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 */
62struct 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 */
74struct quad_header_inout
75{
76   unsigned mask:4;
77};
78
79
80/**
81 * Quad stage outputs (color & depth).
82 */
83struct 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 */
96struct 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