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nolibgs_hello_worlds/hello_gte_opti/hello_gte_opti.c

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// Hello free cycles !
//
// Ref : /psyq/DOCS/Devrefs/Inlinref.pdf, p.18
// /psyq/psx/sample/scea/GTE
// https://psx-spx.consoledev.net/geometrytransformationenginegte/
// PSX / Z+
// screen /
//coordinate +-----X+
//system / |
// eye | Y+
//
// Credits, thanks : Nicolas Noble, Sickle, Lameguy64 @ psxdev discord : https://discord.com/invite/N2mmwp
// https://discord.com/channels/642647820683444236/663664210525290507/834831466100949002
#include <sys/types.h>
#include <stdio.h>
#include <libetc.h>
#include <libgte.h>
#include <libgpu.h>
// OldWorld PsyQ has a inline_c.h file for inline GTE functions. We have to use the one at https://github.com/grumpycoders/pcsx-redux/blob/07f9b02d1dbb68f57a9f5b9773041813c55a4913/src/mips/psyq/include/inline_n.h
// because the real GTE commands are needed in nugget : https://psx-spx.consoledev.net/geometrytransformationenginegte/#gte-coordinate-calculation-commands
#include <inline_n.h>
// RAM -> CPU and CPU -> GTE macros :
#include "../includes/CPUMAC.H"
#define VMODE 0 // Video Mode : 0 : NTSC, 1: PAL
#define SCREENXRES 320 // Screen width
#define SCREENYRES 240 + (VMODE << 4) // Screen height : If VMODE is 0 = 240, if VMODE is 1 = 256
#define CENTERX ( SCREENXRES >> 1 ) // Center of screen on x
#define CENTERY ( SCREENYRES >> 1 ) // Center of screen on y
#define MARGINX 0 // margins for text display
#define MARGINY 32
#define FONTSIZE 8 * 7 // Text Field Height
#define OTLEN 10 // Ordering Table Length
DISPENV disp[2]; // Double buffered DISPENV and DRAWENV
DRAWENV draw[2];
u_long ot[2][OTLEN]; // double ordering table of length 8 * 32 = 256 bits / 32 bytes
char primbuff[2][32768] = {1}; // double primitive buffer of length 32768 * 8 = 262.144 bits / 32,768 Kbytes
char *nextpri = primbuff[0]; // pointer to the next primitive in primbuff. Initially, points to the first bit of primbuff[0]
short db = 0; // index of which buffer is used, values 0, 1
// DCache setup
#define dc_camdirp ((sshort*) getScratchAddr(0))
#define dc_ip ((uchar*) getScratchAddr(1))
#define dc_opzp ((slong*) getScratchAddr(2))
#define dc_wmatp ((MATRIX*) getScratchAddr(3))
#define dc_cmatp ((MATRIX*) getScratchAddr(9))
#define dc_sxytbl ((DVECTOR*) getScratchAddr(15))
void init(void)
{
ResetGraph(0);
// Initialize and setup the GTE
InitGeom();
//~ SetGeomOffset(CENTERX,CENTERY);
gte_SetGeomOffset(CENTERX,CENTERY);
gte_SetGeomScreen(CENTERX);
// Set display environment
SetDefDispEnv(&disp[0], 0, 0, SCREENXRES, SCREENYRES);
SetDefDispEnv(&disp[1], 0, SCREENYRES, SCREENXRES, SCREENYRES);
// Set draw environment
SetDefDrawEnv(&draw[0], 0, SCREENYRES, SCREENXRES, SCREENYRES);
SetDefDrawEnv(&draw[1], 0, 0, SCREENXRES, SCREENYRES);
if (VMODE){ SetVideoMode(MODE_PAL);}
SetDispMask(1);
// Set background color
setRGB0(&draw[0], 50, 50, 50);
setRGB0(&draw[1], 50, 50, 50);
draw[0].isbg = 1;
draw[1].isbg = 1;
PutDispEnv(&disp[db]);
PutDrawEnv(&draw[db]);
FntLoad(960, 0);
FntOpen(MARGINX, SCREENYRES - MARGINY - FONTSIZE, SCREENXRES - MARGINX * 2, FONTSIZE, 0, 280 );
}
void display(void)
{
// Wait for drawing
DrawSync(0);
// Wait for vsync
VSync(1);
// Flip DISP and DRAW env
PutDispEnv(&disp[db]);
PutDrawEnv(&draw[db]);
DrawOTag(&ot[db][OTLEN - 1]);
// Flip db index
db = !db;
// Get next primitive in buffer
nextpri = primbuff[db];
}
int main(void)
{
long p, flag, OTz;
SVECTOR rotVector = {0};
SVECTOR rotVector4 = {0}; // Initialize rotation vector {x, y, z} - ALWAYS !
