See Github issue #15

assets/mods/basegame/blocks/Terrain - Air tile must have black transparent tile, NOT white.txt

@@ -1 +1,3 @@
-Air tile (tile 0,0) must have colour of 0x00000000, NOT 0xFFFFFF00. You can modify the tga file directly to correct bad exporter behaviour.
+Air tile (tile 0,0) must have colour of 0x00000000, NOT 0xFFFFFF00. You can modify the tga file directly to correct bad exporter behaviour.
+
+All TGA must have alpha premultiplied.

assets/mods/basegame/blocks/blocks.csv

@@ -1,5 +1,6 @@
   "id";"drop";"name"                        ;  "shdr";  "shdg";  "shdb"; "shduv";"str";"dsty";"mate";"solid";"plat";"clear";"wall";"fall";"dlfn";"vscs";"fv";"fr";  "lumr";  "lumg";  "lumb"; "lumuv"
    "0";   "0";"BLOCK_AIR"                   ;"0.0312";"0.0312";"0.0312";"0.0312";  "1";   "1";"NULL";    "0";   "0";    "1";   "1";   "0";   "0"; "N/A"; "0"; "4";"0.0000";"0.0000";"0.0000";"0.0000"
+   "1";   "1";"BLOCK_MIASMA"                ;"0.0312";"0.0312";"0.0312";"0.0312";  "1";   "1";"NULL";    "0";   "0";    "1";   "1";   "0";   "0"; "N/A"; "0"; "4";"0.0000";"0.0000";"0.0000";"0.0000"
   "16";  "17";"BLOCK_STONE"                 ;"0.1252";"0.1252";"0.1252";"0.1252"; "48";"2400";"ROCK";    "1";   "0";    "0";   "1";   "0";   "0"; "N/A"; "4";"16";"0.0000";"0.0000";"0.0000";"0.0000"
   "17";  "17";"BLOCK_STONE_QUARRIED"        ;"0.1252";"0.1252";"0.1252";"0.1252"; "48";"2400";"ROCK";    "1";   "0";    "0";   "1";   "0";   "0"; "N/A"; "4";"16";"0.0000";"0.0000";"0.0000";"0.0000"
   "18";  "18";"BLOCK_STONE_TILE_WHITE"      ;"0.1252";"0.1252";"0.1252";"0.1252"; "48";"2400";"ROCK";    "1";   "0";    "0";   "1";   "0";   "0"; "N/A"; "4";"16";"0.0000";"0.0000";"0.0000";"0.0000"

src/net/torvald/terrarum/AppLoader.java

@@ -157,7 +157,7 @@ public class AppLoader implements ApplicationListener {
         ShaderProgram.pedantic = false;
 
         LwjglApplicationConfiguration appConfig = new LwjglApplicationConfiguration();
-        appConfig.useGL30 = true;
+        //appConfig.useGL30 = true; // used: loads GL 3.2, unused: loads GL 4.6; what the fuck?
         appConfig.vSyncEnabled = false;
         appConfig.resizable = false;//true;
         //appConfig.width = 1072; // IMAX ratio

src/net/torvald/terrarum/Terrarum.kt

@@ -577,26 +577,25 @@ fun SpriteBatch.drawStraightLine(x: Float, y: Float, otherEnd: Float, thickness:
 infix fun Color.mul(other: Color): Color = this.cpy().mul(other)
 
