378 lines
16 KiB
C
378 lines
16 KiB
C
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// Controls :
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// SELECT : Switch semi-transparency on/off on primitives
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// START : Cycle semi-transparency rates on/off on primitives
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// LEFT/RIGHT: Move forward cube
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// X : Reset Cube position
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// Schnappy 11-2021
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#include <sys/types.h>
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#include <libgte.h>
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#include <libgpu.h>
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#include <libetc.h>
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#include <libapi.h>
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#include <inline_n.h>
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#include <gtemac.h>
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// Sample vector model
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#include "cubetex.c"
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#define VMODE 0
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// Number of primitives to draw
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#define NUM_PRIM 2
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// Number of textures to load
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#define NUM_TEX 3
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#define SCREENXRES 320
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#define SCREENYRES 240
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#define CENTERX SCREENXRES/2
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#define CENTERY SCREENYRES/2
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#define MARGINX 16 // margins for text display
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#define MARGINY 16
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#define OTLEN 2048 // Maximum number of OT entries
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#define PRIMBUFFLEN 32768 // Maximum number of POLY_GT3 primitives
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// Display and draw environments, double buffered
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DISPENV disp[2];
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DRAWENV draw[2];
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u_long ot[2][OTLEN]; // Ordering table (contains addresses to primitives)
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char primbuff[2][PRIMBUFFLEN]; // Primitive list // That's our prim buffer
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char * nextpri = primbuff[0]; // Primitive counter
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short db = 0; // Current buffer counter
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// Store TIM files in an array so we can iterate over them - see 'cubetex.c' for TIM_FILE struct and declaration
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TIM_FILE * timFiles[3];
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TIM_IMAGE timImages[3];
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// Get included tim files address
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extern TIM_FILE _binary_TIM_cube_tim_start;
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extern TIM_FILE _binary_TIM_sky_tim_start;
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extern TIM_FILE _binary_TIM_bg_tim_start;
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// Light
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CVECTOR BGc = {130, 200, 255, 0};
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// Back color
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VECTOR BKc = {128, 128, 128, 0};
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// Light rotation angle
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SVECTOR lgtang = {0, 0, 0};
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// These will be used to store the light rotation matrix, cube rotation matrix, and composite light matrix.
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MATRIX rotlgt, rotcube, light;
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// Local Light Matrix : Direction and reach of each light source.
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MATRIX lgtmat = {
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// X Y Z
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0, -ONE, 0, // Lightsource 1 : here, the light source is at the Bottom-Left of the screen, and points into the screen.
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0, 0, 0, // Lightsource 2
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0, 0, 0, // Lightsource 3
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};
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// Local Color Matrix
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MATRIX cmat = {
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// L1 L2 L3
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4096, 0, 0, // R
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4096, 0, 0, // G
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4096, 0, 0 // B
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};
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// Prototypes
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void init(void);
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void display(void);
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void LoadTexture(TIM_FILE * tim, TIM_IMAGE * tparam);
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void init(){
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// Reset the GPU before doing anything and the controller
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PadInit(0);
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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); // x, y offset
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SetGeomScreen(CENTERX); // Distance between eye and screen
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// Set the display and draw environments
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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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SetDefDrawEnv(&draw[0], 0, SCREENYRES, SCREENXRES, SCREENYRES);
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SetDefDrawEnv(&draw[1], 0, 0, SCREENXRES, SCREENYRES);
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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 far color
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SetFarColor( BGc.r, BGc.g, BGc.b );
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// Set Ambient color
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SetBackColor( BKc.vx, BKc.vy, BKc.vz );
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// Set Color matrix
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SetColorMatrix(&cmat);
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// Set Fog settings
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SetFogNearFar( 128, 1024, CENTERX );
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setRGB0(&draw[0], 0, 0, 0);
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setRGB0(&draw[1], 0, 0, 0);
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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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// Init font system
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FntLoad(960, 0);
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FntOpen(MARGINX, MARGINY, SCREENXRES - MARGINX * 2, SCREENXRES - MARGINY * 2, 0, 512 );
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}
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void display(void){
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DrawSync(0);
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VSync(0);
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PutDispEnv(&disp[db]);
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PutDrawEnv(&draw[db]);
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DrawOTag(&ot[db][OTLEN - 1]);
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db = !db;
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nextpri = primbuff[db];
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}
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void LoadTexture(TIM_FILE * tim, TIM_IMAGE * tparam){ // This part is from Lameguy64's tutorial series : lameguy64.net/svn/pstutorials/chapter1/3-textures.html login/pw: annoyingmous
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OpenTIM((u_long*)tim); // Open the tim binary data, feed it the address of the data in memory
