r2 | Aggressively minimalist deferred renderer | Graphics library

 by   io7m Java Version: Current License: ISC

kandi X-RAY | r2 Summary

kandi X-RAY | r2 Summary

r2 is a Java library typically used in User Interface, Graphics applications. r2 has no bugs, it has no vulnerabilities, it has build file available, it has a Permissive License and it has low support. You can download it from GitHub, Maven.

[Codacy Badge] Aggressively minimalist deferred renderer. See for more information.
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              r2 has a low active ecosystem.
              It has 3 star(s) with 1 fork(s). There are 2 watchers for this library.
              OutlinedDot
              It had no major release in the last 6 months.
              There are 5 open issues and 94 have been closed. On average issues are closed in 62 days. There are no pull requests.
              It has a neutral sentiment in the developer community.
              The latest version of r2 is current.

            kandi-Quality Quality

              r2 has no bugs reported.

            kandi-Security Security

              r2 has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

            kandi-License License

              r2 is licensed under the ISC License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              r2 releases are not available. You will need to build from source code and install.
              Deployable package is available in Maven.
              Build file is available. You can build the component from source.

            Top functions reviewed by kandi - BETA

            kandi has reviewed r2 and discovered the below as its top functions. This is intended to give you an instant insight into r2 implemented functionality, and help decide if they suit your requirements.
            • Generate the tangents of a mesh .
            • Initializes the builder .
            • Allocates a unit quad .
            • Sets the list of segments .
            • Creates a new light buffer .
            • Parse a mesh .
            • Render base .
            • Run the blur .
            • Runs blur filter .
            • On render method .
            Get all kandi verified functions for this library.

            r2 Key Features

            No Key Features are available at this moment for r2.

            r2 Examples and Code Snippets

            No Code Snippets are available at this moment for r2.

            Community Discussions

            QUESTION

            Advice on improving a function's performace
            Asked 2022-Apr-11 at 00:08

            For a project I'm working on, I require a function which copies the contents of a rectangular image into another via its pixel buffers. The function needs to account for edge collisions on the destination image as the two images are rarely going to be the same size.

            I'm looking for tips on the most optimal way to do this, as the function I'm using can copy a 720x480 image into a 1920x955 image in just under 1.5ms. That's fine on its own, but hardly optimal.

            ...

            ANSWER

            Answered 2022-Apr-10 at 19:29

            You can determine once for all which rectangle of the source image will effectively be copied to the destination. Then the most efficient way is to copy row by row, as the rows are contiguous. And memcpy is the fastest way.

            Source https://stackoverflow.com/questions/71816358

            QUESTION

            SSBO CPU mapping returning correct data, but data is 'different' to the SSBO on GPU
            Asked 2022-Feb-10 at 13:25

            I've run into an issue while attempting to use SSBOs as follows:

            ...

            ANSWER

            Answered 2022-Feb-10 at 13:25

            GLSL structs and C++ structs have different rules on alignment. For structs, the spec states:

            If the member is a structure, the base alignment of the structure is N, where N is the largest base alignment value of any of its members, and rounded up to the base alignment of a vec4. The individual members of this substructure are then assigned offsets by applying this set of rules recursively, where the base offset of the first member of the sub-structure is equal to the aligned offset of the structure. The structure may have padding at the end; the base offset of the member following the sub-structure is rounded up to the next multiple of the base alignment of the structure.

            Let's analyze the struct:

            Source https://stackoverflow.com/questions/71065244

            QUESTION

            What is the best lossless way to scale up a barcode image in c#
            Asked 2022-Feb-09 at 21:20

            I've come across this problem many times over the years and still live in hope that there is an easy way to do this that I have missed. I work with barcodes a lot. They are usually made of black dots or lines on a white background. Barcode readers generally work faster and more accurately when the edges are crisp and then size of the lines or dots are precise.

