如何在 SpriteKit 中获得像素化纹理？ [关闭]

Question

如何将SKTextureFilteringNearest 设置为我所有 SKTextures 的默认过滤模式？如果我没有将过滤设置为最近，我的精灵的所有边缘似乎都是模糊的。

Answer 1

SpriteKit 使用SKTextureFilteringLinear 为所有纹理设置默认过滤模式，这会导致图像模糊（尤其是在缩放时）。要解决此问题，您可以为SKTexture 和SKTextureAtlas 创建一个类别并调用正确的方法。或者你可以使用方法调配textureWithImageNamed:

SKTexture+DefaultSwizzle.h

#import <SpriteKit/SpriteKit.h>

@interface SKTexture (DefaultSwizzle)
@end

SKTexture+DefaultSwizzle.m

#import "SKTexture+DefaultSwizzle.h"
#import <objc/runtime.h> // Include objc runtime for method swizzling methods

@implementation SKTexture (DefaultSwizzle)

+ (SKTexture *)swizzled_textureWithImageNamed:(NSString*)filename
{
    // This is the original. At this point the methods have already been switched
    // which means that `swizzled_texture*` is the original.
    SKTexture *texture = [SKTexture swizzled_textureWithImageNamed:filename];

    // Set 'nearest' as default mode
    texture.filteringMode = SKTextureFilteringNearest;

    return texture;
}

+ (void)load
{
    Method original, swizzled;

    original = class_getClassMethod(self, @selector(textureWithImageNamed:));
    swizzled = class_getClassMethod(self, @selector(swizzled_textureWithImageNamed:));
    // Swizzle methods
    method_exchangeImplementations(original, swizzled);
}

@end

Answer 2

我提出了一个不同的解决方案，它可以在没有混乱的情况下工作，并且保持原始方法不变：

@interface SKTexture (FilteringModeCategory)
+(SKTexture*) textureWithImageNamed:(NSString*)file
                      filteringMode:(SKTextureFilteringMode)mode;
+(SKTexture*) textureNearestFilteredWithImageNamed:(NSString*)file;
@end

实现：

@implementation SKTexture (FilteringModeCategory)

+(SKTexture*) textureWithImageNamed:(NSString*)file 
                      filteringMode:(SKTextureFilteringMode)mode
{
    SKTexture* tex = [SKTexture textureWithImageNamed:file];
    tex.filteringMode = mode;
    return tex;
}

+(SKTexture*) textureNearestFilteredWithImageNamed:(NSString*)file
{
    SKTexture* tex = [SKTexture textureWithImageNamed:file];
    tex.filteringMode = SKTextureFilteringNearest;
    return tex;
}

@end

随意重命名第二种方法。怎么样：crispyTextureWithImageNamed？ :)

PS：SKTextureAtlas 可能也需要对应的textureNamed:filteringMode: 和textureNearestFilteredNamed: 类别方法。