GL: Move loadAsset to GlProgram, where it's used.

(Also, make some public methods private)

PiperOrigin-RevId: 481912071
(cherry picked from commit a404fde4)

library/common/src/main/java/com/google/android/exoplayer2/util/GlProgram.java

@@ -22,6 +22,7 @@ import android.opengl.GLES11Ext;
 import android.opengl.GLES20;
 import androidx.annotation.Nullable;
 import java.io.IOException;
+import java.io.InputStream;
 import java.nio.Buffer;
 import java.util.HashMap;
 import java.util.Map;
@@ -54,9 +55,25 @@ public final class GlProgram {
    */
   public GlProgram(Context context, String vertexShaderFilePath, String fragmentShaderFilePath)
       throws IOException, GlUtil.GlException {
-    this(
-        GlUtil.loadAsset(context, vertexShaderFilePath),
-        GlUtil.loadAsset(context, fragmentShaderFilePath));
+    this(loadAsset(context, vertexShaderFilePath), loadAsset(context, fragmentShaderFilePath));
+  }
+
+  /**
+   * Loads a file from the assets folder.
+   *
+   * @param context The {@link Context}.
+   * @param assetPath The path to the file to load, from the assets folder.
+   * @return The content of the file to load.
+   * @throws IOException If the file couldn't be read.
+   */
+  public static String loadAsset(Context context, String assetPath) throws IOException {
+    @Nullable InputStream inputStream = null;
+    try {
+      inputStream = context.getAssets().open(assetPath);
+      return Util.fromUtf8Bytes(Util.toByteArray(inputStream));
+    } finally {
+      Util.closeQuietly(inputStream);
+    }
   }
 
   /**

library/common/src/main/java/com/google/android/exoplayer2/util/GlUtil.java

@@ -32,8 +32,6 @@ import androidx.annotation.DoNotInline;
 import androidx.annotation.Nullable;
 import androidx.annotation.RequiresApi;
 import com.google.android.exoplayer2.C;
-import java.io.IOException;
-import java.io.InputStream;
 import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
 import java.nio.FloatBuffer;
@@ -58,8 +56,6 @@ public final class GlUtil {
   /** Length of the normalized device coordinate (NDC) space, which spans from -1 to 1. */
   public static final float LENGTH_NDC = 2f;
 
-  private static final String TAG = "GlUtil";
-
   // https://www.khronos.org/registry/EGL/extensions/EXT/EGL_EXT_protected_content.txt
   private static final String EXTENSION_PROTECTED_CONTENT = "EGL_EXT_protected_content";
   // https://www.khronos.org/registry/EGL/extensions/KHR/EGL_KHR_surfaceless_context.txt
@@ -351,7 +347,7 @@ public final class GlUtil {
    * @param height The height for a texture.
    * @throws GlException If the texture width or height is invalid.
    */
-  public static void assertValidTextureSize(int width, int height) throws GlException {
+  private static void assertValidTextureSize(int width, int height) throws GlException {
     // TODO(b/201293185): Consider handling adjustments for sizes > GL_MAX_TEXTURE_SIZE
     //  (ex. downscaling appropriately) in a texture processor instead of asserting incorrect
     //  values.
@@ -459,30 +455,12 @@ public final class GlUtil {
    *
    * @param capacity The new buffer's capacity, in floats.
    */
-  public static FloatBuffer createBuffer(int capacity) {
+  private static FloatBuffer createBuffer(int capacity) {
     ByteBuffer byteBuffer = ByteBuffer.allocateDirect(capacity * C.BYTES_PER_FLOAT);
     return byteBuffer.order(ByteOrder.nativeOrder()).asFloatBuffer();
   }
 
   /**
-   * Loads a file from the assets folder.
-   *
-   * @param context The {@link Context}.
-   * @param assetPath The path to the file to load, from the assets folder.
-   * @return The content of the file to load.
-   * @throws IOException If the file couldn't be read.
-   */
-  public static String loadAsset(Context context, String assetPath) throws IOException {
-    @Nullable InputStream inputStream = null;
-    try {
-      inputStream = context.getAssets().open(assetPath);
-      return Util.fromUtf8Bytes(Util.toByteArray(inputStream));
-    } finally {
-      Util.closeQuietly(inputStream);
-    }
-  }
-
-  /**
    * Creates a GL_TEXTURE_EXTERNAL_OES with default configuration of GL_LINEAR filtering and
    * GL_CLAMP_TO_EDGE wrapping.
    */