vclip-dest: Initial upload

vclip_dest/Makefile

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+EE_BIN= vclip_dest.elf
+EE_OBJS = vclip_dest.o
+EE_LIBS = -lkernel
+EE_CFLAGS = -Werror
+
+all: $(EE_BIN)
+
+clean:
+	rm -f $(EE_OBJS) $(EE_BIN)
+
+run: $(EE_BIN)
+	ps2client execee host:$(EE_BIN)
+
+wsl: $(EE_BIN)
+	$(PCSX2) -elf "$(shell wslpath -w $(shell pwd))/$(EE_BIN)"
+
+emu: $(EE_BIN)
+	$(PCSX2) -elf "$(shell pwd)/$(EE_BIN)"
+
+reset:
+	ps2client reset
+	ps2client netdump
+
+include $(PS2SDK)/samples/Makefile.pref
+include $(PS2SDK)/samples/Makefile.eeglobal

vclip_dest/README.md

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+# VCLIP DEST
+
+## Description
+Tests the dest bit fields of the VU0 macro mode instruction VCLIP
+The manual states that the first 3 are set, unconditionally reading x/y/z of fs
+
+## Expected Results
+It is expected that both clipping functions produce the same clip flag results
+
+```
+vclipw.xyz (Normal)
+CLIP -> - + - + - +
+        z z y y x x
+        0 1 1 0 0 1
+
+vclipw.xy
+CLIP -> - + - + - +
+        z z y y x x
+        0 1 1 0 0 1
+```

vclip_dest/vclip_dest.c

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+#include <kernel.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sio.h>
+
+void dbgmsg(const char *fmt, ...)
+{
+	char buf[256];
+	va_list ap;
+	va_start(ap, fmt);
+	vsnprintf(buf, 256, fmt, ap);
+	vprintf(buf, ap);
+	va_end(ap);
+	sio_puts(buf);
+}
+
+typedef struct
+{
+	float x;
+	float y;
+	float z;
+	float w;
+} VF_REG __aligned(16);
+
+typedef struct
+{
+	u8 xp1 : 1;u8 xn1 : 1;u8 yp1 : 1;u8 yn1 : 1;u8 zp1 : 1;u8 zn1 : 1;
+	u8 xp2 : 1;u8 xn2 : 1;u8 yp2 : 1;u8 yn2 : 1;u8 zp2 : 1;u8 zn2 : 1;
+	u8 xp3 : 1;u8 xn3 : 1;u8 yp3 : 1;u8 yn3 : 1;u8 zp3 : 1;u8 zn3 : 1;
+	u8 xp4 : 1;u8 xn4 : 1;u8 yp4 : 1;u8 yn4 : 1;u8 zp4 : 1;u8 zn4 : 1;
+	u16 _pad : 8;
+} __attribute__((__packed__)) CLIP_REG;
+
+void print_clip(CLIP_REG clip_reg)
+{
+	dbgmsg("CLIP -> - + - + - +\n"
+		   "        z z y y x x\n"
+		   "        %d %d %d %d %d %d\n",
+		   clip_reg.zn1, clip_reg.zp1, clip_reg.yn1, clip_reg.yp1,
+		   clip_reg.xn1, clip_reg.xp1);
+}
+
+int main(void)
+{
+	dbgmsg("VU0 VCLIP DEST BITS TEST\n");
+
+	// Load fs and ft
+	VF_REG fs = {100.0f, -201.0f, 100.00f, 0.0f};
+	VF_REG ft = {200.0f, -200.0f, 0.0f, 50.0f};
+
+	asm volatile(
+		"lqc2 $vf1, %0\n"
+		"vnop\n"
+		"lqc2 $vf2, %1\n"
+		"vnop\n" ::"m"(fs),
+		"m"(ft)
+		:);
+
+	CLIP_REG clip_register_normal;
+	// Try a normal VCLIP instruction
+	asm volatile(
+		"vclipw.xyz $vf1, $vf2\n"
+		"vnop\n"
+		"vnop\n"
+		"vnop\n"
+		"vnop\n"
+		"cfc2 $t0, $18\n"
+		"sw $t0, %0"
+		: "=m"(clip_register_normal)::"$t0");
+
+	dbgmsg("vclipw.xyz (Normal)");
+	print_clip(clip_register_normal);
+
+	// 0x4BC209FF -> vclipw.xyz $vf1, $vf2
+	// 0x4B8209FF -> vclipw.xy $vf1, $vf2
+	// 0x4B0209FF -> vclipw.x $vf1, $vf2
+	CLIP_REG clip_register_modified;
+	asm volatile(
+		".word 0x4B8209FF\n"
+		"vnop\n"
+		"vnop\n"
+		"vnop\n"
+		"vnop\n"
+		"cfc2 $t0, $18\n"
+		"sw $t0, %0"
+		: "=m"(clip_register_modified)::"$t0");
+
+	dbgmsg("vclipw.xy");
+	print_clip(clip_register_modified);
+
+	SleepThread();
+}