mirror of
https://github.com/RetroDECK/Supermodel.git
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337 lines
8.9 KiB
C++
337 lines
8.9 KiB
C++
/**
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** Supermodel
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** A Sega Model 3 Arcade Emulator.
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** Copyright 2011 Bart Trzynadlowski, Nik Henson
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**
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** This file is part of Supermodel.
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**
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** Supermodel is free software: you can redistribute it and/or modify it under
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** the terms of the GNU General Public License as published by the Free
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** Software Foundation, either version 3 of the License, or (at your option)
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** any later version.
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**
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** Supermodel is distributed in the hope that it will be useful, but WITHOUT
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** ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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** FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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** more details.
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**
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** You should have received a copy of the GNU General Public License along
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** with Supermodel. If not, see <http://www.gnu.org/licenses/>.
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**/
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/*
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* CTextureRefs.cpp
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*
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* Class that tracks unique texture references, eg in a cached model.
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*
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* Texture references are stored internally as a 27-bit field (3 bits for format, 6 bits each for x, y, width & height) to save space.
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*
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* A pre-allocated array is used for storing up to TEXREFS_ARRAY_SIZE texture references. When that limit is exceeded, it switches
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* to using a hashset to store the texture references, but this requires extra memory allocation.
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*/
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#include "TextureRefs.h"
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#include "Supermodel.h"
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#include "Legacy3D.h"
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namespace Legacy3D {
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CTextureRefs::CTextureRefs() : m_size(0), m_hashCapacity(0), m_hashEntries(NULL)
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{
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//
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}
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CTextureRefs::~CTextureRefs()
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{
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DeleteAllHashEntries();
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}
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unsigned CTextureRefs::GetSize() const
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{
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return m_size;
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}
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void CTextureRefs::Clear()
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{
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// Delete all hash entries
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DeleteAllHashEntries();
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m_size = 0;
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m_hashCapacity = 0;
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m_hashEntries = NULL;
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}
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bool CTextureRefs::ContainsRef(unsigned fmt, unsigned x, unsigned y, unsigned width, unsigned height)
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{
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// Pack texture reference into bitfield
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unsigned texRef = (fmt&7)<<24|(x&0x7E0)<<13|(y&0x7E0)<<7|(width&0x7E0)<<1|(height&0x7E0)>>5;
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// Check if using array or hashset
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if (m_size <= TEXREFS_ARRAY_SIZE)
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{
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// See if texture reference held in array
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for (unsigned i = 0; i < m_size; i++)
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{
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if (texRef == m_array[i])
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return true;
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}
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return false;
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}
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else
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// See if texture reference held in hashset
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return HashContains(texRef);
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}
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bool CTextureRefs::AddRef(unsigned fmt, unsigned x, unsigned y, unsigned width, unsigned height)
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{
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// Pack texture reference into bitfield
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unsigned texRef = (fmt&7)<<24|(x&0x7E0)<<13|(y&0x7E0)<<7|(width&0x7E0)<<1|(height&0x7E0)>>5;
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// Check if using array or hashset
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if (m_size <= TEXREFS_ARRAY_SIZE)
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{
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// See if already held in array, if so nothing to do
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for (unsigned i = 0; i < m_size; i++)
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{
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if (texRef == m_array[i])
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return true;
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}
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// If not, check if array is full
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if (m_size == TEXREFS_ARRAY_SIZE)
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{
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// If so, set initial hashset capacity to 47 to initialize it
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UpdateHashCapacity(47);
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// Copy array into hashset
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for (unsigned i = 0; i < TEXREFS_ARRAY_SIZE; i++)
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AddToHash(m_array[i]);
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// Add texture reference to hashset
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AddToHash(texRef);
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}
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else
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{
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// Add texture reference to array
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m_array[m_size] = texRef;
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m_size++;
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}
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return true;
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}
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else
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// Add texture reference to hashset
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return AddToHash(texRef);
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}
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bool CTextureRefs::RemoveRef(unsigned fmt, unsigned x, unsigned y, unsigned width, unsigned height)
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{
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// Pack texture reference into bitfield
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unsigned texRef = (fmt&7)<<24|(x&0x7E0)<<13|(y&0x7E0)<<7|(width&0x7E0)<<1|(height&0x7E0)>>5;
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// Check if using array or hashset
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if (m_size <= TEXREFS_ARRAY_SIZE)
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{
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for (unsigned i = 0; i < m_size; i++)
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{
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if (texRef == m_array[i])
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{
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for (unsigned j = i + 1; j < m_size; j++)
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m_array[j - 1] = m_array[j];
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m_size--;
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return true;
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}
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}
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return false;
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}
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else
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{
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// Remove texture reference from hashset
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bool removed = RemoveFromHash(texRef);
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// See if should switch back to array
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if (m_size == TEXREFS_ARRAY_SIZE)
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{
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// Loop through all hash entries and copy texture references into array
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unsigned j = 0;
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for (unsigned i = 0; i < m_hashCapacity; i++)
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{
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for (HashEntry *entry = m_hashEntries[i]; entry; entry = entry->nextEntry)
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m_array[j++] = entry->texRef;
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}
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// Delete all hash entries
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DeleteAllHashEntries();
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}
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return removed;
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}
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}
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void CTextureRefs::DecodeAllTextures(CLegacy3D *Render3D)
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{
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// Check if using array or hashset
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if (m_size <= TEXREFS_ARRAY_SIZE)
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{
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// Loop through elements in array and call CLegacy3D::DecodeTexture
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for (unsigned i = 0; i < m_size; i++)
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{
