151 lines
3.2 KiB
Go
151 lines
3.2 KiB
Go
/*
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Copyright © 2024 filifa
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package cmd
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/*
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#cgo LDFLAGS: -lprojectM-4
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#include "projectM-4/projectM.h"
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#include <stdlib.h>
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*/
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import "C"
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import (
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"container/ring"
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"encoding/binary"
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"encoding/json"
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"errors"
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"io"
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"os"
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"unsafe"
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"github.com/veandco/go-sdl2/sdl"
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)
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const bufSize uint = 2048
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type milkDropWindow struct {
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window *sdl.Window
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context sdl.GLContext
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handle C.projectm_handle
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preset *ring.Ring
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}
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type script struct {
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Presets []string
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Times []float64
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}
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func readScript(scriptPath string) (*script, error) {
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if scriptPath == "" {
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return nil, errors.New("no script given")
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}
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f, err := os.Open(scriptPath)
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if err != nil {
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return nil, err
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}
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defer f.Close()
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data, err := io.ReadAll(f)
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if err != nil {
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return nil, err
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}
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var s script
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err = json.Unmarshal(data, &s)
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return &s, err
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}
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func (m *milkDropWindow) nextPreset() {
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m.preset = m.preset.Next()
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m.loadPreset(m.preset.Value.(string))
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}
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func (m *milkDropWindow) prevPreset() {
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m.preset = m.preset.Prev()
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m.loadPreset(m.preset.Value.(string))
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}
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func newMilkDropWindow(width, height int32, scriptPath string) (*milkDropWindow, error) {
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var m milkDropWindow
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var err error
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s, err := readScript(scriptPath)
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if err != nil {
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return nil, err
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}
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m.preset = ring.New(len(s.Presets))
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for _, preset := range s.Presets {
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m.preset.Value = preset
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m.preset = m.preset.Next()
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}
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m.window, err = sdl.CreateWindow("milkbucket", sdl.WINDOWPOS_UNDEFINED, sdl.WINDOWPOS_UNDEFINED, width, height, sdl.WINDOW_OPENGL|sdl.WINDOW_RESIZABLE)
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if err != nil {
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return &m, err
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}
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m.context, err = m.window.GLCreateContext()
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if err != nil {
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return &m, err
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}
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m.handle = C.projectm_create()
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if m.handle == nil {
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return &m, errors.New("error creating projectM instance")
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}
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C.projectm_set_window_size(m.handle, C.ulong(width), C.ulong(height))
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return &m, nil
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}
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func (m *milkDropWindow) destroy() {
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C.projectm_destroy(m.handle)
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sdl.GLDeleteContext(m.context)
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m.window.Destroy()
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}
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func (m *milkDropWindow) loadPreset(preset string) {
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cPreset := C.CString(preset)
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defer C.free(unsafe.Pointer(cPreset))
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C.projectm_load_preset_file(m.handle, cPreset, true)
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}
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func (m *milkDropWindow) render() (bool, error) {
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var audioData [bufSize]int16
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err := binary.Read(os.Stdin, binary.LittleEndian, &audioData)
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if err == io.ErrUnexpectedEOF {
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return false, nil
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} else if err != nil {
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return true, err
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}
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C.projectm_pcm_add_int16(m.handle, (*C.int16_t)(&audioData[0]), C.uint(bufSize), C.PROJECTM_STEREO)
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C.projectm_opengl_render_frame(m.handle)
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m.window.GLSwap()
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return true, nil
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}
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func (m *milkDropWindow) resize(w, h int32) {
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C.projectm_set_window_size(m.handle, C.ulong(w), C.ulong(h))
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}
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