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D3D8 - Intro to Vertex and Index BuffersSession Start: Wed Jan 08 00:44:06 2003 [00:44] DCC Chat connection established - [00:44] <Error404> Sorry, I was reading logs. [00:44] <RedBeard> gimme a min [00:45] <Error404> ok. [00:45] <RedBeard> i recommend you go through the code and find every single Direct3D function call, and look it up in the d3d docs to figure out what all the parameters are for [00:46] <Error404> Ok. [00:47] <Error404> msdn or just the ones that came with d3d8? [00:47] <Error404> I have the ones open that came with the SDK. [00:47] <Error404> They are usually open whenever i attempt to code dx [00:47] <RedBeard> the d3d docs that come with the sdk [00:48] <Error404> completely start over my d3d class? [00:48] <RedBeard> not yet [00:48] <RedBeard> lemme modify your initd3d function [00:48] <RedBeard> uh, initvb [00:49] <Error404> Ok. [00:50] <RedBeard> bool cDXanadu::InitVB() [00:50] <RedBeard> { [00:50] <RedBeard> StartLog("cDXanadu::InitVB");loc; [00:50] <RedBeard> if(FAILED( pd3dDevice->CreateVertexBuffer(50*3*sizeof(CUSTOMVERTEX), 0, [00:50] <RedBeard> D3DFVF_CUSTOMVERTEX,D3DPOOL_DEFAULT, [00:50] <RedBeard> &vb))) [00:50] <RedBeard> return false; [00:50] <RedBeard> CUSTOMVERTEX * pVertices; [00:50] <RedBeard> if(FAILED( vb->Lock(0, 0,(BYTE**)&pVertices,D3DLOCK_DISCARD))) [00:50] <RedBeard> return false; [00:50] <RedBeard> DWORD i; [00:50] <RedBeard> FLOAT theta, theta2; [00:50] <RedBeard> for(i=0;i<50;i+=2) [00:50] <RedBeard> { [00:50] <RedBeard> theta = (2*D3DX_PI*i)/(50-1); [00:50] <RedBeard> theta2= (2*D3DX_PI*(i+1))/(50-1); [00:50] <RedBeard> pVertices[3*i+0].position = D3DXVECTOR3 (sinf(theta), -1.0f,cosf(theta)); [00:50] <RedBeard> pVertices[3*i+1].position = D3DXVECTOR3 (sinf(theta), 1.0f,cosf(theta)); [00:50] <RedBeard> pVertices[3*i+2].position = D3DXVECTOR3 (sinf(theta2),-1.0f,cosf(theta2)); [00:50] <RedBeard> pVertices[3*i+3].position = D3DXVECTOR3 (sinf(theta), 1.0f,cosf(theta)); [00:50] <RedBeard> pVertices[3*i+4].position = D3DXVECTOR3 (sinf(theta2), 1.0f,cosf(theta2)); [00:50] <RedBeard> pVertices[3*i+5].position = D3DXVECTOR3 (sinf(theta2),-1.0f,cosf(theta2)); [00:50] <RedBeard> } [00:50] <RedBeard> vb->Unlock(); [00:50] <RedBeard> return true; [00:50] <RedBeard> } [00:51] <RedBeard> no idea if that will work properly [00:52] <RedBeard> i can't compile the app here, dont have certain headers [00:52] <RedBeard> then in DoFrame, use this line in place of what's there [00:52] <RedBeard> pd3dDevice->DrawPrimitive(D3DPT_TRIANGLELIST,0,2*50-2); [00:54] <Error404> Err [00:54] <Error404> Well.. it animated [00:54] <Error404> but the cylinder is weird [00:54] <Error404> and faces are everywhere [00:54] <RedBeard> hrmm [00:55] <Error404> Do I have to know the equation to design a cynlinder in a for loop to be a good dx programmer? [00:55] <Error404> cylinder. [00:55] <RedBeard> heh not really [00:55] <RedBeard> but you need to know how the geometry is arranged [00:56] <RedBeard> so that it makes a surface [00:56] <RedBeard> i'd like to get you started on an index buffer method, but it would be a bit complicated to add that on-the-fly [00:56] <Error404> I can rewrite the entire direct x class quick like [00:56] <Error404> I've rewritten it over and over for the past week now. [00:57] <RedBeard> heh hold on a sec [00:57] <RedBeard> give it an IDirect3DIndexBuffer8 * ib [00:57] <Error404> The current or new class? [00:58] <RedBeard> whichever you're working with [00:58] <RedBeard> mebbe start over with a sample app that works [00:58] <RedBeard> and modify that [00:58] <RedBeard> or sample code [00:58] <Error404> Ok let me go back a few tutorials. [00:58] <RedBeard> wait, lemme see if i can compile this stuff [00:59] <Error404> I went back to the first file set I sent you. [00:59] <Error404> It was working, it just draws a triangle with diff vertex shades. [01:00] <RedBeard> mm ok [01:00] <RedBeard> send me those again? [01:00] <RedBeard> and i'll try to help you expand it [01:01] <Error404> Ok. [01:01] <Error404> If its possible can we open a DCC with the other computer, it would allow me to chat and code at the same time. [01:01] <Error404> Actually nevermind. [01:02] <Error404> This works. [01:02] <Error404> Helps for copynpaste -- switch from one DCC to another -- [01:02] <Error405> thanks [01:03] <Error405> In the clean up I can just do if(!vb) right? [01:03] <Error405> Since NULL is 0. [01:04] <RedBeard> yes [01:04] <RedBeard> it's technically correct, although some people like you to explicitly compare against NULL [01:04] <RedBeard> i say don't worry about that unless it's not clear that you're using a pointer [01:05] <Error405> Yeah. that makes since. [01:05] <Error405> sense [01:05] <RedBeard> using NULL makes it more readable when using pointers [01:05] <Error405> So people aren't guessing what i'm doing. No 'clever code'. [01:06] <RedBeard> right [01:06] <RedBeard> don't try to outwit the compiler, it knows what it's doing [01:06] <RedBeard> oh and another thing, don't EVER use the incrementer operator inside other code [01:06] <RedBeard> it causes much pain when used as such [01:06] <Error405> I try to force good coding practice on myself so I wont write bad code. [01:06] <Error405> inside other code? [01:06] <RedBeard> array[i++] = 12; [01:07] <Error405> Oh. [01:07] <RedBeard> instead, do: array[i] = 12; i++; [01:07] <Error405> ah i see. [01:07] <RedBeard> it's clearer and less bug-prone [01:09] <RedBeard> alright, so what are ya gonna do? [01:09] <Error405> Well if you think it'd be easier to restart, I can do that and remake the class. [01:09] <Error405> Or I can use the class I gave you, which is really simple I think. [01:10] <RedBeard> nah it's not worth tearing it down [01:11] <RedBeard> IDirect3DIndexBuffer8 *ib; <== add that [01:11] <Error405> got that [01:11] <RedBeard> now you gotta create and initialize the vb to be used as being