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  • Sys Admins are kind of like gods, aren't they? [closed]

    - by user75798
    A systems administrator has root access to the entire system. There is nothing they cannot do. They are omnipotent. Their power is absolute. Nothing dan stand before them. Like Sauron, the Dark Lord, they do not share power. There can be but one root. Else contradiction at the most fundamental level is possible, and that can not be tolerated. The sys admin's power is unconditional and non-negotiable. To be a sys admin is like being a god. (And if they are a god, what is the religion?) There is an old saying that absolute power corrupts absolutely. I wonder whether being a sys admin has ended up warping an individual. Perhaps a sys admin has become crazed or even gone berserk? Surely sys admins must need to be very level headed people. For example, imagine being 'the' sys admin for the NSA. (What an awesome job that would be!) Think about the access to data, the encryption keys, the secrets... Perhaps one day a sys admin might go bonkers, turn up for work and 'uninstall the entire NSA'! :) But you would have the same sorts of responsibilities working at a bank or other organization. I wonder whether much emphasis is put on ensuring that sys admins are level headed in the first place and kept sweet in the second. Do they get paid well? I am sure they do not receive half of what they are worth, considering all the hard earned knowledge they have had to gain and the massive responsibility they have.

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  • Could these people get arrested? [closed]

    - by Vinicius Horta
    I have seen many of what is called 'private servers' mmorpg (multiplayer online games), which uses stolen sources,modified executable, clients and server. People launch up their own server using VPS or dedicated server and distribute online service among players disclaiming it has educational purposes only, saying they are studying the game engine and selling items for players disclaming it as 'donations', so it seems like they are getting donations to keep studying. We all know it's a comercial method. All of it is copyrighted material from enterprise ABCD. (ABCD = Fictional name, I'm not mentioning names). At their website they include the following: "Private Server XXXX" does not allow/support any conection to any company/organization associated with the game "XXXX". If you are anyway affiliated with enterprise "XXXXXXX", or any other company/organization associated with the game "XXXX" you may not view/open/read/execute/play/download any part of "Private Server XXXX" nor view "Private Server XXXX" website, if any company/organization requests you to investigate our website/server, you may not view "Private SERVER XXXX" or execute any action mentioned above. Any person caught disobeting this disclaimer will be punish to the fulleste extent of law. Can this guys get arrested? Do they disclaimer works? If I'm owner of enterprise X and I know people stole my source and are using them but they have such disclaimer I'm not allowed to investigate them?

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  • Should I not show all my skills?

    - by Cracker
    I have been programming for a very long time and I have in depth knowledge of several technologies. Recently I applied for a web development job and in my resume I had listed all the skills - HTML, CSS, JavaScript, jQuery, AJAX, PHP, ASP, JSP, C/C++, ARM. Except for C/C++ and ARM I had shown the skill level for all technologies as expert. Many of my friends had applied for the same job and they did not have any web development experience. ALL of them got a call for interview. However I got a rejection saying that we have received applications from very high level candidates and you have not be selected to go to the next level. This has seriously demotivated me. I do not understand why I have been rejected when I had all the required skills and all those who did not have any of the skills have been selected. One reason which I think is that the employer might be thinking that how one person can be an expert in all the technologies. Once in another interview I was told by the HR manager that it is unbelievable that you know ASP, JSP and PHP all in depth as we have different programmers for each of the technology. Such incidents make me very unhappy as in spite of being highly capable of the position I am rejected. Should I not list all my skills in the resume to avoid such situations?

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  • Is there a product planning tool that has these specific features? [closed]

    - by acjohnson55
    I am working on a web startup in the early stages, and we are struggling a bit to manage the scope and scheduling of our product. We have loads of high-level features in the pipeline, but we need a good way of scheduling them for release iterations and breaking them into actual tasks that can be scheduled (that could be a separate tool, but integration would be preferred). I would say that our product can be pretty cleanly divided into "aspects", and we want to be able to separate features by the aspect to which they apply. Perhaps most importantly, it should be really simple to create and move features between target release points. We don't have physical space for a war room type setup, so whatever we settle upon should ideally have a cloud-type web interface. Right now, we're using Excel to make a grid of product aspects vs. target releases, and we store features at the intersections. But this is not providing a good way of indexing tasks to those features or being able to move them around. I would much rather have something that automates the grid overview. I'm less interested in something that helps with low-level scheduling than I am in something that is good at organizing the product plan at the long-term, high-level view. Is there a product planning tool out there that matches these specifications?

