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ludic/packages/ludic.render3d/render.ludic
Orkuncakilkaya 5b3cfac48e render3d: the height field and photograph on the CPU as tiles read from a file (off until the game asks) 
terrain_tiles_to(dir, key) before a map is made: once made, its heights, photograph and baked normals
are written tile by tile (64 m, TT_TEX) to <dir>/<key>.tiles - fresh every time, header last, so no
other generator's or a torn file is ever read - and the whole copies go. Every read goes through the
tile: resident, else read from the file there and then into a 2048-tile clock, so terrain_height,
terrain_height_smooth, terrain_ortho* and terrain_chunk_heights answer exactly what the whole copy
did (R3D_TT_CHECK: worst 0.0 m over 4000 points) whatever is resident - two machines and the boot's
placements agree to the bit. terrain_chunk_heights takes render3d_st mut for it.

terrain_height_near(read-only): the tile if it is in, else a coarse 2048^2 level (worst 0.91 m), never
the file - for line checks that must not take render3d_st mut. terrain_texel() is the texel size,
terrain_tiles_prefetch(x, z, r, budget) reads ahead, and a frame that reads more than 8 tiles says so
once. R3D_TERRAIN_TILES=<dir> turns it on for a run.

At the overlook with MallocLargeCache=0: 1731 MB off, 1658 MB on; 192 MB written in ~200 ms; the
frame unchanged (0 pixels over 8).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-09-29 16:53:28 +03:00

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# ============================================================================
# render.ludic — the frame. Shadow cascades, the HDR scene pass (terrain, the
# scene's objects, the sky), bloom, and the tonemapped composite to the screen.
# The scene (what the game places in the world) hooks in through scene_draw /
# scene_draw_casters, which the demo defines.
# ============================================================================
# Both of these are the DAY's, set by daylight_set from the sun's own elevation. The inscatter
# is how hard the air scatters the sun forward - nearly nothing at noon, and the glow a ridge
# is silhouetted against at dusk. The desaturation is how fast distance takes a surface's own
# colour away, which is the term that was missing entirely and is most of why a midday frame
# had no depth in it at all.
# How much of the visible sky's colour comes from the analytic model rather than from the
# photograph (sky.frag). The day fades it in: at night the sky has its own tint, a star field
# and a moon, and relighting on top of those would only wash them out.
# What the ground reflects back up, low and high, and the height they cross at. The defaults
# are Maroon Lake's - a green basin under a grey-rock treeline at about 480 m over the datum.
# set before r3d_init to build the landscape from a real height map
# A plate: no terrain, no grass, no water - the sky, the sun, the shadows and whatever the scene
# draws (a lab's stage, ludic.lab). Set before the load; nothing of the landscape is made, so
# its hundreds of megabytes of height field, materials and grass never exist.
function r3d_plate_mode(render3d_st: mut Render3dState, on: bool) -> void { render3d_st.r3d_plate = on }
# the sky's HDR image, when it is not the default photograph under r3d_assets
# R3D_NOPREPASS=1: light the foliage the old way, every card behind the front one included
function r3d_prepass_off(render3d_st: mut Render3dState) -> bool {
if render3d_st.r3d_prepass_env < 0 { render3d_st.r3d_prepass_env = 0; if r3d_env_has(render3d_st, "R3D_NOPREPASS") { render3d_st.r3d_prepass_env = 1 } }
return render3d_st.r3d_prepass_env == 1
}
function fog_bind(render3d_st: mut Render3dState, prog: int) -> void {
