Question

我在我正在编写的应用程序中使用此示例项目的XNA 4.0表单控件：http://creators.xna.com/en-US/sample/winforms_series1

如果您不熟悉FXAA，请查看创建者的网站： http://timothylottes.blogspot.com/2011/03/nvidia-fxaa.html

到目前为止，我花了相当多的时间试图在没有运气的情况下使用它（到目前为止......）。确实，我对图形编程没有多少经验，但我现在有一个很好的应用程序运行，它看起来真的很糟糕的锯齿线。我知道AA的内置方法，但对我和我的笔记本电脑不起作用。所以我的要求是关于使用FXAA而不是内置方法。

此时：我的Content项目中有FXAA 3.11头文件。我有一个由visual studio生成的通用FX文件，其中包括：

#define FXAA_PC_CONSOLE 1
#define FXAA_HLSL_5 1
#define FXAA_QUALITY__PRESET 12
#include "Includes/Fxaa3_11.h"

我只是在这里询问是否有人可以提供一些XNA 4.0示例，特别是使用该自定义Windows窗体方法。

我感谢有人可能提供的任何帮助。

编辑3： 自从我发布此消息以来，我一直在努力研究如何让FXAA正常工作。我找到了这个： http://www.gamedev.net/topic/609638-fxaa-help/page__st__20 还有这个： http://fxaa-pp-inject.assembla.me/trunk/DirectX9/shader.fx

我将FXAA划分为裸骨FXAA_PC_CONSOLE类型并进行编译。我只需要找出参数fxaaConsolePosPos，即每个像素的左上角和右下角位置。无论如何，看起来FXAA_PC_CONSOLE可能与shader模型2.0一起使用，我需要使用REACH和winforms基于XNA。

Answer 1

所以我想通了，至少使用为控制台和低端PC设计的较小版本的FXAA。我不能保证我的着色器代码参数是正确的，但我确实看到它运行时有明显的差异。

以下是使用我的切碎着色器和C＃XNA 4.0代码的完整解决方案：

首先使用着色器代码（将其放在Content子项目的.fx文件中）： 请注意，我根据SM2.0不支持第一种类型的建议将tex2D替换为tex2D

#define FxaaBool bool
#define FxaaDiscard clip(-1)
#define FxaaFloat float
#define FxaaFloat2 float2
#define FxaaFloat3 float3
#define FxaaFloat4 float4
#define FxaaHalf half
#define FxaaHalf2 half2
#define FxaaHalf3 half3
#define FxaaHalf4 half4
#define FxaaSat(x) saturate(x)

#define FxaaInt2 float2
#define FxaaTex sampler2D
#define FxaaTexTop(t, p) tex2D(t, float4(p, 0.0, 0.0))
#define FxaaTexOff(t, p, o, r) tex2D(t, float4(p + (o * r), 0, 0))

FxaaFloat FxaaLuma(FxaaFloat4 rgba) { 
    rgba.w = dot(rgba.rgb, FxaaFloat3(0.299, 0.587, 0.114));
return  rgba.w; }

/*============================================================================
                         FXAA3 CONSOLE - PC VERSION
============================================================================*/
FxaaFloat4 FxaaPixelShader(
    FxaaFloat2 pos,
    FxaaFloat4 fxaaConsolePosPos,
    FxaaTex tex,
    FxaaFloat4 fxaaConsoleRcpFrameOpt,
    FxaaFloat4 fxaaConsoleRcpFrameOpt2,
    FxaaFloat fxaaConsoleEdgeSharpness,
    FxaaFloat fxaaConsoleEdgeThreshold,
    FxaaFloat fxaaConsoleEdgeThresholdMin) {
    FxaaFloat lumaNw = FxaaLuma(FxaaTexTop(tex, fxaaConsolePosPos.xy));
    FxaaFloat lumaSw = FxaaLuma(FxaaTexTop(tex, fxaaConsolePosPos.xw));
    FxaaFloat lumaNe = FxaaLuma(FxaaTexTop(tex, fxaaConsolePosPos.zy));
    FxaaFloat lumaSe = FxaaLuma(FxaaTexTop(tex, fxaaConsolePosPos.zw));
    FxaaFloat4 rgbyM = FxaaTexTop(tex, pos.xy);
    #if (FXAA_GREEN_AS_LUMA == 0)
        FxaaFloat lumaM = rgbyM.w;
    #else
        FxaaFloat lumaM = rgbyM.y;
    #endif
    FxaaFloat lumaMaxNwSw = max(lumaNw, lumaSw);
    lumaNe += 1.0/384.0;
    FxaaFloat lumaMinNwSw = min(lumaNw, lumaSw);
    FxaaFloat lumaMaxNeSe = max(lumaNe, lumaSe);
    FxaaFloat lumaMinNeSe = min(lumaNe, lumaSe);
    FxaaFloat lumaMax = max(lumaMaxNeSe, lumaMaxNwSw);
    FxaaFloat lumaMin = min(lumaMinNeSe, lumaMinNwSw);
    FxaaFloat lumaMaxScaled = lumaMax * fxaaConsoleEdgeThreshold;
    FxaaFloat lumaMinM = min(lumaMin, lumaM);
    FxaaFloat lumaMaxScaledClamped = max(fxaaConsoleEdgeThresholdMin, lumaMaxScaled);
    FxaaFloat lumaMaxM = max(lumaMax, lumaM);
    FxaaFloat dirSwMinusNe = lumaSw - lumaNe;
    FxaaFloat lumaMaxSubMinM = lumaMaxM - lumaMinM;
    FxaaFloat dirSeMinusNw = lumaSe - lumaNw;
    if(lumaMaxSubMinM < lumaMaxScaledClamped) return rgbyM;
    FxaaFloat2 dir;
    dir.x = dirSwMinusNe + dirSeMinusNw;
    dir.y = dirSwMinusNe - dirSeMinusNw;
    FxaaFloat2 dir1 = normalize(dir.xy);
    FxaaFloat4 rgbyN1 = FxaaTexTop(tex, pos.xy - dir1 * fxaaConsoleRcpFrameOpt.zw);
    FxaaFloat4 rgbyP1 = FxaaTexTop(tex, pos.xy + dir1 * fxaaConsoleRcpFrameOpt.zw);
    FxaaFloat dirAbsMinTimesC = min(abs(dir1.x), abs(dir1.y)) * fxaaConsoleEdgeSharpness;
    FxaaFloat2 dir2 = clamp(dir1.xy / dirAbsMinTimesC, -2.0, 2.0);
    FxaaFloat4 rgbyN2 = FxaaTexTop(tex, pos.xy - dir2 * fxaaConsoleRcpFrameOpt2.zw);
    FxaaFloat4 rgbyP2 = FxaaTexTop(tex, pos.xy + dir2 * fxaaConsoleRcpFrameOpt2.zw);
    FxaaFloat4 rgbyA = rgbyN1 + rgbyP1;
    FxaaFloat4 rgbyB = ((rgbyN2 + rgbyP2) * 0.25) + (rgbyA * 0.25);
    #if (FXAA_GREEN_AS_LUMA == 0)
        FxaaBool twoTap = (rgbyB.w < lumaMin) || (rgbyB.w > lumaMax);
    #else
        FxaaBool twoTap = (rgbyB.y < lumaMin) || (rgbyB.y > lumaMax);
    #endif
    if(twoTap) rgbyB.xyz = rgbyA.xyz * 0.5;
    return rgbyB; 
}
/*==========================================================================*/

