Applying an offset during runtime, MAKE THE SQUARES MOVE

Jonathan Coleman · 2018-09-05T02:15:29

I have been googling up and down translation in DirectX. I've seen plenty of tutorials on how to accomplish translation using matrices and I have accomplished the task before in OpenGL. However, I started using DirectX and I am using a vertex buffer and pushing it to a vertex shader for processing. I'm trying to figure out, where in the process, and what objects come into play, when dynamically translating -specific- sets of vertices. For instance, if I have two squares, and I push my vertices for my squares into my vertex buffer, after this is accomplished, where do I apply my offsets? Is it in the shader? If so, how to pass my offsets to the shader so that it knows which vertices to apply which offset? Or, do I recreate my vertex buffer every time translation occurs (could be many times in a frame from user input or whatnot, this doesn't seem right to me). Does anyone have some good material on simple 2d/3d translation during runtime with vertex buffers, or some quick tips on how you might accomplish such a thing. So, I set up my renderable objects: Game::Game(HWND hWnd) { Renderable_Object * square1 = new Renderable_Object(-50, -50, 0, 0); Renderable_Object * square2 = new Renderable_Object(-0, -0, 50, 50); Game_Objects.push_back(square1); Game_Objects.push_back(square2); renderer = new Renderer(hWnd, Game_Objects); } In my renderer, I set up my vertex buffer, along with my other directx junk: void Renderer::InitGraphics(std::vector<Renderable_Object*> Game_Objects) { for (int i = 0; i < Game_Objects.size(); i++) { for (int j = 0; j < Game_Objects[i]->getVertices().size(); j++) { OurVertices.push_back(Game_Objects[i]->getVertices()[j]); } } createVertexBuffer(); createConstantBuffer(); } Then, after all is said and done, I draw the stuff, see below for my commented question: void Renderer::Update() { // clear the back buffer to a deep blue devcon->ClearRenderTargetView(backbuffer, D3DXCOLOR(0.0f, 0.2f, 0.4f, 1.0f)); // Here is where I imagine I will have to do alterations and translation on my vertices based on input // my problem is not how to do this, like, the math part, applying an offset and junk like that... // my problem is what do I change right here, in order to make my squares move? // should I rebind my vertex buffer after applying some kind of offset? // like, another createVertexBuffer();? // or, is there some way to tell the shader to apply the offset for a specific group of vertices? // help please! // select which vertex buffer to display UINT stride = sizeof(Vertex); UINT offset = 0; devcon->IASetVertexBuffers(0, 1, &pVBuffer, &stride, &offset); // select which primtive type we are using devcon->IASetPrimitiveTopology(D3D10_PRIMITIVE_TOPOLOGY_TRIANGLELIST); // draw the vertex buffer to the back buffer devcon->Draw(12, 0); // switch the back buffer and the front buffer swapchain->Present(0, 0); } // Here is where I imagine I will have to do alterations and translation on my vertices based on input // my problem is not how to do this, like, the math part, applying an offset and junk like that... // my problem is what do I change right here, in order to make my squares move? // should I rebind my vertex buffer after applying some kind of offset? // like, another createVertexBuffer();? // or, is there some way to tell the shader to apply the offset for a specific group of vertices? // help please! Thanks for your help in advance!

Graphics and GPU Programming Programming

Started by JWColeman September 02, 2018 03:12 AM

20 comments, last by JWColeman 6 years, 5 months ago

JWColeman

Author

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September 05, 2018 02:15 AM

At first instancing sounded like it wouldnt be useful in my case, but then i realized I was thinking about 3d complex objects, where in reality, in my 2d world, basically everything is a rectangle or square.

If the proper way to accomplish my task is through instancing, and it would he rather inefficient to set a loop around my draw call, then that is the direction I will head!

Thanks all!

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Applying an offset during runtime, MAKE THE SQUARES MOVE

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Applying an offset during runtime, MAKE THE SQUARES MOVE

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