path: root/src/mesa/drivers/glide/fxdd.c

/*
 * 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 "mtypes.h"
#include "fxdrv.h"
#include "enums.h"
#include "extensions.h"
#include "texstore.h"
#include "swrast/swrast.h"
#include "swrast_setup/swrast_setup.h"
#include "tnl/tnl.h"
#include "tnl/t_context.h"
#include "tnl/t_pipeline.h"
#include "array_cache/acache.h"



float gl_ubyte_to_float_255_color_tab[256];

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

/* 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");
   }
}


/* Implements glClearColor() */
static void
fxDDClearColor(GLcontext * ctx, const GLchan color[4])
{
   fxMesaContext fxMesa = (fxMesaContext) ctx->DriverCtx;
   GLubyte col[4];

   if (MESA_VERBOSE & VERBOSE_DRIVER) {
      fprintf(stderr, "fxmesa: fxDDClearColor(%d,%d,%d,%d)\n",
	      color[0], color[1], color[2], color[3]);
   }

   ASSIGN_4V(col, color[0], color[1], color[2], 255);
   fxMesa->clearC = FXCOLOR4(col);
   fxMesa->clearA = color[3];
}


/* Clear the color and/or depth buffers */
static void
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 */
      ;
   }

   /* Clear any remaining buffers:
    */
   if (softwareMask)
      _swrast_Clear(ctx, softwareMask, all, x, y, width, height);
}


/* 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;
   }
}





static void
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->Color.AlphaEnabled ||
       ctx->Color.BlendEnabled ||
       ctx->Depth.Test ||
       ctx->Fog.Enabled ||
       ctx->Color.ColorLogicOpEnabled ||
       ctx->Stencil.Enabled ||
       ctx->Scissor.Enabled ||
       (ctx->DrawBuffer->UseSoftwareAlphaBuffers &&
	ctx->Color.ColorMask[ACOMP]) || ctx->Color.MultiDrawBuffer) {
      _swrast_Bitmap(ctx, px, py, width, height, unpack, bitmap);
      return;
   }


   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.
       *
       * KW: This code is never reached, see the test above.
       */

      /* 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;
   }
   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;
   }

   {
      const GLint winX = 0;
      const GLint winY = 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.
       */
      const GLint dstStride = info.strideInBytes / 2;	/* stride in GLushorts */

      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) {
		  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) {
		  dst[col] = color;
	       }
	       if (mask == 1U) {
		  src++;
		  mask = 128U;
	       }
	       else {
		  mask = mask >> 1;
	       }
	    }
	    if (mask != 128)
	       src++;
	 }
	 dst -= dstStride;
      }
   }

   FX_grLfbUnlock(GR_LFB_WRITE_ONLY, fxMesa->currentFB);
}


static void
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->_ImageTransferState) {
      _swrast_ReadPixels(ctx, x, y, width, height, format, type,
			 packing, dstImage);
      return;
   }
   else {
      fxMesaContext fxMesa = (fxMesaContext) ctx->DriverCtx;
      GrLfbInfo_t info;

      BEGIN_BOARD_LOCK();
      if (grLfbLock(GR_LFB_READ_ONLY,
		    fxMesa->currentFB,
		    GR_LFBWRITEMODE_ANY,
		    GR_ORIGIN_UPPER_LEFT, FXFALSE, &info)) {
	 const GLint winX = 0;
	 const GLint winY = fxMesa->height - 1;
	 const GLint srcStride = info.strideInBytes / 2;	/* stride in GLushorts */
	 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;
	    }
	 }
	 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;
	    }
	 }
	 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;
	    }
	 }
	 else {
	    grLfbUnlock(GR_LFB_READ_ONLY, fxMesa->currentFB);
	    END_BOARD_LOCK();
	    _swrast_ReadPixels(ctx, x, y, width, height, format, type,
			       packing, dstImage);
	    return;
	 }

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



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





/* 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)
{
   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;
   }
}

static const struct gl_pipeline_stage *fx_pipeline[] = {
   &_tnl_vertex_transform_stage,	/* TODO: Add the fastpath here */
   &_tnl_normal_transform_stage,
   &_tnl_lighting_stage,
   &_tnl_fog_coordinate_stage,	/* TODO: Omit fog stage */
   &_tnl_texgen_stage,
   &_tnl_texture_transform_stage,
   &_tnl_point_attenuation_stage,
   &_tnl_render_stage,
   0,
};




int
fxDDInitFxMesaContext(fxMesaContext fxMesa)
{
   int i;
   static int firsttime = 1;

   for (i = 0; i < 256; i++) {
      gl_ubyte_to_float_255_color_tab[i] = (float) i;
   }

   if (firsttime) {
#if 00
      fxDDSetupInit();
      fxDDTrifuncInit();
#endif
      firsttime = 0;
   }

   FX_setupGrVertexLayout();

   if (getenv("FX_EMULATE_SINGLE_TMU"))
      fxMesa->haveTwoTMUs = GL_FALSE;

   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 = 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);

#ifndef 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.MaxTextureUnits = fxMesa->haveTwoTMUs ? 2 : 1;
   fxMesa->new_state = _NEW_ALL;

