/* -*- mode: C; tab-width:8; c-basic-offset:2 -*- */

/*
 * Mesa 3-D graphics library
 * Version:  3.3
 *
 * Copyright (C) 1999-2000  Brian Paul   All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 *
 * Original Mesa / 3Dfx device driver (C) 1999 David Bucciarelli, by the
 * terms stated above.
 *
 * Thank you for your contribution, David!
 *
 * Please make note of the above copyright/license statement.  If you
 * contributed code or bug fixes to this code under the previous (GNU
 * Library) license and object to the new license, your code will be
 * removed at your request.  Please see the Mesa docs/COPYRIGHT file
 * for more information.
 *
 * Additional Mesa/3Dfx driver developers:
 *   Daryll Strauss <daryll@precisioninsight.com>
 *   Keith Whitwell <keith@precisioninsight.com>
 *
 * See fxapi.h for more revision/author details.
 */


/* fxdd.c - 3Dfx VooDoo Mesa device driver functions */


#ifdef HAVE_CONFIG_H
#include "conf.h"
#endif

#if defined(FX)

#include "image.h"
#include "types.h"
#include "fxdrv.h"
#include "enums.h"
#include "extensions.h"
#include "pb.h"

/* These lookup table are used to extract RGB values in [0,255] from
 * 16-bit pixel values.
 */
GLubyte FX_PixelToR[0x10000];
GLubyte FX_PixelToG[0x10000];
GLubyte FX_PixelToB[0x10000];


/*
 * Initialize the FX_PixelTo{RGB} arrays.
 * Input: bgrOrder - if TRUE, pixels are in BGR order, else RGB order.
 */
void fxInitPixelTables(fxMesaContext fxMesa, GLboolean bgrOrder)
{
  GLuint pixel;

  fxMesa->bgrOrder=bgrOrder;
  for (pixel = 0; pixel <= 0xffff; pixel++) {
    GLuint r, g, b;
    if (bgrOrder) {
      r = (pixel & 0x001F) << 3;
      g = (pixel & 0x07E0) >> 3;
      b = (pixel & 0xF800) >> 8;
    }
    else {
      r = (pixel & 0xF800) >> 8;
      g = (pixel & 0x07E0) >> 3;
      b = (pixel & 0x001F) << 3;
    }
    r = r * 255 / 0xF8;  /* fill in low-order bits */
    g = g * 255 / 0xFC;
    b = b * 255 / 0xF8;
    FX_PixelToR[pixel] = r;
    FX_PixelToG[pixel] = g;
    FX_PixelToB[pixel] = b;
  }
}


/**********************************************************************/
/*****                 Miscellaneous functions                    *****/
/**********************************************************************/

/* Enalbe/Disable dithering */
static void fxDDDither(GLcontext *ctx, GLboolean enable)
{
  if (MESA_VERBOSE&VERBOSE_DRIVER) {
    fprintf(stderr,"fxmesa: fxDDDither()\n");
  }

  if (enable) {
    FX_grDitherMode(GR_DITHER_4x4);
  } else {
    FX_grDitherMode(GR_DITHER_DISABLE);
  }
}


/* Return buffer size information */
static void fxDDBufferSize(GLcontext *ctx, GLuint *width, GLuint *height)
{
  fxMesaContext fxMesa=(fxMesaContext)ctx->DriverCtx;

  if (MESA_VERBOSE&VERBOSE_DRIVER) {
    fprintf(stderr,"fxmesa: fxDDBufferSize(...) Start\n");
  }

  *width=fxMesa->width;
  *height=fxMesa->height;

  if (MESA_VERBOSE&VERBOSE_DRIVER) {
    fprintf(stderr,"fxmesa: fxDDBufferSize(...) End\n");
  }
}


/* Set current drawing color */
static void fxDDSetColor(GLcontext *ctx, GLubyte red, GLubyte green,
                         GLubyte blue, GLubyte alpha )
{
  fxMesaContext fxMesa=(fxMesaContext)ctx->DriverCtx;
  GLubyte col[4];
  ASSIGN_4V( col, red, green, blue, alpha );
  
  if (MESA_VERBOSE&VERBOSE_DRIVER) {
    fprintf(stderr,"fxmesa: fxDDSetColor(%d,%d,%d,%d)\n",red,green,blue,alpha);
  }

  fxMesa->color=FXCOLOR4(col);
}


/* Implements glClearColor() */
static void fxDDClearColor(GLcontext *ctx, GLubyte red, GLubyte green,
                           GLubyte blue, GLubyte alpha )
{
  fxMesaContext fxMesa=(fxMesaContext)ctx->DriverCtx;
  GLubyte col[4];



  ASSIGN_4V( col, red, green, blue, 255 );

  if (MESA_VERBOSE&VERBOSE_DRIVER) {
    fprintf(stderr,"fxmesa: fxDDClearColor(%d,%d,%d,%d)\n",red,green,blue,alpha);
  }
 
  fxMesa->clearC=FXCOLOR4( col );
  fxMesa->clearA=alpha;
}


/* Clear the color and/or depth buffers */
static GLbitfield fxDDClear(GLcontext *ctx, GLbitfield mask, GLboolean all,
                            GLint x, GLint y, GLint width, GLint height )
{
  fxMesaContext fxMesa=(fxMesaContext)ctx->DriverCtx;
  const GLuint colorMask = *((GLuint *) &ctx->Color.ColorMask);
  const FxU16 clearD = (FxU16) (ctx->Depth.Clear * 0xffff);
  GLbitfield softwareMask = mask & (DD_STENCIL_BIT | DD_ACCUM_BIT);

