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LibN2L N2L Home Older News Downloads Documentation (n2l5) Class Hierarchy Compound List File List n2l:: Members Functions Whole n2l:: Ref Documentation (libN2L-4) Class Hierarchy Compound List File List n2l:: Members Functions Whole n2l:: Ref Bugtracker Project Page Report a Bug Bug List Related Things Life 2130 Devel Game Journal

LibN2L-4 Library Code Reference Classes Compounds Files Members Method Index Full Reference cGLTexture.cpp Go to the documentation of this file. /************************************************************************ Nova-2 Library (libN2L, or simply n2l) Game development C++ Library Copyright (C) 2002 Aaron Cameron This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA A copy of the GNU Lesser General Public License has been provided with this library in the file 'COPYING'. Contact information for the author of this library has been provided with this library in the file 'AUTHOR'. ************************************************************************/ #include "cGLTexture.h" #include "n2l/vfs.h" #include "n2l/video.h" #include <GL/glu.h> #include <GL/gl.h> #include <iostream> using namespace std; namespace n2l { tBool cGLTexture::smRequiresRefreshable = true; /**************************************************************************/ cGLTexture::cGLTexture( const GLenum &iFormat, const tVector2u &iSize ) : mGLName(0), mHasAlpha(true), // Assume, like an idiot. mRefreshable(false), mSurface(0), mRawData(0) { glGenTextures(1,&mGLName); const tUint UnpackedDataSize = iSize.x()*iSize.y()*4; mRawData = new tUint8[ UnpackedDataSize ]; mRefreshable = true; bind(); glTexImage2D( GL_TEXTURE_2D, 0, 4, iSize.x(),iSize.y(), 0, GL_RGBA, GL_UNSIGNED_BYTE, mRawData ); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER,GL_LINEAR); // glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE ); // glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE ); } /**************************************************************************/ cGLTexture::cGLTexture( const cSurfaceInterface &iSurface ) : mGLName(0), mRefreshable(false), mRawData(0) { mSurface = new cSurface; mSurface->create( iSurface.properties().size().x(), iSurface.properties().size().y(), iSurface.format().bitsPerPixel(), iSurface.format().channelMask(cPixelFormat::Channel_Red), iSurface.format().channelMask(cPixelFormat::Channel_Green), iSurface.format().channelMask(cPixelFormat::Channel_Blue), iSurface.format().channelMask(cPixelFormat::Channel_Alpha) ); mSurface->literalCopyBlit( tVector2s(0,0), iSurface ); mRefreshable = true; readRawFromSurface(*mSurface); regenTexture(); } /**************************************************************************/ cGLTexture::cGLTexture( const cVfsNodeInterface &iFile ) : mGLName(0), mRefreshable(false), mRawData(0) { if (!iFile.likeFile()) throw cBadDataUseException( "cGLTexture::cGLTexture", tString("Node isn\'t like a file: ") + iFile.name() ); mSurface = new cSurface; mSurface->load(iFile); mRefreshable = true; readRawFromSurface(*mSurface); regenTexture(); } /**************************************************************************/ const tBool cGLTexture::hasAlpha() const { return mHasAlpha; } /**************************************************************************/ cGLTexture::~cGLTexture() { // We'll delete the texture here tGLTextureName temp[1]; temp[0] = mGLName; glDeleteTextures( 1,temp ); if (mSurface) delete mSurface; if (mRawData) delete [](tUint8*)(mRawData); } /**************************************************************************/ const tVector2u & cGLTexture::size() const { return mSize; } /**************************************************************************/ void cGLTexture::bindTexture2D() const { glBindTexture(GL_TEXTURE_2D,mGLName); //cout << "Binding Tex name: " << mGLName << endl; } /**************************************************************************/ const tUint cGLTexture::bitsForFormat( const GLenum &iFormat ) { switch (iFormat) { case GL_ALPHA4: return 4; case GL_ALPHA8: return 8; case GL_ALPHA12: return 12; case GL_ALPHA16: