workbench/libs/mesa/src/gallium/drivers/softpipe/sp_quad.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_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    float coverage[QUAD_SIZE]; /**< fragment coverage for antialiasing */
  66    unsigned facing:1;         /**< Front (0) or back (1) facing? */
  67    unsigned prim:2;           /**< QUAD_PRIM_POINT, LINE, TRI */
  68 };
  69
  70
  71 /**
  72  * Quad stage inputs/outputs.
  73  */
  74 struct quad_header_inout
  75 {
  76    unsigned mask:4;
  77 };
  78
  79
  80 /**
  81  * Quad stage outputs (color & depth).
  82  */
  83 struct quad_header_output
  84 {
  85    /** colors in SOA format (rrrr, gggg, bbbb, aaaa) */
  86    float color[PIPE_MAX_COLOR_BUFS][NUM_CHANNELS][QUAD_SIZE];
  87    float depth[QUAD_SIZE];
  88    uint8_t stencil[QUAD_SIZE];
  89 };
  90
  91
  92 /**
  93  * Encodes everything we need to know about a 2x2 pixel block.  Uses
  94  * "Channel-Serial" or "SoA" layout.
  95  */
  96 struct quad_header {
  97    struct quad_header_input input;
  98    struct quad_header_inout inout;
  99    struct quad_header_output output;
 100
 101    /* Redundant/duplicated:
 102     */
 103    const struct tgsi_interp_coef *posCoef;
 104    const struct tgsi_interp_coef *coef;
 105 };
 106
 107 #endif /* SP_QUAD_H */