Packing up

- Save 8 bytes per glyph instance by switching uvs to
  FloatRepr.NORMALIZED_UNSIGNED_SHORT
- With vanilla's 256x glyph atlases we could technically save another 4
  bytes, but that would make compat with caxton, which uses 4096x
  atlases, much more difficult later

common/src/lib/java/dev/engine_room/flywheel/lib/instance/GlyphInstance.java

@@ -5,6 +5,7 @@
 import dev.engine_room.flywheel.api.instance.InstanceHandle;
 import dev.engine_room.flywheel.api.instance.InstanceType;
 import dev.engine_room.flywheel.lib.internal.FlwLibLink;
+import dev.engine_room.flywheel.lib.internal.GlyphExtension;
 import net.minecraft.client.gui.font.glyphs.BakedGlyph;
 import net.minecraft.util.FastColor;
 
@@ -15,10 +16,8 @@ public class GlyphInstance extends AbstractInstance {
 
 	public final Matrix4f pose = new Matrix4f();
 
-	public float u0;
-	public float u1;
-	public float v0;
-	public float v1;
+	public int us;
+	public int vs;
 
 	public byte red = (byte) 0xFF;
 	public byte green = (byte) 0xFF;
@@ -34,10 +33,7 @@ public GlyphInstance(InstanceType<?> type, InstanceHandle handle) {
 	public GlyphInstance setGlyph(BakedGlyph glyph, float x, float y, boolean italic) {
 		var glyphReader = FlwLibLink.INSTANCE.getGlyphExtension(glyph);
 
-		u0 = glyphReader.flywheel$u0();
-		u1 = glyphReader.flywheel$u1();
-		v0 = glyphReader.flywheel$v0();
-		v1 = glyphReader.flywheel$v1();
+		setUvs(glyphReader);
 		float left = glyphReader.flywheel$left();
 		float right = glyphReader.flywheel$right();
 		float up = glyphReader.flywheel$up();
@@ -56,10 +52,7 @@ public GlyphInstance setGlyph(BakedGlyph glyph, float x, float y, boolean italic
 	public GlyphInstance setEffect(BakedGlyph glyph, float x0, float y0, float x1, float y1, float depth) {
 		var glyphReader = FlwLibLink.INSTANCE.getGlyphExtension(glyph);
 
-		u0 = glyphReader.flywheel$u0();
-		u1 = glyphReader.flywheel$u1();
-		v0 = glyphReader.flywheel$v0();
-		v1 = glyphReader.flywheel$v1();
+		setUvs(glyphReader);
 
 		pose.translate(x0, y0, depth);
 		pose.scale(x1 - x0, y1 - y0, 1.0f);
@@ -101,4 +94,14 @@ public GlyphInstance color(byte red, byte green, byte blue) {
 		this.blue = blue;
 		return this;
 	}
+
+	private void setUvs(GlyphExtension glyphReader) {
+		float u0 = glyphReader.flywheel$u0();
+		float u1 = glyphReader.flywheel$u1();
+		float v0 = glyphReader.flywheel$v0();
+		float v1 = glyphReader.flywheel$v1();
+
+		us = (int) (u0 * 65536) | ((int) (u1 * 65536) << 16);
+		vs = (int) (v0 * 65536) | ((int) (v1 * 65536) << 16);
+	}
 }

common/src/lib/java/dev/engine_room/flywheel/lib/instance/InstanceTypes.java

@@ -107,21 +107,19 @@ public final class InstanceTypes {
 	public static final InstanceType<GlyphInstance> GLYPH = SimpleInstanceType.builder(GlyphInstance::new)
 			.layout(LayoutBuilder.create()
 					.matrix("pose", FloatRepr.FLOAT, 4)
-					.vector("u0u1v0v1", FloatRepr.FLOAT, 4)
+					.vector("u0u1v0v1", FloatRepr.NORMALIZED_UNSIGNED_SHORT, 4)
 					.vector("color", FloatRepr.NORMALIZED_UNSIGNED_BYTE, 4)
 					.vector("light", FloatRepr.UNSIGNED_SHORT, 2)
 					.build())
 			.writer((ptr, instance) -> {
 				ExtraMemoryOps.putMatrix4f(ptr, instance.pose);
-				MemoryUtil.memPutFloat(ptr + 64, instance.u0);
-				MemoryUtil.memPutFloat(ptr + 68, instance.u1);
-				MemoryUtil.memPutFloat(ptr + 72, instance.v0);
-				MemoryUtil.memPutFloat(ptr + 76, instance.v1);
-				MemoryUtil.memPutByte(ptr + 80, instance.red);
-				MemoryUtil.memPutByte(ptr + 81, instance.green);
-				MemoryUtil.memPutByte(ptr + 82, instance.blue);
-				MemoryUtil.memPutByte(ptr + 83, instance.alpha);
-				ExtraMemoryOps.put2x16(ptr + 84, instance.light);
+				ExtraMemoryOps.put2x16(ptr + 64, instance.us);
+				ExtraMemoryOps.put2x16(ptr + 68, instance.vs);
+				MemoryUtil.memPutByte(ptr + 72, instance.red);
+				MemoryUtil.memPutByte(ptr + 73, instance.green);
+				MemoryUtil.memPutByte(ptr + 74, instance.blue);
+				MemoryUtil.memPutByte(ptr + 75, instance.alpha);
+				ExtraMemoryOps.put2x16(ptr + 76, instance.light);
 			})
 			.vertexShader(Flywheel.rl("instance/glyph.vert"))
 			.cullShader(Flywheel.rl("instance/cull/glyph.glsl"))