u_f(render3d_st, gpu_uniform(render3d_st, prog, "u_clip_y"), render3d_st.r3d_clip_y)
u_f(render3d_st, gpu_uniform(render3d_st, prog, "u_spec_scale"), 1.0)
u_f(render3d_st, gpu_uniform(render3d_st, prog, "u_fog_density"), render3d_st.r3d_fog_density)
u_f(render3d_st, gpu_uniform(render3d_st, prog, "u_fog_height_falloff"), render3d_st.r3d_fog_falloff)
u_f(render3d_st, gpu_uniform(render3d_st, prog, "u_fog_base"), render3d_st.r3d_fog_base)
u_f(render3d_st, gpu_uniform(render3d_st, prog, "u_fog_inscatter"), render3d_st.r3d_fog_inscatter)
u_f(render3d_st, gpu_uniform(render3d_st, prog, "u_fog_desat"), render3d_st.r3d_fog_desat)
u_f(render3d_st, gpu_uniform(render3d_st, prog, "u_fog_wall"), render3d_st.r3d_fog_wall)
u_f3(render3d_st, gpu_uniform(render3d_st, prog, "u_ground_alb"), render3d_st.r3d_ground_alb_r, render3d_st.r3d_ground_alb_g, render3d_st.r3d_ground_alb_b)
u_f3(render3d_st, gpu_uniform(render3d_st, prog, "u_ground_alb_hi"), render3d_st.r3d_ground_hi_r, render3d_st.r3d_ground_hi_g, render3d_st.r3d_ground_hi_b)
u_f(render3d_st, gpu_uniform(render3d_st, prog, "u_ground_hi_y"), render3d_st.r3d_ground_hi_y)
u_f(render3d_st, gpu_uniform(render3d_st, prog, "u_ground_hi_w"), render3d_st.r3d_ground_hi_w)
var cs = render3d_st.r3d_cloud_shadow
if r3d_env_has(render3d_st, "R3D_NOCLOUD") { cs = 0.0 }
u_f(render3d_st, gpu_uniform(render3d_st, prog, "u_cloud_shadow"), cs)
u_f(render3d_st, gpu_uniform(render3d_st, prog, "u_time"), render3d_st.r3d_time)
}
# The fog wall (a game's fog setting): dist > 0 hides everything past dist in the sky's colour - from
# three tenths of it to all of it - and draws nothing past it in any pass: the far plane, every scatter
# layer's reach, the shadow cascades. dist <= 0 leaves everything as it was.
const R3D_FOG_MARGIN: float = 8.0
export function r3d_fog_wall(render3d_st: mut Render3dState, dist: float) -> void {
var d = dist
if d < 0.0 { d = 0.0 }
if d == render3d_st.r3d_fog_wall { return }
render3d_st.r3d_fog_wall = d
# every layer and stream re-gathers for the new reach
render3d_st.sc_view_gen += 1
cam_update(render3d_st)
fog_impostors(render3d_st)
shadow_fog(render3d_st)
fog_streams(render3d_st)
}
# how far anything is drawn: the fog wall and a margin, or `far` (0: no limit of its own) without one
function r3d_reach(render3d_st: Render3dState, far: float) -> float {
if render3d_st.r3d_fog_wall <= 0.0 { return far }
let w = render3d_st.r3d_fog_wall + R3D_FOG_MARGIN
if far <= 0.0 or far > w { return w }
return far
}
# profiling switches (environment): R3D_NOSHADOW R3D_NOGI R3D_MSAA=n R3D_NOBLADES R3D_NOCARDS R3D_NOTREES R3D_NEAR=m
function r3d_env_flags(render3d_st: mut Render3dState) -> void {
render3d_st.r3d_no_shadow = r3d_env_has(render3d_st, "R3D_NOSHADOW")
render3d_st.r3d_no_trees = r3d_env_has(render3d_st, "R3D_NOTREES")
render3d_st.r3d_no_refl = r3d_env_has(render3d_st, "R3D_NOREFL")
# R3D_FOG_WALL=<m>: the fog wall at that distance, for a shot (a game sets it with r3d_fog_wall)
# R3D_TERRAIN_TILES=<dir>: the height field and photograph as tiles in that directory (terrain_tiles_to)
if r3d_env_has(render3d_st, "R3D_TERRAIN_TILES") and render3d_st.tt_dir == "" { terrain_tiles_to(render3d_st, r3d_env(render3d_st, "R3D_TERRAIN_TILES"), "terrain") }
if r3d_env_has(render3d_st, "R3D_FOG_WALL") { render3d_st.r3d_fog_wall = float(Text.to_int(r3d_env(render3d_st, "R3D_FOG_WALL"))) }
if r3d_env_has(render3d_st, "R3D_DEBUG") { render3d_st.r3d_debug = true }
if r3d_env_has(render3d_st, "R3D_DBGSHADOW") { render3d_st.r3d_debug_shadow = true }
if r3d_env_has(render3d_st, "R3D_NOGI") { render3d_st.post_gi_strength = 0.0; render3d_st.post_ao_strength = 0.0; render3d_st.post_no_gi = true }
