You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
125 lines
3.8 KiB
125 lines
3.8 KiB
#include "texture.h"
|
|
#include "graphics.h"
|
|
|
|
#include <GL/gl.h>
|
|
|
|
Texture::Texture(int width, int height, int channels, uchar *pixels)
|
|
{
|
|
// generate opengl texture
|
|
m_textureId = internalLoadGLTexture(pixels, channels, width, height);
|
|
}
|
|
|
|
uint Texture::internalLoadGLTexture(uchar *pixels, int channels, int width, int height)
|
|
{
|
|
m_size.setSize(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("ERROR: 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");
|
|
return 0;
|
|
}
|
|
|
|
// generate gl texture
|
|
GLuint id;
|
|
glGenTextures(1, &id);
|
|
glBindTexture(GL_TEXTURE_2D, id);
|
|
bool mustFree = false;
|
|
|
|
// old opengl drivers only accept power of two dimensions
|
|
if(!g_graphics.isExtensionSupported("GL_ARB_texture_non_power_of_two") && pixels) {
|
|
int glWidth = 1;
|
|
while(glWidth < width)
|
|
glWidth = glWidth << 1;
|
|
|
|
int glHeight = 1;
|
|
while(glHeight < height)
|
|
glHeight = glHeight << 1;
|
|
|
|
if(m_size != m_glSize) {
|
|
uchar *tmp = new uchar[glHeight*glWidth*channels];
|
|
memset(tmp, 0, glHeight*glWidth*channels);
|
|
if(pixels)
|
|
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;
|
|
mustFree = true;
|
|
}
|
|
|
|
m_glSize.setSize(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, channels, 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);
|
|
|
|
if(mustFree)
|
|
delete[] pixels;
|
|
|
|
return id;
|
|
}
|
|
|
|
Texture::~Texture()
|
|
{
|
|
// free texture from gl memory
|
|
if(m_textureId)
|
|
glDeleteTextures(1, &m_textureId);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
uchar* Texture::getPixels()
|
|
{
|
|
// copy pixels from opengl memory
|
|
uchar* pixels = new uchar[m_glSize.area()*4];
|
|
glBindTexture(GL_TEXTURE_2D, m_textureId);
|
|
glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
|
|
|
|
// 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;
|
|
}
|