            Most barcode generation algorithms will give you a compact barcode usually with the smallest element size being one pixel. A typical QR code could fit in a 21 x 21 grid. This would be too small to see if printed pixel to pixel on most printers and would typically be scaled up. The result of scaling it up depends on the method used and although sometimes you are given a choice, often you have no options that make the image suitable. Even printing directly will often give you expected gray artefacts or forms of dithering. The most consistent way I have found is to scale the images before they are use daily in other places such as Microsoft Word, lightburn and a few others I use that still give me a headache.

            Below I will go through what I have tried and show the results. I am limiting this to bitmaps only because using vectors here is not something I need on my current project.

            My current best resolution is not pretty, it is slow and although I could improve the speed by locking the bits in the bitmap, I am hoping someone has a really simple answer that I had totally missed on my search again this time.

            Here is an image of a simple QR code blown up in GIMP.

            The problem is, if it is scaled up, it'll often end up looking like this:

            Below I created a small test program to go through all the different modes I know of and then generate a matrix of images which I have reproduced below. The version I currently use is Mode 99 which involves inspecting each pixel and drawing a square.

            Does anyone have any better ideas?

            ...

            ANSWER

            Answered 2022-Feb-09 at 19:27

            You can use a library like ImageTracer.NET to convert the image to a vector image, then it'll scale as big as you need:

            https://github.com/MiYanni/ImageTracer.NET

            Source https://stackoverflow.com/questions/71055395

            QUESTION

            Motion Vector - how to calculate it properly?
            Asked 2022-Jan-20 at 21:07

            I'm trying to wrap my head around calculating motion vectors (also called velocity buffer). I found this tutorial, but I'm not satisfied with explanations of how motion vector are calculated. Here is the code:

            ...

            ANSWER

            Answered 2022-Jan-20 at 21:07

            This is a mapping from the [-1, 1] clip space onto the [0, 1] texture space. Since lookups in the blur shader have to read from a textured at a position offset by the velocity vector, it's necessary to perform this conversion.

            Note, that the + 0.5 part is actually unnecessary, since it cancels out in a-b anyway. So the same result would have been achieved by using something like

            Source https://stackoverflow.com/questions/70792949

            QUESTION

            Using the CGA/EGA/VGA planar graphics modes
            Asked 2022-Jan-17 at 01:56

            I have trouble to grasp how to use colors in CGA/EGA/VGA video graphics modes. The video modes I'm particularly interested in are 0Dh (EGA 320x200) and 12h (VGA 640x480). Both of these modes have 4 planes, thus 16 colors.

            My (probably incorrect) understanding is that I should activate a set of planes by writing a bitmask to port 03C4h, then when I write to video memory, the data only gets written to the activated planes. Mostly I used this document to get my information, though I also encountered several other tutorials and discussions: http://www.techhelpmanual.com/89-video_memory_layouts.html

            Now I'm trying to write pixels in all possible colors in the first word in the video memory (top left part of screen). I load 1 for the initial bitmask to AH and 1 bit to BX. Then in a loop, I increment AH and shift (SHL) the bit in BX to hit a different pixel next time. I OR BX to A000h:0000h to add each pixels by leaving the already existing pixels untouched.

            What I'm expected to see is a line of pixels in all possible 16 EGA colors on the top left of the screen. What I actually see is 7 white and 1 bright yellow dots with black pixels in between them. What am I doing wrong?

            Also, every tutorial says that I must write 0005h to port 03CEh before I start to use planes. What is the purpose of that? When I comment those lines out, I can still use planes (I mean, in other programs). Previously I had success using planes when I was writing to different words in video memory (so I didn't need different color pixels in one block of 16 pixels that's represented by a single word in video memory); and when I used BIOS functions (e.g. INT 10h/AH=0Ch) to write pixels, but still I want to understand how to use planar graphics without BIOS, as I believe the BIOS functions are slow.

            Here is my code (indentation is optimized for 8-width tabs, so it kind of looks off here):

            ...

