energetic pixels - Page 14

key size in iphone keyppad

- by pooja

what is key size in pixels for iphone keyboard??

Bsplayer - load audio tracks from external files

I have a movie file: Video ID : 1 Format : AVC Format/Info : Advanced Video Codec Format profile : [email protected] Format settings, CABAC : Yes Format settings, ReFrames : 5 frames Muxing mode : Container [email protected] Codec ID : V_MPEG4/ISO/AVC Duration : 54mn 13s Bit rate : 3 380 Kbps Nominal bit rate : 3 459 Kbps Width : 1 280 pixels Height : 720 pixels Display aspect ratio : 16:9 Frame rate : 23.976 fps Resolution : 8 bits Colorimetry : 4:2:0 Scan type : Progressive Bits/(Pixel*Frame) : 0.153 Stream size : 1.28 GiB (88%) Writing library : x264 core 88 r1471 1144615 Audio ID : 2 Format : AC-3 Format/Info : Audio Coding 3 Codec ID : A_AC3 Duration : 54mn 16s Bit rate mode : Constant Bit rate : 384 Kbps Channel(s) : 6 channels Channel positions : Front: L C R, Side: L R, LFE Sampling rate : 48.0 KHz Stream size : 149 MiB (10%) and additional audio files in same folder: .mp3 and .ac3. How can I load them with bsplayer? Right click-audio-audio streams is empty. If i open the movie with media players classic I can switch audio files.

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How to stretch the image from one screen to two screens

- by wxiiir

I want to be able to stretch the image from one monitor to a second monitor even if i have to use some software to do it. For example i want the top half of the image that is now shown on my first monitor to occupy the whole second monitor and i want the bottom half to occupy the whole first monitor, or the other way around i don't really care as long as it works. I would be cool to know how to do the same stuff but to the left half and right half. I know that image pixels would have twice the lenght or height this way but i don't really care about it as long as it works so basically i want the stuff to show on both monitors but with the same pixels as before. I have a hd4870 and windows7 and hd4000 family doesnt support having two monitors behaving like a large one, only hd5000 upwards, this would solve my problems without any of the drawbacks but it just can't be done (or maybe it can via software but i'm just too tired of searching). A solution to make almost any graphic card have two monitors behaving like a large one is matrox dualhead2go but that's just as expensive as a good hd5000 card so it's not worth it. thanks in advance EDIT I guess that nobody so far was able to fully comprehend my problem that was very explicitly written but i will elaborate some more. My hd4870 can have 2 monitors working with it but some stuff like games won't run on both monitors, which sucks. There are some ways to circumvent this problem and two of them are perfect or almost perfect but expensive and the third would be a software solution that would make it possible. The first one is to have and hd5000 family video card which will work just fine with both monitors. The second is to have a matrox dualhead2go that will make my hd4870 detect my two monitors as a large monitor. The third is to have a software that makes my two displays be detected as a large display and then captures the output of the video card, splits the images and renders them as 2d images to both monitors OR a simpler one but that would make outputted pixels double the width or height would be to capture the output of the graphics card to one screen, split it in two and enlarge it to fit both monitors and then output it to the monitors. p.s. By capturing the output of the video card i mean just make the video card process the stuff in a certain way. Making the video card detect two monitors as a large one via software may be a bit impossible or impracticable but stretching the output as a 2d image from one to both monitors for some coders should be a walk in the park so it would be likely that such program would exist or that some widespread softwares for dual monitor would have such function in them.

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Refactoring a javascript array rotate function

- by ideotop

I wrote a rotate function, but I'm not satisfied with it: var pixels=['011','110','000']; var result=new Array(); result=['000','000','000']; for ( y=0; y<(pixels.length); y++ ){ for ( x=0; x<(pixels.length); x++ ){ var newx=0,newy=0; if ( clock ){ if ( x< r.x && y< r.y ) {newx=x+2;newy=y ;}//top left if ( x==r.x && y< r.y ) {newx=x+1;newy=y+1;}//top if ( x> r.x && y< r.y ) {newx=x ;newy=y+2;}//top right if ( x< r.x && y==r.y ) {newx=x+1;newy=y-1;}//left if ( x==r.x && y==r.y ) {newx=x ;newy=y ;}//center if ( x> r.x && y==r.y ) {newx=x-1;newy=y+1;}//right if ( x< r.x && y> r.y ) {newx=x ;newy=y-2;}//bottom left if ( x==r.x && y> r.y ) {newx=x-1;newy=y-1;}//bottom if ( x> r.x && y> r.y ) {newx=x-2;newy=y ;}//bottom right } else { if ( x< r.x && y< r.y ) {newx=x ;newy=y+2;}//top left if ( x==r.x && y< r.y ) {newx=x-1;newy=y+1;}//top if ( x> r.x && y< r.y ) {newx=x-2;newy=y ;}//top right if ( x< r.x && y==r.y ) {newx=x+1;newy=y+1;}//left if ( x==r.x && y==r.y ) {newx=x ;newy=y ;}//center if ( x> r.x && y==r.y ) {newx=x-1;newy=y-1;}//right if ( x< r.x && y> r.y ) {newx=x+2;newy=y ;}//bottom left if ( x==r.x && y> r.y ) {newx=x+1;newy=y-1;}//bottom if ( x> r.x && y> r.y ) {newx=x ;newy=y-2;}//bottom right } //inject(result,newx,newy,pixels[y][x]) } } does someone now how to write a cleaner code for this rotate (clock and counter-clock) function ?

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[BEGINNER] Javascript Pop Ups

- by user566312

Hey All, My boss has asked for a page that will not change to have two timed pop ups load. I have found code and edited it to what I had thought it should do, but it is only loading the last onLoad event. I am a designer and I have helped with making webpages, but Javascript is so far outside of what I can understand. I have already learned how to use the single pop up and spent a whiiile learning the timeouts, but I cannot seem to get it to work with multiple popup functions. If you have a moment, would you take a look? Thank you :) h <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>H's Page 1</title> <SCRIPT LANGUAGE="JavaScript">      </script>   </head> <body OnLoad="doPopup1(); doPopup2();"> <p>My page text.</p> <p>My page text.</p> <p>My page text.</p> <p>My page text.</p> </body> </html>

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Android - determine specific locations (X,Y coordinates) on a Bitmap on different resolutions?

