started work on falling leaf particles

src/main/java/mods/betterfoliage/client/render/impl/EntityFXFallingLeaves.java

@@ -0,0 +1,72 @@
+package mods.betterfoliage.client.render.impl;
+
+import java.awt.Color;
+
+import mods.betterfoliage.client.BetterFoliageClient;
+import net.minecraft.block.Block;
+import net.minecraft.client.particle.EntityFX;
+import net.minecraft.client.renderer.Tessellator;
+import net.minecraft.util.IIcon;
+import net.minecraft.world.World;
+import net.minecraftforge.common.util.ForgeDirection;
+import cpw.mods.fml.relauncher.Side;
+import cpw.mods.fml.relauncher.SideOnly;
+
+@SideOnly(Side.CLIENT)
+public class EntityFXFallingLeaves extends EntityFX {
+
+	public static float biomeBrightnessMultiplier = 0.5f;
+	
+	public EntityFXFallingLeaves(World world, int x, int y, int z) {
+		super(world, x + 0.5, y, z + 0.5);
+		motionY = -0.1d;
+		particleScale = 0.75f;
+		particleIcon = BetterFoliageClient.leafParticles.icon;
+		
+		Block block = world.getBlock(x, y, z);
+		IIcon blockIcon = block.getIcon(world, x, y, z, ForgeDirection.DOWN.ordinal());
+		calculateParticleColor(BetterFoliageClient.leafParticles.getColor(blockIcon), block.colorMultiplier(world, x, y, z));
+
+	}
+
+	@Override
+	public void onUpdate() {
+		super.onUpdate();
+		motionY = -0.1d;
+	}
+
+	@Override
+	public void renderParticle(Tessellator tessellator, float partialTickTime, float rotationX, float rotationZ, float rotationYZ, float rotationXY, float rotationXZ) {
+		super.renderParticle(tessellator, partialTickTime, rotationX, rotationZ, rotationYZ, rotationXY, rotationXZ);
+	}
+
+	/** Calculates and sets the color of the particle by blending the average color of the block texture with the current biome color
+	 *  Blending is done in HSB color space, weighted by the relative saturation of the colors
+	 * @param textureAvgColor average color of the block texture
+	 * @param blockColor biome color at the spawning block
+	 */
+	public void calculateParticleColor(int textureAvgColor, int blockColor) {
+		float[] hsbTexture = Color.RGBtoHSB((textureAvgColor >> 16) & 0xFF, (textureAvgColor >> 8) & 0xFF, textureAvgColor & 0xFF, null);
+		float[] hsbBlock = Color.RGBtoHSB((blockColor >> 16) & 0xFF, (blockColor >> 8) & 0xFF, blockColor & 0xFF, null);
+		
+		float weightTex = hsbTexture[1] / (hsbTexture[1] + hsbBlock[1]);
+		float weightBlock = 1.0f - weightTex;
+		
+		// avoid circular average for hue for performance reasons
+		// one of the color components should dominate anyway
+		float h = weightTex * hsbTexture[0] + weightBlock * hsbBlock[0];
+		float s = weightTex * hsbTexture[1] + weightBlock * hsbBlock[1];
+		float b = weightTex * hsbTexture[2] + weightBlock * hsbBlock[2] * biomeBrightnessMultiplier;
+		int particleColor = Color.HSBtoRGB(h, s, b);
+		
+		particleBlue = (particleColor & 0xFF) / 256.0f;
+		particleGreen = ((particleColor >> 8) & 0xFF) / 256.0f;
+		particleRed = ((particleColor >> 16) & 0xFF) / 256.0f;
+	}
+	
+	@Override
+	public int getFXLayer() {
+		return 1;
+	}
+
+}