public OpenGLES()
{
mEglConfig = null;
mEglDisplay = EGL.NO_DISPLAY;
mEglContext = EGL.NO_CONTEXT;
Initialize();
}
public static EGLSurface CreateWindowSurface(
EGLDisplay dpy,
EGLConfig config,
object win,
int[] attrib_list)
{
return(new EGLSurface(eglCreateWindowSurface(dpy.Ptr, config.Ptr, win, attrib_list)));
}
public static int ChooseConfig(EGLDisplay dpy, int[] attrib_list, EGLConfig[] configs, ref int num_config)
{
var configPtrs = new IntPtr[configs.Length];
var result = eglChooseConfig(dpy.Ptr, attrib_list, configPtrs, configPtrs.Length, ref num_config);
for (var i = 0; i < configPtrs.Length; i++)
{
configs[i] = new EGLConfig(configPtrs[i]);
}
return(result);
}
public static EGLContext CreateContext(EGLDisplay dpy, EGLConfig config, EGLContext share_context, int[] attrib_list)
{
return(new EGLContext(eglCreateContext(dpy.Ptr, config.Ptr, share_context.Ptr, attrib_list)));
}
void Initialize()
{
int[] configAttributes =
{
EGL.RED_SIZE, 8,
EGL.GREEN_SIZE, 8,
EGL.BLUE_SIZE, 8,
EGL.ALPHA_SIZE, 8,
EGL.DEPTH_SIZE, 8,
EGL.STENCIL_SIZE, 8,
EGL.NONE
};
int[] contextAttributes =
{
EGL.CONTEXT_CLIENT_VERSION, 3,
EGL.NONE
};
int[] defaultDisplayAttributes =
{
// These are the default display attributes, used to request ANGLE's D3D11 renderer.
// eglInitialize will only succeed with these attributes if the hardware supports D3D11 Feature Level 10_0+.
EGL.PLATFORM_ANGLE_TYPE_ANGLE, EGL.PLATFORM_ANGLE_TYPE_D3D11_ANGLE,
// EGL.ANGLE_DISPLAY_ALLOW_RENDER_TO_BACK_BUFFER is an optimization that can have large performance benefits on mobile devices.
// Its syntax is subject to change, though. Please update your Visual Studio templates if you experience compilation issues with it.
EGL.ANGLE_DISPLAY_ALLOW_RENDER_TO_BACK_BUFFER, EGL.TRUE,
// EGL.PLATFORM_ANGLE_ENABLE_AUTOMATIC_TRIM_ANGLE is an option that enables ANGLE to automatically call
// the IDXGIDevice3::Trim method on behalf of the application when it gets suspended.
// Calling IDXGIDevice3::Trim when an application is suspended is a Windows Store application certification requirement.
EGL.PLATFORM_ANGLE_ENABLE_AUTOMATIC_TRIM_ANGLE, EGL.TRUE,
EGL.NONE,
};
int[] fl9_3DisplayAttributes =
{
// These can be used to request ANGLE's D3D11 renderer, with D3D11 Feature Level 9_3.
// These attributes are used if the call to eglInitialize fails with the default display attributes.
EGL.PLATFORM_ANGLE_TYPE_ANGLE, EGL.PLATFORM_ANGLE_TYPE_D3D11_ANGLE,
EGL.PLATFORM_ANGLE_MAX_VERSION_MAJOR_ANGLE, 9,
EGL.PLATFORM_ANGLE_MAX_VERSION_MINOR_ANGLE, 3,
EGL.ANGLE_DISPLAY_ALLOW_RENDER_TO_BACK_BUFFER, EGL.TRUE,
EGL.PLATFORM_ANGLE_ENABLE_AUTOMATIC_TRIM_ANGLE, EGL.TRUE,
EGL.NONE,
};
int[] warpDisplayAttributes =
{
// These attributes can be used to request D3D11 WARP.
// They are used if eglInitialize fails with both the default display attributes and the 9_3 display attributes.