if r3d_env_has(render3d_st, "R3D_MSAA") { render3d_st.post_ms_samples = Text.to_int(r3d_env(render3d_st, "R3D_MSAA")) }
render3d_st.sc_skip_blade = r3d_env_has(render3d_st, "R3D_NOBLADES")
render3d_st.sc_skip_grass = r3d_env_has(render3d_st, "R3D_NOGRASS")
render3d_st.grass_force = r3d_env_has(render3d_st, "R3D_BLADES")
render3d_st.grass_env_off = r3d_env_has(render3d_st, "R3D_NOBLADES")
render3d_st.sc_skip_card = r3d_env_has(render3d_st, "R3D_NOCARDS")
render3d_st.sc_dbg_lod = r3d_env_has(render3d_st, "R3D_LODDBG")
if r3d_env_has(render3d_st, "R3D_ANISO") {
let a = Text.to_int(r3d_env(render3d_st, "R3D_ANISO"))
render3d_st.tex_anisotropy = 1.0
if a >= 2 { render3d_st.tex_anisotropy = 2.0 }
if a >= 4 { render3d_st.tex_anisotropy = 4.0 }
if a >= 8 { render3d_st.tex_anisotropy = 8.0 }
if a >= 16 { render3d_st.tex_anisotropy = 16.0 }
}
}
# Start the renderer in one call: the window, then every load step in order. A game that shows
# a loading screen calls r3d_open, draws its screen, and runs r3d_load_step itself between frames.
function r3d_init(render3d_st: mut Render3dState, w: int, h: int, title: string) -> bool {
if not r3d_open(render3d_st, w, h, title) { return false }
for i in 0 .. r3d_load_count() { if not r3d_load_step(render3d_st, i) { return false } }
return true
}
# the window and the graphics backend; nothing is baked yet, but a frame can be presented
function r3d_open(render3d_st: mut Render3dState, w: int, h: int, title: string) -> bool {
r3d_env_flags(render3d_st)
# Vulkan or nothing: a machine it cannot start on stops here, with the reason already printed
if gpu_select(render3d_st) != GPU_VK { return false }
if not gpu_open(render3d_st, w, h, title) { print("r3d: the Vulkan window or device could not be made"); return false }
if r3d_env_has(render3d_st, "R3D_NOVSYNC") { gpu_vsync(render3d_st, 0) }
var renderer: string = gpu_renderer_name(render3d_st)
print(`r3d: {gl_width()}x{gl_height()} on {renderer}`)
prof_init(render3d_st)
cam_init(render3d_st, float(gl_width()) / float(gl_height()))
return true
}
# The load, as steps a loading screen can show between: 0 the sky and its image-based light,
# 1 - 4 the terrain (the height field and normals, its sun shadow, its materials, its patches and
# programs), 5 the shadow maps and the screen targets, 6 the scattered cover and the actors, 7 the
# grass and the sky pass. The order is r3d_init's.
function r3d_load_count() -> int { return 4 + TERRAIN_INIT_STEPS }
function r3d_load_step(render3d_st: mut Render3dState, i: int) -> bool {
let t = i - 1
if i == 0 {
# the default sky's path is made only when no path was given, and goes once the sky is read
var sky = render3d_st.r3d_sky_path
var made: string = null
if sky == null {
made = render3d_st.r3d_assets + "/hdri/kloofendal_48d_partly_cloudy_puresky_4k.hdr"
sky = made
}
let got = sky_load(render3d_st, sky)
if made != null { free(made) }
if not got { return false }
daylight_init(render3d_st)
} else if t >= 0 and t < TERRAIN_INIT_STEPS {
if render3d_st.r3d_plate { return true }
if t == 0 {
if render3d_st.r3d_dem_path != null { terrain_use_dem(render3d_st, render3d_st.r3d_dem_path, render3d_st.r3d_dem_min, render3d_st.r3d_dem_max, render3d_st.r3d_dem_base, render3d_st.r3d_dem_ox, render3d_st.r3d_dem_oz) }
if render3d_st.r3d_ortho_path != null { terrain_use_ortho(render3d_st, render3d_st.r3d_ortho_path) }
}
terrain_init_step(render3d_st, t)
} else if i == 1 + TERRAIN_INIT_STEPS {
shadow_init(render3d_st)
post_init(render3d_st, gl_width(), gl_height())
} else if i == 2 + TERRAIN_INIT_STEPS {
scatter_init(render3d_st)
actor_init(render3d_st)
} else if i == 3 + TERRAIN_INIT_STEPS {
if not render3d_st.r3d_plate { grass_init(render3d_st) }
render3d_st.r3d_sky_prog = r3d_program(render3d_st, "fullscreen.vert", "sky.frag", "")
