mirror of
https://github.com/RetroPortingToolKit/psxrecomp
synced 2026-10-26 10:19:47 -04:00
Pegasus
179 lines
7.4 KiB
C++
179 lines
7.4 KiB
C++
#pragma once
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#include <cstdint>
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#include <cstring>
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namespace PSXRecomp {
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namespace GTE {
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// PSX GTE FLAG register bit definitions
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// Bit 31: Error summary (set if any of bits 30-23 or 18-13 are set)
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// Bits 30-25: MAC1/2/3 positive/negative overflow (>43 bits)
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// Bits 24-22: IR1/2/3 saturated
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// Bits 21-19: Color R/G/B saturated
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// Bit 18: SZ3/OTZ saturated
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// Bit 17: Divide overflow
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// Bit 16: MAC0 positive overflow
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// Bit 15: MAC0 negative overflow
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// Bits 14-13: SX2/SY2 saturated
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// Bit 12: IR0 saturated
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enum GTEFlags : uint32_t {
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FLAG_MAC1_POS = 1u << 30, FLAG_MAC2_POS = 1u << 29, FLAG_MAC3_POS = 1u << 28,
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FLAG_MAC1_NEG = 1u << 27, FLAG_MAC2_NEG = 1u << 26, FLAG_MAC3_NEG = 1u << 25,
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FLAG_IR1_SAT = 1u << 24, FLAG_IR2_SAT = 1u << 23, FLAG_IR3_SAT = 1u << 22,
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FLAG_COLOR_R = 1u << 21, FLAG_COLOR_G = 1u << 20, FLAG_COLOR_B = 1u << 19,
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FLAG_SZ3_OTZ = 1u << 18, FLAG_DIV_OVF = 1u << 17,
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FLAG_MAC0_POS = 1u << 16, FLAG_MAC0_NEG = 1u << 15,
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FLAG_SX2_SAT = 1u << 14, FLAG_SY2_SAT = 1u << 13,
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FLAG_IR0_SAT = 1u << 12,
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FLAG_ERROR_MASK = 0x7F87E000u,
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FLAG_ERROR_BIT = 0x80000000u,
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};
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struct GTEState {
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// === Data Registers ===
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int16_t V0[3], V1[3], V2[3]; // Vertex vectors (s3.12)
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int32_t SXY[4]; // Screen XY FIFO (packed: X low16, Y high16)
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uint16_t SZ[4]; // Screen Z FIFO (unsigned 16-bit)
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uint32_t RGBC; // Current input color/code register
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uint32_t RGB[3]; // RGB color FIFO (RGB0..RGB2)
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uint32_t RES1; // Undocumented read/write data register 23
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// === Control Registers (matrices, vectors, config) ===
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int16_t RT[3][3]; // Rotation matrix (s3.12)
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int32_t TR[3]; // Translation vector (32-bit)
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int16_t L[3][3]; // Light source direction matrix (s3.12)
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int32_t BK[3]; // Background color (32-bit)
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int16_t LC[3][3]; // Light color matrix (s3.12) — replaces LR/LG/LB
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int32_t FC[3]; // Far color (32-bit)
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int32_t OFX, OFY; // Screen offset (s15.16)
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uint16_t H; // Projection plane distance (unsigned 16-bit)
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int16_t DQA; // Depth queing coefficient A (signed 16-bit)
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int32_t DQB; // Depth queing coefficient B (signed 32-bit!)
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int16_t ZSF3, ZSF4; // Z-scale factors (signed 16-bit)
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// === Intermediate/Result Registers ===
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int16_t IR0, IR1, IR2, IR3; // Intermediate results (signed 16-bit)
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int32_t MAC0, MAC1, MAC2, MAC3; // Multiply-accumulate results (32-bit)
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uint16_t OTZ; // Ordering table Z (unsigned 16-bit)
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int32_t LZCS; // Leading zero count source (32-bit)
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int32_t LZCR; // Leading zero count result (32-bit)
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// === Flag Register ===
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uint32_t FLAG;
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GTEState() { std::memset(this, 0, sizeof(GTEState)); }
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// --- Saturation helpers ---
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int16_t saturate_ir(int32_t value, int ir_num, bool lm = false) {
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int32_t min_val = lm ? 0 : -0x8000;
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if (value < min_val) {
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FLAG |= (1u << (25 - ir_num)); // IR1=24, IR2=23, IR3=22
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return static_cast<int16_t>(min_val);
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}
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if (value > 0x7FFF) {
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FLAG |= (1u << (25 - ir_num));
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return 0x7FFF;
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}
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return static_cast<int16_t>(value);
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}
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int16_t saturate_ir0(int32_t value) {
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if (value < 0) { FLAG |= FLAG_IR0_SAT; return 0; }
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if (value > 0x1000) { FLAG |= FLAG_IR0_SAT; return 0x1000; }
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return static_cast<int16_t>(value);
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}
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uint8_t saturate_color(int32_t value, int component) {
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if (value < 0) { FLAG |= (1u << (21 - component)); return 0; }
