功能更新

Melskin/Shaders/BrightnessContrastEffect.hlsl

@@ -0,0 +1,20 @@
+sampler2D inputTex : register(S0);
+//范围-1~1
+float brightness : register(C0);
+//范围-1~1
+float contrast : register(C1);
+
+static const float PI = 3.14159265f;
+
+float4 main(float2 uv : TEXCOORD) : COLOR
+{
+    
+    //UI的源颜色
+    float4 sourceColor = tex2D(inputTex, uv);
+    //计算对比度系数
+    float k = tan((45 + 44 * contrast) / 180 * PI);
+    //计算亮度对比度
+    float4 outColor = (sourceColor - 0.5 * (1 - brightness)) * k + 0.5 * (1 + brightness);
+
+    return outColor;
+}