  /* we can't clear stencil or accum buffers */
  mask &= ~(DD_STENCIL_BIT | DD_ACCUM_BIT);

  if (MESA_VERBOSE & VERBOSE_DRIVER) {
    fprintf(stderr,"fxmesa: fxDDClear(%d,%d,%d,%d)\n", (int) x, (int) y,
            (int) width, (int) height);
  }

  if (colorMask != 0xffffffff) {
    /* do masked color buffer clears in software */
    softwareMask |= (mask & (DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT));
    mask &= ~(DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT);
  }

  /*
   * This could probably be done fancier but doing each possible case
   * explicitly is less error prone.
   */
  switch (mask) {
    case DD_BACK_LEFT_BIT | DD_DEPTH_BIT:
      /* back buffer & depth */
      FX_grDepthMask(FXTRUE);
      FX_grRenderBuffer(GR_BUFFER_BACKBUFFER);
      FX_grBufferClear(fxMesa->clearC, fxMesa->clearA, clearD);
      if (!ctx->Depth.Mask) {
        FX_grDepthMask(FXFALSE);
      }
      break;
    case DD_FRONT_LEFT_BIT | DD_DEPTH_BIT:
      /* XXX it appears that the depth buffer isn't cleared when
       * glRenderBuffer(GR_BUFFER_FRONTBUFFER) is set.
       * This is a work-around/
       */
      /* clear depth */
      FX_grDepthMask(FXTRUE);
      FX_grRenderBuffer(GR_BUFFER_BACKBUFFER);
      FX_grColorMask(FXFALSE,FXFALSE);
      FX_grBufferClear(fxMesa->clearC, fxMesa->clearA, clearD);
      /* clear front */
      FX_grColorMask(FXTRUE, ctx->Color.ColorMask[ACOMP] && fxMesa->haveAlphaBuffer);
      FX_grRenderBuffer(GR_BUFFER_FRONTBUFFER);
      FX_grBufferClear(fxMesa->clearC, fxMesa->clearA, clearD);
      break;
    case DD_BACK_LEFT_BIT:
      /* back buffer only */
      FX_grDepthMask(FXFALSE);
      FX_grRenderBuffer(GR_BUFFER_BACKBUFFER);
      FX_grBufferClear(fxMesa->clearC, fxMesa->clearA, clearD);
      if (ctx->Depth.Mask) {
        FX_grDepthMask(FXTRUE);
      }
      break;
    case DD_FRONT_LEFT_BIT:
      /* front buffer only */
      FX_grDepthMask(FXFALSE);
      FX_grRenderBuffer(GR_BUFFER_FRONTBUFFER);
      FX_grBufferClear(fxMesa->clearC, fxMesa->clearA, clearD);
      if (ctx->Depth.Mask) {
        FX_grDepthMask(FXTRUE);
      }
      break;
    case DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT:
      /* front and back */
      FX_grDepthMask(FXFALSE);
      FX_grRenderBuffer(GR_BUFFER_BACKBUFFER);
      FX_grBufferClear(fxMesa->clearC, fxMesa->clearA, clearD);
      FX_grRenderBuffer(GR_BUFFER_FRONTBUFFER);
      FX_grBufferClear(fxMesa->clearC, fxMesa->clearA, clearD);
      if (ctx->Depth.Mask) {
        FX_grDepthMask(FXTRUE);
      }
      break;
    case DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT | DD_DEPTH_BIT:
      /* clear front */
      FX_grDepthMask(FXFALSE);
      FX_grRenderBuffer(GR_BUFFER_FRONTBUFFER);
      FX_grBufferClear(fxMesa->clearC, fxMesa->clearA, clearD);
      /* clear back and depth */
      FX_grDepthMask(FXTRUE);
      FX_grRenderBuffer(GR_BUFFER_BACKBUFFER);
      FX_grBufferClear(fxMesa->clearC, fxMesa->clearA, clearD);
      if (!ctx->Depth.Mask) {
        FX_grDepthMask(FXFALSE);
      }
      break;
    case DD_DEPTH_BIT:
      /* just the depth buffer */
      FX_grRenderBuffer(GR_BUFFER_BACKBUFFER);
      FX_grColorMask(FXFALSE,FXFALSE);
      FX_grDepthMask(FXTRUE);
      FX_grBufferClear(fxMesa->clearC, fxMesa->clearA, clearD);
      FX_grColorMask(FXTRUE, ctx->Color.ColorMask[ACOMP] && fxMesa->haveAlphaBuffer);
      if (ctx->Color.DrawDestMask & FRONT_LEFT_BIT)
        FX_grRenderBuffer(GR_BUFFER_FRONTBUFFER);
      if (!ctx->Depth.Test || !ctx->Depth.Mask)
        FX_grDepthMask(FXFALSE);
      break;
    default:
      /* error */
      ;
  }

  return softwareMask;
}


/* Set the buffer used for drawing */
/* XXX support for separate read/draw buffers hasn't been tested */
static GLboolean fxDDSetDrawBuffer(GLcontext *ctx, GLenum mode)
{
  fxMesaContext fxMesa=(fxMesaContext)ctx->DriverCtx;

  if (MESA_VERBOSE&VERBOSE_DRIVER) {
    fprintf(stderr,"fxmesa: fxDDSetBuffer(%x)\n", (int) mode);
  }

  if (mode == GL_FRONT_LEFT) {
    fxMesa->currentFB = GR_BUFFER_FRONTBUFFER;
    FX_grRenderBuffer(fxMesa->currentFB);
    return GL_TRUE;
  }
  else if (mode == GL_BACK_LEFT) {
    fxMesa->currentFB = GR_BUFFER_BACKBUFFER;
    FX_grRenderBuffer(fxMesa->currentFB);
    return GL_TRUE;
  }
  else if (mode == GL_NONE) {
    FX_grColorMask(FXFALSE,FXFALSE);
    return GL_TRUE;
  }
  else {
    return GL_FALSE;
  }
}


