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/* $Id: s_context.h,v 1.1 2003-02-28 11:49:41 pj Exp $ */
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/*
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 * Mesa 3-D graphics library
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 * Version:  4.1
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 *
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 * Copyright (C) 1999-2002  Brian Paul   All Rights Reserved.
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 *
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 * Permission is hereby granted, free of charge, to any person obtaining a
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 * copy of this software and associated documentation files (the "Software"),
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 * to deal in the Software without restriction, including without limitation
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 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
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 * and/or sell copies of the Software, and to permit persons to whom the
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 * Software is furnished to do so, subject to the following conditions:
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 *
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 * The above copyright notice and this permission notice shall be included
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 * in all copies or substantial portions of the Software.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
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 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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 *
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 * Authors:
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 *    Keith Whitwell <keith@tungstengraphics.com>
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 */
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/**
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 * \file swrast/s_context.h
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 * \brief fill in description
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 * \author Keith Whitwell <keith@tungstengraphics.com>
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 */
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#ifndef S_CONTEXT_H
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#define S_CONTEXT_H
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#include "mtypes.h"
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#include "swrast.h"
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/*
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 * For texture sampling:
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 */
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typedef void (*TextureSampleFunc)( GLcontext *ctx, GLuint texUnit,
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                                   const struct gl_texture_object *tObj,
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                                   GLuint n, GLfloat texcoords[][4],
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                                   const GLfloat lambda[], GLchan rgba[][4] );
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/*
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 * Blending function
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 */
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#ifdef USE_MMX_ASM
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typedef void (_ASMAPIP blend_func)( GLcontext *ctx, GLuint n,
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                                    const GLubyte mask[],
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                                    GLchan src[][4], CONST GLchan dst[][4] );
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#else
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typedef void (*blend_func)( GLcontext *ctx, GLuint n, const GLubyte mask[],
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                            GLchan src[][4], CONST GLchan dst[][4] );
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#endif
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typedef void (*swrast_point_func)( GLcontext *ctx, const SWvertex *);
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typedef void (*swrast_line_func)( GLcontext *ctx,
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                                  const SWvertex *, const SWvertex *);
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typedef void (*swrast_tri_func)( GLcontext *ctx, const SWvertex *,
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                                 const SWvertex *, const SWvertex *);
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/** \defgroup Bitmasks
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 * Bitmasks to indicate which rasterization options are enabled
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 * (RasterMask)
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 */
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/*@{*/
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#define ALPHATEST_BIT           0x001   /**< Alpha-test pixels */
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#define BLEND_BIT               0x002   /**< Blend pixels */
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#define DEPTH_BIT               0x004   /**< Depth-test pixels */
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#define FOG_BIT                 0x008   /**< Fog pixels */
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#define LOGIC_OP_BIT            0x010   /**< Apply logic op in software */
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#define CLIP_BIT                0x020   /**< Scissor or window clip pixels */
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#define STENCIL_BIT             0x040   /**< Stencil pixels */
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#define MASKING_BIT             0x080   /**< Do glColorMask or glIndexMask */
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#define ALPHABUF_BIT            0x100   /**< Using software alpha buffer */
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#define MULTI_DRAW_BIT          0x400   /**< Write to more than one color- */
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                                        /**< buffer or no buffers. */
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#define OCCLUSION_BIT           0x800   /**< GL_HP_occlusion_test enabled */
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#define TEXTURE_BIT             0x1000  /**< Texturing really enabled */
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/*@}*/
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#define _SWRAST_NEW_RASTERMASK (_NEW_BUFFERS|   \
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                                _NEW_SCISSOR|   \
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                                _NEW_COLOR|     \
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                                _NEW_DEPTH|     \
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                                _NEW_FOG|       \
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                                _NEW_STENCIL|   \
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                                _NEW_TEXTURE|   \
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                                _NEW_VIEWPORT|  \
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                                _NEW_DEPTH)
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/**
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 * \struct SWcontext
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 * \brief SWContext?
