diff --git a/demos/gl/src/main/java/androidx/media3/demo/gl/BitmapOverlayVideoProcessor.java b/demos/gl/src/main/java/androidx/media3/demo/gl/BitmapOverlayVideoProcessor.java
index a9329b5343..735abf4cfa 100644
--- a/demos/gl/src/main/java/androidx/media3/demo/gl/BitmapOverlayVideoProcessor.java
+++ b/demos/gl/src/main/java/androidx/media3/demo/gl/BitmapOverlayVideoProcessor.java
@@ -87,9 +87,13 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
       throw new IllegalStateException(e);
     }
     program.setBufferAttribute(
-        "aFramePosition", GlUtil.getNormalizedCoordinateBounds(), GlUtil.RECTANGLE_VERTICES_COUNT);
+        "aFramePosition",
+        GlUtil.getNormalizedCoordinateBounds(),
+        GlUtil.HOMOGENEOUS_COORDINATE_VECTOR_SIZE);
     program.setBufferAttribute(
-        "aTexCoords", GlUtil.getTextureCoordinateBounds(), GlUtil.RECTANGLE_VERTICES_COUNT);
+        "aTexCoords",
+        GlUtil.getTextureCoordinateBounds(),
+        GlUtil.HOMOGENEOUS_COORDINATE_VECTOR_SIZE);
     GLES20.glGenTextures(1, textures, 0);
     GLES20.glBindTexture(GL10.GL_TEXTURE_2D, textures[0]);
     GLES20.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_NEAREST);
diff --git a/demos/transformer/src/main/java/androidx/media3/demo/transformer/BitmapOverlayFrameProcessor.java b/demos/transformer/src/main/java/androidx/media3/demo/transformer/BitmapOverlayFrameProcessor.java
index c6cd2c39ec..e4eba6e3bf 100644
--- a/demos/transformer/src/main/java/androidx/media3/demo/transformer/BitmapOverlayFrameProcessor.java
+++ b/demos/transformer/src/main/java/androidx/media3/demo/transformer/BitmapOverlayFrameProcessor.java
@@ -101,7 +101,9 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
     glProgram = new GlProgram(context, VERTEX_SHADER_PATH, FRAGMENT_SHADER_PATH);
     // Draw the frame on the entire normalized device coordinate space, from -1 to 1, for x and y.
     glProgram.setBufferAttribute(
-        "aFramePosition", GlUtil.getNormalizedCoordinateBounds(), GlUtil.RECTANGLE_VERTICES_COUNT);
+        "aFramePosition",
+        GlUtil.getNormalizedCoordinateBounds(),
+        GlUtil.HOMOGENEOUS_COORDINATE_VECTOR_SIZE);
     glProgram.setSamplerTexIdUniform("uTexSampler0", inputTexId, /* texUnitIndex= */ 0);
     glProgram.setSamplerTexIdUniform("uTexSampler1", bitmapTexId, /* texUnitIndex= */ 1);
     glProgram.setFloatUniform("uScaleX", bitmapScaleX);
diff --git a/demos/transformer/src/main/java/androidx/media3/demo/transformer/PeriodicVignetteFrameProcessor.java b/demos/transformer/src/main/java/androidx/media3/demo/transformer/PeriodicVignetteFrameProcessor.java
index 6d4ff4289c..760c681d97 100644
--- a/demos/transformer/src/main/java/androidx/media3/demo/transformer/PeriodicVignetteFrameProcessor.java
+++ b/demos/transformer/src/main/java/androidx/media3/demo/transformer/PeriodicVignetteFrameProcessor.java
@@ -87,7 +87,9 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
     glProgram.setFloatsUniform("uOuterRadius", new float[] {outerRadius});
     // Draw the frame on the entire normalized device coordinate space, from -1 to 1, for x and y.
     glProgram.setBufferAttribute(
-        "aFramePosition", GlUtil.getNormalizedCoordinateBounds(), GlUtil.RECTANGLE_VERTICES_COUNT);
+        "aFramePosition",
+        GlUtil.getNormalizedCoordinateBounds(),
+        GlUtil.HOMOGENEOUS_COORDINATE_VECTOR_SIZE);
   }
 
