"
 	"unsafe"
@@ -134,16 +133,6 @@ func absf(a float32) float32 {
 	return math32.Abs(a)
 }
 
-func hashvec2(vecs ...ms2.Vec) float32 {
-	var hashA float32 = 0.0
-	var hashB float32 = 1.0
-	for _, v := range vecs {
-		hashA, hashB = hashAdd(hashA, hashB, v.X)
-		hashA, hashB = hashAdd(hashA, hashB, v.Y)
-	}
-	return hashfint(hashA + hashB)
-}
-
 func hash2vec2(vecs ...[2]ms2.Vec) float32 {
 	var hashA float32 = 0.0
 	var hashB float32 = 1.0
@@ -156,17 +145,6 @@ func hash2vec2(vecs ...[2]ms2.Vec) float32 {
 	return hashfint(hashA + hashB)
 }
 
-func hashvec3(vecs ...ms3.Vec) float32 {
-	var hashA float32 = 0.0
-	var hashB float32 = 1.0
-	for _, v := range vecs {
-		hashA, hashB = hashAdd(hashA, hashB, v.X)
-		hashA, hashB = hashAdd(hashA, hashB, v.Y)
-		hashA, hashB = hashAdd(hashA, hashB, v.Z)
-	}
-	return hashfint(hashA + hashB)
-}
-
 func hashf(values []float32) float32 {
 	var hashA float32 = 0.0
 	var hashB float32 = 1.0
@@ -189,26 +167,26 @@ func hashfint(f float32) float32 {
 	return float32(int(f*1000000)%1000000) / 1000000 // Keep within [0.0, 1.0)
 }
 
-func hash(b []byte, in uint64) uint64 {
-	x := in
-	for len(b) >= 8 {
-		x ^= binary.LittleEndian.Uint64(b)
-		x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9
-		x = (x ^ (x >> 27)) * 0x94d049bb133111eb
-		x ^= x >> 31
-		b = b[8:]
-
-	}
-	if len(b) > 0 {
-		var buf [8]byte
-		copy(buf[:], b)
-		x ^= binary.LittleEndian.Uint64(buf[:])
-		x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9
-		x = (x ^ (x >> 27)) * 0x94d049bb133111eb
-		x ^= x >> 31
-	}
-	return x
-}
+// func hash(b []byte, in uint64) uint64 {
+// 	x := in
+// 	for len(b) >= 8 {
+// 		x ^= binary.LittleEndian.Uint64(b)
+// 		x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9
+// 		x = (x ^ (x >> 27)) * 0x94d049bb133111eb
+// 		x ^= x >> 31
+// 		b = b[8:]
+
+// 	}
+// 	if len(b) > 0 {
+// 		var buf [8]byte
+// 		copy(buf[:], b)
+// 		x ^= binary.LittleEndian.Uint64(buf[:])
+// 		x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9
+// 		x = (x ^ (x >> 27)) * 0x94d049bb133111eb
+// 		x ^= x >> 31
+// 	}
+// 	return x
+// }
 
 func hashshaderptr(s glbuild.Shader) uint64 {
 	v := *(*[2]uintptr)(unsafe.Pointer(&s))