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ReadTIM(tparam); // This read the header of the TIM data and sets the corresponding members of the TIM_IMAGE structure
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LoadImage(tparam->prect, tparam->paddr); // Transfer the data from memory to VRAM at position prect.x, prect.y
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DrawSync(0); // Wait for the drawing to end
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if (tparam->mode & 0x8){ // check 4th bit // If 4th bit == 1, TIM has a CLUT
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LoadImage(tparam->crect, tparam->caddr); // Load it to VRAM at position crect.x, crect.y
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DrawSync(0); // Wait for drawing to end
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}
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}
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int main() {
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// Populate array with pointers to TIM data
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timFiles[0] = &_binary_TIM_cube_tim_start;
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timFiles[1] = &_binary_TIM_sky_tim_start;
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timFiles[2] = &_binary_TIM_bg_tim_start;
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// Pad values
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int pad, oldPad;
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// Set semi-transparency on (1) and off (0)
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int stpFlag = 1;
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// Set primitive semi-transparency rate - See LibOver47.pdf, p.107
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int stpRate = 0;
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// If set, rotate cube
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int rotateCube = 1;
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int offsetCube = 0;
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// Array of pointers to a POLY_G4 we iterate over
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POLY_GT3 * poly[NUM_PRIM];
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// Rotation vector
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SVECTOR rotVector={ 384, 0, 128, 0 };
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// Translation vector
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VECTOR transVector= { 0, 0, 256, 0};
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// BG sprt
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POLY_FT4 * bg;
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// Normalized UV coordinates for the X axis
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long normH = ((255 << 12) / SCREENXRES);
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// Init Disp/Drawenv, Font, etc.
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init();
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// Load textures to VRAM
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for (char tex = 0; tex < NUM_TEX; tex++){
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LoadTexture(timFiles[tex], &timImages[tex]);
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}
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// Main loop
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while (1) {
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// Work matrix
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MATRIX Work= {0} ;
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// Triangle counters array - one for each cube
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long curTriangle[3] = {0,0,0};
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// Clear the current OT
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ClearOTagR(ot[db], OTLEN);
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// Draw BG
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bg = (POLY_FT4 * )nextpri;
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SetPolyFT4(bg);
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bg->tpage = getTPage( timImages[2].mode&0x3, 0,
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timImages[2].prect->x,
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timImages[2].prect->y
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);
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if ( (timImages[2].mode & 0x3) < 2 ) {
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setClut( bg,
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timImages[2].crect->x,
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timImages[2].crect->y
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);
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}
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setRGB0(bg, 127,127,127);
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setUV4(bg, 0, 0,
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SCREENYRES, 0,
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0, SCREENYRES,
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SCREENYRES, SCREENYRES
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);
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setXY4(bg, 0 , 0,
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SCREENXRES, 0,
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0 , SCREENYRES,
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SCREENXRES, SCREENYRES);
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addPrim(ot[db][OTLEN-1], bg);
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nextpri += sizeof(POLY_FT4);
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// Rotate cube
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if(rotateCube) rotVector.vy += 10;
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// Find and apply light rotation matrix
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// Find rotmat from light angles
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RotMatrix_gte(&lgtang, &rotlgt);
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// Find rotmat from cube angles
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RotMatrix_gte(&rotVector, &rotcube);
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// RotMatrix cube * RotMatrix light
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MulMatrix0(&rotcube, &rotlgt, &rotlgt);
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// Light Matrix * RotMatrix light
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MulMatrix0(&lgtmat, &rotlgt, &light);
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// Set new light matrix
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SetLightMatrix(&light);
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// Apply Transl, Rot, then matrix
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RotMatrix(&rotVector, &Work);
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TransMatrix(&Work, &transVector);
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SetRotMatrix(&Work);
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SetTransMatrix(&Work);
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long p, OTz, Flag;
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// Draw NUM_PRIM primitives
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for (int i = 0; i < (modelCube.len * 3); i += 3) {
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// Set projection matrices
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transVector.vx = 0;
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TransMatrix(&Work, &transVector);
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SetRotMatrix(&Work);
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SetTransMatrix(&Work);
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// Cast nextpri as POLY_GT3
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poly[0] = (POLY_GT3 *)nextpri;
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poly[1] = (POLY_GT3 *)nextpri+sizeof(POLY_GT3);
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// Initialize the primitives
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SetPolyGT3(poly[0]);
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SetPolyGT3(poly[1]);
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// Reflection Cube
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// This cube has its UVs mapped directly to VRAM coordinates
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// We're using the framebuffers as a texture (0,0 and 0,256)
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// Get 256x256 texture page that's at x0, y0
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poly[1]->tpage = getTPage( 2, stpRate,
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0,
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!(db) << 8 // Here, we're using db's value that can be either 0 or 1 to determine the texture page Y coordinate.