/* Set the buffer used for reading */
/* XXX support for separate read/draw buffers hasn't been tested */
static void fxDDSetReadBuffer(GLcontext *ctx, GLframebuffer *buffer,
                              GLenum mode )
{
  fxMesaContext fxMesa=(fxMesaContext)ctx->DriverCtx;
  (void) buffer;

  if (MESA_VERBOSE&VERBOSE_DRIVER) {
    fprintf(stderr,"fxmesa: fxDDSetBuffer(%x)\n", (int) mode);
  }

  if (mode == GL_FRONT_LEFT) {
    fxMesa->currentFB = GR_BUFFER_FRONTBUFFER;
    FX_grRenderBuffer(fxMesa->currentFB);
  }
  else if (mode == GL_BACK_LEFT) {
    fxMesa->currentFB = GR_BUFFER_BACKBUFFER;
    FX_grRenderBuffer(fxMesa->currentFB);
  }
}


#ifdef XF86DRI
/* test if window coord (px,py) is visible */
static GLboolean inClipRects(fxMesaContext fxMesa, int px, int py)
{
  int i;
  for (i=0; i<fxMesa->numClipRects; i++) {
    if ((px>=fxMesa->pClipRects[i].x1) && 
	(px<fxMesa->pClipRects[i].x2) &&
	(py>=fxMesa->pClipRects[i].y1) && 
	(py<fxMesa->pClipRects[i].y2)) return GL_TRUE;
  }
  return GL_FALSE;
}
#endif


static GLboolean fxDDDrawBitmap(GLcontext *ctx, GLint px, GLint py,
                                GLsizei width, GLsizei height,
                                const struct gl_pixelstore_attrib *unpack,
                                const GLubyte *bitmap)
{
  fxMesaContext fxMesa=(fxMesaContext)ctx->DriverCtx;
  GrLfbInfo_t info;
  FxU16 color;
  const struct gl_pixelstore_attrib *finalUnpack;
  struct gl_pixelstore_attrib scissoredUnpack;

  /* check if there's any raster operations enabled which we can't handle */
  if (ctx->RasterMask & (ALPHATEST_BIT |
                         BLEND_BIT |
                         DEPTH_BIT |
                         FOG_BIT |
                         LOGIC_OP_BIT |
                         SCISSOR_BIT |
                         STENCIL_BIT |
                         MASKING_BIT |
                         ALPHABUF_BIT |
                         MULTI_DRAW_BIT))
    return GL_FALSE;

  if (ctx->Scissor.Enabled) {
    /* This is a bit tricky, but by carefully adjusting the px, py,
     * width, height, skipPixels and skipRows values we can do
     * scissoring without special code in the rendering loop.
     */

    /* we'll construct a new pixelstore struct */
    finalUnpack = &scissoredUnpack;
    scissoredUnpack = *unpack;
    if (scissoredUnpack.RowLength == 0)
      scissoredUnpack.RowLength = width;

    /* clip left */
    if (px < ctx->Scissor.X) {
      scissoredUnpack.SkipPixels += (ctx->Scissor.X - px);
      width -= (ctx->Scissor.X - px);
      px = ctx->Scissor.X;
    }
    /* clip right */
    if (px + width >= ctx->Scissor.X + ctx->Scissor.Width) {
      width -= (px + width - (ctx->Scissor.X + ctx->Scissor.Width));
    }
    /* clip bottom */
    if (py < ctx->Scissor.Y) {
      scissoredUnpack.SkipRows += (ctx->Scissor.Y - py);
      height -= (ctx->Scissor.Y - py);
      py = ctx->Scissor.Y;
    }
    /* clip top */
    if (py + height >= ctx->Scissor.Y + ctx->Scissor.Height) {
      height -= (py + height - (ctx->Scissor.Y + ctx->Scissor.Height));
    }

    if (width <= 0 || height <= 0)
      return GL_TRUE;  /* totally scissored away */
  }  
  else {
    finalUnpack = unpack;
  }

  /* compute pixel value */
  {
    GLint r = (GLint) (ctx->Current.RasterColor[0] * 255.0f);
    GLint g = (GLint) (ctx->Current.RasterColor[1] * 255.0f);
    GLint b = (GLint) (ctx->Current.RasterColor[2] * 255.0f);
    /*GLint a = (GLint)(ctx->Current.RasterColor[3]*255.0f);*/
    if (fxMesa->bgrOrder)
      color = (FxU16)
        ( ((FxU16)0xf8 & b) << (11-3))  |
        ( ((FxU16)0xfc & g) << (5-3+1)) |
        ( ((FxU16)0xf8 & r) >> 3);
    else
      color = (FxU16)
        ( ((FxU16)0xf8 & r) << (11-3))  |
        ( ((FxU16)0xfc & g) << (5-3+1)) |
        ( ((FxU16)0xf8 & b) >> 3);
  }

  info.size = sizeof(info);
  if (!FX_grLfbLock(GR_LFB_WRITE_ONLY,
                    fxMesa->currentFB,
                    GR_LFBWRITEMODE_565,
                    GR_ORIGIN_UPPER_LEFT,
                    FXFALSE,
                    &info)) {
#ifndef FX_SILENT
    fprintf(stderr,"fx Driver: error locking the linear frame buffer\n");
#endif
    return GL_TRUE;
  }

#ifdef XF86DRI
#define INSIDE(c, x, y) inClipRects((c), (x), (y))
#else
#define INSIDE(c, x, y) (1)
#endif

