EntityRenderer.renderSnow refactoring / optimization

optimization.java

/* 
 * This is a optimization via simple code refactoring of the renderSnow method in EntityRenderer.java in Minecraft a1.1.X, 
 * probably works in other versions. Gains some fps in my i3, so may be interesting.	
 */

	private void renderSnow(float renderPartialTick) {
		EntityPlayerSP entityPlayerSP = this.mc.thePlayer;
		World world = this.mc.theWorld;

		// player block coordinates
		int playerX = MathHelper.floor_double(entityPlayerSP.posX);
		int playerY = MathHelper.floor_double(entityPlayerSP.posY);
		int playerZ = MathHelper.floor_double(entityPlayerSP.posZ);
		
		// Prepare tessellator & texture
		Tessellator tessellator = Tessellator.instance;
		GL11.glDisable(GL11.GL_CULL_FACE);
		GL11.glNormal3f(0.0F, 1.0F, 0.0F);
		GL11.glEnable(GL11.GL_BLEND);
		GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);
		GL11.glBindTexture(GL11.GL_TEXTURE_2D, this.mc.renderEngine.getTexture("/snow.png"));

		double interpolatedX = entityPlayerSP.lastTickPosX + (entityPlayerSP.posX - entityPlayerSP.lastTickPosX) * (double)renderPartialTick;
		double interpolatedY = entityPlayerSP.lastTickPosY + (entityPlayerSP.posY - entityPlayerSP.lastTickPosY) * (double)renderPartialTick;
		double interpolatedZ = entityPlayerSP.lastTickPosZ + (entityPlayerSP.posZ - entityPlayerSP.lastTickPosZ) * (double)renderPartialTick;

		byte radius = 5;
		if(this.mc.options.fancyGraphics) {
			radius = 10;
		}

		float f21 = (float)this.rendererUpdateCount + renderPartialTick;
		float f22 = 2.0F * (((float)(this.rendererUpdateCount & 511) + renderPartialTick) / 512.0F);
		float fAux1, fAux2, fAux3;

		for(int x = playerX - radius; x <= playerX + radius; ++x) {
			long baseForRand = x * x * 3121 + x * 45238971;
			int y1 = playerY - radius;
			int y2 = playerY + radius;

			double d25 = (double)((float)x + 0.5F) - entityPlayerSP.posX;
			
			for(int z = playerZ - radius; z <= playerZ + radius; ++z) {
				int y = world.getTopSolidOrLiquidBlock(x, z);
				if(y < 0) {
					y = 0;
				}
				
				if(y1 < y) {
					y1 = y;
				}

				if(y2 < y) {
					y2 = y;
				}

				if(y1 != y2) {
					this.rand.setSeed((long)(baseForRand + z * z * 418711 + z * 13761));					
					float f23 = this.rand.nextFloat() + f21 * 0.01F * (float)this.rand.nextGaussian();
					float f24 = this.rand.nextFloat() + f21 * (float)this.rand.nextGaussian() * 0.001F;					
					double d27 = (double)((float)z + 0.5F) - entityPlayerSP.posZ;
					float f29 = MathHelper.sqrt_double(d25 * d25 + d27 * d27) / (float)radius;
					tessellator.startDrawingQuads();
					float f30 = world.getBrightness(x, 128, z);
					GL11.glColor4f(f30, f30, f30, (1.0F - f29 * f29) * 0.7F);
					tessellator.setTranslationD(-interpolatedX, -interpolatedY, -interpolatedZ);
					fAux1 = f22 + f24;
					fAux2 = (float)y1 / 4.0F + fAux1;
					fAux3 = (float)y2 / 4.0F + fAux1;
					tessellator.addVertexWithUV((double)(x + 0), (double)y1, (double)(z + 0), (double)(       f23), (double)(fAux2));
					tessellator.addVertexWithUV((double)(x + 1), (double)y1, (double)(z + 1), (double)(2.0F + f23), (double)(fAux2));
					tessellator.addVertexWithUV((double)(x + 1), (double)y2, (double)(z + 1), (double)(2.0F + f23), (double)(fAux3));
					tessellator.addVertexWithUV((double)(x + 0), (double)y2, (double)(z + 0), (double)(       f23), (double)(fAux3));
					tessellator.addVertexWithUV((double)(x + 0), (double)y1, (double)(z + 1), (double)(       f23), (double)(fAux2));
					tessellator.addVertexWithUV((double)(x + 1), (double)y1, (double)(z + 0), (double)(2.0F + f23), (double)(fAux2));
					tessellator.addVertexWithUV((double)(x + 1), (double)y2, (double)(z + 0), (double)(2.0F + f23), (double)(fAux3));
					tessellator.addVertexWithUV((double)(x + 0), (double)y2, (double)(z + 1), (double)(       f23), (double)(fAux3));
					tessellator.setTranslationD(0.0D, 0.0D, 0.0D);
					tessellator.draw();
				}
			}
		}

		GL11.glEnable(GL11.GL_CULL_FACE);
		GL11.glDisable(GL11.GL_BLEND);
	}