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);
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// Set STP
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SetSemiTrans(poly[1], stpFlag);
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// Map coordinates from drawarea (320x240) to texture size (128x128) in fixed point math
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// x = x * (256 / 320) => ( x * ( 128 * 4096 ) / 320 ) / 4096
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// y = y * (240 / 240) => ( y * ( 240 * 4096 ) / 240 ) / 4096 => y * 2184 >> 12 -> y
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setUV3( poly[1],
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(poly[1]->x0 * normH) >> 12,
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poly[1]->y0 - (!(db) << 4) , // We're using db's value again to add a 16 pixels offset to the Y's coordinates of the UVs
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(poly[1]->x1 * normH) >> 12,
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poly[1]->y1 - (!(db) << 4), // We have to do that because the buffer is 240 high, whereas our texture page is 256, hence 256 - 240 == 16
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(poly[1]->x2 * normH) >> 12,
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poly[1]->y2 - (!(db) << 4)
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);
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// Draw "container" cube
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// This cube has a texture with transparent areas.
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// STP bit is set on PNG's alpha channel : img2tim -usealpha -org 320 0 -o cube.tim cube.png
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poly[0]->tpage = getTPage( timImages[0].mode&0x3, stpRate,
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timImages[0].prect->x,
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timImages[0].prect->y
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);
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// If 8/4bpp, load CLUT to vram
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if ( (timImages[0].mode & 0x3) < 2 ) {
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setClut( poly[0],
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timImages[0].crect->x,
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timImages[0].crect->y
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);
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}
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// Set UV coordinates
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setUV3(poly[0], modelCube.u[i].vx, modelCube.u[i].vy,
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modelCube.u[i+2].vx, modelCube.u[i+2].vy,
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modelCube.u[i+1].vx, modelCube.u[i+1].vy
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);
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// Rotate, translate, and project the vectors and output the results into a primitive
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// curTriangle, +1, +2 point to the vertices index of the triangle we're drawing.
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OTz = RotTransPers(&modelCube_mesh[ modelCube_index[ curTriangle[0] ] ] , ( long * ) &poly[1]->x0, &p, &Flag);
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OTz += RotTransPers(&modelCube_mesh[ modelCube_index[ curTriangle[0] + 2] ], ( long*) &poly[1]->x1, &p, &Flag);
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OTz += RotTransPers(&modelCube_mesh[ modelCube_index[ curTriangle[0] + 1] ], ( long * ) &poly[1]->x2, &p, &Flag);
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// Here we're only messing with the matrices so that the foreground cube can be moved independantly from the backgound one.
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// In real code, you don't want to do the same calculation twice !
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transVector.vx = offsetCube;
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TransMatrix(&Work, &transVector);
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SetRotMatrix(&Work);
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SetTransMatrix(&Work);
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OTz = RotTransPers(&modelCube_mesh[ modelCube_index[ curTriangle[0] ] ] , ( long * ) &poly[0]->x0, &p, &Flag);
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OTz += RotTransPers(&modelCube_mesh[ modelCube_index[ curTriangle[0] + 2] ], ( long*) &poly[0]->x1, &p, &Flag);
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OTz += RotTransPers(&modelCube_mesh[ modelCube_index[ curTriangle[0] + 1] ], ( long * ) &poly[0]->x2, &p, &Flag);
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// The right way to do it is re-using the results from the first RotTransPer() batch
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// i.e commenting lines 273 to 280 and uncommenting lines 284 to 289
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//~ poly[0]->x0 = poly[1]->x0;
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//~ poly[0]->y0 = poly[1]->y0;
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//~ poly[0]->x1 = poly[1]->x1;
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//~ poly[0]->y1 = poly[1]->y1;
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//~ poly[0]->x2 = poly[1]->x2;
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//~ poly[0]->y2 = poly[1]->y2;
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// Average OTz value for 3 vertices
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// OTz is 1/4 of screen to vertex length
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OTz /= 3;
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// Work color vectors
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// This is the hue of the transparent cube
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CVECTOR prismCol = {0xff,0xff,0x0,0x0};
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// This will store the result of the depth cueing.
