src/add-ons/accelerants/3dfx/3dfx_cursor.cpp

   1 /*
   2         Copyright 2010 Haiku, Inc.  All rights reserved.
   3         Distributed under the terms of the MIT license.
   4
   5         Authors:
   6         Gerald Zajac 2010
   7 */
   8
   9
  10 #include "accelerant.h"
  11 #include "3dfx.h"
  12
  13 #include <string.h>
  14
  15
  16
  17 void
  18 TDFX_ShowCursor(bool bShow)
  19 {
  20         // Turn cursor on/off.
  21
  22         uint32 config = INREG32(VIDEO_PROC_CONFIG);
  23         if (bShow)
  24                 config |= CURSOR_ENABLE;
  25         else
  26                 config &= ~CURSOR_ENABLE;
  27
  28         TDFX_WaitForFifo(1);
  29         OUTREG32(VIDEO_PROC_CONFIG, config);
  30 }
  31
  32
  33 void
  34 TDFX_SetCursorPosition(int x, int y)
  35 {
  36         TDFX_WaitForFifo(1);
  37         OUTREG32(HW_CURSOR_LOC, ((y + 63) << 16) | (x + 63));
  38 }
  39
  40
  41 bool
  42 TDFX_LoadCursorImage(int width, int height, uint8* andMask, uint8* xorMask)
  43 {
  44         SharedInfo& si = *gInfo.sharedInfo;
  45
  46         if (andMask == NULL || xorMask == NULL)
  47                 return false;
  48
  49         uint64* fbCursor64 = (uint64*)((addr_t)si.videoMemAddr + si.cursorOffset);
  50
  51         // Initialize the hardware cursor as completely transparent.
  52
  53         for (int i = 0; i < CURSOR_BYTES; i += 16) {
  54                 *fbCursor64++ = ~0;             // and bits
  55                 *fbCursor64++ = 0;              // xor bits
  56         }
  57
  58         // Now load the AND & XOR masks for the cursor image into the cursor
  59         // buffer.  Note that a particular bit in these masks will have the
  60         // following effect upon the corresponding cursor pixel:
  61         //      AND  XOR        Result
  62         //       0    0          White pixel
  63         //       0    1          Black pixel
  64         //       1    0          Screen color (for transparency)
  65         //       1    1          Reverse screen color to black or white
  66
  67         uint8* fbCursor = (uint8*)((addr_t)si.videoMemAddr + si.cursorOffset);
  68
  69         for (int row = 0; row < height; row++) {
  70                 for (int colByte = 0; colByte < width / 8; colByte++) {
  71                         fbCursor[row * 16 + colByte] = *andMask++;
  72                         fbCursor[row * 16 + colByte + 8] = *xorMask++;
  73                 }
  74         }
  75
  76         // Set the cursor colors which are white background and black foreground.
  77
  78         TDFX_WaitForFifo(2);
  79         OUTREG32(HW_CURSOR_COLOR0, 0xffffff);
  80         OUTREG32(HW_CURSOR_COLOR1, 0);
  81
  82         return true;
  83 }