  {
    const GLint winX = fxMesa->x_offset;
    const GLint winY = fxMesa->y_offset + fxMesa->height - 1;
    /* The dest stride depends on the hardware and whether we're drawing
     * to the front or back buffer.  This compile-time test seems to do
     * the job for now.
     */
#ifdef XF86DRI
    const GLint dstStride = (fxMesa->glCtx->Color.DrawBuffer == GL_FRONT)
                          ? (fxMesa->screen_width) : (info.strideInBytes / 2);
#else
    const GLint dstStride = info.strideInBytes / 2; /* stride in GLushorts */
#endif
    GLint row;
    /* compute dest address of bottom-left pixel in bitmap */
    GLushort *dst = (GLushort *) info.lfbPtr
                  + (winY - py) * dstStride
                  + (winX + px);

    for (row = 0; row < height; row++) {
      const GLubyte *src = (const GLubyte *) _mesa_image_address( finalUnpack,
                 bitmap, width, height, GL_COLOR_INDEX, GL_BITMAP, 0, row, 0 );
      if (finalUnpack->LsbFirst) {
        /* least significan bit first */
        GLubyte mask = 1U << (finalUnpack->SkipPixels & 0x7);
        GLint col;
        for (col=0; col<width; col++) {
          if (*src & mask) {
            if (INSIDE(fxMesa, winX + px + col, winY - py - row))
              dst[col] = color;
          }
          if (mask == 128U) {
            src++;
            mask = 1U;
          }
          else {
            mask = mask << 1;
          }
        }
        if (mask != 1)
          src++;
      }
      else {
        /* most significan bit first */
        GLubyte mask = 128U >> (finalUnpack->SkipPixels & 0x7);
        GLint col;
        for (col=0; col<width; col++) {
          if (*src & mask) {
            if (INSIDE(fxMesa, winX + px + col, winY - py - row))
              dst[col] = color;
          }
          if (mask == 1U) {
            src++;
            mask = 128U;
          }
          else {
            mask = mask >> 1;
          }
        }
        if (mask != 128)
          src++;
      }
      dst -= dstStride;
    }
  }

#undef INSIDE

  FX_grLfbUnlock(GR_LFB_WRITE_ONLY,fxMesa->currentFB);
  return GL_TRUE;
}


static GLboolean fxDDReadPixels( GLcontext *ctx, GLint x, GLint y,
                                 GLsizei width, GLsizei height,
                                 GLenum format, GLenum type,
                                 const struct gl_pixelstore_attrib *packing,
                                 GLvoid *dstImage )
{
  if (ctx->Pixel.ScaleOrBiasRGBA || ctx->Pixel.MapColorFlag) {
    return GL_FALSE;  /* can't do this */
  }
  else {
    fxMesaContext fxMesa=(fxMesaContext)ctx->DriverCtx;
    GrLfbInfo_t info;
    GLboolean result = GL_FALSE;

    BEGIN_BOARD_LOCK();
    if (grLfbLock(GR_LFB_READ_ONLY,
                  fxMesa->currentFB,
                  GR_LFBWRITEMODE_ANY,
                  GR_ORIGIN_UPPER_LEFT,
                  FXFALSE,
                  &info)) {
      const GLint winX = fxMesa->x_offset;
      const GLint winY = fxMesa->y_offset + fxMesa->height - 1;
#ifdef XF86DRI
      const GLint srcStride = (fxMesa->glCtx->Color.DrawBuffer == GL_FRONT)
                          ? (fxMesa->screen_width) : (info.strideInBytes / 2);
#else
      const GLint srcStride = info.strideInBytes / 2; /* stride in GLushorts */
#endif
      const GLushort *src = (const GLushort *) info.lfbPtr
                          + (winY - y) * srcStride + (winX + x);
      GLubyte *dst = (GLubyte *) _mesa_image_address(packing, dstImage,
                                         width, height, format, type, 0, 0, 0);
      GLint dstStride = _mesa_image_row_stride(packing, width, format, type);

      if (format == GL_RGB && type == GL_UNSIGNED_BYTE) {
        /* convert 5R6G5B into 8R8G8B */
        GLint row, col;
        const GLint halfWidth = width >> 1;
        const GLint extraPixel = (width & 1);
        for (row = 0; row < height; row++) {
          GLubyte *d = dst;
          for (col = 0; col < halfWidth; col++) {
            const GLuint pixel = ((const GLuint *) src)[col];
            const GLint pixel0 = pixel & 0xffff;
            const GLint pixel1 = pixel >> 16;
            *d++ = FX_PixelToR[pixel0];
            *d++ = FX_PixelToG[pixel0];
            *d++ = FX_PixelToB[pixel0];
            *d++ = FX_PixelToR[pixel1];
            *d++ = FX_PixelToG[pixel1];
            *d++ = FX_PixelToB[pixel1];
          }
          if (extraPixel) {
            GLushort pixel = src[width-1];
            *d++ = FX_PixelToR[pixel];
            *d++ = FX_PixelToG[pixel];
            *d++ = FX_PixelToB[pixel];
          }
          dst += dstStride;
          src -= srcStride;
        }
        result = GL_TRUE;
      }
      else if (format == GL_RGBA && type == GL_UNSIGNED_BYTE) {
        /* convert 5R6G5B into 8R8G8B8A */
        GLint row, col;
        const GLint halfWidth = width >> 1;
        const GLint extraPixel = (width & 1);
        for (row = 0; row < height; row++) {
          GLubyte *d = dst;
          for (col = 0; col < halfWidth; col++) {
            const GLuint pixel = ((const GLuint *) src)[col];
            const GLint pixel0 = pixel & 0xffff;
            const GLint pixel1 = pixel >> 16;
            *d++ = FX_PixelToR[pixel0];
            *d++ = FX_PixelToG[pixel0];
            *d++ = FX_PixelToB[pixel0];
            *d++ = 255;
            *d++ = FX_PixelToR[pixel1];
            *d++ = FX_PixelToG[pixel1];
            *d++ = FX_PixelToB[pixel1];
            *d++ = 255;
          }
          if (extraPixel) {
            const GLushort pixel = src[width-1];
            *d++ = FX_PixelToR[pixel];
            *d++ = FX_PixelToG[pixel];
            *d++ = FX_PixelToB[pixel];
            *d++ = 255;
          }
          dst += dstStride;
          src -= srcStride;
        }
        result = GL_TRUE;
      }
      else if (format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5) {
        /* directly memcpy 5R6G5B pixels into client's buffer */
        const GLint widthInBytes = width * 2;
        GLint row;
        for (row = 0; row < height; row++) {
          MEMCPY(dst, src, widthInBytes);
          dst += dstStride;
          src -= srcStride;
        }
        result = GL_TRUE;
      }
      else {
        result = GL_FALSE;
      }

