screen.c

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/*
 * PROJECT:         ReactOS VGA display driver
 * LICENSE:         GPL - See COPYING in the top level directory
 * FILE:            win32ss/drivers/displays/vga/objects/screen.c
 * PURPOSE:         
 * PROGRAMMERS:     
 */

#include <vgaddi.h>

static WORD PaletteBuffer[] = {
    16, 0, // 16 entries, start with 0
    0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
};

static BYTE ColorBuffer[] = {
    16, // 16 entries
    0, 0,
    0,  // start with 0
    0x00, 0x00, 0x00, 0x00, // black
    0x2A, 0x00, 0x15, 0x00, // red
    0x00, 0x2A, 0x15, 0x00, // green
    0x2A, 0x2A, 0x15, 0x00, // brown
    0x00, 0x00, 0x2A, 0x00, // blue
    0x2A, 0x15, 0x2A, 0x00, // magenta
    0x15, 0x2A, 0x2A, 0x00, // cyan
    0x21, 0x22, 0x23, 0x00, // dark gray
    0x30, 0x31, 0x32, 0x00, // light gray
    0x3F, 0x00, 0x00, 0x00, // bright red
    0x00, 0x3F, 0x00, 0x00, // bright green
    0x3F, 0x3F, 0x00, 0x00, // bright yellow
    0x00, 0x00, 0x3F, 0x00, // bright blue
    0x3F, 0x00, 0x3F, 0x00, // bright magenta
    0x00, 0x3F, 0x3F, 0x00, // bright cyan
    0x3F, 0x3F, 0x3F, 0x00  // bright white
};

DWORD getAvailableModes(
    IN HANDLE Driver,
    OUT PVIDEO_MODE_INFORMATION *modeInformation,
    OUT DWORD *ModeSize)
{
    ULONG Temp;
    VIDEO_NUM_MODES modes;
    PVIDEO_MODE_INFORMATION VideoTemp;

    /* get number of modes supported */
    if (EngDeviceIoControl(Driver,
                           IOCTL_VIDEO_QUERY_NUM_AVAIL_MODES,
                           NULL,
                           0,
                           &modes,
                           sizeof(VIDEO_NUM_MODES),
                           &Temp))
    {
        /* get modes failed */
        return 0;
    }

    *ModeSize = modes.ModeInformationLength;

    /* allocate buffer for the mini-port to write the modes in */
    *modeInformation = (PVIDEO_MODE_INFORMATION)
                        EngAllocMem(0, modes.NumModes *
                                    modes.ModeInformationLength, ALLOC_TAG);

    if (*modeInformation == NULL)
    {
        /* couldn't allocate buffer */
        return 0;
    }

    /* Ask the mini-port to fill in the available modes. */
    if (EngDeviceIoControl(Driver,
                           IOCTL_VIDEO_QUERY_AVAIL_MODES,
                           NULL,
                           0,
                           *modeInformation,
                           modes.NumModes * modes.ModeInformationLength,
                           &Temp))
    {
        /* failed to query modes */
        EngFreeMem(*modeInformation);
        *modeInformation = NULL;

        return 0;
    }

    /* Which modes supported by miniport driver are also suppoted by us, the
     * display driver */

    Temp = modes.NumModes;
    VideoTemp = *modeInformation;

    /* Reject mode if it's not 4 planes or not graphic or not 1 bits per pel */
    while (Temp--)
    {
        if ((VideoTemp->NumberOfPlanes != 4 ) ||
            !(VideoTemp->AttributeFlags & VIDEO_MODE_GRAPHICS) ||
            (VideoTemp->BitsPerPlane != 1) ||
            BROKEN_RASTERS(VideoTemp->ScreenStride, VideoTemp->VisScreenHeight))
        {
            VideoTemp->Length = 0;
        }

        VideoTemp = (PVIDEO_MODE_INFORMATION)(((PUCHAR)VideoTemp) + modes.ModeInformationLength);
    }

    return modes.NumModes;
}

BOOL DeinitVGA(PPDEV ppdev)
{
    VIDEO_MEMORY VideoMemory;
    ULONG ReturnedDataLength;

    VideoMemory.RequestedVirtualAddress = (PVOID)ppdev->fbScreen;

    if (EngDeviceIoControl(ppdev->KMDriver,
                           IOCTL_VIDEO_UNMAP_VIDEO_MEMORY,
                           (PVOID)&VideoMemory,
                           sizeof(VIDEO_MEMORY),
                           NULL,
                           0,
                           &ReturnedDataLength))
    {
        DPRINT1("Failed to unmap video memory.\n");
        EngDebugBreak();
        return FALSE;
    }
    return TRUE;
}

BOOL InitVGA(PPDEV ppdev, BOOL bFirst)
{
    ULONG ReturnedDataLength;
    VIDEO_MEMORY VideoMemory;
    VIDEO_MEMORY_INFORMATION VideoMemoryInfo;

    ppdev->sizeSurf.cx = 640;
    ppdev->sizeSurf.cy = 480;
    ppdev->ModeNum = 12;

    /* Set the mode that was requested */
    if (EngDeviceIoControl(ppdev->KMDriver,
                           IOCTL_VIDEO_SET_CURRENT_MODE,
                           &ppdev->ModeNum,
                           sizeof(VIDEO_MODE),
                           NULL,
                           0,
                           &ReturnedDataLength))
    {
        return FALSE;
    }

    /* set up internal palette */
    if (EngDeviceIoControl(ppdev->KMDriver,
                           IOCTL_VIDEO_SET_PALETTE_REGISTERS,
                           (PVOID) PaletteBuffer,
                           sizeof (PaletteBuffer),
                           NULL,
                           0,
                           &ReturnedDataLength))
    {
       return FALSE;
    }

    /* set up the DAC */
    if (EngDeviceIoControl(ppdev->KMDriver,
                           IOCTL_VIDEO_SET_COLOR_REGISTERS,
                           (PVOID) ColorBuffer,
                           sizeof (ColorBuffer),
                           NULL,
                           0,
                           &ReturnedDataLength))
    {
        return FALSE;
    }

    if (bFirst)
    {
        /* map video memory into virtual memory */
        VideoMemory.RequestedVirtualAddress = NULL;

        if (EngDeviceIoControl(ppdev->KMDriver,
                               IOCTL_VIDEO_MAP_VIDEO_MEMORY,
                               (PVOID) &VideoMemory,
                               sizeof (VIDEO_MEMORY),
                               (PVOID) &VideoMemoryInfo,
                               sizeof (VideoMemoryInfo),
                               &ReturnedDataLength))
        {
            /* Failed to map to virtual memory */
            return FALSE;
        }

        ppdev->fbScreen = VideoMemoryInfo.FrameBufferBase;
        vidmem = (PUCHAR)ppdev->fbScreen;
    }

    return TRUE;
}