   @Override
diff --git a/demos/transformer/src/withMediaPipe/java/androidx/media3/demo/transformer/MediaPipeFrameProcessor.java b/demos/transformer/src/withMediaPipe/java/androidx/media3/demo/transformer/MediaPipeFrameProcessor.java
index 08e069fbd9..163fa91cad 100644
--- a/demos/transformer/src/withMediaPipe/java/androidx/media3/demo/transformer/MediaPipeFrameProcessor.java
+++ b/demos/transformer/src/withMediaPipe/java/androidx/media3/demo/transformer/MediaPipeFrameProcessor.java
@@ -144,7 +144,7 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
       glProgram.setBufferAttribute(
           "aFramePosition",
           GlUtil.getNormalizedCoordinateBounds(),
-          GlUtil.RECTANGLE_VERTICES_COUNT);
+          GlUtil.HOMOGENEOUS_COORDINATE_VECTOR_SIZE);
       glProgram.bindAttributesAndUniforms();
       GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, /* first= */ 0, /* count= */ 4);
       GlUtil.checkGlError();
diff --git a/libraries/common/src/main/java/androidx/media3/common/util/GlUtil.java b/libraries/common/src/main/java/androidx/media3/common/util/GlUtil.java
index b3f55812fb..a28bca30f0 100644
--- a/libraries/common/src/main/java/androidx/media3/common/util/GlUtil.java
+++ b/libraries/common/src/main/java/androidx/media3/common/util/GlUtil.java
@@ -53,8 +53,8 @@ public final class GlUtil {
   /** Whether to throw a {@link GlException} in case of an OpenGL error. */
   public static boolean glAssertionsEnabled = false;
 
-  /** Number of vertices in a rectangle. */
-  public static final int RECTANGLE_VERTICES_COUNT = 4;
+  /** Number of elements in a 3d homogeneous coordinate vector describing a vertex. */
+  public static final int HOMOGENEOUS_COORDINATE_VECTOR_SIZE = 4;
 
   /** Length of the normalized device coordinate (NDC) space, which spans from -1 to 1. */
   public static final float LENGTH_NDC = 2f;
diff --git a/libraries/transformer/src/main/java/androidx/media3/transformer/ExternalCopyFrameProcessor.java b/libraries/transformer/src/main/java/androidx/media3/transformer/ExternalCopyFrameProcessor.java
index dcd5bcb463..05b291512e 100644
--- a/libraries/transformer/src/main/java/androidx/media3/transformer/ExternalCopyFrameProcessor.java
+++ b/libraries/transformer/src/main/java/androidx/media3/transformer/ExternalCopyFrameProcessor.java
@@ -77,7 +77,9 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
     glProgram.setSamplerTexIdUniform("uTexSampler", inputTexId, /* texUnitIndex= */ 0);
     // Draw the frame on the entire normalized device coordinate space, from -1 to 1, for x and y.
     glProgram.setBufferAttribute(
-        "aFramePosition", GlUtil.getNormalizedCoordinateBounds(), GlUtil.RECTANGLE_VERTICES_COUNT);
+        "aFramePosition",
+        GlUtil.getNormalizedCoordinateBounds(),
+        GlUtil.HOMOGENEOUS_COORDINATE_VECTOR_SIZE);
     if (enableExperimentalHdrEditing) {
       // In HDR editing mode the decoder output is sampled in YUV.
       glProgram.setFloatsUniform("uColorTransform", MATRIX_YUV_TO_BT2020_COLOR_TRANSFORM);
diff --git a/libraries/transformer/src/main/java/androidx/media3/transformer/MatrixTransformationFrameProcessor.java b/libraries/transformer/src/main/java/androidx/media3/transformer/MatrixTransformationFrameProcessor.java
index b81dd74da8..48f53dbcc6 100644
--- a/libraries/transformer/src/main/java/androidx/media3/transformer/MatrixTransformationFrameProcessor.java
+++ b/libraries/transformer/src/main/java/androidx/media3/transformer/MatrixTransformationFrameProcessor.java
@@ -86,7 +86,9 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
     glProgram.setSamplerTexIdUniform("uTexSampler", inputTexId, /* texUnitIndex= */ 0);
     // Draw the frame on the entire normalized device coordinate space, from -1 to 1, for x and y.
     glProgram.setBufferAttribute(
-        "aFramePosition", GlUtil.getNormalizedCoordinateBounds(), GlUtil.RECTANGLE_VERTICES_COUNT);
+        "aFramePosition",
+        GlUtil.getNormalizedCoordinateBounds(),
+        GlUtil.HOMOGENEOUS_COORDINATE_VECTOR_SIZE);
   }
 
   @Override