BFPOWER/levlib
2
0
Fork 0
Code Issues 7 Pull Requests Actions Packages Projects Releases Wiki Activity

Platform checks

Browse Source
This commit is contained in:
Zachary Levy
2026-04-20 10:08:06 -07:00
parent 90fba74243
commit 1e2c2936a8
4 changed files with 55 additions and 29 deletions
Download Patch File Download Diff File Expand all files Collapse all files

23
draw/README.md
View File

@@ -555,3 +555,26 @@ odin run meta -- gen-shaders
```
Requires `glslangValidator` and `spirv-cross` on PATH.
### Shader format selection
The library embeds shader bytecode per compile target — MSL + `main0` entry point on Darwin (via
`spirv-cross --msl`, which renames `main` because it is reserved in Metal), SPIR-V + `main` entry
point elsewhere. Three compile-time constants in `draw.odin` expose the build's shader configuration:
| Constant | Type | Darwin | Other |
| ----------------------------- | ------------------------- | --------- | ---------- |
| `PLATFORM_SHADER_FORMAT_FLAG` | `sdl.GPUShaderFormatFlag` | `.MSL` | `.SPIRV` |
| `PLATFORM_SHADER_FORMAT` | `sdl.GPUShaderFormat` | `{.MSL}` | `{.SPIRV}` |
| `SHADER_ENTRY` | `cstring` | `"main0"` | `"main"` |
Pass `PLATFORM_SHADER_FORMAT` to `sdl.CreateGPUDevice` so SDL selects a backend compatible with the
embedded bytecode:
```
gpu := sdl.CreateGPUDevice(draw.PLATFORM_SHADER_FORMAT, true, nil)
```
At init time the library calls `sdl.GetGPUShaderFormats(device)` to verify the active backend
accepts `PLATFORM_SHADER_FORMAT_FLAG`. If it does not, `draw.init` returns `false` with a
descriptive log message showing both the embedded and active format sets.