private static void redraw_scene(EglSurface surface)
{
// Start with a clear screen
GL.Clear(ClearBufferMask.ColorBufferBit);
GlDumpError();
// Draw first (front) face:
// Bind texture surface to current vertices
GL.BindTexture(TextureTarget.Texture2D, tex[0]);
GlDumpError();
// Need to rotate textures - do this by rotating each cube face
GL.Rotatef(270.0f, 0.0f, 0.0f, 1.0f); // front face normal along z axis
GlDumpError();
// draw first 4 vertices
GL.DrawArrays(PrimitiveType.TriangleStrip, 0, 4);
GlDumpError();
// same pattern for other 5 faces - rotation chosen to make image orientation 'nice'
GL.BindTexture(TextureTarget.Texture2D, tex[1]);
GlDumpError();
GL.Rotatef(90.0f, 0.0f, 0.0f, 1.0f); // back face normal along z axis
GlDumpError();
GL.DrawArrays(PrimitiveType.TriangleStrip, 4, 4);
GlDumpError();
GL.BindTexture(TextureTarget.Texture2D, tex[2]);
GlDumpError();
GL.Rotatef(90.0f, 1.0f, 0.0f, 0.0f); // left face normal along x axis
GlDumpError();
GL.DrawArrays(PrimitiveType.TriangleStrip, 8, 4);
GlDumpError();
GL.BindTexture(TextureTarget.Texture2D, tex[3]);
GlDumpError();
GL.Rotatef(90.0f, 1.0f, 0.0f, 0.0f); // right face normal along x axis
GlDumpError();
GL.DrawArrays(PrimitiveType.TriangleStrip, 12, 4);
GlDumpError();
GL.BindTexture(TextureTarget.Texture2D, tex[4]);
GlDumpError();
GL.Rotatef(270.0f, 0.0f, 1.0f, 0.0f); // top face normal along y axis
GlDumpError();
GL.DrawArrays(PrimitiveType.TriangleStrip, 16, 4);
GlDumpError();
GL.BindTexture(TextureTarget.Texture2D, tex[5]);
GlDumpError();
GL.Rotatef(90.0f, 0.0f, 1.0f, 0.0f); // bottom face normal along y axis
GlDumpError();
GL.DrawArrays(PrimitiveType.TriangleStrip, 20, 4);
GlDumpError();
surface.SwapBuffers();
}
void Init(DrmCard card, DrmResources resources, DrmConnector connector, DrmModeInfo modeInfo)
{
FbDestroyDelegate = FbDestroyCallback;
_card = card;
uint GetCrtc()
{
if (resources.Encoders.TryGetValue(connector.EncoderId, out var encoder))
{
// Not sure why that should work
return(encoder.Encoder.crtc_id);
}
else
{
foreach (var encId in connector.EncoderIds)
{
if (resources.Encoders.TryGetValue(encId, out encoder) &&
encoder.PossibleCrtcs.Count > 0)
{
return(encoder.PossibleCrtcs.First().crtc_id);
}
}
throw new InvalidOperationException("Unable to find CRTC matching the desired mode");
}
}
_crtcId = GetCrtc();
var device = gbm_create_device(card.Fd);
_gbmTargetSurface = gbm_surface_create(device, modeInfo.Resolution.Width, modeInfo.Resolution.Height,
GbmColorFormats.GBM_FORMAT_XRGB8888, GbmBoFlags.GBM_BO_USE_SCANOUT | GbmBoFlags.GBM_BO_USE_RENDERING);
if (_gbmTargetSurface == null)
{
throw new InvalidOperationException("Unable to create GBM surface");
}
_eglDisplay = new EglDisplay(new EglInterface(eglGetProcAddress), 0x31D7, device, null);
_eglSurface = _eglDisplay.CreateWindowSurface(_gbmTargetSurface);
EglContext CreateContext(EglContext share)
{
var offSurf = gbm_surface_create(device, 1, 1, GbmColorFormats.GBM_FORMAT_XRGB8888,
GbmBoFlags.GBM_BO_USE_RENDERING);
if (offSurf == null)
{
throw new InvalidOperationException("Unable to create 1x1 sized GBM surface");
}
return(_eglDisplay.CreateContext(share, _eglDisplay.CreateWindowSurface(offSurf)));
}
_immediateContext = CreateContext(null);
_deferredContext = CreateContext(_immediateContext);
_immediateContext.MakeCurrent(_eglSurface);
_eglDisplay.GlInterface.ClearColor(0, 0, 0, 0);
_eglDisplay.GlInterface.Clear(GlConsts.GL_COLOR_BUFFER_BIT | GlConsts.GL_STENCIL_BUFFER_BIT);
_eglSurface.SwapBuffers();
var bo = gbm_surface_lock_front_buffer(_gbmTargetSurface);
var fbId = GetFbIdForBo(bo);
var connectorId = connector.Id;
var mode = modeInfo.Mode;
var res = drmModeSetCrtc(_card.Fd, _crtcId, fbId, 0, 0, &connectorId, 1, &mode);
if (res != 0)
{
throw new Win32Exception(res, "drmModeSetCrtc failed");
}
_mode = mode;
_currentBo = bo;
// Go trough two cycles of buffer swapping (there are render artifacts otherwise)
for (var c = 0; c < 2; c++)
{
using (CreateGlRenderTarget().BeginDraw())
{
_eglDisplay.GlInterface.ClearColor(0, 0, 0, 0);
_eglDisplay.GlInterface.Clear(GlConsts.GL_COLOR_BUFFER_BIT | GlConsts.GL_STENCIL_BUFFER_BIT);
}
}
}