- by Mike

My app that I am trying to create is a board game. It will have one bitmap as the board and pieces that will move to different locations on the board. The general design of the board is square, has a certain number of columns and rows and has a border for looks. Think of a chess board or scrabble board. Before using bitmaps, I first created the board and boarder by manually drawing it - drawLine & drawRect. I decided how many pixels in width the border would be based on the screen width and height passed in on "onSizeChanged". The remaining screen I divided by the number of columns or rows I needed. For examples sake, let's say the screen dimensions are 102 x 102. I may have chosen to set the border at 1 and set the number of rows & columns at 10. That would leave 100 x 100 left (reduced by two to account for the top & bottom border, as well as left/right border). Then with columns and rows set to 10, that would leave 10 pixels left for both height and width. No matter what screen size is passed in, I store exactly how many pixels in width the boarder is and the height & width of each square on the board. I know exactly what location on the screen to move the pieces to based on a simple formula and I know exactly what cell a user touched to make a move. Now how does that work with bitmaps? Meaning, if I create 3 different background bitmaps, once for each density, won't they still be resized to fit each devices screen resolution, because from what I read there were not just 3 screen resolutions, but 5 and now with tablets - even more. If I or Android scales the bitmaps up or down to fit the current devices screen size, how will I know how wide the border is scaled to and the dimensions of each square in order to figure out where to move a piece or calculate where a player touched. So far the examples I have looked at just show how to scale the overall bitmap and get the overall bitmaps width and height. But, I don't see how to tell how many pixels wide or tall each part of the board would be after it was scaled. When I draw each line and rectangle myself based in the screen dimensions from onSizeChanged, I always know these dimensions. If anyone has any sample code or a URL to point me to that I can a read about this with bitmaps, I would appreciate it. Thanks, --Mike BTW, here is some sample code (very simplified) on how I know the dimensions of my game board (border and squares) no matter the screen size. Now I just need to know how to do this with the board as a bitmap that gets scaled to any screen size. @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { intScreenWidth = w; intScreenHeight = h; // Set Border width - my real code changes this value based on the dimensions of w // and h that are passed in. In other words bigger screens get a slightly larger // border. intOuterBorder = 1; /** Reserve part of the board for the boardgame and part for player controls & score My real code forces this to be square, but this is good enough to get the point across. **/ floatBoardHeight = intScreenHeight / 4 * 3; // My real code actually causes floatCellWidth and floatCellHeight to // be equal (Square). floatCellWidth = (intScreenWidth - intOuterBorder * 2 ) / intNumColumns; floatCellHeight = (floatBoardHeight - intOuterBorder * 2) / intNumRows; super.onSizeChanged(w, h, oldw, oldh); }

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Parallelism in .NET – Part 2, Simple Imperative Data Parallelism

- by Reed

In my discussion of Decomposition of the problem space, I mentioned that Data Decomposition is often the simplest abstraction to use when trying to parallelize a routine. If a problem can be decomposed based off the data, we will often want to use what MSDN refers to as Data Parallelism as our strategy for implementing our routine. The Task Parallel Library in .NET 4 makes implementing Data Parallelism, for most cases, very simple. Data Parallelism is the main technique we use to parallelize a routine which can be decomposed based off data. Data Parallelism refers to taking a single collection of data, and having a single operation be performed concurrently on elements in the collection. One side note here: Data Parallelism is also sometimes referred to as the Loop Parallelism Pattern or Loop-level Parallelism. In general, for this series, I will try to use the terminology used in the MSDN Documentation for the Task Parallel Library. This should make it easier to investigate these topics in more detail. Once we’ve determined we have a problem that, potentially, can be decomposed based on data, implementation using Data Parallelism in the TPL is quite simple. Let’s take our example from the Data Decomposition discussion – a simple contrast stretching filter. Here, we have a collection of data (pixels), and we need to run a simple operation on each element of the pixel. Once we know the minimum and maximum values, we most likely would have some simple code like the following: for (int row=0; row < pixelData.GetUpperBound(0); ++row) { for (int col=0; col < pixelData.GetUpperBound(1); ++col) { pixelData[row, col] = AdjustContrast(pixelData[row, col], minPixel, maxPixel); } } .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } This simple routine loops through a two dimensional array of pixelData, and calls the AdjustContrast routine on each pixel. As I mentioned, when you’re decomposing a problem space, most iteration statements are potentially candidates for data decomposition. Here, we’re using two for loops – one looping through rows in the image, and a second nested loop iterating through the columns. We then perform one, independent operation on each element based on those loop positions. This is a prime candidate – we have no shared data, no dependencies on anything but the pixel which we want to change. Since we’re using a for loop, we can easily parallelize this using the Parallel.For method in the TPL: Parallel.For(0, pixelData.GetUpperBound(0), row => { for (int col=0; col < pixelData.GetUpperBound(1); ++col) { pixelData[row, col] = AdjustContrast(pixelData[row, col], minPixel, maxPixel); } }); Here, by simply changing our first for loop to a call to Parallel.For, we can parallelize this portion of our routine. Parallel.For works, as do many methods in the TPL, by creating a delegate and using it as an argument to a method. In this case, our for loop iteration block becomes a delegate creating via a lambda expression. This lets you write code that, superficially, looks similar to the familiar for loop, but functions quite differently at runtime. We could easily do this to our second for loop as well, but that may not be a good idea. There is a balance to be struck when writing parallel code. We want to have enough work items to keep all of our processors busy, but the more we partition our data, the more overhead we introduce. In this case, we have an image of data – most likely hundreds of pixels in both dimensions. By just parallelizing our first loop, each row of pixels can be run as a single task. With hundreds of rows of data, we are providing fine enough granularity to keep all of our processors busy. If we parallelize both loops, we’re potentially creating millions of independent tasks. This introduces extra overhead with no extra gain, and will actually reduce our overall performance. This leads to my first guideline when writing parallel code: Partition your problem into enough tasks to keep each processor busy throughout the operation, but not more than necessary to keep each processor busy. Also note that I parallelized the outer loop. I could have just as easily partitioned the inner loop. However, partitioning the inner loop would have led to many more discrete work items, each with a smaller amount of work (operate on one pixel instead of one row of pixels). My second guideline when writing parallel code reflects this: Partition your problem in a way to place the most work possible into each task. This typically means, in practice, that you will want to parallelize the routine at the “highest” point possible in the routine, typically the outermost loop. If you’re looking at parallelizing methods which call other methods, you’ll want to try to partition your work high up in the stack – as you get into lower level methods, the performance impact of parallelizing your routines may not overcome the overhead introduced. Parallel.For works great for situations where we know the number of elements we’re going to process in advance. If we’re iterating through an IList<T> or an array, this is a typical approach. However, there are other iteration statements common in C#. In many situations, we’ll use foreach instead of a for loop. This can be more understandable and easier to read, but also has the advantage of working with collections which only implement IEnumerable<T>, where we do not know the number of elements involved in advance. As an example, lets take the following situation. Say we have a collection of Customers, and we want to iterate through each customer, check some information about the customer, and if a certain case is met, send an email to the customer and update our instance to reflect this change. Normally, this might look something like: foreach(var customer in customers) { // Run some process that takes some time... DateTime lastContact = theStore.GetLastContact(customer); TimeSpan timeSinceContact = DateTime.Now - lastContact; // If it's been more than two weeks, send an email, and update... if (timeSinceContact.Days > 14) { theStore.EmailCustomer(customer); customer.LastEmailContact = DateTime.Now; } } Here, we’re doing a fair amount of work for each customer in our collection, but we don’t know how many customers exist. If we assume that theStore.GetLastContact(customer) and theStore.EmailCustomer(customer) are both side-effect free, thread safe operations, we could parallelize this using Parallel.ForEach: Parallel.ForEach(customers, customer => { // Run some process that takes some time... DateTime lastContact = theStore.GetLastContact(customer); TimeSpan timeSinceContact = DateTime.Now - lastContact; // If it's been more than two weeks, send an email, and update... if (timeSinceContact.Days > 14) { theStore.EmailCustomer(customer); customer.LastEmailContact = DateTime.Now; } }); Just like Parallel.For, we rework our loop into a method call accepting a delegate created via a lambda expression. This keeps our new code very similar to our original iteration statement, however, this will now execute in parallel. The same guidelines apply with Parallel.ForEach as with Parallel.For. The other iteration statements, do and while, do not have direct equivalents in the Task Parallel Library. These, however, are very easy to implement using Parallel.ForEach and the yield keyword. Most applications can benefit from implementing some form of Data Parallelism. Iterating through collections and performing “work” is a very common pattern in nearly every application. When the problem can be decomposed by data, we often can parallelize the workload by merely changing foreach statements to Parallel.ForEach method calls, and for loops to Parallel.For method calls. Any time your program operates on a collection, and does a set of work on each item in the collection where that work is not dependent on other information, you very likely have an opportunity to parallelize your routine.

