There is an issue related to vertices pages boundary overlap. Result is extra random triangles or missed triangles. Issue reproduced on my devices iPad Mini (iOS 15.7.1), iPhone 7+ (iOS 15.7.5) and all Simulators (iOS 13.7, 14.2, 16.4).

Simplified sample code. Triangles should fill-up all node to make glitches easy visible. 5 vertices per iteration used to guarantee pages overlap.

- (void) draw:(CCRenderer *)renderer transform:(const GLKMatrix4 *)transform
{
    int verticesCount = 65535*2+10; // to make two pages overlaps
    int trianglesDrawsCount = (verticesCount/5); 
    
    GLKVector4 redColor = [CCColor colorWithRed:1. green:0. blue:0. alpha:1.].glkVector4;
    CGFloat x,y,d;
    int trianlgesPerRow = 132;
    d = <triangle size to fill-up node with triangles>;

    CGFloat vertexArray[10];
    CGPoint points[5];
    for (int trianglesDraw=0; trianglesDraw<trianglesDrawsCount; trianglesDraw++) {
        x = d*(trianglesDraw%trianlgesPerRow);
        y = d*(trianglesDraw/trianlgesPerRow);
        
        vertexArray[0] = x;
        vertexArray[1] = y;
        vertexArray[2] = x+d;
        vertexArray[3] = y;
        vertexArray[4] = x+d;
        vertexArray[5] = y+d;
        
        vertexArray[6] = x;
        vertexArray[7] = y+d;
        vertexArray[8] = x+d;
        vertexArray[9] = y+d;

        CCRenderBuffer buffer = [renderer enqueueTriangles:2 andVertexes:5 withState:self.renderState globalSortOrder:0];

        for (int i=0; i<5; ++i) {
            points[i] = ccp(vertexArray[2*i], vertexArray[2*i+1]);
            CCRenderBufferSetVertex(buffer, i, CCVertexApplyTransform((CCVertex){{points[i].x, points[i].y, 0, 1}, {0, 0}, {0, 0}, redColor}, transform));
        }

        CCRenderBufferSetTriangle(buffer, 0, 0, 1, 2);
        CCRenderBufferSetTriangle(buffer, 1, 0, 3, 4);
    }
}

Result is in attachment.

Take a look into CCNoARC.m file. Method CCRenderer::enqueueLines:andVertexes:withState:globalSortOrder:

-(CCRenderBuffer)enqueueTriangles:(NSUInteger)triangleCount andVertexes:(NSUInteger)vertexCount withState:(CCRenderState *)renderState globalSortOrder:(NSInteger)globalSortOrder;
{
	// Need to record the first vertex or element index before pushing more vertexes.
	NSUInteger firstVertex = _buffers->_vertexBuffer->_count;
	NSUInteger firstIndex = _buffers->_indexBuffer->_count;
	
	// Value is 0 unless there a page boundary overlap would occur.
	NSUInteger vertexPageOffset = PageOffset(firstVertex, vertexCount);
	if (vertexPageOffset>0) {
		int stop=0; // #1 if we got here then visual bug will be
	}
	
	// Split vertexes into pages of 2^16 vertexes since GLES2 requires indexing with shorts.
	NSUInteger vertexPage = (firstVertex + vertexPageOffset) >> 16;
	NSUInteger vertexPageIndex = (firstVertex + vertexPageOffset) & 0xFFFF;
	
	// Ensure that the buffers have enough storage space.
	NSUInteger indexCount = 3*triangleCount;
	CCVertex *vertexes = CCGraphicsBufferPushElements(_buffers->_vertexBuffer, vertexCount + vertexPageOffset);
	if (vertexPageOffset>0) {
		vertexes = vertexes + vertexPageOffset; // #2 vertices will be stored from beginning of the next page
	}

You can set breakpoint in line with my first comment to easily detect error.

	if (vertexPageOffset>0) {
		int stop=0; // #1 if we got here then visual bug will be
	}

I've added last three lines to fix this issue. I don't know is it solution or just workaround, but it works now.

	if (vertexPageOffset>0) {
		vertexes = vertexes + vertexPageOffset; // #2 vertices will be stored from beginning of the next page
	}

I hope it helps somebody.

Hello,

Does this project support Ninja generator?

I am trying to compile with Ninja and see error below.

