src/gallium/drivers/softpipe/sp_quad.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 VMware, Inc.
   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 VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
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  25  *
  26  **************************************************************************/
  27
  28 /* Authors:  Keith Whitwell <keithw@vmware.com>
  29  */
  30
  31 #ifndef SP_QUAD_H
  32 #define SP_QUAD_H
  33
  34 #include "pipe/p_state.h"
  35 #include "tgsi/tgsi_exec.h"
  36
  37
  38 #define QUAD_PRIM_POINT 1
  39 #define QUAD_PRIM_LINE  2
  40 #define QUAD_PRIM_TRI   3
  41
  42
  43 /* The rasterizer generates 2x2 quads of fragment and feeds them to
  44  * the current fp_machine (see below).
  45  * Remember that Y=0=top with Y increasing down the window.
  46  */
  47 #define QUAD_TOP_LEFT     0
  48 #define QUAD_TOP_RIGHT    1
  49 #define QUAD_BOTTOM_LEFT  2
  50 #define QUAD_BOTTOM_RIGHT 3
  51
  52 #define MASK_TOP_LEFT     (1 << QUAD_TOP_LEFT)
  53 #define MASK_TOP_RIGHT    (1 << QUAD_TOP_RIGHT)
  54 #define MASK_BOTTOM_LEFT  (1 << QUAD_BOTTOM_LEFT)
  55 #define MASK_BOTTOM_RIGHT (1 << QUAD_BOTTOM_RIGHT)
  56 #define MASK_ALL          0xf
  57
  58
  59 /**
  60  * Quad stage inputs (pos, coverage, front/back face, etc)
  61  */
  62 struct quad_header_input
  63 {
  64    int x0, y0;                /**< quad window pos, always even */
  65    unsigned layer;
  66    unsigned viewport_index;
  67    float coverage[TGSI_QUAD_SIZE]; /**< fragment coverage for antialiasing */
  68    unsigned facing:1;         /**< Front (0) or back (1) facing? */
  69    unsigned prim:2;           /**< QUAD_PRIM_POINT, LINE, TRI */
  70 };
  71
  72
  73 /**
  74  * Quad stage inputs/outputs.
  75  */
  76 struct quad_header_inout
  77 {
  78    unsigned mask:4;
  79 };
  80
  81
  82 /**
  83  * Quad stage outputs (color & depth).
  84  */
  85 struct quad_header_output
  86 {
  87    /** colors in SOA format (rrrr, gggg, bbbb, aaaa) */
  88    float color[PIPE_MAX_COLOR_BUFS][TGSI_NUM_CHANNELS][TGSI_QUAD_SIZE];
  89    float depth[TGSI_QUAD_SIZE];
  90    uint8_t stencil[TGSI_QUAD_SIZE];
  91 };
  92
  93
  94 /**
  95  * Encodes everything we need to know about a 2x2 pixel block.  Uses
  96  * "Channel-Serial" or "SoA" layout.
  97  */
  98 struct quad_header {
  99    struct quad_header_input input;
 100    struct quad_header_inout inout;
 101    struct quad_header_output output;
 102
 103    /* Redundant/duplicated:
 104     */
 105    const struct tgsi_interp_coef *posCoef;
 106    const struct tgsi_interp_coef *coef;
 107 };
 108
 109 #endif /* SP_QUAD_H */