Questions tagged [graphics-programming]
Programming related to the visual representation of information on computer screens.
363
questions
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28 views
How to position/transform vertices for 2D UI in shaders?
I am building a 3D engine and have a rendering abstraction that focuses on writing shaders. Most my 3D shaders have gl_Position output like:
...
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1answer
35 views
Multiple directional lights use cases?
I have been building and designing a hobby-tier game engine and I am currently working on supporting any amount of lights of any type. I checked out Unity and it supports multiple directional lights, ...
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1answer
43 views
OpenGL Rendering Pipeline
I've been learning OpenGL graphics programming and I've decided I'd quite like to make a simple game using OpenGL.
Drawing something in OpenGL, needless to say, is quite the endeavour. However it ...
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1answer
43 views
Pseudocode for calculating per vertex normals for a trianglestrip mesh
I have a terrain that is defined as a trianglestrip mesh. Now I'm trying to calculate the normals of each vertex but I've realised that my normal way of calculating vertex normals only works with ...
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0answers
14 views
PBR specular highlight artifact
I am trying to implement pbr and it seems I have an artifact at the specular highlight
This is basically the code
...
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0answers
30 views
What information should be included in a render command?
I'm writing a 3D renderer for my engine and now that I'm working properly with a scenenode system, I've decided to implement render queues (command lists to some) and render commands. I wanted to know,...
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1answer
38 views
SDL window crashes when mouse goes below a certain point
I added code to check the rgb values of my surface, and whenever i call the function it seems to work fine! the only problem is that whenever the mouse goes under y = 400 the entire window crashes... ...
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38 views
OBB Frustrum Culling in Clip Space
I've been trying for a while to implement a frustum culling method using a per-computed AABB in object space and transforming it's corners into clip space.
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3
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0answers
106 views
Object Transparency Dithering (as shown in Super Mario Odyssey)
A couple games I've been playing recently all have a similar goal of dithering objects when they approach the near clip plane. Super Mario Odyssey applies this dithering-near-clip-plane effect, but ...
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23 views
Gamma adjustment slider implementation
Various online sources talk in sufficient detail about gamma correction. By following them, I achieved a rendering pipeline that looks somewhat like this:
...
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0answers
42 views
What are the options when float textures aren't precise enough?
I am currently experimenting with rendering planetary scale terrain.
I am generating the terrain on the GPU with noise, and to fix the 32 bit floating point precision problems, I generate the ...
0
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1answer
51 views
OpenGL approach to depth-testing-like combination of a large buffer of fragments
I have a depth buffer and color buffer created by another effect. The buffer is more than double my screen size. It is not rendered from geometry, but as a whole it resembles a rendered scene with an ...
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25 views
Sprite alignment in my sprite packer
I am creating the "perfect" sprite packer. This is a sprite packer that makes sure the output sprite is fully compatible with everything.
It converts (if needed) the source frames to BMP in memory
It ...
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63 views
RayCasting with Mode7
I'm trying to join the mode7 algorithm with RayCasting. For mode7, I'm using a simple rotation matrix to implement the rotation. The result is a little strange and I can't fix it. Do you know what is ...
0
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1answer
91 views
Can I linear interpolate color along both the X and Y axis of a circle instead of using the distance formula on each individual point?
I've been unable to make it work and I'm not sure whether it's a problem with my code or if this can even be done. I'm sure there is a way to prove whether it is possible mathematically but I don't ...
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3answers
163 views
How to draw a smoother solid-fill circle?
I'm experimenting with drawing circles and have brute-forced a very simple one:
Pseduocode:
...
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2answers
57 views
Can a character interact well with surroundings in-game?
I don't have any experience in game programming, but I am currently on programming-related degree, although on a different branch to game design.
I thought about how an environment can come more ...
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0answers
41 views
How to divide commands to CommandLists in DirectX12/Vulkan?
