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feat(render3d): gpu.ludic - the seam for a second graphics API, and what the GPU can do

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Render state (depth, blending, culling, colour writes, alpha-to-coverage, depth bias,
scissor) and uniforms go through gpu_* / u_* and nowhere else; OpenGL state is cached and
only changes reach the driver. Frames are bit-identical to before at the fixed viewpoints.
R3D_GFX=gl|vk or gpu_request chooses a backend, falling back to OpenGL with a reason.

gpu_caps_probe() asks Vulkan, on Windows, for the 1.3 floor, ray tracing, mesh shaders, the
NVIDIA RTX generation, Reflex and HDR colour spaces, for a game's settings to grey out what
a machine cannot use; R3D_CAPS pretends to be a given card for tests.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-15 09:52:12 +03:00
parent 208cad7ca1
commit 54eeef5f8d
17 changed files with 652 additions and 312 deletions
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18
packages/ludic.render3d/sky.ludic
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@ -39,7 +39,7 @@ function sky_set_rot(yaw: int) -> void {
sky_yaw = yaw
sky_rot_s = f_sin(yaw); sky_rot_c = f_cos(yaw)
}
function sky_bind_rot(prog: int) -> void { u_f2(gl_uniform(prog, "u_sky_rot"), sky_rot_s, sky_rot_c) }
function sky_bind_rot(prog: int) -> void { u_f2(gpu_uniform(prog, "u_sky_rot"), sky_rot_s, sky_rot_c) }
# direction for an equirect uv (matches equirectUV in lighting.glsl)
function sky_dir_from_uv(o: words, u: int, v: int) -> void {
@ -77,9 +77,9 @@ function sky_convolve(prog: int, target_tex: int, layer: int, w: int, h: int, ro
gl_use_program(prog)
r3d_bind_2d(prog, "u_sky", 0, sky_tex)
sky_bind_rot(prog)
u_f(gl_uniform(prog, "u_sun_clip"), hdr_clip)
u_f(gl_uniform(prog, "u_rough"), rough)
u_f(gl_uniform(prog, "u_sky_w"), fi(sky_w))
u_f(gpu_uniform(prog, "u_sun_clip"), hdr_clip)
u_f(gpu_uniform(prog, "u_rough"), rough)
u_f(gpu_uniform(prog, "u_sky_w"), fi(sky_w))
mesh_draw(sky_fullscreen)
gl_bind_framebuffer(GL_FRAMEBUFFER, 0)
let ids = gl_scratch()
@ -88,7 +88,7 @@ function sky_convolve(prog: int, target_tex: int, layer: int, w: int, h: int, ro
}
function sky_precompute() -> void {
gl_disable(GL_DEPTH_TEST)
gpu_depth_test(false)
if sky_irradiance != 0 {
let ids = gl_scratch()
ids[0] = sky_irradiance; gl_delete_textures(1, ids)
@ -126,9 +126,9 @@ function sky_bind_lighting(prog: int) -> void {
r3d_bind_2d(prog, "u_irradiance", 12, sky_irradiance)
r3d_bind_tex(prog, "u_prefilter", 13, GL_TEXTURE_2D_ARRAY, sky_prefilter)
r3d_bind_2d(prog, "u_brdf", 14, sky_brdf)
u_v3(gl_uniform(prog, "u_sun_dir"), sun_dir)
u_v3(gl_uniform(prog, "u_sun_color"), sun_color)
u_v3(gl_uniform(prog, "u_cam_pos"), cam_pos)
u_f(gl_uniform(prog, "u_prefilter_levels"), fi(SKY_PREFILTER_LEVELS))
u_v3(gpu_uniform(prog, "u_sun_dir"), sun_dir)
u_v3(gpu_uniform(prog, "u_sun_color"), sun_color)
u_v3(gpu_uniform(prog, "u_cam_pos"), cam_pos)
u_f(gpu_uniform(prog, "u_prefilter_levels"), fi(SKY_PREFILTER_LEVELS))
daylight_bind(prog)
}