corrected GTE init and vectors

Makefile

@@ -1,4 +1,4 @@
-#~ ## Hello world
+## Hello world
 TARGET = hello_world
 TYPE = ps-exe
 
@@ -26,7 +26,7 @@ SRCS = hello_world.c \
 #~ SRCS = hello_2pads.c \
 #~ ../common/crt0/crt0.s \
 
-#~ ## Hello poly
+## Hello poly
 #~ TARGET = hello_poly
 #~ TYPE = ps-exe
 
@@ -76,7 +76,7 @@ SRCS = hello_world.c \
 #~ VAG/hello.vag
 #~ VAG/poly.vag
 
-#~ ## Poly fun !
+## Poly fun !
 #~ TARGET = fun_with_poly
 #~ TYPE = ps-exe
 

hello_poly.c

@@ -73,8 +73,8 @@ void init(void)
     // Initialize and setup the GTE
 	
     InitGeom();
-	SetGeomOffset(0,0);
+	SetGeomOffset(CENTERX,CENTERY);
-	SetGeomScreen(1);
+	SetGeomScreen(CENTERX);
     
     SetDefDispEnv(&disp[0], 0, 0, SCREENXRES, SCREENYRES);
     SetDefDispEnv(&disp[1], 0, SCREENYRES, SCREENXRES, SCREENYRES);
@@ -128,7 +128,8 @@ int main(void)
     
     POLY_F4 *poly = {0};                            // pointer to a POLY_F4 
     SVECTOR RotVector = {0, 0, 0};                  // Initialize rotation vector {x, y, z}
-    VECTOR  MovVector = {CENTERX, CENTERY, 0};      // Initialize translation 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 
@@ -140,6 +141,7 @@ int main(void)
     
     long polydepth;
     long polyflag;
+    long OTz;
     
     init();
     
@@ -152,7 +154,8 @@ int main(void)
         // Set transform matrices for this polygon
                 
         RotMatrix(&RotVector, &PolyMatrix);           // Apply rotation matrix
-        TransMatrix(&PolyMatrix, &MovVector);         // Apply translation matrix   
+        TransMatrix(&PolyMatrix, &MovVector);
+        ScaleMatrix(&PolyMatrix, &ScaleVector);         // Apply translation matrix   
         
         SetRotMatrix(&PolyMatrix);                    // Set default rotation matrix
         SetTransMatrix(&PolyMatrix);                  // Set default transformation matrix
@@ -160,7 +163,17 @@ int main(void)
         setPolyF4(poly);                              // Initialize poly as a POLY_F4 
         setRGB0(poly, 255, 0, 255);                   // Set poly color
 
-        RotTransPers4(
+        
+        // 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,
@@ -168,7 +181,10 @@ int main(void)
                     );                                // Perform coordinate and perspective transformation for 4 vertices
         
         
-        RotVector.vz+=16;                              // Apply rotation on Z-axis. On PSX, the Z-axis is pointing away from the screen.  
+        
+        
+        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
         

hello_poly_ft.c

@@ -1,6 +1,18 @@
 // 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>
@@ -80,8 +92,8 @@ void init(void)
     // Initialize and setup the GTE
 	
     InitGeom();
-	SetGeomOffset(0,0);
+	SetGeomOffset(CENTERX,CENTERY);
-	SetGeomScreen(1);
+	SetGeomScreen(CENTERX);
     
     SetDefDispEnv(&disp[0], 0, 0, SCREENXRES, SCREENYRES);
     SetDefDispEnv(&disp[1], 0, SCREENYRES, SCREENXRES, SCREENYRES);
@@ -133,9 +145,10 @@ int main(void)
     
     MATRIX IDMATRIX = identity(3);                  // Generate 3x3 identity matrix
     
-    POLY_FT4 *poly = {0};                            // pointer to a POLY_G4 
+    POLY_FT4 *poly = {0};                           // pointer to a POLY_G4 
     SVECTOR RotVector = {0, 0, 0};                  // Initialize rotation vector {x, y, z}
-    VECTOR  MovVector = {CENTERX, CENTERY, 0};      // Initialize translation vector {x, y, z}
+    VECTOR  MovVector = {0, 0, CENTERX/2, 0};               // Initialize translation vector {x, y, z, pad}
+    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 
@@ -148,6 +161,8 @@ int main(void)
     long polydepth;
     long polyflag;
     
+    int ping = 0;
+    
     init();
     
     LoadTexture(_binary_TIM_bousai_tim_start, &bousai);
@@ -162,6 +177,7 @@ int main(void)
                 
         RotMatrix(&RotVector, &PolyMatrix);           // Apply rotation matrix
         TransMatrix(&PolyMatrix, &MovVector);         // Apply translation matrix   
+        ScaleMatrix(&PolyMatrix, &ScaleVector);       // Apply scale matrix   
         
         SetRotMatrix(&PolyMatrix);                    // Set default rotation matrix
         SetTransMatrix(&PolyMatrix);                  // Set default transformation matrix
@@ -181,7 +197,25 @@ int main(void)
         
         setUV4(poly, 0, 0, 0, 144, 144, 0, 144, 144);  // Set UV coordinates in order Top Left, Bottom Left, Top Right, Bottom Right 
 
-        RotVector.vz+=16;                              // Apply rotation on Z-axis. On PSX, the Z-axis is pointing away from the screen. 
+        
+        // Let's have some fun on the Z axis
+
+        if(!ping){
+            if (MovVector.vz < CENTERX){               // While Poly position on Z axis is < 160, push it
+                MovVector.vz += 1;                     // Push on Z axis
+            } else {
+                ping = !ping;                          // Switch ping value
+            }
+        }
+        
+        if(ping){
+            if (MovVector.vz > CENTERX/2){              // While Poly position on Z axis is > 80, pull it
+                MovVector.vz -= 1;                      // Pull on Z axis
+            } else {
+                ping = !ping;                           // Switch ping value
+            }
+        }
+            
             
         addPrim(ot[db], poly);                         // add poly to the Ordering table
         

hello_poly_gt.c

@@ -1,6 +1,19 @@
 // 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>
@@ -81,7 +94,7 @@ void init(void)
 	
     InitGeom();
 	SetGeomOffset(CENTERX,CENTERY);
-	SetGeomScreen(8);
+	SetGeomScreen(CENTERX);
     
     SetDefDispEnv(&disp[0], 0, 0, SCREENXRES, SCREENYRES);
     SetDefDispEnv(&disp[1], 0, SCREENYRES, SCREENXRES, SCREENYRES);
@@ -136,7 +149,7 @@ int main(void)
     
     POLY_GT4 *poly = {0};                           // pointer to a POLY_G4 
     SVECTOR RotVector = {0, 0, 0};                  // Initialize rotation vector {x, y, z}
-    VECTOR  MovVector = {0,0, 12};                   // Initialize translation vector {x, y, z}
+    VECTOR  MovVector = {0, 0, 120, 0};                   // Initialize translation vector {x, y, z}
                                                     
     SVECTOR VertPos[4] = {                          // Set initial vertices position relative to 0,0 - see here : https://psx.arthus.net/docs/poly_f4.jpg
             {-32, -32, 0 },                         // Vert 1 
@@ -186,7 +199,7 @@ int main(void)
         
         setUV4(poly, 0, 0, 0, 144, 144, 0, 144, 144);  // Set UV coordinates in order Top Left, Bottom Left, Top Right, Bottom Right 
         
-        RotVector.vz += 16;                              // Apply rotation on Z-axis. On PSX, the Z-axis is pointing away from the screen. 
+        RotVector.vx += 8;                              // 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