ABelliqueux/nolibgs_hello_worlds
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nolibgs_hello_worlds/hello_poly_subdiv/hello_poly_subdiv.c

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// Hello poly ! Inline / DMPSX version
//
// Ref : /psyq/DOCS/Devrefs/Inlinref.pdf, p.18
// 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>
//~ #include <gtemac.h> // gtemac contains macro versions of the libgte functions, worth checking out to see the operations order.
#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
short subdiv = 1;
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 PAL, use 320x256, hence 256 - 240 = 16 / 2 = 8 px vertical offset
if (VMODE)
{
SetVideoMode(MODE_PAL);
disp[0].screen.y += 8;
disp[1].screen.y += 8;
}
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(0);
// 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}
VECTOR transVector = {0, 0, CENTERX, 0}; // Initialize translation vector {x, y, z}
SVECTOR vertPos[4] = { // 0 ______ 1
{ -64, -32, 0, 0 }, // Vert 1 | |
{ 32, -32, 0, 0 }, // Vert 2 | _______|
{ -32, 48, 0, 0 }, // 2 3
{ 22, 50, 0, 0 }
}; // Vert 3
MATRIX workMatrix = {0};
POLY_F4 * poly = {0}; // pointer to a POLY_F4
POLY_F4 * poly4 = {0}; // pointer to a POLY_F4
POLY_F4 * polySub[4] = {0}; // pointer to a POLY_F4
init();
while (1)
{
// Set Ordering table
ClearOTagR(ot[db], OTLEN);
rotVector.vz += 4;
// 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);
poly4 = (POLY_F4 *)nextpri;
nextpri += sizeof(POLY_F4); // increment nextpri address with size of a POLY_F3 struct
polySub[0] = (POLY_F4 *)nextpri;
nextpri += sizeof(POLY_F4);
polySub[1] = (POLY_F4 *)nextpri;
nextpri += sizeof(POLY_F4);
polySub[2] = (POLY_F4 *)nextpri;
nextpri += sizeof(POLY_F4);
polySub[3] = (POLY_F4 *)nextpri;
polySub[0]->x0 = poly4->x0;
polySub[0]->y0 = poly4->y0;
polySub[0]->x1 = (poly4->x0 + poly4->x1) >> 1;
polySub[0]->y1 = (poly4->y0 + poly4->y1) >> 1;
polySub[0]->x2 = (poly4->x0 + poly4->x2) >> 1;
polySub[0]->y2 = (poly4->y0 + poly4->y2) >> 1;
polySub[0]->x3 = (poly4->x0 + poly4->x3) >> 1;
polySub[0]->y3 = (poly4->y0 + poly4->y3) >> 1;
polySub[1]->x0 = polySub[0]->x1;
polySub[1]->y0 = polySub[0]->y1;
polySub[1]->x1 = poly4->x1;
polySub[1]->y1 = poly4->y1;
polySub[1]->x2 = polySub[0]->x3;
polySub[1]->y2 = polySub[0]->y3;
polySub[1]->x3 = (poly4->x1 + poly4->x3) >> 1;
polySub[1]->y3 = (poly4->y1 + poly4->y3) >> 1;
polySub[2]->x0 = polySub[0]->x2;
polySub[2]->y0 = polySub[0]->y2;
polySub[2]->x1 = polySub[0]->x3;
polySub[2]->y1 = polySub[0]->y3;
polySub[2]->x2 = poly4->x2;
polySub[2]->y2 = poly4->y2;
polySub[2]->x3 = (poly4->x2 + poly4->x3) >> 1;
polySub[2]->y3 = (poly4->y2 + poly4->y3) >> 1;
polySub[3]->x0 = polySub[0]->x3;
polySub[3]->y0 = polySub[0]->y3;
polySub[3]->x1 = polySub[1]->x3;
polySub[3]->y1 = polySub[1]->y3;
polySub[3]->x2 = polySub[2]->x3;
polySub[3]->y2 = polySub[2]->y3;
polySub[3]->x3 = poly4->x3;
polySub[3]->y3 = poly4->y3;
// Draw a Quad
// Transform 3 first vertices
gte_ldv3(&vertPos[0], &vertPos[1], &vertPos[2]);
gte_rtpt();
gte_stsxy3_f4(poly4);
// Transform remaining vertex
gte_ldv0(&vertPos[3]);
gte_rtps();
// SXY3 is set with gte_stsxy() or gte_stsxy2() ¯\_(ツ)_/¯
gte_stsxy(&poly4->x3);
// Get p, flag and OTz
gte_stdp(&p);
gte_stflg(&flag);
gte_stszotz(&OTz);
if ( subdiv == 0){
setPolyF4(poly4);
setRGB0(poly4, 0, 255, 255);
addPrim(ot[db], poly4);
} else {
setPolyF4(polySub[0]);
setRGB0(polySub[0], 255, 0, 255);
addPrim(ot[db], polySub[0]);
setPolyF4(polySub[1]);
setRGB0(polySub[1], 128, 0, 255);
addPrim(ot[db], polySub[1]);
setPolyF4(polySub[2]);
setRGB0(polySub[2], 0, 128, 255);
addPrim(ot[db], polySub[2]);
setPolyF4(polySub[3]);
setRGB0(polySub[3], 100, 255, 0);
addPrim(ot[db], polySub[3]);
}
// Display text
FntPrint("Hello poly subdiv !\n");
FntFlush(-1);
display();
}
return 0;
}
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