content: package net.minecraft.client.renderer.texture;
  
  import net.minecraft.client.Minecraft;
  import net.minecraft.client.renderer.GLAllocation;
  import net.minecraft.client.renderer.GlStateManager;
  import net.minecraft.client.resources.IResourceManager;
  import net.minecraft.src.Config;
  import net.minecraft.util.ResourceLocation;
  import net.optifine.Mipmaps;
  import org.apache.commons.io.IOUtils;
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
  import org.lwjgl.opengl.GL11;
  import org.lwjgl.opengl.GL12;
  import org.lwjgl.opengl.GL14;
  
  import javax.imageio.ImageIO;
  import java.awt.image.BufferedImage;
  import java.io.IOException;
  import java.io.InputStream;
  import java.nio.ByteBuffer;
  import java.nio.IntBuffer;
  
  public class TextureUtil {
      private static final Logger logger = LogManager.getLogger();
      private static final IntBuffer dataBuffer = GLAllocation.createDirectIntBuffer(4194304);
      public static final DynamicTexture missingTexture = new DynamicTexture(16, 16);
      public static final int[] missingTextureData = missingTexture.getTextureData();
      private static final int[] mipmapBuffer;
      private static final int[] dataArray = new int[4194304];
  
      public static int glGenTextures() {
          return GlStateManager.generateTexture();
      }
  
      public static void deleteTexture(int textureId) {
          GlStateManager.deleteTexture(textureId);
      }
  
      public static int uploadTextureImage(int p_110987_0_, BufferedImage p_110987_1_) {
          return uploadTextureImageAllocate(p_110987_0_, p_110987_1_, false, false);
      }
  
      public static void uploadTexture(int textureId, int[] p_110988_1_, int p_110988_2_, int p_110988_3_) {
          bindTexture(textureId);
          uploadTextureSub(0, p_110988_1_, p_110988_2_, p_110988_3_, 0, 0, false, false, false);
      }
  
      public static int[][] generateMipmapData(int p_147949_0_, int p_147949_1_, int[][] p_147949_2_) {
          int[][] aint = new int[p_147949_0_ + 1][];
          aint[0] = p_147949_2_[0];
  
          if (p_147949_0_ > 0) {
              boolean flag = false;
  
              for (int i = 0; i < p_147949_2_[0].length; ++i) {
                  if (p_147949_2_[0][i] >> 24 == 0) {
                      flag = true;
                      break;
                  }
              }
  
              for (int l1 = 1; l1 <= p_147949_0_; ++l1) {
                  if (p_147949_2_[l1] != null) {
                      aint[l1] = p_147949_2_[l1];
                  } else {
                      int[] aint1 = aint[l1 - 1];
                      int[] aint2 = new int[aint1.length >> 2];
                      int j = p_147949_1_ >> l1;
                      int k = aint2.length / j;
                      int l = j << 1;
  
                      for (int i1 = 0; i1 < j; ++i1) {
                          for (int j1 = 0; j1 < k; ++j1) {
                              int k1 = 2 * (i1 + j1 * l);
                              aint2[i1 + j1 * j] = blendColors(aint1[k1], aint1[k1 + 1], aint1[k1 + l], aint1[k1 + 1 + l], flag);
                          }
                      }
  
                      aint[l1] = aint2;
                  }
              }
          }
  
          return aint;
      }
  
      private static int blendColors(int p_147943_0_, int p_147943_1_, int p_147943_2_, int p_147943_3_, boolean p_147943_4_) {
          return Mipmaps.alphaBlend(p_147943_0_, p_147943_1_, p_147943_2_, p_147943_3_);
      }
  
      private static int blendColorComponent(int p_147944_0_, int p_147944_1_, int p_147944_2_, int p_147944_3_, int p_147944_4_) {
          float f = (float) Math.pow((float) (p_147944_0_ >> p_147944_4_ & 255) / 255.0F, 2.2D);
          float f1 = (float) Math.pow((float) (p_147944_1_ >> p_147944_4_ & 255) / 255.0F, 2.2D);
          float f2 = (float) Math.pow((float) (p_147944_2_ >> p_147944_4_ & 255) / 255.0F, 2.2D);
          float f3 = (float) Math.pow((float) (p_147944_3_ >> p_147944_4_ & 255) / 255.0F, 2.2D);
          float f4 = (float) Math.pow((double) (f + f1 + f2 + f3) * 0.25D, 0.45454545454545453D);
          return (int) ((double) f4 * 255.0D);
      }
  
      public static void uploadTextureMipmap(int[][] p_147955_0_, int p_147955_1_, int p_147955_2_, int p_147955_3_, int p_147955_4_, boolean p_147955_5_, boolean p_147955_6_) {
          for (int i = 0; i < p_147955_0_.length; ++i) {
              int[] aint = p_147955_0_[i];
              uploadTextureSub(i, aint, p_147955_1_ >> i, p_147955_2_ >> i, p_147955_3_ >> i, p_147955_4_ >> i, p_147955_5_, p_147955_6_, p_147955_0_.length > 1);
          }
      }
  