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if (value > 255) { FLAG |= (1u << (21 - component)); return 255; }
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return static_cast<uint8_t>(value);
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}
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uint16_t saturate_sz(int32_t value) {
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if (value < 0) { FLAG |= FLAG_SZ3_OTZ; return 0; }
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if (value > 0xFFFF) { FLAG |= FLAG_SZ3_OTZ; return 0xFFFF; }
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return static_cast<uint16_t>(value);
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}
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void check_mac_overflow(int64_t value, int mac_num) {
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// mac_num: 1,2,3
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if (value > 0x7FFFFFFFFFFLL) FLAG |= (1u << (31 - mac_num)); // MAC1=30, MAC2=29, MAC3=28
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if (value < -0x80000000000LL) FLAG |= (1u << (28 - mac_num)); // MAC1=27, MAC2=26, MAC3=25
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}
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void check_mac0_overflow(int64_t value) {
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if (value > 0x7FFFFFFFLL) FLAG |= FLAG_MAC0_POS;
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if (value < -0x80000000LL) FLAG |= FLAG_MAC0_NEG;
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}
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void push_sxy(int64_t sx, int64_t sy) {
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// Saturate to screen coordinates and set flags
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int16_t sx_sat, sy_sat;
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if (sx < -0x400) { sx_sat = -0x400; FLAG |= FLAG_SX2_SAT; }
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else if (sx > 0x3FF) { sx_sat = 0x3FF; FLAG |= FLAG_SX2_SAT; }
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else { sx_sat = static_cast<int16_t>(sx); }
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if (sy < -0x400) { sy_sat = -0x400; FLAG |= FLAG_SY2_SAT; }
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else if (sy > 0x3FF) { sy_sat = 0x3FF; FLAG |= FLAG_SY2_SAT; }
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else { sy_sat = static_cast<int16_t>(sy); }
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// Push FIFO
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SXY[0] = SXY[1]; SXY[1] = SXY[2];
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SXY[2] = (static_cast<uint32_t>(sy_sat & 0xFFFF) << 16) |
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(static_cast<uint32_t>(sx_sat & 0xFFFF));
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SXY[3] = SXY[2];
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}
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void push_sz(int32_t value) {
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SZ[0] = SZ[1]; SZ[1] = SZ[2]; SZ[2] = SZ[3];
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SZ[3] = saturate_sz(value);
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}
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void push_rgb(uint8_t r, uint8_t g, uint8_t b) {
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uint8_t cd = (RGBC >> 24) & 0xFF; // Code byte from RGBC
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RGB[0] = RGB[1]; RGB[1] = RGB[2];
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RGB[2] = (cd << 24) | (b << 16) | (g << 8) | r;
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}
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void set_error_flag() {
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if (FLAG & FLAG_ERROR_MASK) FLAG |= FLAG_ERROR_BIT;
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}
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};
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// === GTE Operations ===
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void gte_rtps_internal(GTEState* gte, int16_t* V, bool setMac0, uint32_t instr = 0x0180001u);
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void gte_rtps(GTEState* gte, uint32_t instr);
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void gte_rtpt(GTEState* gte, uint32_t instr);
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void gte_nclip(GTEState* gte, uint32_t instr);
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void gte_avsz3(GTEState* gte, uint32_t instr);
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void gte_avsz4(GTEState* gte, uint32_t instr);
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void gte_nccs_internal(GTEState* gte, int16_t* V);
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void gte_nccs(GTEState* gte, uint32_t instr);
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void gte_ncct(GTEState* gte, uint32_t instr);
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void gte_ncds_internal(GTEState* gte, int16_t* V);
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void gte_ncds(GTEState* gte, uint32_t instr);
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void gte_ncdt(GTEState* gte, uint32_t instr);
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void gte_ncs_internal(GTEState* gte, int16_t* V);
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void gte_ncs(GTEState* gte, uint32_t instr);
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void gte_nct(GTEState* gte, uint32_t instr);
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void gte_dpcs(GTEState* gte, uint32_t instr);
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void gte_dpct(GTEState* gte, uint32_t instr);
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void gte_dpcl(GTEState* gte, uint32_t instr);
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void gte_intpl(GTEState* gte, uint32_t instr);
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void gte_cdp(GTEState* gte, uint32_t instr);
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void gte_cc(GTEState* gte, uint32_t instr);
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void gte_mvmva(GTEState* gte, uint32_t instr);
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void gte_op(GTEState* gte, uint32_t instr);
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void gte_sqr(GTEState* gte, uint32_t instr);
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void gte_gpf(GTEState* gte, uint32_t instr);
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void gte_gpl(GTEState* gte, uint32_t instr);
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// Register transfer
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void gte_mtc2(GTEState* gte, uint8_t reg, uint32_t value);
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uint32_t gte_mfc2(GTEState* gte, uint8_t reg);
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void gte_ctc2(GTEState* gte, uint8_t reg, uint32_t value);
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uint32_t gte_cfc2(GTEState* gte, uint8_t reg);
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} // namespace GTE
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} // namespace PSXRecomp
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