indexed [01:11] <RedBeard> with a single triangle, that's no different [01:11] <RedBeard> so now, create and init the index buffer [01:12] <RedBeard> CreateIndexBuffer(...) [01:12] <Error405> alright. [01:12] <Error405> ok.. umm. [01:12] <RedBeard> 3 indices, D3DUSAGE_WRITEONLY [01:12] <Error405> Do I change the &vb to ib>? [01:13] <RedBeard> you need a vertex buffer AND an index buffer, so you're making both still, right? [01:13] <Error405> oh i do? [01:13] <RedBeard> so in calls dealing with the index buffer, use "ib" [01:13] <Error405> ah ok [01:13] <RedBeard> yes, the index buffer just stores integer (short, 16-bit) indices [01:14] <RedBeard> and the vertices are still stored in the vertex buffer [01:14] <RedBeard> D3DFMT_INDEX16 [01:14] <RedBeard> default pool [01:15] <Error405> ok.. ah please slow.. lol.. For the createindexbuffer do I keep it the same as it was just change the second variable to D3DUSAGE_WRITEONLY correct.. Ok I got that. [01:15] <RedBeard> look it up in teh docs to see what im talking about with these values [01:16] <Error405> yeah that is where i found out where to put writeonly [01:16] <Error405> lol [01:16] <Error405> Ok and I'm keeping the current vertice setup the same. [01:16] <Error405> with the triangle. [01:16] <Error405> So I still keep the 3*sizeof(customvertex) [01:17] <RedBeard> right [01:17] <Error405> Ok, now I leave the rest alone and set up the indexbuffer? [01:17] <RedBeard> put in another thing there, make a new member variable num_tris [01:17] <Error405> so all of this is happening in InitVB? [01:17] <RedBeard> and make it num_tris*3*sizeof(customvertex) [01:17] <RedBeard> yes [01:18] <RedBeard> oh, and for the size of the index buffer... [01:18] <Error405> just leave num_tris 1 for now? [01:18] <RedBeard> sizeof(short)*num_tris [01:18] <RedBeard> yes [01:18] <RedBeard> actually, make another member var, num_verts [01:19] <Error405> 3? [01:19] <RedBeard> and the index buffer will deal with num_tris, and the vertex buffer will deal with num_verts [01:19] <RedBeard> yes [01:19] <RedBeard> remember, member var, not local var [01:19] <Error405> Oh member vart [01:19] <Error405> var [01:19] <Error405> lemme move them [01:20] <Error405> ok for the vertex buffer it isn't num_tris*3*sizeof.. it's num_verts [01:20] <RedBeard> yes [01:20] <RedBeard> and take out the 3 [01:20] <Error405> Ok when I call CreateIndexBuffer I should do it before or after the Lock? [01:21] <RedBeard> the index and vertex buffers are completely independent [01:21] <RedBeard> you have to create it before you lock it, but you can create and lock one, then create and lock the other [01:21] <RedBeard> doesnt matter [01:21] <Error405> alright [01:22] <Error405> ok index buffer is..err.. damn... num_tris*3*sizeof(customvertex)? [01:22] <Error405> oh you rtold me that [01:22] <Error405> sorry [01:23] <RedBeard> sizeof(short)*num_tris [01:23] <Error405> oo short [01:23] <Error405> .. why a short? [01:23] <RedBeard> because you're using 16-bit indices [01:23] <RedBeard> they're smaller, and you're using less than 65,536 vertices [01:24] <RedBeard> also, your hardware probably doesn' support 32-bit indices [01:24] <Error405> ok i understand that, but hmm. It's 1 triangle. I don't need 3 anywhere? [01:24] <RedBeard> my gf2 doesnt [01:24] <RedBeard> oh wait yeah my bad [01:24] <RedBeard> sizeof(short)*num_tris*3 [01:24] <Error405> ah ok [01:24] <RedBeard> :P [01:25] <RedBeard> so, that's created. now to lock it and fill values in [01:25] <Error405> ok the index buffer's usage, it isn't writeonly right? [01:25] <RedBeard> yes, it is [01:25] <RedBeard> you don't need to read values back out of it [01:25] <Error405> oh.. ok [01:25] <RedBeard> if you ever think you'll need to re-read the values in a vertex or index buffer, or texture, or anythng, just keep a copy of it around in your code [01:25] <RedBeard> don't read stuff back through the API [01:26] <Error405> it's slow right? [01:26] <RedBeard> very [01:27] <RedBeard> we can take this back to #silicon3d [01:27] <RedBeard> since i'm not pasting stuff anymore [01:27] <Error405> ah ok -- switch to #silicon3d -- [01:34] <Error405> aight [01:34] <RedBeard> ok, so now you have the index buffer, lock it [01:35] <RedBeard> and then treat the locked data as an array of unsigned shorts [01:35] <Error405> i'm trying to figure out what to memcpy to it.. one moment. [01:35] <RedBeard> uint16 might work [01:35] <RedBeard> and fill in 1,2,3 [01:35] <RedBeard> no wait... 0,1,2 [01:35] <Error405> wait [01:35] <Error405> i don't have to memcpy [01:35] <Error405> ok [01:36] <RedBeard> you can do the same thing with the vertex buffer if you want, casting the pointer to another CUSTOMVERTEX pointer [01:36] <RedBeard> and treating it as an array [01:36] <RedBeard> but the initializer thingy is easy to do [01:36] <RedBeard> so keep it as-is [01:38] <Error405> ok. sorry but I'm having trouble figuring out what to pass in for the size of the index buffer to lock [01:38] <Error405> would it still be g_vertices? [01:39] * Quits: Exellon (guest123@68.112.207.33) (Today is a good day to chat.) [01:40] <RedBeard> passing 0 locks the whole thing [01:40] <Error405> so i do want to lock the entire thing [01:41] <Error405> do I want to do the same with the vertexbuffer since it's already the correct size. [01:41] <RedBeard> but you wanna lock the full size, so you can either use 0 or sizeof(short)*3*num_tris [01:44] <Error405> ok so i'm completely guestimating this, but i'm hoping i'm right, do I memcpy(pVertices,g_Vertices,sizeof(g_Vertices))? [01:44] <Error405> I have a feeling I need to do something else [01:44] <Error405> something dealing with uint16 like you said [01:45] <Error405> damnit I wish I knew exactly what the hell I was doing, I hate being clueless. [01:45] <RedBeard> i recommend you use sizeof(CUSTOMVERTEX)*num_verts [01:45] <Error405> do I still use g_Vertices? [01:45] <RedBeard> that's for the vertex