2025-11-29 16:27:31 -08:00
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// Global scalar regs:
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vGeomMid equ $5 // Middle two bytes of geometry mode in lower 16 bits
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perfCounterD equ $12 // Performance counter D (functions depend on config)
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altBaseReg equ $13 // Alternate base address register for vector loads
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rdpCmdBufEndP1 equ $22 // Pointer to one command word past "end" (middle) of RDP command buf
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rdpCmdBufPtr equ $23 // RDP command buffer current DMEM pointer
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taskDataPtr equ $26 // Task data (display list) DRAM pointer
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inputBufferPos equ $27 // DMEM position within display list input buffer, relative to end
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perfCounterA equ $28 // Performance counter A (functions depend on config)
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perfCounterB equ $29 // Performance counter B (functions depend on config)
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perfCounterC equ $30 // Performance counter C (functions depend on config)
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// Misc:
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nextRA equ $10 // Address to return to after overlay load
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dmaLen equ $19 // DMA length in bytes minus 1
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dmemAddr equ $20 // DMA address in DMEM or IMEM. Also = rdpCmdBufPtr - rdpCmdBufEndP1 for flush_rdp_buffer
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ovlInitClock equ $21 // Temp for profiling. Share register with values not kept across ovl load.
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cmd_w1_dram equ $24 // DL command word 1, which is also DMA DRAM addr
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cmd_w0 equ $25 // DL command word 0, also holds next tris info
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2025-11-29 18:13:11 -08:00
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// Tri write scalar regs:
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origV1Addr equ $4 // Original / current vertex 1 address
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flatV1Offset equ $16 // Offset +'d to vtx 1 addr for flat shading. 0 except in clipping.
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2025-11-29 16:27:31 -08:00
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// Global vector regs:
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// TODO can maybe get rid of vZero
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vZero equ $v0 // All elements = 0; NOT global, only in tri write and clip. Mtx in vtx.
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vTRC equ $v1 // Triangle Constants; NOT global, only in tri write and clip. Mtx in vtx.
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vOne equ $v28 // All elements = 1; global
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// $v29: permanent temp register, also write results here to discard
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// $v30: vtx / lt = sSTO + persp norm + more lighting params; tri write = snake saved index
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// $v31: Global constant vector register
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