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

145 lines
4.8 KiB
C++

/*
* Copyright (c) 2010-2011 OTClient <https://github.com/edubart/otclient>
*
* 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.
*/
#include "texture.h"
#include "graphics.h"
Texture::Texture()
{
m_textureId = 0;
}
Texture::Texture(int width, int height, int channels, uchar *pixels)
{
// generate opengl texture
m_textureId = internalLoadGLTexture(pixels, channels, width, height);
}
Texture::~Texture()
{
// free texture from gl memory
if(m_textureId > 0)
glDeleteTextures(1, &m_textureId);
}
uint Texture::internalLoadGLTexture(uchar *pixels, int channels, int width, int height)
{
m_size.resize(width, height);
// gets max texture size supported by the driver
static GLint maxTexSize = -1;
if(maxTexSize == -1)
glGetIntegerv(GL_MAX_TEXTURE_SIZE, &maxTexSize);
// checks texture max size
if(width > maxTexSize || height > maxTexSize) {
logError("loading texture with size ", width, "x", height, " failed, "
"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
return 0;
}
// generate gl texture
GLuint id;
glGenTextures(1, &id);
glBindTexture(GL_TEXTURE_2D, id);
std::vector<uint8> tmp;
// old opengl drivers only accept power of two dimensions
//if(!g_painter.isExtensionSupported("GL_ARB_texture_non_power_of_two")) {
int glWidth = 1;
while(glWidth < width)
glWidth = glWidth << 1;
int glHeight = 1;
while(glHeight < height)
glHeight = glHeight << 1;
if(m_size != m_glSize && pixels) {
tmp.resize(glHeight*glWidth*channels, 0);
for(int y=0; y<height; ++y)
for(int x=0; x<width; ++x)
for(int i=0; i<channels; ++i)
tmp[y*glWidth*channels+x*channels+i] = pixels[y*width*channels+x*channels+i];
pixels = &tmp[0];
}
m_glSize.resize(glWidth, glHeight);
//} else
// m_glSize = m_size;
// 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
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, m_glSize.width(), m_glSize.height(), 0, format, GL_UNSIGNED_BYTE, pixels);
// 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);
// 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::enableBilinearFilter()
{
// 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);
}
std::vector<uint8> Texture::getPixels()
{
// copy pixels from opengl memory
std::vector<uint8> pixels(m_glSize.area()*4, 0);
glBindTexture(GL_TEXTURE_2D, m_textureId);
glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_BYTE, &pixels[0]);
// convert pixels to the real texture size
if(m_size != m_glSize)
for(int y=0; y<m_size.height(); ++y)
for(int x=0; x<m_size.width(); ++x)
for(int i=0; i<4; ++i)
pixels[y*m_size.width()*4+x*4+i] = pixels[y*m_glSize.width()*4+x*4+i];
return pixels;
}