claude_code/procedural-3d-engine
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Simplified dynamic alignment calculation

Browse source 
Fixes #381
This commit is contained in:
saschawillems 2017-10-27 22:03:21 +02:00
parent 19245a0f51
commit 5107cf3ed0
2 changed files with 13 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

9
dynamicuniformbuffer/README.md
View file

@ -48,9 +48,12 @@ First step is to calculate the alignment required for the data we want to store
```cpp
void prepareUniformBuffers()
{
// Calculate required alignment depending on device limits
size_t uboAlignment = vulkanDevice->properties.limits.minUniformBufferOffsetAlignment;
dynamicAlignment = (sizeof(glm::mat4) / uboAlignment) * uboAlignment + ((sizeof(glm::mat4) % uboAlignment) > 0 ? uboAlignment : 0);
// Calculate required alignment based on minimum device offset alignment
size_t minUboAlignment = vulkanDevice->properties.limits.minUniformBufferOffsetAlignment;
dynamicAlignment = sizeof(glm::mat4);
if (minUboAlignment > 0) {
dynamicAlignment = (dynamicAlignment + minUboAlignment - 1) & ~(minUboAlignment - 1);
}
```
The max. allowed alignment (as per spec) is 256 bytes which may be much higher than the data size we actually need for each entry (one 4x4 matrix = 64 bytes).