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  • How well do graduates from top universities perform and how does it feel compare to the rest of the world?

    - by Amumu
    I always have impressions to those who got admitted into top Universities like MIT, Standford... for studying Engineering. I don't actually know what they are doing in the University or what they will do, but I always feel they can perform higher level tasks with more complexities. I always think that they are good at create and applying mathematical model in real life and I tend to agree: If you can't apply math, it's your problems, not math. I am a junior software engineer on embedded devices. I am learning more on Linux kernel and low level stuffs. Even so, my will is not strong enough to pursue technical path forever, with a final purpose is to create something significant on my own. May I have a chance to get on their level if I keep learning through experience and self-study? In my opinion, Math is the must have requirement, since it seems that programs on those Universities are very Math oriented. Without very strong math skill, how can one perform good in science and researching beyond making regular business products?

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  • PyQt application architecture

    - by L. De Leo
    I'm trying to give a sound structure to a PyQt application that implements a card game. So far I have the following classes: Ui_Game: this describes the ui of course and is responsible of reacting to the events emitted by my CardWidget instances MainController: this is responsible for managing the whole application: setup and all the subsequent states of the application (like starting a new hand, displaying the notification of state changes on the ui or ending the game) GameEngine: this is a set of classes that implement the whole game logic Now, the way I concretely coded this in Python is the following: class CardWidget(QtGui.QLabel): def __init__(self, filename, *args, **kwargs): QtGui.QLabel.__init__(self, *args, **kwargs) self.setPixmap(QtGui.QPixmap(':/res/res/' + filename)) def mouseReleaseEvent(self, ev): self.emit(QtCore.SIGNAL('card_clicked'), self) class Ui_Game(QtGui.QWidget): def __init__(self, window, *args, **kwargs): QtGui.QWidget.__init__(self, *args, **kwargs) self.setupUi(window) self.controller = None def place_card(self, card): cards_on_table = self.played_cards.count() + 1 print cards_on_table if cards_on_table <= 2: self.played_cards.addWidget(card) if cards_on_table == 2: self.controller.play_hand() class MainController(object): def __init__(self): self.app = QtGui.QApplication(sys.argv) self.window = QtGui.QMainWindow() self.ui = Ui_Game(self.window) self.ui.controller = self self.game_setup() Is there a better way other than injecting the controller into the Ui_Game class in the Ui_Game.controller? Or am I totally off-road?

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  • Google Analytics custom variables and how are they recorded?

    - by mrtsherman
    I have been asked to add GA custom variable tracking to my company's website. The company website uses server side includes, so making modifications to the tracking code happens identically everywhere. Maintenance is therefore a headache. Also, GA takes about twenty-four hours for custom variables to start showing up in reports and that makes troubleshooting a headache. So if you have custom variables // visitor level tracking, id = 12345 _gaq.push(['_setCustomVar', 1, 'id', '12345', 1]); // page level tracking, email = [email protected] _gaq.push(['_setCustomVar', 1, 'email', '[email protected]', 1]); The marketing people want the following out of this: User visits site and we record a unique id for them. Whenever they return this id will be used in GA. User signs up for our newsletter on page X and we record their email address. Whenever they return this email address is used in GA. Now a big problem for me is that I don't use GA and the marketing people don't use custom variables. So we don't actually know how this will work. Do I want Page, Session or Visitor level tracking? What happens because the same GA code is used on every page? If they visit the email sign up form and we record the email address, but then they go somewhere else where email is nonexistent will the value get 'overwritten.' Sorry for the long question, but there are a lot of unknowns for a GA noob.

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  • What are all things that do/can happen when a user enters in a web page's URL?

    - by Job
    Sorry if this is a naive title. I am trying to break into web development, which is so far a foreign world to me. I have taken a basic intro to OS, intro to Networking as part of my bachelors degree several years ago. I cannot say that we went into things deeply, beyond academic assignments. I would like to understand things much better regarding to this specific task (e.g what goes on in at the OS level, at networking level, what are other computers involved, where do proxy servers and hackers come in). Again, at the very basic level this has been covered, but I would like to review this specific thing better. Are there chapter(s) os a specific book, or specific SHORT reading that you recommend? I have nothing against your list of 20 favorite books, but I want to understand this one thing better in 2-3 weeks of reading after work / on the weekends (realistically 5-10 hrs per week, so I am looking for about 15-20 hrs of reading material, NO MORE). I am not a fast reader :) Thanks.