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Flixel - Animated Tilemaps

- by nospoone

I am using Flixel 2.55 and I am trying to animate a tilemap. I found this piece of code that apparently enables the use of sprites as tiles. From what I understand, this loops over the tilemap's graphic and replaces the tile's pixels with the sprite's pixels each time they change. I have implemented the class and it's working, but not completely; the tiles get replaced, but do not animate unless the camera moves. Here's the relevant parts from LevelLoader.as, which only instantiates the AnimatedTilemaps (piece of code from forum) and pushes sprites to the array. // AnimatedTile is just an extended FlxSprite private var _waterTop1:AnimatedTile; // Create ground tilemap _groundTilemap = new AnimatedTilemap(); _groundTilemap.loadMap(_rawXML.Ground, Assets.OverworldGround, 8, 8); FlxG.state.add(_groundTilemap); _waterTop1 = new AnimatedTile(8, 8, Assets.WaterTop, 100); // .Animate only adds and plays an animation, with a startAtFrame param. _waterTop1.Animate('run', [0...47], 10, true, 0); Now, it seems as though the sprites are updating. I tried tracing the update()s, and they are running for both the sprites and the tilemap. The sprites are even changing frames. Using only AnimatedTiles and hard placing them (giving a x and y) works and animates. What troubles me is that they only update when the camera moves. I've been on this for a week now and can't seem to put my finger on what's wrong. I am also open to other solutions to have animates tiles in a tilemap. If other details are needed, just ask. PS: Sorry for my english, I am not a native speaker...

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Sudo and startup script

- by Pitto

Hello my friends. I have a new asus 1215n and I need to digit commands to enable multitouch. No problem: I've made a script. Since this netbook also need manual activation of the wifi driver the complete script is: #!/bin/bash # # list of synaptics device properties http://www.x.org/archive/X11R7.5/doc/man/man4/synaptics.4.html#sect4 # list current synaptics device properties: xinput list-props '"SynPS/2 Synaptics TouchPad"' # sleep 5 #added delay... xinput set-int-prop "SynPS/2 Synaptics TouchPad" "Device Enabled" 8 1 xinput --set-prop --type=int --format=32 "SynPS/2 Synaptics TouchPad" "Synaptics Two-Finger Pressure" 4 xinput --set-prop --type=int --format=32 "SynPS/2 Synaptics TouchPad" "Synaptics Two-Finger Width" 9 # Below width 1 finger touch, above width simulate 2 finger touch. - value=pad-pixels xinput --set-prop --type=int --format=8 "SynPS/2 Synaptics TouchPad" "Synaptics Edge Scrolling" 1 1 0 # vertical, horizontal, corner - values: 0=disable 1=enable xinput --set-prop --type=int --format=32 "SynPS/2 Synaptics TouchPad" "Synaptics Jumpy Cursor Threshold" 250 # stabilize 2 finger actions - value=pad-pixels #xinput --set-prop --type=int --format=8 "SynPS/2 Synaptics TouchPad" "Synaptics Tap Action" 0 0 0 0 1 2 3 # pad corners rt rb lt lb tap fingers 1 2 3 (can't simulate more then 2 tap fingers AFAIK) - values: 0=disable 1=left 2=middle 3=right etc. (in FF 8=back 9=forward) xinput --set-prop --type=int --format=8 "SynPS/2 Synaptics TouchPad" "Synaptics Two-Finger Scrolling" 1 0 # vertical scrolling, horizontal scrolling - values: 0=disable 1=enable #xinput --set-prop --type=int --format=8 "SynPS/2 Synaptics TouchPad" "Synaptics Circular Scrolling" 1 #xinput --set-prop --type=int --format=8 "SynPS/2 Synaptics TouchPad" "Synaptics Circular Scrolling Trigger" 3 sudo modprobe lib80211 sudo insmod /home/pitto/Drivers/broadcom/wl.ko exit I've saved the script, then put it in my home, then chmod +x scriptname and then added it to startup applications. Then I did: sudo visudo and added this row: myusername ALL=(ALL) NOPASSWD: /home/scriptname rebooted and... Multitouch works but wifi not. When I manually launch the script it asks for sudo password so I thought it was because of modprobe and insmod commands and I've added those commands to sudo visudo. Nothing. What am I doing wrong?

