mirror of
https://github.com/pound-emu/ballistic.git
synced 2026-06-17 04:16:48 -07:00
Ronald Caesar
5f0791e8b1
This adds luajit-imgui without submodules. Signed-off-by: Ronald Caesar <github43132@proton.me>
122 lines
3.6 KiB
Lua
122 lines
3.6 KiB
Lua
local ffi = require"ffi"
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--from https://github.com/sonoro1234/LuaJIT-SDL2
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local sdl = require"sdl2_ffi"
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--just to get gl functions
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-- from https://github.com/sonoro1234/LuaJIT-GLFW
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local gllib = require"gl"
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gllib.set_loader(sdl)
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local gl, glc, glu, glext = gllib.libraries()
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local ig = require"imgui.sdl"
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if (sdl.init(sdl.INIT_AUDIO+sdl.INIT_VIDEO+sdl.INIT_TIMER) ~= 0) then
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print(string.format("Error: %s\n", sdl.getError()));
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return -1;
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end
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-----audio stuff
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local sampleHz = 48000
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local function MyAudioCallback()
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local ffi = require"ffi"
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local sin = math.sin
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return function(ud,stream,len)
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local buf = ffi.cast("float*",stream)
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local udc = ffi.cast("struct {double Phase;double dPhase;}*",ud)
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local lenf = len/ffi.sizeof"float"
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for i=0,lenf-2,2 do
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local sample = sin(udc.Phase)*0.05
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udc.Phase = udc.Phase + udc.dPhase
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buf[i] = sample
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buf[i+1] = sample
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end
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end
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end
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local ud = ffi.new"struct {double Phase;double dPhase;}"
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local freqval = ffi.new("float[1]",100)
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local function setFreq(ff)
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sdl.LockAudio() -- not really needed
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ud.dPhase = 2 * math.pi * ff / sampleHz
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sdl.UnlockAudio()
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end
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setFreq(freqval[0])
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local want = ffi.new"SDL_AudioSpec[1]"
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local have = ffi.new"SDL_AudioSpec[1]"
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want[0].freq = sampleHz;
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want[0].format = sdl.AUDIO_F32;
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want[0].channels = 2;
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want[0].samples = 4096;
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want[0].callback = sdl.MakeAudioCallback(MyAudioCallback)
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want[0].userdata = ud
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local dev = sdl.openAudioDevice(devwanted, 0, want, have, 0)
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if (dev == 0) then
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sdl.log("Failed to open audio: %s", sdl.GetError());
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error"failed to open audio"
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else
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sdl.PauseAudioDevice(dev, 0); -- start audio playing.
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end
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------------
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sdl.gL_SetAttribute(sdl.GL_CONTEXT_FLAGS, sdl.GL_CONTEXT_FORWARD_COMPATIBLE_FLAG);
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sdl.gL_SetAttribute(sdl.GL_CONTEXT_PROFILE_MASK, sdl.GL_CONTEXT_PROFILE_CORE);
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sdl.gL_SetAttribute(sdl.GL_DOUBLEBUFFER, 1);
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sdl.gL_SetAttribute(sdl.GL_DEPTH_SIZE, 24);
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sdl.gL_SetAttribute(sdl.GL_STENCIL_SIZE, 8);
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sdl.gL_SetAttribute(sdl.GL_CONTEXT_MAJOR_VERSION, 3);
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sdl.gL_SetAttribute(sdl.GL_CONTEXT_MINOR_VERSION, 2);
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local current = ffi.new("SDL_DisplayMode[1]")
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sdl.getCurrentDisplayMode(0, current);
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local window = sdl.createWindow("ImGui SDL2+OpenGL3 example", sdl.WINDOWPOS_CENTERED, sdl.WINDOWPOS_CENTERED, 700, 500, sdl.WINDOW_OPENGL+sdl.WINDOW_RESIZABLE);
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local gl_context = sdl.gL_CreateContext(window);
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sdl.gL_SetSwapInterval(1); -- Enable vsync
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local ig_Impl = ig.Imgui_Impl_SDL_opengl3()
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ig_Impl:Init(window, gl_context)
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local igio = ig.GetIO()
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local done = false;
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while (not done) do
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--SDL_Event
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local event = ffi.new"SDL_Event"
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while (sdl.pollEvent(event) ~=0) do
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ig.lib.ImGui_ImplSDL2_ProcessEvent(event);
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if (event.type == sdl.QUIT) then
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done = true;
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end
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if (event.type == sdl.WINDOWEVENT and event.window.event == sdl.WINDOWEVENT_CLOSE and event.window.windowID == sdl.getWindowID(window)) then
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done = true;
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end
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end
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--standard rendering
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sdl.gL_MakeCurrent(window, gl_context);
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gl.glViewport(0, 0, igio.DisplaySize.x, igio.DisplaySize.y);
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gl.glClear(glc.GL_COLOR_BUFFER_BIT)
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ig_Impl:NewFrame()
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if ig.SliderFloat("frequency",freqval,100,2000) then
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setFreq(freqval[0])
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end
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ig.ShowDemoWindow(showdemo)
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ig_Impl:Render()
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sdl.gL_SwapWindow(window);
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end
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-- Cleanup
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sdl.PauseAudioDevice(dev, 1)
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sdl.CloseAudioDevice(dev);
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ig_Impl:destroy()
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sdl.gL_DeleteContext(gl_context);
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sdl.destroyWindow(window);
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sdl.quit();
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