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  • Store scores for players and produce a high score list

    - by zrvan
    This question is derived from an interview question that I got for a job I was declined. I have asked for code review for my solution at the dedicated Stack Exchange site. But I hope this question is sufficiently rephrased and asked with a different motivation not to be a duplicate of the other question. Consider the following scenario: You should store player scores in the server back end of a game. The server is written in Java. Every score should be registered, that is, one player may have any number of scores for any number of levels. A high score list should be produced with the fifteen top scores for a given level, but only one score per user (to the effect that even if player X has the two highest scores for level Y, only the first position is counted and player Z has the second place). No information should be persisted and only Java 1.7+ standard libraries should be used. No third party libraries or frameworks are acceptable. With the number of players as the primary factor, what would be the best data structure in terms of scalability and concurrency? How would you access the structure to register a single score given a level and a player id? How would you access the structure to compile the high score list?

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  • Axis Aligned Billboard: how to make the object look at camera

    - by user19787
    I am trying to make an Axis Aligned Billboard with Pyglet. I have looked at several tutorials, but they only show me how to get the Up,Right,and Look vectors. So far this is what I have: target = cam.pos look = norm( target - billboard.pos ) right = norm( Vector3(0,1,0)*look ) up = look*right gluLookAt( look.x, look.y, look.z, self.pos.x, self.pos.y, self.pos.z, up.x, up.y, up.z ) This does nothing for me visibly. Any idea what I'm doing wrong?

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  • Handling keyboard and mouse input (Win API)

    - by Deluxe
    There is a number of ways to catch mouse or keyboard under Windows. So I tried some of them, but every of them has some advantages and drawbacks. I want to ask you: Which method do use? I've tried these: WM_KEYDOWN/WM_KEYUP - Main disadvantage is that, I can't distinguish between left and right-handed keys like ALT, CONTROL or SHIFT. GetKeyboardState - This solves problem of first method, but there is new one. When I get that the Right-ALT key is pressed, I also get that the Left-Control key is down. This behaviour happens only when using localized keyboard layout (Czech - CS). WM_INPUT (Raw Input) - This method also doesn't distinguish left and right-handed keys (if I can remember) and for mouse movement sometimes generates message with zero delta values of mouse position.

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  • Sphere entering in to the cube.unity

    - by Parthi
    I am trying Roll a Ball unity tutorial.Everything is fine,but when I roll the ball it is moving through the cube instead of picking it. my player class is using UnityEngine; using System.Collections; public class player : MonoBehaviour { public float speed; // Use this for initialization // Update is called once per frame void Update () { float h = Input.GetAxis("Horizontal"); float v = Input.GetAxis("Vertical"); Vector3 move = new Vector3(h,0,v); rigidbody.AddForce(move * speed * Time.deltaTime); } void OnTriggerEnter(Collider other) { if(other.gameObject.tag == "Pick up") { other.gameObject.SetActive(false); } } }

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  • XNA: Camera's Rotation and Translation matrices seem to interfere with each other

    - by Danjen
    I've been following the guide here for how to create a custom 2D camera in XNA. It works great, I've implemented it before, but for some reason, the matrix math is throwing me off. public sealed class Camera2D { public Vector2 Origin { get; set; } public Vector2 Position { get; set; } public float Scale { get; set; } public float Rotation { get; set; } } It might be easier to just show you a picture of my problem: http://i.imgur.com/H1l6LEx.png What I want to do is allow the camera to pivot around any given point. Right now, I have the rotations mapped to my shoulder buttons on a gamepad, and if I press them, it should rotate around the point the camera is currently looking at. Then, I use the left stick to move the camera around. The problem is that after it's been rotated, pressing "up" results in it being used relative to the rotation, creating the image above. I understand that matrices have to be applied in a certain order, and that I have to offset the thing to be rotated around the world origin and move it back, but it just won't work! public Matrix GetTransformationMatrix() { Matrix mRotate = Matrix.Identity * Matrix.CreateTranslation(-Origin.X, -Origin.Y, 0.00f) * // Move origin to world center Matrix.CreateRotationZ(MathHelper.ToRadians(Rotation)) * // Apply rotation Matrix.CreateTranslation(+Origin.X, +Origin.Y, 0.00f); // Undo the move operation Matrix mTranslate = Matrix.Identity * Matrix.CreateTranslation(-Position.X, Position.Y, 0.00f); // Apply the actual translation return mRotate * mTranslate; } So to recap, it seems I can have it rotate around an arbitrary point and lose the ability to have "up" move the camera straight up, or I can rotate it around the world origin and have the camera move properly, but not both.

