215 lines
8.2 KiB
C
215 lines
8.2 KiB
C
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// Hello poly ! Inline / DMPSX version
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//
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// Ref : /psyq/DOCS/Devrefs/Inlinref.pdf, p.18
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// https://psx-spx.consoledev.net/geometrytransformationenginegte/
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// PSX / Z+
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// screen /
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//coordinate +-----X+
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//system / |
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// eye | Y+
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//
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// Credits, thanks : Nicolas Noble, Sickle, Lameguy64 @ psxdev discord : https://discord.com/invite/N2mmwp
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// https://discord.com/channels/642647820683444236/663664210525290507/834831466100949002
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#include <sys/types.h>
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#include <stdio.h>
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#include <libetc.h>
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#include <libgte.h>
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#include <libgpu.h>
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// 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
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// because the real GTE commands are needed in nugget : https://psx-spx.consoledev.net/geometrytransformationenginegte/#gte-coordinate-calculation-commands
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#include <inline_n.h>
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//~ #include <gtemac.h> // gtemac contains macro versions of the libgte functions, worth checking out to see the operations order.
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#define VMODE 0 // Video Mode : 0 : NTSC, 1: PAL
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#define SCREENXRES 320 // Screen width
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#define SCREENYRES 240 + (VMODE << 4) // Screen height : If VMODE is 0 = 240, if VMODE is 1 = 256
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#define CENTERX ( SCREENXRES >> 1 ) // Center of screen on x
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#define CENTERY ( SCREENYRES >> 1 ) // Center of screen on y
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#define MARGINX 0 // margins for text display
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#define MARGINY 32
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#define FONTSIZE 8 * 7 // Text Field Height
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#define OTLEN 10 // Ordering Table Length
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DISPENV disp[2]; // Double buffered DISPENV and DRAWENV
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DRAWENV draw[2];
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u_long ot[2][OTLEN]; // double ordering table of length 8 * 32 = 256 bits / 32 bytes
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char primbuff[2][32768] = {1}; // double primitive buffer of length 32768 * 8 = 262.144 bits / 32,768 Kbytes
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char *nextpri = primbuff[0]; // pointer to the next primitive in primbuff. Initially, points to the first bit of primbuff[0]
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short db = 0; // index of which buffer is used, values 0, 1
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void init(void)
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{
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ResetGraph(0);
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// Initialize and setup the GTE
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InitGeom();
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//~ SetGeomOffset(CENTERX,CENTERY);
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gte_SetGeomOffset(CENTERX,CENTERY);
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gte_SetGeomScreen(CENTERX);
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// Set display environment
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SetDefDispEnv(&disp[0], 0, 0, SCREENXRES, SCREENYRES);
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SetDefDispEnv(&disp[1], 0, SCREENYRES, SCREENXRES, SCREENYRES);
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// Set draw environment
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SetDefDrawEnv(&draw[0], 0, SCREENYRES, SCREENXRES, SCREENYRES);
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SetDefDrawEnv(&draw[1], 0, 0, SCREENXRES, SCREENYRES);
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// If PAL, use 320x256, hence 256 - 240 = 16 / 2 = 8 px vertical offset
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if (VMODE)
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{
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SetVideoMode(MODE_PAL);
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disp[0].screen.y += 8;
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disp[1].screen.y += 8;
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}
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SetDispMask(1);
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// Set background color
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setRGB0(&draw[0], 50, 50, 50);
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setRGB0(&draw[1], 50, 50, 50);
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draw[0].isbg = 1;
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draw[1].isbg = 1;
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PutDispEnv(&disp[db]);
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PutDrawEnv(&draw[db]);
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FntLoad(960, 0);
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FntOpen(MARGINX, SCREENYRES - MARGINY - FONTSIZE, SCREENXRES - MARGINX * 2, FONTSIZE, 0, 280 );
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}
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void display(void)
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{
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// Wait for drawing
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DrawSync(0);
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// Wait for vsync
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VSync(0);
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// Flip DISP and DRAW env
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PutDispEnv(&disp[db]);
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PutDrawEnv(&draw[db]);
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//~ SetDispMask(1);
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DrawOTag(ot[db] + OTLEN - 1);
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// Flip db index
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db = !db;
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// Get next primitive in buffer
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nextpri = primbuff[db];
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}
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int main(void)
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{
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long p, flag, OTz;
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SVECTOR rotVector, rotVector4 = {0}; // Initialize rotation vector {x, y, z}
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VECTOR transVector = {0, 0, CENTERX, 0}; // Initialize translation vector {x, y, z}
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SVECTOR vertPos[4] = {
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{ 0, -32, 0, 0 }, // Vert 1
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{ 32, 0, 0, 0 }, // Vert 2
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{ -32, 0, 0, 0 },
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{ 0, 32, 0, 0 }
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}; // Vert 3
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MATRIX workMatrix = {0};