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CVECTOR outCol, outCol1, outCol2 = { 0,0,0,0 };
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// Find local color from three normal vectors and perform depth cueing.
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gte_NormalColorDpq3( &modelCube.n[i+0],
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&modelCube.n[i+2],
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&modelCube.n[i+3],
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&prismCol, p, &outCol, &outCol1, &outCol2);
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// Set vertex colors on transparent/background cube
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setRGB0(poly[1], outCol.r, outCol.g , outCol.b);
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setRGB1(poly[1], outCol1.r, outCol1.g, outCol1.b);
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setRGB2(poly[1], outCol2.r, outCol2.g, outCol2.b);
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// Non-transparent/foreground cube color
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// Find local color from three normal vectors and perform depth cueing.
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gte_NormalColorDpq( &modelCube.n[i+0], &modelCube.c[i+0], p, &outCol);
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gte_NormalColorDpq( &modelCube.n[i+2], &modelCube.c[i+2], p, &outCol2);
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gte_NormalColorDpq( &modelCube.n[i+1], &modelCube.c[i+1], p, &outCol1);
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// Set vertex colors
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setRGB0(poly[0], outCol.r, outCol.g , outCol.b);
|
||
|
|
setRGB1(poly[0], outCol1.r, outCol1.g, outCol1.b);
|
||
|
|
setRGB2(poly[0], outCol2.r, outCol2.g, outCol2.b);
|
||
|
|
// If OTz is in range (not too close)
|
||
|
|
if ((OTz > 0) && (OTz < OTLEN))
|
||
|
|
// Add to ordering table, at index OTz-2
|
||
|
|
AddPrim(&ot[ db ][ OTz-2 ], poly[0]);
|
||
|
|
AddPrim(&ot[ db ][ OTz-2 ], poly[1]);
|
||
|
|
// Increment next primitive address
|
||
|
|
nextpri += sizeof(POLY_GT3)*2;
|
||
|
|
// Increment to next triangle
|
||
|
|
curTriangle[0] += 3;
|
||
|
|
curTriangle[1] += 3;
|
||
|
|
}
|
||
|
|
// Get pad input
|
||
|
|
pad = PadRead(0);
|
||
|
|
// If select button is used
|
||
|
|
if ( pad & PADselect && !(oldPad & PADselect) ){
|
||
|
|
// Flip STP flag
|
||
|
|
stpFlag = !stpFlag;
|
||
|
|
// Set flag to avoir misfire
|
||
|
|
oldPad = pad;
|
||
|
|
}
|
||
|
|
// Reset flag when button released
|
||
|
|
if ( !(pad & PADselect) && oldPad & PADselect) {
|
||
|
|
oldPad = pad;
|
||
|
|
}
|
||
|
|
// If start button is used
|
||
|
|
if ( pad & PADstart && !( oldPad & PADstart ) ){
|
||
|
|
// Switch STP rates
|
||
|
|
stpRate > 2 ? stpRate = 0 : stpRate++;
|
||
|
|
// Set flag to avoir misfire
|
||
|
|
oldPad = pad;
|
||
|
|
}
|
||
|
|
// Reset flag when button released
|
||
|
|
if (!(pad & PADstart) && oldPad & PADstart) {
|
||
|
|
oldPad = pad;
|
||
|
|
}
|
||
|
|
if ( pad & PADRdown && !( oldPad & PADRdown ) ){
|
||
|
|
// Switch STP rates
|
||
|
|
offsetCube = 0;
|
||
|
|
// Set flag to avoir misfire
|
||
|
|
oldPad = pad;
|
||
|
|
}
|
||
|
|
// Reset flag when button released
|
||
|
|
if (!(pad & PADRdown) && oldPad & PADRdown) {
|
||
|
|
oldPad = pad;
|
||
|
|
}
|
||
|
|
if ( pad & PADLright && !( oldPad & PADLright ) ){
|
||
|
|
offsetCube += 6;
|
||
|
|
}
|
||
|
|
if ( pad & PADLleft && !( oldPad & PADLleft ) ){
|
||
|
|
offsetCube -= 6;
|
||
|
|
}
|
||
|
|
FntPrint("Hello fx !\n");
|
||
|
|
FntPrint("Select: STP on/off\nStart: Cycle STP rates\nLeft/Right: Move FG cube.\nX: Reset cube pos\n");
|
||
|
|
FntPrint("STP : %d\n", stpFlag);
|
||
|
|
FntPrint("STP rate : %d\n", stpRate);
|
||
|
|
FntFlush(-1);
|
||
|
|
display();
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|