Questions tagged [graphics-programming]
Programming related to the visual representation of information on computer screens.
375
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29 views
What does glBlendFunc(GL_DST_COLOR, GL_ZERO); mean?
I need to write a description about a filter method I made but I don't know what glBlendFunc(GL_DST_COLOR, GL_ZERO); means.
-1
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1answer
51 views
Why are vertices coordinates are always between -1 and 1 in 3D Models
I'm writing my very first 3D rendering engine in C++ using SDL2, and I've been following this book that has multiple code examples that has 3D models with vertices that all have coordinates between -1 ...
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2answers
64 views
Generate vertices of a sphere by using spherical coordinates
I'm trying to generate points for a sphere by subdividing the space of spherical coordinate in res sector and res slices.
At first I did my own implementation, but it wasn't working. After a while I ...
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0answers
94 views
Supporting multiple graphics apis
I would like to provide support for switching between both OpenGL and Vulkan in my game (and potentially DX12 later). Currently I only know OpenGL so I am working on that.
I have read a lot of posts ...
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1answer
30 views
Unity: Alpha and color issues with opaque projector/decal shader
I have been attempting to make a simple "overwrite" version of Unity's projector shader. I can either respect the color, or respect the transparency, but not both.
I have simplified the ...
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1answer
47 views
Get black bars with framebuffer and glViewport
I have read several tutorials and answers regarding framebuffers and glViewport, but I can't seem to resolve this issue I have. I want to take a low resolution framebuffer (400x225) and place it in a ...
0
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1answer
89 views
Opengl in 500 lines barycentric calculation question
https://github.com/ssloy/tinyrenderer/wiki/Lesson-2-Triangle-rasterization-and-back-face-culling
I cannot figure out how we go from uAB-vector + vAC-vector + PA-vector = 0 to the linear system with ...
1
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1answer
80 views
Opengl in 500 lines point in triangle question
https://github.com/ssloy/tinyrenderer/wiki/Lesson-2-Triangle-rasterization-and-back-face-culling
I am on lesson 2 of the "Opengl in 500 lines" tutorial. I ...
0
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1answer
63 views
Difference between shader input element classification between D3D12 and Vulkan
I'm confused about the difference between the shader input element classifications in D3D12 and Vulkan. For example, in Vulkan I could have the following declarations:
...
1
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1answer
89 views
OpenGL: What to do after running glBufferData?
I am interested in understanding a bit more behind how OpenGL does its memory management and what are some good practices before I start heavily coding and back myself into a corner.
The real question ...
0
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0answers
50 views
Deferred shading - g-buffer positions, world or view space?
So, i am doing this for the first time. I have a lodded terrain that i would like shade deferred. I have built the g-buffer with positions/normals/albedo/depth and render vertices like I did before ...
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1answer
94 views
What is the best way to approach a multi pass rendering system?
I am trying to code a new feature in my engine but I can't find a way to implement my idea, which is the next one. I am trying to get multi pass rendering with more than two passes.
I know how to do a ...
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0answers
15 views
How to animate large and complex sprites with modular parts
I am trying to animate sprites like metal slug bosses.
But they can't be animated as regular and squared sprites because the have multiple moving parts at same time.
Considering i am talking about ...
0
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0answers
29 views
Mathematics should I learn for 2D and 3D game programming/development [duplicate]
What mathematics should I learn to become game programer 2D and 3D. From the very basic for beginner until advance
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2answers
78 views
How to switch career to game engine/graphics programming [closed]
My whole background is related to enterprise applications but I've been thinking of switching my career path from enterprise/business to something that I feel is more challenging and interesting. One ...
2
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2answers
559 views
How does cube mapping work?
Based on my reading of cube mapping tutorials so far, my understanding is that you need a direction vector, and from the direction vector we can determine the point of intersection with one of the six ...
2
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1answer
288 views
Calculating Directional Shadow Map using Camera Frustum
I'm trying to calculate the 8 corners of the view frustum so that I can use them to calculate the ortho projection and view matrix needed to calculate shadows based on the camera's position. Currently,...
0
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0answers
67 views
What's the difference between bloom and emission?
In my engine, I've implemented bloom but I also want to implement emission because some models that I have come with an emission map. It sounded to me like something adjacent to bloom but I guess it's ...
0
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1answer
80 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:
...
0
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3answers
154 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 ...
0
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1answer
100 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 ...
1
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1answer
57 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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0answers
74 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.
...
3
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0answers
346 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 ...
0
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0answers
28 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
69 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 ...
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1answer
73 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 ...
1
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1answer
171 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
votes
1answer
129 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 ...
4
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3answers
385 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
60 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 ...
2
votes
1answer
243 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
votes
1answer
249 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 ...
0
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1answer
215 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:
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1answer
237 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
93 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
90 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
188 views
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2answers
270 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 ...
0
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1answer
387 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 ...
1
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1answer
168 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
980 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 ...
1
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1answer
183 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 ...
2
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2answers
185 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 ...
0
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1answer
375 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
273 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
1k 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=...
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1answer
255 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 ...