VECTOR transVector = {0, 0, CENTERX, 0}; // Initialize translation vector {x, y, z}
SVECTOR vertPos[4] = {
{ 0, -32, 0, 0 }, // Vert 1
{ 32, 0, 0, 0 }, // Vert 2
{ -32, 0, 0, 0 },
{ 0, 32, 0, 0 }
}; // Vert 3
MATRIX workMatrix = {0};
POLY_F3 * poly = {0}; // pointer to a POLY_F4
POLY_F4 * poly4 = {0}; // pointer to a POLY_F4
init();
// Declare registers
register ulong ur0 asm("$16");
register ulong ur1 asm("$17");
register ulong ur2 asm("$18");
register ulong ur3 asm("$19");
register ulong ur4 asm("$20");
register ulong ur5 asm("$21");
while (1)
{
// Set Ordering table
ClearOTagR(ot[db], OTLEN);
// Cast next primitives in buffer as a POLY_F3 and a POLY_F4 (see display() )
poly = (POLY_F3 *)nextpri;
nextpri += sizeof(POLY_F3);
poly4 = (POLY_F4 *)nextpri;
// Set matrices - Move to left of screen
// Draw on the left part of the screen
transVector.vx = -CENTERX/2;
// Increment rotation angle on Y axis
rotVector.vy += 1;
// Find rotation matrix from vector, store in
RotMatrix_gte(&rotVector, &workMatrix);
// Ditto for translation
TransMatrix(&workMatrix, &transVector);
// Set the matrices we just found
gte_SetRotMatrix(&workMatrix);
gte_SetTransMatrix(&workMatrix);
// Draw a Tri and a Quad
// Copy Tri vertices from ram to cpu registers casting as ulong so that ur0 (len 32bits) contains vx and vy (2 * 8bits)
// Hence the use of vx, vz members
cpu_ldr(ur0,(ulong*)&vertPos[0].vx); // Put vx, vy value in ur0
cpu_ldr(ur1,(ulong*)&vertPos[0].vz); // Put vz, pad value in ur1
cpu_ldr(ur2,(ulong*)&vertPos[1].vx);
cpu_ldr(ur3,(ulong*)&vertPos[1].vz);
cpu_ldr(ur4,(ulong*)&vertPos[2].vx);
cpu_ldr(ur5,(ulong*)&vertPos[2].vz);
// Load the gte registers from the cpu registers (gte-cpu move 1 cycle) - mtc2 %0, $0;
cpu_gted0(ur0);
cpu_gted1(ur1);
cpu_gted2(ur2);
cpu_gted3(ur3);
cpu_gted4(ur4);
cpu_gted5(ur5);
// Tri RotTransPers3
// The two last cpu->gte copy will happen during the 2 nops in gte_rtpt()
gte_rtpt();
// Fill the cpu registers with the Quad vertices
cpu_ldr(ur0,(ulong*)&vertPos[0].vx);
cpu_ldr(ur1,(ulong*)&vertPos[0].vz);
cpu_ldr(ur2,(ulong*)&vertPos[1].vx);
cpu_ldr(ur3,(ulong*)&vertPos[1].vz);
cpu_ldr(ur4,(ulong*)&vertPos[2].vx);
cpu_ldr(ur5,(ulong*)&vertPos[2].vz);
// Get nclip value, and win two cycles
gte_nclip();
// Copy Tri 's screen coordinates from gte registers to d-cache.
gte_stsxy3c(&dc_sxytbl[0]);
// Set matrices - Move to right of screen
transVector.vx = CENTERX/2;
// Increment rot on X/Y axis
rotVector4.vy -= 1 ;
rotVector4.vx -= 1 ;
// Set matrices
RotMatrix_gte(&rotVector4, &workMatrix);
TransMatrix(&workMatrix, &transVector);
gte_SetRotMatrix(&workMatrix);
gte_SetTransMatrix(&workMatrix);
// Load the gte registers from the cpu registers (gte-cpu move 1 cycle) - mtc2 %0, $0;
cpu_gted0(ur0);
cpu_gted1(ur1);
cpu_gted2(ur2);
cpu_gted3(ur3);
cpu_gted4(ur4);
cpu_gted5(ur5);
// Quad RotTransPers3
// Getting 2 cycles back thanks to nops
gte_rtpt();
// gte_nclip() has 2 nops, lets use them to load the remaining vertex data from ram->cpu register
cpu_ldr(ur0,(ulong*)&vertPos[3].vx);
cpu_ldr(ur1,(ulong*)&vertPos[3].vz);
// Calculate nclip (outer product)
gte_nclip();
// Copy result to d-cache + 3
gte_stsxy3c(&dc_sxytbl[3]);
// Copy from cpu-gte
cpu_gted0(ur0);
cpu_gted1(ur1);
// Quad last vertex RotTransPers
// These two last cpu->gte load are free :p
gte_rtps();
gte_nclip();
// Copy last vertex value to d-cache
gte_stsxy(&dc_sxytbl[6]);
// Get p, flag, OTz
gte_stdp(&p);
gte_stflg(&flag);
gte_stszotz(&OTz);
// That's 10 cycles we won back ?
// Copy vertices data from d-cache to ram
// Tri
*(unsigned long long*)&poly->x0 = *(unsigned long long*)&dc_sxytbl[0];
*(ulong*)&poly->x2 = *(ulong*)&dc_sxytbl[2];
// Quad
*(unsigned long long*)&poly4->x0 = *(unsigned long long*)&dc_sxytbl[3];
*(unsigned long long*)&poly4->x2 = *(unsigned long long*)&dc_sxytbl[5];
// Initialize polygons
setPolyF3(poly);
setRGB0(poly, 255, 0, 255);
setPolyF4(poly4);
setRGB0(poly4, 0, 255, 255);
// Add to OT
addPrim(ot[db], poly);
addPrim(ot[db], poly4);
// Display text
FntPrint("Hello Free cycles !\n");
FntFlush(-1);
display();
}
return 0;
}
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