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// -------------------------------------------
// SDL/OpenGL OpenGL application framework
// Jean-Luc PONS (2007)
// -------------------------------------------
#include "GLApp.h"
// -------------------------------------------
GLApplication::GLApplication(const char * strWindowTitle) :
m_strWindowTitle(strWindowTitle)
{
m_bWindowed = true;
m_strWindowTitle = "GL application";
strcpy((char *)m_strFrameStats,"");
m_screenWidth = 640;
m_screenHeight = 480;
}
// -------------------------------------------
int GLApplication::ToggleFullscreen() {
int errCode;
InvalidateDeviceObjects();
m_bWindowed = !m_bWindowed;
Uint32 flags;
if( m_bWindowed ) flags = SDL_OPENGL;
else flags = SDL_OPENGL | SDL_FULLSCREEN;
if( SDL_SetVideoMode( m_screenWidth, m_screenHeight, 0, flags ) == NULL )
{
printf("SDL_SetVideoMode() failed.\n");
return GL_FAIL;
}
SDL_Surface *vSurf = SDL_GetVideoSurface();
m_bitsPerPixel = vSurf->format->BitsPerPixel;
errCode = RestoreDeviceObjects();
if( !errCode ) {
printGlError();
exit(1);
}
return GL_OK;
}
// -------------------------------------------
int GLApplication::Create(int width, int height, BOOL bFullScreen ) {
int errCode;
m_screenWidth = width;
m_screenHeight = height;
m_bWindowed = !bFullScreen;
if( getenv("DISPLAY")==NULL ) {
printf("Warning, DISPLAY not defined, it may not work.\n");
}
//Initialize SDL
if( SDL_Init( SDL_INIT_EVERYTHING ) < 0 )
{
printf("SDL_Init() failed : %s\n" , SDL_GetError() );
return GL_FAIL;
}
//SDL_GL_SetAttribute(SDL_GL_SWAP_CONTROL, 0);
SDL_EnableUNICODE( 1 );
SDL_EnableKeyRepeat(SDL_DEFAULT_REPEAT_DELAY,SDL_DEFAULT_REPEAT_INTERVAL);
//Create Window
Uint32 flags;
if( m_bWindowed ) flags = SDL_OPENGL;
else flags = SDL_OPENGL | SDL_FULLSCREEN;
if( SDL_SetVideoMode( m_screenWidth, m_screenHeight, 0, flags ) == NULL )
{
printf("SDL_SetVideoMode() failed.\n");
return false;
}
SDL_Surface *vSurf = SDL_GetVideoSurface();
m_bitsPerPixel = vSurf->format->BitsPerPixel;
OneTimeSceneInit();
errCode = RestoreDeviceObjects();
if( !errCode ) {
printGlError();
exit(1);
}
SDL_WM_SetCaption( m_strWindowTitle, NULL );
return GL_OK;
}
// -------------------------------------------
void GLApplication::Pause(BOOL bPause) {
}
// -------------------------------------------
int GLApplication::Resize( DWORD width, DWORD height ) {
int errCode;
m_screenWidth = width;
m_screenHeight = height;
InvalidateDeviceObjects();
Uint32 flags;
if( m_bWindowed ) flags = SDL_OPENGL;
else flags = SDL_OPENGL | SDL_FULLSCREEN;
if( SDL_SetVideoMode( m_screenWidth, m_screenHeight, 0, flags ) == NULL )
{
printf("SDL_SetVideoMode() failed.\n");
return GL_FAIL;
}
SDL_Surface *vSurf = SDL_GetVideoSurface();
m_bitsPerPixel = vSurf->format->BitsPerPixel;
errCode = RestoreDeviceObjects();
if( !errCode ) {
printGlError();
exit(1);
}
return GL_OK;
}
// -------------------------------------------
int GLApplication::Run() {
SDL_Event event;
bool quit = false;
int nbFrame = 0;
int lastTick = 0;
int lastFrTick = 0;
int errCode;
int fTick;
int firstTick;
m_fTime = 0.0f;
m_fElapsedTime = 0.0f;
m_fFPS = 0.0f;
lastTick = lastFrTick = firstTick = SDL_GetTicks();
//Wait for user exit
while( quit == false )
{
//While there are events to handle
while( SDL_PollEvent( &event ) )
{
if( event.type == SDL_QUIT )
quit = true;
else
EventProc(&event);
}
fTick = SDL_GetTicks();
// Update timing
nbFrame++;
if( (fTick - lastTick) >= 1000 ) {
int t0 = fTick;
int t = t0 - lastTick;
m_fFPS = (float)(nbFrame*1000) / (float)t;
nbFrame = 0;
lastTick = t0;
sprintf(m_strFrameStats,"%.2f fps (%dx%dx%d)",m_fFPS,m_screenWidth,m_screenHeight,m_bitsPerPixel);
}
m_fTime = (float) ( fTick - firstTick ) / 1000.0f;
m_fElapsedTime = (fTick - lastFrTick) / 1000.0f;
lastFrTick = fTick;
if(!quit) errCode = FrameMove();
if( !errCode ) quit = true;
if( glGetError() != GL_NO_ERROR ) { printGlError(); quit = true; }
if(!quit) errCode = Render();
if( !errCode ) quit = true;
if( glGetError() != GL_NO_ERROR ) { printGlError(); quit = true; }
//Swap buffer
SDL_GL_SwapBuffers();
}
//Clean up
SDL_Quit();
return GL_OK;
}
// -------------------------------------------
void GLApplication::SetMaterial(GLMATERIAL *mat) {
float acolor[] = { mat->Ambient.r, mat->Ambient.g, mat->Ambient.b, mat->Ambient.a };
glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, acolor);
float dcolor[] = { mat->Diffuse.r, mat->Diffuse.g, mat->Diffuse.b, mat->Diffuse.a };
glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, dcolor);
float scolor[] = { mat->Specular.r, mat->Specular.g, mat->Specular.b, mat->Specular.a };
glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, scolor);
float ecolor[] = { mat->Emissive.r, mat->Emissive.g, mat->Emissive.b, mat->Emissive.a };
glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, ecolor);
glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, mat->Power);
glColor4f(mat->Ambient.r, mat->Ambient.g, mat->Ambient.b, mat->Ambient.a);
}
// -------------------------------------------
void GLApplication::printGlError() {
GLenum errCode = glGetError();
switch( errCode ) {
case GL_INVALID_ENUM:
printf("OpenGL failure: An unacceptable value is specified for an enumerated argument. The offending function is ignored, having no side effect other than to set the error flag.\n");
break;
case GL_INVALID_VALUE:
printf("OpenGL failure: A numeric argument is out of range. The offending function is ignored, having no side effect other than to set the error flag.\n");
break;
case GL_INVALID_OPERATION:
printf("OpenGL failure: The specified operation is not allowed in the current state. The offending function is ignored, having no side effect other than to set the error flag.\n");
break;
case GL_STACK_OVERFLOW:
printf("OpenGL failure: This function would cause a stack overflow. The offending function is ignored, having no side effect other than to set the error flag.\n");
break;
case GL_STACK_UNDERFLOW:
printf("OpenGL failure: This function would cause a stack underflow. The offending function is ignored, having no side effect other than to set the error flag.\n");
break;
case GL_OUT_OF_MEMORY:
printf("OpenGL failure: There is not enough memory left to execute the function. The state of OpenGL is undefined, except for the state of the error flags, after this error is recorded.\n");
break;
}
}
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