GUI RTG

RTG Panel

This panel configures the RTG (Retargetable Graphics) card emulation, which provides high-resolution and high-color display modes beyond the native Amiga chipset capabilities. RTG is compatible with Picasso96 and CyberGraphX graphics software.

RTG Graphics Card

Board selector

• Selects the RTG graphics card to emulate.
• Select - to disable RTG.
• Available boards include UAE software RTG (Zorro II and Zorro III) and emulated hardware cards.

Monitor

• Assigns this RTG board to a logical Amiga monitor (Monitor 1 through Monitor 4).
• This is preparation for future multi-window support where each monitor would be a separate emulator window.
• Currently all monitors share the same window; this setting is saved for forward compatibility.
• Saved as gfxboard[N].monitor in the configuration file.

Override initial native chipset display

• When enabled, the RTG display is active at startup instead of the native Amiga chipset display.
• Only available when a board with memory is configured.

VRAM size

• Sets the amount of video memory on the emulated RTG card.
• Available range depends on the selected board:
  • UAE Zorro II: 1MB to 8MB
  • UAE Zorro III / PCI: 1MB to 256MB
  • Hardware boards: limited to the board's hardware minimum and maximum

Color modes

These options are only available for UAE software RTG boards (not hardware boards).

8-bit

• Selects the 8-bit color mode.
• Options: 8-bit (disabled), All, CLUT (*) (Color LookUp Table, palette-based)

15/16-bit

• Selects the 15/16-bit color format.
• Options: 15/16-bit (disabled), All, R5G6B5PC (*), R5G5B5PC, R5G6B5, R5G5B5, B5G6R5PC, B5G5R5PC
• R=Red, G=Green, B=Blue, PC=PC byte order. The (*) marks the default recommended format.

24-bit

• Selects the 24-bit true color format.
• Options: 24-bit (disabled), All, R8G8B8, B8G8R8

32-bit

• Selects the 32-bit color format with alpha channel.
• Options: 32-bit (disabled), All, A8R8G8B8, A8B8G8R8, R8G8B8A8 (*), B8G8R8A8
• A=Alpha channel for transparency.

Display and scaling options

Scale if smaller than display size

• Automatically scales the RTG output up when the RTG resolution is smaller than the display window.

Always scale in windowed mode

• Scales the RTG output even when running in a window.

Always center

• Centers the RTG display on screen without scaling.

Integer scaling

• Scales the display by whole number multiples only (2x, 3x, etc.) for sharp, pixel-perfect output.

Zero Copy (Buffer sharing)

• Shares display buffers directly between the emulation and the renderer for improved performance.

Native/RTG autoswitch

• Automatically switches between the native Amiga chipset display and the RTG display as applications change modes.

Multithreaded

• Uses multiple CPU threads for RTG rendering. Improves performance on multi-core systems.
• Only available for UAE software RTG boards.

Hardware sprite emulation

• Uses the RTG card's hardware sprite engine to render the mouse pointer.
• Only available for UAE software RTG boards.

Hardware vertical blank interrupt

• Emulates a hardware VBlank interrupt for RTG display timing.
• Only available for UAE software RTG boards.

Screen Mode settings

Display

• Selects which physical host display the RTG output appears on. Only shown when two or more displays are connected.
• This is independent of the native display selector in the Display panel.
• When set to a different display than the native output, the emulator window moves between displays as Native/RTG autoswitch toggles between modes.
• Saved as gfx_display_rtg in the configuration file.

Refresh rate

• Sets the RTG display refresh rate.
• Options: Chipset (uses native Amiga timing), Default, 50, 60, 70, 75 Hz

Buffer mode

• Sets the number of display buffers used.
• Options:
  • Double buffering — Two buffers (standard)
  • Triple buffering — Three buffers, reduces screen tearing at the cost of more VRAM

Aspect ratio

• Controls aspect ratio correction when scaling the RTG display.
• Options:
  • Disabled — No aspect ratio correction
  • Automatic — Corrects aspect ratio for square pixels