Make GL demo easier to understand

PiperOrigin-RevId: 319007693

demos/gl/src/main/assets/bitmap_overlay_video_processor_fragment.glsl

@@ -32,4 +32,3 @@ void main() {
   gl_FragColor = videoColor * (1.0 - overlayColor.a)
       + overlayColor * overlayColor.a;
 }
-

demos/gl/src/main/assets/bitmap_overlay_video_processor_vertex.glsl

@@ -11,11 +11,10 @@
 // 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 vec3 a_texcoord;
+attribute vec2 a_position;
+attribute vec2 a_texcoord;
 varying vec2 v_texcoord;
 void main() {
- gl_Position = a_position;
- v_texcoord = a_texcoord.xy;
+ gl_Position = vec4(a_position.x, a_position.y, 0, 1);
+ v_texcoord = a_texcoord;
 }
-

demos/gl/src/main/java/com/google/android/exoplayer2/gldemo/BitmapOverlayVideoProcessor.java

@@ -88,18 +88,9 @@ import javax.microedition.khronos.opengles.GL10;
     GlUtil.Uniform[] uniforms = GlUtil.getUniforms(program);
     for (GlUtil.Attribute attribute : attributes) {
       if (attribute.name.equals("a_position")) {
-        attribute.setBuffer(
-            new float[] {
-              -1.0f, -1.0f, 0.0f, 1.0f, 1.0f, -1.0f, 0.0f, 1.0f, -1.0f, 1.0f, 0.0f, 1.0f, 1.0f,
-              1.0f, 0.0f, 1.0f,
-            },
-            4);
+        attribute.setBuffer(new float[] {-1, -1, 1, -1, -1, 1, 1, 1}, 2);
       } else if (attribute.name.equals("a_texcoord")) {
-        attribute.setBuffer(
-            new float[] {
-              0.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f,
-            },
-            3);
+        attribute.setBuffer(new float[] {0, 1, 1, 1, 0, 0, 1, 0}, 2);
       }
     }
     this.attributes = attributes;

demos/gl/src/main/res/layout/main_activity.xml

@@ -27,4 +27,3 @@
     app:surface_type="none"/>
 
 </FrameLayout>
-