update examples to use the new const eval syntax

examples/life.csn

@@ -10,23 +10,22 @@
 
     (def GENERATION_MS 200)
 
-    ; Real pixel size
-    (sc-init 400 400)
-    ; Upscaling factor (bug pixels)
-    (sc-opt SCREEN_UPSCALE 10)
-
-    ; Number of big pixels
+    ; Number of pixels
     (def W 40)
     (def H 40)
-
-    ; !!! If you change size, also update the following constants.
-    ;     Compile-time math is not implemented yet.
-
-    (def XMAX 39) ; W-1
-    (def YMAX 39) ; H-1
-    (def NCELLS 1600) ; W*H
+    (def UPSCALE 10)
 
     ; --- end of config ---
+
+    ; Real pixel size
+    (sc-init (=mul UPSCALE W) (=mul UPSCALE H))
+    ; Upscaling factor (bug pixels)
+    (sc-opt SCREEN_UPSCALE UPSCALE)
+
+    (def XMAX (=sub W 1))
+    (def YMAX (=sub H 1))
+    (def NCELLS (=mul W H))
+
     (sc-opt SCREEN_AUTO_BLIT 0)
 
     (sc-erase 0) ; all black

examples/mandelbrot/mandelbrot-full.csn

@@ -1,9 +1,12 @@
 (
-    (sc-init 800 600)
-    (sc-opt SCREEN_AUTOBLIT 0)
+    ; High resolution mandelbrot
+
     (def W 800)
     (def H 600)
-    (def MAXITER 50)
+    (def MAXITER 50) ; Increase for more detail but slower render
+
+    (sc-init W H)
+    (sc-opt SCREEN_AUTOBLIT 0)
 
     (sym gradient r9)
     (sym asciigr r10)

examples/mandelbrot/mandelbrot-interactive.csn

@@ -1,10 +1,15 @@
 (
-    (sc-init 1024 768)
-    (sc-opt SCREEN_AUTOBLIT 0)
     (def W 1024)
     (def H 768)
-    (sym MAXITER g0)
-    (ld MAXITER 50)
+    (def DEF_MAXITER 50)
+
+    ; ---
+
+    (sc-init W H)
+    (sc-opt SCREEN_AUTOBLIT 0)
+    (sym maxiter g0)
+
+    (ld maxiter DEF_MAXITER)
 
     (lds @cout "Interactive Mandelbrot\n")
     (lds @cout "----------------------\n")
@@ -86,7 +91,7 @@
         (ld x col)
         (:col)
             (call pixel x y px py scale)
-            (sub r0 MAXITER 1)
+            (sub r0 maxiter 1)
             (rcmp res0 1 r0
                 (eq?
                     (mod r0 res0 16)
@@ -166,16 +171,16 @@
 
             ; R iter+
             (sc-key r0 KEY_R (nz?
-                (add MAXITER 50)
-                (lds @cout "ITER=") (call printnum MAXITER) (ld @cout '\n')                
+                (add maxiter 50)
+                (lds @cout "ITER=") (call printnum maxiter) (ld @cout '\n')
                 (mslp 200) ; Avoid unexpected rapid change
             ))
 
             ; F iter-
             (sc-key r0 KEY_F (nz?
-                (cmp MAXITER 50)
-                (sub.gt MAXITER 50)
-                (lds @cout "ITER=") (call printnum MAXITER) (ld @cout '\n')      
+                (cmp maxiter 50)
+                (sub.gt maxiter 50)
+                (lds @cout "ITER=") (call printnum maxiter) (ld @cout '\n')
                 (mslp 200) ; Avoid unexpected rapid change
             ))
 
@@ -258,7 +263,7 @@
         (sym iter r4)
 
         (:iter)
-            (cmp iter MAXITER)
+            (cmp iter maxiter)
             (j.eq :end)
             (fmul r0 x x)
             (fmul r1 y y)

examples/mandelbrot/mandelbrot-lowres.csn

@@ -1,11 +1,15 @@
 (
-    (sc-init 1024 768)
-    (sc-opt SCREEN_AUTOBLIT 0)
-    (sc-opt SCREEN_UPSCALE 8)
-    (def W 128)
-    (def H 96)
+    (def PX_W 1024)
+    (def PX_H 768)
+    (def UPSCALE 8)
     (def MAXITER 50)
 
+    (sc-init PX_W PX_H)
+    (sc-opt SCREEN_AUTOBLIT 0)
+    (sc-opt SCREEN_UPSCALE UPSCALE)
+    (def W (=div PX_W UPSCALE))
+    (def H (=div PX_H UPSCALE))
+
     (sym gradient r9)
     (sym asciigr r10)