Map AHARDWAREBUFFER_FORMAT_R8_UNORM to GL_R8

Bug: b/259551816
Test: cvd start --gpu_mode=guest_swiftshader
Test: atest librenderengine_test
Change-Id: I874278fe50dd1b501c11c484c55ed91e67a7013b
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4034130
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>

src/common/android_util.cpp

@@ -192,6 +192,15 @@ enum {
 
 #endif  // ANGLE_AHARDWARE_BUFFER_SUPPORT
 
+#if !defined(ANGLE_AHARDWARE_BUFFER_SUPPORT) || __ANDROID_API__ < 33
+    /**
+     * Corresponding formats:
+     *   Vulkan: VK_FORMAT_R8_UNORM
+     *   OpenGL ES: GR_GL_R8
+     */
+    AHARDWAREBUFFER_FORMAT_R8_UNORM                 = 0x38,
+#endif
+
     AHARDWAREBUFFER_FORMAT_YV12                     = 0x32315659,
     AHARDWAREBUFFER_FORMAT_IMPLEMENTATION_DEFINED   = 0x22,
 };
@@ -257,6 +266,8 @@ GLenum GetPixelFormatInfo(int pixelFormat, bool *isYUV)
             return GL_DEPTH32F_STENCIL8;
         case AHARDWAREBUFFER_FORMAT_S8_UINT:
             return GL_STENCIL_INDEX8;
+        case AHARDWAREBUFFER_FORMAT_R8_UNORM:
+            return GL_R8;
         case AHARDWAREBUFFER_FORMAT_Y8Cb8Cr8_420:
         case AHARDWAREBUFFER_FORMAT_YV12:
         case AHARDWAREBUFFER_FORMAT_IMPLEMENTATION_DEFINED:
@@ -358,6 +369,8 @@ int GLInternalFormatToNativePixelFormat(GLenum internalFormat)
 {
     switch (internalFormat)
     {
+        case GL_R8:
+            return AHARDWAREBUFFER_FORMAT_R8_UNORM;
         case GL_RGBA8:
             return AHARDWAREBUFFER_FORMAT_R8G8B8A8_UNORM;
         case GL_RGB8: