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Improve RTPS emulation

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allkern
2023-10-19 11:12:25 -03:00
parent 0f5a17ffae
commit 1b4d507ed5
1 changed files with 15 additions and 8 deletions
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psx/cpu.c
+15 -8
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@@ -1677,6 +1677,7 @@ void psx_cpu_i_rfe(psx_cpu_t* cpu) {
// COP2
#define MIN(a, b) (((a) < (b)) ? (a) : (b))
#define CLAMP(v, a, b) (((v) < (a)) ? (a) : (((v) > (b)) ? (b) : (v)))
void gte_handle_irgb_write(psx_cpu_t* cpu) {
cpu->cop2_dr.ir[1] = ((cpu->cop2_dr.irgb >> 0) & 0x1f) * 0x80;
@@ -1684,6 +1685,14 @@ void gte_handle_irgb_write(psx_cpu_t* cpu) {
cpu->cop2_dr.ir[3] = ((cpu->cop2_dr.irgb >> 10) & 0x1f) * 0x80;
}
void gte_handle_irgb_read(psx_cpu_t* cpu) {
int r = (cpu->cop2_dr.ir[1] / 0x80) & 0x1f;
int g = (cpu->cop2_dr.ir[2] / 0x80) & 0x1f;
int b = (cpu->cop2_dr.ir[3] / 0x80) & 0x1f;
cpu->cop2_dr.irgb = r | (g << 5) | (b << 10);
}
void gte_handle_sxyp_write(psx_cpu_t* cpu) {
cpu->cop2_dr.sxy[0] = cpu->cop2_dr.sxy[1];
cpu->cop2_dr.sxy[1] = cpu->cop2_dr.sxy[2];
@@ -1703,9 +1712,6 @@ void gte_handle_lzcs_write(psx_cpu_t* cpu) {
}
uint32_t gte_read_register(psx_cpu_t* cpu, uint32_t r) {
if (r == 24) {
log_fatal("MAC0 read %08x", cpu->cop2_dr.mac[0]);
}
switch (r) {
case 0 : return cpu->cop2_dr.v[0].xy;
case 1 : return (int32_t)cpu->cop2_dr.v[0].z;
@@ -1735,7 +1741,7 @@ uint32_t gte_read_register(psx_cpu_t* cpu, uint32_t r) {
case 25: return cpu->cop2_dr.mac[1];
case 26: return cpu->cop2_dr.mac[2];
case 27: return cpu->cop2_dr.mac[3];
case 28: return cpu->cop2_dr.irgb;
case 28: gte_handle_irgb_read(cpu); return cpu->cop2_dr.irgb;
case 29: return cpu->cop2_dr.irgb; // IRGB mirror
case 30: return cpu->cop2_dr.lzcs;
case 31: return cpu->cop2_dr.lzcr;
@@ -1919,14 +1925,14 @@ void psx_cpu_i_ctc2(psx_cpu_t* cpu) {
#define R_FLAG cpu->cop2_cr.flag
int32_t gte_clamp_mac0(psx_cpu_t* cpu, int64_t value) {
uint32_t gte_clamp_mac0(psx_cpu_t* cpu, int64_t value) {
if (value < -0x80000000) {
R_FLAG |= 0x8000;
} else if (value > 0x7fffffff) {
R_FLAG |= 0x10000;
}
return value & 0xffffffff;
return value;
}
int32_t gte_clamp_mac(psx_cpu_t* cpu, int i, int64_t value) {
@@ -2227,8 +2233,9 @@ void gte_rtp(psx_cpu_t* cpu, int i, int dq) {
R_SY2 = gte_clamp_sxy(cpu, 2, y);
if (dq) {
R_MAC0 = gte_clamp_mac0(cpu, h_div_sz * I64(R_DQA) + I64(R_DQB));
R_IR0 = gte_clamp_ir0(cpu, R_MAC0 >> 12);
int64_t mac0 = I64(R_DQB) + (h_div_sz * I64(R_DQA));
R_MAC0 = gte_clamp_mac0(cpu, mac0);
R_IR0 = gte_clamp_ir0(cpu, mac0 >> 12);
}
}