Fix climbing on the right bug + eager-render boolprop

* New boolProp to help debug memory issues: eager-render, set it to
  false and the loadscreen will not eagerload Go images for all the
  level chunks.
* Finally fix the level collision bug where the player could climb walls
  to the right.

pkg/balance/boolprops.go

@@ -45,6 +45,10 @@ var Boolprops = map[string]Boolprop{
 		Get: func() bool { return CompressDrawings },
 		Set: func(v bool) { CompressDrawings = v },
 	},
+	"eager-render": {
+		Get: func() bool { return EagerRenderLevelChunks },
+		Set: func(v bool) { EagerRenderLevelChunks = v },
+	},
 }
 
 // GetBoolProp reads the current value of a boolProp.

pkg/balance/numbers.go

@@ -105,6 +105,14 @@ var (
 	// Limits on the Flood Fill tool so it doesn't run away on us.
 	FloodToolVoidLimit = 600  // If clicking the void, +- 1000 px limit
 	FloodToolLimit     = 1200 // If clicking a valid color on the level
+
+	// Eager render level chunks to images during the load screen.
+	// Originally chunks rendered to image and SDL texture on-demand, the loadscreen was
+	// added to eager load (to image) the whole entire level at once (SDL textures were
+	// still on demand, as they scroll into screen). Control this in-game with
+	// `boolProp eager-render false` and the loadscreen will go quicker cuz it won't
+	// load the whole entire level. Maybe useful to explore memory issues.
+	EagerRenderLevelChunks = true
 )
 
 // Edit Mode Values

pkg/collision/collide_level.go

@@ -162,6 +162,10 @@ func CollidesWithGrid(d Actor, grid *level.Chunker, target render.Point) (*Colli
 			// left wall sometimes, but breaks walking up leftward slopes.
 			point.X = capLeft
 		}
+		if capRight != 0 && point.X > capRight {
+			// This if check fixes the climbing-walls-on-the-right bug.
+			point.X = capRight
+		}
 
 		if has := result.ScanBoundingBox(render.Rect{
 			X: point.X,

pkg/modal/loadscreen/loadscreen.go

@@ -7,6 +7,7 @@ import (
 
 	"git.kirsle.net/apps/doodle/pkg/balance"
 	"git.kirsle.net/apps/doodle/pkg/level"
+	"git.kirsle.net/apps/doodle/pkg/log"
 	"git.kirsle.net/apps/doodle/pkg/shmem"
 	"git.kirsle.net/apps/doodle/pkg/uix"
 	"git.kirsle.net/go/render"
@@ -225,9 +226,12 @@ func Loop(windowSize render.Rect, e render.Engine) {
 // of chunks vs. chunks remaining to pre-cache bitmaps from.
 func PreloadAllChunkBitmaps(chunker *level.Chunker) {
 	loadChunksTarget := len(chunker.Chunks)
-	// if loadChunksTarget == 0 {
-	// 	return
-	// }
+
+	// Skipping the eager rendering of chunks?
+	if !balance.EagerRenderLevelChunks {
+		log.Info("PreloadAllChunkBitmaps: skipping eager render")
+		return
+	}
 
 	for {
 		remaining := chunker.PrerenderN(10)