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1  #ifndef _RRVERTEXPACKET_HPP
2  #define _RRVERTEXPACKET_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 Vertex packet and Vertex packet allocator
24   *//*--------------------------------------------------------------------*/
25  
26  #include "rrDefs.hpp"
27  #include "rrGenericVector.hpp"
28  #include "tcuVector.hpp"
29  
30  #include <vector>
31  
32  namespace rr
33  {
34  
35  class VertexPacketAllocator;
36  
37  /*--------------------------------------------------------------------*//*!
38   * \brief Vertex packet
39   *
40   * Vertex packet contains inputs and outputs for vertex shading.
41   *
42   * Inputs consist of per-vertex vertex and instance indices. Attribute
43   * list that can be accessed using those indices is provided as separate
44   * pointer for VS.
45   *
46   * Outputs include position, optional point size, and list of generic
47   * outputs that shader can write to. Number of VS outputs is specified
48   * in ProgramInfo.
49   *
50   * VertexPacket instance must be created by VertexPacketAllocator as
51   * outputs must be allocated memory after the instance.
52   *//*--------------------------------------------------------------------*/
53  struct VertexPacket
54  {
55  	// Inputs.
56  	int				instanceNdx;	//!< Instance index.
57  	int				vertexNdx;		//!< Vertex index.
58  
59  	// Outputs.
60  	tcu::Vec4		position;		//!< Transformed position - must be written always.
61  	float			pointSize;		//!< Point size, required when rendering points.
62  	int				primitiveID;	//!< Geometry shader output
63  
64  	GenericVec4		outputs[1];		//!< Generic vertex shader outputs - passed to subsequent shader stages. Array length is the number of outputs.
65  	// --- DO NOT ADD ANY MEMBER VARIABLES AFTER OUTPUTS, OUTPUTS IS VARIABLE-SIZED --- //
66  
67  private:
68  	// Allow creation and destruction only for Allocator
69  					VertexPacket	(void);
70  					VertexPacket	(const VertexPacket&);  // disabled, non-copyable
71  					~VertexPacket	(void);
72  
73  	// Assignment cannot work without knowing the output array length => prevent assignment
74  	VertexPacket&	operator=		(const VertexPacket&);  // disabled, non-copyable
75  
76  
77  	friend class VertexPacketAllocator;
78  } DE_WARN_UNUSED_TYPE;
79  
80  
81  /*--------------------------------------------------------------------*//*!
82   * \brief Vertex packet allocator
83   *
84   * Allocates vertex packets.
85   *
86   * Vertex packet must have enough space allocated for its outputs.
87   *
88   * All memory allocated for vertex packets is released when VertexPacketAllocator
89   * is destroyed. Allocated vertex packets should not be accessed after
90   * allocator is destroyed.
91   *
92   * alloc and allocArray will throw bad_alloc if allocation fails.
93   *//*--------------------------------------------------------------------*/
94  class VertexPacketAllocator
95  {
96  public:
97  								VertexPacketAllocator	(const size_t numberOfVertexOutputs);
98  								~VertexPacketAllocator	(void);
99  
100  	std::vector<VertexPacket*>	allocArray				(size_t count); // throws bad_alloc
101  	VertexPacket*				alloc					(void);			// throws bad_alloc
102  
getNumVertexOutputs(void) const103  	inline size_t				getNumVertexOutputs		(void) const	{ return m_numberOfVertexOutputs; }
104  
105  private:
106  								VertexPacketAllocator	(const VertexPacketAllocator&); // disabled, non-copyable
107  	VertexPacketAllocator&		operator=				(const VertexPacketAllocator&); // disabled, non-copyable
108  
109  	const size_t				m_numberOfVertexOutputs;
110  	std::vector<deInt8*>		m_allocations;
111  	std::vector<VertexPacket*>	m_singleAllocPool;
112  } DE_WARN_UNUSED_TYPE;
113  
114  } // rr
115  
116  #endif // _RRVERTEXPACKET_HPP
117