func main() { initialWidth, initialHeight := 1280, 720 runtime.LockOSThread() if sdlInit := sdl.Init(sdl.INIT_VIDEO); sdlInit != 0 { panic("SDL init error") } reinitScreen(initialWidth, initialHeight) defer cleanExit(true, false) if err := gl.Init(); err != nil { panic(err) } gl.Enable(gl.BLEND) gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA) gl.Enable(gl.DEPTH) defer cleanExit(false, true) glSetupShaderProg(&shaderTextureCreator, false) glSetupShaderProg(&shaderTextureDisplay, true) glFillBuffer(rttVerts, &rttVertBuf) glFillBuffer(dispVerts, &dispVertBuf) gl.GenTextures(1, &rttFrameTex) gl.BindTexture(gl.TEXTURE_2D, rttFrameTex) gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST) gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST) gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT) gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT) if doRtt { gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, texSize, texSize, 0, gl.RGBA, gl.UNSIGNED_BYTE, nil) gl.GenFramebuffers(1, &rttFrameBuf) gl.BindFramebuffer(gl.FRAMEBUFFER, rttFrameBuf) gl.FramebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, rttFrameTex, 0) gl.BindFramebuffer(gl.FRAMEBUFFER, 0) } else { glFillTextureFromImageFile("texture.jpg") } gl.BindTexture(gl.TEXTURE_2D, 0) gl.ClearColor(0.3, 0.6, 0.9, 1) gl.Clear(gl.COLOR_BUFFER_BIT) gl.ActiveTexture(gl.TEXTURE0) for { if evt := sdl.PollEvent(); evt != nil { switch event := evt.(type) { case *sdl.ResizeEvent: reinitScreen(int(event.W), int(event.H)) case *sdl.QuitEvent: return } } else { if doRtt { renderToTexture() } renderToScreen() sdl.GL_SwapBuffers() } } sdl.Quit() }
func main() { sdl.Init(sdl.INIT_VIDEO) screen = sdl.SetVideoMode(300, 300, 16, sdl.OPENGL|sdl.RESIZABLE) if !screen { fprintf(stderr, "Couldn't set 300x300 GL video mode: %s\n", sdl.GetError()) sdl.Quit() exit(2) } sdl.WM_SetCaption("Gears", "gears") init(argc, argv) reshape(screen.w, screen.h) done := false for !done { var event sdl.Event idle() for sdl.PollEvent(&event) { switch event.Type { case sdl.VIDEORESIZE: screen = sdl.SetVideoMode(event.resize.w, event.resize.h, 16, sdl.OPENGL|sdl.RESIZABLE) if screen { reshape(screen.w, screen.h) } else { /* Uh oh, we couldn't set the new video mode?? */ } break case sdl.QUIT: done = true break } } keys = sdl.GetKeyState(NULL) if keys[SDLK_ESCAPE] { done = true } if keys[SDLK_UP] { view_rotx += 5.0 } if keys[SDLK_DOWN] { view_rotx -= 5.0 } if keys[SDLK_LEFT] { view_roty += 5.0 } if keys[SDLK_RIGHT] { view_roty -= 5.0 } if keys[SDLK_z] { if sdl.GetModState() & KMOD_SHIFT { view_rotz -= 5.0 } else { view_rotz += 5.0 } } draw() } sdl.Quit() return 0 /* ANSI C requires main to return int. */ }