From 5e94c9fb603dc4648fe6ab4c153ba4114b6bb486 Mon Sep 17 00:00:00 2001
From: Kelly Rauchenberger <fefferburbia@gmail.com>
Date: Tue, 5 Jun 2018 19:01:26 -0400
Subject: improved overlapping lights

radius of light seems kind of diminished though.
---
 src/main.cpp | 63 +++++++++++++++++++++++++++++++++++++-----------------------
 1 file changed, 39 insertions(+), 24 deletions(-)

diff --git a/src/main.cpp b/src/main.cpp
index dacc646..03e7cda 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -199,7 +199,8 @@ void render(
   }
 
   SDL_SetRenderTarget(ren, playerFade.get());
-  SDL_SetRenderDrawColor(ren, 0, 0, 0, 255);
+  SDL_SetRenderDrawBlendMode(ren, SDL_BLENDMODE_NONE);
+  SDL_SetRenderDrawColor(ren, 0, 0, 0, 0);
   SDL_RenderClear(ren);
   SDL_RenderCopy(ren, origFade.get(), nullptr, nullptr);
 
@@ -218,7 +219,8 @@ void render(
 
   SDL_SetRenderTarget(ren, lampFade.get());
 
-  SDL_SetRenderDrawColor(ren, 0, 0, 0, 255);
+  SDL_SetRenderDrawBlendMode(ren, SDL_BLENDMODE_NONE);
+  SDL_SetRenderDrawColor(ren, 0, 0, 0, 0);
   SDL_RenderClear(ren);
   SDL_RenderCopy(ren, origFade.get(), nullptr, nullptr);
 
@@ -241,7 +243,8 @@ void render(
 
   SDL_SetRenderTarget(ren, dustFade.get());
 
-  SDL_SetRenderDrawColor(ren, 0, 0, 0, 255);
+  SDL_SetRenderDrawBlendMode(ren, SDL_BLENDMODE_NONE);
+  SDL_SetRenderDrawColor(ren, 0, 0, 0, 0);
   SDL_RenderClear(ren);
   SDL_RenderCopy(ren, origFade.get(), nullptr, nullptr);
 
@@ -276,14 +279,14 @@ void render(
       if ((game.player_x == x && game.player_y == y) && game.renderPlayer)
       {
         SDL_SetRenderDrawColor(ren, 255, 255, 0, 255);
-        /*} else if (!game.map.at(x,y).lit)
+      } else if (!game.map.at(x,y).lit)
       {
         if (drawDark)
         {
           SDL_SetRenderDrawColor(ren, 40, 40, 40, 255);
         } else {
           draw = false;
-        }*/
+        }
       } else {
         int alpha = 255;
 
@@ -346,7 +349,7 @@ void render(
   }
 
   SDL_SetRenderTarget(ren, mask.get());
-  SDL_SetRenderDrawColor(ren, 0, 0, 0, 255);
+  SDL_SetRenderDrawColor(ren, 0, 0, 0, 0);
   SDL_RenderClear(ren);
 
   for (int y = game.map.getTop(); y < game.map.getBottom(); y++)
@@ -369,40 +372,52 @@ void render(
         }
 
         SDL_SetRenderTarget(ren, sourceMask.get());
-        SDL_SetRenderDrawColor(ren, 0, 0, 0, 255);
+        SDL_SetRenderDrawBlendMode(ren, SDL_BLENDMODE_NONE);
+        SDL_SetRenderDrawColor(ren, 0, 0, 0, 0);
         SDL_RenderClear(ren);
 
-        SDL_SetRenderDrawColor(ren, 255, 255, 255, 255);
-
-        for (const coord& xy : game.map.at(x,y).litTiles)
-        {
-          SDL_Rect rect {
-            game.map.getTrueX(std::get<0>(xy)) * TILE_WIDTH,
-            game.map.getTrueY(std::get<1>(xy)) * TILE_HEIGHT,
-            TILE_WIDTH,
-            TILE_HEIGHT};
-
-          SDL_RenderFillRect(ren, &rect);
-        }
+        int fadeX = game.map.getTrueX(x) - game.map.at(x,y).lightRadius;
+        int fadeY = game.map.getTrueY(y) - game.map.at(x,y).lightRadius;
+        int fadeRight = game.map.getTrueX(x) + game.map.at(x,y).lightRadius;
+        int fadeBottom = game.map.getTrueY(y) + game.map.at(x,y).lightRadius;
 
         SDL_Rect fadeRect {
-          (game.map.getTrueX(x) - game.map.at(x,y).lightRadius) * TILE_WIDTH,
-          (game.map.getTrueY(y) - game.map.at(x,y).lightRadius) * TILE_HEIGHT,
+          fadeX * TILE_WIDTH,
+          fadeY * TILE_HEIGHT,
           (game.map.at(x,y).lightRadius * 2 + 1) * TILE_WIDTH,
           (game.map.at(x,y).lightRadius * 2 + 1) * TILE_HEIGHT};
 
         if (game.map.at(x,y).lightType == Source::Lamp)
         {
-          SDL_SetTextureBlendMode(lampFade.get(), SDL_BLENDMODE_MOD);
+          SDL_SetTextureBlendMode(lampFade.get(), SDL_BLENDMODE_NONE);
           SDL_RenderCopy(ren, lampFade.get(), nullptr, &fadeRect);
         } else if (game.map.at(x,y).lightType == Source::Player) {
-          SDL_SetTextureBlendMode(playerFade.get(), SDL_BLENDMODE_MOD);
+          SDL_SetTextureBlendMode(playerFade.get(), SDL_BLENDMODE_NONE);
           SDL_RenderCopy(ren, playerFade.get(), nullptr, &fadeRect);
         } else if (game.map.at(x,y).lightType == Source::Dust) {
-          SDL_SetTextureBlendMode(dustFade.get(), SDL_BLENDMODE_MOD);
+          SDL_SetTextureBlendMode(dustFade.get(), SDL_BLENDMODE_NONE);
           SDL_RenderCopy(ren, dustFade.get(), nullptr, &fadeRect);
         }
 
+        SDL_SetRenderDrawColor(ren, 0, 0, 0, 0);
+
+        for (int sy = fadeY; sy < fadeBottom; sy++)
+        {
+          for (int sx = fadeX; sx < fadeRight; sx++)
+          {
+            if (!game.map.at(x,y).litTiles.count({sx, sy}))
+            {
+              SDL_Rect rect {
+                game.map.getTrueX(sx) * TILE_WIDTH,
+                game.map.getTrueY(sy) * TILE_HEIGHT,
+                TILE_WIDTH,
+                TILE_HEIGHT};
+
+              SDL_RenderFillRect(ren, &rect);
+            }
+          }
+        }
+
         SDL_SetRenderTarget(ren, mask.get());
         SDL_SetTextureBlendMode(sourceMask.get(), SDL_BLENDMODE_ADD);
         SDL_RenderCopy(ren, sourceMask.get(), nullptr, nullptr);
-- 
cgit 1.4.1