src/mesa/pipe/softpipe/sp_headers.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 /* Authors:  Keith Whitwell <keith@tungstengraphics.com>
  29  */
  30
  31 #ifndef SP_HEADERS_H
  32 #define SP_HEADERS_H
  33
  34
  35 #define PRIM_POINT 1
  36 #define PRIM_LINE  2
  37 #define PRIM_TRI   3
  38
  39
  40 /* The rasterizer generates 2x2 quads of fragment and feeds them to
  41  * the current fp_machine (see below).
  42  */
  43 #define QUAD_BOTTOM_LEFT  0
  44 #define QUAD_BOTTOM_RIGHT 1
  45 #define QUAD_TOP_LEFT     2
  46 #define QUAD_TOP_RIGHT    3
  47 #define QUAD_SIZE        (2*2)
  48
  49 #define MASK_BOTTOM_LEFT  0x1
  50 #define MASK_BOTTOM_RIGHT 0x2
  51 #define MASK_TOP_LEFT     0x4
  52 #define MASK_TOP_RIGHT    0x8
  53 #define MASK_ALL          0xf
  54
  55
  56 #define NUM_CHANNELS   4        /* avoid confusion between 4 pixels and 4 channels */
  57
  58
  59 struct setup_coefficient {
  60    GLfloat a0[NUM_CHANNELS];    /* in an xyzw layout */
  61    GLfloat dadx[NUM_CHANNELS];
  62    GLfloat dady[NUM_CHANNELS];
  63 };
  64
  65
  66
  67 /**
  68  * Encodes everything we need to know about a 2x2 pixel block.  Uses
  69  * "Channel-Serial" or "SoA" layout.
  70  */
  71 struct quad_header {
  72    GLint x0;
  73    GLint y0;
  74    GLuint mask:4;
  75    GLuint facing:1;   /**< Front (0) or back (1) facing? */
  76    GLuint prim:2;     /**< PRIM_POINT, LINE, TRI */
  77
  78    struct {
  79       GLfloat color[4][QUAD_SIZE];      /* rrrr, gggg, bbbb, aaaa */
  80       GLfloat depth[QUAD_SIZE];
  81    } outputs;
  82
  83    GLfloat coverage[QUAD_SIZE];    /** fragment coverage for antialiasing */
  84
  85    const struct setup_coefficient *coef;
  86
  87    const enum interp_mode *interp; /* XXX: this information should be
  88                                     * encoded in fragment program DECL
  89                                     * statements. */
  90
  91    GLuint nr_attrs;
  92 };
  93
  94
  95 #endif /* SP_HEADERS_H */