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pikuma_ps1/code/duffle/lottes_tape.h
T
ed c4e25daa9b triangle spotted (not yellow!)
2026-06-14 19:53:00 -04:00

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#ifdef INTELLISENSE_DIRECTIVES
# pragma once
# include "dsl.h"
# include "gcc_asm.h"
# include "mips.h"
# include "gte.h"
# include "memory.h"
#endif
/* R_T8 is our dedicated Tape Pointer (TP) */
#define R_TP R_T8
#define R_TP_Code R_T8_Code
/* The 'Yield' sequence for CodeBlobs */
#define mips_yield \
load_word(R_T9, R_TP, 0) \
, add_ui(R_TP, R_TP, 4) \
, jump_reg(R_T9) \
, nop
/* The 'Exit' Atom */
internal Code CodeBlob_(tape_exit) { jump_reg(rret_addr), nop };
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[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;
asm volatile(
"move $11, $31;" /* Manually save $ra to $t3 to protect against GCC bugs */
"lw $25, 0(%0);"
"addiu %0, %0, 4;"
"jalr $25;"
"nop;"
"move $31, $11;" /* Restore $ra */
: "+r"(tp), "+r"(pcur), "+r"(r_t4), "+r"(r_t5), "+r"(r_t6)
:
: "at", "v0", "v1", "t0", "t1", "t2", "t3", "t9", "memory"
);
r_prim_cursor[0] = pcur;
}
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 };
}
internal Code CodeBlob_(atom_set_gte_world) {
/* Pop matrix address from tape into R_T3 ($11) */
load_word(R_T3, R_TP, 0),
add_ui(R_TP, R_TP, 4),
/* Load 3x3 Rotation + 3x1 Translation from R_T3 into GTE CONTROL Regs (ctc2) */
load_word(R_T0, R_T3, 0), load_word(R_T1, R_T3, 4),
gte_ct(R_T0, gte_cr_RT11), gte_ct(R_T1, gte_cr_RT12),
load_word(R_T0, R_T3, 8), load_word(R_T1, R_T3, 12), load_word(R_T2, R_T3, 16),
gte_ct(R_T0, gte_cr_RT13), gte_ct(R_T1, gte_cr_RT21), gte_ct(R_T2, gte_cr_RT22),
load_word(R_T0, R_T3, 20), load_word(R_T1, R_T3, 24), load_word(R_T2, R_T3, 28),
gte_ct(R_T0, gte_cr_TRX), gte_ct(R_T1, gte_cr_TRY), gte_ct(R_T2, gte_cr_TRZ),
mips_yield
};
internal Code CodeBlob_(atom_floor_tri) {
/* 1. Load 3 indices from $t4 */
load_half_u(R_T0, R_T4, 0),
load_half_u(R_T1, R_T4, 2),
load_half_u(R_T2, R_T4, 4),
/* 2. Load Vertices: Addr = Base + (idx * 8). Write to GTE DATA Regs (mtc2) */
shift_ll(R_AT, R_T0, 3), add_u(R_AT, R_AT, R_T5),
load_word(R_V0, R_AT, 0), load_word(R_V1, R_AT, 4),
gte_mt(R_V0, C2_VXY0), gte_mt(R_V1, C2_VZ0),
shift_ll(R_AT, R_T1, 3), add_u(R_AT, R_AT, R_T5),
load_word(R_V0, R_AT, 0), load_word(R_V1, R_AT, 4),
gte_mt(R_V0, C2_VXY1), gte_mt(R_V1, C2_VZ1),
shift_ll(R_AT, R_T2, 3), add_u(R_AT, R_AT, R_T5),
load_word(R_V0, R_AT, 0), load_word(R_V1, R_AT, 4),
gte_mt(R_V0, C2_VXY2), gte_mt(R_V1, C2_VZ2),
/* 3. RTPT + NCLIP */
nop, nop, gte_cmdw_rtpt,
nop, nop, gte_cmdw_nclip,
nop, nop, /* Wait for NCLIP to finish */
/* 4. Check NCLIP.
If MAC0 <= 0 (Backface), branch to end.
