From 0df32dbeba27645191bf3161bcea7e320450894c Mon Sep 17 00:00:00 2001
From: Jorj Bauer <jorj@jorj.org>
Date: Sat, 9 Jan 2021 12:15:12 -0500
Subject: [PATCH] improve BIOS about screen

---
 bios.cpp                  | 76 ++++++++++++++++++++++++++++++++++++++-
 globals.h                 |  3 +-
 sdl/sdl-display.cpp       |  4 +++
 teensy/teensy-display.cpp |  4 +++
 4 files changed, 85 insertions(+), 2 deletions(-)

diff --git a/bios.cpp b/bios.cpp
index 181f39f..84735be 100644
--- a/bios.cpp
+++ b/bios.cpp
@@ -527,6 +527,13 @@ uint16_t BIOS::AboutScreenHandler(bool needsRedraw, bool performAction)
   if (needsRedraw || localRedraw) {
     g_display->clrScr(c_darkblue);
 
+    // Draw a black area where we're going to "boot" a fake //e for the about screen. Don't put the whole graphic around it so it's obvious it's not a //e.
+    for (uint8_t y=12; y<12+192; y++) {
+      for (uint16_t x=20; x<280+20; x++) {
+	g_display->drawUIPixel( x, y, 0x0000 );
+      }
+    }
+    /*
     g_display->drawString(M_SELECTED,
 			  0,
 			  0,
@@ -544,13 +551,80 @@ uint16_t BIOS::AboutScreenHandler(bool needsRedraw, bool performAction)
 			  0,
 			  200,
 			  "Press return");
-    
+    */
     g_display->flush();
 
     localRedraw = false;
   }
 
+  const char *str =
+    "                                   "
+    "               Aiie!               "
+    "                                   "
+    "                                   "
+    "                                   "
+    "                                   "
+    "                                   "
+    "                                   "
+    "  ... an Apple //e emulator        "
+    "      written by                   "
+    "        Jorj Bauer <jorj@jorj.org> "
+    "                                   "
+    "                                   "
+    "                                   "
+    "  (c) 2017-2021 Jorj Bauer         "
+    "                                   "
+    "                                   "
+    " Source code is available at       "
+    "        github.com/JorjBauer/aiie/ "
+    "                                   "
+    "                                   "
+    "                                   "
+    " Press <Return>... " // intentionally short so cursor stays here
+    ;
+
+  static uint16_t ptr = 0;
+  static bool didFinish = false;
+
+  if (!didFinish) {
+    // Draw the next character
+    bool didOne = false;
+    while (!didOne || ptr < 35*2) { // draw the first 2 lines in one go, no matter what
+      char charToDraw = str[ptr];
+      didOne = true;
+      int xpos = ptr % 35;
+      int ypos = (int)(ptr / 35);
+      if (charToDraw != ' ') {
+	// First 2 lines have a blue background on any text; others are black
+	g_display->drawCharacter(ptr < 70 ? M_NORMAL : M_PLAIN, xpos * 8 + 20, ypos * 8 + 12, charToDraw);
+      }
+      ptr++;
+      if (ptr >= strlen(str)) {
+	didFinish = true;
+      } else {
+	if (charToDraw == ' ') {
+	  // Just blep the spaces to the screen toot-sweet
+	  didOne = false;
+	}
+      }
+    }
+  } else {
+    // Flash the cursor until the user exits
+    static bool cursorOn = false;
+    static bool flopTime = false;
+    flopTime = !flopTime;
+    if (flopTime) {
+      cursorOn = !cursorOn;
+    }
+    int xpos = strlen(str) % 35;
+    int ypos = (int)(strlen(str) / 35);
+    g_display->drawCharacter(M_PLAIN, xpos * 8 + 20, ypos * 8 + 12, cursorOn ? 127 : 32);
+  }
+  g_display->flush();
+  
   if (performAction) {
+    ptr = 0;
+    didFinish = false;
     return BIOS_AIIE;
   }
 
diff --git a/globals.h b/globals.h
index e995cc2..d8fda9a 100644
--- a/globals.h
+++ b/globals.h
@@ -19,7 +19,8 @@ enum {
   M_NORMAL = 0,
   M_SELECTED = 1,
   M_DISABLED = 2,
-  M_SELECTDISABLED = 3
+  M_SELECTDISABLED = 3,
+  M_PLAIN = 4
 };
 
 // debug modes
diff --git a/sdl/sdl-display.cpp b/sdl/sdl-display.cpp
index 3ffbce3..0132751 100644
--- a/sdl/sdl-display.cpp
+++ b/sdl/sdl-display.cpp
@@ -200,6 +200,10 @@ void SDLDisplay::drawCharacter(uint8_t mode, uint16_t x, uint8_t y, char c)
     onPixel = 0x7BEF;
     offPixel = 0xFFE0;
     break;
+  case M_PLAIN:
+    onPixel = 0xFFFF;
+    offPixel = 0x0000;
+    break;
   }
 
 
diff --git a/teensy/teensy-display.cpp b/teensy/teensy-display.cpp
index 4f1152f..3d38079 100644
--- a/teensy/teensy-display.cpp
+++ b/teensy/teensy-display.cpp
@@ -225,6 +225,10 @@ void TeensyDisplay::drawCharacter(uint8_t mode, uint16_t x, uint8_t y, char c)
     onPixel = 0x7BEF;
     offPixel = 0xFFE0;
     break;
+  case M_PLAIN:
+    onPixel = 0xFFFF;
+    offPixel = 0x0000;
+    break;
   }
 
   // This does not scale when drawing, because drawPixel scales.