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. */
}