QT+SDL+OPENGL

#include <windows.h> #include <GL/gl.h> #include <GL/glu.h> #include "mainwindow.h" #include "SDL_GL.h" static GLboolean should_rotate = GL_TRUE; static void quit_SDL( int code ) { SDL_Quit( ); exit( code ); } /* 设置OPENGL的相关属性 */ static void setup_opengl( int width, int height ) { /* 比率,宽度除以高度 */ float ratio = (float) width / (float) height; /* 控制两点间其他点颜色的过渡模式 GL_SMOOTH是平滑过渡，表现出来的是渐变 GL_FLAT是以指定的抹一点的单一颜色绘制其他所有点 */ //glShadeModel( GL_FLAT ); glShadeModel( GL_SMOOTH ); glCullFace( GL_BACK ); //glCullFace(GL_FRONT); //glCullFace(GL_FRONT_AND_BACK); glFrontFace( GL_CCW ); glEnable( GL_CULL_FACE ); glClearColor( 0.5, 0.5, 0.5, 0.5 ); glViewport( 0, 0, width, height ); glMatrixMode( GL_PROJECTION ); glLoadIdentity( ); gluPerspective( 60.0, ratio, 1.0, 1024.0 ); } static void handle_key_down( SDL_keysym* keysym ) { switch( keysym->sym ) { case SDLK_ESCAPE: quit_SDL( 0 ); break; case SDLK_SPACE: should_rotate = !should_rotate; break; default: break; } } static void process_events( void ) { SDL_Event event; while( SDL_PollEvent( &event ) ) { switch( event.type ) { case SDL_KEYDOWN: handle_key_down( &event.key.keysym ); break; case SDL_QUIT: quit_SDL( 0 ); break; case VIDEO_PLAY: printf("VIDEO_PLAY\n",1); break; case VIDEO_STOP: printf("VIDEO_STOP\n",2); break; case VIDEO_PAUSE: printf("VIDEO_PAUSE\n",1); break; } } } static void draw_scren(void) { static float angle = 0.0f; static GLfloat v0[] = {-1.0f, -1.0f, 1.0f}; static GLfloat v1[] = { 1.0f, -1.0f, 1.0f}; static GLfloat v2[] = { 1.0f, 1.0f, 1.0f}; static GLfloat v3[] = {-1.0f, 1.0f, 1.0f}; static GLfloat v4[] = {-1.0f, -1.0f, -1.0f}; static GLfloat v5[] = { 1.0f, -1.0f, -1.0f}; static GLfloat v6[] = { 1.0f, 1.0f, -1.0f}; static GLfloat v7[] = {-1.0f, 1.0f, -1.0f}; static GLubyte red[] = {255, 0, 0, 255}; static GLubyte green[] = {0, 255, 0, 255}; static GLubyte blue[] = {0, 0, 255, 255}; static GLubyte white[] = {255, 255, 255, 255}; static GLubyte yellow[] = {0, 255, 255, 255}; static GLubyte black[] = {0, 0, 0, 255}; static GLubyte orange[] = {255, 255, 0, 255}; static GLubyte purple[] = {255, 0, 255, 0}; glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glTranslatef(0.0, 0.0, -4.0); glRotatef(angle, 1.0, 2.0, 0.0); if (should_rotate) { if (++angle > 360.0f) { angle = 0.0f; } } /* 立方体有6个面，下面的绘制把每个面分成两个三角形来渲染的，所以做了12组操作 */ glBegin(GL_TRIANGLES); glColor4ubv( red ); glVertex3fv( v0 ); glColor4ubv( green ); glVertex3fv( v1 ); glColor4ubv( blue ); glVertex3fv( v2 ); glColor4ubv( red ); glVertex3fv( v0 ); glColor4ubv( blue ); glVertex3fv( v2 ); glColor4ubv( white ); glVertex3fv( v3 ); glColor4ubv( green ); glVertex3fv( v1 ); glColor4ubv( black ); glVertex3fv( v5 ); glColor4ubv( orange ); glVertex3fv( v6 ); glColor4ubv( green ); glVertex3fv( v1 ); glColor4ubv( orange ); glVertex3fv( v6 ); glColor4ubv( blue ); glVertex3fv( v2 ); glColor4ubv( black ); glVertex3fv( v5 ); glColor4ubv( yellow ); glVertex3fv( v4 ); glColor4ubv( purple ); glVertex3fv( v7 ); glColor4ubv( black ); glVertex3fv( v5 ); glColor4ubv( purple ); glVertex3fv( v7 ); glColor4ubv( orange ); glVertex3fv( v6 ); glColor4ubv( yellow ); glVertex3fv( v4 ); glColor4ubv( red ); glVertex3fv( v0 ); glColor4ubv( white ); glVertex3fv( v3 ); glColor4ubv( yellow ); glVertex3fv( v4 ); glColor4ubv( white ); glVertex3fv( v3 ); glColor4ubv( purple ); glVertex3fv( v7 ); glColor4ubv( white ); glVertex3fv( v3 ); glColor4ubv( blue ); glVertex3fv( v2 ); glColor4ubv( orange ); glVertex3fv( v6 ); glColor4ubv( white ); glVertex3fv( v3 ); glColor4ubv( orange ); glVertex3fv( v6 ); glColor4ubv( purple ); glVertex3fv( v7 ); glColor4ubv( green ); glVertex3fv( v1 ); glColor4ubv( red ); glVertex3fv( v0 ); glColor4ubv( yellow ); glVertex3fv( v4 ); glColor4ubv( green ); glVertex3fv( v1 ); glColor4ubv( yellow ); glVertex3fv( v4 ); glColor4ubv( black ); glVertex3fv( v5 ); glEnd(); SDL_GL_SwapBuffers(); } /* SDL线程里面的主循环 */ int sdl_main_loop(void *window) { const SDL_VideoInfo *info = NULL; int width = 0; int height = 0; int bpp = 0; int flags = 0; QWidget *screen = (QWidget*)window; info = SDL_GetVideoInfo( ); /* 获取视频硬件的相关信息，主要为了获得bpp */ if( !info ) { fprintf( stderr, "Video query failed: %s\n", SDL_GetError( ) ); quit_SDL( 1 ); } width = screen->width(); height = screen->height(); width = 400; height = 400; bpp = info->vfmt->BitsPerPixel; /* 设置属性，RGB的大小和位深，开启双缓冲 */ SDL_GL_SetAttribute( SDL_GL_RED_SIZE, 8 ); SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, 8 ); SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, 8 ); SDL_GL_SetAttribute( SDL_GL_DEPTH_SIZE, 24 ); SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 ); /* 设置视频属性， 这是为了创建一个OPENGL渲染的上下文 */ flags = SDL_OPENGL; if( SDL_SetVideoMode( width, height, bpp, flags ) == 0 ) { fprintf( stderr, "Video mode set failed: %s\n", SDL_GetError( ) ); quit_SDL( 1 ); } setup_opengl( width, height ); while( 1 ) { process_events(); draw_scren(); SDL_Delay(1); } return 0; }