message: use glClear instead of glInvalidateFrambuffer on desktop
  glInvalidateFramebuffer is not available before GL4.3.
diff: @@ -2232,6 +2232,13 @@ void OpenGLDriver::beginRenderPass(Handle<HwRenderTarget> rth,
  }
  CHECK_GL_ERROR(utils::slog.e)
  }
  + } else {
  + // on GL desktop we assume we don't have glInvalidateFramebuffer, but even if the GPU is
  + // not a tiler, it's important to clear the framebuffer before drawing, as it resets
  + // the fb to a known state (resets fb compression and possibly other things).
  + // So we use glClear instead of glInvalidateFramebuffer
  + gl.disable(GL_SCISSOR_TEST);
  + clearWithRasterPipe(discardFlags & ~clearFlags, { 0.0f }, 0.0f, 0);
  }
  if (rt->gl.fbo_read) {
  @@ -2262,8 +2269,7 @@ void OpenGLDriver::beginRenderPass(Handle<HwRenderTarget> rth,
  #ifndef NDEBUG
  // clear the discarded (but not the cleared ones) buffers in debug builds
  - mContext.bindFramebuffer(GL_FRAMEBUFFER, rt->gl.fbo);
  - mContext.disable(GL_SCISSOR_TEST);
  + gl.disable(GL_SCISSOR_TEST);
  clearWithRasterPipe(discardFlags & ~clearFlags,
  { 1, 0, 0, 1 }, 1.0, 0);
  #endif
  