家用機 - Sony Play Station - C/C++ (PsyQ) - Draw Polygon

參考資訊：
https://psx.arthus.net/starting.html
https://github.com/ABelliqueux/nolibgs_hello_worlds#installation

main.c

#include <sys/types.h>
#include <stdio.h>
#include <libgte.h>
#include <libetc.h>
#include <libgpu.h>
 
int main(int argc, char *argv[])
{
    const int w = 320;
    const int h = 240;
    u_long ot = 0;
    DISPENV disp = { 0 };
    DRAWENV draw = { 0 };

    long flag = 0;
    long depth = 0;
    POLY_F4 *poly = 0;
    char buf[32768] = { 0 };
    MATRIX PolyMatrix = { 0 }; 
    SVECTOR RotVector = { 0 };
    SVECTOR VertPos[4] = {
        { -20, -20, 1 },
        { -20,  20, 1 },
        {  20, -20, 1 },
        {  20,  20, 1 }
    };

    ResetGraph(0);
    InitGeom();
    SetGeomOffset(w / 2, h / 2);
 
    SetDefDispEnv(&disp, 0, 0, w, h);
    SetDefDrawEnv(&draw, 0, 0, w, h);
    SetDispMask(1);
    setRGB0(&draw, 0, 0, 0);
    draw.isbg = 1;
 
    PutDispEnv(&disp);
    PutDrawEnv(&draw);
 
    FntLoad(640, 0);
    FntOpen(100, 100, w, h, 0, 255);
 
    while (1) {
        poly = (POLY_F4 *)buf;
        setPolyF4(poly);
        setRGB0(poly, 255, 0, 0);

        RotMatrix(&RotVector, &PolyMatrix);
        SetRotMatrix(&PolyMatrix);
        RotTransPers(&VertPos[0], (long *)&poly->x0, &depth, &flag);
        RotTransPers(&VertPos[1], (long *)&poly->x1, &depth, &flag);
        RotTransPers(&VertPos[2], (long *)&poly->x2, &depth, &flag);
        RotTransPers(&VertPos[3], (long *)&poly->x3, &depth, &flag);
        addPrim(&ot, buf);
 
        FntFlush(-1);
        DrawSync(0);
        VSync(0);
        PutDispEnv(&disp);
        PutDrawEnv(&draw);
        DrawOTag(&ot);
    }
 
    return 0;
}