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  • creating a contact listener with sprites from different classes

    - by wilM
    I've been trying to set a contact listener that creates a joint on contact between two sprites which have their own individual classes. Both sprites are inheriting from NSObject and their are initialized in their parentlayer (init method of HelloWorldLayer.mm). It is quite straightforward when everything is in the same class, but in a case like this where sprites have their own classes how will it be done. Please Help, I've been at it for days.

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  • Drawing a rectangular prism using opengl

    - by BadSniper
    I'm trying to learn opengl. I did some code for building a rectangular prism. I don't want to draw back faces so I used glCullFace(GL_BACK), glEnable(GL_CULL_FACE);. But I keep getting back faces also when viewing from front and also sometimes when rotating sides are vanishing. Can someone point me in right direction? glPolygonMode(GL_FRONT,GL_LINE); // draw wireframe polygons glColor3f(0,1,0); // set color green glCullFace(GL_BACK); // don't draw back faces glEnable(GL_CULL_FACE); // don't draw back faces glTranslatef(-10, 1, 0); // position glBegin(GL_QUADS); // face 1 glVertex3f(0,-1,0); glVertex3f(0,-1,2); glVertex3f(2,-1,2); glVertex3f(2,-1,0); // face 2 glVertex3f(2,-1,2); glVertex3f(2,-1,0); glVertex3f(2,5,0); glVertex3f(2,5,2); // face 3 glVertex3f(0,5,0); glVertex3f(0,5,2); glVertex3f(2,5,2); glVertex3f(2,5,0); // face 4 glVertex3f(0,-1,2); glVertex3f(2,-1,2); glVertex3f(2,5,2); glVertex3f(0,5,2); // face 5 glVertex3f(0,-1,2); glVertex3f(0,-1,0); glVertex3f(0,5,0); glVertex3f(0,5,2); // face 6 glVertex3f(0,-1,0); glVertex3f(2,-1,0); glVertex3f(2,5,0); glVertex3f(0,5,0); glEnd();

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  • SharpDX: Render to bitmap using Direct2D 1.1

    - by mwhouser
    I have a command line application that I am currently using SharpDX (Direct2D 1.0) to render to PNG files. This is a window-less application. It's currently creating a SharpDX.WIC.WicBitmap, a WicRenderTarget, then rendering to that. I then save the WicBitmap to the PNG file. For various reasons, I need to migrate to Direct2D 1.1 to take advantage of some of the effects available in 1.1. I'm trying to get a SharpDX.Direct2D1.Bitmap that I can save as PNG. I cannot use FromWicBitmap because that copies the bitmap, it does not share it. I see CreateSharedBitmap in the Direct2D1 API that takes a IWICBitmapLock. However, I do not see this implemented as a constructor of SharpDX.Direct2D.Bitmap. This is what I'm trying to do: // Bunch of setup var d2dDevice = new SharpDX.Direct2D1.Device(dxgiDevice); var d2dDeviceContext = new SharpDX.Direct2D1.DeviceContext(d2dDevice, SharpDX.Direct2D1.DeviceContextOptions.None); using (var wicFactory = new SharpDX.WIC.ImagingFactory()) { using (SharpDX.WIC.Bitmap wicBitmap = new SharpDX.WIC.Bitmap(wicFactory, 500, 500, SharpDX.WIC.PixelFormat.Format32bppPBGRA, SharpDX.WIC.BitmapCreateCacheOption.CacheOnDemand)) { var wicLock = wicBitmap.Lock(SharpDX.WIC.BitmapLockFlags.Write); var props = new SharpDX.Direct2D1.BitmapProperties1(); props.BitmapOptions = SharpDX.Direct2D1.BitmapOptions.Target; var bitmap = new SharpDX.Direct2D1.Bitmap1(d2dDeviceContext, wicLock, props); // This is not available d2dDeviceContext.Target = bitmap; // Do the drawing // Save the PNG } } Is there a way to do what I'm trying to accomplish?

