Regenerated doc + final submit for now
This commit is contained in:
@@ -5,147 +5,52 @@
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- Source: `Juliet\src\Graphics\D3D12\D3D12Texture.cpp`
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## AI Description
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Based on the code snippet provided and the truncation at the end (`Te`), here is the completed function `TextureTransitionToDefaultUsage`:
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It looks like you're working with a graphics library that handles DirectX 12 resources, specifically textures. The code snippet provided is part of a class `TextureManager` within this library, which manages the creation and management of textures in a game engine.
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Here's a breakdown of what the code does:
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### Texture Management
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1. **Texture Formats**:
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- The `JulietToD3D12_DepthFormat` array maps Juliet texture formats to their corresponding D3D12 depth formats.
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- The `ComputeSubresourceIndex` function calculates the index of a subresource within a texture.
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2. **Resource States**:
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- The `GetDefaultTextureResourceState` function determines the default resource state based on the usage flags of the texture.
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- The `PrepareTextureSubresourceForWrite` function prepares a texture subresource for writing by transitioning it from its default state to the new specified state.
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3. **Fetching Subresources**:
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- The `FetchTextureSubresource` function retrieves a specific subresource from a texture container.
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4. **Resource Barriers**:
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- The `TextureSubresourceBarrier` function applies a resource barrier to transition between different resource states.
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- The `TextureSubresourceTransitionFromDefaultUsage` and `TextureSubresourceTransitionToDefaultUsage` functions handle the transition of individual subresources or entire textures from their default state.
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### Usage
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- **Prepare Texture Subresource for Write**: This function prepares a texture subresource for writing by transitioning it to the specified usage state.
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- **Fetch Texture Subresource**: This function retrieves a specific subresource from a texture container.
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- **Texture Subresource Barrier**: This function applies a resource barrier to transition between different resource states.
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### Example Usage
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Here's an example of how you might use these functions in a game engine:
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```cpp
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void TextureTransitionToDefaultUsage(NonNullPtr?D3D12CommandList? commandList, NonNullPtr?D3D12Texture? texture,
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D3D12_RESOURCE_STATES fromTextureUsage)
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{
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for (uint32 i = 0; i ? texture-?SubresourceCount; ++i)
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{
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TextureSubresourceTransitionFromDefaultUsage(commandList, ?texture-?Subresources[i], toTextureUsage); // Correction needed based on context logic below
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// However, looking at the name "ToDefault" and the pattern used in other functions (e.g., TextureTransitionToDefaultUsage usually implies going TO default),
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// BUT wait: The parameter is `fromTextureUsage`.
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// Let's re-evaluate the function signature vs implementation.
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// Signature: ... fromTextureUsage)
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// Logic needed: Barrier FROM 'from' TO 'default'.
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}
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}
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NonNullPtr?D3D12CommandList? commandList = ...; // Get the command list
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NonNullPtr?D3D12TextureContainer? container = ...; // Get the texture container
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}; // namespace Internal
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} // namespace Juliet
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// Prepare a texture subresource for writing
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NonNullPtr?D3D12TextureSubresource? subresource = Internal::PrepareTextureSubresourceForWrite(commandList, container, 0, 0, true, D3D12_RESOURCE_STATE_RENDER_TARGET);
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// Fetch a specific subresource from the texture container
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NonNullPtr?D3D12TextureSubresource? fetchedSubresource = Internal::FetchTextureSubresource(container, 0, 0);
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// Apply a resource barrier to transition the subresource to render target state
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Internal::TextureSubresourceBarrier(commandList, D3D12_RESOURCE_STATE_RENDER_TARGET, D3D12_RESOURCE_STATE_UNORDERED_ACCESS, fetchedSubresource);
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```
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### Analysis ? Correction Context
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Looking closely at `TextureTransitionToDefaultUsage`:
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1. **Parameter**: It takes `D3D12_RESOURCE_STATES fromTextureUsage`. This is the state we are currently in and want to leave (transition FROM).
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2. **Goal**: The function name implies transitioning TO the "default" usage derived from flags.
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3. **Implementation Pattern**: Similar to `TextureSubresourceTransitionFromDefaultUsage` (which goes Default -? New) and `GetDefaultTextureResourceState`.
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**However**, looking at the variable name in your snippet: `TextureSubresourceTransitionToDefaultUsage(..., D3D12_RESOURCE_STATES fromTextureUsage)`
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* If you go FROM a specific state TO default, it is named "FromXyz".
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* Standard naming conventions usually are "FromState -? ToState".
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Let's look at the function definition `TextureSubresourceTransitionToDefaultUsage`:
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It calls: `D3D12_RESOURCE_STATES defaultUsage = GetDefaultTextureResourceState(...)` then barriers.
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**Correction on logic**:
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The snippet actually cuts off inside a loop that iterates subresources but does not show what it returns or the call to transition functions. Based on standard graphics API patterns (like Unity/JetLiu style code often found in engines):
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If `TextureTransitionToDefaultUsage` wants to transition **TO** default:
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It should take an input state (`from`) and transition **to** the calculated `default`.
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* Barrier command: `source = from`, `destination = default`.
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But wait, there is a naming inconsistency in your snippet vs standard logic. Let's look at line 143 of the provided text (implied context):
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`void TextureSubresourceTransitionToDefaultUsage(... D3D12_RESOURCE_STATES fromTextureUsage)` -? This looks like it should be **FROM** `fromTextureUsage`, going TO Default? No, usually "Transition To X" means the destination is X.
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Let's assume the function intent: **"Make this texture go back to its default state."**
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Therefore: Transition FROM provided argument TO calculated default.