# The base is NOON's air, and it was tuned when nothing desaturated with distance - so it
# was doing its whole job through colour and could not be raised without the valley going
# blue. With the desaturation term carrying the depth, the air can be as thick as real air
# at 2900 m and the far ridge recedes instead of tinting.
render3d_st.r3d_fog_density = 0.00024
render3d_st.r3d_fog_falloff = 0.002
render3d_st.r3d_ready = true
gpu_check(render3d_st, "r3d init")
}
return true
}
function r3d_draw_sky(render3d_st: mut Render3dState) -> void {
gpu_depth_func(render3d_st, GL_LEQUAL)
gpu_depth_write(render3d_st, false)
gpu_cull(render3d_st, false)
let p = render3d_st.r3d_sky_prog
gpu_use_program(render3d_st, p)
r3d_bind_2d(render3d_st, p, "u_sky", 0, render3d_st.sky_tex)
sky_bind_rot(render3d_st, p)
sky_bind_lighting(render3d_st, p)
u_mat4(render3d_st, gpu_uniform(render3d_st, p, "u_inv_vp"), render3d_st.cam_inv_vp)
u_f(render3d_st, gpu_uniform(render3d_st, p, "u_sky_gain"), 0.95)
u_f(render3d_st, gpu_uniform(render3d_st, p, "u_sky_relight"), render3d_st.r3d_sky_relight)
u_f(render3d_st, gpu_uniform(render3d_st, p, "u_sky_sat"), 1.35)
u_f(render3d_st, gpu_uniform(render3d_st, p, "u_fog_wall"), render3d_st.r3d_fog_wall)
u_f(render3d_st, gpu_uniform(render3d_st, p, "u_fog_inscatter"), render3d_st.r3d_fog_inscatter)
u_f(render3d_st, gpu_uniform(render3d_st, p, "u_time"), render3d_st.r3d_time)
mesh_draw(render3d_st, render3d_st.sky_fullscreen)
gpu_depth_write(render3d_st, true)
gpu_depth_func(render3d_st, GL_LESS)
}
# The end of the game's frame, whichever backend draws it: a screenshot first if one is wanted,
# then the present. A game calls these rather than Gl.swap / Gl.screenshot.
function r3d_screenshot(render3d_st: mut Render3dState, path: string) -> bool { return gpu_screenshot(render3d_st, path) }
function r3d_present(render3d_st: mut Render3dState) -> void { gpu_present(render3d_st) }
# the drawable changed size: the camera's aspect and every screen-sized target follow
# the GPU memory it makes is counted as VKM_TARGET (R3D_VKMEM)
function r3d_resize(render3d_st: mut Render3dState) -> void {
let was = render3d_st.gvk_tag
render3d_st.gvk_tag = VKM_TARGET
r3d_resize__t(render3d_st)
render3d_st.gvk_tag = was
}
function r3d_resize__t(render3d_st: mut Render3dState) -> void {
render3d_st.cam_aspect = float(gl_width()) / float(gl_height())
cam_update(render3d_st)
post_free(render3d_st)
post_init(render3d_st, gl_width(), gl_height())
if render3d_st.water_refl != null { target_free(render3d_st, render3d_st.water_refl); render3d_st.water_refl = null }
r3d_say_resized()
}
# the GPU memory it makes is counted as VKM_FRAME (R3D_VKMEM)
function r3d_frame(render3d_st: mut Render3dState, time: float) -> void {
let was = render3d_st.gvk_tag
render3d_st.gvk_tag = VKM_FRAME
r3d_frame__t(render3d_st, time)
render3d_st.gvk_tag = was
}
function r3d_frame__t(render3d_st: mut Render3dState, time: float) -> void {
outline_frame(render3d_st)