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Multitouch script (using xinput) no longer working

- by Pitto

#!/bin/bash # # list of synaptics device properties http://www.x.org/archive/X11R7.5/doc/man/man4/synaptics.4.html#sect4 # list current synaptics device properties: xinput list-props '"SynPS/2 Synaptics TouchPad"' # sleep 5 #added delay... xinput set-int-prop "SynPS/2 Synaptics TouchPad" "Device Enabled" 8 1 xinput --set-prop --type=int --format=32 "SynPS/2 Synaptics TouchPad" "Synaptics Two-Finger Pressure" 4 xinput --set-prop --type=int --format=32 "SynPS/2 Synaptics TouchPad" "Synaptics Two-Finger Width" 9 # Below width 1 finger touch, above width simulate 2 finger touch. - value=pad-pixels xinput --set-prop --type=int --format=8 "SynPS/2 Synaptics TouchPad" "Synaptics Edge Scrolling" 1 1 0 # vertical, horizontal, corner - values: 0=disable 1=enable xinput --set-prop --type=int --format=32 "SynPS/2 Synaptics TouchPad" "Synaptics Jumpy Cursor Threshold" 250 # stabilize 2 finger actions - value=pad-pixels #xinput --set-prop --type=int --format=8 "SynPS/2 Synaptics TouchPad" "Synaptics Tap Action" 0 0 0 0 1 2 3 # pad corners rt rb lt lb tap fingers 1 2 3 (can't simulate more then 2 tap fingers AFAIK) - values: 0=disable 1=left 2=middle 3=right etc. (in FF 8=back 9=forward) xinput --set-prop --type=int --format=8 "SynPS/2 Synaptics TouchPad" "Synaptics Two-Finger Scrolling" 1 0 # vertical scrolling, horizontal scrolling - values: 0=disable 1=enable #xinput --set-prop --type=int --format=8 "SynPS/2 Synaptics TouchPad" "Synaptics Circular Scrolling" 1 #xinput --set-prop --type=int --format=8 "SynPS/2 Synaptics TouchPad" "Synaptics Circular Scrolling Trigger" 3 Hello everybody... The above script allowed me to use happily multitouch for a month... Now if I do a two fingers scrolling the mouse cursor just runs on the screen like possessed... Any hints?

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Vertex buffer acting strange? [on hold]