uniform extern float SCREEN_WIDTH;
uniform extern float SCREEN_HEIGHT;
uniform extern texture gScreenTexture;

sampler screenSampler = sampler_state
{
    Texture = <gScreenTexture>;
    /*MinFilter = LINEAR;
    MagFilter = LINEAR;
    MipFilter = LINEAR;
    AddressU = Clamp;
    AddressV = Clamp;*/
};

float4 PixelShaderFunction(float2 tc : TEXCOORD0) : COLOR0
{
    float pixelWidth = (1 / SCREEN_WIDTH);
    float pixelHeight = (1 / SCREEN_HEIGHT);

    float2 pixelCenter = float2(tc.x - pixelWidth, tc.y - pixelHeight);
    float4 fxaaConsolePosPos = float4(tc.x, tc.y, tc.x + pixelWidth, tc.y + pixelHeight);

    return FxaaPixelShader(
        pixelCenter,
        fxaaConsolePosPos,
        screenSampler,
        float4(-0.50 / SCREEN_WIDTH, -0.50 / SCREEN_HEIGHT, 0.50 / SCREEN_WIDTH, 0.50 / SCREEN_HEIGHT),
        float4(-2.0 / SCREEN_WIDTH, -2.0 / SCREEN_HEIGHT, 2.0 / SCREEN_WIDTH, 2.0 / SCREEN_HEIGHT),
        8.0,
        0.125,
        0.05);
}

technique ppfxaa
{
    pass Pass1
    {
        PixelShader = compile ps_2_0 PixelShaderFunction();
    }
}

以下是应用着色器的C-sharp代码片段：

//..........................................
//these objects are used in managing the FXAA operation

//FXAA objects (anti-aliasing)
RenderTarget2D renderTarget;
SpriteBatch spriteBatch;
Effect fxaaAntialiasing;

//..........................................
//initialize the render target and set effect parameters

//code to handle a final antialiasing using a pixel shader
renderTarget = new RenderTarget2D(
    GraphicsDevice,
    GraphicsDevice.PresentationParameters.BackBufferWidth,
    GraphicsDevice.PresentationParameters.BackBufferHeight,
    false,
    GraphicsDevice.PresentationParameters.BackBufferFormat,
    DepthFormat.Depth24);

spriteBatch = new SpriteBatch(GraphicsDevice);
fxaaAntialiasing = content.Load<Effect>("sfxaa");
fxaaAntialiasing.CurrentTechnique = fxaaAntialiasing.Techniques["ppfxaa"];
fxaaAntialiasing.Parameters["SCREEN_WIDTH"].SetValue(renderTarget.Width);
fxaaAntialiasing.Parameters["SCREEN_HEIGHT"].SetValue(renderTarget.Height);
fxaaAntialiasing.Parameters["gScreenTexture"].SetValue(renderTarget as Texture2D);


//..........................................
//this should happen in your Draw() method

//change to our offscreen render target
GraphicsDevice.SetRenderTarget(renderTarget);
GraphicsDevice.Clear(Color.CornflowerBlue);

//
//draw all of your models and such here...
//

GraphicsDevice.SetRenderTarget(null);
GraphicsDevice.Clear(Color.Black);

//this where the shader antialiasing happens to the frame we just filled with content
spriteBatch.Begin(SpriteSortMode.Immediate, BlendState.AlphaBlend,
    SamplerState.LinearClamp, DepthStencilState.Default, 
    RasterizerState.CullNone, fxaaAntialiasing);

//draw the buffer we made to the screen
spriteBatch.Draw(renderTarget as Texture2D, 
    new Rectangle(0, 0, renderTarget.Width, renderTarget.Height), 
    Color.White);

spriteBatch.End();

Answer 2

我最近在我的游戏中实现了这种技术，但出于某种原因，我的边缘仍然是“锯齿状”。有没有办法在某处调整代码以稍微软化锯齿状边缘？谢谢。

在XNA 4.0 winforms中使用Nvidia FXAA（着色器抗锯齿）的示例？

2 个答案: