Questions tagged [graphics-programming]
Programming related to the visual representation of information on computer screens.
379
questions
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11 views
How to get world coordinates from a 4X4 camera matrix
I have Intel T265 camera which has a camera coordinates system like following diagram:
The camera system has two cameras and the center of the two cameras is the position of the camera system.
The ...
0
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0answers
24 views
How many texture units are available per shader stage when compared to the total number available on hardware?
The answer to the question How many textures can usually I bind at once?, given here, explains that:
OpenGL 3.x defines the minimum number for the per-stage limit to be 16...
and that there can be a ...
0
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1answer
40 views
How to construct a matrix with the following mapping
How would I create a matrix that maps coordinates like so:
Near plane
x: [-3,3] -> [-1,1]
y: [-6,2] -> [-1,1]
z: 2 -> -1
Far plane
...
2
votes
0answers
12 views
How to make use of resizable BAR?
From what I understand, resizable BAR (aka. Smart Access Memory) makes it possible to access the whole GPU memory from CPU code. But how can a programmer make use of that?
Is there an example or code ...
3
votes
1answer
217 views
What is GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS?
I am a beginner in OpenGL. I am learning about textures in OpenGL. What I don't understand is how to determine how many texture units are in the GPU. I heard someone said that you can see how many ...
0
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0answers
36 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
54 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 ...
0
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2answers
78 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 ...
0
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0answers
148 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 ...
0
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1answer
77 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 ...
0
votes
1answer
84 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
105 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
vote
1answer
81 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
votes
1answer
81 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
vote
1answer
121 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
106 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 ...
-1
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1answer
118 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 ...
0
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0answers
20 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
31 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
0
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2answers
96 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
votes
2answers
662 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
votes
1answer
388 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
votes
1answer
129 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
208 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
votes
1answer
125 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
vote
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... ...
0
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0answers
91 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
votes
0answers
429 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
votes
0answers
30 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:
...
0
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0answers
82 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 ...
1
vote
1answer
87 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
vote
1answer
188 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
140 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
votes
3answers
533 views
How to draw a smoother solid-fill circle?
I'm experimenting with drawing circles and have brute-forced a very simple one:
Pseduocode:
...
0
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2answers
62 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
290 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
317 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
254 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
votes
1answer
238 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 ...
1
vote
2answers
128 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
93 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
votes
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, ...
0
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3answers
205 views
0
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2answers
304 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
votes
1answer
490 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
vote
1answer
183 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
votes
1answer
1k 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
vote
1answer
210 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
votes
2answers
205 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
415 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?
