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render3d(vulkan): MSAA - multisampled renderbuffers, resolved in a draw-less pass

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gpu_rb_storage makes the image with the samples asked for; a pass takes its attachments' count and
every pipeline in it matches; a blit from a multisampled source resolves on the end of an empty
dynamic-rendering pass (colour averaged, depth from sample zero - vkCmdResolveImage cannot do depth).
gpu_msaa_max reads the device's colour-and-depth sample limits, and post_set_msaa clamps to it, so
the Anti-aliasing setting is live on Vulkan. The pipeline cache's pass key no longer packs samples
into three bits.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-15 16:21:52 +03:00
parent 97d75e1d5e
commit bda53f759e
4 changed files with 74 additions and 7 deletions
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11
packages/ludic.render3d/gpu.ludic
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@ -819,7 +819,13 @@ function gpu_rb_new() -> int {
}
# storage for a renderbuffer: samples > 0 makes it multisampled
function gpu_rb_storage(rb: int, ifmt: int, w: int, h: int, samples: int) -> void {
if gpu_kind == GPU_VK { gvk_flush(); gpu_rb_samples = samples; gvk_tex_storage(rb, false, ifmt, w, h, 1, false); return }
if gpu_kind == GPU_VK {
gvk_flush(); gpu_rb_samples = samples
gvk_storage_samples = samples
gvk_tex_storage(rb, false, ifmt, w, h, 1, false)
gvk_storage_samples = 1
return
}
gl_bind_renderbuffer(GL_RENDERBUFFER, rb)
if samples > 0 { gl_renderbuffer_storage_multisample(GL_RENDERBUFFER, samples, ifmt, w, h) }
else { gl_renderbuffer_storage(GL_RENDERBUFFER, ifmt, w, h) }
@ -928,6 +934,9 @@ function gpu_blit(w: int, h: int, mask: int) -> void {
# the framebuffer the finished frame is presented from (an offscreen one, headless)
function gpu_screen_fb() -> int { if gpu_kind == GPU_VK { return 0 }; return gl_screen }
function gpu_multisample(on: bool) -> void { if gpu_kind == GPU_VK { return }; gpu_gl_cap(GL_MULTISAMPLE, gpu_b(on)); gpu_glcheck_after("multisample") }
# the most samples the scene may be drawn with: the device's colour-and-depth limit on Vulkan (0 before
# it is open), 4 on OpenGL, which has always asked for up to that
function gpu_msaa_max() -> int { if gpu_kind == GPU_VK { return gvk_msaa_max }; return 4 }
function gpu_wireframe(on: bool) -> void {
if gpu_kind == GPU_VK { gvk_wireframe = gpu_b(on); return }
if on { gl_polygon_mode(GL_FRONT_AND_BACK, GL_LINE) } else { gl_polygon_mode(GL_FRONT_AND_BACK, GL_FILL) }