From 915c9167eb319064207e9d0e8038d45fd0976203 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Miloslav=20=C4=8C=C3=AD=C5=BE?= <tastyfish@seznam.cz>
Date: Mon, 24 Sep 2018 18:58:16 +0200
Subject: [PATCH] Precompute gradients (FPS++)

---
 demo1.cpp | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/demo1.cpp b/demo1.cpp
index 03bc0b2..b10dd1c 100644
--- a/demo1.cpp
+++ b/demo1.cpp
@@ -38,6 +38,9 @@ Player player;
 
 Sprite sprites[SPRITES];
 
+unsigned char floorGradient[15];
+unsigned char ceilGradient[15];
+
 /// For each level square says the texture index.
 const unsigned char levelTexture[] =
 {
@@ -1023,8 +1026,8 @@ inline void pixelFunc(RCL_PixelInfo *pixel)
   }
   else
     color = pixel->isFloor ?
-          rgbToIndex(intensity/2,intensity,intensity/3) :
-          rgbToIndex(intensity,intensity/2,0);
+      floorGradient[RCL_clamp(intensity,0,14)] :
+      ceilGradient[RCL_clamp(intensity,0,14)];
 
   putSubsampledPixel(pixel->position.x,pixel->position.y,color);
 }
@@ -1094,6 +1097,9 @@ int main()
 {
   initGeneral();
 
+  initGradient(floorGradient,rgbToIndex(3,7,0));
+  initGradient(ceilGradient,rgbToIndex(6,2,1));
+
   defaultConstraints.maxHits = 8;
   defaultConstraints.maxSteps = 10;