 
-
-/*inline fun Color.toRGB10(): RGB10 {
-    val bits = this.toIntBits() // ABGR
-    // 0bxxRRRRRRRRRRGGGGGGGGGGBBBBBBBBBB
-    // 0bAAAAAAAABBBBBBBBGGGGGGGGRRRRRRRR
-    return bits.and(0x0000FF).shl(20) or bits.and(0x00FF00).shl(2) or bits.and(0xFF0000).ushr(16)
-}*/
-
-
-
 fun blendMul(batch: SpriteBatch? = null) {
     // will break if the colour image contains semitransparency
     (batch ?: Terrarum.batch).enableBlending()
     (batch ?: Terrarum.batch).setBlendFunction(GL20.GL_DST_COLOR, GL20.GL_ONE_MINUS_SRC_ALPHA)
-    Gdx.gl.glBlendEquation(GL20.GL_FUNC_ADD) // batch.flush does not touch blend equation
+}
+
+fun blendScreen(batch: SpriteBatch? = null) {
+    // will break if the colour image contains semitransparency
+    (batch ?: Terrarum.batch).enableBlending()
+    (batch ?: Terrarum.batch).setBlendFunction(GL20.GL_ONE, GL20.GL_ONE_MINUS_SRC_COLOR)
+}
+
+fun blendDisable(batch: SpriteBatch? = null) {
+    (batch ?: Terrarum.batch).disableBlending()
 }
 
 fun blendNormal(batch: SpriteBatch? = null) {
     (batch ?: Terrarum.batch).enableBlending()
-    (batch ?: Terrarum.batch).setBlendFunction(GL20.GL_SRC_ALPHA, GL20.GL_ONE_MINUS_SRC_ALPHA)
+    (batch ?: Terrarum.batch).setBlendFunctionSeparate(GL20.GL_SRC_ALPHA, GL20.GL_ONE_MINUS_SRC_ALPHA, GL20.GL_SRC_ALPHA, GL20.GL_ONE)
 
     // ALPHA *MUST BE* PREMULTIPLIED //
 
@@ -613,17 +612,6 @@ fun blendNormal(batch: SpriteBatch? = null) {
     // - https://www.andersriggelsen.dk/glblendfunc.php
 }
 
-fun blendScreen(batch: SpriteBatch? = null) {
-    // will break if the colour image contains semitransparency
-    (batch ?: Terrarum.batch).enableBlending()
-    (batch ?: Terrarum.batch).setBlendFunction(GL20.GL_ONE, GL20.GL_ONE_MINUS_SRC_COLOR)
-    Gdx.gl.glBlendEquation(GL20.GL_FUNC_ADD) // batch.flush does not touch blend equation
-}
-
-fun blendDisable(batch: SpriteBatch? = null) {
-    (batch ?: Terrarum.batch).disableBlending()
-}
-
 fun gdxClearAndSetBlend(r: Float, g: Float, b: Float, a: Float) {
     Gdx.gl.glClearColor(r,g,b,a)
     Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT)
@@ -637,8 +625,8 @@ fun gdxSetBlend() {
 
 fun gdxSetBlendNormal() {
     gdxSetBlend()
-    Gdx.gl.glBlendFunc(GL20.GL_SRC_ALPHA, GL20.GL_ONE_MINUS_SRC_ALPHA)
-    Gdx.gl.glBlendEquation(GL20.GL_FUNC_ADD)
+    Gdx.gl.glBlendFuncSeparate(GL20.GL_SRC_ALPHA, GL20.GL_ONE_MINUS_SRC_ALPHA, GL20.GL_SRC_ALPHA, GL20.GL_ONE)
+    //Gdx.gl.glBlendEquationSeparate(GL20.GL_FUNC_ADD, GL30.GL_MAX) // batch.flush does not touch blend equation
 
     // ALPHA *MUST BE* PREMULTIPLIED //
 

src/net/torvald/terrarum/modulebasegame/IngameRenderer.kt

@@ -94,7 +94,7 @@ object IngameRenderer {
 
         // clear main or whatever super-FBO being used
         //clearBuffer()
-        gdxClearAndSetBlend(.64f, .754f, .84f, 1f)
+        gdxClearAndSetBlend(.64f, .754f, .84f, 0f)
 
         ///////////////////////////////////////////////////////////////////////
 
@@ -544,21 +544,21 @@ object IngameRenderer {
             lightmapFboB.dispose()
         }
 
