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phase(N.5) Task 7: dispatcher SSBO + indirect buffer infrastructure

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Adds DrawElementsIndirectCommand struct (20-byte layout for
glMultiDrawElementsIndirect). Replaces _instanceVbo field on
WbDrawDispatcher with three buffers: _instanceSsbo (mat4[]),
_batchSsbo (BatchData[]), _indirectBuffer (DEIC[]). Adds BindlessSupport
constructor parameter — non-null required since the dispatcher is only
constructed when WB foundation is on (which implies bindless is present
per Task 6 capability detection).

Existing Draw() method substitutes _instanceVbo -> _instanceSsbo for
compile. Behavior is temporarily wrong (SSBO bound as ArrayBuffer for
per-vertex attribs); Tasks 9-10 fully rewrite the draw loop and the
per-frame uploads to use BindBufferBase + glMultiDrawElementsIndirect.

GameWindow construction site updated to add _bindlessSupport guard and
pass it as the new last argument to the constructor. Dispatcher is only
constructed when bindless is guaranteed present.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Erik 2026-05-08 20:25:29 +02:00
parent 12170f9d78
commit 86c471d2d1
3 changed files with 63 additions and 8 deletions
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17
src/AcDream.App/Rendering/Wb/DrawElementsIndirectCommand.cs Normal file
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using System.Runtime.InteropServices;
namespace AcDream.App.Rendering.Wb;
/// <summary>
/// Layout matches what <c>glMultiDrawElementsIndirect</c> expects.
/// Total size 20 bytes; arrays are typically uploaded with stride = sizeof(this).
/// </summary>
[StructLayout(LayoutKind.Sequential, Pack = 4)]
public struct DrawElementsIndirectCommand
{
public uint Count; // index count for this draw
public uint InstanceCount; // number of instances
public uint FirstIndex; // offset into IBO, in indices
public int BaseVertex; // vertex offset into VBO
public uint BaseInstance; // first instance ID (offsets per-instance attribs / SSBO read)
}