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61 lines
2.4 KiB
Markdown
61 lines
2.4 KiB
Markdown
# Image Scaling — GPU Bilinear Resize with Sampler
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Downscale an image on the GPU using Level Zero's native **image** and **sampler** objects. The sampler performs hardware-accelerated bilinear interpolation, producing a high-quality resized image in a single kernel dispatch.
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## What It Does
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1. Decodes an embedded WebP image (1272 × 855) and converts it to RGBA
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2. Computes the target dimensions (capped at 512 px on the longest side)
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3. Discovers a GPU device and prints its basic & compute properties
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4. Creates a SPIR-V module from an OpenCL C kernel compiled offline
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5. Uses `zeKernelSuggestGroupSize` to pick an optimal 2-D workgroup size
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6. Allocates host/device memory and two Level Zero **image objects** (input & output)
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7. Creates a **sampler** with clamp addressing and bilinear filtering
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8. Executes three command lists via a command queue:
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- **Pre**: copy host pixels → device buffer → input image
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- **Compute**: launch the `scale` kernel
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- **Post**: copy output image → device buffer → host memory
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9. Writes the result to `small.png`
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## Run
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```bash
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go run main.go
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```
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## Result
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| Before Scaling (1272 × 855) | After Scaling (512 × 344) |
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|:----------------------------:|:-------------------------:|
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|  |  |
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### Console Output
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```
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=============== Image Information ===============
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Image Format: webp
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Image W/H ratio: 1.4877
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Image Size: 1272 x 855
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Scale to Image Size: 512 x 344
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Scale ratio: 0.4025
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Image Data Size: 144802 bytes
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=============== Device Basic Properties ===============
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Running on device: ID = 32103 , Name = Intel(R) Graphics @ 0.00 GHz.
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=============== Device Compute Properties ===============
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Max Group Size (X, Y, Z): (1024, 1024, 1024)
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Max Group Count (X, Y, Z): (4294967295, 4294967295, 4294967295)
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Max Total Group Size: 1024
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Max Shared Local Memory: 65536
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Subgroup Sizes: [8 16 32]
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=============== Computation Configuration ===============
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Group Size (X, Y, Z): (64, 4, 1)
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Group Count (X, Y, Z): (8, 86, 1)
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Total Elements (srcN, dstN): (4350240, 704512)
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Source Buffer Size: 4248.28 KiB
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Dest Buffer Size: 688.00 KiB
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=============== Calculation Results ===============
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GPU Execution Time: 1.579000 ms
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GPU Throughput: 2.76 GiB/s
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Test Passed!!!
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```
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