somehow got this to work at >1000 FPS

Makefile

@@ -1,5 +1,5 @@
 CC = gcc
-FLAGS = -Wall -Wextra -Wpedantic -g
+FLAGS = -O2 -Wall -Wextra -Wpedantic -g
 LFLAGS = -lSDL2 -lSDL2_image -lm -lncurses
 
 all: bin/back

src/display.c

@@ -386,6 +386,13 @@ SDL_Vertex construct_vertex(double px, double py, int r, int g, int b) {
     return vtx ;
 }
 
+    double px0; double py0; double pz0;
+    double px1; double py1; double pz1;
+    double px2; double py2; double pz2;
+        double fpx0; double fpy0; double fpz0;
+        double fpx1; double fpy1; double fpz1;
+        double mpx0; double mpy0; double mpz0;
+        double mpx1; double mpy1; double mpz1;
 void renderTriangle(
     SDL_Renderer* renderer,
     double x0, double y0, double z0,
@@ -393,9 +400,6 @@ void renderTriangle(
     double x2, double y2, double z2,
     int red, int green, int blue
 ) {
-    double px0; double py0; double pz0;
-    double px1; double py1; double pz1;
-    double px2; double py2; double pz2;
     project_to_camera(x0, y0, z0, &px0, &py0, &pz0);
     project_to_camera(x1, y1, z1, &px1, &py1, &pz1);
     project_to_camera(x2, y2, z2, &px2, &py2, &pz2);
@@ -407,10 +411,6 @@ void renderTriangle(
         };
         SDL_RenderGeometry(renderer, NULL, vtxs, 3, NULL, 0);
     } else if((pz0 >= draw_constant) + (pz1 >= draw_constant) + (pz2 >= draw_constant) == 2) {
-        double fpx0; double fpy0; double fpz0;
-        double fpx1; double fpy1; double fpz1;
-        double mpx0; double mpy0; double mpz0;
-        double mpx1; double mpy1; double mpz1;
         if(pz0 < draw_constant) {     
             // pz1 >= draw_constant and pz2 >+ draw_constant
             fpx0 = px1 ; fpy0 = py1 ; fpz0 = pz1 ;
@@ -445,7 +445,7 @@ void renderTriangle(
                 convex_pt(y2, y1, (pz2 - draw_constant)/(pz2 - pz1)), 
                 convex_pt(z2, z1, (pz2 - draw_constant)/(pz2 - pz1)), 
             &mpx1, &mpy1, &mpz1) ;
-        } else if(pz2 < draw_constant) {     
+        } else /*if(pz2 < draw_constant)*/ {     
             // pz1 >= draw_constant and pz0 >+ draw_constant
             fpx0 = px0 ; fpy0 = py0 ; fpz0 = pz0 ;
             fpx1 = px1 ; fpy1 = py1 ; fpz1 = pz1 ;
@@ -525,9 +525,9 @@ void renderTriangleRotated(
     int red, int green, int blue,
     cube_0 cb
 ) {
-    double px0; double py0; double pz0;
+    /*double px0; double py0; double pz0;
     double px1; double py1; double pz1;
-    double px2; double py2; double pz2;
+    double px2; double py2; double pz2;*/
     rotate_cube(x0, y0, z0, &px0, &py0, &pz0, cb);
     rotate_cube(x1, y1, z1, &px1, &py1, &pz1, cb);
     rotate_cube(x2, y2, z2, &px2, &py2, &pz2, cb);
@@ -630,15 +630,9 @@ void drawCurrentRoom(SDL_Renderer* renderer) {
     insertionSort_cb(current_room->map, current_room->map_size);
     insertionSort_tp(current_room->tps, current_room->tps_size);
     for(int k = 0; k < current_room->map_size; k++) {
-        SDL_SetRenderDrawColor(renderer, current_room->map[k].red/2, current_room->map[k].green/2, current_room->map[k].blue/2, 255);
-        drawOutlineOfCube_0(renderer, current_room->map[k]);
-        
         drawFullCube(renderer, current_room->map[k]);
     }
     for(int k = 0; k < current_room->tps_size; k++) {
-        SDL_SetRenderDrawColor(renderer, current_room->tps[k].hitbox.red/2,  current_room->tps[k].hitbox.green/2,  current_room->tps[k].hitbox.blue/2, 255);
-        drawOutlineOfCube_0(renderer, current_room->tps[k].hitbox);
-        
         drawFullCube(renderer, current_room->tps[k].hitbox);
     }
 }

templates/room_2

@@ -14,6 +14,6 @@ Teleporters :
 [-5.0, 1.0, 9.0, 10.0, 2.0, 1.0, 0.0, 0.0, 0, 0, 255; 1, 0]
 
 Weight :
-10
+30
 
 $