libgdx/libgdx · error · GdxRuntimeException

glGetFramebufferAttachmentParameteriv Invalid enum for WebGL

Error message

glGetFramebufferAttachmentParameteriv Invalid enum for WebGL backend.

What it means

Error "glGetFramebufferAttachmentParameteriv Invalid enum for WebGL backend." thrown in libgdx/libgdx.

Source

Thrown at backends/gdx-backends-gwt/src/com/badlogic/gdx/backends/gwt/GwtGL20.java:658

	public void glGetFramebufferAttachmentParameteriv (int target, int attachment, int pname, IntBuffer params) {
		switch (pname) {
		case GL20.GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE:
		case GL20.GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL:
		case GL20.GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE:
			params.put(0, gl.getFramebufferAttachmentParameteri(target, attachment, pname));
			params.flip();
			break;
		case GL20.GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME:
			WebGLTexture tex = gl.getParametero(pname);
			if (tex == null) {
				params.put(0);
			} else {
				params.put(textures.getKey(tex));
			}
			params.flip();
			return;
		default:
			throw new GdxRuntimeException("glGetFramebufferAttachmentParameteriv Invalid enum for WebGL backend.");
		}
	}

	@Override
	public void glGetIntegerv (int pname, IntBuffer params) {
		if (pname == GL20.GL_ACTIVE_TEXTURE || pname == GL20.GL_ALPHA_BITS || pname == GL20.GL_BLEND_DST_ALPHA
			|| pname == GL20.GL_BLEND_DST_RGB || pname == GL20.GL_BLEND_EQUATION_ALPHA || pname == GL20.GL_BLEND_EQUATION_RGB
			|| pname == GL20.GL_BLEND_SRC_ALPHA || pname == GL20.GL_BLEND_SRC_RGB || pname == GL20.GL_BLUE_BITS
			|| pname == GL20.GL_CULL_FACE_MODE || pname == GL20.GL_DEPTH_BITS || pname == GL20.GL_DEPTH_FUNC
			|| pname == GL20.GL_FRONT_FACE || pname == GL20.GL_GENERATE_MIPMAP_HINT || pname == GL20.GL_GREEN_BITS
			|| pname == GL20.GL_IMPLEMENTATION_COLOR_READ_FORMAT || pname == GL20.GL_IMPLEMENTATION_COLOR_READ_TYPE
			|| pname == GL20.GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS || pname == GL20.GL_MAX_CUBE_MAP_TEXTURE_SIZE
			|| pname == GL20.GL_MAX_FRAGMENT_UNIFORM_VECTORS || pname == GL20.GL_MAX_RENDERBUFFER_SIZE
			|| pname == GL20.GL_MAX_TEXTURE_IMAGE_UNITS || pname == GL20.GL_MAX_TEXTURE_SIZE || pname == GL20.GL_MAX_VARYING_VECTORS
			|| pname == GL20.GL_MAX_VERTEX_ATTRIBS || pname == GL20.GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS
			|| pname == GL20.GL_MAX_VERTEX_UNIFORM_VECTORS || pname == GL20.GL_NUM_COMPRESSED_TEXTURE_FORMATS
			|| pname == GL20.GL_PACK_ALIGNMENT || pname == GL20.GL_RED_BITS || pname == GL20.GL_SAMPLE_BUFFERS
			|| pname == GL20.GL_SAMPLES || pname == GL20.GL_STENCIL_BACK_FAIL || pname == GL20.GL_STENCIL_BACK_FUNC

View on GitHub (pinned to 97f4086187)

Solutions

1. Only pass enums accepted by WebGL for glGetFramebufferAttachmentParameteriv (e.g. FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE/NAME/TEXTURE_LEVEL/TEXTURE_CUBE_MAP_FACE); other GL enums are invalid on WebGL.

When it happens

Trigger: Thrown at backends/gdx-backends-gwt/src/com/badlogic/gdx/backends/gwt/GwtGL20.java:658 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of libgdx/libgdx@97f4086187 (2026-08-14). Data as JSON: /api/errors/d00766be5362e1b1. Report an issue: GitHub.