src/gallium/drivers/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 #include "pipe/p_state.h"
  35 #include "tgsi/tgsi_exec.h"
  36
  37 #define PRIM_POINT 1
  38 #define PRIM_LINE  2
  39 #define PRIM_TRI   3
  40
  41
  42 /* The rasterizer generates 2x2 quads of fragment and feeds them to
  43  * the current fp_machine (see below).
  44  * Remember that Y=0=top with Y increasing down the window.
  45  */
  46 #define QUAD_TOP_LEFT     0
  47 #define QUAD_TOP_RIGHT    1
  48 #define QUAD_BOTTOM_LEFT  2
  49 #define QUAD_BOTTOM_RIGHT 3
  50
  51 #define MASK_TOP_LEFT     (1 << QUAD_TOP_LEFT)
  52 #define MASK_TOP_RIGHT    (1 << QUAD_TOP_RIGHT)
  53 #define MASK_BOTTOM_LEFT  (1 << QUAD_BOTTOM_LEFT)
  54 #define MASK_BOTTOM_RIGHT (1 << QUAD_BOTTOM_RIGHT)
  55 #define MASK_ALL          0xf
  56
  57
  58 /**
  59  * Encodes everything we need to know about a 2x2 pixel block.  Uses
  60  * "Channel-Serial" or "SoA" layout.
  61  */
  62 struct quad_header_input
  63 {
  64    int x0;
  65    int y0;
  66    float coverage[QUAD_SIZE];    /** fragment coverage for antialiasing */
  67    unsigned facing:1;   /**< Front (0) or back (1) facing? */
  68    unsigned prim:2;     /**< PRIM_POINT, LINE, TRI */
  69 };
  70
  71 struct quad_header_inout
  72 {
  73    unsigned mask:4;
  74 };
  75
  76 struct quad_header_output
  77 {
  78    /** colors in SOA format (rrrr, gggg, bbbb, aaaa) */
  79    float color[PIPE_MAX_COLOR_BUFS][NUM_CHANNELS][QUAD_SIZE];
  80    float depth[QUAD_SIZE];
  81 };
  82
  83 struct quad_header {
  84    struct quad_header_input input;
  85    struct quad_header_inout inout;
  86    struct quad_header_output output;
  87
  88    const struct tgsi_interp_coef *coef;
  89    const struct tgsi_interp_coef *posCoef;
  90
  91    unsigned nr_attrs;
  92 };
  93
  94 #endif /* SP_HEADERS_H */
  95