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• Stencil buffer appears to not be decrementing values correctly

  - by Alex Ames

  I'm attempting to use the stencil buffer as a clipper for my UI system, but I'm having trouble debugging a problem I'm running in to. This is what I'm doing: A widget can pass a rectangle to the the stencil clipper functions, which will increment the stencil buffer values that it covers. Then it will draw its children, which will only get drawn…

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• sdl stencil buffer

  - by noddy

  I am trying to use the stencil buffer for rendering reflection and am working with SDL and OpenGL. When I give the command SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE,8),I get a return value of 0 indicating success,but when I try to get the size allocated using SDL_GL_GetAtribute( SDL_GL_STENCIL_SIZE,&i),I get a value of 0 for my stencil buffer…

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• Stencil mask with AlphaTestEffect

  - by Brendan Wanlass

  I am trying to pull off the following effect in XNA 4.0: http://eng.utah.edu/~brendanw/question.jpg The purple area has 50% opacity. I have gotten pretty close with the following code: public static DepthStencilState AlwaysStencilState = new DepthStencilState() { StencilEnable = true, StencilFunction =…

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• Clipping polygons in XNA with stencil (not using spritebatch)

  - by Blau

  The problem... i'm drawing polygons, in this case boxes, and i want clip children polygons with its parent's client area. // Class Region public void Render(GraphicsDevice Device, Camera Camera) { int StencilLevel = 0; Device.Clear( ClearOptions.Stencil, Vector4.Zero, 0, StencilLevel ); Render(…

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• New Windows Phone 7 Stencil For Cacoo

  - by Tim Murphy

  I have created a stencil for wire framing Windows Phone 7 application in Cacoo.  This is definitely a work in progress, but until it is complete I would suggest combining this stencil with the Android stencil that is available by default in Cacoo.  Below are a couple of screen shots of the stencil so far. First here is…

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• Correcting Lighting in Stencil Reflections

  - by Reanimation

  I'm just playing around with OpenGL seeing how different methods of making shadows and reflections work. I've been following this tutorial which describes using GLUT_STENCIL's and MASK's to create a reasonable interpretation of a reflection. Following that and a bit of tweaking to get things to work, I've come up with the code…

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• How can I write only to the stencil buffer in OpenGL ES 2.0?

  - by stephelton

  I'd like to write to the stencil buffer without incurring the cost of my expensive shaders. As I understand it, I write to the stencil buffer as a 'side effect' of rendering something. In this first pass where I write to the stencil buffer, I don't want to write anything to the color or depth buffer, and I definitely don't want…

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• Unable to get Stencil Buffer to work in iOS 4+ (5.0 works fine). [OpenGL ES 2.0]

  - by MurderDev

  So I am trying to use a stencil buffer in iOS for masking/clipping purposes. Do you guys have any idea why this code may not work? This is everything I have associated with Stencils. On iOS 4 I get a black screen. On iOS 5 I get exactly what I expect. The transparent areas of the image I drew in the stencil are the only areas…

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• How can I mark a pixel in the stencil buffer?

  - by János Turánszki

  I never used the stencil buffer for anything until now, but I want to change this. I have an idea of how it should work: the gpu discards or keeps rasterized pixels before the pixel shader based on the stencil buffer value on the given position and some stencil operation. What I don't know is how would I mark a pixel in the…

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• Does OpenGL stencil test happen before or after fragment program runs?

  - by david

  When I set glStencilFunc( GL_NEVER, . . . ) effectively disabling all drawing, and then run my [shader-bound] program I get no performance increase over letting the fragment shader run. I thought the stencil test happened before the fragment program. Is that not the case, or at least not guaranteed? Replacing the fragment…

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• D3D11 how to simulate multiple depth channels

  - by Nock

  Here's what I'd like to achieve: Rendering a first pass of objects in my scene, using standard depth comparison Rendering another pass of objects in the same scene, but with the following rules: A Pixel of the 2nd pass always override the first pass (no depth compare between them) Use Depth comparison between pixels…

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• Real time soft shadows without stencil buffers

  - by Tomh

  I'm really curious how the following is done They seem to achieve real time softish shadows on the iphone which does not have a stencil buffer available. It seems to run pretty fluid here http://www.youtube.com/watch?v=u5OM6tPoxLU Anyone has an idea?

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• [SOLVED] How to create a FBO with stencil buffer in OpenGL ES 2.0?

