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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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26
packages/ludic.render3d/overlay.ludic
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@ -12,7 +12,7 @@ const OV_MAX_QUADS: int = 6000
const OV_FLOATS: int = 8 # x, y, u, v, r, g, b, a
var ov_prog: int = 0
var ov_vao: int = 0
var ov_mesh: Mesh = null
var ov_vbo: int = 0
var ov_buf: pointer = null
var ov_n: int = 0
@ -55,15 +55,12 @@ function overlay_init(font_dir: string) -> bool {
r3d_program_log("overlay.vert", "overlay.frag", "")
ov_prog = gl_program("#version 410 core\n" + r3d_shader_file("overlay.vert"), "#version 410 core\n" + r3d_shader_file("overlay.frag"))
if ov_prog == 0 { print("overlay: program failed"); return false }
ov_vao = gl_vao()
gl_bind_vertex_array(ov_vao)
ov_vbo = gl_buffer()
gl_bind_buffer(GL_ARRAY_BUFFER, ov_vbo)
gl_buffer_data(GL_ARRAY_BUFFER, gl_bytes_of(OV_MAX_QUADS * 6 * OV_FLOATS), null, GL_DYNAMIC_DRAW)
gl_enable_vertex_attrib_array(0); gl_vertex_attrib_pointer(0, 2, GL_FLOAT, 0, OV_FLOATS * 4, null)
gl_enable_vertex_attrib_array(1); gl_vertex_attrib_pointer(1, 2, GL_FLOAT, 0, OV_FLOATS * 4, gl_ptr(null, 8))
gl_enable_vertex_attrib_array(2); gl_vertex_attrib_pointer(2, 4, GL_FLOAT, 0, OV_FLOATS * 4, gl_ptr(null, 16))
gl_bind_vertex_array(0)
ov_mesh = gpu_mesh_new()
ov_vbo = gpu_mesh_vertices(ov_mesh, null, gl_bytes_of(OV_MAX_QUADS * 6 * OV_FLOATS), GPU_DYNAMIC)
gpu_mesh_attr(ov_mesh, 0, 2, GPU_F32, OV_FLOATS * 4, 0, false)
gpu_mesh_attr(ov_mesh, 1, 2, GPU_F32, OV_FLOATS * 4, 8, false)
gpu_mesh_attr(ov_mesh, 2, 4, GPU_F32, OV_FLOATS * 4, 16, false)
gpu_mesh_done(ov_mesh)
ov_buf = gl_floats(OV_MAX_QUADS * 6 * OV_FLOATS)
ov_ranges = words(OV_MAX_RANGES * OV_RANGE_W)
ov_white = tex_solid(255, 255, 255, 255)
@ -193,9 +190,8 @@ function ov_flush() -> void {
ov_close_range()
if ov_n == 0 { ov_nr = 0; ov_range_start = 0; return }
gl_use_program(ov_prog)
gl_bind_vertex_array(ov_vao)
gl_bind_buffer(GL_ARRAY_BUFFER, ov_vbo)
gl_buffer_data(GL_ARRAY_BUFFER, gl_bytes_of(ov_n * 6 * OV_FLOATS), ov_buf, GL_STREAM_DRAW)
gpu_mesh_bind(ov_mesh)
gpu_buffer_upload(ov_vbo, gl_bytes_of(ov_n * 6 * OV_FLOATS), ov_buf, GPU_STREAM)
var last = -1
var clipped = false
for i in 0 .. ov_nr {
@ -212,10 +208,10 @@ function ov_flush() -> void {
clipped = true
gpu_scissor(ov_ranges[o + 3], ov_ranges[o + 4], ov_ranges[o + 5], ov_ranges[o + 6])
} else if clipped { gpu_scissor_off(); clipped = false }
gl_draw_arrays(GL_TRIANGLES, ov_ranges[o + 1] * 6, ov_ranges[o + 2] * 6)
gpu_draw_range(ov_mesh, ov_ranges[o + 1] * 6, ov_ranges[o + 2] * 6)
}
if clipped { gpu_scissor_off() }
gl_bind_vertex_array(0)
gpu_mesh_unbind()
ov_n = 0; ov_nr = 0; ov_range_start = 0
}
function ov_end() -> void {