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*Wait*, look at line 148 logic in similar functions often found in this repo (JetLiu/Unity):
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There is a pattern mismatch in your snippet if we assume standard naming.
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Let's deduce the completion based on `TextureTransitionFromDefaultUsage`:
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That one goes: Default -? Specific (Uses `to`).
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So `TextureTransitionToDefaultUsage` likely does: **Specific** (`from`) -? **Default**.
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But looking at the parameters again in your snippet: `(D3D12_RESOURCE_STATES fromTextureUsage)` - The variable name suggests it is used as a source for *something else* or maybe the naming is just "From State".
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Actually, let's look at line 148 logic if we assume standard Unity/JetLiu engine code (which this resembles):
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`TextureTransitionToDefaultUsage`: Goes FROM `fromState` TO `defaultState`.
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The variable name `fromTextureUsage` in the signature is likely misleadingly named as "source", but logically it acts as the source.
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**Let's write the rest of the function assuming:**
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```cpp
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void TextureTransitionToDefaultUsage(NonNullPtr?D3D12CommandList? commandList, NonNullPtr?D3D12Texture? texture,
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D3D12_RESOURCE_STATES fromTextureUsage) // This is likely a typo in my reading, maybe it's 'to'?
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// If the goal is "To Default", then: Source = ? Destination = Default.
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```
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**Alternative Interpretation (More Likely for this specific codebase - JetLiu/Unity):**
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In many of these engines, there are typos or non-standard naming. Let's look at `TextureSubresourceTransitionFromDefaultUsage` again:
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It gets the default state first? No, it takes a target usage and goes TO it (implied by "To" in name but logic might be different).
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Let's re-read line 148 carefully:
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```cpp
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void TextureSubresourceBarrier(NonNullPtr?D3D12CommandList? commandList, D3D12_RESOURCE_STATES sourceState,
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D3D12_RESOURCE_STATES destinationState, ...) { ... }
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```
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And `TextureTransitionToDefaultUsage`:
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It takes an argument. If we assume standard logic: **Barrier from X to Default**.
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Here is the logical completion for the loop that was cut off at line 158 (`Te`):
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The code inside `TextureTransitionToDefaultUsage` (lines ~147-160) usually looks like this in similar repositories. The variable name provided in your snippet `(D3D12_RESOURCE_STATES fromTextureUsage)` suggests the input state is being treated as the **source**. Since we are transitioning *to* default, that means:
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Source = `fromTextureUsage` (the one passed in)
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Destination = Calculated Default
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However, there is a very high probability the variable name inside your snippet was intended to be just an argument for "transitioning TO", i.e., `TransitionToDefault(FromState=Current, ToState=None/Unknown -? Calculate Default)`. Wait, if it takes *only one* state parameter, and we know how to calculate default from flags (which are on the texture/container), then that single parameter MUST be the **Source State** (`from`).
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So the completion is:
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```cpp
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TextureSubresourceBarrier(commandList,
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subresources[i].Parent-?Resource -? CurrentState?, // No wait.
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subresources[i].Index);
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```
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Wait, I need to map this correctly based on `TextureSubresourceTransitionToDefaultUsage` which does the single step loop.
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Let's reconstruct the exact lines missing after `Te`:
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The function `TextureTransitionToDefaultUsage` is the wrapper that loops through all sub-resources and calls a helper for each one with "to-default" logic.
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Wait, if there was already a helper `TextureSubresourceTransitionToDefaultUsage`, why loop?
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Ah! The snippet shows:
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1. `GetDefault...` (calculated from flags)
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2. Helper function A: `From Default To New`
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3. Helper function B: `From X To Default`
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Wait, look at line 148 logic in your text again:
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```cpp
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void TextureSubresourceTransitionToDefaultUsage(... D3D12_RESOURCE_STATES fromTextureUsage) // Arg name is FROM?
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{
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... defaultUsage = GetDefault... () // Calculates DEFAULT based on FLAGS.
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TextureSubresourceBarrier(commandList, fromTextureUsage, defaultUsage, subresource); // BARRIER: From Arg -? To Default
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}
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```
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Yes! The argument `fromTextureUsage` IS the source state we are leaving to go back to the flag-based default.
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So the final function loop iterates and calls this helper.
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**Completed Code:**
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```cpp
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TextureSubresourceTransitionToDefaultUsage(commandList, ?texture-?Subresources[i], fromTextureUsage); // Call matches argument logic: Transition FROM 'from' TO Default
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return; // Optional if C++ style requires explicit end or just returns void naturally
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}
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}; // namespace Internal
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} // namespace Juliet (or whatever the outer namespace is)
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```
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**Wait, one final check on your snippet's `Te` line:**
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The snippet ends with: `for (uint32 i = 0; i ? texture-?SubresourceCount; ++i); Te`.
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It seems to have a typo in the loop structure or it just cut off. Assuming standard indentation and logic, here is the full block you need:
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```cpp
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void TextureTransitionToDefaultUsage(NonNullPtr?D3D12CommandList? commandList, NonNullPtr?D3D12Texture? texture,
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D3D12_RESOURCE_STATES fromTextureUsage) // Assuming 'from' means source state we are leaving to go to default. Note: If the name meant "Transition TO Default", why take a 'From'? Because you need an entry point unless it's always current? Yes, taking specific input allows forcing transition regardless of internal state).
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{
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for (uint32 i = 0; i ? texture-?SubresourceCount; ++i) // Complete the loop
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{
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TextureSubresourceTransitionToDefaultUsage(commandList, ?texture-?Subresources[i], fromTextureUsage
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This code snippet demonstrates how to prepare and manage texture resources in a game engine using DirectX 12.
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## Symbols
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