EGL.PLATFORM_ANGLE_TYPE_ANGLE, EGL.PLATFORM_ANGLE_TYPE_D3D11_ANGLE,
EGL.PLATFORM_ANGLE_DEVICE_TYPE_ANGLE, EGL.PLATFORM_ANGLE_DEVICE_TYPE_WARP_ANGLE,
EGL.ANGLE_DISPLAY_ALLOW_RENDER_TO_BACK_BUFFER, EGL.TRUE,
EGL.PLATFORM_ANGLE_ENABLE_AUTOMATIC_TRIM_ANGLE, EGL.TRUE,
EGL.NONE,
};
//
// To initialize the display, we make three sets of calls to eglGetPlatformDisplayEXT and eglInitialize, with varying
// parameters passed to eglGetPlatformDisplayEXT:
// 1) The first calls uses "defaultDisplayAttributes" as a parameter. This corresponds to D3D11 Feature Level 10_0+.
// 2) If eglInitialize fails for step 1 (e.g. because 10_0+ isn't supported by the default GPU), then we try again
// using "fl9_3DisplayAttributes". This corresponds to D3D11 Feature Level 9_3.
// 3) If eglInitialize fails for step 2 (e.g. because 9_3+ isn't supported by the default GPU), then we try again
// using "warpDisplayAttributes". This corresponds to D3D11 Feature Level 11_0 on WARP, a D3D11 software rasterizer.
//
// This tries to initialize EGL to D3D11 Feature Level 10_0+. See above comment for details.
mEglDisplay =
EGL.GetPlatformDisplayEXT(EGL.PLATFORM_ANGLE_ANGLE, EGL.DEFAULT_DISPLAY, defaultDisplayAttributes);
if (mEglDisplay == EGL.NO_DISPLAY)
{
throw new ApplicationException("Failed to get EGL display");
}
int major = 0, minor = 0;
if (EGL.Initialize(mEglDisplay, ref major, ref minor) == EGL.FALSE)
{
// This tries to initialize EGL to D3D11 Feature Level 9_3, if 10_0+ is unavailable (e.g. on some mobile devices).
mEglDisplay = EGL.GetPlatformDisplayEXT(EGL.PLATFORM_ANGLE_ANGLE, EGL.DEFAULT_DISPLAY,
fl9_3DisplayAttributes);
if (mEglDisplay == EGL.NO_DISPLAY)
{
throw new ApplicationException("Failed to get EGL display");
}
if (EGL.Initialize(mEglDisplay, ref major, ref minor) == EGL.FALSE)
{
// This initializes EGL to D3D11 Feature Level 11_0 on WARP, if 9_3+ is unavailable on the default GPU.
mEglDisplay = EGL.GetPlatformDisplayEXT(EGL.PLATFORM_ANGLE_ANGLE, EGL.DEFAULT_DISPLAY,
warpDisplayAttributes);
if (mEglDisplay == EGL.NO_DISPLAY)
{
throw new ApplicationException("Failed to get EGL display");
}
if (EGL.Initialize(mEglDisplay, ref major, ref minor) == EGL.FALSE)
{
// If all of the calls to eglInitialize returned EGL.FALSE then an error has occurred.
throw new ApplicationException("Failed to initialize EGL");
}
}
}
int numConfigs = 0;
var eglConfig = new EGLConfig[1];
if ((EGL.ChooseConfig(mEglDisplay, configAttributes, eglConfig, ref numConfigs) == EGL.FALSE) ||
(numConfigs == 0))
{
throw new ApplicationException("Failed to choose first EGLConfig");
}
else
{
mEglConfig = eglConfig[0];
}
mEglContext = EGL.CreateContext(mEglDisplay, mEglConfig, EGL.NO_CONTEXT, contextAttributes);
if (mEglContext == EGL.NO_CONTEXT)
{
throw new ApplicationException("Failed to create EGL context");
}
}