      grLfbUnlock(GR_LFB_READ_ONLY, fxMesa->currentFB);
    }
    END_BOARD_LOCK();
    return result;
  }
}



static void fxDDFinish(GLcontext *ctx)
{
  FX_grFlush();
}


static GLint fxDDGetParameteri(const GLcontext *ctx, GLint param)
{
  switch(param) {
  case DD_HAVE_HARDWARE_FOG:
    return 1;
  default:
    fprintf(stderr,"fx Driver: internal error in fxDDGetParameteri(): %x\n", (int) param);
    fxCloseHardware();
    exit(-1);
    return 0;
  }
}


void fxDDSetNearFar(GLcontext *ctx, GLfloat n, GLfloat f)
{
   FX_CONTEXT(ctx)->new_state |= FX_NEW_FOG;
   ctx->Driver.RenderStart = fxSetupFXUnits;
}

/* KW: Put the word Mesa in the render string because quakeworld
 * checks for this rather than doing a glGet(GL_MAX_TEXTURE_SIZE).
 * Why?
 */
static const GLubyte *fxDDGetString(GLcontext *ctx, GLenum name)
{
#if defined(GLX_DIRECT_RENDERING)
  /* Building for DRI driver */
  switch (name) {
    case GL_RENDERER:
      {
        static char buffer[100];
        char hardware[100];
        strcpy(hardware, grGetString(GR_HARDWARE));
        if (strcmp(hardware, "Voodoo3 (tm)") == 0)
          strcpy(hardware, "Voodoo3");
        else if (strcmp(hardware, "Voodoo Banshee (tm)") == 0)
          strcpy(hardware, "VoodooBanshee");
        else {
          /* unexpected result: replace spaces with hyphens */
          int i;
          for (i = 0; hardware[i]; i++) {
            if (hardware[i] == ' ' || hardware[i] == '\t')
              hardware[i] = '-';
          }
        }
        /* now make the GL_RENDERER string */
        sprintf(buffer, "Mesa DRI %s 20000510", hardware);
        return buffer;
      }
    case GL_VENDOR:
      return "Precision Insight, Inc.";
    default:
      return NULL;
  }

#else

  /* Building for Voodoo1/2 stand-alone Mesa */
  switch (name) {
    case GL_RENDERER:
      {
        static char buf[80];

        if (glbHWConfig.SSTs[glbCurrentBoard].type==GR_SSTTYPE_VOODOO) {
          GrVoodooConfig_t *vc = 
            &glbHWConfig.SSTs[glbCurrentBoard].sstBoard.VoodooConfig;

          sprintf(buf,
                  "Mesa Glide v0.30 Voodoo_Graphics %d "
                  "CARD/%d FB/%d TM/%d TMU/%s",
                  glbCurrentBoard,
                  (vc->sliDetect ? (vc->fbRam*2) : vc->fbRam),
                  (vc->tmuConfig[GR_TMU0].tmuRam +
                   ((vc->nTexelfx>1) ? vc->tmuConfig[GR_TMU1].tmuRam : 0)),
                  vc->nTexelfx,
                  (vc->sliDetect ? "SLI" : "NOSLI"));
        }
        else if (glbHWConfig.SSTs[glbCurrentBoard].type==GR_SSTTYPE_SST96) {
          GrSst96Config_t *sc = 
            &glbHWConfig.SSTs[glbCurrentBoard].sstBoard.SST96Config;

          sprintf(buf,
                  "Glide v0.30 Voodoo_Rush %d "
                  "CARD/%d FB/%d TM/%d TMU/NOSLI",
                  glbCurrentBoard,
                  sc->fbRam,
                  sc->tmuConfig.tmuRam,
                  sc->nTexelfx);
        }
        else {
          strcpy(buf, "Glide v0.30 UNKNOWN");
        }
        return (GLubyte *) buf;
      }
    default:
      return NULL;
  }
#endif
}


int fxDDInitFxMesaContext( fxMesaContext fxMesa )
{
  
   FX_setupGrVertexLayout();
   
   if (getenv("FX_EMULATE_SINGLE_TMU")) 
      fxMesa->haveTwoTMUs = GL_FALSE;
      
   fxMesa->emulateTwoTMUs = fxMesa->haveTwoTMUs;
   
   if (!getenv("FX_DONT_FAKE_MULTITEX")) 
      fxMesa->emulateTwoTMUs = GL_TRUE;
      
   if(getenv("FX_GLIDE_SWAPINTERVAL"))
      fxMesa->swapInterval=atoi(getenv("FX_GLIDE_SWAPINTERVAL"));
   else
      fxMesa->swapInterval=1;

   if(getenv("MESA_FX_SWAP_PENDING"))
      fxMesa->maxPendingSwapBuffers=atoi(getenv("MESA_FX_SWAP_PENDING"));
   else
      fxMesa->maxPendingSwapBuffers=2;
   
   if(getenv("MESA_FX_INFO"))
      fxMesa->verbose=GL_TRUE;
   else
      fxMesa->verbose=GL_FALSE;

   fxMesa->color=0xffffffff;
   fxMesa->clearC=0;
   fxMesa->clearA=0;

   fxMesa->stats.swapBuffer=0;
   fxMesa->stats.reqTexUpload=0;
   fxMesa->stats.texUpload=0;
   fxMesa->stats.memTexUpload=0;

   fxMesa->tmuSrc=FX_TMU_NONE;
   fxMesa->lastUnitsMode=FX_UM_NONE;
   fxTMInit(fxMesa);