- by Ryan Capote

I'm having a strange problem, and I don't know what could be causing it. My current code is identical to how I've done this before. I'm trying to render a rectangle using VBO and orthographic projection. My results: What I expect: 3x3 rectangle in the top left corner #include <stdio.h> #include <GL\glew.h> #include <GLFW\glfw3.h> #include "lodepng.h" static const int FALSE = 0; static const int TRUE = 1; static const char* VERT_SHADER = "#version 330\n" "layout(location=0) in vec4 VertexPosition; " "layout(location=1) in vec2 UV;" "uniform mat4 uProjectionMatrix;" /*"out vec2 TexCoords;"*/ "void main(void) {" " gl_Position = uProjectionMatrix*VertexPosition;" /*" TexCoords = UV;"*/ "}"; static const char* FRAG_SHADER = "#version 330\n" /*"uniform sampler2D uDiffuseTexture;" "uniform vec4 uColor;" "in vec2 TexCoords;"*/ "out vec4 FragColor;" "void main(void) {" /* " vec4 texel = texture2D(uDiffuseTexture, TexCoords);" " if(texel.a <= 0) {" " discard;" " }" " FragColor = texel;"*/ " FragColor = vec4(1.f);" "}"; static int g_running; static GLFWwindow *gl_window; static float gl_projectionMatrix[16]; /* Structures */ typedef struct _Vertex { float x, y, z, w; float u, v; } Vertex; typedef struct _Position { float x, y; } Position; typedef struct _Bitmap { unsigned char *pixels; unsigned int width, height; } Bitmap; typedef struct _Texture { GLuint id; unsigned int width, height; } Texture; typedef struct _VertexBuffer { GLuint bufferObj, vertexArray; } VertexBuffer; typedef struct _ShaderProgram { GLuint vertexShader, fragmentShader, program; } ShaderProgram; /* http://en.wikipedia.org/wiki/Orthographic_projection */ void createOrthoProjection(float *projection, float width, float height, float far, float near) { const float left = 0; const float right = width; const float top = 0; const float bottom = height; projection[0] = 2.f / (right - left); projection[1] = 0.f; projection[2] = 0.f; projection[3] = -(right+left) / (right-left); projection[4] = 0.f; projection[5] = 2.f / (top - bottom); projection[6] = 0.f; projection[7] = -(top + bottom) / (top - bottom); projection[8] = 0.f; projection[9] = 0.f; projection[10] = -2.f / (far-near); projection[11] = (far+near)/(far-near); projection[12] = 0.f; projection[13] = 0.f; projection[14] = 0.f; projection[15] = 1.f; } /* Textures */ void loadBitmap(const char *filename, Bitmap *bitmap, int *success) { int error = lodepng_decode32_file(&bitmap->pixels, &bitmap->width, &bitmap->height, filename); if (error != 0) { printf("Failed to load bitmap. "); printf(lodepng_error_text(error)); success = FALSE; return; } } void destroyBitmap(Bitmap *bitmap) { free(bitmap->pixels); } void createTexture(Texture *texture, const Bitmap *bitmap) { texture->id = 0; glGenTextures(1, &texture->id); glBindTexture(GL_TEXTURE_2D, texture); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, bitmap->width, bitmap->height, 0, GL_RGBA, GL_UNSIGNED_BYTE, bitmap->pixels); glBindTexture(GL_TEXTURE_2D, 0); } void destroyTexture(Texture *texture) { glDeleteTextures(1, &texture->id); texture->id = 0; } /* Vertex Buffer */ void createVertexBuffer(VertexBuffer *vertexBuffer, Vertex *vertices) { glGenBuffers(1, &vertexBuffer->bufferObj); glGenVertexArrays(1, &vertexBuffer->vertexArray); glBindVertexArray(vertexBuffer->vertexArray); glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer->bufferObj); glBufferData(GL_ARRAY_BUFFER, sizeof(Vertex) * 6, (const GLvoid*)vertices, GL_STATIC_DRAW); const unsigned int uvOffset = sizeof(float) * 4; glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, sizeof(Vertex), 0); glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (GLvoid*)uvOffset); glEnableVertexAttribArray(0); glEnableVertexAttribArray(1); glBindBuffer(GL_ARRAY_BUFFER, 0); glBindVertexArray(0); } void destroyVertexBuffer(VertexBuffer *vertexBuffer) { glDeleteBuffers(1, &vertexBuffer->bufferObj); glDeleteVertexArrays(1, &vertexBuffer->vertexArray); } void bindVertexBuffer(VertexBuffer *vertexBuffer) { glBindVertexArray(vertexBuffer->vertexArray); glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer->bufferObj); } void drawVertexBufferMode(GLenum mode) { glDrawArrays(mode, 0, 6); } void drawVertexBuffer() { drawVertexBufferMode(GL_TRIANGLES); } void unbindVertexBuffer() { glBindVertexArray(0); glBindBuffer(GL_ARRAY_BUFFER, 0); } /* Shaders */ void compileShader(ShaderProgram *shaderProgram, const char *vertexSrc, const char *fragSrc) { GLenum err; shaderProgram->vertexShader = glCreateShader(GL_VERTEX_SHADER); shaderProgram->fragmentShader = glCreateShader(GL_FRAGMENT_SHADER); if (shaderProgram->vertexShader == 0) { printf("Failed to create vertex shader."); return; } if (shaderProgram->fragmentShader == 0) { printf("Failed to create fragment shader."); return; } glShaderSource(shaderProgram->vertexShader, 1, &vertexSrc, NULL); glCompileShader(shaderProgram->vertexShader); glGetShaderiv(shaderProgram->vertexShader, GL_COMPILE_STATUS, &err); if (err != GL_TRUE) { printf("Failed to compile vertex shader."); return; } glShaderSource(shaderProgram->fragmentShader, 1, &fragSrc, NULL); glCompileShader(shaderProgram->fragmentShader); glGetShaderiv(shaderProgram->fragmentShader, GL_COMPILE_STATUS, &err); if (err != GL_TRUE) { printf("Failed to compile fragment shader."); return; } shaderProgram->program = glCreateProgram(); glAttachShader(shaderProgram->program, shaderProgram->vertexShader); glAttachShader(shaderProgram->program, shaderProgram->fragmentShader); glLinkProgram(shaderProgram->program); glGetProgramiv(shaderProgram->program, GL_LINK_STATUS, &err); if (err != GL_TRUE) { printf("Failed to link shader."); return; } } void destroyShader(ShaderProgram *shaderProgram) { glDetachShader(shaderProgram->program, shaderProgram->vertexShader); glDetachShader(shaderProgram->program, shaderProgram->fragmentShader); glDeleteShader(shaderProgram->vertexShader); glDeleteShader(shaderProgram->fragmentShader); glDeleteProgram(shaderProgram->program); } GLuint getUniformLocation(const char *name, ShaderProgram *program) { GLuint result = 0; result = glGetUniformLocation(program->program, name); return result; } void setUniformMatrix(float *matrix, const char *name, ShaderProgram *program) { GLuint loc = getUniformLocation(name, program); if (loc == -1) { printf("Failed to get uniform location in setUniformMatrix.\n"); return; } glUniformMatrix4fv(loc, 1, GL_FALSE, matrix); } /* General functions */ static int isRunning() { return g_running && !glfwWindowShouldClose(gl_window); } static void initializeGLFW(GLFWwindow **window, int width, int height, int *success) { if (!glfwInit()) { printf("Failed it inialize GLFW."); *success = FALSE; return; } glfwWindowHint(GLFW_RESIZABLE, 0); *window = glfwCreateWindow(width, height, "Alignments", NULL, NULL); if (!*window) { printf("Failed to create window."); glfwTerminate(); *success = FALSE; return; } glfwMakeContextCurrent(*window); GLenum glewErr = glewInit(); if (glewErr != GLEW_OK) { printf("Failed to initialize GLEW."); printf(glewGetErrorString(glewErr)); *success = FALSE; return; } glClearColor(0.f, 0.f, 0.f, 1.f); glViewport(0, 0, width, height); *success = TRUE; } int main(int argc, char **argv) { int err = FALSE; initializeGLFW(&gl_window, 480, 320, &err); glDisable(GL_DEPTH_TEST); if (err == FALSE) { return 1; } createOrthoProjection(gl_projectionMatrix, 480.f, 320.f, 0.f, 1.f); g_running = TRUE; ShaderProgram shader; compileShader(&shader, VERT_SHADER, FRAG_SHADER); glUseProgram(shader.program); setUniformMatrix(&gl_projectionMatrix, "uProjectionMatrix", &shader); Vertex rectangle[6]; VertexBuffer vbo; rectangle[0] = (Vertex){0.f, 0.f, 0.f, 1.f, 0.f, 0.f}; // Top left rectangle[1] = (Vertex){3.f, 0.f, 0.f, 1.f, 1.f, 0.f}; // Top right rectangle[2] = (Vertex){0.f, 3.f, 0.f, 1.f, 0.f, 1.f}; // Bottom left rectangle[3] = (Vertex){3.f, 0.f, 0.f, 1.f, 1.f, 0.f}; // Top left rectangle[4] = (Vertex){0.f, 3.f, 0.f, 1.f, 0.f, 1.f}; // Bottom left rectangle[5] = (Vertex){3.f, 3.f, 0.f, 1.f, 1.f, 1.f}; // Bottom right createVertexBuffer(&vbo, &rectangle); bindVertexBuffer(&vbo); while (isRunning()) { glClear(GL_COLOR_BUFFER_BIT); glfwPollEvents(); drawVertexBuffer(); glfwSwapBuffers(gl_window); } unbindVertexBuffer(&vbo); glUseProgram(0); destroyShader(&shader); destroyVertexBuffer(&vbo); glfwTerminate(); return 0; }