buffer [01:46] <RedBeard> for the index buffer, makea uint16 pointer [01:46] <Error405> ok... [01:46] <Error405> unsigned short? [01:46] <Error405> or uint16 (is confused, thought they were the same) [01:47] <RedBeard> same thing [01:48] <Error405> holy flippin god i'm confused now. [01:48] <Error405> Ok i have this pointer to an ushort [01:48] <RedBeard> unsigned short * pIndices; [01:48] <Error405> yeah made that [01:49] * Quits: masterg (~asd24fid@ip68-8-22-175.sd.sd.cox.net) (night) [01:50] <RedBeard> if(FAILED( ib->Lock(0, sizeof(short)*3*num_tris, (BYTE**)&pIndices,0))) [01:50] <RedBeard> return false; [01:50] * Joins: Washu[AWAY] (direwolf@adsl-64-161-27-214.dsl.sntc01.pacbell.net) [01:50] <X2> [Washu[AWAY]] <nps> masterg: what are you doing this weekend? <A*sassin> HOT SEX ON HIS PARENTS' BED! <A*sassin> uh, i mean... nothing <Masterg> omg, shhh! [01:50] * X2 sets mode: +v Washu[AWAY] [01:50] <RedBeard> that's your lock call [01:50] <Error405> yeah I figured that out [01:50] <Error405> after much thought and hair pulling. [01:50] <RedBeard> now you can go... pIndices[0] = 0 [01:50] <RedBeard> and same for 1 and 2 [01:50] <Error405> whoa [01:51] <Error405> That's different. [01:51] <RedBeard> well, i wouldnt be teaching you anything if there wasnt thought involved :P [01:51] <Error404> pIndices[0] = 0;pIndices[1] = 1;pIndices[2] = 2; [01:51] <RedBeard> yes, you can treat the memory as an array [01:52] <Error404> ? [01:52] <RedBeard> pretty neat huh [01:52] <Error404> yes. [01:52] <Error404> This entire time I've been trying to figure out what the hell i'm memcpy'in [01:52] <RedBeard> that's essentially what a vertex and index buffer store [01:52] <RedBeard> an array of vertices or indices [01:52] <RedBeard> and if you treat it in the correct manner, you can use it as such [01:53] <Error404> awesome... now is that the line after ->lock? [01:53] <RedBeard> yeah [01:53] <RedBeard> and then you can unlock [01:53] <RedBeard> i think that's all for that function [01:53] <Error404> yay! [01:53] <Error404> Ok wait. [01:54] <Error404> I need to make sure I didn't write anything that will format my computer (j) [01:54] <Error404> if(FAILED( pd3dDevice->CreateIndexBuffer(sizeof(short)*num_tris*3,D3DUSAGE_WRITEONLY,D3DFMT_INDEX16, D3DPOOL_DEFAULT, &ib))) [01:55] <Error404> is to create it right? [01:55] <RedBeard> just a slight optimization thing... [01:55] <Error404> hm? [01:55] <RedBeard> im not sure if MSVC is smart enough to resolve the syntax tree when constants are on opposite sides of a variable [01:55] <RedBeard> ie, sizeof(short)*num_tris*3 [01:55] <RedBeard> so put constants together [01:55] <RedBeard> just as a coding style thin [01:56] <RedBeard> sizeof(short)*3*num_tris [01:56] <Error405> ah thank you... [01:56] <RedBeard> that works out to 6*num_tris [01:56] <RedBeard> which is 1 less multiply [01:56] <Error405> so the compiler will do it beforehand since they are constants. [01:56] <RedBeard> im not sure if msvc will optimize it properly the otherway [01:56] <Error405> neat, didn't know that. [01:57] <Error404> ok.. i'm renaming this function, InitVB seems a little wrong now [01:57] <RedBeard> heh [01:58] <RedBeard> InitGeometry perhaps [01:58] <Error404> InitBuffers is what i got... but Geometry seems smarter [01:58] <Error404> lol [01:58] <RedBeard> buffers works too [01:58] <RedBeard> not a big deal [01:59] <Error405> The compiler cares! [01:59] <Error405> hehe ah well ok what's next? [01:59] <Error405> wait wait lemme review this function [01:59] <RedBeard> next, you have to modify your drawing code to use the index buffer [02:00] <RedBeard> make VB, make IB, lock VB, lock IB, fill in vertex data, fill in index data, unlock both [02:00] <RedBeard> roughly in that order [02:01] <Error405> is it ok if you have lock vb, unlock, lock ib, unlock? [02:01] <Error405> with fills between? [02:01] <RedBeard> yeah no problem [02:01] <Error405> ah ok good [02:02] <Error405> ok now change drawing function to use the ib lemme see if i can't figure this out [02:02] <RedBeard> it involves SetIndices [02:02] <RedBeard> just as a starter hint [02:03] <Error405> err.. ok lemme find that [02:04] <Error405> Ok the call would be pd3dDevice->SetIndices(ib,0) but it says something about making memory leaks. so would I set it to pd3dDevice->SetIndices(NULL,NULL) afterwards? [02:05] <RedBeard> possibly [02:05] <RedBeard> not really a problem [02:05] <RedBeard> just do that on program shutdown [02:05] <Error405> it's not? [02:05] <Error405> oh. [02:05] <Error405> ok [02:05] <RedBeard> because if you keep using the same index buffer, or even different ones, there's no need to set it to NULL all the time [02:06] <Error405> ok lets see. so i set the indices then set the streamsource? [02:06] <RedBeard> yeah, don't have to do that in any particular order [02:06] <RedBeard> just set both before calling DrawIndexedPrimitive [02:07] <Error405> ah another hint [02:07] <Error405> one moment [02:07] <RedBeard> heh, i hope im helping without bludgeoning you with the stuff [02:08] <RedBeard> just it's a lot easier when you know which functions you need, it's much less tedious [02:08] <Error405> i would have never figured it out [02:08] <Error405> I don't know the difference lol [02:09] <Error405> ok.. i see how this works but I'm a little confused with one thing. [02:09] <Error405> I understand that i'm using the IndexBuffer now, but how do the coordinate information get rendered if the ib was just fed 0,1,2? [02:09] <RedBeard> what are you giving to SetStreamSource? [02:10] <Error404> d3dDevice->DrawIndexedPrimitive(D3DPT_TRIANGLELIST,0,num_verts,0,num_tris); [02:10] <Error404> pd3dDevice->SetStreamSource(0,ib,sizeof(CUSTOMVERTEX)); [02:10] <Error404> should i keep it vb> [02:10] <Error404> i thikn i should eh? [02:10] <RedBeard> yes [02:10] <RedBeard> streams are used for vertex data [02:10] <RedBeard> indices get their own function [02:11] <Error404> ah. [02:11] <RedBeard> no