Revert "Fix camera.color (#3321)" (#3324)

This reverts commit 593f04f.

flixel/graphics/tile/FlxDrawQuadsItem.hx

@@ -130,6 +130,7 @@ class FlxDrawQuadsItem extends FlxDrawBaseItem<FlxDrawQuadsItem>
 			shader.colorOffset.value = colorOffsets;
 		}
 
+		setParameterValue(shader.hasTransform, true);
 		setParameterValue(shader.hasColorTransform, colored || hasColorOffsets);
 
 		#if (openfl > "8.7.0")

flixel/graphics/tile/FlxDrawTrianglesItem.hx

@@ -76,6 +76,7 @@ class FlxDrawTrianglesItem extends FlxDrawBaseItem<FlxDrawTrianglesItem>
 			shader.colorOffset.value = null;
 		}
 
+		setParameterValue(shader.hasTransform, true);
 		setParameterValue(shader.hasColorTransform, colored || hasColorOffsets);
 
 		#if (openfl > "8.7.0")

flixel/graphics/tile/FlxGraphicsShader.hx

@@ -4,31 +4,66 @@ import openfl.display.GraphicsShader;
 
 class FlxGraphicsShader extends GraphicsShader
 {
-	@:glFragmentHeader("
-		uniform float alpha;
-		uniform vec4 colorMultiplier;
-		uniform vec4 colorOffset;
+	@:glVertexSource("
+		#pragma header
+
+		attribute float alpha;
+		attribute vec4 colorMultiplier;
+		attribute vec4 colorOffset;
 		uniform bool hasColorTransform;
-		
-		vec4 transform(bool has, vec4 color, vec4 mult, vec4 offset)
+
+		void main(void)
 		{
-			return mix(color, clamp(offset + (color * mult), 0.0, 1.0), float(has));
-		}
-		
+			#pragma body
+
+			openfl_Alphav = openfl_Alpha * alpha;
+
+			if (hasColorTransform)
+			{
+				openfl_ColorOffsetv = colorOffset / 255.0;
+				openfl_ColorMultiplierv = colorMultiplier;
+			}
+		}")
+	@:glFragmentHeader("
+		uniform bool hasTransform;
+		uniform bool hasColorTransform;
+
 		vec4 flixel_texture2D(sampler2D bitmap, vec2 coord)
 		{
 			vec4 color = texture2D(bitmap, coord);
-			
-			color = transform(openfl_HasColorTransform, color, openfl_ColorMultiplierv, openfl_ColorOffsetv);
-			color = transform(hasColorTransform, color, colorMultiplier, colorOffset / 255.0);
-			
-			float _alpha = color.a * openfl_Alphav * alpha;
-			return vec4 (color.rgb * _alpha, _alpha);
+			if (!hasTransform)
+			{
+				return color;
+			}
+
+			if (color.a == 0.0)
+			{
+				return vec4(0.0, 0.0, 0.0, 0.0);
+			}
+
+			if (!hasColorTransform)
+			{
+				return color * openfl_Alphav;
+			}
+
+			color = vec4(color.rgb / color.a, color.a);
+
+			color = clamp(openfl_ColorOffsetv + (color * openfl_ColorMultiplierv), 0.0, 1.0);
+
+			if (color.a > 0.0)
+			{
+				return vec4(color.rgb * color.a * openfl_Alphav, color.a * openfl_Alphav);
+			}
+			return vec4(0.0, 0.0, 0.0, 0.0);
 		}
 	")
-	@:glFragmentBody("
-		gl_FragColor = flixel_texture2D(bitmap, openfl_TextureCoordv);
-	")
+	@:glFragmentSource("
+		#pragma header
+
+		void main(void)
+		{
+			gl_FragColor = flixel_texture2D(bitmap, openfl_TextureCoordv);
+		}")
 	public function new()
 	{
 		super();