-        fboRGB = FrameBuffer(Pixmap.Format.RGBA8888, width, height, false)
-        fboRGB_lightMixed = FrameBuffer(Pixmap.Format.RGBA8888, width, height, false)
-        fboA = FrameBuffer(Pixmap.Format.RGBA8888, width, height, false)
-        fboA_lightMixed = FrameBuffer(Pixmap.Format.RGBA8888, width, height, false)
+        fboRGB = FrameBuffer(Pixmap.Format.RGBA8888, width, height, true)
+        fboRGB_lightMixed = FrameBuffer(Pixmap.Format.RGBA8888, width, height, true)
+        fboA = FrameBuffer(Pixmap.Format.RGBA8888, width, height, true)
+        fboA_lightMixed = FrameBuffer(Pixmap.Format.RGBA8888, width, height, true)
         lightmapFboA = FrameBuffer(
                 Pixmap.Format.RGBA8888,
                 LightmapRenderer.lightBuffer.width * LightmapRenderer.DRAW_TILE_SIZE.toInt(),
                 LightmapRenderer.lightBuffer.height * LightmapRenderer.DRAW_TILE_SIZE.toInt(),
-                false
+                true
         )
         lightmapFboB = FrameBuffer(
                 Pixmap.Format.RGBA8888,
                 LightmapRenderer.lightBuffer.width * LightmapRenderer.DRAW_TILE_SIZE.toInt(),
                 LightmapRenderer.lightBuffer.height * LightmapRenderer.DRAW_TILE_SIZE.toInt(),
-                false
+                true
         )
 
         BlocksDrawer.resize(width, height)

src/net/torvald/terrarum/worlddrawer/LightmapRendererNew.kt

@@ -190,14 +190,15 @@ object LightmapRenderer {
          * Updating order:
          * ,--------.   ,--+-----.   ,-----+--.   ,--------. -
          * |↘       |   |  |    3|   |3    |  |   |       ↙| ↕︎ overscan_open / overscan_opaque
-         * |  +-----+   |  |  2  |   |  2  |  |   +-----+  | - depending on the noop_mask
-         * |  |1    | → |  |1    | → |    1|  | → |    1|  |
-         * |  |  2  |   |  +-----+   +-----+  |   |  2  |  |
+         * |  ,-----+   |  |  2  |   |  2  |  |   +-----.  | - depending on the noop_mask
+         * |  |1    |   |  |1    |   |    1|  |   |    1|  |
+         * |  |  2  |   |  `-----+   +-----'  |   |  2  |  |
          * |  |    3|   |↗       |   |       ↖|   |3    |  |
          * `--+-----'   `--------'   `--------'   `-----+--'
          * round:   1            2            3            4
-         * for all lightmap[y][x], run in this order: 2-3-4-1
-         * for some reason, this setup removes (or mitigates) directional artefacts.
+         * for all lightmap[y][x], run in this order: 2-3-4-1-2
+         *     If you run only 4 sets, orthogonal/diagonal artefacts are bound to occur,
+         * it seems 5-pass is mandatory
          */
 
         AppLoader.debugTimers["Renderer.Lanterns"] = measureNanoTime {
@@ -247,11 +248,21 @@ object LightmapRenderer {
                 }
             }
 
+            // Round 2
+            AppLoader.debugTimers["Renderer.Light5"] = measureNanoTime {
+                for (y in for_y_end + overscan_open downTo for_y_start) {
+                    for (x in for_x_start - overscan_open..for_x_end) {
+                        setLight(x, y, calculate(x, y, 5))
+                    }
+                }
+            }
+
             AppLoader.debugTimers["Renderer.LightSequential"] =
                     (AppLoader.debugTimers["Renderer.Light1"]!! as Long) +
                     (AppLoader.debugTimers["Renderer.Light2"]!! as Long) +
                     (AppLoader.debugTimers["Renderer.Light3"]!! as Long) +
-                    (AppLoader.debugTimers["Renderer.Light4"]!! as Long)
+                    (AppLoader.debugTimers["Renderer.Light4"]!! as Long) +
+                    (AppLoader.debugTimers["Renderer.Light5"]!! as Long)
         }
         else {
             AppLoader.debugTimers["Renderer.LightPre"] = measureNanoTime {