Robert Allan James
ef9806977a
Adds Module 28 (framebuffer_words.c/.h): PLOT ( x y color -- ), FB-WIDTH, FB-HEIGHT -- raw hardware-boundary C primitives, kernel-only, no-op on hosted builds, same pattern as every other module. Adds capsules/fabric.4th (blocks 4900-4902, mkcapsule --lint clean): COS45/Z->DELTA/PROJECT/CART-Y/CART-PLOT -- the 45-degree cavalier orthographic projection and Y-flip, in FORTH per the compose-in-FORTH-first rule (this is policy, not hardware access). Found and fixed a second real bug while live-testing CART-PLOT over the serial socket: defining_word_variable() (defining_words.c) captured vm->here as a VARIABLE's address with no alignment call first, while vm_load_cell/vm_store_cell require 8-byte-aligned addresses. This capsule's VARIABLE ZD landed misaligned (945) purely by chance of what preceded it; other capsules' variables happened to land aligned by luck, not guarantee. Real deviation from FORTH-83/ANS, which specifies VARIABLE reserves an aligned cell. Fixed with vm_align(vm) before capturing addr -- ALIGN already existed as a word but VARIABLE wasn't calling it. Verified end-to-end on amd64 via manual serial injection + QEMU screendump: plotted 4 marker points (origin, +100 X, +100 Y, +50 Z) and confirmed all landed at hand-calculated raster coordinates, including the diagonal up-right shift for the Z-axis point -- the projection math is correct, not just non-crashing. fb/fabric-test-cart-plot.png. 4.3.1's corner diagnostic still renders correctly in the same shot, confirming no regression. All three architectures (amd64/aarch64/riscv64) boot clean to ok> with the DoE completing; dict_hash identical across all three (0xc7f9adf885e306d2), confirming parity is unaffected. FABRIC.md item 4.3.3 marked done with full acceptance evidence.
lfs/
Per-architecture copies of the hosted starforth binary. The hosted
Makefile copies the freshly built binary here as its last build step
(cp $(BINARY) lfs/$(ARCH_DIR)/starforth), separate from
build/<arch>/<profile>/, which is the working build-output tree.
amd64/starforth,arm64/starforth,riscv64/starforth— one binary per architecture, rebuilt whenever that architecture's hosted build runs.