            ANSWER

            Answered 2022-Jan-17 at 01:56

            Writing the word 0005h to ports 03CEh and 03CFh will select write mode 0. This is a complex mode that involves many features of the VGA but luckily for us most of these are reset when the video mode is set.
            However your code still needs to do the following:

            • In order to fill the VGA's internal 32-bit latch, you must perform a read-before-write operation
            • Restricting output to a single or a few pixels is done using the BitMask register.

            Next snippet displays a rainbow of 16 vertical lines that are 1 pixel wide:

            Source https://stackoverflow.com/questions/70729643

            QUESTION

            VBE: why does my code not provide a linear frame buffer?
            Asked 2022-Jan-15 at 21:24

            I am a beginner who is trying to implement simple graphics in VBE. I have written the following assembly code to boot, enter 32-bit protected mode, and enter VBE mode 0x4117. (I was told that the output of [mode] OR 0x4000 would produce a version of the mode with a linear frame buffer, so I assumed that 0x0117 OR 0x4000 = 0x4117 should have a linear frame buffer.

            ...

            ANSWER

            Answered 2022-Jan-15 at 21:24

            Have I correctly loaded a linear frame buffer, and, if not, how could I do so?

            In your code you just assume that the linear frame buffer mode is available. You should inspect the ModeInfoBlock.ModeAttributes bit 7 to know for sure. The bit needs to be ON:

            Source https://stackoverflow.com/questions/70704920

            QUESTION

            Add border to rasterImage
            Asked 2022-Jan-02 at 14:46

            Here is a gradient color legend I created using rasterImage:

            ...

            ANSWER

            Answered 2022-Jan-02 at 11:54

            Using rect(), the following adds a black border.

            Source https://stackoverflow.com/questions/70555635

            QUESTION

            Plot two 3D graphics from own models in one plot in R
            Asked 2021-Dec-15 at 10:57

            I have a model like this

            ...

            ANSWER

            Answered 2021-Dec-15 at 10:57

            All commands from the plot3D package include a command add = T. With that it is very easy to plot the second surface, by just adding add = T to the second plot command.

            Source https://stackoverflow.com/questions/70242727

            QUESTION

            Draw a String with a specific angle degree in line
            Asked 2021-Dec-03 at 21:58

            I'm drawing a graph with two points of each point having a line with a weight.

            for example graph: point "15" to point "16" line with the weight of 1.872 and point "16" to point "15" with the weight of 1.567.

            take a look at my graph for now:

            I want to draw a String with always parallel (adjacent) to the line.

            I calculated the slope for the straight and the angel I did calculate is the arctan of this slope:

            I had use this function to rotate the string:

            ...

            ANSWER

            Answered 2021-Dec-03 at 21:58

            Here is a quick demo to be used as a guide on how it might be done. I omitted some things like the arrowheads since that is just busy work. And I guesstimated on the label positions. I would recommend you read about the three argument version of Graphics.rotate() and RenderingHints and anti-aliasing to smooth the lines.

            You may want to write general methods to facilitate positioning the text and labels based on font size.

            But I believe your primary problem was doing int division when calculating the slope.

            Source https://stackoverflow.com/questions/70219594

            QUESTION

            SkiaSharp draw to window
            Asked 2021-Nov-27 at 09:50

            How can I open a window and draw to it with SkiaSharp (without using winforms, wpf or anything like that)? I've tried using SFML.Net instead of SKIA but it lacks a lot of features (rounded rectangle, shadow, gradient).

            ...

            ANSWER

            Answered 2021-Nov-27 at 09:50

            I have solved the problem by using Silk.NET SFML bindings to create a GL context for Skia.

            This pull request was very helpful.

            Source https://stackoverflow.com/questions/70085658

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

            Vulnerabilities

            No vulnerabilities reported

            Install r2

            You can download it from GitHub, Maven.
            You can use r2 like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the r2 component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .

            Support

            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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