return 16; case GL_LUMINANCE4: return 4; case GL_LUMINANCE8: return 8; case GL_LUMINANCE12: return 12; case GL_LUMINANCE16: return 16; case GL_LUMINANCE4_ALPHA4: return 8; case GL_LUMINANCE6_ALPHA2: return 8; case GL_LUMINANCE8_ALPHA8: return 16; case GL_LUMINANCE12_ALPHA4: return 16; case GL_LUMINANCE16_ALPHA16: return 32; case GL_INTENSITY4: return 4; case GL_INTENSITY8: return 8; case GL_INTENSITY12: return 12; case GL_INTENSITY16: return 16; case GL_R3_G3_B2: return 8; case GL_RGB4: return 12; case GL_RGB5: return 15; case GL_RGB8: return 24; case GL_RGB10: return 30; case GL_RGB12: return 36; case GL_RGB16: return 48; case GL_RGBA2: return 8; case GL_RGBA4: return 16; case GL_RGB5_A1: return 16; case GL_RGBA8: return 32; case GL_RGB10_A2: return 32; case GL_RGBA12: return 48; case GL_RGBA16: return 64; default: break; } throw cOutOfBoundsException( "cGLTexture::bitsForFormat", "Format provided is not known", asString(tUint(iFormat)) ); } /**************************************************************************/ void cGLTexture::refresh() const { if (smRequiresRefreshable && !mRefreshable) throw cUnsupportedMethodException( "cGLTexture::refresh", "Called refresh on a texture which doesn\'t support it." ); // Delete the old texture (do I have to do this?) tGLTextureName temp[1]; temp[0] = mGLName; glDeleteTextures( 1,temp ); // re-read the texture. readRawFromSurface( *mSurface ); regenTexture(); } /**************************************************************************/ void cGLTexture::readRawFromSurface( const cSurfaceInterface &iSurface ) const { cSurface tempSurface; // Does this have an alpha surface? mHasAlpha = (0!=iSurface.format().channelMask( cPixelFormat::Channel_Alpha)); // Make sure the surface in question is the proper dimentions, // xSize and ySize are both ^2 tUint nWidth, nHeight; tUint nWidthPow, nHeightPow; isTwoToThe(iSurface.properties().size().x(),nWidthPow); isTwoToThe(iSurface.properties().size().y(),nHeightPow); nWidth = tUint(::pow(2.0f,nWidthPow)); nHeight = tUint(::pow(2.0f,nHeightPow)); tBool exactSize = (iSurface.properties().size().x()==nWidth && iSurface.properties().size().y()==nHeight); // For now just drop an error if the size isn't ok. if (!exactSize) { try { tempSurface.create( nWidth,nHeight, iSurface.format().bitsPerPixel(), iSurface.format().channelMask(cPixelFormat::Channel_Red), iSurface.format().channelMask(cPixelFormat::Channel_Green), iSurface.format().channelMask(cPixelFormat::Channel_Blue), iSurface.format().channelMask(cPixelFormat::Channel_Alpha) ); tUint32 emptyPixel; if (iSurface.format().channelMask(cPixelFormat::Channel_Alpha)) emptyPixel = tempSurface.mapRGBA(0,0,0,0); else emptyPixel = tempSurface.mapRGB(0,0,0); tempSurface.clearSurface( emptyPixel ); //cornerCopy( tempSurface, iSurface ); tempSurface.literalCopyBlit( tVector2u(0,0), iSurface ); } catch( const cSDLException & iException ) { throw cBadDataUseException( "cGLTexture::cGLTexture", tString("Size not power 2, and " "couldn\'t create a suitable conversion surface: ")+ tString(iException) ); } } // !exactSize if (mRawData) delete [](tUint8*)(mRawData); if (exactSize) getRawSurfaceData(iSurface, mNumComponents, mSize.x(), mSize.y(), mFormat, mType, mRawData); else getRawSurfaceData(tempSurface, mNumComponents, mSize.x(), mSize.y(), mFormat, mType, mRawData); } /**************************************************************************/ void cGLTexture::regenTexture() const { // Generate a new name for this texture glGenTextures(1,&mGLName); GLenum error; while ( (error=glGetError()) != GL_NO_ERROR ) throw cOpenGLException( "cGLTexture::cGLTexture", "glGenTextures:", error ); glBindTexture(GL_TEXTURE_2D,mGLName); while ( (error=glGetError()) != GL_NO_ERROR ) throw cOpenGLException( "cGLTexture::cGLTexture", "glBindTexture:", error ); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST); gluBuild2DMipmaps( GL_TEXTURE_2D, mNumComponents, mSize.x(), mSize.y(), mFormat, mType, mRawData ); while ( (error=glGetError()) != GL_NO_ERROR ) throw cOpenGLException( "cGLTexture::cGLTexture", "glBindTexture:", error ); } /**************************************************************************/ void cGLTexture::getRawSurfaceData( const cSurfaceInterface & i_surface, tUint &o_numComponents, tUint &o_width, tUint &o_height, GLenum &o_format, GLenum &o_type, void *&o_data ) const { if (i_surface.empty()) throw cBadDataUseException( "cGLTexture::getRawSurfaceData", "Tried to convert an uninitalized surface" ); // Set some values to be safe o_data = 0; // Set the stuff we already know o_width = i_surface.properties().size().getX(); o_height = i_surface.properties().size().getY(); o_type = GL_UNSIGNED_BYTE; // Get some information about the surface cPixelFormat::tChannelMask rMask,gMask,bMask,aMask; cPixelFormat::tBitCount rShift,gShift,bShift,aShift; cPixelFormat::tBitCount rLoss,gLoss,bLoss,aLoss; i_surface.format().channelMasks(rMask,gMask,bMask,aMask); i_surface.format().channelShifts(rShift,gShift,bShift,aShift); i_surface.format().channelLosses(rLoss,gLoss,bLoss,aLoss); // Figure out how many components we have o_numComponents = 0; if (rMask) ++o_numComponents; if (gMask) ++o_numComponents; if (bMask) ++o_numComponents; if (aMask) ++o_numComponents; switch (o_numComponents) { case 0: throw cBadDataUseException( "cGLTexture::getRawSurfaceData", "Tried to convert an 0 component surface? (Indexed?)" ); case 1: if (rMask) o_format = GL_RED; else if (gMask) o_format = GL_GREEN; else if (bMask) o_format = GL_BLUE; else o_format = GL_ALPHA; break; case 3: if ( !rMask || !gMask || !bMask ) throw cBadDataUseException( "cGLTexture::getRawSurfaceData", "Tried to convert a 3 component surface mixed " "with alpha" ); o_format = GL_RGB; break; case 4: o_format = GL_RGBA; break; default: throw cBadDataUseException( "cGLTexture::getRawSurfaceData", "Tried to convert an 2 component surface" ); } // switch // Get Some values we'll need const cPixelFormat::tByteCount BytesPerPixel = i_surface.format().bytesPerPixel(); const tUint NumPixels = o_width*o_height; const tUint ActualScanLineBytes = o_width*BytesPerPixel; const tUint PitchDiff = i_surface.properties().pitch() - ActualScanLineBytes; const tUint UnpackedDataSize = o_numComponents*NumPixels; // Aquire the surface for reading tUint8 *pixels = (tUint8*)(i_surface.aquireROBuffer()); const tUint8 *EOPixels = pixels + (o_height*i_surface.properties().pitch()); if (!pixels) throw cException( "cGLTexture::getRawSurfaceData", "Unable to aquire RO Buffer for conversion"); o_data = new tUint8[ UnpackedDataSize ]; tUint8 * dataPtr = (tUint8*)(o_data); tUint lineByteCount = 0; switch (o_format) { case GL_RGB: { while (EOPixels!=pixels) { tUint32 *unalignedData = (tUint32*)(pixels); *dataPtr = tUint8((((*unalignedData)&rMask) >> rShift << rLoss)); ++dataPtr; *dataPtr = tUint8((((*unalignedData)&gMask) >> gShift << gLoss)); ++dataPtr; *dataPtr = tUint8((((*unalignedData)&bMask) >> bShift << bLoss)); ++dataPtr; lineByteCount += 3; if (lineByteCount==ActualScanLineBytes) { lineByteCount = 0; pixels += PitchDiff; } pixels+=BytesPerPixel; } break; } case GL_RGBA: { while (EOPixels!=pixels) { tUint32 *unalignedData = (tUint32*)(pixels); *dataPtr = tUint8((((*unalignedData)&rMask) >> rShift << rLoss)); ++dataPtr; *dataPtr = tUint8((((*unalignedData)&gMask) >> gShift << gLoss)); ++dataPtr; *dataPtr = tUint8((((*unalignedData)&bMask) >> bShift << bLoss)); ++dataPtr; *dataPtr = tUint8((((*unalignedData)&aMask) >> aShift << aLoss)); ++dataPtr; lineByteCount += 4; if (lineByteCount==ActualScanLineBytes) { lineByteCount = 0; pixels += PitchDiff; } pixels+=BytesPerPixel; } break; } default: { // Release the buffers and die i_surface.releaseROBuffer(); delete [](tUint8*)o_data; throw cException( "cGLTexture::getRawSurfaceData", "Requested conversion not supported, yet."); } } // Format switch // Release the buffer i_surface.releaseROBuffer(); } /**************************************************************************/ const tBool cGLTexture::isTwoToThe( const tUint iNum, tUint &oClosest ) const { oClosest = 0; tDouble p; do { ++oClosest; p = ::pow(2.0f,oClosest); if (iNum==tUint(p)) return true; } while (p<iNum); return false; } } // Namespace

©2012 Aaron Cameron