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Diffstat (limited to 'examples/qtgl/myqgl.cpp')
| -rw-r--r-- | examples/qtgl/myqgl.cpp | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/examples/qtgl/myqgl.cpp b/examples/qtgl/myqgl.cpp new file mode 100644 index 0000000..42fe1da --- /dev/null +++ b/examples/qtgl/myqgl.cpp @@ -0,0 +1,182 @@ +#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(QWidget *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()) + { + qWarning("Can't load BMP library."); + qApp->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) + { + qWarning("Library corrupted."); + lib.unload(); + qApp->quit(); + } + + const char *s = "../w3.bmp"; + + // if the image doesn't exist + if(!QFile::exists(s)) + { + qWarning("Can't find example image."); + lib.unload(); + qApp->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(); +} |