Co-authored-by: Claude <noreply@anthropic.com>

…loom, MSAA

Co-authored-by: Claude <noreply@anthropic.com>

…ed GPUs

Co-authored-by: Claude <noreply@anthropic.com>

…aw-indirect

When the GPU lacks MULTI_DRAW_INDIRECT support (e.g. RPi5 V3D), the
direct-draw path now tests each primitive's bounding sphere against the
camera frustum and skips off-screen primitives entirely. This avoids
submitting geometry that would be clipped anyway, reducing draw calls
on constrained hardware.

Co-authored-by: Claude <noreply@anthropic.com>

When HDR is disabled (auto-selected for Low GPU profile), the stage
renders directly to the output surface in its native format (e.g.
Rgba8UnormSrgb) instead of Rgba16Float. This halves render-target
bandwidth and eliminates the bloom and tonemapping passes entirely.

New API: Stage::set_hdr(bool) / with_hdr(bool) / get_hdr().

Co-authored-by: Claude <noreply@anthropic.com>

Add Context::with_memory_budget() to set a soft VRAM cap. Stage now
exposes used_gpu_texture_byte_size() and used_gpu_total_byte_size()
which estimate memory across render targets, atlases, bloom, IBL, and
BRDF textures. Warnings are logged when usage exceeds the budget after
atlas image additions.

Co-authored-by: Claude <noreply@anthropic.com>