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update ImageSharp code example to current API #44

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update ImageSharp code example to current API #44

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23 changes: 11 additions & 12 deletions learn/chapter1/4-textures.md
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Original file line number Diff line number Diff line change
Expand Up @@ -132,7 +132,6 @@ using System.Collections.Generic;
using OpenTK.Graphics.OpenGL4;

using SixLabors.ImageSharp;
using SixLabors.ImageSharp.Advanced;
using SixLabors.ImageSharp.PixelFormats;
using SixLabors.ImageSharp.Processing;
```
Expand All @@ -147,24 +146,24 @@ Next, we'll have to use ImageSharp to load an image, and send those pixels to Op

```cs
//Load the image
Image<Rgba32> image = Image.Load(path);
Image<Rgba32> image = Image.Load<Rgba32>(path);

//ImageSharp loads from the top-left pixel, whereas OpenGL loads from the bottom-left, causing the texture to be flipped vertically.
//This will correct that, making the texture display properly.
image.Mutate(x => x.Flip(FlipMode.Vertical));

//Get an array of the pixels, in ImageSharp's internal format.
Rgba32[] tempPixels = image.GetPixelSpan().ToArray();

//Convert ImageSharp's format into a byte array, so we can use it with OpenGL.
List<byte> pixels = new List<byte>();
var pixels = new List<byte>(4 * image.Width * image.Height);

foreach (Rgba32 p in tempPixels)
{
pixels.Add(p.R);
pixels.Add(p.G);
pixels.Add(p.B);
pixels.Add(p.A);
for (int y = 0; y < image.Height; y++) {
var row = image.GetPixelRowSpan(y);

for (int x = 0; x < image.Width; x++) {
pixels.Add(row[x].R);
pixels.Add(row[x].G);
pixels.Add(row[x].B);
pixels.Add(row[x].A);
}
}
```

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