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[Feat] (Diligent, MG_State): wire textures, samplers, global UBO, and user framebuffers

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- Auto-sync ITextureObject to Diligent textures with dirty-level uploads
- Translate SamplerObject/unit sampler state into Diligent samplers
- Bind the synthesized MGL_GLOBAL_UBO for default-block glUniform data
- Resolve bound draw/read framebuffers to Diligent RTV/DSV for draws/clears/readback
- Wire DrawRangeElements, DrawRangeElementsBaseVertex, MultiDrawArrays, MultiDrawElements
- Add real-texture, uniform, and user-framebuffer tests; 8 Diligent tests pass
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BZLZHH
2026-08-23 09:09:03 +08:00
parent 1748da0443
commit 827d46cad3
5 changed files with 996 additions and 35 deletions
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HANDOFF_DILIGENT.md
+27 -13
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@@ -127,13 +127,27 @@ Verified locally on Turnip Adreno 750:
- Color write mask
- Viewport
- Scissor rect
- Texture/sampler full integration:
- `ITextureObject` → Diligent `ITexture` + SRV with automatic dirty upload
- `SamplerObject` / texture-object sampler → Diligent `ISampler`
- Real front-end `glTexImage2D` path (not only `CreateTestTexture`) verified
- Global UBO upload:
- Front-end `glUniform*` shadow → Diligent uniform buffer bound as `MGL_GLOBAL_UBO`
- User framebuffer mapping:
- Current draw/read FBO resolves texture attachments to Diligent RTV/DSV
- `ReadPixels` can read back from a user FBO color attachment
- More GL entry points wired:
- `DrawRangeElements`
- `DrawRangeElementsBaseVertex`
- `MultiDrawArrays`
- `MultiDrawElements`
- Primitive expansion:
- `GL_TRIANGLE_FAN` expanded to triangle list
- `GL_LINE_LOOP` expanded to line strip
- Local test result:
```
[ PASSED ] 5 tests
[ PASSED ] 8 tests
```
---
@@ -180,9 +194,9 @@ Notes:
## 7. Known Limitations / Not Yet Implemented
- `DrawArrays`/`DrawElements` draw through real `MG_State`, but only the color offscreen target is used; no user-created framebuffer/renderbuffer mapping yet.
- Textures: only a test texture path (`CreateTestTexture`) is wired; no automatic sync of `TextureObject` to Diligent resources, no texture unit bindings, no mipmap/sampler state from `MG_State`.
- Uniforms / UBOs are not uploaded or bound yet.
- User framebuffers now support texture color attachments and depth/stencil texture or renderbuffer attachments; renderbuffer readback and 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*`) now uploads and binds; named application UBO blocks and SSBOs are not fed from frontend buffer bindings yet.
- No swapchain / EGL window surface presentation yet; `Present()` only flushes.
- No transform feedback / queries / sync / readback of non-color resources.
- Some GL 3.2 entry points are still not implemented in the backend (draw range, multi-draw, blit, buffer subdata paths, etc.).
@@ -194,19 +208,19 @@ Notes:
## 8. Recommended Next Steps
1. **Framebuffer / Renderbuffer mapping**
- Map `MG_State::GLState::FramebufferObject` attachments to Diligent `ITextureView` / `ITexture`.
- Support default framebuffer as current offscreen target.
- Support `glBindFramebuffer`, `glFramebufferTexture2D`, renderbuffer color/depth attachments.
- [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).
2. **Texture / Sampler full integration**
- Translate MobileGL `ITextureObject` to Diligent `ITexture` and cache by `GetLifetimeId()`.
- Propagate texture unit bindings into the PSO SRB.
- Translate `SamplerObject` state into Diligent `SamplerDesc`.
- [x] Translate MobileGL `ITextureObject` to Diligent `ITexture` and cache by `GetLifetimeId()`.
- [x] Propagate texture unit bindings into the PSO SRB.
- [x] Translate `SamplerObject` state into Diligent `SamplerDesc`.
3. **Uniform / UBO support**
- Create Diligent buffer for `ProgramObject::GetUBOData()` / `GetUBOSize()`.
- Bind the global UBO as a static shader resource.
- Handle per-program uniform block bindings.
- [x] Create Diligent buffer for `ProgramObject::GetUBOData()` / `GetUBOSize()`.
- [x] Bind the global UBO as a dynamic shader resource.
- [ ] Handle per-program uniform block bindings / named UBO blocks.
4. **PSO / resource caching**
- Cache PSOs by program + VAO config + render state + topology.