scripts/index-test/page.lua (excerpt)

local vertices = {}
-- Create a 101*101 grid of vertices covering a [-1;1]x[-1;1] rectangle
for x = 0, 100 do
    for y = 0, 100 do
        vertices[x*101+y] = types.vertex(
            x/50-1, y/50-1, 0,
            x/100, y/100,
            0, 0,
            argb8(x/100, y/100, 0, 1))
    end
end

local indices = {}
-- Define a triangle list to fill the rectangle
do
    local index = 0
    for x = 0, 99 do
        for y = 0, 99 do
            indices[index] = x*101+y
            indices[index+1] = (x+1)*101+y
            indices[index+2] = (x+1)*101+(y+1)
            indices[index+3] = x*101+y
            indices[index+4] = (x+1)*101+(y+1)
            indices[index+5] = x*101+(y+1)
            index = index + 6
        end
    end
end

-- Sends the vertex+index data to a MeshData object
local function initmeshdata(meshdata)
    -- Call trylockback until success
    local mb = meshdata:lock()
    -- Create a DataBuffer object with sizeof(Vertex) * vertexcount bytes of data payload, the same amount of memory allocated and without a source buffer
    local vdb = databuffer:create(ffi.sizeof(types.vertex) * (#vertices+1), ffi.sizeof(types.vertex) * (#vertices+1), nil)
    -- Casts void* of the buffer to Vertex*
    local vptr = ffi.cast(types.pvertex, vdb:getdata())
    for i = 0, #vertices do
        vptr[i] = vertices[i]
    end
    mb:setvertexdata(vdb)
    local idb = databuffer:create(2 * (#indices+1), 2 * (#indices+1), nil)
    local iptr = ffi.cast('uint16_t*', idb:getdata())
    for i = 0, #indices do
        iptr[i] = indices[i]
    end
    mb:setindexdata(idb)
    -- Unlock the buffer and swap them immediately
    mb:release()
end