libmks/lib/mks-gl-context.c

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/*
* mks-gl-context.c
*
* Copyright 2023 Christian Hergert <chergert@redhat.com>
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of the
* License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#include "config.h"
#include <gdk/gdk.h>
#ifdef GDK_WINDOWING_WAYLAND
# include <gdk/wayland/gdkwayland.h>
#endif
#ifdef GDK_WINDOWING_X11
# include <gdk/x11/gdkx.h>
#endif
#include "mks-gl-context-private.h"
GLuint
mks_gl_context_import_dmabuf (GdkGLContext *context,
guint32 format,
guint width,
guint height,
guint32 n_planes,
const int *fds,
const guint32 *strides,
const guint32 *offsets,
const guint64 *modifiers)
{
GdkDisplay *display;
EGLDisplay egl_display;
EGLint attribs[2 * (3 + 4 * 5) + 1];
EGLImage image;
guint texture_id;
int i;
g_return_val_if_fail (GDK_IS_GL_CONTEXT (context), 0);
g_return_val_if_fail (0 < n_planes && n_planes <= 4, 0);
display = gdk_gl_context_get_display (context);
#ifdef GDK_WINDOWING_WAYLAND
if (GDK_IS_WAYLAND_DISPLAY (display))
egl_display = gdk_wayland_display_get_egl_display (display);
else
#endif
#ifdef GDK_WINDOWING_X11
if (GDK_IS_X11_DISPLAY (display))
egl_display = gdk_x11_display_get_egl_display (display);
else
#endif
egl_display = NULL;
if (egl_display == NULL)
{
g_warning ("Can't import dmabufs when not using EGL");
return 0;
}
i = 0;
attribs[i++] = EGL_WIDTH;
attribs[i++] = width;
attribs[i++] = EGL_HEIGHT;
attribs[i++] = height;
attribs[i++] = EGL_LINUX_DRM_FOURCC_EXT;
attribs[i++] = format;
if (n_planes > 0)
{
attribs[i++] = EGL_DMA_BUF_PLANE0_FD_EXT;
attribs[i++] = fds[0];
attribs[i++] = EGL_DMA_BUF_PLANE0_OFFSET_EXT;
attribs[i++] = offsets[0];
attribs[i++] = EGL_DMA_BUF_PLANE0_PITCH_EXT;
attribs[i++] = strides[0];
if (modifiers)
{
attribs[i++] = EGL_DMA_BUF_PLANE0_MODIFIER_LO_EXT;
attribs[i++] = modifiers[0] & 0xFFFFFFFF;
attribs[i++] = EGL_DMA_BUF_PLANE0_MODIFIER_HI_EXT;
attribs[i++] = modifiers[0] >> 32;
}
}
if (n_planes > 1)
{
attribs[i++] = EGL_DMA_BUF_PLANE1_FD_EXT;
attribs[i++] = fds[1];
attribs[i++] = EGL_DMA_BUF_PLANE1_OFFSET_EXT;
attribs[i++] = offsets[1];
attribs[i++] = EGL_DMA_BUF_PLANE1_PITCH_EXT;
attribs[i++] = strides[1];
if (modifiers)
{
attribs[i++] = EGL_DMA_BUF_PLANE1_MODIFIER_LO_EXT;
attribs[i++] = modifiers[1] & 0xFFFFFFFF;
attribs[i++] = EGL_DMA_BUF_PLANE1_MODIFIER_HI_EXT;
attribs[i++] = modifiers[1] >> 32;
}
}
if (n_planes > 2)
{
attribs[i++] = EGL_DMA_BUF_PLANE2_FD_EXT;
attribs[i++] = fds[2];
attribs[i++] = EGL_DMA_BUF_PLANE2_OFFSET_EXT;
attribs[i++] = offsets[2];
attribs[i++] = EGL_DMA_BUF_PLANE2_PITCH_EXT;
attribs[i++] = strides[2];
if (modifiers)
{
attribs[i++] = EGL_DMA_BUF_PLANE2_MODIFIER_LO_EXT;
attribs[i++] = modifiers[2] & 0xFFFFFFFF;
attribs[i++] = EGL_DMA_BUF_PLANE2_MODIFIER_HI_EXT;
attribs[i++] = modifiers[2] >> 32;
}
}
if (n_planes > 3)
{
attribs[i++] = EGL_DMA_BUF_PLANE3_FD_EXT;
attribs[i++] = fds[3];
attribs[i++] = EGL_DMA_BUF_PLANE3_OFFSET_EXT;
attribs[i++] = offsets[3];
attribs[i++] = EGL_DMA_BUF_PLANE3_PITCH_EXT;
attribs[i++] = strides[3];
if (modifiers)
{
attribs[i++] = EGL_DMA_BUF_PLANE3_MODIFIER_LO_EXT;
attribs[i++] = modifiers[3] & 0xFFFFFFFF;
attribs[i++] = EGL_DMA_BUF_PLANE3_MODIFIER_HI_EXT;
attribs[i++] = modifiers[3] >> 32;
}
}
attribs[i++] = EGL_NONE;
image = eglCreateImageKHR (egl_display,
EGL_NO_CONTEXT,
EGL_LINUX_DMA_BUF_EXT,
(EGLClientBuffer)NULL,
attribs);
if (image == EGL_NO_IMAGE)
{
g_warning ("Failed to create EGL image: %d\n", eglGetError ());
return 0;
}
gdk_gl_context_make_current (context);
glGenTextures (1, &texture_id);
glBindTexture (GL_TEXTURE_2D, texture_id);
glEGLImageTargetTexture2DOES (GL_TEXTURE_2D, image);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
eglDestroyImageKHR (egl_display, image);
return texture_id;
}