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Snake working

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Sauraen
2025-09-28 17:20:07 -07:00
parent 3ebe64d532
commit dfbba19f9f
1 changed files with 35 additions and 30 deletions
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f3dex3.s
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@@ -655,6 +655,9 @@ vertexBuffer:
// Space for temporary verts for clipping code, and reused for other things
clipTempVerts:
yieldOrigV1Addr:
.skip 2 // Needs to be saved over yield
// Round up to 0x8
.org ((clipTempVerts + 0x7) & 0xFF8)
@@ -1043,6 +1046,7 @@ start: // This is at IMEM 0x1080, not the start of IMEM
lw perfCounterC, yieldDataFooter + YDF_OFFSET_PERFCOUNTERC
lw perfCounterD, yieldDataFooter + YDF_OFFSET_PERFCOUNTERD
lw taskDataPtr, yieldDataFooter + YDF_OFFSET_TASKDATAPTR
lh origV1Addr, yieldOrigV1Addr
j finish_setup
li nextRA, displaylist_dma_from_yield
@@ -1163,6 +1167,18 @@ load_overlays_0_1:
j load_overlay_inner
li dmemAddr, 0x1000
G_GEOMETRYMODE_handler: // 6
lw $11, geometryModeLabel // load the geometry mode value
and $11, $11, cmd_w0 // clears the flags in cmd_w0 (set in g*SPClearGeometryMode)
or cmd_w1_dram, cmd_w1_dram, $11 // sets the flags in cmd_w1_dram (set in g*SPSetGeometryMode)
srl vGeomMid, cmd_w1_dram, 8 // Middle 2 bytes of geom mode to lower 16 bits. Ordered this way to avoid stalls.
G_RDPHALF_1_handler: // $ra = ., 0x10 ahead of geometry mode
.if (G_RDPHALF_1_handler - G_GEOMETRYMODE_handler) != (rdpHalf1Val - geometryModeLabel)
.error "G_RDPHALF_1 optimization broken"
.endif
j run_next_DL_command
sw cmd_w1_dram, (geometryModeLabel - G_GEOMETRYMODE_handler)($ra)
G_RDPHALF_2_handler: // 8; should be after the handlers with alignment needs
li $11, texrectState
ldv $v29[0], (0)($11)
@@ -1289,7 +1305,7 @@ G_LIGHTTORDP_handler: // 9
align_with_warning 8, "One instruction of padding before tri snake"
.macro snake_c_to_v30
lpv $v30[0], (inputBufferEndSgn)(inputBufferPos) // c to elem 1
lpv $v30[1], (inputBufferEndSgn)(inputBufferPos) // c (pos+1) to elem 2
.endmacro
// Index = bits 1-6; direction flag = bit 0; end flag = bit 7
@@ -1297,25 +1313,25 @@ align_with_warning 8, "One instruction of padding before tri snake"
// [bb cc] Indices b and c
// |
// inputBufferPos + inputBufferEnd
// TODO need to save origV1Addr across yield
tri_snake_ret_from_input_buffer:
snake_c_to_v30
lpv $v30[2], (inputBufferEndSgn)(inputBufferPos) // c (pos+0) to elem 2
lbu $3, (inputBufferEnd)(inputBufferPos) // Load c; clear real index b sign bit -> don't exit
vand $v6, $v30, vTRC_7E00 // Mask out dir flag and end flag
j tri_snake_loop_from_input_buffer // inputBufferPos pointing to first byte loaded
G_TRISNAKE_handler:
li $ra, tri_snake_loop // For both init and above (clobbered by DMA).
lpv $v30[6], (inputBufferEndSgn - 0x10)(inputBufferPos) // 03 to elem 1; becomes new origV1Addr
lpv $v30[7], (inputBufferEndSgn - 0x10)(inputBufferPos) // 03 to elem 2; becomes new origV1Addr
slv $v7[4], (rdpHalf1Val - altBase)(altBaseReg) // Store past addrs b, c (01 03)
addi inputBufferPos, inputBufferPos, -6 // Point to byte 2: looks at done flag from 01 and dir flag from 03
mfc2 origV1Addr, $v7[2] // 02; will get stored below as c
tri_snake_loop:
// $v30 elem 1 has new index c, which will become new origV1Addr.
// $v30 elem 2 has new index c, which will become new origV1Addr.