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  • DirectX11 CreateWICTextureFromMemory Using PNG

    - by seethru
    I've currently got textures loading using CreateWICTextureFromFile however I'd like a little more control over it, and I'd like to store images in their byte form in a resource loader. Below is just two sets of test code that return two separate results and I'm looking for any insight into a possible solution. ID3D11ShaderResourceView* srv; std::basic_ifstream<unsigned char> file("image.png", std::ios::binary); file.seekg(0,std::ios::end); int length = file.tellg(); file.seekg(0,std::ios::beg); unsigned char* buffer = new unsigned char[length]; file.read(&buffer[0],length); file.close(); HRESULT hr; hr = DirectX::CreateWICTextureFromMemory(_D3D->GetDevice(), _D3D->GetDeviceContext(), &buffer[0], sizeof(buffer), nullptr, &srv, NULL); As a return for the above code I get Component not found. std::ifstream file; ID3D11ShaderResourceView* srv; file.open("../Assets/Textures/osg.png", std::ios::binary); file.seekg(0,std::ios::end); int length = file.tellg(); file.seekg(0,std::ios::beg); std::vector<char> buffer(length); file.read(&buffer[0],length); file.close(); HRESULT hr; hr = DirectX::CreateWICTextureFromMemory(_D3D->GetDevice(), _D3D->GetDeviceContext(), (const uint8_t*)&buffer[0], sizeof(buffer), nullptr, &srv, NULL); The above code returns that the image format is unknown. I'm clearly doing something wrong here, any help is greatly appreciated. Tried finding anything even similar on stackoverflow, and google to no avail.

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  • Hue, saturation, brightness, contrast effect in hlsl

    - by Vibhore Tanwer
    I am new to pixel shader, and I am trying to write a simple brightness, contrast, hue, saturation effect. I have written a shader for it but I doubt that my shader is not providing me correct result, Brightness, contrast, saturation is working fine, problem is with hue. if I apply hue between -1 to 1, it seems to be working fine, but to make things more sharp, I need to apply hue value between -180 and 180, like we can apply hue in Paint.NET. Here is my code. // Amount to shift the Hue, range 0 to 6 float Hue; float Brightness; float Contrast; float Saturation; float Alpha; sampler Samp : register(S0); // Converts the rgb value to hsv, where H's range is -1 to 5 float3 rgb_to_hsv(float3 RGB) { float r = RGB.x; float g = RGB.y; float b = RGB.z; float minChannel = min(r, min(g, b)); float maxChannel = max(r, max(g, b)); float h = 0; float s = 0; float v = maxChannel; float delta = maxChannel - minChannel; if (delta != 0) { s = delta / v; if (r == v) h = (g - b) / delta; else if (g == v) h = 2 + (b - r) / delta; else if (b == v) h = 4 + (r - g) / delta; } return float3(h, s, v); } float3 hsv_to_rgb(float3 HSV) { float3 RGB = HSV.z; float h = HSV.x; float s = HSV.y; float v = HSV.z; float i = floor(h); float f = h - i; float p = (1.0 - s); float q = (1.0 - s * f); float t = (1.0 - s * (1 - f)); if (i == 0) { RGB = float3(1, t, p); } else if (i == 1) { RGB = float3(q, 1, p); } else if (i == 2) { RGB = float3(p, 1, t); } else if (i == 3) { RGB = float3(p, q, 1); } else if (i == 4) { RGB = float3(t, p, 1); } else /* i == -1 */ { RGB = float3(1, p, q); } RGB *= v; return RGB; } float4 mainPS(float2 uv : TEXCOORD) : COLOR { float4 col = tex2D(Samp, uv); float3 hsv = rgb_to_hsv(col.xyz); hsv.x += Hue; // Put the hue back to the -1 to 5 range //if (hsv.x > 5) { hsv.x -= 6.0; } hsv = hsv_to_rgb(hsv); float4 newColor = float4(hsv,col.w); float4 colorWithBrightnessAndContrast = newColor; colorWithBrightnessAndContrast.rgb /= colorWithBrightnessAndContrast.a; colorWithBrightnessAndContrast.rgb = colorWithBrightnessAndContrast.rgb + Brightness; colorWithBrightnessAndContrast.rgb = ((colorWithBrightnessAndContrast.rgb - 0.5f) * max(Contrast + 1.0, 0)) + 0.5f; colorWithBrightnessAndContrast.rgb *= colorWithBrightnessAndContrast.a; float greyscale = dot(colorWithBrightnessAndContrast.rgb, float3(0.3, 0.59, 0.11)); colorWithBrightnessAndContrast.rgb = lerp(greyscale, colorWithBrightnessAndContrast.rgb, col.a * (Saturation + 1.0)); return colorWithBrightnessAndContrast; } technique TransformTexture { pass p0 { PixelShader = compile ps_2_0 mainPS(); } } Please If anyone can help me learning what am I doing wrong or any suggestions? Any help will be of great value. EDIT: Images of the effect at hue 180: On the left hand side, the effect I got with @teodron answer. On the right hand side, The effect Paint.NET gives and I'm trying to reproduce.

