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#include <qlibrary.h>
#include <qapplication.h>
#include <qfile.h>
#include <GL/gl.h>
#include "myqgl.h"
#include "ksquirrel-libs/fmt_utils.h"
#include "ksquirrel-libs/error.h"
MyQGL::MyQGL(TQWidget *parent, const char *name) : QGLWidget(parent, name), bits(0), w(0), h(0)
{}
MyQGL::~MyQGL()
{}
void MyQGL::initializeGL()
{
qglClearColor(white);
glClearDepth(1.0f);
glEnable(GL_DEPTH_TEST);
glEnable(GL_ALPHA_TEST);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glShadeModel(GL_FLAT);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glMatrixMode(GL_MODELVIEW);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
}
void MyQGL::resizeGL(int width, int height)
{
glViewport(0, 0, width, height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-width/2, width/2, -height/2, height/2, 0.1f, 100.0f);
gluLookAt(0,0,1, 0,0,0, 0,1,0);
glMatrixMode(GL_MODELVIEW);
}
void MyQGL::paintGL()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, tex);
glBegin(GL_QUADS);
glTexCoord2f(0.0f, 0.0f); glVertex2f(-w/2, h/2);
glTexCoord2f(1.0f, 0.0f); glVertex2f(w/2, h/2);
glTexCoord2f(1.0f, 1.0f); glVertex2f(w/2, -h/2);
glTexCoord2f(0.0f, 1.0f); glVertex2f(-w/2, -h/2);
glEnd();
glDisable(GL_TEXTURE_2D);
}
void MyQGL::loadImage()
{
// try to load BMP library
QLibrary lib("/usr/lib/ksquirrel-libs/libkls_bmp.so");
lib.load();
// no such library
if(!lib.isLoaded())
{
tqWarning("Can't load BMP library.");
tqApp->quit();
}
int i = 0;
fmt_info finfo;
RGBA *image;
int current = 0;
// resolve neccessary functions
codec_create = (fmt_codec_base*(*)())lib.resolve("codec_create");
codec_destroy = (void (*)(fmt_codec_base*))lib.resolve("codec_destroy");
// library corrupted!
if(!codec_create || !codec_destroy)
{
tqWarning("Library corrupted.");
lib.unload();
tqApp->quit();
}
const char *s = "../w3.bmp";
// if the image doesn't exist
if(!QFile::exists(s))
{
tqWarning("Can't find example image.");
lib.unload();
tqApp->quit();
}
// OK, create decoder
codeK = codec_create();
// init library
i = codeK->read_init(s);
if(i != SQE_OK)
{
codeK->read_close();
return;
}
// move to the next image
i = codeK->read_next();
// save retrieved information
finfo = codeK->information();
if(i != SQE_OK)
{
codeK->read_close();
return;
}
image = (RGBA*)calloc(finfo.image[current].w * finfo.image[current].h, sizeof(RGBA));
if(!image)
{
codeK->read_close();
return;
}
memset(image, 255, finfo.image[current].w * finfo.image[current].h * sizeof(RGBA));
RGBA *scan;
// OK, let's decode the image line-by-line, pass-by-pass
for(int pass = 0;pass < finfo.image[current].passes;pass++)
{
codeK->read_next_pass();
for(int j = 0;j < finfo.image[current].h;j++)
{
scan = image + j * finfo.image[current].w;
codeK->read_scanline(scan);
}
}
// flip, if neccessary (BMP requires flipping)
if(finfo.image[current].needflip)
fmt_utils::flipv((char*)image, finfo.image[current].w * sizeof(RGBA), finfo.image[current].h);
// close library
codeK->read_close();
w = finfo.image[current].w;
h = finfo.image[current].h;
bits = image;
}
void MyQGL::bind()
{
loadImage();
if(!bits)
return;
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_2D, tex);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
// remember, that texture dimensions should be a power of two, e.g.
// 32, 64, 256, ...
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, bits);
updateGL();
}
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