   /* Initialize the software rasterizer and helper modules.
    */
   _swrast_CreateContext(fxMesa->glCtx);
   _ac_CreateContext(fxMesa->glCtx);
   _tnl_CreateContext(fxMesa->glCtx);
   _swsetup_CreateContext(fxMesa->glCtx);

   _tnl_destroy_pipeline(fxMesa->glCtx);
   _tnl_install_pipeline(fxMesa->glCtx, fx_pipeline);

   fxAllocVB(fxMesa->glCtx);

   fxSetupDDPointers(fxMesa->glCtx);

   /* Tell the software rasterizer to use pixel fog always.
    */
   _swrast_allow_vertex_fog(fxMesa->glCtx, GL_FALSE);
   _swrast_allow_pixel_fog(fxMesa->glCtx, GL_TRUE);

   /* Tell tnl not to calculate or use vertex fog factors.  (Needed to
    * tell render stage not to clip fog coords).
    */
/*     _tnl_calculate_vertex_fog( fxMesa->glCtx, GL_FALSE ); */

   fxDDInitExtensions(fxMesa->glCtx);

   FX_grGlideGetState((GrState *) fxMesa->state);

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

   return 1;
}

/* Undo the above.
 */
void
fxDDDestroyFxMesaContext(fxMesaContext fxMesa)
{
   _swsetup_DestroyContext(fxMesa->glCtx);
   _tnl_DestroyContext(fxMesa->glCtx);
   _ac_DestroyContext(fxMesa->glCtx);
   _swrast_DestroyContext(fxMesa->glCtx);

   if (fxMesa->state)
      free(fxMesa->state);
   if (fxMesa->fogTable)
      free(fxMesa->fogTable);
   fxTMClose(fxMesa);
   fxFreeVB(fxMesa->glCtx);
}




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

   _mesa_add_extension(ctx, GL_TRUE, "3DFX_set_global_palette", 0);
   _mesa_enable_extension(ctx, "GL_EXT_point_parameters");
   _mesa_enable_extension(ctx, "GL_EXT_paletted_texture");
   _mesa_enable_extension(ctx, "GL_EXT_texture_lod_bias");
   _mesa_enable_extension(ctx, "GL_EXT_shared_texture_palette");

   if (fxMesa->haveTwoTMUs)
      _mesa_enable_extension(ctx, "GL_EXT_texture_env_add");

   if (fxMesa->haveTwoTMUs)
      _mesa_enable_extension(ctx, "GL_ARB_multitexture");
}


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

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

   if (ctx->RenderMode != GL_RENDER)
      return GL_FALSE;

   if (ctx->Stencil.Enabled ||
       ctx->Color.MultiDrawBuffer ||
       ((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->haveTwoTMUs) {
      if (ctx->Texture._ReallyEnabled & (TEXTURE0_3D | TEXTURE1_3D))
	 return GL_FALSE;	/* can't do 3D textures */
      if (ctx->Texture._ReallyEnabled & (TEXTURE0_1D | TEXTURE1_1D))
	 return GL_FALSE;	/* can't do 1D textures */

      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[1]._Current->Image[0]->Border > 0)
	    return GL_FALSE;
      }

      if (MESA_VERBOSE & (VERBOSE_DRIVER | VERBOSE_TEXTURE))
	 fprintf(stderr, "fxMesa: fxIsInHardware, envmode is %s/%s\n",
		 _mesa_lookup_enum_by_nr(ctx->Texture.Unit[0].EnvMode),
		 _mesa_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->Texture._ReallyEnabled & (TEXTURE0_1D | TEXTURE0_2D | TEXTURE0_3D)) &&
	  (ctx->Texture._ReallyEnabled & (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->Texture._ReallyEnabled & (TEXTURE1_1D | TEXTURE1_2D | TEXTURE1_3D)) ||
	  /* Not very well written ... */
	  ((ctx->Texture._ReallyEnabled & TEXTURE0_1D) &&
           (!(ctx->Texture._ReallyEnabled & TEXTURE0_2D)))
	 ) {
	 return GL_FALSE;
      }


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

   return GL_TRUE;
}



static void
update_texture_scales(GLcontext * ctx)
{
   fxMesaContext fxMesa = FX_CONTEXT(ctx);
   struct gl_texture_unit *t0 = &ctx->Texture.Unit[fxMesa->tmu_source[0]];
   struct gl_texture_unit *t1 = &ctx->Texture.Unit[fxMesa->tmu_source[1]];

   if (t0 && t0->_Current && FX_TEXTURE_DATA(t0)) {
      fxMesa->s0scale = FX_TEXTURE_DATA(t0)->sScale;
      fxMesa->t0scale = FX_TEXTURE_DATA(t0)->tScale;
      fxMesa->inv_s0scale = 1.0 / fxMesa->s0scale;
      fxMesa->inv_t0scale = 1.0 / fxMesa->t0scale;
   }

   if (t1 && t1->_Current && FX_TEXTURE_DATA(t1)) {
      fxMesa->s1scale = FX_TEXTURE_DATA(t1)->sScale;
      fxMesa->t1scale = FX_TEXTURE_DATA(t1)->tScale;
      fxMesa->inv_s1scale = 1.0 / fxMesa->s1scale;
      fxMesa->inv_t1scale = 1.0 / fxMesa->t1scale;
   }
}

static void
fxDDUpdateDDPointers(GLcontext * ctx, GLuint new_state)
{
   /*   TNLcontext *tnl = TNL_CONTEXT(ctx);*/
   fxMesaContext fxMesa = FX_CONTEXT(ctx);

