added sprite illumination capability

harbdog · Jan 17, 2023 · fed3f8a · fed3f8a
1 parent 90ec971
commit fed3f8a
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Showing 2 changed files with 7 additions and 3 deletions.
diff --git a/camera.go b/camera.go
@@ -596,6 +596,7 @@ func (c *Camera) castSprite(spriteOrdIndex int) {
 	spriteTex := sprite.Texture()
 	spriteTexRect := sprite.TextureRect()
 	spriteTexWidth, spriteTexHeight := spriteTex.Size()
+	spriteIllumination := sprite.Illumination()
 
 	//transform sprite with the inverse camera matrix
 	// [ planeX   dirX ] -1                                       [ dirY      -dirX ]
@@ -714,9 +715,9 @@ func (c *Camera) castSprite(spriteOrdIndex int) {
 			// distance based lighting/shading
 			shadowDepth := math.Sqrt(transformY) * c.lightFalloff
 			spriteLvl.St[stripe] = &color.RGBA{255, 255, 255, 255}
-			spriteLvl.St[stripe].R = byte(geom.ClampInt(int(float64(spriteLvl.St[stripe].R)+shadowDepth+c.globalIllumination), int(c.minLightRGB.R), int(c.maxLightRGB.R)))
-			spriteLvl.St[stripe].G = byte(geom.ClampInt(int(float64(spriteLvl.St[stripe].G)+shadowDepth+c.globalIllumination), int(c.minLightRGB.G), int(c.maxLightRGB.G)))
-			spriteLvl.St[stripe].B = byte(geom.ClampInt(int(float64(spriteLvl.St[stripe].B)+shadowDepth+c.globalIllumination), int(c.minLightRGB.B), int(c.maxLightRGB.B)))
+			spriteLvl.St[stripe].R = byte(geom.ClampInt(int(float64(spriteLvl.St[stripe].R)+shadowDepth+c.globalIllumination+spriteIllumination), int(c.minLightRGB.R), int(c.maxLightRGB.R)))
+			spriteLvl.St[stripe].G = byte(geom.ClampInt(int(float64(spriteLvl.St[stripe].G)+shadowDepth+c.globalIllumination+spriteIllumination), int(c.minLightRGB.G), int(c.maxLightRGB.G)))
+			spriteLvl.St[stripe].B = byte(geom.ClampInt(int(float64(spriteLvl.St[stripe].B)+shadowDepth+c.globalIllumination+spriteIllumination), int(c.minLightRGB.B), int(c.maxLightRGB.B)))
 		}
 	}
 

diff --git a/sprite.go b/sprite.go
@@ -26,6 +26,9 @@ type Sprite interface {
 	// TextureRect needs to return the rectangle of the texture coordinates to draw
 	TextureRect() image.Rectangle
 
+	// Illumination needs to return sprite specific illumination offset (for normal illumination, default to 0)
+	Illumination() float64
+
 	// SetScreenRect accepts the raycasted rectangle of the screen coordinates to be rendered (nil if not on screen)
 	SetScreenRect(rect *image.Rectangle)