Switch naming convention for shaders

Switch to using sentence-case naming convention but with one character prefixes for different types.

This is a no-op change.

PiperOrigin-RevId: 417791624

library/transformer/src/main/assets/shaders/fragment_shader.glsl

@@ -13,8 +13,8 @@
 // limitations under the License.
 #extension GL_OES_EGL_image_external : require
 precision mediump float;
-uniform samplerExternalOES tex_sampler;
-varying vec2 v_texcoord;
+uniform samplerExternalOES uTexSampler;
+varying vec2 vTexCoords;
 void main() {
-  gl_FragColor = texture2D(tex_sampler, v_texcoord);
+  gl_FragColor = texture2D(uTexSampler, vTexCoords);
 }

library/transformer/src/main/assets/shaders/vertex_shader.glsl

@@ -11,12 +11,12 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
-attribute vec4 a_position;
-attribute vec4 a_texcoord;
-uniform mat4 tex_transform;
-uniform mat4 transformation_matrix;
-varying vec2 v_texcoord;
+attribute vec4 aPosition;
+attribute vec4 aTexCoords;
+uniform mat4 uTexTransform;
+uniform mat4 uTransformationMatrix;
+varying vec2 vTexCoords;
 void main() {
-  gl_Position = transformation_matrix * a_position;
-  v_texcoord = (tex_transform * a_texcoord).xy;
+  gl_Position = uTransformationMatrix * aPosition;
+  vTexCoords = (uTexTransform * aTexCoords).xy;
 }

library/transformer/src/main/java/com/google/android/exoplayer2/transformer/FrameEditor.java

@@ -74,7 +74,7 @@ import java.util.concurrent.atomic.AtomicInteger;
     }
 
     glProgram.setBufferAttribute(
-        "a_position",
+        "aPosition",
         new float[] {
           -1.0f, -1.0f, 0.0f, 1.0f,
           1.0f, -1.0f, 0.0f, 1.0f,
@@ -83,7 +83,7 @@ import java.util.concurrent.atomic.AtomicInteger;
         },
         /* size= */ 4);
     glProgram.setBufferAttribute(
-        "a_texcoord",
+        "aTexCoords",
         new float[] {
           0.0f, 0.0f, 0.0f, 1.0f,
           1.0f, 0.0f, 0.0f, 1.0f,
@@ -91,10 +91,10 @@ import java.util.concurrent.atomic.AtomicInteger;
           1.0f, 1.0f, 0.0f, 1.0f,
         },
         /* size= */ 4);
-    glProgram.setSamplerTexIdUniform("tex_sampler", textureId, /* unit= */ 0);
+    glProgram.setSamplerTexIdUniform("uTexSampler", textureId, /* unit= */ 0);
 
     float[] transformationMatrixArray = getGlMatrixArray(transformationMatrix);
-    glProgram.setFloatsUniform("transformation_matrix", transformationMatrixArray);
+    glProgram.setFloatsUniform("uTransformationMatrix", transformationMatrixArray);
 
     @Nullable
     SurfaceView debugSurfaceView =
@@ -230,7 +230,7 @@ import java.util.concurrent.atomic.AtomicInteger;
   public void processData() {
     inputSurfaceTexture.updateTexImage();
     inputSurfaceTexture.getTransformMatrix(textureTransformMatrix);
-    glProgram.setFloatsUniform("tex_transform", textureTransformMatrix);
+    glProgram.setFloatsUniform("uTexTransform", textureTransformMatrix);
     glProgram.bindAttributesAndUniforms();
 
     focusAndDrawQuad(eglSurface, outputWidth, outputHeight);