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The surfaceless context extension can be used to bind a context without a surface. We can use this to avoid creating a dummy surface when the CoglContext is first created. Otherwise we have to have the dummy surface so that we can bind it before the first onscreen is created. The main awkward part of this patch is that theoretically according to the GL and GLES spec if you first bind a context without a surface then the default state for glDrawBuffers is GL_NONE instead of GL_BACK. In practice Mesa doesn't seem to do this but we need to be robust against a GL implementation that does. Therefore we track when the CoglContext is first used with a CoglOnscreen and force the glDrawBuffers state to be GL_BACK. There is a further awkward part in that GLES2 doesn't actually have a glDrawBuffers state but GLES3 does. GLES3 also defaults to GL_NONE in this case so if GLES3 is available then we have to be sure to set the state to GL_BACK. As far as I can tell that actually makes GLES3 incompatible with GLES2 because in theory if the application is not aware of GLES3 then it should be able to assume the draw buffer is always GL_BACK. Reviewed-by: Robert Bragg <robert.bragg@intel.com> (cherry picked from commit e5f28f1e75db9bdc4f2688f420a74f908f96cf76) Conflicts: cogl/winsys/cogl-winsys-egl-kms.c cogl/winsys/cogl-winsys-egl-x11.c
150 lines
6.2 KiB
C
150 lines
6.2 KiB
C
/*
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* Cogl
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*
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* A Low Level GPU Graphics and Utilities API
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*
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* Copyright (C) 2010 Intel Corporation.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*
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*/
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/* This can be included multiple times with different definitions for
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* the COGL_WINSYS_FEATURE_* functions.
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*/
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/* Macro prototypes:
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* COGL_WINSYS_FEATURE_BEGIN (name, namespaces, extension_names,
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* implied_private_egl_feature_flags)
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* COGL_WINSYS_FEATURE_FUNCTION (return_type, function_name,
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* (arguments))
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* ...
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* COGL_WINSYS_FEATURE_END ()
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*
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* Note: You can list multiple namespace and extension names if the
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* corresponding _FEATURE_FUNCTIONS have the same semantics accross
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* the different extension variants.
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*
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* XXX: NB: Don't add a trailing semicolon when using these macros
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*/
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COGL_WINSYS_FEATURE_BEGIN (swap_region,
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"NOK\0",
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"swap_region\0",
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COGL_EGL_WINSYS_FEATURE_SWAP_REGION)
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COGL_WINSYS_FEATURE_FUNCTION (EGLBoolean, eglSwapBuffersRegion,
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(EGLDisplay dpy,
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EGLSurface surface,
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EGLint numRects,
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const EGLint *rects))
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COGL_WINSYS_FEATURE_END ()
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/* XXX: These macros can't handle falling back to looking for
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* EGL_KHR_image if EGL_KHR_image_base and EGL_KHR_image_pixmap aren't
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* found... */
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#ifdef EGL_KHR_image_base
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COGL_WINSYS_FEATURE_BEGIN (image_base,
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"KHR\0",
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"image_base\0",
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0)
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COGL_WINSYS_FEATURE_FUNCTION (EGLImageKHR, eglCreateImage,
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(EGLDisplay dpy,
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EGLContext ctx,
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EGLenum target,
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EGLClientBuffer buffer,
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const EGLint *attrib_list))
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COGL_WINSYS_FEATURE_FUNCTION (EGLBoolean, eglDestroyImage,
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(EGLDisplay dpy,
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EGLImageKHR image))
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COGL_WINSYS_FEATURE_END ()
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#endif
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COGL_WINSYS_FEATURE_BEGIN (image_pixmap,
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"KHR\0",
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"image_pixmap\0",
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COGL_EGL_WINSYS_FEATURE_EGL_IMAGE_FROM_X11_PIXMAP)
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COGL_WINSYS_FEATURE_END ()
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#ifdef EGL_WL_bind_wayland_display
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COGL_WINSYS_FEATURE_BEGIN (bind_wayland_display,
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"WL\0",
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"bind_wayland_display\0",
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COGL_EGL_WINSYS_FEATURE_EGL_IMAGE_FROM_WAYLAND_BUFFER)
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COGL_WINSYS_FEATURE_FUNCTION (EGLImageKHR, eglBindWaylandDisplay,
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(EGLDisplay dpy,
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struct wl_display *wayland_display))
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COGL_WINSYS_FEATURE_FUNCTION (EGLBoolean, eglUnbindWaylandDisplay,
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(EGLDisplay dpy,
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struct wl_display *wayland_display))
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COGL_WINSYS_FEATURE_FUNCTION (EGLBoolean, eglQueryWaylandBuffer,
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(EGLDisplay dpy,
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struct wl_resource *buffer,
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EGLint attribute, EGLint *value))
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COGL_WINSYS_FEATURE_END ()
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#endif /* EGL_WL_bind_wayland_display */
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COGL_WINSYS_FEATURE_BEGIN (create_context,
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"KHR\0",
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"create_context\0",
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COGL_EGL_WINSYS_FEATURE_CREATE_CONTEXT)
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COGL_WINSYS_FEATURE_END ()
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COGL_WINSYS_FEATURE_BEGIN (buffer_age,
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"EXT\0",
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"buffer_age\0",
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COGL_EGL_WINSYS_FEATURE_BUFFER_AGE)
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COGL_WINSYS_FEATURE_END ()
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COGL_WINSYS_FEATURE_BEGIN (swap_buffers_with_damage,
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"EXT\0",
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"swap_buffers_with_damage\0",
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0)
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COGL_WINSYS_FEATURE_FUNCTION (EGLBoolean, eglSwapBuffersWithDamage,
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(EGLDisplay dpy,
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EGLSurface surface,
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const EGLint *rects,
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EGLint n_rects))
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COGL_WINSYS_FEATURE_END ()
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#if defined(EGL_KHR_fence_sync) || defined(EGL_KHR_reusable_sync)
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COGL_WINSYS_FEATURE_BEGIN (fence_sync,
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"KHR\0",
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"fence_sync\0",
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COGL_EGL_WINSYS_FEATURE_FENCE_SYNC)
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COGL_WINSYS_FEATURE_FUNCTION (EGLSyncKHR, eglCreateSync,
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(EGLDisplay dpy,
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EGLenum type,
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const EGLint *attrib_list))
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COGL_WINSYS_FEATURE_FUNCTION (EGLint, eglClientWaitSync,
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(EGLDisplay dpy,
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EGLSyncKHR sync,
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EGLint flags,
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EGLTimeKHR timeout))
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COGL_WINSYS_FEATURE_FUNCTION (EGLBoolean, eglDestroySync,
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(EGLDisplay dpy,
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EGLSyncKHR sync))
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COGL_WINSYS_FEATURE_END ()
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#endif
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COGL_WINSYS_FEATURE_BEGIN (surfaceless_context,
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"KHR\0",
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"surfaceless_context\0",
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COGL_EGL_WINSYS_FEATURE_SURFACELESS_CONTEXT)
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COGL_WINSYS_FEATURE_END ()
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