sample_lod

sample_lod :: (texture2D tex, sampler samp, float2 uv, float lod) -> float4 {...}
sample_lod :: (textureCube tex, sampler samp, float3 dir, float lod) -> float4 {...}

pipeline BlurredReflections {

  fragment {
    float3 reflectDir = reflect(-viewDir, normal);

    // Sample rougher mip levels based on material roughness
    float roughnessLod = roughness * 8.0;  // Assume 8 mip levels
    float4 envColor = sample_lod(resources.envMap, resources.linearSampler, reflectDir, roughnessLod);

    output.color = envColor;
  }
}

// Blur reflections based on roughness
float lod = roughness * maxMipLevel;
float4 reflection = sample_lod(resources.envMap, resources.linearSampler, reflectDir, lod);

// Sample in vertex shader (no automatic LOD)
vertex {
  float4 heightData = sample_lod(resources.heightMap, resources.linearSampler, input.uv, 0.0);
  float3 pos = input.position;
  pos.y += heightData.r * heightScale;
}

// Read from specific mip level in bloom chain
float4 blur1 = sample_lod(resources.bloomTex, resources.linearSampler, uv, 1.0);
float4 blur2 = sample_lod(resources.bloomTex, resources.linearSampler, uv, 2.0);
float4 combined = blur1 * 0.5 + blur2 * 0.25;

// Visualize mip levels
float4 mip0 = sample_lod(resources.tex, resources.linearSampler, uv, 0.0);
float4 mip1 = sample_lod(resources.tex, resources.linearSampler, uv, 1.0);
float4 mip2 = sample_lod(resources.tex, resources.linearSampler, uv, 2.0);

pass "Main" {
  compute "Main" [8, 8, 1] {
  // Compute shaders must specify LOD
  float2 uv = float2(input.global_id.xy) / textureSize;
  float4 texValue = sample_lod(resources.inputTex, resources.linearSampler, uv, 0.0);
  }
}

textureLod(tex, uv, lod)

tex.SampleLevel(samplerState, uv, lod)

tex.sample(sampler, uv, level(lod))