blockyserver/internal/render/gif.go
2026-01-22 16:26:39 +06:00

63 lines
1.5 KiB
Go

package render
import (
"bytes"
"fmt"
"image"
"image/color/palette"
"image/draw"
"image/gif"
"github.com/hytale-tools/blockymodel-merger/pkg/texture"
)
// RenderGIF renders a GLB model to an animated GIF rotating 360 degrees
func RenderGIF(glbBytes []byte, atlas *texture.Atlas, background string, frames, width, height, delay int) ([]byte, error) {
// Parse background color
bgColor, err := ParseHexColor(background)
if err != nil {
return nil, fmt.Errorf("invalid background color: %w", err)
}
// Get atlas image
var atlasImage = atlas.Image
// Convert GLB to mesh
mesh, err := GLBToMesh(glbBytes, atlasImage)
if err != nil {
return nil, fmt.Errorf("converting GLB to mesh: %w", err)
}
// Calculate rotation per frame
rotationPerFrame := 360.0 / float64(frames)
// Create GIF structure
g := &gif.GIF{
Image: make([]*image.Paletted, frames),
Delay: make([]int, frames),
LoopCount: 0, // 0 = infinite loop
}
// Render each frame
for i := 0; i < frames; i++ {
rotation := float64(i) * rotationPerFrame
// Render frame
img := RenderScene(mesh, atlasImage, rotation, width, height, bgColor)
// Quantize to palette
paletted := image.NewPaletted(img.Bounds(), palette.Plan9)
draw.FloydSteinberg.Draw(paletted, img.Bounds(), img, image.Point{})
g.Image[i] = paletted
g.Delay[i] = delay
}
// Encode GIF
var buf bytes.Buffer
if err := gif.EncodeAll(&buf, g); err != nil {
return nil, fmt.Errorf("encoding GIF: %w", err)
}
return buf.Bytes(), nil
}