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  • OpenTK C# Loading Model (3DS?) for display and animation

    - by Randomman159
    For the last few days i have been searching for a model importer that support skeletal movement using OpenTK (C#, OpenGL). I am avoiding writing it myself because firstly i am only just learning OpenGL, but also because i don't see why there's a necessity in recreating the wheel. What do you guys use to import your models? I find it interesting that 90% of OpenTK users will import models for various projects, yet i havn't found a single working importer. Could any of you share your code or point me in the direction of a good loader? 3DS files would be best, but anything that can be exported from an autodesk program would be fine, as long as it uses skeleton animation. Thanks for any help :)

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  • Updating resources in SharpDX - why can I not map a dynamic texture?

    - by sebf
    I am trying to map a Texture2D resource in DirectX11 via SharpDX. The resource is declared as a ShaderResource, with Default usage and the 'Write' CPU flag specified. My call however fails with a generic exception from SharpDX: _Parent.Context.MapSubresource(_Resource, 0, SharpDX.Direct3D11.MapMode.Write, SharpDX.Direct3D11.MapFlags.None, out stream); I see from this question that it is supported. The MSDN docs and this other question hint that instead of using Context.MapSubresource() I should be using Texture2D.Map(), however, the DirectX11 Texture2D class does not define Map() (though it does for the DX10 equivalent). If I call the above with MapMode.WriteDiscard, the call succeeds but in this case the previous content of the texture is lost, which is no good when I only want to update a section of it. Has the Map() method been removed in DirectX11 or am I looking in the wrong place? Is the MapSubresource() method unsuitable or am I using it wrong?

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  • Cutting objects and applying texture to cut. Unity3d/C#

    - by Timothy Williams
    Basically what I'm trying to do is figure out how to calculate realtime cutting of objects, and apply a texture to the cut. I found some good scripts, but most of them have been abandoned and aren't really fully working yet. Applying textures: http://forum.unity3d.com/threads/75949-Mesh-Real-Cutting?highlight=mesh+real+cutting Cutting: http://forum.unity3d.com/threads/78594-Object-Cutter Another (Free) Cutter (Also, I'm not entirely sure how this one will handle cutting complex meshes): http://forum.unity3d.com/threads/69992-fake-slicer?p=449114&viewfull=1#post449114 My plan as of right now is to combine links 1 & 2 or 1 & 3 programming wise. What I'm asking here for is any advice on how to advance (links to asset store packages, or other codes to show how to accomplish something complex like this.)

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  • Raycasting "fisheye effect" question

    - by mattboy
    Continuing my exploration of raycasting, I am very confused about how the correction of the fisheye effect works. Looking at the screenshot below from the tutorial at permadi.com, the way I understand the cause of the fisheye effect is that the rays that are cast are distances from the player, rather than the distances perpendicular to the screen (or camera plane) which is what really needs to be displayed. The distance perpendicular to the screen then, in my world, should simply be the distance of Y coordinates (Py - Dy) assuming that the player is facing straight upwards. Continuing the tutorial, this is exactly how it seems to be according to the below screenshot. From my point of view, the "distorted distance" below is the same as the distance PD calculated above, and what's labelled the "correct distance" below should be the same as Py - Dy. Yet, this clearly isn't the case according to the tutorial. My question is, WHY is this not the same? How could it not be? What am I understanding and visualizing wrong here?

