/*
        Copyright 2010 Haiku, Inc.  All rights reserved.
        Distributed under the terms of the MIT license.

        Authors:
        Gerald Zajac 2010
*/


#include "accelerant.h"
#include "3dfx.h"

#include <string.h>



void
TDFX_ShowCursor(bool bShow)
{
        // Turn cursor on/off.

        uint32 config = INREG32(VIDEO_PROC_CONFIG);
        if (bShow)
                config |= CURSOR_ENABLE;
        else
                config &= ~CURSOR_ENABLE;

        TDFX_WaitForFifo(1);
        OUTREG32(VIDEO_PROC_CONFIG, config);
}


void
TDFX_SetCursorPosition(int x, int y)
{
        TDFX_WaitForFifo(1);
        OUTREG32(HW_CURSOR_LOC, ((y + 63) << 16) | (x + 63));
}


bool
TDFX_LoadCursorImage(int width, int height, uint8* andMask, uint8* xorMask)
{
        SharedInfo& si = *gInfo.sharedInfo;

        if (andMask == NULL || xorMask == NULL)
                return false;

        uint64* fbCursor64 = (uint64*)((addr_t)si.videoMemAddr + si.cursorOffset);

        // Initialize the hardware cursor as completely transparent.

        for (int i = 0; i < CURSOR_BYTES; i += 16) {
                *fbCursor64++ = ~0;             // and bits
                *fbCursor64++ = 0;              // xor bits
        }

        // Now load the AND & XOR masks for the cursor image into the cursor
        // buffer.  Note that a particular bit in these masks will have the
        // following effect upon the corresponding cursor pixel:
        //      AND  XOR        Result
        //       0    0          White pixel
        //       0    1          Black pixel
        //       1    0          Screen color (for transparency)
        //       1    1          Reverse screen color to black or white

        uint8* fbCursor = (uint8*)((addr_t)si.videoMemAddr + si.cursorOffset);

        for (int row = 0; row < height; row++) {
                for (int colByte = 0; colByte < width / 8; colByte++) {
                        fbCursor[row * 16 + colByte] = *andMask++;
                        fbCursor[row * 16 + colByte + 8] = *xorMask++;
                }
        }

        // Set the cursor colors which are white background and black foreground.

        TDFX_WaitForFifo(2);
        OUTREG32(HW_CURSOR_COLOR0, 0xffffff);
        OUTREG32(HW_CURSOR_COLOR1, 0);

        return true;
}