need to set the same data more than once [02:11] <Error404> ok so what is thedifference? [02:11] <RedBeard> make sense? [02:11] <Error404> I see how it works, somewhat. But I don't see the reasoning behind it. [02:11] <RedBeard> so now you're giving the card vertices through SetStreamSource [02:11] <RedBeard> and you're giving it a set of indices through SetIndices [02:12] <RedBeard> now the card goes through the index array, and collects them in sets of 3 (triangle list) [02:12] <RedBeard> and for each 3, it goes and grabs the vertices at the index indicated [02:12] <Error404> So in this case I could make lots of triangles? [02:12] <RedBeard> so in this case, it grabs vertex 0, vertex 1, vertex 2 [02:12] <RedBeard> and makes a triangle from them [02:12] <RedBeard> then it renders that triangle [02:13] <RedBeard> you can make 2 triangles by adding 1 vertex and 3 indices [02:13] <Error404> Just increase num_tris and then transform it then I'd have lots of triangles using only one vertex buffer with 3 coords? [02:13] <Error404> transform each on that is.. [02:13] <Error404> If that works. [02:13] <Error404> (is hoping thats a reason) [02:13] <RedBeard> well, if you only have 3 coords then you can only make 1 triangle [02:14] <Error404> o [02:14] <Error404> Ok. so it just seperates the data flow? [02:14] <Error404> Oh wait I think I get it. [02:14] <RedBeard> and you can't set the transformation matrices more than once per DP call (DrawPrimitve) [02:15] <RedBeard> dont worry about transforms just yet though [02:15] <Error404> Ok.. so what that one DrawIndexedPrimitive the right call? [02:15] <Error404> d3dDevice->DrawIndexedPrimitive(D3DPT_TRIANGLELIST,0,num_verts,0,num_tris); [02:16] <Error404> i'm drawing a triangle list, with 0 min indeces (i don't know why), with 3(num_verts), 0 as the starting, with 1(num_tris)? [02:17] <RedBeard> ok [02:17] <Error404> I used 0 in SetIndices, so I would use 0 in DIP as well? [02:17] <RedBeard> and you're initializing num_tris to 3 and num_verts to 3*num_tris, right? [02:17] <RedBeard> ah, those are a bit different [02:17] <RedBeard> just use 0 for now, i can explain what they do if you want [02:17] <Error404> Err I thought num_tris was 1 and num_verts was 3? [02:18] <RedBeard> uhm yes, num_tris to 1, num_verts to 3*num_tris [02:18] * RedBeard is a bit tired [02:19] <Error404> is num_verts just 3 or 3*num_tris [02:19] <RedBeard> 3*num_tris [02:19] <Error404> Cause I know there are 3 vertices in a triangle.. [02:19] <Error404> Ah.. hrm ok. [02:19] * Joins: Stinger (tcoleman@210.50.48.33) [02:19] * X2 sets mode: +v Stinger [02:19] <Error404> hm.. ah hmm. oh I see why. [02:19] <Error404> Ah!@ [02:19] <Error404> ok [02:19] <RedBeard> hrmm wait [02:20] <RedBeard> no no, im talking rot [02:20] <RedBeard> just make it 3 [02:20] <Error404> So if I increase the number of triangles then it'd increase it. [02:20] <Error404> It makes sense [02:20] <RedBeard> number of verts and number of tri's aren't really related [02:20] <Error404> It does, really. [02:20] <Error404> oh [02:20] <Error404> damn [02:20] * Error404 hits head [02:20] <RedBeard> you can have 4 verts and 2 tris [02:20] <RedBeard> using 6 indices [02:20] <Error404> o [02:20] <RedBeard> number of indices = 3*num_tris [02:21] <Error404> .. [02:21] <Error404> one moment, computing [02:21] <RedBeard> but since that is always true, you can get away with only storing num_tris [02:21] <RedBeard> but num_verts is stored separately [02:21] <RedBeard> because it's an independent value [02:21] <Error404> num_tris = 1; [02:21] <Error404> num_verts = 3; [02:21] <RedBeard> yeah [02:21] <Error404> ok. [02:21] <RedBeard> see if it compiles [02:21] <Error404> alrighty [02:22] <Error404> err some errors, lemme debug [02:23] <Error404> compiled. [02:23] <Error404> .. i guess i run it eh? [02:23] <RedBeard> yeah give it a go [02:24] <Error404> I HAVE A FRICKEN TRIANGLE!! [02:24] <Error404> MWHAHA [02:24] <RedBeard> a word of caution when using index buffering: [02:24] <Error404> hm? [02:24] <RedBeard> it is entirely possible to fill in a bad index value [02:24] <RedBeard> like 5637 [02:24] <RedBeard> or whatever [02:24] <RedBeard> and it is likely that your computer will bluescreen [02:25] <RedBeard> so take the utmost care when building index buffers [02:25] <Error404> fill in bad index value? like putting in a wrong number in the array? [02:25] <RedBeard> yes [02:25] <Error404> ah, sorta if you for-loop it and it overwrites? [02:25] <RedBeard> make sure you dont put in values that will try to reference non-existent vertices [02:25] <Error404> Ok so lemme try to get this [02:26] <Error404> The vertices i set up with err. [02:26] <Error404> g_Vertices corisponds to the indeces [02:26] <RedBeard> uh kinda yeah [02:26] <Error404> So however many vertices i place in g_vertices there will be that many indeces? [02:26] <RedBeard> the indices index into the vertex buffer [02:27] <RedBeard> not quite [02:27] <Error404> please explain? [02:27] <RedBeard> you just want to make sure that you don't put values into your index buffer that are greater than the number of vertices you're using [02:27] <RedBeard> ie, don't go pIndices[whatever] = 3452; if you only have 10 vertices [02:27] * Error404 feels like making a class with error checking [02:28] <RedBeard> yeah i'd recommend having some kind of error check in debug mode if you're wary of such things [02:28] <RedBeard> but if you're just hardcoding things for now, it's not a big problem [02:28] <RedBeard> just keep it in mind - if your program causes a bluescreen, it's likely an indexing problem [02:28] <Error404> Ok can you tell me what the 0 does in SetIndices and DrawIndexedPrimitive? [02:29] <RedBeard> i'll explain the DIP one first [02:29] <Stinger> uh sdk? [02:29] <Error404> alright. [02:29] <RedBeard> MinIndex [02:29] <RedBeard> and NumIndices [02:29] <RedBeard> basically, that's just an optimization