How Clean trace of mobile line on the texture in D3D9

Question

3.00/5 (2 votes)

See more:

Hello

I have a multi-texture square vertex composed of four different .png files.
I blending them with“Alpha Blendig”.

C++

//-------------------------------------------------------------------------//
        g_pQuad[0].colDiffuse = D3DCOLOR_ARGB(10, 255, 255, 255);
	g_pQuad[0].rhw  = 1;
	g_pQuad[0].vPos = D3DXVECTOR3(0  , 0   , 0);
	g_pQuad[0].vUV1 = D3DXVECTOR2(0.0f, 0.0f);
	g_pQuad[0].vUV2 = D3DXVECTOR2(0.0f, 0.0f);
	g_pQuad[0].vUV3 = D3DXVECTOR2(0.0f, 0.0f);
	g_pQuad[0].vUV4 = D3DXVECTOR2(0.0f, 0.0f);

	g_pQuad[1].colDiffuse = D3DCOLOR_ARGB(10, 255, 255, 255);
	g_pQuad[1].rhw  = 1;
	g_pQuad[1].vPos = D3DXVECTOR3(0  , 1000 , 0);
	g_pQuad[1].vUV1 = D3DXVECTOR2(0.0f, 1.0f);
	g_pQuad[1].vUV2 =  D3DXVECTOR2(0.0f, 1.0f);
	g_pQuad[1].vUV3 =  D3DXVECTOR2(0.0f, 1.0f);
	g_pQuad[1].vUV4 =  D3DXVECTOR2(0.0f, 1.0f);
	


	g_pQuad[2].colDiffuse = D3DCOLOR_ARGB(10, 255, 255, 255);
	g_pQuad[2].rhw  = 1;
	g_pQuad[2].vPos = D3DXVECTOR3(1000, 0   , 0);
	g_pQuad[2].vUV1 = D3DXVECTOR2(1.0f, 0.0f);
	g_pQuad[2].vUV2 = D3DXVECTOR2(1.0f, 0.0f);
	g_pQuad[2].vUV3 = D3DXVECTOR2(1.0f, 0.0f);
	g_pQuad[2].vUV4 = D3DXVECTOR2(1.0f, 0.0f);
	
	g_pQuad[3].colDiffuse = D3DCOLOR_ARGB(10, 255, 255, 255);
	g_pQuad[3].rhw  = 1;
	g_pQuad[3].vPos = D3DXVECTOR3(1000, 1000 , 0);
	g_pQuad[3].vUV1 = D3DXVECTOR2(1.0f, 1.0f);
	g_pQuad[3].vUV2 = D3DXVECTOR2(1.0f, 1.0f);
	g_pQuad[3].vUV3 = D3DXVECTOR2(1.0f, 1.0f);
	g_pQuad[3].vUV4 = D3DXVECTOR2(1.0f, 1.0f);


//----------------------------------------------------------------------------//

bool MyD3DClass::InitD3D(HWND hWnd)
{

	HRESULT Res;

	//Create the device,
	if ((g_pD3D = Direct3DCreate9(D3D_SDK_VERSION)) == NULL) 
	{
		return false;
	}

	D3DPRESENT_PARAMETERS d3dpp;



	ZeroMemory(&d3dpp, sizeof(d3dpp));
	d3dpp.Windowed = true;
	d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
	d3dpp.BackBufferFormat = D3DFMT_X8R8G8B8;
	d3dpp.EnableAutoDepthStencil = TRUE;
	d3dpp.AutoDepthStencilFormat = D3DFMT_D16;
	if (FAILED(Res = g_pD3D->CreateDevice(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hWnd,  D3DCREATE_HARDWARE_VERTEXPROCESSING, &d3dpp, &g_pd3dDevice)))
        {
		return false;
	}

	
	g_pd3dDevice->SetRenderState(D3DRS_CULLMODE, D3DCULL_NONE); 
	g_pd3dDevice->SetRenderState(D3DRS_LIGHTING, FALSE);
	g_pd3dDevice->SetRenderState(D3DRS_ZENABLE, FALSE); 
	
	for(unsigned i = 0;i < 8;++i)
	{
		g_pd3dDevice->SetSamplerState(i,D3DSAMP_MINFILTER,D3DTEXF_LINEAR);
		g_pd3dDevice->SetSamplerState(i,D3DSAMP_MAGFILTER,D3DTEXF_LINEAR);
		g_pd3dDevice->SetSamplerState(i,D3DSAMP_MIPFILTER,D3DTEXF_ANISOTROPIC);
	}


	g_pd3dDevice->SetTextureStageState(0,D3DTSS_TEXCOORDINDEX,0);
	g_pd3dDevice->SetTextureStageState(0,D3DTSS_COLORARG1,D3DTA_TEXTURE);
	g_pd3dDevice->SetTextureStageState(0,D3DTSS_COLOROP,D3DTOP_SELECTARG1);

	g_pd3dDevice->SetTextureStageState(1,D3DTSS_TEXCOORDINDEX,1);
	g_pd3dDevice->SetTextureStageState(1,D3DTSS_COLORARG1,D3DTA_TEXTURE);
	g_pd3dDevice->SetTextureStageState(1,D3DTSS_COLORARG2,D3DTA_CURRENT);
	g_pd3dDevice->SetTextureStageState(1,D3DTSS_COLOROP,D3DTOP_MODULATE);
	g_pd3dDevice->SetTextureStageState(1,D3DTSS_ALPHAARG1,D3DTA_TEXTURE);
	g_pd3dDevice->SetTextureStageState(1,D3DTSS_ALPHAARG2,D3DTA_CURRENT);
	g_pd3dDevice->SetTextureStageState(1,D3DTSS_ALPHAOP,D3DTOP_MODULATE);