   /* FX units setup */

   fxMesa->unitsState.alphaTestEnabled=GL_FALSE;
   fxMesa->unitsState.alphaTestFunc=GR_CMP_ALWAYS;
   fxMesa->unitsState.alphaTestRefValue=0;

   fxMesa->unitsState.blendEnabled=GL_FALSE;
   fxMesa->unitsState.blendSrcFuncRGB=GR_BLEND_ONE;
   fxMesa->unitsState.blendDstFuncRGB=GR_BLEND_ZERO;
   fxMesa->unitsState.blendSrcFuncAlpha=GR_BLEND_ONE;
   fxMesa->unitsState.blendDstFuncAlpha=GR_BLEND_ZERO;

   fxMesa->unitsState.depthTestEnabled	=GL_FALSE;
   fxMesa->unitsState.depthMask		=GL_TRUE;
   fxMesa->unitsState.depthTestFunc	=GR_CMP_LESS;

   FX_grColorMask(FXTRUE, fxMesa->haveAlphaBuffer ? FXTRUE : FXFALSE);
   if(fxMesa->haveDoubleBuffer) {
      fxMesa->currentFB=GR_BUFFER_BACKBUFFER;
      FX_grRenderBuffer(GR_BUFFER_BACKBUFFER);
   } else {
      fxMesa->currentFB=GR_BUFFER_FRONTBUFFER;
      FX_grRenderBuffer(GR_BUFFER_FRONTBUFFER);
   }
  
   fxMesa->state 	= NULL;
   fxMesa->fogTable 	= NULL;
  
   fxMesa->state 	= malloc(FX_grGetInteger(FX_GLIDE_STATE_SIZE));
   fxMesa->fogTable 	= malloc(FX_grGetInteger(FX_FOG_TABLE_ENTRIES)*sizeof(GrFog_t));
  
   if (!fxMesa->state || !fxMesa->fogTable) {
      if (fxMesa->state) free(fxMesa->state);
      if (fxMesa->fogTable) free(fxMesa->fogTable);
      return 0;
   }

   if(fxMesa->haveZBuffer)
      FX_grDepthBufferMode(GR_DEPTHBUFFER_ZBUFFER);
    
#if (!FXMESA_USE_ARGB)
   FX_grLfbWriteColorFormat(GR_COLORFORMAT_ABGR); /* Not every Glide has this */
#endif

   fxMesa->textureAlign=FX_grGetInteger(FX_TEXTURE_ALIGN);
   fxMesa->glCtx->Const.MaxTextureLevels=9;
   fxMesa->glCtx->Const.MaxTextureSize=256;
   fxMesa->glCtx->Const.MaxTextureUnits=fxMesa->emulateTwoTMUs ? 2 : 1;
   fxMesa->glCtx->NewState|=NEW_DRVSTATE1;
   fxMesa->new_state = NEW_ALL;
  
   fxDDSetupInit();
   fxDDCvaInit();
   fxDDClipInit();
   fxDDTrifuncInit();
   fxDDFastPathInit();

   fxSetupDDPointers(fxMesa->glCtx);
   fxDDRenderInit(fxMesa->glCtx);
   fxDDInitExtensions(fxMesa->glCtx);  

   fxDDSetNearFar(fxMesa->glCtx,1.0,100.0);
  
   FX_grGlideGetState((GrState*)fxMesa->state);

   /* XXX Fix me: callback not registered when main VB is created.
    */
   if (fxMesa->glCtx->VB) 
      fxDDRegisterVB( fxMesa->glCtx->VB );
  
   /* XXX Fix me too: need to have the 'struct dd' prepared prior to
    * creating the context... The below is broken if you try to insert
    * new stages.  
    */
   if (fxMesa->glCtx->NrPipelineStages)
      fxMesa->glCtx->NrPipelineStages = fxDDRegisterPipelineStages( 
	 fxMesa->glCtx->PipelineStage,
	 fxMesa->glCtx->PipelineStage,
	 fxMesa->glCtx->NrPipelineStages);

   /* Run the config file */
   gl_context_initialize( fxMesa->glCtx );

   return 1;
}


#if 0
/* Example extension function */
static void fxFooBarEXT(GLint i)
{
   printf("You called glFooBarEXT(%d)\n", i);
}
#endif


void fxDDInitExtensions( GLcontext *ctx )
{
   fxMesaContext fxMesa=(fxMesaContext)ctx->DriverCtx;

   gl_extensions_disable(ctx, "GL_EXT_blend_logic_op");
   gl_extensions_disable(ctx, "GL_EXT_blend_minmax");
   gl_extensions_disable(ctx, "GL_EXT_blend_subtract");
   gl_extensions_disable(ctx, "GL_EXT_blend_color");

   gl_extensions_add(ctx, DEFAULT_ON, "3DFX_set_global_palette", 0);
   
   if (!fxMesa->haveTwoTMUs)
      gl_extensions_disable(ctx, "GL_EXT_texture_env_add");
   
   if (!fxMesa->emulateTwoTMUs) 
      gl_extensions_disable(ctx, "GL_ARB_multitexture");


   /* Example of hooking in an extension function.
    * For DRI-based drivers, also see __driRegisterExtensions in the
    * tdfx_xmesa.c file.
    */
#if 0
   {
     void **dispatchTable = (void **) ctx->Exec;
     const int _gloffset_FooBarEXT = 555;  /* just an example number! */
     const int tabSize = _glapi_get_dispatch_table_size();
     assert(_gloffset_FooBarEXT < tabSize);
     dispatchTable[_gloffset_FooBarEXT] = (void *) fxFooBarEXT;
     /* XXX You would also need to hook into the display list dispatch
      * table.  Really, the implementation of extensions might as well
      * be in the core of Mesa since core Mesa and the device driver
      * is one big shared lib.
      */
  }
#endif
}


