tibia-client/src/framework/graphics/texture.cpp

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/*
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* Copyright (c) 2010-2012 OTClient <https://github.com/edubart/otclient>
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*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
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#include "texture.h"
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#include "graphics.h"
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#include "framebuffer.h"
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Texture::Texture()
{
m_textureId = 0;
}
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Texture::Texture(int width, int height, int channels, uchar *pixels)
{
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// generate opengl texture
m_textureId = internalLoadGLTexture(pixels, channels, width, height);
}
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Texture::~Texture()
{
// free texture from gl memory
if(m_textureId > 0)
glDeleteTextures(1, &m_textureId);
}
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uint Texture::internalLoadGLTexture(uchar *pixels, int channels, int width, int height)
{
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m_size.resize(width, height);
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// gets max texture size supported by the driver
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static GLint maxTexSize = -1;
if(maxTexSize == -1)
glGetIntegerv(GL_MAX_TEXTURE_SIZE, &maxTexSize);
// checks texture max size
if(width > maxTexSize || height > maxTexSize) {
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logError("loading texture with size ", width, "x", height, " failed, "
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"the maximum size allowed by the graphics card is ", maxTexSize, "x", maxTexSize, ",",
"to prevent crashes the texture will be displayed as a blank texture");
//TODO: make a workaround, could be bilinear scaling the texture
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return 0;
}
// generate gl texture
GLuint id;
glGenTextures(1, &id);
glBindTexture(GL_TEXTURE_2D, id);
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// detect pixels GL format
GLenum format = 0;
switch(channels) {
case 4:
format = GL_RGBA;
break;
case 3:
format = GL_RGB;
break;
case 2:
format = GL_LUMINANCE_ALPHA;
break;
case 1:
format = GL_LUMINANCE;
break;
}
// load pixels into gl memory
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, m_size.width(), m_size.height(), 0, format, GL_UNSIGNED_BYTE, pixels);
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// disable texture border
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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// nearest filtering (non smooth)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
return id;
}
void Texture::setSmooth(bool smooth)
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{
if(smooth == m_smooth)
return;
if(smooth) {
// enable smooth texture
glBindTexture(GL_TEXTURE_2D, m_textureId);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
} else {
// nearest filtering (non smooth)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
}
m_smooth = true;
}
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std::vector<uint8> Texture::getPixels()
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{
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// hack to copy pixels from opengl memory
FrameBufferPtr fb(new FrameBuffer(m_size));
std::vector<uint8> pixels(m_size.area()*4, 0);
fb->bind();
g_painter.drawTexturedRect(Rect(0,0,m_size), shared_from_this());
glReadPixels(0, 0, m_size.width(), m_size.height(), GL_RGBA, GL_UNSIGNED_BYTE, &pixels[0]);
fb->release();
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return pixels;
}