internal/graphicsdriver/playstation5: bug fix: compile error

A Go pointer in a C struct could cause some troubles.

internal/graphicsdriver/playstation5/graphics_playstation5.cpp

@@ -32,8 +32,11 @@ ebitengine_NewScreenFramebufferImage(int *image, int width, int height) {
 
 extern "C" void ebitengine_DisposeImage(int id) {}
 
-extern "C" ebitengine_Error
-ebitengine_DrawTriangles(ebitengine_DrawTrianglesArgs *args) {
+ebitengine_Error
+ebitengine_DrawTriangles(int dst, int *srcs, int srcCount, int shader,
+                         ebitengine_DstRegion *dstRegions, int dstRegionCount,
+                         int indexOffset, ebitengine_Blend blend,
+                         uint32_t *uniforms, int uniformCount, int fillRule) {
   return {};
 }
 

internal/graphicsdriver/playstation5/graphics_playstation5.go

@@ -118,26 +118,24 @@ func (g *Graphics) NewShader(program *shaderir.Program) (graphicsdriver.Shader,
 }
 
 func (g *Graphics) DrawTriangles(dst graphicsdriver.ImageID, srcs [graphics.ShaderSrcImageCount]graphicsdriver.ImageID, shader graphicsdriver.ShaderID, dstRegions []graphicsdriver.DstRegion, indexOffset int, blend graphicsdriver.Blend, uniforms []uint32, fillRule graphicsdriver.FillRule) error {
-	csrcs := make([]C.int, len(srcs))
+	cSrcs := make([]C.int, len(srcs))
 	for i, src := range srcs {
-		csrcs[i] = C.int(src)
+		cSrcs[i] = C.int(src)
 	}
+	defer runtime.KeepAlive(cSrcs)
+
 	cDstRegions := make([]C.ebitengine_DstRegion, len(dstRegions))
+	defer runtime.KeepAlive(cDstRegions)
 	for i, r := range dstRegions {
 		cDstRegions[i] = C.ebitengine_DstRegion{
-			Region: C.ebitengine_Rectangle{
 			MinX:       C.int(r.Region.Min.X),
 			MinY:       C.int(r.Region.Min.Y),
 			MaxX:       C.int(r.Region.Max.X),
 			MaxY:       C.int(r.Region.Max.Y),
-			},
 			IndexCount: C.int(r.IndexCount),
 		}
 	}
-	cUniforms := make([]C.uint32_t, len(uniforms))
-	for i, u := range uniforms {
-		cUniforms[i] = C.uint32_t(u)
-	}
+
 	cBlend := C.ebitengine_Blend{
 		BlendFactorSourceRGB:        C.uint8_t(blend.BlendFactorSourceRGB),
 		BlendFactorSourceAlpha:      C.uint8_t(blend.BlendFactorSourceAlpha),
@@ -147,23 +145,15 @@ func (g *Graphics) DrawTriangles(dst graphicsdriver.ImageID, srcs [graphics.Shad
 		BlendOperationAlpha:         C.uint8_t(blend.BlendOperationAlpha),
 	}
 
-	args := C.ebitengine_DrawTrianglesArgs{
-		Dst:            C.int(dst),
-		Srcs:           &csrcs[0],
-		SrcCount:       C.int(len(csrcs)),
-		Shader:         C.int(shader),
-		DstRegions:     &cDstRegions[0],
-		DstRegionCount: C.int(len(cDstRegions)),
-		IndexOffset:    C.int(indexOffset),
-		Blend:          cBlend,
-		Uniforms:       &cUniforms[0],
-		UniformCount:   C.int(len(cUniforms)),
-		FillRule:       C.int(fillRule),
+	cUniforms := make([]C.uint32_t, len(uniforms))
+	defer runtime.KeepAlive(cUniforms)
+	for i, u := range uniforms {
+		cUniforms[i] = C.uint32_t(u)
 	}
-	if err := C.ebitengine_DrawTriangles(&args); !C.ebitengine_IsErrorNil(&err) {
+
+	if err := C.ebitengine_DrawTriangles(C.int(dst), &cSrcs[0], C.int(len(cSrcs)), C.int(shader), &cDstRegions[0], C.int(len(cDstRegions)), C.int(indexOffset), cBlend, &cUniforms[0], C.int(len(cUniforms)), C.int(fillRule)); !C.ebitengine_IsErrorNil(&err) {
 		return newPlaystation5Error("(*playstation5.Graphics).DrawTriangles", err)
 	}
-	runtime.KeepAlive(args)
 	return nil
 }
 

internal/graphicsdriver/playstation5/graphics_playstation5.h

@@ -34,15 +34,11 @@ static bool ebitengine_IsErrorNil(ebitengine_Error *err) {
   return err->Message == NULL && err->Code == 0;
 }
 
-typedef struct ebitengine_Rectangle {
+typedef struct ebitengine_DstRegion {
   int MinX;
   int MinY;
   int MaxX;
   int MaxY;
-} ebitengine_Rectangle;
-
-typedef struct ebitengine_DstRegion {
-  ebitengine_Rectangle Region;
   int IndexCount;
 } ebitengine_DstRegion;
 
@@ -55,26 +51,17 @@ typedef struct ebitengine_Blend {
   uint8_t BlendOperationAlpha;
 } ebitengine_Blend;
 