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 */
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typedef struct
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{
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   /** Driver interface:
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    */
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   struct swrast_device_driver Driver;
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   /** Configuration mechanisms to make software rasterizer match
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    * characteristics of the hardware rasterizer (if present):
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    */
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   GLboolean AllowVertexFog;
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   GLboolean AllowPixelFog;
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   /** Derived values, invalidated on statechanges, updated from
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    * _swrast_validate_derived():
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    */
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   GLuint _RasterMask;
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   GLfloat _MinMagThresh[MAX_TEXTURE_UNITS];
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   GLfloat _backface_sign;
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   GLboolean _PreferPixelFog;
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   GLboolean _AnyTextureCombine;
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   /* Accum buffer temporaries.
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    */
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   GLboolean _IntegerAccumMode; /**< Storing unscaled integers? */
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   GLfloat _IntegerAccumScaler; /**< Implicit scale factor */
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   /* Working values:
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    */
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   GLuint StippleCounter;    /**< Line stipple counter */
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   GLuint NewState;
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   GLuint StateChanges;
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   GLenum Primitive;    /* current primitive being drawn (ala glBegin) */
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   GLuint CurrentBuffer; /* exactly one of FRONT_LEFT_BIT, BACK_LEFT_BIT, etc*/
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   /** Mechanism to allow driver (like X11) to register further
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    * software rasterization routines.
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    */
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   /*@{*/
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   void (*choose_point)( GLcontext * );
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   void (*choose_line)( GLcontext * );
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   void (*choose_triangle)( GLcontext * );
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   GLuint invalidate_point;
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   GLuint invalidate_line;
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   GLuint invalidate_triangle;
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   /*@}*/
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   /** Function pointers for dispatch behind public entrypoints. */
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   /*@{*/
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   void (*InvalidateState)( GLcontext *ctx, GLuint new_state );
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   swrast_point_func Point;
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   swrast_line_func Line;
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   swrast_tri_func Triangle;
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   /*@}*/
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   /**
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    * Placeholders for when separate specular (or secondary color) is
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    * enabled but texturing is not.
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    */
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   /*@{*/
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   swrast_point_func SpecPoint;
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   swrast_line_func SpecLine;
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   swrast_tri_func SpecTriangle;
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   /*@}*/
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   /**
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    * Typically, we'll allocate a sw_span structure as a local variable
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    * and set its 'array' pointer to point to this object.  The reason is
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    * this object is big and causes problems when allocated on the stack
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    * on some systems.
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    */
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   struct span_arrays *SpanArrays;
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   /**
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    * Used to buffer N GL_POINTS, instead of rendering one by one.
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    */
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   struct sw_span PointSpan;
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   /** Internal hooks, kept uptodate by the same mechanism as above.
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    */
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   blend_func BlendFunc;
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   TextureSampleFunc TextureSample[MAX_TEXTURE_UNITS];
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   /** Buffer for saving the sampled texture colors.
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    * Needed for GL_ARB_texture_env_crossbar implementation.
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    */
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   GLchan *TexelBuffer;
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} SWcontext;
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extern void
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_swrast_validate_derived( GLcontext *ctx );
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#define SWRAST_CONTEXT(ctx) ((SWcontext *)ctx->swrast_context)
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#define RENDER_START(SWctx, GLctx)                      \
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   do {                                                 \
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      if ((SWctx)->Driver.SpanRenderStart) {            \
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         (*(SWctx)->Driver.SpanRenderStart)(GLctx);     \
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      }                                                 \
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   } while (0)
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#define RENDER_FINISH(SWctx, GLctx)                     \
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   do {                                                 \
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      if ((SWctx)->Driver.SpanRenderFinish) {           \
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         (*(SWctx)->Driver.SpanRenderFinish)(GLctx);    \
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      }                                                 \
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   } while (0)
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/*
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 * XXX these macros are just bandages for now in order to make
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 * CHAN_BITS==32 compile cleanly.
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 * These should probably go elsewhere at some point.
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 */
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#if CHAN_TYPE == GL_FLOAT
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#define ChanToFixed(X)  (X)
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#define FixedToChan(X)  (X)
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#else
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#define ChanToFixed(X)  IntToFixed(X)
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#define FixedToChan(X)  FixedToInt(X)
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#endif
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#endif