Downsample when blurring bloom

shader/texture/bloomBlur.frag

@@ -3,10 +3,12 @@ in vec2 vTexPos;
 out vec4 fColor;
 const vec2 winSize = vec2 (300,300);
 // note that the above opening bracket should be the first in this file
+// this is so that the window size can be extracted and the shader recompiled on
+// the fly
 uniform sampler2D screenTexture;
 
-const float hOff = 4.0 / winSize.x;
-const float vOff = 4.0 / winSize.y;
+const float hOff = 3.0 / winSize.x;
+const float vOff = 3.0 / winSize.y;
 const float frac = 1.0 / 9;
 const vec2 off[9] = vec2[]
     ( vec2( vOff,hOff )

src/Dodge/Render.hs

@@ -104,21 +104,21 @@ doDrawing pdata w = do
     renderLayer 5 shadV layerCounts
 
     depthMask $= Enabled
+    -- this is not ideal if the original is not divisible by 2
+    viewport $= (Position 0 0
+        , divideSize (2 * (w ^. config . shadow_resolution)) $ Size (round $ fstV2 wins) (round $ sndV2 wins))
     bindFramebuffer Framebuffer $= fst (_fboFourth1 pdata)
-    --viewport $= (Position 0 0, Size 300 300)
     depthFunc $= Just Always
     textureBinding Texture2D $= Just (snd $ _fboBloom pdata)
     blend $= Disabled
     drawShader (_bloomBlurShader pdata) 4
     replicateM_ 3 $ pingPongBetween (_fboFourth1 pdata) (_fboFourth2 pdata) (_bloomBlurShader pdata)
---    viewport $= (Position 0 0, Size (round $ fstV2 wins) (round $ sndV2 wins))
     blend $= Enabled
+    viewport $= (Position 0 0
+        , divideSize (w ^. config . shadow_resolution) $ Size (round $ fstV2 wins) (round $ sndV2 wins))
 
     bindFramebuffer Framebuffer $= fst (_fboLighting pdata)
-    --viewport $= (Position 0 0
-    --    , divideSize (w ^. config . shadow_resolution) $ Size (round $ fstV2 wins) (round $ sndV2 wins))
     createLightMap pdata lightPoints nWalls nSils nsurfVs 
-    --viewport $= (Position 0 0, Size (round $ fstV2 wins) (round $ sndV2 wins))
     colorMask $= Color4 Enabled Enabled Enabled Enabled
     clearColor $= Color4 0 0 0 0
 
@@ -138,8 +138,10 @@ doDrawing pdata w = do
     textureBinding Texture2D $= Just (snd $ _fboColor pdata)
     drawShader (_colorBlurShader pdata) 4
     --textureBinding Texture2D $= Just (snd3 $ _fbo2 pdata)
+    --blendFunc $= (SrcAlpha, One)
     textureBinding Texture2D $= Just (snd $ _fboFourth1 pdata)
     drawShader (_fullscreenShader pdata) 4
+    blendFunc $= (SrcAlpha, OneMinusSrcAlpha)
     textureBinding Texture2D $= Just (snd $ _fboBloom pdata)
     drawShader (_fullscreenShader pdata) 4
 

src/Framebuffer/Update.hs

@@ -23,10 +23,11 @@ sizeFBOs
     -> IO (RenderData)
 sizeFBOs xsize ysize xfull yfull rdata = do
     resizeRBO (_rboBaseBloom rdata) xsize ysize
-    resizeRBO (_rboLighting rdata)   xsize ysize
-    rdata' <- foldM (updateFBOTO xsize ysize) rdata [fboBase, fboBloom, fboColor,fboFourth1,fboFourth2]
-    rdata'' <- foldM (updateFBOTO xfull yfull) rdata' [fbo2, fbo3]
-    updateFBOTO xsize ysize rdata'' fboLighting
+    resizeRBO (_rboLighting rdata)  xsize ysize
+    rdata' <- foldM (updateFBOTO xsize ysize minMagFilter) rdata [fboBase, fboColor,fboLighting]
+    rdata'' <- updateFBOTO xsize ysize minMagFilter rdata' fboBloom
+    rdata''' <- foldM (updateFBOTO xfull yfull minMagFilter) rdata'' [fbo2, fbo3]
+    foldM (updateFBOTO (xsize `div` 2) (ysize `div` 2) linMinMagFilter) rdata''' [fboFourth1,fboFourth2]
 
 resizeRBO
     :: RenderbufferObject
@@ -42,19 +43,21 @@ resizeRBO rboName xsize ysize = do
 updateFBOTO
     :: Int
     -> Int
+    -> ((TextureFilter, Maybe TextureFilter),TextureFilter)
     -> RenderData
     -> ALens' RenderData (FramebufferObject, TextureObject)
     -> IO (RenderData)
-updateFBOTO xsize ysize pdata target = do
-    newfbo2 <- resizeFBOTO (pdata ^# target) xsize ysize
+updateFBOTO xsize ysize mmfilt pdata target = do
+    newfbo2 <- resizeFBOTO (pdata ^# target) xsize ysize mmfilt
     return $ storing target newfbo2 pdata
 
 resizeFBOTO
     :: (FramebufferObject , TextureObject)
     -> Int
     -> Int
+    -> ((TextureFilter, Maybe TextureFilter),TextureFilter)
     -> IO (FramebufferObject, TextureObject)
-resizeFBOTO (fboName,toOld) xsize ysize = do
+resizeFBOTO (fboName,toOld) xsize ysize mmfilt = do
     bindFramebuffer Framebuffer $= fboName
     let xsize' = fromIntegral xsize
         ysize' = fromIntegral ysize
@@ -62,7 +65,7 @@ resizeFBOTO (fboName,toOld) xsize ysize = do
     toName <- genObjectName
     textureBinding Texture2D $= Just toName
     glTexStorage2D GL_TEXTURE_2D 1 GL_RGBA8 xsize' ysize'
-    textureFilter Texture2D $= minMagFilter
+    textureFilter Texture2D $= mmfilt
     framebufferTexture2D Framebuffer (ColorAttachment 0) Texture2D toName 0
     fboStatus <- framebufferStatus Framebuffer
     putStrLn $ "after resize, framebuffer status:" ++ show fboStatus
@@ -71,3 +74,5 @@ resizeFBOTO (fboName,toOld) xsize ysize = do
 minMagFilter :: ((TextureFilter, Maybe TextureFilter),TextureFilter)
 minMagFilter = ((Nearest,Nothing),Nearest)
 
+linMinMagFilter :: ((TextureFilter, Maybe TextureFilter),TextureFilter)
+linMinMagFilter = ((Linear',Nothing),Linear')

src/Preload/Update.hs

@@ -34,7 +34,7 @@ renderDataResizeUpdate xsize ysize xfull yfull rdata = do
     bbFrag <- BS.readFile "shader/texture/bloomBlur.frag"
     let (bh,bmid) = BS.breakSubstring "(" bbFrag
         (_,btt) = BS.breakSubstring ")" bmid
-        bbFrag' = BS.append bh $ BS.append (BSC.pack $ '(' : show xfull ++ "," ++ show yfull) btt
+        bbFrag' = BS.append bh $ BS.append (BSC.pack $ '(' : show xsize ++ "," ++ show ysize) btt
     --BSC.putStrLn bbFrag'
     bbShad <- makeByteStringShaderUsingVAO "bloomBlur" [(vert,bbVert),(frag,bbFrag')] ETriangleStrip
                 (_fullscreenShader rdata)