140 lines
4.5 KiB
C++
140 lines
4.5 KiB
C++
/* The MIT License
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*
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* Copyright (c) 2010 OTClient, https://github.com/edubart/otclient
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <prerequisites.h>
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#include <graphics/texture.h>
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#include "graphics.h"
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Texture::Texture(int width, int height, int channels, uchar *pixels)
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{
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// generate opengl texture
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m_textureId = internalLoadGLTexture(pixels, channels, width, height);
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}
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uint Texture::internalLoadGLTexture(uchar *pixels, int channels, int width, int height)
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{
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GLint texSize;
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glGetIntegerv(GL_MAX_TEXTURE_SIZE, &texSize);
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if(width > texSize || height > texSize) {
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flogError("loading texture with size %dx%d failed, the maximum size is %dx%d", width % height % texSize % texSize);
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return 0;
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}
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// generate gl texture
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GLuint id;
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glGenTextures(1, &id);
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glBindTexture(GL_TEXTURE_2D, id);
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m_size.setSize(width, height);
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bool mustFree = false;
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if(!g_graphics.isExtensionSupported("GL_ARB_texture_non_power_of_two") && pixels) {
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int glWidth = 1;
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while(glWidth < width)
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glWidth = glWidth << 1;
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int glHeight = 1;
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while(glHeight < height)
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glHeight = glHeight << 1;
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if(m_size != m_glSize) {
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uchar *tmp = new uchar[glHeight*glWidth*channels];
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memset(tmp, 0, glHeight*glWidth*channels);
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if(pixels)
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for(int y=0;y<height;++y)
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for(int x=0;x<width;++x)
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for(int i=0;i<channels;++i)
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tmp[y*glWidth*channels+x*channels+i] = pixels[y*width*channels+x*channels+i];
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pixels = tmp;
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mustFree = true;
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}
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m_glSize.setSize(glWidth, glHeight);
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} else
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m_glSize = m_size;
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// detect pixels GL format
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GLenum format = 0;
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switch(channels) {
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case 4:
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format = GL_RGBA;
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break;
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case 3:
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format = GL_RGB;
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break;
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case 2:
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format = GL_LUMINANCE_ALPHA;
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break;
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case 1:
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format = GL_LUMINANCE;
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break;
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}
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// load pixels into gl memory
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glTexImage2D(GL_TEXTURE_2D, 0, channels, m_glSize.width(), m_glSize.height(), 0, format, GL_UNSIGNED_BYTE, pixels);
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// disable texture border
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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// nearest filtering
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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// free if needed
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if(mustFree)
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delete[] pixels;
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return id;
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}
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Texture::~Texture()
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{
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if(m_textureId)
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glDeleteTextures(1, &m_textureId);
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}
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void Texture::enableBilinearFilter()
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{
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glBindTexture(GL_TEXTURE_2D, m_textureId);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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}
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uchar *Texture::getPixels()
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{
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// copy pixels from opengl memory
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uchar *pixels = new uchar[m_glSize.area()*4];
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glBindTexture(GL_TEXTURE_2D, m_textureId);
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glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
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// convert pixels to the real texture size
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if(m_size != m_glSize)
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for(int y=0;y<m_size.height();++y)
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for(int x=0;x<m_size.width();++x)
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for(int i=0;i<4;++i)
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pixels[y*m_size.width()*4+x*4+i] = pixels[y*m_glSize.width()*4+x*4+i];
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return pixels;
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}
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