use cobra

cmd/root.go

@@ -0,0 +1,120 @@
+/*
+Copyright © 2024 filifa
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+package cmd
+
+/*
+#cgo CFLAGS: -I/home/nick/Downloads/include
+#cgo LDFLAGS: -L/home/nick/.local/lib -lprojectM-4
+#include "projectM-4/projectM.h"
+*/
+import "C"
+
+import (
+	"os"
+
+	"github.com/spf13/cobra"
+	"github.com/veandco/go-sdl2/sdl"
+)
+
+var preset string
+
+func handleWindowEvent(event *sdl.WindowEvent, m *milkDropWindow) {
+	switch event.Event {
+	case sdl.WINDOWEVENT_RESIZED:
+		w, h := event.Data1, event.Data2
+		C.projectm_set_window_size(m.handle, C.ulong(w), C.ulong(h))
+	}
+}
+
+func handleEvent(event sdl.Event, m *milkDropWindow) bool {
+	switch event.(type) {
+	case *sdl.QuitEvent:
+		return false
+	case *sdl.WindowEvent:
+		event := event.(*sdl.WindowEvent)
+		handleWindowEvent(event, m)
+	}
+
+	return true
+}
+
+func milkbucket(cmd *cobra.Command, args []string) {
+	err := sdl.Init(sdl.INIT_VIDEO)
+	if err != nil {
+		panic(err)
+	}
+	defer sdl.Quit()
+
+	m, err := newMilkDropWindow(800, 600)
+	if err != nil {
+		panic(err)
+	}
+	defer m.destroy()
+
+	m.loadPreset(preset)
+
+	running := true
+	for running {
+		for event := sdl.PollEvent(); event != nil; event = sdl.PollEvent() {
+			running = handleEvent(event, m)
+			if !running {
+				break
+			}
+		}
+
+		if !running {
+			break
+		}
+
+		running, err = m.render()
+		if err != nil {
+			panic(err)
+		}
+	}
+}
+
+// rootCmd represents the base command when called without any subcommands
+var rootCmd = &cobra.Command{
+	Use:   "milkbucket",
+	Short: "A brief description of your application",
+	Long: `A longer description that spans multiple lines and likely contains
+examples and usage of using your application. For example:
+
+Cobra is a CLI library for Go that empowers applications.
+This application is a tool to generate the needed files
+to quickly create a Cobra application.`,
+	Run: milkbucket,
+}
+
+// Execute adds all child commands to the root command and sets flags appropriately.
+// This is called by main.main(). It only needs to happen once to the rootCmd.
+func Execute() {
+	err := rootCmd.Execute()
+	if err != nil {
+		os.Exit(1)
+	}
+}
+
+func init() {
+	// Here you will define your flags and configuration settings.
+	// Cobra supports persistent flags, which, if defined here,
+	// will be global for your application.
+
+	// Cobra also supports local flags, which will only run
+	// when this action is called directly.
+	rootCmd.Flags().StringVarP(&preset, "preset", "p", "", "Preset file to use")
+}

cmd/window.go

@@ -0,0 +1,79 @@
+package cmd
+
+/*
+#include "projectM-4/projectM.h"
+#include <stdlib.h>
+*/
+import "C"
+
+import (
+	"encoding/binary"
+	"errors"
+	"io"
+	"os"
+	"unsafe"
+
+	"github.com/veandco/go-sdl2/sdl"
+)
+
+const bufSize uint = 2048
+
+type milkDropWindow struct {
+	window  *sdl.Window
+	context sdl.GLContext
+	handle  C.projectm_handle
+}
+
+func newMilkDropWindow(width, height int32) (*milkDropWindow, error) {
+	var m milkDropWindow
+	var err error
+
+	m.window, err = sdl.CreateWindow("milkbucket", sdl.WINDOWPOS_UNDEFINED, sdl.WINDOWPOS_UNDEFINED, width, height, sdl.WINDOW_OPENGL|sdl.WINDOW_RESIZABLE)
+	if err != nil {
+		return &m, err
+	}
+
+	m.context, err = m.window.GLCreateContext()
+	if err != nil {
+		return &m, err
+	}
+
+	m.handle = C.projectm_create()
+	if m.handle == nil {
+		return &m, errors.New("error creating projectM instance")
+	}
+
+	C.projectm_set_window_size(m.handle, C.ulong(width), C.ulong(height))
+
+	return &m, nil
+}
+
+func (m *milkDropWindow) destroy() {
+	C.projectm_destroy(m.handle)
+	sdl.GLDeleteContext(m.context)
+	m.window.Destroy()
+}
+
+func (m *milkDropWindow) loadPreset(preset string) {
+	cPreset := C.CString(preset)
+	defer C.free(unsafe.Pointer(cPreset))
+	C.projectm_load_preset_file(m.handle, cPreset, false)
+}
+
+func (m *milkDropWindow) render() (bool, error) {
+	var audioData [bufSize]int16
+
+	err := binary.Read(os.Stdin, binary.LittleEndian, &audioData)
+	if err == io.ErrUnexpectedEOF {
+		return false, nil
+	} else if err != nil {
+		return true, err
+	}
+
+	C.projectm_pcm_add_int16(m.handle, (*C.int16_t)(&audioData[0]), C.uint(bufSize), C.PROJECTM_STEREO)
+
+	C.projectm_opengl_render_frame(m.handle)
+	m.window.GLSwap()
+
+	return true, nil
+}