Method draw

src/main/java/field/graphics/FBO.java:431–554

()

        try (Util.ExceptionlessAutoClosable st = GraphicsContext.getContext().stateTracker.save()) {

            State s = GraphicsContext.get(this, this::setup);

            GraphicsContext.checkError(() -> "prior to fbo");
            GraphicsContext.getContext().stateTracker.fbo.set(specification.multisample ? s.multisample : s.name);

            currentFBO.set(this);

            int[] v = {(int) viewport.x, (int) viewport.y, (int) viewport.w, (int) viewport.h};

            GraphicsContext.checkError(() -> "prior to scissor");
            GraphicsContext.getContext().stateTracker.scissor.set(v);

            GraphicsContext.checkError(() -> "prior to viewport");
            GraphicsContext.getContext().stateTracker.viewport.set(v);

            if (sbsStereoViewport) {
                GraphicsContext.getContext().stateTracker.viewport.set(v);
                GL41.glViewportIndexedf(1, viewport.x, viewport.y, viewport.w / 2, viewport.h);
                GL41.glViewportIndexedf(2, viewport.x + viewport.w / 2, viewport.y, viewport.w / 2, viewport.h);
                GL41.glScissorIndexed(0, (int) viewport.x, (int) viewport.y, (int) viewport.w, (int) viewport.h);
                GL41.glScissorIndexed(1, (int) viewport.x, (int) viewport.y, (int) viewport.w / 2, (int) viewport.h);
                GL41.glScissorIndexed(2, (int) viewport.x + (int) viewport.w / 2, (int) viewport.y, (int) viewport.w / 2, (int) viewport.h);
                glEnablei(GL_SCISSOR_TEST, 1);
                glEnablei(GL_SCISSOR_TEST, 2);
            }


            GraphicsContext.checkError(() -> "prior to debug red");
            int status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
            if (status != GL_FRAMEBUFFER_COMPLETE)
                throw new IllegalArgumentException(" bad status, " + status + " on " + s.name);

//                      else System.out.println(" FBO "+s.name+" is confirmed complete  in draw method");

            if (specification.internalFormat == GL21.GL_SRGB8_ALPHA8) {
                glEnable(GL_FRAMEBUFFER_SRGB);
            }

            if (specification.overrideTextureID != -1) {
                glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, specification.overrideTextureID, 0);
            }

            if (specification.multisample) {
                glEnable(GL_MULTISAMPLE);
            }

            if (specification.num == 1)
                glDrawBuffer(GL_COLOR_ATTACHMENT0);
            else {
//				int[] bufs = new int[specification.num];
                var bufs = ByteBuffer.allocateDirect(4 * specification.num).order(ByteOrder.nativeOrder()).asIntBuffer();
                for (int i = 0; i < bufs.capacity(); i++)
                    bufs.put(i, GL_COLOR_ATTACHMENT0 + i);

                bufs.rewind();

                GL20.glDrawBuffers(bufs);
            }