zorldo

commit 9e499efa47b8b2ce1634f4a61dbd78716390077e
parent e59ae6596780d1c575d0d33d1903605041c5bfb7
Author: bsandro <brian.drosan@gmail.com>
Date:   Sun,  3 Oct 2021 05:14:34 +0300

find first tileset gid for render

Diffstat:
M
main.go
 | 
56
+++++++++++++++++++++++++++++++-------------------------

1 file changed, 31 insertions(+), 25 deletions(-)
diff --git a/main.go b/main.go
@@ -8,35 +8,36 @@ import (
 	"image"
 	_ "image/png"
 	"log"
-	"os"
 	_ "math"
+	"os"
 )
 
 const (
-	flipHoriz uint32 = 0b10000000000000000000000000000000
-	flipVert uint32  = 0b01000000000000000000000000000000
-	flipDiag uint32  = 0b00100000000000000000000000000000
-	screenW    = 1024
-	screenH    = 768
-	tileSize   = 16
-	tileXCount = 40
+	flipHoriz  uint32 = 0b10000000000000000000000000000000
+	flipVert   uint32 = 0b01000000000000000000000000000000
+	flipDiag   uint32 = 0b00100000000000000000000000000000
+	screenW           = 1024
+	screenH           = 768
+	tileSize          = 16
+	tileXCount        = 40
 )
 
 type Gamemap struct {
 	Height int `json:height`
 	Width  int `json:width`
 	Layers []struct {
-		Type   string `json:type`
-		Id     int    `json:id`
+		Type   string   `json:type`
+		Id     int      `json:id`
 		Data   []uint32 `json:data`
-		Height int    `json:height`
-		Width  int    `json:width`
-		X      int    `json:x`
-		Y      int    `json:y`
+		Height int      `json:height`
+		Width  int      `json:width`
+		X      int      `json:x`
+		Y      int      `json:y`
 	} `json:layers`
 	Tilesets []struct {
-		Firstgid uint   `json:firstgid`
+		Firstgid uint32 `json:firstgid`
 		Source   string `json:source`
+		Name     string `json:name`
 	} `json:tilesets`
 }
 
@@ -64,33 +65,38 @@ func init() {
 	}
 }
 
+func findFirstGid(gid uint32) uint32 {
+	var ret uint32 = 0
+	for _, tileset := range gamemap.Tilesets {
+		if gid >= tileset.Firstgid && ret < tileset.Firstgid {
+			ret = tileset.Firstgid
+		}
+	}
+	return ret
+}
+
 func (g *Game) Update() error {
 	return nil
 }
 
 func (g *Game) Draw(screen *ebiten.Image) {
-	fmt.Println("------------------------------------------------------------------------------------------------------")
-
 	for _, layer := range gamemap.Layers {
 		if layer.Type == "tilelayer" {
 			for i, t := range layer.Data {
 				if t > 0 {
-					t_orig := t
 					is_flipped_hor := (t & flipHoriz) >> 31
 					is_flipped_ver := (t & flipVert) >> 30
 					is_flipped_diag := (t & flipDiag) >> 29
-
-					t &= ^(flipHoriz | flipVert | flipDiag)
-					t1 := int(t - 1) // tileset.firstgid
-					if t1 == 113 || t1 == 35 {
-						fmt.Printf("(%d) %32b -> %b (%d %d %d)\n", t1, t_orig, t, is_flipped_hor, is_flipped_ver, is_flipped_diag)
+					t &= ^(flipHoriz | flipVert | flipDiag) // cleanup flags
+					first_gid := findFirstGid(t)
+					if first_gid == 0 {
+						log.Fatal("Invalid tile gid:", t)
 					}
+					t1 := int(t - first_gid)
 					op := &ebiten.DrawImageOptions{}
 					op.GeoM.Translate(-float64(tileSize)/2, -float64(tileSize)/2)
 					if is_flipped_diag == 1 {
 						ret := ebiten.GeoM{}
-						//op.GeoM.Scale(-1, -1)
-						//op.GeoM.Rotate(-float64(math.Pi / 2))
 						ret.SetElement(0, 0, op.GeoM.Element(1, 0))
 						ret.SetElement(0, 1, op.GeoM.Element(1, 1))
 						ret.SetElement(0, 2, op.GeoM.Element(1, 2))