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Convert mkv to mp4 with ffmpeg

- by JohnS

When I try converting mkv to mp4 using ffmpeg, the following error occurs: [ipod @ 0x16fa0a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: -2 = -2 av_interleaved_write_frame(): Invalid argument I used this command to convert the file: ffmpeg -i input.mkv -vcodec copy -acodec copy -absf aac_adtstoasc output.m4v The input file has the following characteristics: mediainfo input.mkv General Unique ID : 200459305952356554213392832683163418790 (0x96CF0ED8DB5914CBB9E18163689280A6) Complete name : input.mkv Format : Matroska Format version : Version 2 File size : 1.46 GiB Duration : 1h 5mn Overall bit rate : 3 168 Kbps Encoded date : UTC 2010-09-26 21:44:02 Writing application : mkvmerge v2.9.5 ('Tu es le seul') built on Jun 17 2009 16:28:30 Writing library : libebml v0.7.8 + libmatroska v0.8.1 Video ID : 1 Format : AVC Format/Info : Advanced Video Codec Format profile : [email protected] Format settings, CABAC : Yes Format settings, ReFrames : 4 frames Codec ID : V_MPEG4/ISO/AVC Duration : 1h 5mn Bit rate : 2 910 Kbps Width : 1 280 pixels Height : 720 pixels Display aspect ratio : 16:9 Frame rate : 25.000 fps Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Progressive Bits/(Pixel*Frame) : 0.126 Stream size : 1.31 GiB (90%) Writing library : x264 core 105 r1724 b02df7b Encoding settings : cabac=1 / ref=3 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=6 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=0 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=0 / chroma_qp_offset=-2 / threads=18 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=0 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc=2pass / mbtree=0 / bitrate=2910 / ratetol=1.0 / qcomp=0.60 / qpmin=10 / qpmax=51 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / ip_ratio=1.40 / pb_ratio=1.30 / aq=1:1.00 Default : Yes Forced : No Audio ID : 2 Format : AC-3 Format/Info : Audio Coding 3 Mode extension : CM (complete main) Codec ID : A_AC3 Duration : 1h 5mn Bit rate mode : Constant Bit rate : 256 Kbps Channel(s) : 2 channels Channel positions : Front: L R Sampling rate : 48.0 KHz Bit depth : 16 bits Compression mode : Lossy Stream size : 121 MiB (8%) Language : English Default : Yes Forced : No Being new to ffmpeg, I'm not sure what the error means or how to correct it. Thanks!

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Textures quality issues with Libgdx

- by user1876708

I have drawn several vector objets and characters ( in Adobe Illustrator ) for my game on Android. They are all scalable at any size without any quality losses ( of course it's vector ^^ ). I have tried to simulate my gameboard directly on Illustrator just before setting my assests on libdgx to implement them in my game. I set all the objects at the good size, so that they fit perfectly on my XHDPI device I am running my test on. As you can see it works great ( for me at least ^^ ), the PNG quality is good for me, as expected ! So I have edited all my PNG at this size, set my assets on libgdx and build my game apk. And here is a screenshot of my gameboard ( don't pay attention at the differences of placing and objects, but check at the objets presents on both screenshot ). As you can see, I have a loss of my PNG quality in the game. It can be seen clealry on the hedgehog PNG, but also ( but not as obvious ) on the mushroom ( check at the outline ) and the hole PNG. If you really pay attention, on every objects, you can see pixels that are not visible on my first screenshot. And I just can't figure out why this is happening Oo If you have any ideas, you are very welcome ! Thanks. PS : You can check more clearly the 2 gameboard on this two links ( look at them at 100%, display at high resolution ) : Good quality link, from Illustrator Poor quality link, from the game Second phase of tests : We display an object ( the hedgehog ) on our main menu screen to see how it looks like. The things is that it looks like he is suppose to, which means, high quality with no pixels. The hedgehog PNG is coming from an atlas : layer.addActor(hedgehog); No loss of quality with this method So we think the problem is comming from the method we are using to display it on our gameboard : blocks[9][3] = new Block(TextureUtils.hedgehog, new Vector2(9, 3)); the block is getting the size from the vector we are associating to it, but we have a loss of quality with this method.

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Styles of games that work at low-resolution

- by Brendan Long

I'm taking a class on compilers, and the goal is to write a compiler for Meggy Jr devices (Arduino). The goal is just to make a simple compilers with loops and variables and stuff. Obviously, that's lame, so the "real goal" is to make an impressive game on the device. The problem is that it only has 64 pixels to work with (technically 72, but the top 8 are single-color and not part of the main display, so they're really only useful for displaying things like money). My problem is thinking of something to do on a device that small. It doesn't really matter if it's original, but it can't be something that's already available. My first idea was "snake", but that comes with the SDK. Same with a side-scrolling shooter. Remaining ideas include a tower defense game (hard to write, hard to control), an RPG (same), tetris (lame).. The problem is that all of the games I like require a high-resolution screen because they have a lot of text. Even a really simple game like nethack would be hard because each creature would be a single color. tl;dr What styles of games require a. No text; and b. Few enough objects that representing them each with a single color is acceptable? EDIT: To clarify, the display is 8x8 for a total of 64 pixels, not 64x64.