      private static void uploadTextureSub(int p_147947_0_, int[] p_147947_1_, int p_147947_2_, int p_147947_3_, int p_147947_4_, int p_147947_5_, boolean p_147947_6_, boolean p_147947_7_, boolean p_147947_8_) {
          int i = 4194304 / p_147947_2_;
          setTextureBlurMipmap(p_147947_6_, p_147947_8_);
          setTextureClamped(p_147947_7_);
          int j;
  
          for (int k = 0; k < p_147947_2_ * p_147947_3_; k += p_147947_2_ * j) {
              int l = k / p_147947_2_;
              j = Math.min(i, p_147947_3_ - l);
              int i1 = p_147947_2_ * j;
              copyToBufferPos(p_147947_1_, k, i1);
              GL11.glTexSubImage2D(GL11.GL_TEXTURE_2D, p_147947_0_, p_147947_4_, p_147947_5_ + l, p_147947_2_, j, GL12.GL_BGRA, GL12.GL_UNSIGNED_INT_8_8_8_8_REV, dataBuffer);
          }
      }
  
      public static int uploadTextureImageAllocate(int p_110989_0_, BufferedImage p_110989_1_, boolean p_110989_2_, boolean p_110989_3_) {
          allocateTexture(p_110989_0_, p_110989_1_.getWidth(), p_110989_1_.getHeight());
          return uploadTextureImageSub(p_110989_0_, p_110989_1_, 0, 0, p_110989_2_, p_110989_3_);
      }
  
      public static void allocateTexture(int p_110991_0_, int p_110991_1_, int p_110991_2_) {
          allocateTextureImpl(p_110991_0_, 0, p_110991_1_, p_110991_2_);
      }
  
      public static void allocateTextureImpl(int p_180600_0_, int p_180600_1_, int p_180600_2_, int p_180600_3_) {
          Object object = TextureUtil.class;
  
          synchronized (object) {
              deleteTexture(p_180600_0_);
              bindTexture(p_180600_0_);
          }
  
          if (p_180600_1_ >= 0) {
              GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL12.GL_TEXTURE_MAX_LEVEL, p_180600_1_);
              GL11.glTexParameterf(GL11.GL_TEXTURE_2D, GL12.GL_TEXTURE_MIN_LOD, 0.0F);
              GL11.glTexParameterf(GL11.GL_TEXTURE_2D, GL12.GL_TEXTURE_MAX_LOD, (float) p_180600_1_);
              GL11.glTexParameterf(GL11.GL_TEXTURE_2D, GL14.GL_TEXTURE_LOD_BIAS, 0.0F);
          }
  
          for (int i = 0; i <= p_180600_1_; ++i) {
              GL11.glTexImage2D(GL11.GL_TEXTURE_2D, i, GL11.GL_RGBA, p_180600_2_ >> i, p_180600_3_ >> i, 0, GL12.GL_BGRA, GL12.GL_UNSIGNED_INT_8_8_8_8_REV, (ByteBuffer) null);
          }
      }
  
      public static int uploadTextureImageSub(int textureId, BufferedImage p_110995_1_, int p_110995_2_, int p_110995_3_, boolean p_110995_4_, boolean p_110995_5_) {
          bindTexture(textureId);
          uploadTextureImageSubImpl(p_110995_1_, p_110995_2_, p_110995_3_, p_110995_4_, p_110995_5_);
          return textureId;
      }
  
      private static void uploadTextureImageSubImpl(BufferedImage p_110993_0_, int p_110993_1_, int p_110993_2_, boolean p_110993_3_, boolean p_110993_4_) {
          int i = p_110993_0_.getWidth();
          int j = p_110993_0_.getHeight();
          int k = 4194304 / i;
          int[] aint = dataArray;
          setTextureBlurred(p_110993_3_);
          setTextureClamped(p_110993_4_);
  
          for (int l = 0; l < i * j; l += i * k) {
              int i1 = l / i;
              int j1 = Math.min(k, j - i1);
              int k1 = i * j1;
              p_110993_0_.getRGB(0, i1, i, j1, aint, 0, i);
              copyToBuffer(aint, k1);
              GL11.glTexSubImage2D(GL11.GL_TEXTURE_2D, 0, p_110993_1_, p_110993_2_ + i1, i, j1, GL12.GL_BGRA, GL12.GL_UNSIGNED_INT_8_8_8_8_REV, dataBuffer);
          }
      }
  
      public static void setTextureClamped(boolean p_110997_0_) {
          if (p_110997_0_) {
              GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_WRAP_S, GL12.GL_CLAMP_TO_EDGE);
              GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_WRAP_T, GL12.GL_CLAMP_TO_EDGE);
          } else {
              GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_WRAP_S, GL11.GL_REPEAT);
              GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_WRAP_T, GL11.GL_REPEAT);
          }
      }
  