  - by Alphones

  I need stencil buffer on 3GS to render planar shadow, and polygon offset won't work prefect, still has z-fighting problem. So I use stencil buffer to make the shadow correct, it works on win32 gles2 emulator, but not on iPhone. After I added a post effect to the whole scene. The stencil buffer won't work even on win32…

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• How could I create a FBO with stencil buffer in OpenGL ES 2.0?

  - by Alphones

  I need stencil buffer on 3GS to render planar shadow, and polygon offset won't work prefect, still has z-fighting problem. So I use stencil buffer to make the shadow correct, it works on win32 gles2 emulator, but not on iPhone. After I added a post effect to the whole scene. The stencil buffer won't work even on win32…

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• OpenGl: Stencil buffer problem (Wall + Window)?!

  - by Shaza

  Hwy all, I want to create a wall with a window inside, using stencil buffer. My code looks like this: glEnable(GL_STENCIL_TEST); glClearStencil(0); glClear(GL_STENCIL_BUFFER_BIT); glStencilMask(1); glStencilFunc(GL_ALWAYS, 1, 1); glStencilOp(GL_REPLACE, GL_REPLACE, GL_REPLACE); glDisable(GL_DEPTH_TEST); …

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• Can't use the hardware scissor any more, should I use the stencil buffer or manually clip sprites?

  - by Alex Ames

  I wrote a simple UI system for my game. There is a clip flag on my widgets that you can use to tell a widget to clip any children that try to draw outside their parent's box (for scrollboxes for example). The clip flag uses glScissor, which is fed an axis aligned rectangle. I just added arbitrary rotation…

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• Why 32-bit color EGL configurations fail with EGL_BAD_MATCH on Moto Droid?

  - by Gilead

  I'm trying to figure out why certain EGL configurations cause eglMakeCurrent() call to return EGL_BAD_MATCH on Motorola Droid running Android 2.1u1. This is a full list of hardware-accelerated EGL configurations (those with EGL_CONFIG_CAVEAT == EGL_NONE) as there's a few others with EGL_CONFIG_CAVEAT ==…

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• Trying to use stencils in 2D while retaining layer depth

  - by Steve

  This is a screen of what's going on just so you can get a frame of reference. http://i935.photobucket.com/albums/ad199/fobwashed/tilefloors.png The problem I'm running into is that my game is slowing down due to the amount of texture swapping I'm doing during my draw call. Since walls, characters,…

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• How do I add shadow mapping?

  - by Jasper Creyf

  How do I add shadow mapping? I don't care if it uses GLSL it just has to work. I have been searching on stencil shadows and shadow mapping, all the examples given did nothing, if you don't understand that it means not even a single shadow is even being rendered. If you know how to add stencil…

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• What is the format of DXGI_FORMAT_D24_UNORM_S8_UINT?

  - by bobobobo

  I'm trying to read the values in a depth texture of type DXGI_FORMAT_D24_UNORM_S8_UINT. I know this means "24 bits for depth, 8 bits for stencil" "A 32-bit z-buffer format that supports 24 bits for depth and 8 bits for stencil.", but how do you interpret those 24 bits? It's clearly not…

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• Draw contour around object in Opengl

  - by Maciekp

  I need to draw contour around 2d objects in 3d space. I tried drawing lines around object(+points to fill the gap), but due to line width, some part of it(~50%) was covering object. I tried to use stencil buffer, to eliminate this problem, but I got sth like this(contour is green): …

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• Draw contour around object in Opengl

  - by Maciekp

  I need to draw contour around 2d objects in 3d space. I tried drawing lines around object(+points to fill the gap), but due to line width, some part of it(~50%) was covering object. I tried to use stencil buffer, to eliminate this problem, but I got sth like this(contour is green): …

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• Unable to locate a specific shape in Visio

  - by Gnanam

  I'm trying to create (convert) a Visio architecture diagram from an existing image which is available in the format of JPG extension. My question is, in this complete architecture diagram which I'm trying to convert, there is one specific shape/symbol which I couldn't able to…

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• Best tools for creating website wireframes

  - by Alison

  When creating a wireframe for a website, I always start with a Visio wireframe stencil from Garrett Dimon. The stencil is amazing but it has been a few years since it has been updated and I'm looking for something new and exciting. What wireframing tool(s) do you use, if…

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• "Accumulate" buffer results in XNA4?

  - by Utkarsh Sinha

  I'm trying to simulate a "heightmap" buffer in XNA4.0 but the results don't look correct. Here's what I'm hoping to achieve: http://www.youtube.com/watch?feature=player_detailpage&v=-Q6ISVaM5Ww#t=517s (8:38). From what I understand, here are the steps to reach there: …

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