Added autodetection for X07 bankswitching scheme.

Added OpenGL info to the TV effect tab of the VideoDialog, so users
can see why the effects aren't available if OpenGL is not sufficient.


git-svn-id: svn://svn.code.sf.net/p/stella/code/trunk@1772 8b62c5a3-ac7e-4cc8-8f21-d9a121418aba

src/emucore/Cart.cxx

@@ -321,6 +321,8 @@ string Cartridge::autodetectType(const uInt8* image, uInt32 size)
       if(isProbablySC(image, size))
         type = "EFSC";
     }
+    else if(isProbablyX07(image, size))
+      type = "X07";
     else
       type = "MB";
   }
@@ -583,6 +585,23 @@ bool Cartridge::isProbablyFE(const uInt8* image, uInt32 size)
   return false;
 }
 
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+bool Cartridge::isProbablyX07(const uInt8* image, uInt32 size)
+{
+  // X07 bankswitching switches to bank 0, 1, 2, etc by accessing address 0x08xd
+  uInt8 signature[3][3] = {
+    { 0xAD, 0x0D, 0x08 },  // LDA $080D
+    { 0xAD, 0x1D, 0x08 },  // LDA $081D
+    { 0xAD, 0x2D, 0x08 }   // LDA $082D
+  };
+  for(uInt32 i = 0; i < 3; ++i)
+  {
+    if(searchForBytes(image, size, signature[i], 3, 1))
+      return true;
+  }
+  return false;
+}
+
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 Cartridge::Cartridge(const Cartridge&)
 {

src/emucore/Cart.hxx

@@ -254,6 +254,11 @@ class Cartridge : public Device
     */
     static bool isProbablyFE(const uInt8* image, uInt32 size);
 
+    /**
+      Returns true if the image is probably an X07 bankswitching cartridge
+    */
+    static bool isProbablyX07(const uInt8* image, uInt32 size);
+
   protected:
     // If myBankLocked is true, ignore attempts at bankswitching. This is used
     // by the debugger, when disassembling/dumping ROM.

src/gui/VideoDialog.cxx

@@ -275,6 +275,7 @@ VideoDialog::VideoDialog(OSystem* osystem, DialogContainer* parent,
   wid.push_back(myPhosphorCheckbox);
   ypos += lineHeight + 4;
 
+  // OpenGL information
   // Add message concerning GLSL requirement
   ypos += lineHeight + 4;
   lwidth = font.getStringWidth("(*) TV effects require OpenGL 2.0+ & GLSL");
@@ -285,6 +286,15 @@ VideoDialog::VideoDialog(OSystem* osystem, DialogContainer* parent,
   new StaticTextWidget(myTab, font, 10+font.getStringWidth("(*) "), ypos,
                        lwidth, fontHeight, "\'gl_texrect\' must be disabled",
                        kTextAlignLeft);
+  ypos += lineHeight + 10;
+
+  myGLVersionInfo =
+    new StaticTextWidget(myTab, font, 10+font.getStringWidth("(*) "), ypos,
+                         lwidth, fontHeight, "", kTextAlignLeft);
+  ypos += lineHeight + 4;
+  myGLTexRectInfo =
+    new StaticTextWidget(myTab, font, 10+font.getStringWidth("(*) "), ypos,
+                         lwidth, fontHeight, "", kTextAlignLeft);
 
   // Add items for tab 2
   addToFocusList(wid, tabID);
@@ -427,6 +437,16 @@ void VideoDialog::loadConfig()
   // TV phosphor burn-off effect
   myPhosphorCheckbox->setState(instance().settings().getBool("tv_phos"));
   myPhosphorCheckbox->setEnabled(tv);
+
+  char buf[30];
+  if(gl) sprintf(buf, "OpenGL version detected: %3.1f", FrameBufferGL::glVersion());
+  else   sprintf(buf, "OpenGL version detected: None");
+  myGLVersionInfo->setLabel(buf);
+  sprintf(buf, "OpenGL texrect enabled: %s",
+          instance().settings().getBool("gl_texrect") ? "Yes" : "No");
+  myGLTexRectInfo->setLabel(buf);
+#else
+  myGLVersionInfo->setLabel("OpenGL mode not supported");
 #endif
 
   myTab->loadConfig();

src/gui/VideoDialog.hxx

@@ -81,6 +81,9 @@ class VideoDialog : public Dialog
     PopUpWidget*      myNoisePopup;
     CheckboxWidget*   myPhosphorCheckbox;
 
+    StaticTextWidget* myGLVersionInfo;
+    StaticTextWidget* myGLTexRectInfo;
+
     enum {
       kNAspectRatioChanged = 'VDan',
       kPAspectRatioChanged = 'VDap',