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      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 (at) 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[TGSI_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][TGSI_NUM_CHANNELS][TGSI_QUAD_SIZE];
     87    float depth[TGSI_QUAD_SIZE];
     88    uint8_t stencil[TGSI_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 */
    108