Fix camera.color (#3321)

* fix camera.color

* fix edge cases

* Simplify FlxGraphicsShader

* fix triangles

flixel/graphics/tile/FlxDrawQuadsItem.hx

@@ -130,7 +130,6 @@ 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

@@ -76,7 +76,6 @@ 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

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