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This commit is contained in:
Edward R. Gonzalez
2026-07-07 01:22:09 -04:00
parent 93bab89f76
commit 6eee0249ff
5 changed files with 127 additions and 74 deletions
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code/gte_hello/hello_gte.c
+3 -3
View File
@@ -259,7 +259,7 @@ void update(PrimitiveArena* pa, U4* ordering_buf)
tb_emit(& tb, code_cube_tri);
}
tb_emit(& tb, code_sync_prim_cursor);
tb_emit(& tb, code_sync_primitive_arena);
tb_data(& tb, u4_(& pa->used));
tb_data(& tb, prim_base);
}
@@ -351,8 +351,8 @@ void update(PrimitiveArena* pa, U4* ordering_buf)
for (U4 i = 0; i < Floor_num_faces; i++) {
tb_emit(& tb, code_floor_tri);
}
tb_emit(& tb, code_sync_prim_cursor);
// After code_floor_tri iterations complete, the primitive arena's used counter is wrong.
tb_emit(& tb, code_sync_primitive_arena);
tb_data(& tb, u4_(& pa->used));
tb_data(& tb, prim_base);
}
code/gte_hello/hello_gte_tape.c
+22 -4
View File
@@ -27,8 +27,8 @@
atom_group( floor_tri, GROUP_RENDER_FLOOR)
atom_cadence(floor_tri, CADENCE_FRAME)
atom_annot( floor_tri, phase_work,
tape_regs(R_PrimCursor, R_FaceCursor, R_VertBase, R_OtBase),
tape_regs(R_PrimCursor, R_FaceCursor))
atom_reads( R_PrimCursor, R_FaceCursor, R_VertBase, R_OtBase),
atom_writes(R_PrimCursor, R_FaceCursor))
internal
MipsAtom_(floor_tri) {
// T0-T2 allocated
@@ -69,11 +69,29 @@ MipsAtom_(floor_tri) {
/* 8. Insert into Ordering Table Linked List */
mac_insert_ot_tag(R_T1, 0x0400),
add_ui(R_PrimCursor, R_PrimCursor, S_(Poly_F3)), /* Advance Prim Cursor (5 words) */
add_ui_1(R_PrimCursor, S_(Poly_F3)), /* Advance Prim Cursor (5 words) */
// Note(Ed): No bounds checking, should be checked before atom runs.
/* 9. Advance Input Cursor & Yield (Both branch targets land here) */
atom_label(floor_tri_exit)
add_ui(R_FaceCursor, R_FaceCursor, S_(S2) * 4), /* Advance Face Cursor (4 * S2 = 8 bytes) */
add_ui_1(R_FaceCursor, S_(S2) * 4), /* Advance Face Cursor (4 * S2 = 8 bytes) */
mac_yield()
};
typedef Struct_(Binds_SyncPrimitiveArena) { U4 PrimtiveArena_Used; U4 PrimtiveBase; };
atom_region( sync_primitive_arena, REGION_PRIM_ARENA)
atom_group( sync_primitive_arena, GROUP_RENDER_FLOOR)
atom_cadence(sync_primitive_arena, CADENCE_FRAME)
atom_annot( sync_primitive_arena, phase_work,
atom_reads( R_TapePtr, R_PrimCursor),
atom_writes(R_TapePtr))
internal MipsAtom_(sync_primitive_arena) {
load_word(R_AT, R_TapePtr, O_(Binds_SyncPrimitiveArena,PrimtiveArena_Used)),
load_word(R_T0, R_TapePtr, O_(Binds_SyncPrimitiveArena,PrimtiveBase)),
add_ui_1( R_TapePtr, S_(Binds_SyncPrimitiveArena)),
/* Calculate byte offset and store directly back to RAM */
sub_u( R_T0, R_PrimCursor, R_T0), // R_T0 = R_PrimCursor - prim-base
store_word(R_T0, R_AT, 0), // R_AT[0] = R_T0
mac_yield()
};