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// Unpack texture reference from bitfield
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unsigned texRef = m_array[i];
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unsigned fmt = texRef>>24;
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unsigned x = (texRef>>13)&0x7E0;
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unsigned y = (texRef>>7)&0x7E0;
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unsigned width = (texRef>>1)&0x7E0;
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unsigned height = (texRef<<5)&0x7E0;
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Render3D->DecodeTexture(fmt, x, y, width, height);
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}
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}
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else
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{
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// Loop through all hash entriesa and call CLegacy3D::DecodeTexture
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for (unsigned i = 0; i < m_hashCapacity; i++)
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{
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for (HashEntry *entry = m_hashEntries[i]; entry; entry = entry->nextEntry)
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{
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// Unpack texture reference from bitfield
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unsigned texRef = entry->texRef;
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unsigned fmt = texRef>>24;
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unsigned x = (texRef>>13)&0x7E0;
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unsigned y = (texRef>>7)&0x7E0;
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unsigned width = (texRef>>1)&0x7E0;
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unsigned height = (texRef<<5)&0x7E0;
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Render3D->DecodeTexture(fmt, x, y, width, height);
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}
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}
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}
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}
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bool CTextureRefs::UpdateHashCapacity(unsigned capacity)
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{
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unsigned oldCapacity = m_hashCapacity;
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HashEntry **oldEntries = m_hashEntries;
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// Update capacity and create new empty entries array
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m_hashCapacity = capacity;
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m_hashEntries = new(std::nothrow) HashEntry*[capacity];
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if (!m_hashEntries)
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return false;
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memset(m_hashEntries, 0, capacity * sizeof(HashEntry*));
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if (oldEntries)
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{
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// Redistribute entries into new entries array
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for (unsigned i = 0; i < oldCapacity; i++)
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{
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HashEntry *entry = oldEntries[i];
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while (entry)
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{
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HashEntry *nextEntry = entry->nextEntry;
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unsigned hash = entry->texRef % capacity;
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entry->nextEntry = m_hashEntries[hash];
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m_hashEntries[hash] = entry;
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entry = nextEntry;
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}
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}
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// Delete old entries array
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delete[] oldEntries;
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}
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return true;
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}
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HashEntry *CTextureRefs::CreateHashEntry(unsigned texRef, bool &hashCapacityUpdated)
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{
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// Update size and increase hash capacity if required
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m_size++;
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hashCapacityUpdated = m_size >= m_hashCapacity;
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if (hashCapacityUpdated)
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{
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if (m_hashCapacity < 89)
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UpdateHashCapacity(89); // Capacity of 89 gives good sequence of mostly prime capacities (89, 179, 359, 719, 1439, 2879 etc)
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else
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UpdateHashCapacity(2 * m_hashCapacity + 1);
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}
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return new(std::nothrow) HashEntry(texRef);
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}
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void CTextureRefs::DeleteHashEntry(HashEntry *entry)
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{
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// Update size and delete hash entry
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m_size--;
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delete entry;
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}
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void CTextureRefs::DeleteAllHashEntries()
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{
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if (!m_hashEntries)
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return;
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// Delete all hash entries and their storage
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for (unsigned i = 0; i < m_hashCapacity; i++)
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{
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HashEntry *entry = m_hashEntries[i];
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if (entry)
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delete entry;
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}
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delete[] m_hashEntries;
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}
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bool CTextureRefs::AddToHash(unsigned texRef)
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{
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// Convert texture reference to hash value
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unsigned hash = texRef % m_hashCapacity;
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// Loop through linked list for hash value and see if have texture reference already
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HashEntry *headEntry = m_hashEntries[hash];
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HashEntry *entry = headEntry;
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while (entry && texRef != entry->texRef)
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entry = entry->nextEntry;
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// If found, nothing to do
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if (entry)
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return true;
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// Otherwise, create new hash entry for texture reference
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bool hashCapacityUpdated;
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entry = CreateHashEntry(texRef, hashCapacityUpdated);
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// If couldn't create entry (ie out of memory), let caller know
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if (!entry)
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return false;
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if (hashCapacityUpdated)
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{
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// If hash capacity was increased recalculate hash value
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hash = texRef % m_hashCapacity;
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headEntry = m_hashEntries[hash];
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}
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// Store hash entry in linked list for hash value
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entry->nextEntry = headEntry;
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m_hashEntries[hash] = entry;
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return true;
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}
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bool CTextureRefs::RemoveFromHash(unsigned texRef)
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{
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// Convert texture reference to hash value
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unsigned hash = texRef % m_hashCapacity;
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// Loop through linked list for hash value and see if have texture reference
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HashEntry *entry = m_hashEntries[hash];
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HashEntry *prevEntry = NULL;
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while (entry && texRef != entry->texRef)
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{
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prevEntry = entry;
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entry = entry->nextEntry;
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}
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// If not found, nothing to do
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if (!entry)
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return false;
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// Otherwise, remove entry from linked list for hash value
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if (prevEntry)
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prevEntry->nextEntry = entry->nextEntry;
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else
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m_hashEntries[hash] = entry->nextEntry;
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// Delete hash entry storage
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DeleteHashEntry(entry);
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return true;
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}
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bool CTextureRefs::HashContains(unsigned texRef) const
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{
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// Convert texture reference to hash value
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unsigned hash = texRef % m_hashCapacity;
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// Loop through linked list for hash value and see if have texture reference
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HashEntry *entry = m_hashEntries[hash];
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while (entry && texRef != entry->texRef)
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entry = entry->nextEntry;
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return !!entry;
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}
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} // Legacy3D
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