// origV1Addr has last one, which gets stored to the V2 or V3 spot.
lh $3, (inputBufferEnd)(inputBufferPos) // Load indices b and c
tri_snake_loop_from_input_buffer:
vand $v6, $v30, vTRC_7E00 // Mask out dir flag and end flag
vmudn $v29, vOne, vTRC_VB // Address of vertex buffer
addi inputBufferPos, inputBufferPos, 1 // Increment indices being read
tri_snake_loop_from_input_buffer:
vmudn $v29, vOne, vTRC_VB // Address of vertex buffer
beqz inputBufferPos, tri_snake_over_input_buffer // == 0 at end of input buffer
andi $11, $3, 1 // Get direction flag from index c
vmadl $v6, $v6, vTRC_VS // Plus vtx indices times length
@@ -1323,7 +1339,7 @@ tri_snake_loop_from_input_buffer:
sll $11, $11, 1 // Halfword address
sh origV1Addr, (rdpHalf1Val)($11) // Store old v1 as 2 if dir clear or 3 if set
llv $v7[4], (rdpHalf1Val - altBase)(altBaseReg) // Load addresses 2, 3 to elem 2, 3
mfc2 origV1Addr, $v6[2]
mfc2 origV1Addr, $v6[4] // In elem 2 (not elem 1 like 1tri)
lh $2, (rdpHalf1Val + 0)($zero)
j tri_from_snake // Repeat next instr so we can skip lbu origV1Addr
snake_c_to_v30
@@ -2635,17 +2651,6 @@ tris_end:
lqv vTRC, (vTRCValue)($zero) // Restore value overwritten by matrix
.endif
// Converts the segmented address in cmd_w1_dram to the corresponding physical address
segmented_to_physical: // 8
srl $11, cmd_w1_dram, 22 // Copy (segment index << 2) into $11
andi $11, $11, 0x3C // Clear the bottom 2 bits that remained during the shift
vadd $v8, $v8, $v9[1] // elem 2 = vertex count * size
lw $11, (segmentTable)($11) // Get the current address of the segment
sll cmd_w1_dram, cmd_w1_dram, 8 // Shift the address to the left so that the top 8 bits are shifted out
srl cmd_w1_dram, cmd_w1_dram, 8 // Shift the address back to the right, resulting in the original with the top 8 bits cleared
jr $ra
add cmd_w1_dram, cmd_w1_dram, $11 // Add the segment's address to the masked input address, resulting in the virtual address
tri_snake_over_input_buffer:
bgez $3, displaylist_dma_goto_next_ra // If $3 < 0, last tri flag set, proceed to end
li nextRA, tri_snake_ret_from_input_buffer // inputBufferPos is now 0; load whole buffer
@@ -2823,6 +2828,7 @@ task_done_or_yield:
beqz $7, task_done // see above
sw perfCounterD, yieldDataFooter + YDF_OFFSET_PERFCOUNTERD
task_yield: // Otherwise CPU requested yield
sh origV1Addr, yieldOrigV1Addr
lw $11, OSTask + OSTask_ucode // Save pointer to current ucode
lw cmd_w1_dram, OSTask + OSTask_yield_data_ptr
li dmemAddr, -0x8000 // 0, but negative = write
@@ -3019,17 +3025,16 @@ displaylist_dma_from_yield: // 2
j displaylist_dma_goto_next_ra
lh nextRA, tempTriRA
G_GEOMETRYMODE_handler: // 6
lw $11, geometryModeLabel // load the geometry mode value
and $11, $11, cmd_w0 // clears the flags in cmd_w0 (set in g*SPClearGeometryMode)
or cmd_w1_dram, cmd_w1_dram, $11 // sets the flags in cmd_w1_dram (set in g*SPSetGeometryMode)
srl vGeomMid, cmd_w1_dram, 8 // Middle 2 bytes of geom mode to lower 16 bits. Ordered this way to avoid stalls.
G_RDPHALF_1_handler: // $ra = ., 0x10 ahead of geometry mode
.if (G_RDPHALF_1_handler - G_GEOMETRYMODE_handler) != (rdpHalf1Val - geometryModeLabel)
.error "G_RDPHALF_1 optimization broken"
.endif
j run_next_DL_command
sw cmd_w1_dram, (geometryModeLabel - G_GEOMETRYMODE_handler)($ra)
// Converts the segmented address in cmd_w1_dram to the corresponding physical address
segmented_to_physical: // 8
srl $11, cmd_w1_dram, 22 // Copy (segment index << 2) into $11
andi $11, $11, 0x3C // Clear the bottom 2 bits that remained during the shift
vadd $v8, $v8, $v9[1] // elem 2 = vertex count * size
lw $11, (segmentTable)($11) // Get the current address of the segment
sll cmd_w1_dram, cmd_w1_dram, 8 // Shift the address to the left so that the top 8 bits are shifted out
srl cmd_w1_dram, cmd_w1_dram, 8 // Shift the address back to the right, resulting in the original with the top 8 bits cleared
jr $ra
add cmd_w1_dram, cmd_w1_dram, $11 // Add the segment's address to the masked input address, resulting in the virtual address
ovl1_end:
align_with_warning 8, "One instruction of padding at end of ovl1"