Problem adding a custom RenderTarget

[RockVampire]

I have a custom RenderTarget build with a Texture I create outside. I set the RenderTarget into the View ,and my swapchain is a headless swapchain that I created with width and height.
I got crash and log on Android like this :

2021-07-29 21:17:54.677 23495-23631/ E/Filament: KHR_debug PERFORMANCE: Packing allocations for resource %p
2021-07-29 21:17:54.678 23495-23631/ E/Filament: OpenGL framebuffer error 0x8cd7 (GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT) in "void filament::OpenGLDriver::framebufferTexture(const backend::TargetBufferInfo &, const filament::OpenGLDriver::GLRenderTarget *, GLenum)" at line 1059
2021-07-29 21:17:54.679 23495-23631/ E/Filament: OpenGL framebuffer error 0x8cd7 (GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT) in "void filament::OpenGLDriver::framebufferTexture(const backend::TargetBufferInfo &, const filament::OpenGLDriver::GLRenderTarget *, GLenum)" at line 1059
2021-07-29 21:17:54.681 23495-23631/ E/Filament: KHR_debug PERFORMANCE: Packing allocations for resource %p
2021-07-29 21:17:54.708 23495-23631/ E/Filament: KHR_debug PERFORMANCE: Packing allocations for resource %p
2021-07-29 21:17:54.719 23495-23631/ E/Filament: KHR_debug PERFORMANCE: Packing allocations for resource %p
2021-07-29 21:17:54.729 23495-23631/E/Filament: KHR_debug PERFORMANCE: Packing allocations for resource %p
2021-07-29 21:17:54.756 23495-23631 E/Filament: KHR_debug PERFORMANCE: Packing allocations for resource %p
2021-07-29 21:17:54.765 23495-23631/ E/Filament: KHR_debug PERFORMANCE: Packing allocations for resource %p
2021-07-29 21:17:54.768 23495-23631/ E/Filament: KHR_debug PERFORMANCE: Packing allocations for resource %p
2021-07-29 21:17:54.798 23495-23631/ E/Filament: KHR_debug PERFORMANCE: Packing allocations for resource %p
2021-07-29 21:17:54.809 23495-23631/ E/Filament: KHR_debug PERFORMANCE: Packing allocations for resource %p
2021-07-29 21:17:54.817 23495-23631/ E/Filament: KHR_debug PERFORMANCE: FreeAllocationOnTimestamp - WaitForTimestamp
2021-07-29 21:17:54.817 23495-23631/ E/Filament: KHR_debug PERFORMANCE: FreeAllocationOnTimestamp - WaitForTimestamp
2021-07-29 21:17:54.817 23495-23631/ E/Filament: KHR_debug PERFORMANCE: EsxBufferObject::Map - Ignoring EsxBufferMapUnsyncedBit
2021-07-29 21:17:54.822 23495-23631/ E/Filament: KHR_debug PERFORMANCE: FreeAllocationOnTimestamp - WaitForTimestamp
2021-07-29 21:17:54.937 23495-23631/ E/Filament: KHR_debug PERFORMANCE: FreeAllocationOnTimestamp - WaitForTimestamp
2021-07-29 21:17:54.937 23495-23631/ E/Filament: KHR_debug PERFORMANCE: FreeAllocationOnTimestamp - WaitForTimestamp
2021-07-29 21:17:54.979 23495-23631/ E/Filament: KHR_debug PERFORMANCE: FreeAllocationOnTimestamp - WaitForTimestamp
2021-07-29 21:17:54.979 23495-23631/ E/Filament: KHR_debug PERFORMANCE: EsxBufferObject::Map - Ignoring EsxBufferMapUnsyncedBit
2021-07-29 21:17:54.979 23495-23631/ E/Filament: KHR_debug PERFORMANCE: FreeAllocationOnTimestamp - WaitForTimestamp
2021-07-29 21:17:54.981 23495-23631/ E/Filament: KHR_debug PERFORMANCE: FreeAllocationOnTimestamp - WaitForTimestamp
2021-07-29 21:17:54.981 23495-23631/ E/Filament: KHR_debug PERFORMANCE: FreeAllocationOnTimestamp - WaitForTimestamp
2021-07-29 21:17:54.981 23495-23631/ E/Filament: OpenGL framebuffer error 0x8cd7 (GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT) in "void filament::OpenGLDriver::beginRenderPass(Handle<filament::backend::HwRenderTarget>, const filament::backend::RenderPassParams &)" at line 2320
2021-07-29 21:17:54.981 23495-23631/ E/Filament: KHR_debug ERROR: the draw framebuffer is not framebuffer complete
2021-07-29 21:17:54.981 23495-23631/ E/Filament: OpenGL error 0x506 (GL_INVALID_FRAMEBUFFER_OPERATION) in "void filament::OpenGLDriver::clearWithRasterPipe(filament::backend::TargetBufferFlags, const math::float4 &, GLfloat, GLint)" at line 3116

Is there any suggestion? Thanks a lot!!

[romainguy]

Could you please show your code?

[romainguy]

SurfaceTexture is a better solution. You would create a SurfaceTexture with a texture id created in your GL context and use the SurfaceTexture's Surface on the Filament side as the swap chain (you can also do the opposite and consume a SurfaceTexture in Filament which is what SceneForm does). If you look at UiHelper, rendering into a SurfaceTexture's Surface is what we do to handle TextureView.

[RockVampire]

Thanks for answering.Hope you enjoyed a funny weekend.
I tried to Render on a SurfaceTexture again , and succeed finally. The problem before is the other sdk I used bind the External_Texture already . So , when I want to use a SurfaceTexture I must unbind/rebind the External_Texture.
But I'm facing another problem now. When I'm using SurfaceTexture to render something , I always got it with a "red background".It seems like the alpha channel comes invalidation whether I got the result from Renderer->readPixel or from the texture.
I use the flag SwapChain.CONFIG_TRANSPARENT to create the SwapChain . And I also tried to add

        GLES20.glEnable(GLES11.GL_BLEND);
        GLES20.glBlendFunc(GLES11.GL_SRC_ALPHA, GLES11.GL_ONE_MINUS_SRC_ALPHA);

when generating the texture. They all disappointed me.
Do you have any idea?

[RockVampire]

Strangely, I also tried to add a skybox the skybox doesn't take effect, and the 'red background' turns pink.Is it clue for something wrong?

[RockVampire]

SurfaceTexture is a better solution. You would create a SurfaceTexture with a texture id created in your GL context and use the SurfaceTexture's Surface on the Filament side as the swap chain (you can also do the opposite and consume a SurfaceTexture in Filament which is what SceneForm does). If you look at UiHelper, rendering into a SurfaceTexture's Surface is what we do to handle TextureView.

Does anything different I should config it manual？I got trouble in rendering transparent.

[RockVampire]

SurfaceTexture is a better solution. You would create a SurfaceTexture with a texture id created in your GL context and use the SurfaceTexture's Surface on the Filament side as the swap chain (you can also do the opposite and consume a SurfaceTexture in Filament which is what SceneForm does). If you look at UiHelper, rendering into a SurfaceTexture's Surface is what we do to handle TextureView.

Finally, I got what I want. Thanks for all your answering!