118 lines
3.2 KiB
Lua
118 lines
3.2 KiB
Lua
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local stb = require("stb")
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local ffi = require("ffi")
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local nk = sg
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-- A magic cache pool of loaded pngs. Storing filename to data
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local images_loaded = {}
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-- returns struct nk_image
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local function image_load(filename)
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local x = ffi.new("int[1]", {0})
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local y = ffi.new("int[1]", {0})
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local n = ffi.new("int[1]", {4})
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local data = stb.stbi_load(filename, x, y, nil, 4)
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if (data == nil) then error("[STB]: failed to load image: "..filename); end
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print("Image Loaded: "..filename.." Width: "..x[0].." Height: "..y[0].." Channels: "..n[0])
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local pixformat = sg.SG_PIXELFORMAT_RGBA8
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local sg_img_desc = ffi.new("sg_image_desc[1]")
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sg_img_desc[0].width = x[0]
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sg_img_desc[0].height = y[0]
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sg_img_desc[0].pixel_format = pixformat
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sg_img_desc[0].sample_count = 1
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sg_img_desc[0].data.subimage[0][0].ptr = data
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sg_img_desc[0].data.subimage[0][0].size = x[0] * y[0] * n[0]
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local new_img = sg.sg_make_image(sg_img_desc)
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-- // create a sokol-nuklear image object which associates an sg_image with an sg_sampler
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local img_desc = ffi.new("snk_image_desc_t[1]")
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img_desc[0].image = new_img
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local snk_img = nk.snk_make_image(img_desc)
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local nk_hnd = nk.snk_nkhandle(snk_img)
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local nk_img = nk.nk_image_handle(nk_hnd);
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return nk_img
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end
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----------------------------
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local function image_create( buffer, width, height, channels )
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channels = channels or 4
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local x = ffi.new("int[1]", {width})
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local y = ffi.new("int[1]", {height})
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local n = ffi.new("int[1]", {channels})
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local data = ffi.new("unsigned char[?]", width * height * channels)
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ffi.copy(data, ffi.cast("unsigned char *",buffer), width * height * channels)
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local pixformat = sg.SG_PIXELFORMAT_RGBA8
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if(channels == 1) then
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pixformat = sg.SG_PIXELFORMAT_R8
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elseif(channels == 2) then
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pixformat = sg.SG_PIXELFORMAT_RG8
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end
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local sg_img_desc = ffi.new("sg_image_desc[1]")
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sg_img_desc[0].width = x[0]
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sg_img_desc[0].height = y[0]
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sg_img_desc[0].pixel_format = pixformat
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sg_img_desc[0].sample_count = 1
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sg_img_desc[0].data.subimage[0][0].ptr = data
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sg_img_desc[0].data.subimage[0][0].size = x[0] * y[0] * channels
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local new_img = sg.sg_make_image(sg_img_desc)
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-- // create a sokol-nuklear image object which associates an sg_image with an sg_sampler
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local img_desc = ffi.new("snk_image_desc_t[1]")
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img_desc[0].image = new_img
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local snk_img = nk.snk_make_image(img_desc)
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local nk_hnd = nk.snk_nkhandle(snk_img)
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local nk_img = nk.nk_image_handle(nk_hnd);
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return snk_img, nk_hnd, data
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end
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----------------------------
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local function load(filename)
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local imgid = image_load(filename)
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images_loaded[filename] =imgid
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return imgid
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end
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----------------------------
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local function loadbuffer(filename)
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local imgid = image_load(filename)
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images_loaded[filename] =imgid
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return imgid
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end
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----------------------------
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local function getimage(filename)
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return images_loaded[filename]
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end
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----------------------------
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return {
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load = load,
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loadbuffer = loadbuffer,
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getimage = getimage,
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image_load = image_load,
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image_create = image_create,
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}
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----------------------------
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