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refactor(render3d): vertex data and draws behind gpu.ludic

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Every vertex array, vertex and index buffer, attribute pointer, instance divisor, stream
upload and draw call now goes through gpu_mesh_* / gpu_buffer_* / gpu_draw_*, and no other
file in the package names them. A Mesh records its layout as it is built - which buffer
feeds which attribute at what stride and offset, per vertex or per instance - so a backend
that bakes vertex input into a pipeline can read it back. On OpenGL each call is the GL it
replaces, in the same order: the five fixed viewpoints render bit-identically and the game's
self-tests report exactly what they did before.

scatter_attach takes the mesh rather than its vertex array; a mesh now frees every vertex
buffer it owns (glTF meshes used to keep all but the first); the two helpers nothing called,
mesh_grid_patches and mesh_instance_buffer, are gone.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-15 10:21:55 +03:00
parent 3fb1b7cd87
commit 43c379aa0f
8 changed files with 271 additions and 267 deletions
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23
packages/ludic.render3d/terrain.ludic
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@ -544,7 +544,7 @@ function terrain_sun_pass(w: int, h: int, depth: int) -> Target {
shadow_bind(p)
sky_bind_lighting(p)
ter_sun_pass = true
gl_bind_vertex_array(cd_mesh.vao)
gpu_mesh_bind(cd_mesh)
cdlod_select(CD_LEVELS - 1, 0, 0)
ter_sun_pass = false
if Os.has_env("R3D_DUMP_SUN") and not ter_sun_dumped and not ter_reflect { ter_sun_dumped = true; tex_dump(t.color, w, h, "build/dbg_sun.ppm") }
@ -587,7 +587,7 @@ function terrain_draw() -> void {
cd_draws = 0
cd_far_draws = 0
cd_near_draws = 0
gl_bind_vertex_array(cd_mesh.vao)
gpu_mesh_bind(cd_mesh)
if ter_wire { gl_polygon_mode(GL_FRONT_AND_BACK, GL_LINE) }
cdlod_select(CD_LEVELS - 1, 0, 0)
if ter_wire { gl_polygon_mode(GL_FRONT_AND_BACK, GL_FILL) }
@ -602,16 +602,13 @@ var ter_printed: bool = false
# shader places, scales and morphs it. Levels are drawn out to cd_range[k] = 48 * 2^k m,
# so cells are 1 m within 48 m, 2 m to 96 m, 4 m to 192 m ... 256 m at the root.
function cdlod_init() -> void {
let m = new Mesh
m.vao = gl_vao()
let m = gpu_mesh_new()
let n = CD_G + 1
let v = gl_floats(n * n * 2)
var k = 0
for j in 0 .. n { for i in 0 .. n { gl_put_bits(v, k, fr(i, CD_G)); gl_put_bits(v, k + 1, fr(j, CD_G)); k += 2 } }
m.vbo = gl_buffer()
gl_bind_buffer(GL_ARRAY_BUFFER, m.vbo)
gl_buffer_data(GL_ARRAY_BUFFER, gl_bytes_of(n * n * 2), v, GL_STATIC_DRAW)
gl_enable_vertex_attrib_array(0); gl_vertex_attrib_pointer(0, 2, GL_FLOAT, 0, 8, null)
gpu_mesh_vertices(m, v, gl_bytes_of(n * n * 2), GPU_STATIC)
gpu_mesh_attr(m, 0, 2, GPU_F32, 8, 0, false)
free(v)
let ni = CD_G * CD_G * 6
let idx = words(ni)
@ -624,12 +621,10 @@ function cdlod_init() -> void {
k += 6
}
}
m.ebo = gl_buffer()
gl_bind_buffer(GL_ELEMENT_ARRAY_BUFFER, m.ebo)
gl_buffer_data(GL_ELEMENT_ARRAY_BUFFER, ni * 4, idx, GL_STATIC_DRAW)
gpu_mesh_indices(m, idx, ni * 4, 4)
free(idx)
m.count = ni
gl_bind_vertex_array(0)
gpu_mesh_done(m)
cd_mesh = m
cd_range = words(CD_LEVELS)
var r = fi(48)
@ -713,7 +708,7 @@ function cdlod_draw(level: int, ix: int, iz: int) -> void {
var st0 = F_ZERO
if level > 0 { st0 = cd_range[level - 1] }
u_f2(gpu_uniform(ter_sun_prog, "u_morph"), f_lerp(st0, cd_range[level], fl(0.7)), cd_range[level])
gl_draw_elements(GL_TRIANGLES, cd_mesh.count, GL_UNSIGNED_INT, null)
gpu_draw_bound_elements(cd_mesh)
return
}
let n = CD_LEAVES >> level
@ -735,7 +730,7 @@ function cdlod_draw(level: int, ix: int, iz: int) -> void {
if level > 0 { start = cd_range[level - 1] }
start = f_lerp(start, cd_range[level], fl(0.7))
u_f2(gpu_uniform(p, "u_morph"), start, cd_range[level])
gl_draw_elements(GL_TRIANGLES, cd_mesh.count, GL_UNSIGNED_INT, null)
gpu_draw_bound_elements(cd_mesh)
cd_draws += 1
}