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3.8 KiB

/* libsegl - Sebas Extended GL Library
* Collection of Opengl/3D-Math helpers
*
* Copyright (c) 2008 by Sebastian Lohff, seba@seba-geek.de
* http://www.seba-geek.de
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "glsdlscreen.h"
namespace segl {
GLSDLScreen::GLSDLScreen() {
width = 0;
height = 1;
bpp = 16;
znear = 1.0f;
zfar = 100.0f;
opengl = false;
glsetup = true;
resizable = false;
fullscreen = false;
extraglparam = 0;
}
int GLSDLScreen::getFlags() {
const SDL_VideoInfo *videoInfo = SDL_GetVideoInfo();
int videoflags = 0;
if(videoInfo->hw_available)
videoflags |= SDL_HWSURFACE;
else
videoflags |= SDL_SWSURFACE;
if(videoInfo->blit_hw)
videoflags |= SDL_HWACCEL;
if(opengl) {
videoflags |= SDL_OPENGL;
videoflags |= SDL_GL_DOUBLEBUFFER;
videoflags |= SDL_HWPALETTE;
}
if(fullscreen)
videoflags |= SDL_FULLSCREEN;
return videoflags;
}
void GLSDLScreen::enableOpenGL(bool w) {
opengl = w;
}
void GLSDLScreen::enableResizable(bool w) {
resizable = w;
}
void GLSDLScreen::enableFullscreen(bool w) {
fullscreen = w;
}
void GLSDLScreen::setGLNearFar(float _znear, float _zfar) {
znear = _znear;
zfar = _zfar;
}
void GLSDLScreen::enableGLSetup(bool w) {
glsetup = w;
}
void GLSDLScreen::setExtraGLParamFunc(void (*extrafunc)()) {
extraglparam = extrafunc;
}
void GLSDLScreen::setVideoMode(int _width, int _height, int _bpp) {
width = _width;
height = _height;
bpp = _bpp;
if(height==0)
height = 1;
}
void GLSDLScreen::getVideoRes(std::string vidstr, int *_w, int *_h) {
if(_w)
*_w = atoi(vidstr.substr(0, vidstr.find("x")).c_str());
if(_h)
*_h = atoi(vidstr.substr(vidstr.find("x")+1, (vidstr.length()-vidstr.find("x")-1)).c_str());
}
bool GLSDLScreen::isOK() {
return SDL_VideoModeOK(width, height, bpp, getFlags());
}
bool GLSDLScreen::apply() {
if(!SDL_WasInit(SDL_INIT_VIDEO)) {
if(SDL_Init(SDL_INIT_VIDEO)==-1) {
std::cerr << "Konnte SDL_VIDEO nicht initialisieren" << std::endl;
return false;
}
}
screen = SDL_SetVideoMode(width, height, bpp, getFlags());
if(!screen) {
return false;
}
if(opengl) {
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
// Setup GL
if(glsetup) {
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glClearDepth(1.0f);
glDepthFunc(GL_LEQUAL);
glShadeModel(GL_SMOOTH);
glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
glEnable(GL_ALPHA_TEST);
glAlphaFunc(GL_GREATER, 0.1);
glEnable(GL_DEPTH_TEST);
}
// Projection
glViewport(0, 0, (GLsizei)width, (GLsizei)height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45.0f, (GLfloat)width/(GLfloat)height, znear, zfar);
if(extraglparam) {
extraglparam();
}
// Texturen neuladen, eigentlich nur f<>r Windows. Aber egal.
GLTexture::reloadAll();
glMatrixMode(GL_TEXTURE);
glLoadIdentity();
glMatrixMode(GL_MODELVIEW);
}
return true;
}
int GLSDLScreen::getWidth() {
return width;
}
int GLSDLScreen::getHeight() {
return height;
}
void GLSDLScreen::clearScreen() {
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
}
void GLSDLScreen::renderScreen() {
SDL_GL_SwapBuffers();
}
} // namespace segl