      private static void setTextureBlurred(boolean p_147951_0_) {
          setTextureBlurMipmap(p_147951_0_, false);
      }
  
      public static void setTextureBlurMipmap(boolean p_147954_0_, boolean p_147954_1_) {
          if (p_147954_0_) {
              GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MIN_FILTER, p_147954_1_ ? GL11.GL_LINEAR_MIPMAP_LINEAR : GL11.GL_LINEAR);
              GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MAG_FILTER, GL11.GL_LINEAR);
          } else {
              int i = Config.getMipmapType();
              GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MIN_FILTER, p_147954_1_ ? i : GL11.GL_NEAREST);
              GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MAG_FILTER, GL11.GL_NEAREST);
          }
      }
  
      private static void copyToBuffer(int[] p_110990_0_, int p_110990_1_) {
          copyToBufferPos(p_110990_0_, 0, p_110990_1_);
      }
  
      private static void copyToBufferPos(int[] p_110994_0_, int p_110994_1_, int p_110994_2_) {
          int[] aint = p_110994_0_;
  
          if (Minecraft.getMinecraft().gameSettings.anaglyph) {
              aint = updateAnaglyph(p_110994_0_);
          }
  
          dataBuffer.clear();
          dataBuffer.put(aint, p_110994_1_, p_110994_2_);
          dataBuffer.position(0).limit(p_110994_2_);
      }
  
      static void bindTexture(int p_94277_0_) {
          GlStateManager.bindTexture(p_94277_0_);
      }
  
      public static int[] readImageData(IResourceManager resourceManager, ResourceLocation imageLocation) throws IOException {
          BufferedImage bufferedimage = readBufferedImage(resourceManager.getResource(imageLocation).getInputStream());
  
          if (bufferedimage == null) {
              return null;
          } else {
              int i = bufferedimage.getWidth();
              int j = bufferedimage.getHeight();
              int[] aint = new int[i * j];
              bufferedimage.getRGB(0, 0, i, j, aint, 0, i);
              return aint;
          }
      }
  
      public static BufferedImage readBufferedImage(InputStream imageStream) throws IOException {
          if (imageStream == null) {
              return null;
          } else {
              BufferedImage bufferedimage;
  
              try {
                  bufferedimage = ImageIO.read(imageStream);
              } finally {
                  IOUtils.closeQuietly(imageStream);
              }
  
              return bufferedimage;
          }
      }
  
      public static int[] updateAnaglyph(int[] p_110985_0_) {
          int[] aint = new int[p_110985_0_.length];
  
          for (int i = 0; i < p_110985_0_.length; ++i) {
              aint[i] = anaglyphColor(p_110985_0_[i]);
          }
  
          return aint;
      }
  
      public static int anaglyphColor(int p_177054_0_) {
          int i = p_177054_0_ >> 24 & 255;
          int j = p_177054_0_ >> 16 & 255;
          int k = p_177054_0_ >> 8 & 255;
          int l = p_177054_0_ & 255;
          int i1 = (j * 30 + k * 59 + l * 11) / 100;
          int j1 = (j * 30 + k * 70) / 100;
          int k1 = (j * 30 + l * 70) / 100;
          return i << 24 | i1 << 16 | j1 << 8 | k1;
      }
  
      public static void processPixelValues(int[] p_147953_0_, int p_147953_1_, int p_147953_2_) {
          int[] aint = new int[p_147953_1_];
          int i = p_147953_2_ / 2;
  
          for (int j = 0; j < i; ++j) {
              System.arraycopy(p_147953_0_, j * p_147953_1_, aint, 0, p_147953_1_);
              System.arraycopy(p_147953_0_, (p_147953_2_ - 1 - j) * p_147953_1_, p_147953_0_, j * p_147953_1_, p_147953_1_);
              System.arraycopy(aint, 0, p_147953_0_, (p_147953_2_ - 1 - j) * p_147953_1_, p_147953_1_);
          }
      }
  
      static {
          int i = -16777216;
          int j = -524040;
          int[] aint = new int[]{-524040, -524040, -524040, -524040, -524040, -524040, -524040, -524040};
          int[] aint1 = new int[]{-16777216, -16777216, -16777216, -16777216, -16777216, -16777216, -16777216, -16777216};
          int k = aint.length;
  
          for (int l = 0; l < 16; ++l) {
              System.arraycopy(l < k ? aint : aint1, 0, missingTextureData, 16 * l, k);
              System.arraycopy(l < k ? aint1 : aint, 0, missingTextureData, 16 * l + k, k);
          }
  
          missingTexture.updateDynamicTexture();
          mipmapBuffer = new int[4];
      }
  }
  