thing [02:29] <Error404> NumVertices? [02:30] <Error405> just making sure we're looking at the same function [02:30] <RedBeard> if the indices that you're using are in the range from 10-20, and don't reference any vertices in the 0-9 range, then you can use MinIndex of 10 [02:30] <Error405> Oh! [02:30] <Error405> sorta like ofsetting during a lock? [02:30] <RedBeard> so the driver only has to load the vertices it will actually use [02:30] <RedBeard> not quite, but similar [02:31] <RedBeard> note that it's the minimum index VALUE, not the minimum index index [02:31] <RedBeard> the starting index is different [02:31] <Error405> ok what do you mean the value? [02:31] <RedBeard> so if you're drawing a quad using index values (10,11,12),(12,11,13), then you can use MinIndex of 10 [02:31] <Error405> because..err.. wait [02:32] <RedBeard> because you aren't using any vertices below that index value [02:32] <Error404> so if I had many shapes within the vertex buffer I could choose which ones to draw? [02:32] <Error404> pIndices[0] = 0; pIndices[1] = 1; pIndices[2] = 2; [02:33] <Error404> are those the values that you're talking about? [02:33] <RedBeard> yes [02:33] <RedBeard> so in that case, your minimum index is 0 [02:33] <RedBeard> so use 0 [02:33] <Error404> And those corispond to the vertex buffer right? [02:33] <Error404> { 150.0f, 50.0f, 0.5f, 1.0f, D3DCOLOR_RGBA(255,255,255,255) }, [02:33] <Error404> { 250.0f, 250.0f, 0.5f, 1.0f, D3DCOLOR_RGBA(0,0,0,128) }, [02:33] <Error404> { 50.0f, 250.0f, 0.5f, 1.0f, D3DCOLOR_RGBA(255,0,0,64) }, [02:33] <RedBeard> right, they index into the vbuffer [02:33] <Error404> g_Vertices[0]-2 [02:33] <Error404> Awesome [02:34] <Error404> It makes sense now. [02:34] <RedBeard> StartIndex [02:34] <RedBeard> you can store lots of indices into an index buffer, and some might pertain to different objects [02:34] <Error404> Is the actual index to start out? [02:34] <Error404> err with [02:35] <RedBeard> so you can use 12 indices for making a set of 4 triangles, and then another 12 for another set [02:35] <RedBeard> but you want to change some state between the renders [02:35] <RedBeard> say, change the texture [02:35] * Quits: SGT-T (SGT-T@66-218-193-35.dialup.fidalgo.net) (Read error to SGT-T[66-218-193-35.dialup.fidalgo.net]: Connection reset by peer) [02:35] <RedBeard> you can store all the indices into the same index buffer, and then give it an offset to start at [02:35] * Joins: Kicknfast (SGT-T@66-218-193-35.dialup.fidalgo.net) [02:35] * X2 sets mode: +v Kicknfast [02:35] <RedBeard> so the first time you'd use 0, and the 2nd time you'd use 12 [02:35] <RedBeard> make sense? [02:36] <Error404> So if i have a triangle in the vb in the index 2-4 then another in 50-52 i'd use StartIndex of 50 to make that triangle? [02:36] <Error404> of course I could just set the value to 50-52 when initializing right? [02:36] <RedBeard> uhm, i think so [02:37] <RedBeard> NumVertices i think is used in a similar fashion to MinIndex [02:37] <RedBeard> essentially, it indicates the MaxIndex [02:37] <RedBeard> except it's relative to MinIndex [02:37] <Error404> so if the IndexBuffer was technically initialized with for(int i,i<50,i++)pIndices[i]=i I would just keep MinIndex and StartIndex the same right? [02:37] <RedBeard> so NumVertices = MaxIndex - MinIndex [02:38] <RedBeard> no, MinIndex and StartIndex are different things entirely [02:38] <Error404> oh [02:38] <RedBeard> for the time being, you can just use 0 for MinIndex and num_verts for NumVertices, in all your calls [02:38] <Error404> lemme reread what you said. [02:39] <RedBeard> but StartIndex corresponds to which index in your index buffer you want to start with [02:39] <RedBeard> so, using indices=(0,1,2, 3,4,5) [02:39] <RedBeard> you can draw the triangle 3,4,5 by setting StartIndex=3 [02:40] <Error404> Oh. [02:40] <RedBeard> that's a kinda bad example, coz the numbers match [02:40] <Error404> So really if I had just had a huge friken list of coords in the vertex buffer. [02:40] <Error404> I could join ones generally next to each other in value [02:40] <RedBeard> so, using indices=(12,15,22, 22,6,80) you still use StartIndex=3 to draw the 2nd triangle (22,6,80) [02:40] <Error404> even if they don't make a shape or whatnot, just for example. [02:41] <RedBeard> yes, that's a part of state-change optimization [02:41] <Error404> Yeah it's the index. [02:41] <RedBeard> ok, so now... add another vertex [02:41] <Error404> Ok. [02:42] * Quits: Stinger (tcoleman@210.50.48.33) (Ping timeout for Stinger[210.50.48.33]) [02:42] <Error404> I'm trying to remember how the coords look lol [02:42] <Error404> It's in LHS.. right? [02:43] <RedBeard> { 150.0f, 450.0f, 0.5f, 1.0f, D3DCOLOR_RGBA(0,255,0,64) }, [02:43] <RedBeard> and add 3 more indices [02:43] <RedBeard> (2,1,3) in that order [02:44] <Error404> huh.. oh [02:44] <Error404> oh. OH [02:44] * Error404 hits head [02:44] <Error404> Now it makes sense [02:44] <Error404> It's the order you're drawing the polygon [02:44] * Error404 kicks self [02:45] <RedBeard> note that i'm using a clockwise ordering, since that's what the original sample you sent me uses [02:45] <Error404> Do i change num_tris and num_verts.. [02:46] <Error404> I put num_verts to 4.. [02:46] <RedBeard> you could turn on culling... D3DCULL_CCW [02:46] <RedBeard> since you're using clockwise winding, you can cull counter-clockwise faces [02:46] <RedBeard> dont worry about culling just yet though [02:47] <Error404> pIndices[0] = 0; pIndices[1] = 1; pIndices[2] = 2; [02:47] <Error404> pIndices[3] = 2; pIndices[4] = 1; pIndices[5] = 3; [02:47] <Error404> I've read the entire section of d3d in Jim Adam's book, i just couldn't implement any of the knowledge. [02:47] <Error404> is that about right? [02:47] <RedBeard> looks good [02:47] <RedBeard> and remember to set num_tris to 2 [02:47] <Error404> heh got that. [02:47] <Error404> should be a quad [02:47] <RedBeard> kinda [02:48] <Error404> Now i understand what you said up there. [02:48] <Error404> I changed the coords [02:48] <Error404> to make a square [02:48] <Error404> hopefully [02:48] <Error404> YAR!! [02:48] <Error404> I gots square! [02:48] <RedBeard> :) [02:48] <RedBeard> ok, now try turning on culling and see what it looks like [02:49] <Error404> oh it was on [02:49] <RedBeard> ok, flip it to use D3DCULL_CW [02:49] <Error404> Or at least I thikn it was [02:49] <Error404> I gots no square! [02:49] <Error404> haha [02:49] <RedBeard> alright [02:49] <RedBeard> now change the indices to be 1,2,3 instead of 2,1,3 [02:49] <RedBeard> and then try both culling modes [02:50] <Error404> ha that's cool [02:51] <RedBeard> that's backface culling [02:51] <RedBeard> handled by the video card [02:51] * Error404 pats his gf [02:51] <Error404> this is awesome [02:51] <Error404> i feel like coding again [02:51] * RedBeard wishes there were someone around to teach him the things he wants to know [02:52] <Error404> so with pd3dDevice->SetIndices(ib,0); i can sorta make a triangle out of that vb? right? [02:52] <Error404> Dude if you need help with guitar I'd help anyday [02:52] <RedBeard> heh i meant programming stuff [02:52] <Error404> Oh yeah you haven't told me what that does [02:52] <RedBeard> dont have me a gi-tar [02:52] <RedBeard> heh [02:52] <Error405> HRESULT DrawIndexedPrimitive( [02:52] <Error405> D3DPRIMITIVETYPE Type, [02:52] <Error405> UINT MinIndex, [02:52] <Error405> UINT NumVertices, [02:52] <RedBeard> ok, the 2nd param of SetIndices [02:52] <Error405> oops [02:52] <Error405> yeah [02:53] <Error405> that one [02:53] <Error405> i hate copying on one computer then pasting on the other [02:53] <RedBeard> that's the "index offset" [02:53] <Error405> damn clipboard should be shared damnit [02:53] <RedBeard> BaseVertexIndex [02:53] <RedBeard> and essentially, it increases the value of all your indices [02:53] <RedBeard> take note that it is a 32-bit value [02:53] <RedBeard> not 16-bit [02:53] <Error405> hm? [02:53] <Error405> yeah [02:53] <Error405> unit [02:54] <Error405> int [02:54] <RedBeard> you can only draw 65,546 things at a time [02:54] <RedBeard> 65536 [02:54] <Error404> really? [02:54] <Error404> doesn't seem like that much =( [02:54] <RedBeard> heh, it is [02:54] <RedBeard> that's per DP call [02:55] <RedBeard> but you can store more than that many things into a vertex buffer [02:55] <RedBeard> so if you want to access the vertex at element 65,537 let's say [02:55] <Error404> ohh [02:55] <RedBeard> you can put an index of 65535 into your index buffer [02:55] <RedBeard> and then use 2 in BaseVertexIndex [02:55] <Error404> and then my other code will stil work [02:55] <RedBeard> or vice versa [02:55] <Error404> if they were all triangles for instance [02:56] <RedBeard> yeah [02:56] <Error404> ok, so lets say that i only want to draw three of these vertices here to make a triangle instead of a quad. [02:56] <RedBeard> so you can use the same index buffer, and index into separate parts of the same vertex buffer using the same indices [02:57] <RedBeard> so you have your quad-drawing index buffer (0,1,2, 2,1,3) right? [02:57] <RedBeard> you can put 8 vertices into the vertex buffer, grouped in 4's [02:57] <Error404> and an index buffer can only have 65546 indices? [02:57] <RedBeard> 65536 [02:57] <Error404> yeah? [02:57] <Error404> ah 36 [02:57] <RedBeard> on a gf2 thats the max you can draw [02:58] <RedBeard> you can use StartIndex to go to a higher index in the buffer [02:58] <RedBeard> so with your 8 vertices in the vbuffer, you have 2 quads [02:58] <RedBeard> you can then go... SetIndices(ib,0); DIP(...); SetIndices(ib,4); DIP(...); [02:58] <RedBeard> and the DIP calls will be the same [02:59] <Error404> ah yeah and it would draw both [02:59] <RedBeard> pretty cool huh [02:59] <Error404> yeah that is cool. [02:59] <RedBeard> so you don't have to rearrange your vertices or your indices, you just set 1 value in a function call [02:59] <Error404> is there any way to choose which vertices you're drawing? [03:00] <RedBeard> like i said before, d3d enforces a pretty optimized method of doing things [03:00] <Error404> say I want to make one very large quad instead of two smaller ones? [03:00] <RedBeard> one large quad? [03:00] <Error404> Yeah assuming that those two quads are next to each other [03:00] <Error404> and the same size. [03:00] <Error404> I could get the far corners and then just make one extremely large quad instead? [03:01] <RedBeard> the positions of the vertices are in the vertex buffer, if you adjust the vertex data then the polygons will reflect the change [03:01] <RedBeard> yes [03:01] <RedBeard> but you'd have to change either the index buffer or the vertex buffer [03:01] <Error404> which is slow right? [03:01] <RedBeard> can be [03:01] <RedBeard> if you do it as a preprocessing step then it's no big deal [03:01] <RedBeard> just try to steer clear of doing it every frame [03:02] <Error404> reminds me of LOD [03:02] <RedBeard> in the case of individual quads, you won't see a big hit [03:02] <RedBeard> but if you're talking about dynamically building index buffers for LOD, that can get slow [03:02] <Error404> So it's good to try to draw as many things with one DP call as you can right? [03:02] <RedBeard> better to adjust the indices than the vertices though, since the indices are 2 bytes each and the vertices are like 32 bytes each [03:02] <RedBeard> BIG difference [03:03] <RedBeard> yes, put as much stuff into one DP as you can [03:03] <Error404> wouldn't that mean it's all one big arse triangle list? [03:03] <RedBeard> yeah, there's a limit to how much you can do in one call [03:04] <Error404> Do they all have to be connected, or is that just with tristrips and stuff? [03:04] <RedBeard> all the triangles drawn must be consecutive in the index list [03:04] <Error404> Ohh [03:04] <RedBeard> they can be totally separate [03:04] <Error404> yeah