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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 
    103 	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