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Initial commit of Command & Conquer Red Alert source code.
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LFeenanEA
217
VQ/INCLUDE/VQM32/VGA.I
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217
VQ/INCLUDE/VQM32/VGA.I
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;
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; Command & Conquer Red Alert(tm)
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; Copyright 2025 Electronic Arts Inc.
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;
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; This program is free software: you can redistribute it and/or modify
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; it under the terms of the GNU General Public License as published by
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; the Free Software Foundation, either version 3 of the License, or
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; (at your option) any later version.
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;
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; This program is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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; GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public License
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; along with this program. If not, see <http://www.gnu.org/licenses/>.
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;
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;****************************************************************************
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;*
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;* C O N F I D E N T I A L -- W E S T W O O D S T U D I O S
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;*
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;*---------------------------------------------------------------------------
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;*
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;* FILE
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;* vga.i
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;*
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;* DESCRIPTION
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;* VGA hardware definitions. (32-Bit protected mode)
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;*
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;* PROGRAMMER
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;* Denzil E. Long, Jr.
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;*
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;* DATE
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;* January 26, 1995
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;*
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;****************************************************************************
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;----------------------------------------------------------------------------
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; VGA Registers
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;----------------------------------------------------------------------------
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R_SEQUENCER EQU 03C4h ;Sequencer Controller Index reg
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SEQ_RESET EQU 00h ;Reset
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SEQ_MAP_MASK EQU 02h ;Index in Sequencer of Map Mask reg
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SEQ_MEMORY_MODE EQU 04h ;Memory Mode
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R_GRAPHICS_CONTROLLER EQU 03CEh ;Graphics Controller Index reg
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GC_READ_MAP EQU 04h ;Index in GController of Read Map reg
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GC_MODE EQU 05h ;Read/Write Modes
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GC_MISC EQU 06h ;Read/Write Modes
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GC_BITMASK EQU 08h ;Index in GController of BitMask reg
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R_CRT_CONTROLLER EQU 03D4h ;CRT Controller Index reg
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CRT_VERT_TOTAL EQU 06h ;Vertical total
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CRT_OVERFLOW EQU 07h ;Overflow
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CRT_MAX_SCANLINE EQU 09h ;Max scan line
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CRT_STARTADDR_HIGH EQU 0Ch ;Bitmap start address high byte
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CRT_STARTADDR_LOW EQU 0Dh ;Bitmap start address low byte
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CRT_VERTRET_START EQU 010h ;Vertical retrace pulse start
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CRT_VERTRET_END EQU 011h ;Vertical retrace pulse end
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CRT_VERTDISP_END EQU 012h ;Vertical display end
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CRT_UNDERLINE EQU 014h ;Underline location
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CRT_START_VB EQU 015h ;Start vertical blank
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CRT_END_VB EQU 016h ;End vertical blank
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CRT_MODE_CONTROL EQU 017h ;Mode control
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R_MISC_OUTPUT EQU 03C2h ;Miscellaneous Output reg
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;----------------------------------------------------------------------------
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; Palette Registers
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;----------------------------------------------------------------------------
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PEL_READ_ADDR EQU 03C7h
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PEL_WRITE_ADDR EQU 03C8h
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PEL_DATA EQU 03C9h
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;----------------------------------------------------------------------------
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; XMode planes, for the Map Mask register
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;----------------------------------------------------------------------------
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XPLANE_1 EQU 1
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XPLANE_2 EQU 2
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XPLANE_3 EQU 4
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XPLANE_4 EQU 8
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;----------------------------------------------------------------------------
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;
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; NAME
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; SET_PLANE - Set an XMode plane.
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;
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; SYNOPSIS
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; SET_PLANE plane
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;
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; INPUTS
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; plane - Number of Xmode plane to set.
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;
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; USES
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; eax, edx
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;
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;----------------------------------------------------------------------------
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MACRO SET_PLANE plane
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mov edx,R_SEQUENCER
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mov eax,SEQ_MAP_MASK
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out dx,al
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inc edx
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mov eax,plane
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out dx,al
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ENDM
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;----------------------------------------------------------------------------
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;
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; NAME
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; SET_BITMASK - Set the BitMask register.
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;
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; SYNOPSIS
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; SET_BITMASK mask
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;
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; INPUTS
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; mask - Bitmask to use.
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;
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; USES
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; eax, edx
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;
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;----------------------------------------------------------------------------
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MACRO SET_BITMASK mask
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mov edx,R_GRAPHICS_CONTROLLER
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mov eax,GC_BITMASK
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out dx,al
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inc edx
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mov eax,mask
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out dx,al
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ENDM
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;----------------------------------------------------------------------------
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;
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; NAME
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; SET_WRITEMODE - Set the VGA writemode.
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;
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; SYNOPSIS
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; SET_WRITEMODE mode
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;
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; INPUTS
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; mode - Write mode.
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;
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; USES
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; eax, edx
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;
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;----------------------------------------------------------------------------
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MACRO SET_WRITEMODE mode
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mov edx,R_GRAPHICS_CONTROLLER
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mov eax,GC_MODE
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out dx,al
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inc edx
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in al,dx ;Read the register
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and al,0FCh ;Turn off 2 lower bits
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or al,mode ;Set write mode
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out dx,al
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ENDM
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;----------------------------------------------------------------------------
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;
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; NAME
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; OUTPORT - Output data to a VGA register.
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;
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; SYNOPSIS
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; OUTPORT port,register,data
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;
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; INPUTS
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; port - Port address.
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; register - Register to write to.
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; data - Data to write.
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;
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; USES
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; eax, edx
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;
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;----------------------------------------------------------------------------
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MACRO OUTPORT port,register,data
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mov edx,port
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mov al,register
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out dx,al
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inc edx
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mov al,data
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out dx,al
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ENDM
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;----------------------------------------------------------------------------
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;
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; NAME
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; INPORT - Input data from a VGA register.
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;
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; SYNOPSIS
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; data = INPORT port,register
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;
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; INPUTS
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; port - Port address.
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; register - Register to read from.
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;
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; RESULT
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; data - Value read from port in AL.
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;
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; USES
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; eax, edx
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;
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;----------------------------------------------------------------------------
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MACRO INPORT port,register
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mov edx,port
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mov al,register
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out dx,al
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inc edx
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in al,dx
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ENDM
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