Advanced techniques for development of 2D Windows 8 games
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The document outlines advanced techniques for developing 2D games on Windows 8 using DirectX and C++. It covers topics such as cross-device UI design, performance tuning, sprite animation methods, and optimizations for game graphics. Additionally, it includes code examples for implementing techniques like sprite-batching and particle systems.
Advanced techniques for development of 2D Windows 8 games
- 1. Advanced techniques for the development of 2D Windows 8 games using Direct X and C++ Markus Jost CEO, Lead Programmer, Codebox GmbH markus.jost@codebox.ch
- 2. Agenda Recap first Session 5’ Cross-Device UI Design 5’ Performance tuning 15’ Advanced Techniques 15’ Questions 5’
- 6. Illustrating design thoughts by sample
- 9. Texture Atlases © Gango Games <?xml version="1.0" encoding="UTF-8"?> <!-- Created with TexturePacker http://texturepacker.com--> <!-- $TexturePacker:SmartUpdate:963678140e0adc4acab0c90e39ea3d54$ --> <!--Format: n => name of the sprite x => sprite x pos in texture y => sprite y pos in texture w => sprite width (may be trimmed) h => sprite height (may be trimmed) oX => sprite's x-corner offset (only available if trimmed) oY => sprite's y-corner offset (only available if trimmed) oW => sprite's original width (only available if trimmed) oH => sprite's original height (only available if trimmed) r => 'y' only set if sprite is rotated --> <TextureAtlas imagePath="FlySplash.png" width="512" height="1024"> <sprite n="fly_mouth_frame1.png" x="416" y="210" w="56" h="102" r="y"/> <sprite n="fly_mouth_frame2.png" x="416" y="106" w="56" h="102" r="y"/> <sprite n="fly_mouth_frame3.png" x="416" y="2" w="56" h="102" r="y"/> <sprite n="fly_splash_solid.png" x="2" y="2" w="412" h="298"/> <sprite n="fly_wings_frame1.png" x="2" y="412" w="228" h="108"/> <sprite n="fly_wings_frame2.png" x="232" y="314" w="228" h="108"/> <sprite n="fly_wings_frame3.png" x="2" y="302" w="228" h="108"/> </TextureAtlas>
- 10. Build-time processing media Pipeline Direct3D 11: http://code.msdn.microsoft.com/windowsapps/Direct3D-Resource-Loading-25406148
- 16. Sample Pseudo Code for setting Transform: Vector<Sprite*> parents = getParentSprites(); Matrix translation = Matrix.Identity; foreach(Sprite *s in parents) { translation *= s.getTranslationMatrix(); } translation *= getTranslationMatrix(); SetTranslation(translation);
- 17. SpriteSheet Animation Create animation sequences from an Atlas Pros: High level of detail Easy to implement Cons: Very High Memory use Low FPS resolution Hand drawn frames take time
- 18. Bone Animations Create animations using a tool (e.g. Flash) combining body parts Pros: Way less memory consumption Allows many many animations to reuse same texture parts Runs at max FPS Artists are used to using Flash Fast creation Cons: Low level of details Restrictions in design More work to implement
- 19. 3D Animations Use 3D Animations made with 3DSMax or any other 3D Animation Tool Pros: Smooth Animations High Level of Details Depending on LOD, fast production Cons: Doesn’t mix well with 2D GPU intense Also Memory intense due to Animation data
- 20. Used for example for smoke, fire, dust, snow, rain etc. Lots of tiny textures that face the camera Each particle has its own state Position Rotation Scale Color 1 Texture… Using PointSprites, particles have only 1 vertex Usually alpha blended -> performance Avoid filling Particle Sytsems Supported by most GPUs
- 21. Sample
- 22. Implementation Ss = Vh * Si * sqrt(1/(A + B * De + C *( De 2 ))) Vh : Viewport height Si : Initial point size De 2 : The Distance from eye to position A, B, C : User defined values float fPointSize = 1.0f, fPointScaleB = 1.0f; m_d3dDevice->SetRenderState(D3DRS_POINTSPRITEENABLE, true); //create vertices? m_d3dDevice->SetRenderState(D3DRS_POINTSCALEENABLE, true); //use scale function? m_d3dDevice->SetRenderState(D3DRS_POINTSIZE, *((DWORD*)&fPointSize)); m_d3dDevice->SetRenderState(D3DRS_POINTSCALE_B, *((DWORD*)&fPointScaleB)); m_d3dDevice->SetRenderState(D3DRS_ALPHABLENDENABLE,true); m_d3dDevice->SetRenderState(D3DRS_SRCBLEND,D3DBLEND_ONE); m_d3dDevice->SetRenderState(D3DRS_DESTBLEND,D3DBLEND_ONE); #define D3DFVF_CUSTOMVERTEX (D3DFVF_XYZ | D3DFVF_PSIZE | D3DFVF_DIFFUSE) struct D3DVERTEX { float fX, fY, fZ, fSize; DWORD dwColor; }; D3DXCreateTextureFromFile(m_d3dDevice,"texture.png",&pTex); m_d3dDevice->SetTexture(0,pTex); m_d3dDevice->SetStreamSource(0,pVB,0,sizeof(D3DVERTEX)); m_d3dDevice->DrawPrimitive(D3DPT_POINTLIST, 0, numPoints);
- 24. On Windows 8 http://code.msdn.microsoft.com/windowsapps/DWriteHelloWorld-760793d2 On Windows Phone 8 Or use BitmapFonts http://directxtk.codeplex.com/ http://www.71squared.com/en/glyphdesigner