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POLY_F3 * poly = {0}; // pointer to a POLY_F4
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POLY_F4 * poly4 = {0}; // pointer to a POLY_F4
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init();
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while (1)
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{
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// Set Ordering table
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ClearOTagR(ot[db], OTLEN);
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// Draw on the left part of the screen
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transVector.vx = -CENTERX/2;
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// Increment rotation angle on Y axis
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rotVector.vy += 8;
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rotVector.vx -= 4 ;
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// Find rotation matrix from vector, store in
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RotMatrix_gte(&rotVector, &workMatrix);
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// Ditto for translation
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TransMatrix(&workMatrix, &transVector);
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// Set the matrices we just found
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gte_SetRotMatrix(&workMatrix);
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gte_SetTransMatrix(&workMatrix);
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// Cast next primitive in buffer as a POLY_F4 (see display() )
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poly = (POLY_F3 *)nextpri;
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// Draw a Tri
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// Initialize poly as a POLY_F3
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setPolyF3(poly);
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// Set poly color - Hot pink
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setRGB0(poly, 255, 0, 255);
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// Store vertex positions for current polygon in registers v0,v1,v2
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// Can be replaced by one gte_ldv3 call :
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// gte_ldv3(&vertPos[0], &vertPos[1], &vertPos[2]);
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gte_ldv0(&vertPos[0]);
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gte_ldv1(&vertPos[1]);
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gte_ldv2(&vertPos[2]);
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// RotTransPers3 : Perform coordinate and perspective transformation for three vertices.
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// Use gte_rtps() for one vertex.
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gte_rtpt();
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// Get screen coordinates from cop2 registers XY0,XY1,XY2 and store them in primitive's x0, y0, x1, y1, x2, y2 members.
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// Can be replace with one gte_stsxy3() call :
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// gte_stsxy3(&poly->x0, &poly->x1, &poly->x2);
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// Can also be replaced with a primitive type dependant version :
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// gte_stsxy3_f3(poly);
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gte_stsxy0(&poly->x0);
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gte_stsxy1(&poly->x1);
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gte_stsxy2(&poly->x2);
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// Get depth interpolation coefficient p
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gte_stdp(&p);
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// Get the flag - see libover47.pdf, p.143 for details on ppossible values
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gte_stflg(&flag);
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// Get screen coordinate Z/4
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gte_stszotz(&OTz);
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// GTE macro version - needs 'gtemac.h' to be included - uncomment l.21
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//~ gte_RotTransPers3( &VertPos[0], &VertPos[1], &VertPos[2],
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//~ &poly->x0, &poly->x1, &poly->x2,
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//~ &p, &flag, &OTz );
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// add poly to the Ordering table
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addPrim(ot[db], poly);
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// increment nextpri address with size of a POLY_F3 struct
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nextpri += sizeof(POLY_F3);
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// Draw a Quad
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//
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// The GTE rtpt can only transform 3 vertices at a time, so we have to do all operations as 3 + 1.
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// Move to right of screen
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transVector.vx = CENTERX/2;
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// Increment rot on X/Y axis
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rotVector4.vy -= 8 ;
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rotVector4.vx -= 4 ;
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// Set matrices
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RotMatrix_gte(&rotVector4, &workMatrix);
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TransMatrix(&workMatrix, &transVector);
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gte_SetRotMatrix(&workMatrix);
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gte_SetTransMatrix(&workMatrix);
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// Cast a POLY_F4 at the address we just incremented.
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poly4 = (POLY_F4 *)nextpri;
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// Initialize poly as a POLY_F4
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setPolyF4(poly4);
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// Set Poly color - Blue
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setRGB0(poly4, 0, 255, 255);
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// Transform 3 first vertices
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gte_ldv3(&vertPos[0], &vertPos[1], &vertPos[2]);
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gte_rtpt();
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gte_stsxy3_f4(poly4);
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// Transform remaining vertex
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gte_ldv0(&vertPos[3]);
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gte_rtps();
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// SXY3 is set with gte_stsxy() or gte_stsxy2() ¯\_(ツ)_/¯
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gte_stsxy(&poly4->x3);
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// Get p, flag and OTz
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gte_stdp(&p);
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gte_stflg(&flag);
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gte_stszotz(&OTz);
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addPrim(ot[db], poly4); // add poly to the Ordering table
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nextpri += sizeof(POLY_F4); // increment nextpri address with size of a POLY_F3 struct
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// Display text
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FntPrint("Hello Inline GTE !\n");
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FntFlush(-1);
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display();
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}
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return 0;
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}
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