that's what I was talking about [03:04] <RedBeard> each triangle in a list is drawn independently [03:04] <Error404> Like drawing from index 1, then index 4, [03:04] <Error404> Now i see why you can't [03:04] <Error404> It has to be consecutive [03:04] <RedBeard> there's also a trick when using strips to do the same thing [03:04] <Error404> hm? [03:05] <RedBeard> "degenerate triangles" are triangles that are actually lines or points [03:05] <RedBeard> they have no area, and thus can't be drawn [03:05] <Error404> Ooo [03:05] <Error404> so you draw a line to the other triangles [03:05] <RedBeard> now, to make a degenerate tri, you just give it the same vertex more than once [03:06] <Error404> that's a neat trick [03:06] <Error404> it's fast right? [03:06] <RedBeard> you have to do 2 degenerate tri's for each "jump" though [03:06] <Error404> 2? [03:06] <RedBeard> the video hardware is relatively quick to reject them [03:07] <RedBeard> yes, 2 [03:07] <Error404> what's the reason for needing two? [03:08] <Washu[AWAY]> two get it to have the proper order for rendering the next triangle in the sequence [03:08] <RedBeard> when dealing with a tristrip, the "current triangle" is composed of the vertices at the current, current+1, and current+2 positions [03:08] <Washu[AWAY]> shouldn't that be current, current-1 and current-2 [03:08] <RedBeard> and because of culling, it flip-flops back and forth between CW and CCW culling on each triangle [03:09] <Error404> ah that's right [03:09] <Error404> I remember reading that [03:09] <RedBeard> so to jump and keep the right culling mode, you need to jump twice [03:09] <RedBeard> not if you start at 0 [03:09] <RedBeard> ^ washu [03:09] * Error404 nods [03:09] <Washu[AWAY]> that's right...sorry, its late [03:09] <Washu[AWAY]> why would you start at 0 though when you can start at 2 [03:10] <Error404> So hmm, if I wanted to make a cube i'd have 8 vertices?? [03:10] <Washu[AWAY]> alright, I'm out [03:10] <Error404> I'd also have to do a matrix thingy right? [03:10] <Washu[AWAY]> Latz red, Err, other people that I can't see [03:10] * Quits: Washu[AWAY] (direwolf@adsl-64-161-27-214.dsl.sntc01.pacbell.net) (I think we need to learn to recieve the entire buffer before closing the socket...!) [03:10] <RedBeard> yes 8 vertices [03:10] <RedBeard> how many indices (using a list) [03:11] <Error404> lemme think [03:11] <RedBeard> btw, the benefit of using tristrips is largely done away with when using indexing [03:11] <RedBeard> which is why im getting you to use indexing with lists - more flexible, and still fast [03:11] <Error404> indices are just triangles right? because d3d can't handle primitive quads? [03:11] <RedBeard> yes, for almost everything, a "primitive" is a triangle [03:11] <Error404> ogl can take quads right? [03:11] <RedBeard> it's a little different when using n-patches, but i havent used those [03:12] <RedBeard> uh it can, but it breaks them into triangles internally [03:12] <Error404> so one could easily design directx to do it as well. [03:12] <Error404> soif there are 6 sides. [03:12] <Error404> there are 2 tris per side [03:12] <Error404> 12 indices? [03:13] <RedBeard> 12 faces [03:13] <RedBeard> 12 tri's [03:13] <RedBeard> 36 indices [03:13] * Error404 blikns [03:13] <RedBeard> 6 sides, 12 tri's [03:13] <Error404> so index != tri [03:13] <RedBeard> 36 indices [03:13] <RedBeard> in a list, tri = 3*index [03:13] <Error404> Oh yeah that's right! [03:14] <Error404> Becuase you draw seperate tri's for each [03:14] <RedBeard> right [03:14] <RedBeard> lemme quickly explain why indexing is so good [03:14] <RedBeard> before i head to bed [03:14] <Error404> ok [03:14] <RedBeard> the video card has a "vertex cache" which is different from an L2 cache [03:14] <RedBeard> it also haas an L2 kinda thing [03:14] * Error404 reminds to look up L2 [03:15] <RedBeard> the difference is that L2 is just memory [03:15] * Error404 writes that down [03:15] <RedBeard> and vertex cache is post-transform vertices [03:15] * Quits: kOOktrOOp (kook@c17345.mirnd1.nsw.optusnet.com.au) (Read error to kOOktrOOp[c17345.mirnd1.nsw.optusnet.com.au]: Connection reset by peer) [03:15] <RedBeard> so if you're applying a complex vertex shader, and you go back and use an index again in a 2nd triangle, it can grab the already-transformed vertex from vertex cache without running it through the shader again [03:16] <Error404> oo [03:16] <RedBeard> ie, (0,1,2, 2,1,3) uses 1 and 2 twice [03:16] <RedBeard> so you only compute 4 vertex positions and use them multiple times [03:16] <Error404> i'm assuming that is much faster then [03:16] <Error404> becuase you aren't reading from the vb [03:16] <RedBeard> it can be up to three times faster [03:16] <Error404> yeah that is fast. [03:17] <RedBeard> "did you just say 'three times faster'?" [03:17] <RedBeard> Yes. [03:17] <Error404> haha [03:17] <Error404> that's awesome. [03:17] <RedBeard> remember that the vertex cache is quite small though, around 10 vertices on a gf2 [03:17] <Error404> I wonder how many are on gf3 [03:17] <RedBeard> i think 14 or 18 [03:17] <Error404> why so small? [03:18] <RedBeard> takes a lot of transistors, and it's integrated into the core of the chip [03:18] <RedBeard> = expensive [03:18] <Error404> oh that makes sense then [03:18] <RedBeard> and there are things in d3dx to optimize a mesh for a certain chip, based on the vertex cache size, so that it uses a vertex as many times as possible before it drops out of the cache [03:18] <Error404> so is it smart enough to do all the computations on the available vertices before shoving them away and getting other thins? [03:18] <Error404> ah just what you said [03:18] <Error404> lol [03:19] <RedBeard> that kind of mesh optimization is a freakin complex process [03:19] <RedBeard> because once it drops out of cache, you want to delay using that vertex again until you can get a batch of uses together again [03:19] <RedBeard> while