Target is 28 instructions past the delay slot. */
gte_mf(R_T0, C2_MAC0),
branch_le_zero(R_T0, 28),
nop, /* <--- DELAY SLOT (Index 0) */
/* 5. Store Primitive Data */
/* 1 */ store_word(R_0, R_T7, 0),
/* 2 */ load_ui(R_AT, 0x20FF), /* High: Code 0x20 + Color R:FF */
/* 3 */ or_i(R_AT, R_AT, 0xFFFF), /* Low: Color G:FF, B:FF */
/* 4 */ store_word(R_AT, R_T7, 4),
/* 5 */ enc_gte_sw(C2_SXY0, R_T7, 8),
/* 6 */ enc_gte_sw(C2_SXY1, R_T7, 12),
/* 7 */ enc_gte_sw(C2_SXY2, R_T7, 16),
/* 6. OT Insertion with Bounds Checking */
/* 8 */ nop,
/* 9 */ nop,
/* 10 */ enc_gte_cmd(0x2D), /* AVSZ3 */
/* 11 */ nop, /* Wait for AVSZ3 */
/* 12 */ nop, /* Wait for AVSZ3 */
/* 13 */ gte_mf(R_T1, C2_OTZ), /* T1 = Depth index */
/* Bounds Check: OTZ < 2048 */
/* 14 */ add_ui(R_AT, R_0, 2048), /* <--- FIXED: Use add_ui for small constants! */
/* 15 */ slt_u(R_AT, R_T1, R_AT), /* AT = (OTZ < 2048) ? 1 : 0 */
/* 16 */ branch_equal(R_AT, R_0, 11), /* If AT == 0, skip to end (11 instrs past delay) */
/* 17 */ nop, /* <--- DELAY SLOT (Index 0 for Bounds branch) */
/* 18 (1) */ shift_ll(R_T1, R_T1, 2),
/* 19 (2) */ add_u(R_T1, R_T1, R_T6), /* T1 = &OrderingTable[OTZ] */
/* 20 (3) */ load_word(R_AT, R_T1, 0), /* AT = current head */
/* 21 (4) */ store_word(R_AT, R_T7, 0), /* prim->next = head */
/* Create Tag in AT: Len 4 (0x04) in top 8 bits, T7 in bottom 24 */
/* 22 (5) */ shift_ll(R_AT, R_T7, 8),
/* 23 (6) */ shift_lr(R_AT, R_AT, 8), /* AT = T7 & 0x00FFFFFF */
/* 24 (7) */ load_ui(R_V0, 0x0400), /* V0 = 0x04000000 (Here LUI is correct!) */
/* 25 (8) */ or_u(R_AT, R_AT, R_V0), /* AT = Tag */
/* 26 (9) */ store_word(R_AT, R_T1, 0), /* OrderingTable[OTZ] = Tag */
/* 27 (10) */ add_ui(R_T7, R_T7, 20), /* Advance Prim Cursor (5 words) */
/* 7. Yield */
/* 28 (11) */ add_ui(R_T4, R_T4, 8), /* Advance Face Cursor (4 * S2 = 8 bytes) */
mips_yield
};
/* DIAGNOSTIC 1: Pure tape loop test */
internal Code CodeBlob_(atom_diag_yield) {
mips_yield
};
/* DIAGNOSTIC 2: Pure memory test (No GTE). Draws a fixed cyan triangle. */
internal Code CodeBlob_(atom_diag_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),
/* 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) */
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),
or_u(R_AT, R_AT, R_V0),
store_word(R_AT, R_T1, 0),
add_ui(R_T7, R_T7, 20),
mips_yield
};
/* DIAGNOSTIC 3: Pure GTE test (No Memory Writes) */
internal Code CodeBlob_(atom_diag_gte) {
/* Load 3 indices */
load_half_u(R_T0, R_T4, 0),
load_half_u(R_T1, R_T4, 2),
load_half_u(R_T2, R_T4, 4),
/* Load Vertices into GTE */
shift_ll(R_AT, R_T0, 3), add_u(R_AT, R_AT, R_T5),
load_word(R_V0, R_AT, 0), load_word(R_V1, R_AT, 4),
gte_mt(R_V0, C2_VXY0), gte_mt(R_V1, C2_VZ0),
shift_ll(R_AT, R_T1, 3), add_u(R_AT, R_AT, R_T5),
load_word(R_V0, R_AT, 0), load_word(R_V1, R_AT, 4),
gte_mt(R_V0, C2_VXY1), gte_mt(R_V1, C2_VZ1),
shift_ll(R_AT, R_T2, 3), add_u(R_AT, R_AT, R_T5),
load_word(R_V0, R_AT, 0), load_word(R_V1, R_AT, 4),
gte_mt(R_V0, C2_VXY2), gte_mt(R_V1, C2_VZ2),
/* Run Math */
nop, nop, gte_cmdw_rtpt,
nop, nop, gte_cmdw_nclip,
nop, nop,
/* Advance Face Cursor and Yield */
add_ui(R_T4, R_T4, 8),
mips_yield
};
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