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Second monitor not detected

- by configurator

Note: I've seen this question quite a lot, but in all the cases I could find with answers, the answer was either "I don't know" or "use nvidia-settings (which is irrelevant to me)." I'm using Intel Sandybridge Desktop graphics, with a P8H61-M LE motherboard. How do I get Ubuntu to detect my second monitor? Clicking "Detect Displays" here doesn't do anything. Here's some system info: $ lspci | grep VGA 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09) $ uname -a Linux clyde 3.5.0-13-generic #13-Ubuntu SMP Tue Aug 28 08:31:47 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux $ hardinfo [copied from the UI] -Display- Resolution : 1920x1080 pixels Vendor : The X.Org Foundation Version : 1.12.3 -Monitors- Monitor 0 : 1920x1080 pixels -Extensions- BIG-REQUESTS Composite DAMAGE DOUBLE-BUFFER DPMS DRI2 GLX Generic Event Extension MIT-SCREEN-SAVER MIT-SHM RANDR RECORD RENDER SECURITY SGI-GLX SHAPE SYNC X-Resource XC-MISC XFIXES XFree86-DGA XFree86-VidModeExtension XINERAMA XInputExtension XKEYBOARD XTEST XVideo -OpenGL- Vendor : Intel Open Source Technology Center Renderer : Mesa DRI Intel(R) Sandybridge Desktop Version : 3.0 Mesa 8.1-devel Direct Rendering : Yes I've tried upgrading everything from ppa:xorg-edgers/ppa and ppa:glasen/intel-driver. I've also installed various tools I've found in other threads (e.g. hardinfo) but they weren't really helpful to me as I don't know what to make of the data. How do I get Ubuntu to detect my second monitor?

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Creating a retro-style palette swapping effect in OpenGL

- by Zack The Human

I'm working on a Megaman-like game where I need to change the color of certain pixels at runtime. For reference: in Megaman when you change your selected weapon then main character's palette changes to reflect the selected weapon. Not all of the sprite's colors change, only certain ones do. This kind of effect was common and quite easy to do on the NES since the programmer had access to the palette and the logical mapping between pixels and palette indices. On modern hardware, though, this is a bit more challenging because the concept of palettes is not the same. All of my textures are 32-bit and do not use palettes. There are two ways I know of to achieve the effect I want, but I'm curious if there are better ways to achieve this effect easily. The two options I know of are: Use a shader and write some GLSL to perform the "palette swapping" behavior. If shaders are not available (say, because the graphics card doesn't support them) then it is possible to clone the "original" textures and generate different versions with the color changes pre-applied. Ideally I would like to use a shader since it seems straightforward and requires little additional work opposed to the duplicated-texture method. I worry that duplicating textures just to change a color in them is wasting VRAM -- should I not worry about that?

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Fixed timestep with interpolation in AS3

- by Jim Sreven

I'm trying to implement Glenn Fiedler's popular fixed timestep system as documented here: http://gafferongames.com/game-physics/fix-your-timestep/ In Flash. I'm fairly sure that I've got it set up correctly, along with state interpolation. The result is that if my character is supposed to move at 6 pixels per frame, 35 frames per second = 210 pixels a second, it does exactly that, even if the framerate climbs or falls. The problem is it looks awful. The movement is very stuttery and just doesn't look good. I find that the amount of time in between ENTER_FRAME events, which I'm adding on to my accumulator, averages out to 28.5ms (1000/35) just as it should, but individual frame times vary wildly, sometimes an ENTER_FRAME event will come 16ms after the last, sometimes 42ms. This means that at each graphical redraw the character graphic moves by a different amount, because a different amount of time has passed since the last draw. In theory it should look smooth, but it doesn't at all. In contrast, if I just use the ultra simple system of moving the character 6px every frame, it looks completely smooth, even with these large variances in frame times. How can this be possible? I'm using getTimer() to measure these time differences, are they even reliable?

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Optimal sprite size for rotations

- by Panda Pajama

I am making a sprite based game, and I have a bunch of images that I get in a ridiculously large resolution and I scale them to the desired sprite size (for example 64x64 pixels) before converting them to a game resource, so when draw my sprite inside the game, I don't have to scale it. However, if I rotate this small sprite inside the game (engine agnostically), some destination pixels will get interpolated, and the sprite will look smudged. This is of course dependent on the rotation angle as well as the interpolation algorithm, but regardless, there is not enough data to correctly sample a specific destination pixel. So there are two solutions I can think of. The first is to use the original huge image, rotate it to the desired angles, and then downscale all the reaulting variations, and put them in an atlas, which has the advantage of being quite simple to implement, but naively consumes twice as much sprite space for each rotation (each rotation must be inscribed in a circle whose diameter is the diagonal of the original sprite's rectangle, whose area is twice of that original rectangle, supposing square sprites). It also has the disadvantage of only having a predefined set of rotations available, which may be okay or not depending on the game. So the other choice would be to store a larger image, and rotate and downscale while rendering, which leads to my question. What is the optimal size for this sprite? Optimal meaning that a larger image will have no effect in the resulting image. This is definitely dependent on the image size, the amount of desired rotations without data loss down to 1/256, which is the minimum representable color difference. I am looking for a theoretical general answer to this problem, because trying a bunch of sizes may be okay, but is far from optimal.

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9 Gigapixel Photo Captures 84 Million Stars

- by Jason Fitzpatrick

The European Southern Observatory has released an absolutely enormous picture of the center of the Milky Way captured by their VISTA telescope–the image is 9 gigapixels and captures over 84 million stars. From the press release: The large mirror, wide field of view and very sensitive infrared detectors of ESO’s 4.1-metre Visible and Infrared Survey Telescope for Astronomy (VISTA) make it by far the best tool for this job. The team of astronomers is using data from the VISTA Variables in the Via Lactea programme (VVV), one of six public surveys carried out with VISTA. The data have been used to create a monumental 108 200 by 81 500 pixel colour image containing nearly nine billion pixels. This is one of the biggest astronomical images ever produced. The team has now used these data to compile the largest catalogue of the central concentration of stars in the Milky Way ever created. Want to check out all 9 billion glorious pixels in their uncompressed state? Be prepared to wait a bit, the uncompressed image is available for download but it weighs in at a massive 24.6GB. 84 Million Stars and Counting [via Wired] How Hackers Can Disguise Malicious Programs With Fake File Extensions Can Dust Actually Damage My Computer? What To Do If You Get a Virus on Your Computer

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Frame Independent Movement

- by ShrimpCrackers

I've read two other threads here on movement: Time based movement Vs Frame rate based movement?, and Fixed time step vs Variable time step but I think I'm lacking a basic understanding of frame independent movement because I don't understand what either of those threads are talking about. I'm following along with lazyfoo's SDL tutorials and came upon the frame independent lesson. http://lazyfoo.net/SDL_tutorials/lesson32/index.php I'm not sure what the movement part of the code is trying to say but I think it's this (please correct me if I'm wrong): In order to have frame independent movement, we need to find out how far an object (ex. sprite) moves within a certain time frame, for example 1 second. If the dot moves at 200 pixels per second, then I need to calculate how much it moves within that second by multiplying 200 pps by 1/1000 of a second. Is that right? The lesson says: "velocity in pixels per second * time since last frame in seconds. So if the program runs at 200 frames per second: 200 pps * 1/200 seconds = 1 pixel" But...I thought we were multiplying 200 pps by 1/1000th of a second. What is this business with frames per second? I'd appreciate if someone could give me a little bit more detailed explanation as to how frame independent movement works. Thank you.