   _swrast_InvalidateState(ctx, new_state);
   _ac_InvalidateState(ctx, new_state);
   _tnl_InvalidateState(ctx, new_state);
   _swsetup_InvalidateState(ctx, new_state);

   /* Recalculate fog table on projection matrix changes.  This used to
    * be triggered by the NearFar callback.
    */
   if (new_state & _NEW_PROJECTION)
      fxMesa->new_state |= FX_NEW_FOG;

   if (new_state & (_FX_NEW_IS_IN_HARDWARE |
		    _FX_NEW_RENDERSTATE |
		    _FX_NEW_SETUP_FUNCTION | 
		    _NEW_TEXTURE)) {

      if (new_state & _FX_NEW_IS_IN_HARDWARE)
	 fxCheckIsInHardware(ctx);

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

      if (fxMesa->is_in_hardware) {
	 if (new_state & _FX_NEW_RENDERSTATE)
	    fxDDChooseRenderState(ctx);
#if 000
	 if (new_state & _FX_NEW_SETUP_FUNCTION)
	    fxDDChooseSetupState(ctx);
#endif
      }

      if (new_state & _NEW_TEXTURE)
	 update_texture_scales(ctx);
   }
}




void
fxSetupDDPointers(GLcontext * ctx)
{
   TNLcontext *tnl = TNL_CONTEXT(ctx);

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

   ctx->Driver.UpdateState = fxDDUpdateDDPointers;
   ctx->Driver.GetString = fxDDGetString;
   ctx->Driver.ClearIndex = NULL;
   ctx->Driver.ClearColor = fxDDClearColor;
   ctx->Driver.Clear = fxDDClear;
   ctx->Driver.SetDrawBuffer = fxDDSetDrawBuffer;
   ctx->Driver.GetBufferSize = fxDDBufferSize;
   ctx->Driver.Accum = _swrast_Accum;
   ctx->Driver.Bitmap = fxDDDrawBitmap;
   ctx->Driver.CopyPixels = _swrast_CopyPixels;
   ctx->Driver.DrawPixels = _swrast_DrawPixels;
   ctx->Driver.ReadPixels = fxDDReadPixels;
   ctx->Driver.ResizeBuffersMESA = _swrast_alloc_buffers;
   ctx->Driver.Finish = fxDDFinish;
   ctx->Driver.Flush = NULL;
   ctx->Driver.ChooseTextureFormat = fxDDChooseTextureFormat;
   ctx->Driver.TexImage1D = _mesa_store_teximage1d;
   ctx->Driver.TexImage2D = fxDDTexImage2D;
   ctx->Driver.TexImage3D = _mesa_store_teximage3d;
   ctx->Driver.TexSubImage1D = _mesa_store_texsubimage1d;
   ctx->Driver.TexSubImage2D = fxDDTexSubImage2D;
   ctx->Driver.TexSubImage3D = _mesa_store_texsubimage3d;
   ctx->Driver.CopyTexImage1D = _swrast_copy_teximage1d;
   ctx->Driver.CopyTexImage2D = _swrast_copy_teximage2d;
   ctx->Driver.CopyTexSubImage1D = _swrast_copy_texsubimage1d;
   ctx->Driver.CopyTexSubImage2D = _swrast_copy_texsubimage2d;
   ctx->Driver.CopyTexSubImage3D = _swrast_copy_texsubimage3d;
   ctx->Driver.TestProxyTexImage = _mesa_test_proxy_teximage;
   ctx->Driver.CopyColorTable = _swrast_CopyColorTable;
   ctx->Driver.CopyColorSubTable = _swrast_CopyColorSubTable;
   ctx->Driver.CopyConvolutionFilter1D = _swrast_CopyConvolutionFilter1D;
   ctx->Driver.CopyConvolutionFilter2D = _swrast_CopyConvolutionFilter2D;
   ctx->Driver.TexEnv = fxDDTexEnv;
   ctx->Driver.TexParameter = fxDDTexParam;
   ctx->Driver.BindTexture = fxDDTexBind;
   ctx->Driver.DeleteTexture = fxDDTexDel;
   ctx->Driver.UpdateTexturePalette = fxDDTexPalette;
   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;

   tnl->Driver.RunPipeline = _tnl_run_pipeline;

   /* XXX is this right? (BP) */
   /* Install swsetup for tnl->Driver.Render.*:
    */
   _swsetup_Wakeup(ctx);

   fxSetupDDSpanPointers(ctx);
   fxDDUpdateDDPointers(ctx, ~0);
}


#else


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

extern int gl_fx_dummy_function_dd(void);
int
gl_fx_dummy_function_dd(void)
{
   return 0;
}

#endif /* FX */