[414/640] Building CXX object engine/cocos/core/CMakeFiles/cocos2d.dir/platform/apple/CCFileUtils-apple.mm.o FAILED: engine/cocos/core/CMakeFiles/cocos2d.dir/platform/apple/CCFileUtils-apple.mm.o /usr/local/opt/llvm@16/bin/clang++ -DCOCOS2D_DEBUG=1 -DLWS_WITH_LIBUV -DUSE_FILE32API -D__APPLE__ -I/System/Library/Frameworks -I/Users/panpaliamahen/github/game/cocos2d-x -I/Users/panpaliamahen/github/game/cocos2d-x/cocos -I/Users/panpaliamahen/github/game/cocos2d-x/extensions -I/Users/panpaliamahen/github/game/cocos2d-x/cocos/platform -I/Users/panpaliamahen/github/game/cocos2d-x/cocos/editor-support -I/Users/panpaliamahen/github/game/cocos2d-x/external/recast/.. -I/Users/panpaliamahen/github/game/cocos2d-x/external/tinyxml2/. -I/Users/panpaliamahen/github/game/cocos2d-x/external/xxhash/. -I/Users/panpaliamahen/github/game/cocos2d-x/external/xxtea/. -I/Users/panpaliamahen/github/game/cocos2d-x/external/clipper/. -I/Users/panpaliamahen/github/game/cocos2d-x/external/edtaa3func/. -I/Users/panpaliamahen/github/game/cocos2d-x/external/ConvertUTF/. -I/Users/panpaliamahen/github/game/cocos2d-x/external/poly2tri/.. -I/Users/panpaliamahen/github/game/cocos2d-x/external/md5/.. -I/Users/panpaliamahen/github/game/cocos2d-x/external/unzip/. -isystem /Users/panpaliamahen/github/game/cocos2d-x/external/Box2D/include -isystem /Users/panpaliamahen/github/game/cocos2d-x/external/chipmunk/include -isystem /Users/panpaliamahen/github/game/cocos2d-x/external/freetype2/include/mac/freetype2 -isystem /Users/panpaliamahen/github/game/cocos2d-x/external/bullet/include -isystem /Users/panpaliamahen/github/game/cocos2d-x/external/bullet/include/bullet -isystem /Users/panpaliamahen/github/game/cocos2d-x/external/jpeg/include/mac -isystem /Users/panpaliamahen/github/game/cocos2d-x/external/openssl/include/mac -isystem /Users/panpaliamahen/github/game/cocos2d-x/external/uv/include -isystem /Users/panpaliamahen/github/game/cocos2d-x/external/webp/include/mac -isystem /Users/panpaliamahen/github/game/cocos2d-x/external/websockets/include/mac -isystem /Users/panpaliamahen/github/game/cocos2d-x/external/curl/include/mac -isystem /Users/panpaliamahen/github/game/cocos2d-x/external/png/include/mac -isystem /Users/panpaliamahen/github/game/cocos2d-x/external/glfw3/include/mac -isystem /Users/panpaliamahen/github/game/cocos2d-x/external/zlib/include -isystem /Users/panpaliamahen/github/game/cocos2d-x/external/glsl-optimizer/include -g -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX13.1.sdk -mmacosx-version-min=12.6 -std=c++11 -Winvalid-pch -Xclang -include-pch -Xclang /Users/panpaliamahen/github/game/cocos2d-x/cmake-build-debug/engine/cocos/core/CMakeFiles/cocos2d.dir/cmake_pch.hxx.pch -Xclang -include -Xclang /Users/panpaliamahen/github/game/cocos2d-x/cmake-build-debug/engine/cocos/core/CMakeFiles/cocos2d.dir/cmake_pch.hxx -MD -MT engine/cocos/core/CMakeFiles/cocos2d.dir/platform/apple/CCFileUtils-apple.mm.o -MF engine/cocos/core/CMakeFiles/cocos2d.dir/platform/apple/CCFileUtils-apple.mm.o.d -o engine/cocos/core/CMakeFiles/cocos2d.dir/platform/apple/CCFileUtils-apple.mm.o -c /Users/panpaliamahen/github/game/cocos2d-x/cocos/platform/apple/CCFileUtils-apple.mm error: Objective-C was disabled in PCH file but is currently enabled 1 error generated.

Please let me know if you need more information?

Thanks, Mahendra