1 files changed, 120 insertions, 0 deletions
diff --git a/src/LcdController.php b/src/LcdController.php
new file mode 100644
index 0000000..5501465
--- /dev/null
+++ b/src/LcdController.php
@@ -0,0 +1,120 @@
+<?php
+
+namespace GameBoy;
+
+class LcdController
+{
+    protected $core;
+
+    public function __construct($core)
+    {
+        $this->core = $core;
+    }
+
+    /**
+     * Scan Line and STAT Mode Control
+     * @param  int $line Memory Scanline
+     */
+    public function scanLine($line)
+    {
+        //When turned off = Do nothing!
+        //@TODO - Move LCDisOn to this class
+        if ($this->core->LCDisOn) {
+            if ($line < 143) {
+                //We're on a normal scan line:
+                if ($this->core->LCDTicks < 20) {
+                    $this->core->scanLineMode2(); // mode2: 80 cycles
+                } elseif ($this->core->LCDTicks < 63) {
+                    $this->core->scanLineMode3(); // mode3: 172 cycles
+                } elseif ($this->core->LCDTicks < 114) {
+                    $this->core->scanLineMode0(); // mode0: 204 cycles
+                } else {
+                    //We're on a new scan line:
+                    $this->core->LCDTicks -= 114;
+                    $this->core->actualScanLine = ++$this->core->memory[0xFF44];
+                    $this->core->matchLYC();
+                    if ($this->core->STATTracker != 2) {
+                        if ($this->core->hdmaRunning && !$this->core->halt && $this->core->LCDisOn) {
+                            $this->core->performHdma(); //H-Blank DMA
+                        }
+                        if ($this->core->mode0TriggerSTAT) {
+                            $this->core->memory[0xFF0F] |= 0x2; // set IF bit 1
+                        }
+                    }
+                    $this->core->STATTracker = 0;
+                    $this->core->scanLineMode2(); // mode2: 80 cycles
+                    if ($this->core->LCDTicks >= 114) {
+                        //We need to skip 1 or more scan lines:
+                        $this->core->notifyScanline();
+                        $this->scanLine($this->core->actualScanLine); //Scan Line and STAT Mode Control
+                    }
+                }
+            } elseif ($line == 143) {
+                //We're on the last visible scan line of the LCD screen:
+                if ($this->core->LCDTicks < 20) {
+                    $this->core->scanLineMode2(); // mode2: 80 cycles
+                } elseif ($this->core->LCDTicks < 63) {
+                    $this->core->scanLineMode3(); // mode3: 172 cycles
+                } elseif ($this->core->LCDTicks < 114) {
+                    $this->core->scanLineMode0(); // mode0: 204 cycles
+                } else {
+                    //Starting V-Blank:
+                    //Just finished the last visible scan line:
+                    $this->core->LCDTicks -= 114;
+                    $this->core->actualScanLine = ++$this->core->memory[0xFF44];
+                    $this->core->matchLYC();
+                    if ($this->core->mode1TriggerSTAT) {
+                        $this->core->memory[0xFF0F] |= 0x2; // set IF bit 1
+                    }
+                    if ($this->core->STATTracker != 2) {
+                        if ($this->core->hdmaRunning && !$this->core->halt && $this->core->LCDisOn) {
+                            $this->core->performHdma(); //H-Blank DMA
+                        }
+                        if ($this->core->mode0TriggerSTAT) {
+                            $this->core->memory[0xFF0F] |= 0x2; // set IF bit 1
+                        }
+                    }
+                    $this->core->STATTracker = 0;
+                    $this->core->modeSTAT = 1;
+                    $this->core->memory[0xFF0F] |= 0x1; // set IF flag 0
+                    //LCD off takes at least 2 frames.
+                    if ($this->core->drewBlank > 0) {
+                        --$this->core->drewBlank;
+                    }
+                    if ($this->core->LCDTicks >= 114) {
+                        //We need to skip 1 or more scan lines:
+                        $this->scanLine($this->core->actualScanLine); //Scan Line and STAT Mode Control
+                    }
+                }
+            } elseif ($line < 153) {
+                //In VBlank
+                if ($this->core->LCDTicks >= 114) {
+                    //We're on a new scan line:
+                    $this->core->LCDTicks -= 114;
+                    $this->core->actualScanLine = ++$this->core->memory[0xFF44];
+                    $this->core->matchLYC();
+                    if ($this->core->LCDTicks >= 114) {
+                        //We need to skip 1 or more scan lines:
+                        $this->scanLine($this->core->actualScanLine); //Scan Line and STAT Mode Control
+                    }
+                }
+            } else {
+                //VBlank Ending (We're on the last actual scan line)
+                if ($this->core->memory[0xFF44] == 153) {
+                    $this->core->memory[0xFF44] = 0; //LY register resets to 0 early.
+                    $this->core->matchLYC(); //LY==LYC Test is early here (Fixes specific one-line glitches (example: Kirby2 intro)).
+                }
+                if ($this->core->LCDTicks >= 114) {
+                    //We reset back to the beginning:
+                    $this->core->LCDTicks -= 114;
+                    $this->core->actualScanLine = 0;
+                    $this->core->scanLineMode2(); // mode2: 80 cycles
+                    if ($this->core->LCDTicks >= 114) {
+                        //We need to skip 1 or more scan lines:
+                        $this->scanLine($this->core->actualScanLine); //Scan Line and STAT Mode Control
+                    }
+                }
+            }
+        }
+    }
+}