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[Feat] (Diligent, MG_State): cache renderbuffer resources and support color readback

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- SyncRenderbuffer now reuses the cached Diligent texture so Clear/Draw/ReadPixels target the same resource
- ReadPixels resolves renderbuffer color attachments from the read FBO
- Add DrawsToRenderbufferFramebufferFromMobileGLState; 14 Diligent tests pass
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2026-08-23 09:54:08 +08:00
parent e3f44e8da1
commit 20567fba6d
3 changed files with 111 additions and 9 deletions
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HANDOFF_DILIGENT.md
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@@ -106,6 +106,7 @@ Working tree is clean.
- `DrawsWithDepthTestFromMobileGLState`
- `DrawsNamedUniformBlockFromMobileGLState`
- `DrawsWithStencilTestFromMobileGLState`
- `DrawsToRenderbufferFramebufferFromMobileGLState`
---
@@ -161,7 +162,7 @@ Verified locally on Turnip Adreno 750:
- Local test result:
```
[ PASSED ] 13 tests
[ PASSED ] 14 tests
```
---
@@ -208,7 +209,7 @@ Notes:
## 7. Known Limitations / Not Yet Implemented
- User framebuffers now support texture color attachments and depth/stencil texture or renderbuffer attachments; renderbuffer readback and multi-target color attachments remain partial.
- User framebuffers now support texture color attachments, renderbuffer color readback, and depth/stencil texture or renderbuffer attachments; multi-target color attachments remain partial.
- Textures auto-sync `ITextureObject` → Diligent resources, including mip levels and sampler state; compressed textures and integer/3-channel formats that Diligent lacks are still skipped.
- Global UBO (default-block `glUniform*`) and named application UBO blocks (through `glBindBufferBase`/`glUniformBlockBinding`) now upload and bind; SSBOs are still not fed from frontend buffer bindings.
- No swapchain / EGL window surface presentation yet; `Present()` only flushes.
@@ -224,7 +225,8 @@ Notes:
1. **Framebuffer / Renderbuffer mapping**
- [x] Map `MG_State::GLState::FramebufferObject` attachments to Diligent `ITextureView` / `ITexture`.
- [x] Support default framebuffer as current offscreen target.
- [~] Support `glBindFramebuffer`, `glFramebufferTexture2D`, renderbuffer color/depth attachments (texture color + depth/renderbuffer work; renderbuffer readback and multiple color targets still partial).
- [x] Support `glBindFramebuffer`, `glFramebufferTexture2D`, renderbuffer color/depth attachments and renderbuffer color readback.
- [ ] Multiple simultaneous color attachments (currently single RT resolution).
2. **Texture / Sampler full integration**
- [x] Translate MobileGL `ITextureObject` to Diligent `ITexture` and cache by `GetLifetimeId()`.