if not render3d_st.r3d_ready { return }
if gpu_resize_check(render3d_st) { r3d_resize(render3d_st) }
# R3D_RESIZE_AT=<frame>: rebuild every screen-sized buffer mid-run, as a window resize
# or a fullscreen change does. Headless has no window to resize, and this path is where
# a stale attachment or a texture freed twice shows up.
render3d_st.r3d_test_frame += 1
vkmem_tick(render3d_st)
tt_frame(render3d_st)
fog_at_tick(render3d_st)
if render3d_st.r3d_test_resize == 0 and r3d_env_has(render3d_st, "R3D_RESIZE_AT") { render3d_st.r3d_test_resize = Text.to_int(r3d_env(render3d_st, "R3D_RESIZE_AT")) }
# R3D_RESIZE_AT=<n>: from frame n on, rebuild every screen-sized buffer every few
# frames at a different size, as dragging a window edge or entering fullscreen does.
if render3d_st.r3d_test_resize > 0 and render3d_st.r3d_test_frame >= render3d_st.r3d_test_resize and render3d_st.r3d_test_frame % 4 == 0 {
let step = (render3d_st.r3d_test_frame / 4) % 4
var w = 1920; var h = 1080
if step == 1 { w = 1440; h = 810 }
if step == 2 { w = 2560; h = 1440 }
if step == 3 { w = 1281; h = 721 }
gl_set_drawable(w, h)
r3d_resize(render3d_st)
}
render3d_st.r3d_time = time
gsl_frame_start(render3d_st)
# the frame's counters close here, before any of its own work: the window each of them
# covers is exactly one frame, from this point to the same point next time
prof_gen_frame(render3d_st)
prof_mark_start(render3d_st)
cam_begin_frame(render3d_st, render3d_st.post_frame, gl_width(), gl_height())
# R3D_CAM_LOG=1: the camera each frame, in millimetres and thousandths of a radian - to tell a
# camera that moves while the hiker stands still from a picture that shakes on its own
if render3d_st.r3d_cam_log < 0 { render3d_st.r3d_cam_log = 0; if r3d_env_has(render3d_st, "R3D_CAM_LOG") { render3d_st.r3d_cam_log = 1 } }
if render3d_st.r3d_cam_log == 1 {
r3d_say_test_frame(render3d_st)
}
# the height-field shadow rebakes as the light moves in steps (daylight), or with the sky yaw when there is no clock
if not render3d_st.r3d_plate and ((not render3d_st.day_on and render3d_st.ter_shadow_yaw != render3d_st.sky_yaw) or render3d_st.ter_shadow_gen != render3d_st.day_gen) {
render3d_st.ter_shadow_gen = render3d_st.day_gen
let t_bk = gl_now_us()
terrain_bake_shadow(render3d_st)
prof_bake_add(render3d_st, gl_now_us() - t_bk)
}
scatter_begin_frame(render3d_st)
prof_cpu_mark(render3d_st, "shadow rebake")
stream_update_all(render3d_st)
prof_cpu_mark(render3d_st, "streaming")
gg_cull_frame(render3d_st) # before any pass: a dispatch inside one would split it
if not render3d_st.r3d_no_shadow { prof_begin(render3d_st, "shadow"); shadow_pass(render3d_st); prof_end(render3d_st) }
prof_cpu_mark(render3d_st, "shadow pass")
if render3d_st.water_on and not render3d_st.r3d_no_refl and water_reflect_visible(render3d_st) { prof_begin(render3d_st, "water reflection"); water_reflection_pass(render3d_st); prof_end(render3d_st) }
prof_cpu_mark(render3d_st, "reflection")
post_begin_scene(render3d_st)
