D3D9 Rendering Issues 1.12.1.5875

[derekman007]

DrawPrimitive returns S_OK but I don't see the points connected.

I have an EndScene hook where I am doing the drawing. I've injected a DLL and I hooked LoadLibrary while the process is suspended to hook Direct3DCreate9 and eventually hook the VMT containing the EndScene function.

I've rewrote a lot of the code for wowmapper and wrote some code for Recast to generate NavMeshes for vanilla wow.
I can successfully generate a path given two locations and I am trying to render the points connected in my EndScene hook using DrawPrimitive with the D3DPT_LINELIST primitive type.

I'll admit that I am just beginning to learn Direct X, but any direction would be appreciated.

I've disabled lighting, z buffer, vertex and pixel shaders and I have the vertex format set to D3DFVF_XYZRHW | D3DFVF_DIFFUSE, so the vertex data is prepared in screen coordinates.

I know the code is not great(creating a vertex buffer every frame but I'm just trying to get something working before I refactor).

The DrawBox and DrawLine methods use IDirect3DDevice9::Clear to draw lines.

WoWScrnShot_090916_183027.jpg

https://i.imgur.com/Z8Az6oy.jpg

struct line_vertex {
	float x, y, z, rhw;  // The transformed(screen space) position for the vertex.
	DWORD colour;        // The vertex colour.
};

HRESULT WINAPI EndScene_Hook(IDirect3DDevice9 *thisPtr)
{
	if (bRunning) {
		std::lock_guard<std::mutex> guard(objManager.mutexObjectList);
		for (std::vector<UnitObject*>::iterator iter = objManager.unitObjectList.begin(); iter != objManager.unitObjectList.end(); iter++) {
			D3DXVECTOR3 in;
			D3DXVECTOR3 inTop;
			D3DXVECTOR3 out;
			D3DXVECTOR3 outTop;
			in.x = (*iter)->pos.x;
			in.y = (*iter)->pos.y;
			in.z = (*iter)->pos.z;
			inTop.x = (*iter)->pos.x;
			inTop.y = (*iter)->pos.y;
			inTop.z = (*iter)->pos.z + 2.0f;
			if (WorldToScreen(thisPtr, in, &out)) {
				WorldToScreen(thisPtr, inTop, &outTop);
				float height = abs(out.y - outTop.y);
				float width = height / 2.0f;
				DrawBox(thisPtr, out.x - width / 2.0f, out.y - height, width, height, D3DCOLOR_ARGB(0, 255, 0, 0));
			}
		}

		//Draw generated path
		if (pathLength != 0) {
			D3DXVECTOR3* outPath = new D3DXVECTOR3[pathLength];
			for (int i = 0; i < pathLength; i++) {
				D3DXVECTOR3 inPath;
				inPath.x = path[i].x;
				inPath.y = path[i].y;
				inPath.z = path[i].z;
				if (WorldToScreen(thisPtr, inPath, &outPath[i])) {
					DrawLineH(thisPtr, outPath[i].x, outPath[i].x + 5, outPath[i].y, 5, D3DCOLOR_ARGB(0, 0, 255, 0));
				}
			}

			line_vertex* vertData = new line_vertex[pathLength];
			for (int i = 0; i < pathLength; i++) {
				vertData[i].x = outPath[i].x;
				vertData[i].y = outPath[i].y;
				vertData[i].z = 0.0f;
				vertData[i].rhw = 1.0f;
				vertData[i].colour = D3DCOLOR_ARGB(0, 0, 0, 255);
			}
			IDirect3DStateBlock9* pStateBlock;
			thisPtr->CreateStateBlock(D3DSBT_ALL, &pStateBlock);
			pStateBlock->Capture();
			IDirect3DVertexBuffer9* vertexBuffer;

			thisPtr->CreateVertexBuffer(sizeof(line_vertex) * pathLength, D3DUSAGE_WRITEONLY, D3DFVF_XYZRHW | D3DFVF_DIFFUSE, D3DPOOL_DEFAULT, &vertexBuffer, NULL);

			VOID* pVoid;
			vertexBuffer->Lock(0, 0, (void**)&pVoid, 0);
			memcpy(pVoid, vertData, sizeof(line_vertex) * pathLength);
			vertexBuffer->Unlock();

			thisPtr->SetRenderState(D3DRS_LIGHTING, FALSE);
			thisPtr->SetRenderState(D3DRS_ZENABLE, D3DZB_FALSE);
			thisPtr->SetVertexShader(NULL);
			thisPtr->SetPixelShader(NULL);
			thisPtr->SetTexture(0, NULL);

			thisPtr->SetFVF((D3DFVF_XYZRHW | D3DFVF_DIFFUSE));
			thisPtr->SetStreamSource(0, vertexBuffer, 0, sizeof(line_vertex));
			thisPtr->DrawPrimitive(D3DPT_LINELIST, 0, pathlength - 1); //S_OK

			if (vertexBuffer != NULL)
				vertexBuffer->Release();

			pStateBlock->Apply();
		}
	}
	return origEndScene(thisPtr);
}

Thanks for taking a look! maybe after some more sleep I'll find the issue.