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Updated Xbox D3D drawing via NV2A Kelvin (markdown)

PatrickvL 2021-07-12 17:21:30 +02:00
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Xbox-D3D-drawing-via-NV2A-Kelvin.md

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Xbox D3D Drawing is performed via 4 Draw*Vertices* API's (and a few other cases, described below); Xbox D3D Drawing is performed via 4 Draw\*Vertices\* API's (and a few other cases, described below);
All 4 Draw*Vertices* API's have the two arguments (D3DPRIMITIVETYPE PrimitiveType, UINT VertexCount). Additionally: All 4 Draw*Vertices* API's have the two arguments (D3DPRIMITIVETYPE PrimitiveType, UINT VertexCount). Additionally:
* One API has a StartVertex argument * One API has a StartVertex argument
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(In the rest of this text, the "D3DDevice_" prefix is sometimes left out for terseness.) (In the rest of this text, the "D3DDevice_" prefix is sometimes left out for terseness.)
Xbox also supports immediate drawing, using one D3DDevice_BeginPush call, a D3DDevice_SetVertexData* call per vertex and one D3DDevice_EndPush API call. Xbox also supports immediate drawing, using one D3DDevice_BeginPush call, a D3DDevice_SetVertexData\* call per vertex and one D3DDevice_EndPush API call.
Similar to the other Xbox D3D API's, these API's "push" commands and data towards the Xbox GPU (called NV2A) to perform drawing. Similar to the other Xbox D3D API's, these API's "push" commands and data towards the Xbox GPU (called NV2A) to perform drawing.
( As an optimization, most of these "push buffer commands" generated by Xbox D3D API's can be recorded and replayed back to the NV2A. ( As an optimization, most of these "push buffer commands" generated by Xbox D3D API's can be recorded and replayed back to the NV2A.
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Xbox also supports two derived Draw API's : Xbox also supports two derived Draw API's :
1. D3DDevice_DrawTriPatch 1. D3DDevice_DrawTriPatch
2. D3DDevice_DrawRectPatch 2. D3DDevice_DrawRectPatch
Which get converted into push buffer commands, comparable to the Draw*Vertices* API's. Which get converted into push buffer commands, comparable to the Draw\*Vertices\* API's.
On Xbox, the D3DDevice_SetIndices API is also available, mostly as compatibility with Windows Direct3D 8; On Xbox, the D3DDevice_SetIndices API is also available, mostly as compatibility with Windows Direct3D 8;