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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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20
packages/ludic.render3d/gltf.ludic
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@ -123,20 +123,15 @@ function gltf_accessor(idx: int) -> pointer {
function gltf_attrib(m: Mesh, attrs: Val, name: pointer, loc: int) -> bool {
if value_has(attrs, name) == 0 { return false }
let data = gltf_accessor(value_as_int(value_get(attrs, name)))
let b = gl_buffer()
gl_bind_buffer(GL_ARRAY_BUFFER, b)
gl_buffer_data(GL_ARRAY_BUFFER, gltf_count * gltf_comps * 4, data, GL_STATIC_DRAW)
gl_enable_vertex_attrib_array(loc)
gl_vertex_attrib_pointer(loc, gltf_comps, GL_FLOAT, 0, 0, null)
gpu_mesh_vertices(m, data, gltf_count * gltf_comps * 4, GPU_STATIC)
gpu_mesh_attr(m, loc, gltf_comps, GPU_F32, 0, 0, false)
free(data)
if loc == 0 { m.vbo = b }
return true
}
function gltf_prim(p: Val) -> Prim {
let pr = new Prim
let m = new Mesh
m.vao = gl_vao()
let m = gpu_mesh_new()
let attrs = value_get(p, "attributes")
gltf_attrib(m, attrs, "POSITION", 0)
gltf_attrib(m, attrs, "NORMAL", 1)
@ -144,14 +139,11 @@ function gltf_prim(p: Val) -> Prim {
skin_attribs(m, attrs) # JOINTS_0 / WEIGHTS_0 onto 5 / 6, when the mesh has them
let idx = gltf_accessor(value_as_int(value_get(p, "indices")))
var isz = 4
m.itype = GL_UNSIGNED_INT
if gltf_ctype == 5123 { isz = 2; m.itype = GL_UNSIGNED_SHORT }
m.ebo = gl_buffer()
gl_bind_buffer(GL_ELEMENT_ARRAY_BUFFER, m.ebo)
gl_buffer_data(GL_ELEMENT_ARRAY_BUFFER, gltf_count * isz, idx, GL_STATIC_DRAW)
if gltf_ctype == 5123 { isz = 2 }
gpu_mesh_indices(m, idx, gltf_count * isz, isz)
free(idx)
m.count = gltf_count
gl_bind_vertex_array(0)
gpu_mesh_done(m)
pr.mesh = m
# material textures
if gltf_white == 0 { gltf_white = tex_solid(200, 200, 200, 255); gltf_flat = tex_solid(128, 128, 255, 255) }