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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
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 <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 */
110