# the near tree foliage lays its depth down before anything is shaded, so the terrain
# under the stands and the cards behind the front ones are rejected before lighting.
# It has to come straight after post_begin_scene: terrain_sun_prepare binds its own
# target, and depth drawn after it lands in the sun buffer, not the scene's.
if not r3d_prepass_off(render3d_st) {
prof_begin(render3d_st, "foliage prepass")
gpu_color_write(render3d_st, false)
scatter_draw_depth(render3d_st)
gpu_color_write(render3d_st, true)
prof_end(render3d_st)
render3d_st.sc_prepass = true
}
prof_cpu_mark(render3d_st, "foliage prepass")
if not render3d_st.r3d_plate {
prof_begin(render3d_st, "terrain sun")
terrain_sun_prepare(render3d_st)
prof_end(render3d_st)
prof_begin(render3d_st, "terrain")
terrain_draw(render3d_st)
prof_end(render3d_st)
}
prof_cpu_mark(render3d_st, "terrain")
prof_begin(render3d_st, "scene (vegetation)")
r3d_scene_draw(render3d_st)
prof_end(render3d_st)
render3d_st.sc_prepass = false
prof_cpu_mark(render3d_st, "vegetation")
prof_begin(render3d_st, "grass")
grass_draw(render3d_st)
prof_end(render3d_st)
prof_cpu_mark(render3d_st, "grass")
prof_begin(render3d_st, "sky")
r3d_draw_sky(render3d_st)
prof_end(render3d_st)
prof_begin(render3d_st, "resolve MSAA")
post_resolve(render3d_st)
prof_end(render3d_st)
# transparent water over the resolved frame: it tests against the frame's own
# depth and reads a copy of it for the depth tint and soft shores
if render3d_st.water_on {
prof_begin(render3d_st, "water surface")
post_capture_scene(render3d_st)
target_bind(render3d_st, render3d_st.post_hdr)
gpu_depth_test(render3d_st, true)
gpu_depth_func(render3d_st, GL_LESS)
water_draw(render3d_st, render3d_st.post_depth_copy.depth)
prof_end(render3d_st)
}
render3d_st.post_color = render3d_st.post_hdr.color; render3d_st.post_color_w = render3d_st.post_w; render3d_st.post_color_h = render3d_st.post_h
# DLSS super resolution: the lit frame up to the display's size, before anything reads it
if gsl_dlss_live(render3d_st) { prof_begin(render3d_st, "DLSS"); render3d_st.post_color = gsl_dlss_eval(render3d_st); prof_end(render3d_st) }
# Before bloom and before the tonemap: a shaft of light is a bright thing in the air and
# should bloom like one.
prof_begin(render3d_st, "volumetric"); post_volumetric_pass(render3d_st); prof_end(render3d_st)
prof_begin(render3d_st, "dof"); post_dof_pass(render3d_st); prof_end(render3d_st)
if not render3d_st.post_no_gi { prof_begin(render3d_st, "SSAO/GI"); post_ssao_pass(render3d_st); prof_end(render3d_st) }
if render3d_st.r3d_debug_max { tex_max(render3d_st, render3d_st.post_hdr.color, render3d_st.post_hdr.w, render3d_st.post_hdr.h, "hdr") }
prof_begin(render3d_st, "bloom")
post_bloom_pass(render3d_st)
prof_end(render3d_st)
prof_begin(render3d_st, "tonemap+exposure")
post_tonemap(render3d_st, render3d_st.post_color)
prof_end(render3d_st)
prof_cpu_mark(render3d_st, "post")
prof_begin(render3d_st, "prev-colour copy")
post_capture_prev(render3d_st)
prof_end(render3d_st)
prof_collect(render3d_st)
gpu_check(render3d_st, "frame")
}
# messages, each built in a function of its own so the path that says it holds no allocation
@alloc_ok("a message, built only when it is said: a failure, a warning or a debug switch")
function r3d_say_resized() -> void { print(`r3d: resized to {gl_width()}x{gl_height()}`) }
@alloc_ok("a message, built only when it is said: a failure, a warning or a debug switch")
function r3d_say_test_frame(render3d_st: Render3dState) -> void { print(`cam {render3d_st.r3d_test_frame} pos {int(render3d_st.cam_pos[0] * 1000.0)} {int(render3d_st.cam_pos[1] * 1000.0)} {int(render3d_st.cam_pos[2] * 1000.0)} yaw {int(render3d_st.cam_yaw * 1000.0)} pitch {int(render3d_st.cam_pitch * 1000.0)} jitter {int(render3d_st.gsl_jitter_x * 1000000.0)} {int(render3d_st.gsl_jitter_y * 1000000.0)} render {render3d_st.post_w}x{render3d_st.post_h} reset {render3d_st.gsl_reset} evalok {render3d_st.gsl_eval_ok} fresh {render3d_st.gsl_fresh}`) }
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