All Questions
13
questions
0
votes
1
answer
1k
views
fastest way to "read only" from buffer
First of all I have a struct which looks like the following:
...
- 1,299
2
votes
1
answer
3k
views
Using buffers correctly in OpenGL compute shaders
I'm re-writing an algorithm that I first wrote using matrix/vector operation into OpenGL kernels in order to try to maximiz the performances.
I have a basic knowledge of OpenGL, so I was able to get ...
- 23
2
votes
1
answer
235
views
Can the framebuffer in OpenGL jargon or its color buffer end up being the one and the same memory location as the one scanned by a display controller?
My understanding is:
the 'framebuffer' in OpenGL is a collection of buffers: many (due to swapping or stereo rendering) color buffers, (only one?) z-buffer and (only one?) stencil buffer;
each OpenGL ...
- 21
2
votes
1
answer
1k
views
In what scenarios and how does GL_ARB_buffer_storage help performance?
The Dolphin emulator for GameCube/Wii has the ability to use the ARB_buffer_storage (or EXT_buffer_storage for GLES) to improve rendering performance.
From the extension's description, a GPU driver ...
- 127
1
vote
1
answer
1k
views
Multiple VAO share a EBO (OpenGL 3.3)
As mentioned here, multiple VAOs can share a single VBO. However, can multiple VAOs share a single EBO?
For example, I want to create 2 rectangles. So, I do the following:
...
- 13
3
votes
1
answer
1k
views
How to solve Z buffer artifacts
I am currently rendering a scene in the most standard fashion possible (triangle projection and Blinn-Phong for shading)
However I am getting some artifacts:
As you can see the lion head is not ...
- 1,736
3
votes
1
answer
5k
views
Replacing Vertex Attributes (glBufferData vs glBufferSubData)
I'm sending a large number of data to the vertex shader. I use glBufferData to generate my ...
- 491
6
votes
3
answers
7k
views
What is an OpenGL VAO in a nutshell?
Before I get downvoted. I am not asking how to use them, I know how to use them. I am trying to understand what they are. For example, an array is actually a contiguous section of memory, a linked ...
- 1,736
1
vote
1
answer
687
views
Range of integers returned by glGenBuffers?
I'm developing a general Mesh class with the help of LearnOpenGL. In the example he creates a class which assumes that you want to generate a VAO, VBO, and an EBO but I don't usually use EBOs so I ...
- 491
0
votes
1
answer
913
views
OpenGL back and front buffer - counting and adjusting the number of red pixels before displaying to screen
I'm writing a function that reads the number of red pixels on the left and right halves of the screen, it makes adjustments while the difference between the number of red pixels falls outside of a ...
- 89
4
votes
1
answer
505
views
Z buffer working in OpenGL
After Z-Buffer Testing does the fragment shader run on the discarded fragments?
Does the Z-Test happen after the fragment shader runs?
Please, tell me the step by step events that occur in the Z-Test....
- 129
3
votes
1
answer
1k
views
Multiple buffers and calling glBufferSubData
In my project, for convenience I would like to use many buffers.
Many buffers in my case means 50-100 terrain patches represented by buffers with vertex coordinates, normals, indices and maybe color. ...
- 240
5
votes
1
answer
5k
views
How do double-buffers work in opengl?
As I understand, the back-buffer is used for rendering the image while the front-buffer is drawn on the screen. So if you have only one image to be drawn on the screen, then you only need to swap the ...
- 677