Currently my DirectX graphics engine submits all draw commands in a single, large CommandList. I want to paralellize my CommandList recording to improve performance on CPU side, but I'd have to ...
2
votes
1answer
118 views
Additive Blending and Gamma Correction
Should one do additive blending (aka lightmapping) in linear space?
I tried doing it in linear space, and it became, well, linear and bland, losing that cool HDR-style bloomy effect. Is there some ...
0
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1answer
119 views
Mapping a Texture to a 2d Quadrilateral
I want to map a 2d picture onto an arbitrary 2d quadrilateral, for the purpose of particle system. To do that, I split the picture into two triangles, and then linearly interpolated u,v along the ...
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1answer
113 views
Alpha Blending in Software with Gamma Correction
How does one efficiently implement alpha blending, without botching gamma?
Alpha blending is basically the following expression:
...
-1
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1answer
235 views
Fastest Software Gamma=2.2 for RGB?
With gamma=2.0 you can use that Carmack's inverse sqrt hack or a lookup table. Yet all standard graphic formats mandate the use of gamma=2.2, and SVGA framebuffer also requires it. Unfortunately, for ...
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2answers
49 views
How can I create a .ico file with all the various resolution sizes within one container?
I was looking at this GOG.ico in ffmeg, and was surprised to see all the streams for it...indicating it was holding multiple images in the .ico container or .ico has some kind of self-creation ...
2
votes
2answers
81 views
Midpoint displacement generating unsatisfactory terrain
Following this lesson for implementing mid-point displacement algorithm for terrain generation. I aim at generating a wavefront(obj) file of the terrain
I have an array of dimension (2^n + 1) x (2^n +...
40
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3answers
6k views
How can bays and straits be determined in a procedurally generated map?
I've got a procedurally generated map using Voronoi cells, with a defined sea level and a believable height map.
So far, I've been successful in labelling certain geographic features: land, ocean, ...
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3answers
135 views
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2answers
147 views
d3d11 renderqueue multi pass rendering design best practice
The goal: issue least calls to d3d11 ImmediateContext and render advanced effects like toon / outline / anything that requires rendering the same vertex buffers with at least two different vertex ...
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1answer
178 views
When does it make sense to use Index Buffers?
The concept of Index buffers is that certain vertices are shared across faces, hence can be reused to save space of duplicated verticies. A vertex is usually more than 12 bytes (depending on the ...
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vote
1answer
122 views
How to Render two or more images on video frame in same draw call using metal
I'm new bee to graphics programming and i have an existing code base which basically takes frame from video and passes it to metal shader where effects (like colour changes) happens.
Whats currently ...
0
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1answer
487 views
Is Frustum Culling and Occlusion Culling used together, or separately?
I am taking a 3D game programming course and my professor provided the class with already-implemented graphics code with OpenGL. The graphics uses frustum culling to remove primitives outside the view ...
0
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1answer
105 views
How can I seamlessly animate textures across tiles like in Civilization 6?
I am trying to make a much simpler version of the graphic effects we see in the game Civilization 6. This question applies to the graphics on land and ocean tiles. But I first noticed this effect on ...
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2answers
120 views
How to develop custom Unity graphics?
Processing is a Java library for working with computer graphics, providing methods by which to draw primitive objects, custom meshes, etc., as well as mathematical methods (such as Simple Harmonic ...
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1answer
243 views
Polygons depth sorting in Z-buffer
Why is it that the Z-buffer algorithm does not require polygons to be depth sorted to function correctly?
23
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3answers
5k views
How do I know if I'm abstracting graphics APIs too tightly?
When making a renderer that supports multiple graphics APIs, you would typically want to abstract your code in some sort of low level library that is tied with some graphics API like OpenGL, Vulkan, ...
0
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1answer
214 views
How to create a decent strategy game without becoming an artist?
I love to make games. But I am not an artist. I never learned to make 2d or 3d models. I spent most of my time on programming. I know there are Game engines for non-programmers. But I am looking a way ...