/************************************************************************/
/************************************************************************/
/************************************************************************/

/* Check if the hardware supports the current context 
 *
 * Performs similar work to fxDDChooseRenderState() - should be merged.
 */
static GLboolean fxIsInHardware(GLcontext *ctx)
{
   fxMesaContext fxMesa=(fxMesaContext)ctx->DriverCtx;

  if (!ctx->Hint.AllowDrawMem)
     return GL_TRUE;		/* you'll take it and like it */

  if((ctx->RasterMask & (STENCIL_BIT | MULTI_DRAW_BIT)) ||
     ((ctx->Color.BlendEnabled) && (ctx->Color.BlendEquation!=GL_FUNC_ADD_EXT)) ||
     ((ctx->Color.ColorLogicOpEnabled) && (ctx->Color.LogicOp!=GL_COPY)) ||
     (ctx->Light.Model.ColorControl==GL_SEPARATE_SPECULAR_COLOR) ||
     (!((ctx->Color.ColorMask[RCOMP]==ctx->Color.ColorMask[GCOMP]) &&
        (ctx->Color.ColorMask[GCOMP]==ctx->Color.ColorMask[BCOMP]) &&
        (ctx->Color.ColorMask[ACOMP]==ctx->Color.ColorMask[ACOMP])))
     )
  {
     return GL_FALSE;
  }
  /* Unsupported texture/multitexture cases */

  if(fxMesa->emulateTwoTMUs) {
    if((ctx->Enabled & (TEXTURE0_3D | TEXTURE1_3D)) ||
       /* Not very well written ... */
       ((ctx->Enabled & (TEXTURE0_1D | TEXTURE1_1D)) && 
        ((ctx->Enabled & (TEXTURE0_2D | TEXTURE1_2D))!=(TEXTURE0_2D | TEXTURE1_2D)))
       ) {
      return GL_FALSE;
    }

    if (ctx->Texture.ReallyEnabled & TEXTURE0_2D) {
      if (ctx->Texture.Unit[0].EnvMode == GL_BLEND &&
	  (ctx->Texture.ReallyEnabled & TEXTURE1_2D ||
	   ctx->Texture.Unit[0].EnvColor[0] != 0 ||
	   ctx->Texture.Unit[0].EnvColor[1] != 0 ||
	   ctx->Texture.Unit[0].EnvColor[2] != 0 ||
	   ctx->Texture.Unit[0].EnvColor[3] != 1)) {
        return GL_FALSE;
      }
      if (ctx->Texture.Unit[0].Current->Image[0]->Border > 0)
        return GL_FALSE;
    }

    if (ctx->Texture.ReallyEnabled & TEXTURE1_2D) {
      if (ctx->Texture.Unit[1].EnvMode == GL_BLEND)
        return GL_FALSE;
      if (ctx->Texture.Unit[0].Current->Image[0]->Border > 0)
        return GL_FALSE;
    }

    if (MESA_VERBOSE & (VERBOSE_DRIVER|VERBOSE_TEXTURE))
       fprintf(stderr, "fxMesa: fxIsInHardware, envmode is %s/%s\n",
	       gl_lookup_enum_by_nr(ctx->Texture.Unit[0].EnvMode),
	       gl_lookup_enum_by_nr(ctx->Texture.Unit[1].EnvMode));

    /* KW: This was wrong (I think) and I changed it... which doesn't mean
     * it is now correct...
     */
    if((ctx->Enabled & (TEXTURE0_1D | TEXTURE0_2D | TEXTURE0_3D)) &&
       (ctx->Enabled & (TEXTURE1_1D | TEXTURE1_2D | TEXTURE1_3D)))
    {
       /* Can't use multipass to blend a multitextured triangle - fall
	* back to software.
	*/
      if (!fxMesa->haveTwoTMUs && ctx->Color.BlendEnabled) {
	  return GL_FALSE;
      }
	  
       if ((ctx->Texture.Unit[0].EnvMode!=ctx->Texture.Unit[1].EnvMode) &&
	   (ctx->Texture.Unit[0].EnvMode!=GL_MODULATE) &&
	   (ctx->Texture.Unit[0].EnvMode!=GL_REPLACE)) /* q2, seems ok... */
       {
	  if (MESA_VERBOSE&VERBOSE_DRIVER)
	    fprintf(stderr, "fxMesa: unsupported multitex env mode\n");
	  return GL_FALSE;
       }
    }
  } else {
    if((ctx->Enabled & (TEXTURE1_1D | TEXTURE1_2D | TEXTURE1_3D)) ||
       /* Not very well written ... */
       ((ctx->Enabled & TEXTURE0_1D) && 
        (!(ctx->Enabled & TEXTURE0_2D)))
       ) {
      return GL_FALSE;
    }

    
    if((ctx->Texture.ReallyEnabled & TEXTURE0_2D) &&
       (ctx->Texture.Unit[0].EnvMode==GL_BLEND)) {
      return GL_FALSE;
    }
  }

  return GL_TRUE;
}



#define INTERESTED (~(NEW_MODELVIEW|NEW_PROJECTION|NEW_PROJECTION|NEW_TEXTURE_MATRIX|NEW_USER_CLIP|NEW_CLIENT_STATE|NEW_TEXTURE_ENABLE))

static void fxDDUpdateDDPointers(GLcontext *ctx)
{
  fxMesaContext fxMesa=(fxMesaContext)ctx->DriverCtx;
  GLuint new_state = ctx->NewState;

  if (MESA_VERBOSE&(VERBOSE_DRIVER|VERBOSE_STATE)) 
    fprintf(stderr,"fxmesa: fxDDUpdateDDPointers(...)\n");

  if (new_state & (NEW_RASTER_OPS|NEW_TEXTURING)) 
     fxMesa->is_in_hardware = fxIsInHardware(ctx);

