some random stuffs?

src/net/torvald/terrarum/modulecomputers/virtualcomputer/computer/BLIT.kt

@@ -0,0 +1,87 @@
+package net.torvald.terrarum.modulecomputers.virtualcomputer.computer
+
+import net.torvald.UnsafeHelper
+import net.torvald.UnsafePtr
+import net.torvald.terrarum.AppLoader
+import net.torvald.terrarum.CommonResourcePool
+
+/**
+ * Blit is a display adapter that operates in pixel-space, with resolution of 224x320 with bit depth of one.
+ *
+ * This Blit is inspired by the real-world Blit terminal from 1982 by Bell Labs.
+ *
+ * @link https://en.wikipedia.org/wiki/Blit_(computer_terminal)
+ *
+ * Created by minjaesong on 2019-07-22.
+ */
+class BLIT {
+
+    private val framebuffer = UnsafeHelper.allocate(W.toLong() * H)
+
+    var scrollOffsetX = 0
+    var scrollOffsetY = 0
+    var textCursorPos = 0
+
+    // each pixel is a byte. I know, 7 bits wasted, but whatever.
+
+    // any conversion to texture/GDX pixmap/etc must be done by other system.
+    // at least you can memcpy() them using UnsafeHelper
+    // TODO test memcpy() over pixmap and native memory
+
+    private fun toAddr(x: Int, y: Int) = (W * y + x) % framebuffer.size
+
+    fun drawPict(x: Int, y: Int, bytes: ByteArray, width: Int) {
+        for (yy in 0L until bytes.size / width) {
+            val writeAddr = toAddr(x, y)
+
+            UnsafeHelper.memcpyRaw(
+                    bytes, (if (AppLoader.is32BitJVM) 8 else 16) + yy * width,
+                    null, framebuffer.ptr + writeAddr,
+                    width.toLong()
+            )
+        }
+    }
+
+    fun drawLetter(px: Int, py: Int, char: Int) {
+        for (yy in 0L until 13L) {
+            UnsafeHelper.memcpy(
+                    fontRom.ptr + (FONTROMW * (char / FONTROMCOLS) * FONTH * yy) + (char % FONTROMCOLS) * FONTW,
+                    toAddr(px, py),
+                    FONTW.toLong()
+            )
+        }
+    }
+
+
+    /**
+     * Notes:
+     *
+     * - The font ROM will not be redefine-able. Just draw your shape on the pixel space.
+     */
+    companion object {
+        const val W = 240
+        const val H = 320
+
+        const val FONTW = 6
+        const val FONTH = 10
+
+        const val FONTROMW = 192
+        const val FONTROMH = 80
+
+        const val FONTROMCOLS = FONTROMW / FONTW
+        const val FONTROMROWS = FONTROMH / FONTH
+
+        const val TEXT_OFFSET_X = 0 // hand-calculated value
+        const val TEXT_OFFSET_Y = 4 // hand-calculated value
+        // so, y=0..3 and y=317..320 won't be touched by the text drawing
+
+        init {
+            // load common font rom
+            CommonResourcePool.addToLoadingList("dwarventech.computers.blit.fontrom") {
+                // TODO
+            }
+        }
+
+        private val fontRom = CommonResourcePool.getAs<UnsafePtr>("dwarventech.computers.blit.fontrom")
+    }
+}