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triangle spotted (not yellow!)

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This commit is contained in:
Edward R. Gonzalez
2026-06-14 19:53:00 -04:00
parent 2e4912b1e2
commit c4e25daa9b
2 changed files with 15 additions and 27 deletions
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code/duffle/lottes_tape.h
+9 -16
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@@ -25,7 +25,7 @@ typedef Slice_(U4);
FI_ void tape_run(Slice_U4 tape, B1** r_prim_cursor, void* face_cursor, void* vert_base, void* ot_base) {
register U4* tp rgcc(R_TP) = tape.ptr;
register B1* pcur rgcc(R_T7) = *r_prim_cursor;
register B1* pcur rgcc(R_T7) = r_prim_cursor[0];
register void* r_t4 rgcc(R_T4) = face_cursor;
register void* r_t5 rgcc(R_T5) = vert_base;
register void* r_t6 rgcc(R_T6) = ot_base;
@@ -42,15 +42,13 @@ FI_ void tape_run(Slice_U4 tape, B1** r_prim_cursor, void* face_cursor, void* ve
: "at", "v0", "v1", "t0", "t1", "t2", "t3", "t9", "memory"
);
*r_prim_cursor = pcur;
r_prim_cursor[0] = pcur;
}
/* Custom TapeBuilder that bypasses FArena to guarantee tightly packed U4s */
typedef Struct_(TapeBuilder) { U4* ptr; U4 count; };
FI_ TapeBuilder tb_begin(FArena* arena) { return (TapeBuilder){ (U4*)arena->start, 0 }; }
I_ void tb_emit(TapeBuilder* tb, Code* atom) { r_(tb->ptr)[tb->count] = u4_(atom); ++ tb->count; }
I_ Slice_U4 tb_end(TapeBuilder* tb) {
tb_emit(tb, code_tape_exit);
return (Slice_U4){ tb->ptr, tb->count };
@@ -154,33 +152,28 @@ internal Code CodeBlob_(atom_diag_yield) {
/* DIAGNOSTIC 2: Pure memory test (No GTE). Draws a fixed cyan triangle. */
internal Code CodeBlob_(atom_diag_color) {
/* 1. Store Primitive Data (Code 0x20, Cyan color) */
store_word(R_0, R_T7, 0),
load_ui(R_AT, 0x2000),
or_i(R_AT, R_AT, 0xFFFF),
store_word(R_AT, R_T7, 4),
/* 2. Fake coordinates */
load_ui(R_AT, 0x0010), or_i(R_AT, R_AT, 0x0010), store_word(R_AT, R_T7, 8),
load_ui(R_AT, 0x0010), or_i(R_AT, R_AT, 0x0050), store_word(R_AT, R_T7, 12),
load_ui(R_AT, 0x0050), or_i(R_AT, R_AT, 0x0010), store_word(R_AT, R_T7, 16),
/* Fake coordinates - Swapped winding order to prevent GPU culling! */
load_ui(R_AT, 0x0010), or_i(R_AT, R_AT, 0x0010), store_word(R_AT, R_T7, 8), /* (16, 16) */
load_ui(R_AT, 0x0050), or_i(R_AT, R_AT, 0x0010), store_word(R_AT, R_T7, 12), /* (80, 16) */
load_ui(R_AT, 0x0010), or_i(R_AT, R_AT, 0x0050), store_word(R_AT, R_T7, 16), /* (16, 80) */
/* 3. Link to Ordering Table at fixed depth (10) */
add_ui(R_T1, R_0, 10), /* <--- FIXED: Use add_ui for small constants! */
add_ui(R_T1, R_0, 10),
shift_ll(R_T1, R_T1, 2),
add_u(R_T1, R_T1, R_T6),
load_word(R_AT, R_T1, 0),
load_ui(R_V0, 0x0400),
store_word(R_AT, R_T7, 0),
shift_ll(R_AT, R_T7, 8),
shift_lr(R_AT, R_AT, 8),
load_ui(R_V0, 0x0400),
shift_ll(R_AT, R_T7, 8), shift_lr(R_AT, R_AT, 8),
or_u(R_AT, R_AT, R_V0),
store_word(R_AT, R_T1, 0),
/* 4. Advance Prim Cursor and Yield */
add_ui(R_T7, R_T7, 20),
mips_yield
};