1 #ifndef _RRFRAGMENTPACKET_HPP
2 #define _RRFRAGMENTPACKET_HPP
3 /*-------------------------------------------------------------------------
4  * drawElements Quality Program Reference Renderer
5  * -----------------------------------------------
6  *
7  * Copyright 2014 The Android Open Source Project
8  *
9  * Licensed under the Apache License, Version 2.0 (the "License");
10  * you may not use this file except in compliance with the License.
11  * You may obtain a copy of the License at
12  *
13  *      http://www.apache.org/licenses/LICENSE-2.0
14  *
15  * Unless required by applicable law or agreed to in writing, software
16  * distributed under the License is distributed on an "AS IS" BASIS,
17  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
18  * See the License for the specific language governing permissions and
19  * limitations under the License.
20  *
21  *//*!
22  * \file
23  * \brief Fragment packet
24  *//*--------------------------------------------------------------------*/
25 
26 #include "rrDefs.hpp"
27 #include "rrGenericVector.hpp"
28 
29 namespace rr
30 {
31 
32 enum
33 {
34 	NUM_FRAGMENTS_PER_PACKET	= 4
35 };
36 
37 /*--------------------------------------------------------------------*//*!
38  * \brief Fragment packet
39  *
40  * Fragment packet contains inputs and outputs for fragment shading.
41  *
42  * Fragment shading is always done in 2x2 blocks in order to easily estimate
43  * derivates for mipmap-selection etc.
44  *
45  * Values packed in vectors (such as barycentrics) are in order:
46  *  (x0,y0), (x1,y0), (x0,y1), (x1,y1)
47  * OR:
48  *  ndx = y*2 + x
49  *//*--------------------------------------------------------------------*/
50 struct FragmentPacket
51 {
52 	tcu::IVec2		position;			//!< Position of (0,0) fragment.
53 	deUint64		coverage;			//!< Coverage mask.
54 	tcu::Vec4		barycentric[3];		//!< Perspective-correct barycentric values.
55 };
56 
57 } // rr
58 
59 #endif // _RRFRAGMENTPACKET_HPP
60