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feat(render3d): mesh-shader grass

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The chunked grass path draws each chunk as one mesh-shader dispatch when the
setting asks and the card has VK_EXT_mesh_shader: work group y is a tile, x a
batch of 16 of its blades, and a blade the placement, density, frustum, water
or slope tests reject emits nothing - the instanced path still runs its eight
vertices to a degenerate position. grass.mesh generates the same blades as
grass.vert (grass_blade_mesh(4)'s rows, the same hashes, sway and lighting
normal), capped at the instanced path's 65535 a tile.

Vulkan: VK_EXT_mesh_shader with meshShader, and maintenance4 (glslang's mesh
stages declare LocalSizeId); vkCmdDrawMeshTasksEXT looked up per device, as the
Streamline interposer exports none; a *.mesh program's pipeline takes the mesh
stage and no vertex input, its bindings the mesh stage bit. gpu_has_mesh,
gpu_draw_mesh_tasks; r3d_mesh_grass and R3D_MESH_GRASS / R3D_NO_MESH.
bin/ludic-dev rebuilt: the committed binary predated the shader tool's mesh
support and compiled grass.mesh as a vertex stage.

PC (RTX 3070 Ti): the camp matches the chunked path; validation only the
no-window present-id message.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-15 20:20:42 +03:00
parent 6525c11b3c
commit 750d13779d
10 changed files with 334 additions and 13 deletions
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3
runtime/native/vk.ludic
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@ -43,3 +43,6 @@ extern function vk_sl_call_p(fn: pointer, a: pointer) -> int = "lsl_call_p"
extern function vk_sl_call_pp(fn: pointer, a: pointer, b: pointer) -> int = "lsl_call_pp"
extern function vk_sl_call_ppp(fn: pointer, a: pointer, b: pointer, c: pointer) -> int = "lsl_call_ppp"
extern function vk_sl_call_ip(fn: pointer, a: int, b: pointer) -> int = "lsl_call_ip"
# a command-buffer command with three counts through a pointer (vkCmdDrawMeshTasksEXT, which the
# Streamline interposer does not export; looked up with vkGetDeviceProcAddr)
extern function vk_sl_call_piii(fn: pointer, a: pointer, b: int, c: int, d: int) = "lsl_call_piii"