  if (fxMesa->is_in_hardware) {
    if (fxMesa->new_state)
      fxSetupFXUnits(ctx);

    if(new_state & INTERESTED) {
      fxDDChooseRenderState( ctx );
      fxMesa->RenderVBTables=fxDDChooseRenderVBTables(ctx);
      fxMesa->RenderVBClippedTab=fxMesa->RenderVBTables[0];
      fxMesa->RenderVBCulledTab=fxMesa->RenderVBTables[1];
      fxMesa->RenderVBRawTab=fxMesa->RenderVBTables[2];

      ctx->Driver.RasterSetup=fxDDChooseSetupFunction(ctx);
    }
      
    ctx->Driver.PointsFunc=fxMesa->PointsFunc;
    ctx->Driver.LineFunc=fxMesa->LineFunc;
    ctx->Driver.TriangleFunc=fxMesa->TriangleFunc;
    ctx->Driver.QuadFunc=fxMesa->QuadFunc;
  } else {
     fxMesa->render_index = FX_FALLBACK;
  }
}

static void fxDDReducedPrimitiveChange(GLcontext *ctx, GLenum prim)
{
  if (ctx->Polygon.CullFlag) {
    if (ctx->PB->primitive != GL_POLYGON) { /* Lines or Points */
      FX_grCullMode(GR_CULL_DISABLE);
      FX_CONTEXT(ctx)->cullMode=GR_CULL_DISABLE;
    }
  }
}

void fxSetupDDPointers(GLcontext *ctx)
{
  if (MESA_VERBOSE&VERBOSE_DRIVER) {
    fprintf(stderr,"fxmesa: fxSetupDDPointers()\n");
  }

  ctx->Driver.UpdateState=fxDDUpdateDDPointers;

  ctx->Driver.WriteDepthSpan=fxDDWriteDepthSpan;
  ctx->Driver.WriteDepthPixels=fxDDWriteDepthPixels;
  ctx->Driver.ReadDepthSpan=fxDDReadDepthSpan;
  ctx->Driver.ReadDepthPixels=fxDDReadDepthPixels;
         
  ctx->Driver.GetString=fxDDGetString;

  ctx->Driver.Dither=fxDDDither;

  ctx->Driver.NearFar=fxDDSetNearFar;

  ctx->Driver.GetParameteri=fxDDGetParameteri;

  ctx->Driver.ClearIndex=NULL;
  ctx->Driver.ClearColor=fxDDClearColor;
  ctx->Driver.Clear=fxDDClear;

  ctx->Driver.Index=NULL;
  ctx->Driver.Color=fxDDSetColor;

  ctx->Driver.SetDrawBuffer=fxDDSetDrawBuffer;
  ctx->Driver.SetReadBuffer=fxDDSetReadBuffer;
  ctx->Driver.GetBufferSize=fxDDBufferSize;

  ctx->Driver.Bitmap=fxDDDrawBitmap;
  ctx->Driver.DrawPixels=NULL;
  ctx->Driver.ReadPixels=fxDDReadPixels;

  ctx->Driver.Finish=fxDDFinish;
  ctx->Driver.Flush=NULL;

  ctx->Driver.RenderStart=NULL;
  ctx->Driver.RenderFinish=NULL;

  ctx->Driver.TexImage2D = fxDDTexImage2D;
  ctx->Driver.TexSubImage2D = fxDDTexSubImage2D;
  ctx->Driver.GetTexImage = fxDDGetTexImage;
  ctx->Driver.TexEnv=fxDDTexEnv;
  ctx->Driver.TexParameter=fxDDTexParam;
  ctx->Driver.BindTexture=fxDDTexBind;
  ctx->Driver.DeleteTexture=fxDDTexDel;
  ctx->Driver.UpdateTexturePalette=fxDDTexPalette;

  ctx->Driver.RectFunc=NULL;

  ctx->Driver.AlphaFunc=fxDDAlphaFunc;
  ctx->Driver.BlendFunc=fxDDBlendFunc;
  ctx->Driver.DepthFunc=fxDDDepthFunc;
  ctx->Driver.DepthMask=fxDDDepthMask;
  ctx->Driver.ColorMask=fxDDColorMask;
  ctx->Driver.Fogfv=fxDDFogfv;
  ctx->Driver.Scissor=fxDDScissor;
  ctx->Driver.FrontFace=fxDDFrontFace;
  ctx->Driver.CullFace=fxDDCullFace;
  ctx->Driver.ShadeModel=fxDDShadeModel;
  ctx->Driver.Enable=fxDDEnable;
  ctx->Driver.ReducedPrimitiveChange=fxDDReducedPrimitiveChange;

  ctx->Driver.RegisterVB=fxDDRegisterVB;
  ctx->Driver.UnregisterVB=fxDDUnregisterVB;

  ctx->Driver.RegisterPipelineStages = fxDDRegisterPipelineStages;

  ctx->Driver.OptimizeImmediatePipeline = 0; /* nothing done yet */
  ctx->Driver.OptimizePrecalcPipeline = 0;

/*    if (getenv("MESA_USE_FAST") || getenv("FX_USE_FAST")) */
/*       ctx->Driver.OptimizePrecalcPipeline = fxDDOptimizePrecalcPipeline; */

  if (!getenv("FX_NO_FAST")) 
      ctx->Driver.BuildPrecalcPipeline = fxDDBuildPrecalcPipeline; 

  ctx->Driver.TriangleCaps = DD_TRI_CULL|DD_TRI_OFFSET|DD_TRI_LIGHT_TWOSIDE;

  fxSetupDDSpanPointers(ctx);

  FX_CONTEXT(ctx)->render_index = 1; /* force an update */
  fxDDUpdateDDPointers(ctx);
}


#else


/*
 * Need this to provide at least one external definition.
 */

int gl_fx_dummy_function_dd(void)
{
  return 0;
}

#endif  /* FX */