1
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1answer
806 views
Rendering clouds similar to Sky: Light Awaits?
I'm interested in adding clouds to my game, with a style similar to those in Sky: Light Awaits
You can see them in motion in these videos:
(Starts at 26:00)
https://www.youtube.com/watch?v=...
0
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1answer
183 views
Directx 12 Root signature compatibility with pso
Can you bind a different root signature than the one that pipeline was created with? If so does it have to have exactly the same parameters or could it have like one more but the pipeline will ignore ...
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0answers
217 views
how to calculate smooth normals for 10,000,000 vertices?
I am trying to calculate smooth normals with angle weight for a huge mesh with 10 million vertices. Currently, i am using map/dictionary to store the traingles connected to a vertex. That is, for each ...
1
vote
1answer
183 views
Why do GPUs have limited amount of allocations?
I've been learning Vulkan lately and I read that you can allocate VRAM memory only set amount of times and it doesn't matter if it's 2gb or 2kb, why is it?
I'm specifically referring to ...
3
votes
1answer
159 views
Render moveable entities into 3D isometric world?
I have a separate list of moveable entities, and then the regular 3D map, represented by a 2D array of stacks of tiles. My problem is that right now, I'm rendering my moveable entities after the map, ...
2
votes
1answer
1k views
Strange realtime shadows in Unity3D
I'm trying to do realtime lighting, and my shadows are acting very strange. When I project a spotlight out from the camera (like a flashlight in a first person game) my shadows show up as 3D skews of ...
22
votes
1answer
3k views
Why do transformation matrices always have an extra dimension? [duplicate]
In 3D math I always see matrices with one additional dimension. For example, in 3D graphics, matrices are always 4x4 and in 2d they are 3x3 matrices. Can anyone explain why?
5
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2answers
437 views
Ordered dithering between “discrete” colors?
I want to achieve color dithering between discrete colors like this:
As you can see, there is no gradient, or technically there is, but very discrete as it's only a 3 color image (right bar).
So I ...
1
vote
1answer
283 views
Does it make sense to do more calculations in the fragment shader if there are more vertices than pixels?
I'm very new to graphics programming, and as I understand it vertex shaders are called per vertex and fragment shaders are per pixel (ignoring anti-aliasing). When it comes to optimization all sources ...
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0answers
111 views
How does one create ENB for games like: San Andreas
I know this particular community could be wrong for such a question that includes programmers, modders and such. I believe I should be asking such question on stackoverflow.com or something similar, ...
1
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1answer
63 views
Does GL Memory model guarantees that late Depth Testing accesses depth buffer values in same draw call
Suppose I issue a draw command that draws 3 overlapping triangles (T1, T2, T3). Fragment shader assigns Depth = 3 to T1 fragments, 2 to T2 and 1 to T3 fragments. Depth Buffer is cleared to 0 before ...
3
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0answers
697 views
ray-casting, floor-casting part fails
I'm currently working on a ray-casting engine in Java and I can't figure out what's wrong with my code.
For the learning and theory I use:
The permadi tutorial: ( https://permadi.com/1996/05/ray-...
0
votes
1answer
146 views
OpenGL: How to render a “shadow” for an object that's behind another?
First off, an image from Fez that depicts the effect I'm after:
I'm trying to achieve a similar effect in my project. I'm quite certain this is done with a stencil buffer, but the resources on such ...
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0answers
24 views
How can I load a file in memory on the Apple IIGS?
I recently got an Apple IIGS and have it booting GS/OS off of a compact flash with 10 32MB ProDOS volumes. It's a great little setup and I've installed ORCA/M, 816 Paint, Merlin 16+ and Complete ...
5
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1answer
747 views
How can I dynamically switch between graphics APIs?
In games like the new "Doom", you have a console, from which you can use commands to reduce the game's quality or even to switch graphics API, from Opengl to Vulkan and viceversa.
How is this done? I ...