keeping track of all the other vertices at the same time [03:20] <Error404> sounds like it would be impossible to use with tristrips [03:20] <RedBeard> i havent seen a paper that discusses how to do that yet, i might look for one tomorrow [03:20] <Error404> as you're always borrowing at least one vertex from somewhere else. [03:20] <RedBeard> not really, but tristrips make it harder to jump around to use vertex cache well [03:21] <Error404> yeah that makes sense. [03:21] <RedBeard> you don't have to use the vertex that you used on the previous triangle [03:21] <RedBeard> you just have to use it while it's still in cache [03:21] <RedBeard> so you are free to jump around a little [03:21] <Error404> ah. [03:21] <RedBeard> tristrips dont let you jump around, they force you to keep the last 2 vertices [03:22] <RedBeard> so that's another reason to use lists [03:22] <Error404> there isn't much of a diff though right? [03:22] <Error404> Other than the extra drawing and more storage space [03:22] <RedBeard> not a huge difference, but you might be surprised how much performance is gained by avoiding cache misses [03:23] <RedBeard> basically the only difference between indexed tri lists and strips is the amount of memory used [03:23] <RedBeard> and when you have textures taking up 4MB of memory, and index buffers that take up 50K, that's nothing to worry about [03:23] <Error404> heh yeah [03:24] <Error404> and with more and more cards going over 100mb of VRAM and more people getting over 1gb of system ram it's going to be less of a prob [03:24] <Error404> i guess [03:24] <RedBeard> yep [03:24] <Error404> Thank you man, this really helped me a lot. [03:24] <RedBeard> glad to hear it [03:25] <Error404> I've been trying to get someone to help me, but no one seemed to want to. [03:25] <Error404> even the great mittens.. [03:25] <RedBeard> hope i've given enough info for you to start exploring some more stuff [03:25] * Error404 kicks trent. [03:25] <RedBeard> .k mittens[smeep] [03:25] * mittens[smeep] was kicked by X2 (<RedBeard> You're outta-here, mittens[smeep]!) [03:25] * Joins: mittens[smeep] (narf@userd204.torchlake.com) [03:25] * X2 sets mode: +o mittens[smeep] [03:25] <RedBeard> heheh [03:25] <Error404> Yeah I'm going to try to make a cube now, and read up on the other functions i called in the class. [03:25] <RedBeard> good [03:25] <Error404> I know more about DIP and SetIndices than any other. [03:26] <Error404> I like knowing all the possibilities. [03:26] <RedBeard> yep [03:26] <RedBeard> im gonna get some sleep -- the header file, DXanadu.h -- _***font face=Courier New***_ #include <d3d8.h> #ifndef _DXANADU_ #define _DXANADU_ class cDXanadu { public: cDXanadu(); ~cDXanadu(); bool InitD3D(HWND hWnd); bool InitFrame(); bool DoFrame(); void CleanUp(); private: struct CUSTOMVERTEX { float x,y,z,rhw; DWORD color; }; #define D3DFVF_CUSTOMVERTEX (D3DFVF_XYZRHW|D3DFVF_DIFFUSE) bool InitBuffers(); IDirect3D8 *pD3D; IDirect3DDevice8 *pd3dDevice; IDirect3DVertexBuffer8 *vb; IDirect3DIndexBuffer8 *ib; DWORD num_tris; DWORD num_verts; }; #endif _***/font***_ -- the source file, DXanadu.cpp -- _***font face=Courier New***_ #include "DXanadu.h" cDXanadu::cDXanadu() { pD3D = NULL; pd3dDevice = NULL; } cDXanadu::~cDXanadu() { } bool cDXanadu::InitD3D(HWND hWnd) { if(NULL == (pD3D = Direct3DCreate8 (D3D_SDK_VERSION))) return false; D3DDISPLAYMODE d3ddm; if(FAILED (pD3D->GetAdapterDisplayMode(D3DADAPTER_DEFAULT, &d3ddm))) return false; D3DPRESENT_PARAMETERS d3dpp; ZeroMemory(&d3dpp,sizeof(d3dpp)); d3dpp.Windowed = true; d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD; d3dpp.BackBufferFormat = d3ddm.Format; if(FAILED (pD3D->CreateDevice(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hWnd, D3DCREATE_SOFTWARE_VERTEXPROCESSING, &d3dpp, &pd3dDevice))) return false; pd3dDevice->SetRenderState( D3DRS_CULLMODE, D3DCULL_CCW ); return true; } bool cDXanadu::InitFrame() { if(!InitBuffers()) return false; return true; } //make VB, make IB, lock VB, lock IB, fill in vertex data, fill in index data, unlock both bool cDXanadu::InitBuffers() { num_tris = 2; num_verts = 4; CUSTOMVERTEX g_Vertices[] = { { 150.0f, 50.0f, 0.5f, 1.0f, D3DCOLOR_RGBA(255,255,255,255) }, { 250.0f, 50.0f, 0.5f, 1.0f, D3DCOLOR_RGBA(0,0,0,128) }, { 150.0f, 150.0f, 0.5f, 1.0f, D3DCOLOR_RGBA(255,0,0,64) }, { 250.0f, 150.0f, 0.5f, 1.0f, D3DCOLOR_RGBA(0,255,0,255) } }; if(FAILED( pd3dDevice->CreateVertexBuffer(num_verts*sizeof(CUSTOMVERTEX), D3DUSAGE_WRITEONLY, D3DFVF_CUSTOMVERTEX,D3DPOOL_DEFAULT, &vb))) return false; VOID * pVertices; if(FAILED( vb->Lock(0, 0, (BYTE**)&pVertices, 0))) return false; memcpy(pVertices,g_Vertices,sizeof(g_Vertices)); vb->Unlock(); // Creating the Index Buffer if(FAILED( pd3dDevice->CreateIndexBuffer(sizeof(short)*3*num_tris, D3DUSAGE_WRITEONLY, D3DFMT_INDEX16, D3DPOOL_DEFAULT, &ib))) return false; unsigned short * pIndices; if(FAILED( ib->Lock(0, 0, (BYTE**)&pIndices, 0))) return false; pIndices[0] = 0; pIndices[1] = 1; pIndices[2] = 2; pIndices[3] = 2; pIndices[4] = 1; pIndices[5] = 3; ib->Unlock(); return true; } bool cDXanadu::DoFrame() { pd3dDevice->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0,128,255), 1.0f, 0); // Begin the scene pd3dDevice->BeginScene(); // Render Stuff pd3dDevice->SetIndices(ib, 0); pd3dDevice->SetStreamSource(0, vb, sizeof(CUSTOMVERTEX)); pd3dDevice->SetVertexShader(D3DFVF_CUSTOMVERTEX); pd3dDevice->DrawIndexedPrimitive(D3DPT_TRIANGLELIST, 0, num_verts, 0, num_tris); // End the scene pd3dDevice->EndScene(); // Show the backbuffer pd3dDevice->Present(NULL,NULL,NULL,NULL); return true; } void cDXanadu::CleanUp() { pd3dDevice->SetIndices(NULL,NULL); if(vb != NULL) vb->Release(); if(ib != NULL) ib->Release(); if(pd3dDevice != NULL) pd3dDevice->Release(); if(pD3D != NULL) pD3D->Release(); } _***/font***_ Text file last modified on April 28, 2007, 10:28:21 PM, MST. |
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