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Progressive rendering during streaming

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Pre-allocate the instance SSBO on model creation (4 MB, grow-on-demand)
and append each arriving InstanceChunk directly to the GPU-side
InstanceGpu array in uploadInstanceChunk.  This makes a model drawable
as soon as its first mesh + first instance chunk land, rather than
waiting for finalizeModel.

The visible-list architecture already decouples SSBO order from the
draw path, so appending in insertion order is correct — no sorting
required.  finalizeModel collapses to:
  - compute per-mesh instance counts (for stats + sidecar round-trip)
  - build the per-model BVH over instance world AABBs

Render / pick loops now gate on ssbo_instance_count > 0 rather than
the finalized flag.  Stats include in-progress models in totals
(excluding only hidden).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Dion Moult
2026-04-12 20:29:16 +10:00
parent 1f17d73f3e
commit 298eca0ab6
2 changed files with 66 additions and 54 deletions
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src/ifcviewer/ViewportWindow.h
+2
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@@ -55,6 +55,7 @@ struct ModelGpuData {
size_t vbo_capacity = 0;
size_t ebo_capacity = 0;
size_t ssbo_capacity = 0; // bytes
size_t vbo_used = 0;
size_t ebo_used = 0;
uint32_t vertex_count = 0; // total (across all meshes)
@@ -148,6 +149,7 @@ private:
void setupVaoLayout(GLuint vao, GLuint vbo, GLuint ebo);
bool growModelVbo(ModelGpuData& m, size_t needed_total);
bool growModelEbo(ModelGpuData& m, size_t needed_total);
bool growModelSsbo(ModelGpuData& m, size_t needed_total);
ModelGpuData& getOrCreateModel(uint32_t model_id);
// Populate m.mesh_vis_first / mesh_vis_count and upload visible indices