-typedef struct ebitengine_DrawTrianglesArgs {
-  int Dst;
-  int *Srcs;
-  int SrcCount;
-  int Shader;
-  ebitengine_DstRegion *DstRegions;
-  int DstRegionCount;
-  int IndexOffset;
-  ebitengine_Blend Blend;
-  uint32_t *Uniforms;
-  int UniformCount;
-  int FillRule;
-} ebitengine_DrawTrianglesArgs;
-
 ebitengine_Error ebitengine_InitializeGraphics(void);
 ebitengine_Error ebitengine_NewImage(int *image, int width, int height);
 ebitengine_Error ebitengine_NewScreenFramebufferImage(int *image, int width,
                                                       int height);
 void ebitengine_DisposeImage(int id);
-ebitengine_Error ebitengine_DrawTriangles(ebitengine_DrawTrianglesArgs *args);
+
+ebitengine_Error
+ebitengine_DrawTriangles(int dst, int *srcs, int srcCount, int shader,
+                         ebitengine_DstRegion *dstRegions, int dstRegionCount,
+                         int indexOffset, ebitengine_Blend blend,
+                         uint32_t *uniforms, int uniformCount, int fillRule);
 
 ebitengine_Error ebitengine_NewShader(int *shader, const char *source);
 void ebitengine_DisposeShader(int id);

vector/export_test.go

@@ -0,0 +1,32 @@
+// Copyright 2024 The Ebitengine Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package vector
+
+type Point struct {
+	X, Y float32
+}
+
+func IsPointCloseToSegment(p, p0, p1 Point, allow float32) bool {
+	return isPointCloseToSegment(point{
+		x: p.X,
+		y: p.Y,
+	}, point{
+		x: p0.X,
+		y: p0.Y,
+	}, point{
+		x: p1.X,
+		y: p1.Y,
+	}, allow)
+}

vector/path.go

@@ -232,12 +232,17 @@ func lineForTwoPoints(p0, p1 point) (a, b, c float32) {
 }
 
 // isPointCloseToSegment detects the distance between a segment (x0, y0)-(x1, y1) and a point (x, y) is less than allow.
+// If p0 and p1 are the same, isPointCloseToSegment returns true when the distance between p0 and p is less than allow.
 func isPointCloseToSegment(p, p0, p1 point, allow float32) bool {
+	if p0 == p1 {
+		return allow*allow >= (p0.x-p.x)*(p0.x-p.x)+(p0.y-p.y)*(p0.y-p.y)
+	}
+
 	a, b, c := lineForTwoPoints(p0, p1)
 
 	// The distance between a line ax+by+c=0 and (x0, y0) is
 	//     |ax0 + by0 + c| / √(a² + b²)
-	return allow*allow*(a*a+b*b) > (a*p.x+b*p.y+c)*(a*p.x+b*p.y+c)
+	return allow*allow*(a*a+b*b) >= (a*p.x+b*p.y+c)*(a*p.x+b*p.y+c)
 }
 
 // crossingPointForTwoLines returns a crossing point for two lines.

vector/path_test.go

@@ -0,0 +1,88 @@
+// Copyright 2024 The Ebitengine Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package vector_test
+
+import (
+	"testing"
+
+	"github.com/hajimehoshi/ebiten/v2/vector"
+)
+
+func TestIsPointCloseToSegment(t *testing.T) {
+	testCases := []struct {
+		p     vector.Point
+		p0    vector.Point
+		p1    vector.Point
+		allow float32
+		want  bool
+	}{
+		{
+			p:     vector.Point{0.5, 0.5},
+			p0:    vector.Point{0, 0},
+			p1:    vector.Point{1, 0},
+			allow: 1,
+			want:  true,
+		},
+		{
+			p:     vector.Point{0.5, 1.5},
+			p0:    vector.Point{0, 0},
+			p1:    vector.Point{1, 0},
+			allow: 1,
+			want:  false,
+		},
+		{
+			p:     vector.Point{0.5, 0.5},
+			p0:    vector.Point{0, 0},
+			p1:    vector.Point{1, 1},
+			allow: 0,
+			want:  true,
+		},
+		{
+			p:     vector.Point{0, 1},
+			p0:    vector.Point{0, 0},
+			p1:    vector.Point{1, 1},
+			allow: 0.7,
+			want:  false,
+		},
+		{
+			p:     vector.Point{0, 1},
+			p0:    vector.Point{0, 0},
+			p1:    vector.Point{1, 1},
+			allow: 0.8,
+			want:  true,
+		},
+		{
+			// p0 and p1 are the same.
+			p:     vector.Point{0, 1},
+			p0:    vector.Point{0.5, 0.5},
+			p1:    vector.Point{0.5, 0.5},
+			allow: 0.7,
+			want:  false,
+		},
+		{
+			// p0 and p1 are the same.
+			p:     vector.Point{0, 1},
+			p0:    vector.Point{0.5, 0.5},
+			p1:    vector.Point{0.5, 0.5},
+			allow: 0.8,
+			want:  true,
+		},
+	}
+	for _, tc := range testCases {
+		if got := vector.IsPointCloseToSegment(tc.p, tc.p0, tc.p1, tc.allow); got != tc.want {
+			t.Errorf("got: %v, want: %v", got, tc.want)
+		}
+	}
+}