	g_pd3dDevice->SetTextureStageState(2,D3DTSS_TEXCOORDINDEX,2);
	g_pd3dDevice->SetTextureStageState(2,D3DTSS_COLORARG1,D3DTA_TEXTURE);
	g_pd3dDevice->SetTextureStageState(2,D3DTSS_COLORARG2,D3DTA_CURRENT);
	g_pd3dDevice->SetTextureStageState(2,D3DTSS_COLOROP,D3DTOP_MODULATE);
	g_pd3dDevice->SetTextureStageState(2,D3DTSS_ALPHAARG1,D3DTA_TEXTURE);
	g_pd3dDevice->SetTextureStageState(2,D3DTSS_ALPHAARG2,D3DTA_CURRENT);
	g_pd3dDevice->SetTextureStageState(2,D3DTSS_ALPHAOP,D3DTOP_MODULATE);

	g_pd3dDevice->SetTextureStageState(3,D3DTSS_TEXCOORDINDEX,3);
	g_pd3dDevice->SetTextureStageState(3,D3DTSS_COLORARG1,D3DTA_TEXTURE);
	g_pd3dDevice->SetTextureStageState(3,D3DTSS_COLORARG2,D3DTA_CURRENT);
	g_pd3dDevice->SetTextureStageState(3,D3DTSS_COLOROP,D3DTOP_MODULATE);
	g_pd3dDevice->SetTextureStageState(3,D3DTSS_ALPHAARG1,D3DTA_TEXTURE);
	g_pd3dDevice->SetTextureStageState(3,D3DTSS_ALPHAARG2,D3DTA_CURRENT);
	g_pd3dDevice->SetTextureStageState(3,D3DTSS_ALPHAOP,D3DTOP_MODULATE);

	
	g_pd3dDevice->SetRenderState(D3DRS_ALPHABLENDENABLE, true);
	g_pd3dDevice->SetRenderState(D3DRS_SRCBLEND, D3DBLEND_SRCALPHA);
	g_pd3dDevice->SetRenderState(D3DRS_DESTBLEND,D3DBLEND_INVSRCALPHA);


	return true;

}

I want to draw a variable length line on this surface. Drawing of line is triggered by mouse move event and the line connects a predefined point on the surface to the current mouse position.

I know that it is possible to redraw the background to clear the trace of the old line and then draw a new line but I want to use a different method being independent from the background texture.

In a word,I want to do this work like the draw line in the “paint”,I don’t want to have to call setTexture() or clear() functions again.how I can do this?

Regards from your help.

[EDIT] Added <pre> tags around code sniplet for better readability - Code-o-mat [/EDIT]

Posted 3-Feb-12 20:36pm

zoltrix61

Updated 29-Apr-12 23:31pm

Code-o-mat

v5

Add a Solution

2 solutions

Solution 1

I can think of 3 solutions for this task. Don't know which would be the best/most appropriate for your needs.

1. Use the logical XOR operation to non-destructively draw the line. Repeat to remove line.

2. Load the image, draw over it, re-load when line is no longer needed

3. Load the image, save position and color of all modified pixels while drawing the line, restore the modified pixels. (or perhaps save a rectangular block that contains all modified pixels)

1 is the quickest, though the line color is hard to control AND it varies with the underlying content

2 is the easiest (and most wasteful)

3 will give single, solid line colours easily (or shaded ones for that matter) - it will also be faster than 2 - especially when using large, compressed images that have a small portion changed to display the line.

Can't remember where right now - but I'm pretty sure I've seen the 'game of life' simulated and displayed on the side(s) of a cube. I'd try looking up draw-to-texture and the game-of-life. The g.o.l would be ideal, since often a static background is used with continually evolving colonies of 'life' draw atop this background.

Also, don't know if you can get a handle to a texture(from the gpu/directX), then modify it and have the modifications displayed, OR if you need to resend the modified texture to the gpu/directX and obtain a new handle to the texture. If you don't know what I'm talking about, best you get a comfy chair and a coffee - you may have a little reading to do...

Posted 19-Feb-12 3:29am

enhzflep

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

barneyman · Accepted Answer · 2012-02-19T12:22:00

Solution 2

Alternatives to enhzflep's solutions, if you don't have access to/want to change the texture ...

1. Multiple textures - first is your map, second is your line
2. Stencil 'Shadows' - render the line 'above' the map, then cast a shadow from it, perp'l to the map

again, comfy chair, coffee

Posted 19-Feb-12 12:22pm

barneyman

Comments

Espen Harlinn 19-Feb-12 18:25pm

Good reply, my 5 :)

zoltrix61 8-Apr-12 1:52am

I have a multi-texture square vertex composed of three different .png files. I want to draw a variable length line on this surface. Drawing of line is triggered by mouse move event and the line connects a predefined point on the surface to the current mouse position. I know that it is possible to redraw the background to clear the trace of the old line and then draw a new line but I want to use a different method being independent from the background texture.

How can I write this program with multi-texture technique?
Can you put on example for me,please...

barneyman 13-Apr-12 3:58am

https://www.google.com.au/webhp?sourceid=chrome-instant&ie=UTF-8&ion=1#hl=en&safe=off&output=search&sclient=psy-ab&q=directx%20texture%20stages&oq=&aq=&aqi=&aql=&gs_l=&pbx=1&fp=37b244dfe41e981b&ion=1&bav=on.2,or.r_gc.r_pw.r_cp.r_qf.,cf.osb&biw=1280&bih=909

Toymaker and Two Kings have great tutorials (items #4 and #5 in the list) - it's where I learned most of my DX info from