nolibgs_hello_worlds/hello_poly/hello_poly.c

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// With help from Nicolas Noble, Jaby smoll Seamonstah
// Based on Lameguy64's tutorial series : http://lameguy64.net/svn/pstutorials/chapter1/2-graphics.html
//
// From ../psyq/addons/graphics/MESH/RMESH/TUTO0.C :
//
/* PSX screen coordinate system
*
* Z+
* /
* /
* +------X+
* /|
* / |
* / Y+
* eye */
#include <sys/types.h>
#include <stdio.h>
#include <libgte.h>
#include <libetc.h>
#include <libgpu.h>
#include <libapi.h>
#define VMODE 0 // Video Mode : 0 : NTSC, 1: PAL
#define SCREENXRES 320 // Screen width
#define SCREENYRES 240 // Screen height
#define CENTERX SCREENXRES/2 // Center of screen on x
#define CENTERY SCREENYRES/2 // Center of screen on y
#define MARGINX 0 // margins for text display
#define MARGINY 32
#define FONTSIZE 8 * 7 // Text Field Height
#define OTLEN 8 // 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
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char primbuff[2][32768]; // 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
MATRIX identity(int num) // generate num x num matrix
{
int row, col;
MATRIX matrix;
for (row = 0; row < num; row++)
{
for (col = 0; col < num; col++)
{
if (row == col)
matrix.m[row][col] = 4096;
else
matrix.m[row][col] = 0;
}
}
return matrix;
}
void init(void)
{
ResetGraph(0);
// Initialize and setup the GTE
InitGeom();
SetGeomOffset(CENTERX,CENTERY);
SetGeomScreen(CENTERX);
SetDefDispEnv(&disp[0], 0, 0, SCREENXRES, SCREENYRES);
SetDefDispEnv(&disp[1], 0, SCREENYRES, SCREENXRES, SCREENYRES);
SetDefDrawEnv(&draw[0], 0, SCREENYRES, SCREENXRES, SCREENYRES);
SetDefDrawEnv(&draw[1], 0, 0, SCREENXRES, SCREENYRES);
if (VMODE)
{
SetVideoMode(MODE_PAL);
disp[0].screen.y += 8;
disp[1].screen.y += 8;
}
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SetDispMask(1); // Display on screen
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)
{
DrawSync(0);
VSync(0);
PutDispEnv(&disp[db]);
PutDrawEnv(&draw[db]);
DrawOTag(&ot[db][OTLEN - 1]);
db = !db;
nextpri = primbuff[db];
}
int main(void)
{
MATRIX IDMATRIX = identity(3); // Generate 3x3 identity matrix
POLY_F4 *poly = {0}; // pointer to a POLY_F4
SVECTOR RotVector = {0, 0, 0}; // Initialize rotation vector {x, y, z}
VECTOR MovVector = {0, 0, CENTERX, 0}; // Initialize translation vector {x, y, z}
VECTOR ScaleVector ={ONE, ONE, ONE}; // ONE is define as 4096 in libgte.h
SVECTOR VertPos[4] = { // Set initial vertices position relative to 0,0 - see here : https://psx.arthus.net/docs/poly_f4.jpg
{-32, -32, 1 }, // Vert 1
{-32, 32, 1 }, // Vert 2
{ 32, -32, 1 }, // Vert 3
{ 32, 32, 1 } // Vert 4
};
MATRIX PolyMatrix = IDMATRIX;
long polydepth;
long polyflag;
long OTz;
init();
while (1)
{
ClearOTagR(ot[db], OTLEN);
poly = (POLY_F4 *)nextpri; // Set poly to point to the address of the next primitiv in the buffer
// Set transform matrices for this polygon
RotMatrix(&RotVector, &PolyMatrix); // Apply rotation matrix
TransMatrix(&PolyMatrix, &MovVector);
ScaleMatrix(&PolyMatrix, &ScaleVector); // Apply translation matrix
SetRotMatrix(&PolyMatrix); // Set default rotation matrix
SetTransMatrix(&PolyMatrix); // Set default transformation matrix
setPolyF4(poly); // Initialize poly as a POLY_F4
setRGB0(poly, 255, 0, 255); // Set poly color
// RotTransPers
//~ OTz = RotTransPers(&VertPos[0], (long*)&poly->x0, &polydepth, &polyflag);
//~ RotTransPers(&VertPos[1], (long*)&poly->x1, &polydepth, &polyflag);
//~ RotTransPers(&VertPos[2], (long*)&poly->x2, &polydepth, &polyflag);
//~ RotTransPers(&VertPos[3], (long*)&poly->x3, &polydepth, &polyflag);
// RotTransPers4 equivalent
OTz = RotTransPers4(
&VertPos[0], &VertPos[1], &VertPos[2], &VertPos[3],
(long*)&poly->x0, (long*)&poly->x1, (long*)&poly->x2, (long*)&poly->x3,
&polydepth,
&polyflag
); // Perform coordinate and perspective transformation for 4 vertices
RotVector.vy += 4;
RotVector.vz += 4; // Apply rotation on Z-axis. On PSX, the Z-axis is pointing away from the screen.
addPrim(ot[db], poly); // add poly to the Ordering table
nextpri += sizeof(POLY_F4); // increment nextpri address with size of a POLY_F4 struct
FntPrint("Hello Poly !");
FntFlush(-1);
display();
}
return 0;
}