125 lines
5.1 KiB
C++
125 lines
5.1 KiB
C++
//
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// KRTextureManager.cpp
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// KREngine
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//
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// Copyright 2012 Kearwood Gilbert. All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification, are
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// permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this list of
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// conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
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// of conditions and the following disclaimer in the documentation and/or other materials
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// provided with the distribution.
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//
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// THIS SOFTWARE IS PROVIDED BY KEARWOOD GILBERT ''AS IS'' AND ANY EXPRESS OR IMPLIED
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// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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// FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL KEARWOOD GILBERT OR
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// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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// ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// The views and conclusions contained in the software and documentation are those of the
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// authors and should not be interpreted as representing official policies, either expressed
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// or implied, of Kearwood Gilbert.
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//
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#include "KRTextureManager.h"
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#include "KRContext.h"
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#include <string.h>
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KRTextureManager::KRTextureManager(KRContext &context) : KRContextObject(context) {
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m_textureMemUsed = 0;
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for(int iTexture=0; iTexture<KRENGINE_MAX_TEXTURE_UNITS; iTexture++) {
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m_activeTextures[iTexture] = NULL;
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}
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}
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KRTextureManager::~KRTextureManager() {
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for(map<std::string, KRTexture *>::iterator itr = m_textures.begin(); itr != m_textures.end(); ++itr){
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delete (*itr).second;
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}
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}
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#if TARGET_OS_IPHONE
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KRTexture *KRTextureManager::loadTexture(const char *szName, KRDataBlock *data) {
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KRTexture *pTexture = new KRTexture(data, this);
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std::string lowerName = szName;
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std::transform(lowerName.begin(), lowerName.end(),
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lowerName.begin(), ::tolower);
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m_textures[lowerName] = pTexture;
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return pTexture;
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}
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#endif
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KRTexture *KRTextureManager::getTexture(const char *szName) {
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std::string lowerName = szName;
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std::transform(lowerName.begin(), lowerName.end(),
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lowerName.begin(), ::tolower);
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map<std::string, KRTexture *>::iterator itr = m_textures.find(lowerName);
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if(itr == m_textures.end()) {
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// Not found
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return NULL;
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} else {
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return (*itr).second;
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}
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}
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void KRTextureManager::selectTexture(int iTextureUnit, KRTexture *pTexture) {
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if(m_activeTextures[iTextureUnit] != pTexture) {
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glActiveTexture(GL_TEXTURE0 + iTextureUnit);
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if(pTexture != NULL) {
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m_textureCache.erase(pTexture); // Ensure that the texture will not be deleted while it is bound to a texture unit, and return it to the top of the texture cache when it is released
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glBindTexture(GL_TEXTURE_2D, pTexture->getHandle(m_textureMemUsed));
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// TODO - These texture parameters should be assigned by the material or texture parameters
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, 1.0f);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
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} else {
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glBindTexture(GL_TEXTURE_2D, 0);
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}
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if(m_activeTextures[iTextureUnit] != NULL) {
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KRTexture *unloadedTexture = m_activeTextures[iTextureUnit];
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m_activeTextures[iTextureUnit] = NULL;
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bool bActive = false;
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for(int iTexture=0; iTexture < KRENGINE_MAX_TEXTURE_UNITS; iTexture++) {
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if(m_activeTextures[iTexture] == unloadedTexture) {
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bActive = true;
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}
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}
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if(!bActive) {
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// Only return a texture to the cache when the last texture unit referencing it is re-assigned to a different texture
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if(m_textureCache.find(unloadedTexture) == m_textureCache.end()) {
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m_textureCache.insert(unloadedTexture);
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while(m_textureCache.size() > KRENGINE_MAX_TEXTURE_HANDLES || m_textureMemUsed > KRENGINE_MAX_TEXTURE_MEM) {
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// Keep texture size within limits
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KRTexture *droppedTexture = (*m_textureCache.begin());
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droppedTexture->releaseHandle(m_textureMemUsed);
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m_textureCache.erase(droppedTexture);
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fprintf(stderr, "Texture Swapping...\n");
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}
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}
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}
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}
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m_activeTextures[iTextureUnit] = pTexture;
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}
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}
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long KRTextureManager::getMemUsed() {
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return m_textureMemUsed;
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}
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