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  • Sampler referencing in HLSL - Sampler parameter must come from a literal expression

    - by user1423893
    The following method works fine when referencing a sampler in HLSL float3 P = lightScreenPos; sampler ShadowSampler = DPFrontShadowSampler; float depth; if (alpha >= 0.5f) { // Reference the correct sampler ShadowSampler = DPFrontShadowSampler; // Front hemisphere 'P0' P.z = P.z + 1.0; P.x = P.x / P.z; P.y = P.y / P.z; P.z = lightLength / LightAttenuation.z; // Rescale viewport to be [0, 1] (texture coordinate space) P.x = 0.5f * P.x + 0.5f; P.y = -0.5f * P.y + 0.5f; depth = tex2D(ShadowSampler, P.xy).x; depth = 1.0 - depth; } else { // Reference the correct sampler ShadowSampler = DPBackShadowSampler; // Back hemisphere 'P1' P.z = 1.0 - P.z; P.x = P.x / P.z; P.y = P.y / P.z; P.z = lightLength / LightAttenuation.z; // Rescale viewport to be [0, 1] (texture coordinate space) P.x = 0.5f * P.x + 0.5f; P.y = -0.5f * P.y + 0.5f; depth = tex2D(ShadowSampler, P.xy).x; depth = 1.0 - depth; } // [Standard Depth Calculation] float mydepth = P.z; shadow = depth + Bias.x < mydepth ? 0.0f : 1.0f; If I try and do anything with the sampler reference outside the if statement then I get the following error: Sampler parameter must come from a literal expression This code demonstrates that float3 P = lightScreenPos; sampler ShadowSampler = DPFrontShadowSampler; if (alpha >= 0.5f) { // Reference the correct sampler ShadowSampler = DPFrontShadowSampler; // Front hemisphere 'P0' P.z = P.z + 1.0; P.x = P.x / P.z; P.y = P.y / P.z; P.z = lightLength / LightAttenuation.z; } else { // Reference the correct sampler ShadowSampler = DPBackShadowSampler; // Back hemisphere 'P1' P.z = 1.0 - P.z; P.x = P.x / P.z; P.y = P.y / P.z; P.z = lightLength / LightAttenuation.z; } // Rescale viewport to be [0, 1] (texture coordinate space) P.x = 0.5f * P.x + 0.5f; P.y = -0.5f * P.y + 0.5f; // [Standard Depth Calculation] float depth = tex2D(ShadowSampler, P.xy).x; depth = 1.0 - depth; float mydepth = P.z; shadow = depth + Bias.x < mydepth ? 0.0f : 1.0f; How can I reference the sampler in this manner without triggering the error?

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  • Color sprite tint with opacity in MonoGame/XNA

    - by Piotr Walat
    In MonoGame I am using SpriteBatch to draw sprites. I want to create a semi transparent overlay that would 'tint' the sprite with a given color. SpriteBatch.Draw accepts Color parameter that allows to specify the tint, however the alpha channel seems to make the whole sprite transparent (not the tint only). To address the problem i am overlaying my sprites with another white, semitransparent sprite tinted to a given color. It works as expected, but I am not sure if that is the correct (ie. most optimal) approach. Can you suggest better/faster technique?

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  • How to fix Monogame WP8 Touch Position bug?

    - by Moses Aprico
    Normally below code will result in X:Infinity, Y:Infinity TouchCollection touchState = TouchPanel.GetState(); foreach (TouchLocation t in touchState) { if (t.State == TouchLocationState.Pressed) { vb.ButtonTouched((int)t.Position.X, (int)t.Position.Y); } } Then, I followed this https://github.com/mono/MonoGame/issues/1046 and added below code at the first line in update method. (I still don't know how it's worked, but it fixed the problem) if (_firstUpdate) { typeof(Microsoft.Xna.Framework.Input.Touch.TouchPanel).GetField("_touchScale",System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Static).SetValue(null, Vector2.One); _firstUpdate = false; } And then, when I randomly testing something, there are several area that won't read the user touch. The tile with the purple dude is the area which won't receive user input (It don't even detect "Pressed", the TouchCollection.Count = 0) Any idea how to fix this? UPDATE 1 : The second attempt in recompiling The difference is weird. Dunno why the consistent clickable area is just 2/3 area to the left UPDATE 2 : After trying to rotate to landscape and back to portrait to randomly testing, then the outcome become :

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