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/* $Id: s_context.h,v 1.1 2003-02-28 11:49:41 pj Exp $ */

/*

 * Mesa 3-D graphics library

 * Version:  4.1

 *

 * Copyright (C) 1999-2002  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.

 *

 * Authors:

 *    Keith Whitwell <keith@tungstengraphics.com>

 */

/**

 * \file swrast/s_context.h

 * \brief fill in description

 * \author Keith Whitwell <keith@tungstengraphics.com>

 */

#ifndef S_CONTEXT_H

#define S_CONTEXT_H

#include "mtypes.h"

#include "swrast.h"

/*

 * For texture sampling:

 */

typedef void (*TextureSampleFunc)( GLcontext *ctx, GLuint texUnit,

                                   const struct gl_texture_object *tObj,

                                   GLuint n, GLfloat texcoords[][4],

                                   const GLfloat lambda[], GLchan rgba[][4] );

/*

 * Blending function

 */

#ifdef USE_MMX_ASM

typedef void (_ASMAPIP blend_func)( GLcontext *ctx, GLuint n,

                                    const GLubyte mask[],

                                    GLchan src[][4], CONST GLchan dst[][4] );

#else

typedef void (*blend_func)( GLcontext *ctx, GLuint n, const GLubyte mask[],

                            GLchan src[][4], CONST GLchan dst[][4] );

#endif

typedef void (*swrast_point_func)( GLcontext *ctx, const SWvertex *);

typedef void (*swrast_line_func)( GLcontext *ctx,

                                  const SWvertex *, const SWvertex *);

typedef void (*swrast_tri_func)( GLcontext *ctx, const SWvertex *,

                                 const SWvertex *, const SWvertex *);

/** \defgroup Bitmasks

 * Bitmasks to indicate which rasterization options are enabled

 * (RasterMask)

 */

/*@{*/

#define ALPHATEST_BIT           0x001   /**< Alpha-test pixels */

#define BLEND_BIT               0x002   /**< Blend pixels */

#define DEPTH_BIT               0x004   /**< Depth-test pixels */

#define FOG_BIT                 0x008   /**< Fog pixels */

#define LOGIC_OP_BIT            0x010   /**< Apply logic op in software */

#define CLIP_BIT                0x020   /**< Scissor or window clip pixels */

#define STENCIL_BIT             0x040   /**< Stencil pixels */

#define MASKING_BIT             0x080   /**< Do glColorMask or glIndexMask */

#define ALPHABUF_BIT            0x100   /**< Using software alpha buffer */

#define MULTI_DRAW_BIT          0x400   /**< Write to more than one color- */

                                        /**< buffer or no buffers. */

#define OCCLUSION_BIT           0x800   /**< GL_HP_occlusion_test enabled */

#define TEXTURE_BIT             0x1000  /**< Texturing really enabled */

/*@}*/

#define _SWRAST_NEW_RASTERMASK (_NEW_BUFFERS|   \

                                _NEW_SCISSOR|   \

                                _NEW_COLOR|     \

                                _NEW_DEPTH|     \

                                _NEW_FOG|       \

                                _NEW_STENCIL|   \

                                _NEW_TEXTURE|   \

                                _NEW_VIEWPORT|  \

                                _NEW_DEPTH)

/**

 * \struct SWcontext

 * \brief SWContext?

 */

typedef struct

{

   /** Driver interface:

    */

   struct swrast_device_driver Driver;

   /** Configuration mechanisms to make software rasterizer match

    * characteristics of the hardware rasterizer (if present):

    */

   GLboolean AllowVertexFog;

   GLboolean AllowPixelFog;

   /** Derived values, invalidated on statechanges, updated from

    * _swrast_validate_derived():

    */

   GLuint _RasterMask;

   GLfloat _MinMagThresh[MAX_TEXTURE_UNITS];

   GLfloat _backface_sign;

   GLboolean _PreferPixelFog;

   GLboolean _AnyTextureCombine;

   /* Accum buffer temporaries.

    */

   GLboolean _IntegerAccumMode; /**< Storing unscaled integers? */

   GLfloat _IntegerAccumScaler; /**< Implicit scale factor */

   /* Working values:

    */

   GLuint StippleCounter;    /**< Line stipple counter */

   GLuint NewState;

   GLuint StateChanges;

   GLenum Primitive;    /* current primitive being drawn (ala glBegin) */

   GLuint CurrentBuffer; /* exactly one of FRONT_LEFT_BIT, BACK_LEFT_BIT, etc*/

   /** Mechanism to allow driver (like X11) to register further

    * software rasterization routines.

    */

   /*@{*/

   void (*choose_point)( GLcontext * );

   void (*choose_line)( GLcontext * );

   void (*choose_triangle)( GLcontext * );

   GLuint invalidate_point;

   GLuint invalidate_line;

   GLuint invalidate_triangle;

   /*@}*/

   /** Function pointers for dispatch behind public entrypoints. */

   /*@{*/

   void (*InvalidateState)( GLcontext *ctx, GLuint new_state );

   swrast_point_func Point;

   swrast_line_func Line;

   swrast_tri_func Triangle;

   /*@}*/

   /**

    * Placeholders for when separate specular (or secondary color) is

    * enabled but texturing is not.

    */

   /*@{*/

   swrast_point_func SpecPoint;

   swrast_line_func SpecLine;

   swrast_tri_func SpecTriangle;

   /*@}*/

   /**

    * Typically, we'll allocate a sw_span structure as a local variable

    * and set its 'array' pointer to point to this object.  The reason is

    * this object is big and causes problems when allocated on the stack

    * on some systems.

    */

   struct span_arrays *SpanArrays;

   /**

    * Used to buffer N GL_POINTS, instead of rendering one by one.

    */

   struct sw_span PointSpan;

   /** Internal hooks, kept uptodate by the same mechanism as above.

    */

   blend_func BlendFunc;

   TextureSampleFunc TextureSample[MAX_TEXTURE_UNITS];

   /** Buffer for saving the sampled texture colors.

    * Needed for GL_ARB_texture_env_crossbar implementation.

    */

   GLchan *TexelBuffer;

} SWcontext;

extern void

_swrast_validate_derived( GLcontext *ctx );

#define SWRAST_CONTEXT(ctx) ((SWcontext *)ctx->swrast_context)

#define RENDER_START(SWctx, GLctx)                      \

   do {                                                 \

      if ((SWctx)->Driver.SpanRenderStart) {            \

         (*(SWctx)->Driver.SpanRenderStart)(GLctx);     \

      }                                                 \

   } while (0)

#define RENDER_FINISH(SWctx, GLctx)                     \

   do {                                                 \

      if ((SWctx)->Driver.SpanRenderFinish) {           \

         (*(SWctx)->Driver.SpanRenderFinish)(GLctx);    \

      }                                                 \

   } while (0)

/*

 * XXX these macros are just bandages for now in order to make

 * CHAN_BITS==32 compile cleanly.

 * These should probably go elsewhere at some point.

 */

#if CHAN_TYPE == GL_FLOAT

#define ChanToFixed(X)  (X)

#define FixedToChan(X)  (X)

#else

#define ChanToFixed(X)  IntToFixed(X)

#define FixedToChan(X)  FixedToInt(X)

#endif

#endif