GS/HW: Reject malformed UVs in shader anisotropic filtering

bin/resources/shaders/dx11/tfx.fx

@@ -263,6 +263,9 @@ float manual_lod(float uv_w)
 #if PS_ANISOTROPIC_FILTERING > 1
 float4 sample_c_af(float2 uv, float uv_w)
 {
+	// HW sampler will reject bad UVs, match that here.
+	uv = any(isnan(uv) | isinf(uv)) ? float2(0, 0) : uv;
+
 	// Below taken from https://microsoft.github.io/DirectX-Specs/d3d/archive/D3D11_3_FunctionalSpec.htm#7.18.11%20LOD%20Calculations
 	// With guidance from https://pema.dev/2025/05/09/mipmaps-too-much-detail/ 
 	float2 sz;

bin/resources/shaders/opengl/tfx_fs.glsl

@@ -212,6 +212,9 @@ float manual_lod(float uv_w)
 #if PS_ANISOTROPIC_FILTERING > 1
 vec4 sample_c_af(vec2 uv, float uv_w)
 {
+	// HW sampler will reject bad UVs, match that here.
+	uv = (any(isnan(uv)) || any(isinf(uv))) ? vec2(0, 0) : uv;
+
 	// Below taken from https://microsoft.github.io/DirectX-Specs/d3d/archive/D3D11_3_FunctionalSpec.htm#7.18.11%20LOD%20Calculations
 	// With guidance from https://pema.dev/2025/05/09/mipmaps-too-much-detail/ 
 	vec2 sz = textureSize(TextureSampler, 0);

bin/resources/shaders/vulkan/tfx.glsl

@@ -552,6 +552,9 @@ float manual_lod(float uv_w)
 #if PS_ANISOTROPIC_FILTERING > 1
 vec4 sample_c_af(vec2 uv, float uv_w)
 {
+	// HW sampler will reject bad UVs, match that here.
+	uv = (any(isnan(uv)) || any(isinf(uv))) ? vec2(0, 0) : uv;
+
 	// Below taken from https://microsoft.github.io/DirectX-Specs/d3d/archive/D3D11_3_FunctionalSpec.htm#7.18.11%20LOD%20Calculations
 	// With guidance from https://pema.dev/2025/05/09/mipmaps-too-much-detail/ 
 	vec2 sz = textureSize(Texture, 0);

pcsx2/GS/Renderers/Metal/tfx.metal

@@ -461,6 +461,9 @@ struct PSMain
 
 	float4 sample_c_af(float2 uv, float uv_w)
 	{
+		// HW sampler will reject bad UVs, match that here.
+		uv = any(isnan(uv) | isinf(uv)) ? float2(0, 0) : uv;
+
 		// Below taken from https://microsoft.github.io/DirectX-Specs/d3d/archive/D3D11_3_FunctionalSpec.htm#7.18.11%20LOD%20Calculations
 		// With guidance from https://pema.dev/2025/05/09/mipmaps-too-much-detail/
 		float2 sz = float2(get_tex_dims());

pcsx2/ShaderCacheVersion.h

@@ -3,4 +3,4 @@
 
 /// Version number for GS and other shaders. Increment whenever any of the contents of the
 /// shaders change, to invalidate the cache.
-static constexpr u32 SHADER_CACHE_VERSION = 90; // Last changed in PR 14349
+static constexpr u32 SHADER_CACHE_VERSION = 91; // Last changed in PR 14370