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Sampling Heightmap Edges for Normal map

- by pl12

I use a Sobel filter to generate normal maps from procedural height maps. The heightmaps are 258x258 pixels. I scale my texture coordinates like so: texCoord = (texCoord * (256/258)) + (1/258) Yet even with this I am left with the following problem: As you can see the edges of the normal map still proves to be problematic. Putting the texture wrap mode to "clamp" also proved no help. EDIT: The Sobel Filter function by sampling the 8 surrounding pixels around a given pixel so that a derivative can be calculated in order to find the "normal" of the given pixel. The texture coordinates are instanced once per quad (for the quadtree that makes up the world) and are created as follows (it is quite possible that the problem results from the way I scale and offset the texCoords as seen above): Java: for(int i = 0; i<vertices.length; i++){ Vector2f coord = new Vector2f((vertices[i].x)/(worldSize), (vertices[i].z)/( worldSize)); texCoords[i] = coord; } the quad used for input here rests on the X0Z plane. 'worldSize' is the diameter of the planet. No negative texCoords are seen as the quad used for input for this method is not centered around the origin. Is there something I am missing here? Thanks.

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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 stencil buffer with a specific value. For example I draw my scene and want to mark everything which is drawn with a specific material (this material could be looked up from a texture so ideally I should mark the pixel in the pixel shader), so that later when I do some post processing on my scene I would only do it on the marked pixels. I didn't find anything on the internet besides how to set up a stencil buffer and explaining the different stencil operations. I was expecting to find some System-Value semantics like SV_Depth to write to in the pixel shader (because the stencil buffer shares the same resource with the depth buffer in D3D11), but there is no such thing on MSDN. So how should I do this? If I am misunderstanding something please help me clear that up.

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How to store bitmaps in memory?

- by Geotarget

I'm working with general purpose image rendering, and high-performance image processing, and so I need to know how to store bitmaps in-memory. (24bpp/32bpp, compressed/raw, etc) I'm not working with 3D graphics or DirectX / OpenGL rendering and so I don't need to use graphics card compatible bitmap formats. My questions: What is the "usual" or "normal" way to store bitmaps in memory? (in C++ engines/projects?) How to store bitmaps for high-performance algorithms, such that read/write times are the fastest? (fixed array? with/without padding? 24-bpp or 32-bpp?) How to store bitmaps for applications handling a lot of bitmap data, to minimize memory usage? (JPEG? or a faster [de]compression algorithm?) Some possible methods: Use a fixed packed 24-bpp or 32-bpp int[] array and simply access pixels using pointer access, all pixels are allocated in one continuous memory chunk (could be 1-10 MB) Use a form of "sparse" data storage so each line of the bitmap is allocated separately, reusing more memory and requiring smaller contiguous memory segments Store bitmaps in its compressed form (PNG, JPG, GIF, etc) and unpack only when its needed, reducing the amount of memory used. Delete the unpacked data if its not used for 10 secs.

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Understanding IDAT chunk of PNG file format

- by DRapp

From the sample image below, I have a border in yellow just for display purposes only. The actual .png file is a simple black/white image 3 pixels by 3 pixels. I was originally thinking to try as a 2x2, but that would not help trying to interpret low/hi vs hi/low drawing stream. At least this way, I would have two black, one white from the top, or one white, two black from the bottom.. So I read the chunks of data, get to the IDAT chunk, decode that (zlib) and come up with 12 bytes as follows 00 20 00 40 00 80 So, my question, how does the above get broken down into the 3x3 black and white sample... Also, it is saved in palette format and properly recognizes the bit depth of 1 and color palette of 2... color pallet[0] is RGBA all zeros. Palette1 has RGBA of 255, 255, 255, 0 I'll eventually get into the multiple other depth formats later, just wanted to start with what would expect to be the easiest. Part II. Any guidance on handling the other depth formats would help if anything special to be considered especially regarding alpha channel (which I am already looking for in the palette) that might trip me up.

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Problem with alleg42.dll / program crashes / Allegro & Codeblocks

- by user24152

I'm having a serious problem with allegro. The program should display random pixels on the screen and when I build and run it I get the following error message: Below is the full code of my program: #include <stdio.h> #include <stdlib.h> #include <time.h> #include "allegro.h" #define Text_Color_Red makecol(255,0,0) int main() { int ret; int color_depth = 32; int x; int y; int red; int green; int blue; int color; //init allegro allegro_init(); //install keyboard install_keyboard(); //set color depth to 32 bits set_color_depth(color_depth); //init random seed srand(time(NULL)); //init video mode to 640 x 480 ret = set_gfx_mode(GFX_AUTODETECT_WINDOWED,640,480,0,0); if(ret !=0) { allegro_message(allegro_error); return 1; } //Display string textprintf(screen,font,0,0,10,0,Text_Color_Red,"Screen Resolution is: %dx%d -- Press ESC to quit !",SCREEN_W,SCREEN_H); //display pixels until ESC key is pressed //wait for keypress while(!key[KEY_ESC]) { //set a random location x = 10 + rand() % (SCREEN_W-20); y = 10 + rand() % (SCREEN_H-20); //set a random color red = rand() % 255; green = rand() % 255; blue = rand() % 255; color = makecol(red,green,blue); //draw the pixel putpixel(screen, x, y, color); } //quit allegro allegro_exit(); } END_OF_MAIN() Error message: AllegroPixels1.exe has encountered a problem and needs to close. We are sorry for the inconvenience. Error signature: AppName: allegropixels1.exe AppVer: 0.0.0.0 ModName: alleg42.dll ModVer: 4.2.3.0 Offset: 0006c05c I am using Windows XP inside a virtual machine under Parallels 7.0

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