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feat(render3d): Vulkan in the game's window on Windows

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- gpu_select takes Vulkan for a window on Windows; gvk_init asks for VK_KHR_surface,
  VK_KHR_win32_surface and VK_KHR_swapchain when the renderer will present. A window elsewhere
  stays on OpenGL with the reason.
- gvk_open opens the window without a GL context and makes the screen images at its client area;
  gvk_swap_make builds the swapchain on the Win32 surface (FIFO with vsync, mailbox or immediate
  without) and rebuilds it when it is out of date, suboptimal or the window changes size.
- gvk_present blits the screen image into the acquired swapchain image, flipped (the screen keeps
  OpenGL's bottom-up rows), and presents it.
- Samplers pointed at a texture unit with u_i and then fed by binding units - the actors do this -
  read that unit's texture; on Vulkan they drew with the white stand-in (the tent, the log, the
  chair, the workbench).
- gl.ll carries a weak win_gl_drawable for headless macOS builds.

On the RTX 3070 Ti the windowed build runs the valley through Vulkan at 3840x2160 with the HUD and
the frame-rate readout (16 fps: every upload still waits on the frame, and buffers are
host-visible). The headless Vulkan frame is unchanged; OpenGL frames byte-identical at the five
viewpoints with 59 self-tests passing. The actor fix is compiled and OpenGL-verified, not yet
seen on the PC; blades at the grass's middle distance still draw black on Vulkan.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-15 13:08:40 +03:00
parent 66940f9c0a
commit 1b7408c6a1
4 changed files with 254 additions and 19 deletions
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11
packages/ludic.render3d/gpu.ludic
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@ -52,8 +52,9 @@ function gpu_select() -> int {
if gpu_wanted == 0 { gpu_wanted = GPU_GL }
gpu_kind = GPU_GL
if gpu_wanted == GPU_VK {
# headless for now: the swapchain on the game's window is the next milestone
if is_windowed() { gpu_fallback_reason = "the Vulkan window is not built yet" }
# a window needs a surface, and only the Win32 one is built
gvk_want_surface = is_windowed()
if is_windowed() and Os.platform() != "windows" { gpu_fallback_reason = "the Vulkan window is built for Windows only" }
else if not gvk_init() { gpu_fallback_reason = gvk_why }
else if not gvk_manifest() { gpu_fallback_reason = "the renderer's SPIR-V manifest is missing" }
else { gpu_kind = GPU_VK }
@ -228,10 +229,10 @@ function gpu_query_result(id: int, out: words) -> bool {
}
# ---- the context --------------------------------------------------------------------
function gpu_open(w: int, h: int, title: string) -> bool { if gpu_kind == GPU_VK { return gvk_open(w, h) }; return gl_open(w, h, title) }
function gpu_vsync(on: int) -> void { if gpu_kind == GPU_VK { return }; gl_vsync(on) }
function gpu_open(w: int, h: int, title: string) -> bool { if gpu_kind == GPU_VK { return gvk_open(w, h, title) }; return gl_open(w, h, title) }
function gpu_vsync(on: int) -> void { if gpu_kind == GPU_VK { gvk_vsync = on != 0; if gvk_swap != 0 { gvk_swap_stale = true }; return }; gl_vsync(on) }
function gpu_renderer_name() -> string { if gpu_kind == GPU_VK { return `{gvk_device_name} (Vulkan)` }; return gl_get_string(GL_RENDERER) }
function gpu_resize_check() -> bool { if gpu_kind == GPU_VK { return false }; let r = gl_resize_check(); gpu_glcheck_after("the resize check"); return r }
function gpu_resize_check() -> bool { if gpu_kind == GPU_VK { return gvk_resize_check() }; let r = gl_resize_check(); gpu_glcheck_after("the resize check"); return r }
# the finished frame: presented to the window, or (headless) the GPU's work finished
function gpu_present() -> void { if gpu_kind == GPU_VK { gvk_present(); return }; Gl.swap() }
# the frame as it will be presented, to a binary PPM with the top row first; before gpu_present