Add scissor test when creating lightmap

src/Render.hs

@@ -5,6 +5,8 @@ module Render (
     bindFBO,
 ) where
 
+import Dodge.Base.Coordinate
+import Dodge.Data.Camera
 import Control.Lens
 import Control.Monad.Primitive
 import Data.Preload.Render
@@ -24,6 +26,7 @@ import Shader.Data
  away" from the shape colors.
 -}
 createLightMap ::
+    Camera ->
     Config ->
     -- | number of walls
     GLsizei ->
@@ -38,10 +41,10 @@ createLightMap ::
     [(Point3, Float, Point3)] -> -- Lights
     RenderData ->
     IO ()
-createLightMap cfig = case shadrendertype of
+createLightMap cam cfig = case shadrendertype of
     NoShadows -> const . const . const renderLightingNoShadows
     NoLighting -> const . const . const . const . const . const renderFlatLighting
-    _ -> renderShadows shadrendertype
+    _ -> renderShadows cam cfig shadrendertype
   where
     shadrendertype = cfig ^. gr_shadow_rendering
 
@@ -114,6 +117,8 @@ renderFlatLighting pdata = do
     glStencilOp GL_KEEP GL_KEEP GL_KEEP
 
 renderShadows ::
+    Camera ->
+    Config ->
     ShadowRendering ->
     GLsizei ->
     Int ->
@@ -123,7 +128,7 @@ renderShadows ::
     [(Point3, Float, Point3)] ->
     RenderData ->
     IO ()
-renderShadows shadrendertype nWalls nSils nCaps positiontexture normaltexture lightPoints pdata = do
+renderShadows cam cfig shadrendertype nWalls nSils nCaps positiontexture normaltexture lightPoints pdata = do
     glBindFramebuffer GL_FRAMEBUFFER $ pdata ^. fboLighting . _1 . unFBO
     let llinesShad = _lightingLineShadowShader pdata
         lcapShad = _lightingCapShader pdata
@@ -150,12 +155,14 @@ renderShadows shadrendertype nWalls nSils nCaps positiontexture normaltexture li
     -- 1. stencil out the shadows from this light's point of view
     -- 2. calculate lighting based on each fragment's position and normal
     -- TODO stencil out square around light!
---    glEnable GL_SCISSOR_TEST
+    glEnable GL_SCISSOR_TEST
     glDisable GL_CULL_FACE
     flip VFSM.mapM_ (VFSM.fromList lightPoints) $ \(V3 x y z, rad, V3 r g b) -> do
         withArray [x,y,z,1,r,g,b,rad] $ glNamedBufferSubData (pdata ^. lightUBO) 0 32
         -- note that the stencil shadows rely on the depth buffer
---        glScissor 0 0 200 200
+        let d = rad * cam ^. camZoom
+            V2 x' y' = worldPosToResOffset cfig cam (V2 x y) 
+        glScissor (round (x'-d)) (round (y'-d)) (round $ 2 *d) (round $ 2* d)
         glDepthFunc GL_LESS
         glColorMask GL_FALSE GL_FALSE GL_FALSE GL_FALSE
         -- setup stencil
@@ -187,8 +194,7 @@ renderShadows shadrendertype nWalls nSils nCaps positiontexture normaltexture li
         glUseProgram ltextShad
         glDrawArrays GL_TRIANGLES 0 6
     --cleanup: may not be necessary, depending on what comes after...
---    glDisable GL_STENCIL_TEST
---    glDisable GL_SCISSOR_TEST
+    glDisable GL_SCISSOR_TEST
     glStencilFunc GL_NOTEQUAL 128 255
     glStencilOp GL_KEEP GL_KEEP GL_KEEP
     glColorMask GL_TRUE GL_TRUE GL_TRUE GL_TRUE