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RetroArch/gfx/context/drm_egl_ctx.c

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/* RetroArch - A frontend for libretro.
* Copyright (C) 2010-2014 - Hans-Kristian Arntzen
* Copyright (C) 2011-2014 - Daniel De Matteis
*
* RetroArch is free software: you can redistribute it and/or modify it under the terms
* of the GNU General Public License as published by the Free Software Found-
* ation, either version 3 of the License, or (at your option) any later version.
*
* RetroArch 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with RetroArch.
* If not, see <http://www.gnu.org/licenses/>.
*/
// KMS/DRM context, running without any window manager.
// Based on kmscube example by Rob Clark.
#include "../../driver.h"
#include "../gfx_context.h"
#include "../gl_common.h"
#include "../gfx_common.h"
#include "../../file_path.h"
#ifdef HAVE_CONFIG_H
#include "../../config.h"
#endif
#include <errno.h>
#include <signal.h>
#include <stdint.h>
#include <signal.h>
#include <unistd.h>
#include <sched.h>
#include <sys/time.h>
#include <EGL/egl.h>
#include <EGL/eglext.h>
#include <libdrm/drm.h>
#include <xf86drm.h>
#include <xf86drmMode.h>
#include <gbm.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/poll.h>
#include <fcntl.h>
#ifndef EGL_OPENGL_ES3_BIT_KHR
#define EGL_OPENGL_ES3_BIT_KHR 0x0040
#endif
static bool g_use_hw_ctx;
static EGLContext g_egl_hw_ctx;
static EGLContext g_egl_ctx;
static EGLSurface g_egl_surf;
static EGLDisplay g_egl_dpy;
static EGLConfig g_config;
static volatile sig_atomic_t g_quit;
static bool g_inited;
static unsigned g_interval;
static enum gfx_ctx_api g_api;
static unsigned g_major;
static unsigned g_minor;
static struct gbm_device *g_gbm_dev;
static struct gbm_surface *g_gbm_surface;
static int g_drm_fd;
static drmModeModeInfo *g_drm_mode;
static uint32_t g_crtc_id;
static uint32_t g_connector_id;
static drmModeCrtcPtr g_orig_crtc;
static unsigned g_fb_width; // Just use something for now.
static unsigned g_fb_height;
static struct gbm_bo *g_bo, *g_next_bo;
static drmModeRes *g_resources;
static drmModeConnector *g_connector;
static drmModeEncoder *g_encoder;
struct drm_fb
{
struct gbm_bo *bo;
uint32_t fb_id;
};
static struct drm_fb *drm_fb_get_from_bo(struct gbm_bo *bo);
static void gfx_ctx_destroy(void *data);
static void sighandler(int sig)
{
(void)sig;
g_quit = 1;
}
static void gfx_ctx_swap_interval(void *data, unsigned interval)
{
(void)data;
g_interval = interval;
if (interval > 1)
RARCH_WARN("[KMS/EGL]: Swap intervals > 1 currently not supported. Will use swap interval of 1.\n");
}
static void gfx_ctx_check_window(void *data, bool *quit,
bool *resize, unsigned *width, unsigned *height, unsigned frame_count)
{
(void)data;
(void)frame_count;
(void)width;
(void)height;
*resize = false;
*quit = g_quit;
}
static unsigned first_page_flip;
static unsigned last_page_flip;
static void page_flip_handler(int fd, unsigned frame, unsigned sec, unsigned usec, void *data)
{
(void)fd;
(void)sec;
(void)usec;
if (!first_page_flip)
first_page_flip = frame;
if (last_page_flip)
{
unsigned missed = frame - last_page_flip - 1;
if (missed)
RARCH_LOG("[KMS/EGL]: Missed %u VBlank(s) (Frame: %u, DRM frame: %u).\n",
missed, frame - first_page_flip, frame);
}
last_page_flip = frame;
*(bool*)data = false;
}
static bool waiting_for_flip;
static void wait_flip(bool block)
{
struct pollfd fds = {0};
fds.fd = g_drm_fd;
fds.events = POLLIN;
drmEventContext evctx = {0};
evctx.version = DRM_EVENT_CONTEXT_VERSION;
evctx.page_flip_handler = page_flip_handler;
int timeout = block ? -1 : 0;
while (waiting_for_flip)
{
fds.revents = 0;
if (poll(&fds, 1, timeout) < 0)
break;
if (fds.revents & (POLLHUP | POLLERR))
break;
if (fds.revents & POLLIN)
drmHandleEvent(g_drm_fd, &evctx);
else
break;
}
if (!waiting_for_flip) // Page flip has taken place.
{
gbm_surface_release_buffer(g_gbm_surface, g_bo); // This buffer is not on-screen anymore. Release it to GBM.
g_bo = g_next_bo; // This buffer is being shown now.
}
}
static void queue_flip(void)
{
g_next_bo = gbm_surface_lock_front_buffer(g_gbm_surface);
struct drm_fb *fb = drm_fb_get_from_bo(g_next_bo);
int ret = drmModePageFlip(g_drm_fd, g_crtc_id, fb->fb_id,
DRM_MODE_PAGE_FLIP_EVENT, &waiting_for_flip);
if (ret < 0)
{
RARCH_ERR("[KMS/EGL]: Failed to queue page flip.\n");
return;
}
waiting_for_flip = true;
}
static void gfx_ctx_swap_buffers(void *data)
{
(void)data;
eglSwapBuffers(g_egl_dpy, g_egl_surf);
// I guess we have to wait for flip to have taken place before another flip can be queued up.
if (waiting_for_flip)
{
wait_flip(g_interval);
if (waiting_for_flip) // We are still waiting for a flip (nonblocking mode, just drop the frame).
return;
}
queue_flip();
// We have to wait for this flip to finish. This shouldn't happen as we have triple buffered page-flips.
if (!gbm_surface_has_free_buffers(g_gbm_surface))
{
RARCH_WARN("[KMS/EGL]: Triple buffering is not working correctly ...\n");
wait_flip(true);
}
}
static void gfx_ctx_set_resize(void *data, unsigned width, unsigned height)
{
(void)data;
(void)width;
(void)height;
}
static void gfx_ctx_update_window_title(void *data)
{
(void)data;
char buf[128], buf_fps[128];
bool fps_draw = g_settings.fps_show;
gfx_get_fps(buf, sizeof(buf), fps_draw ? buf_fps : NULL, sizeof(buf_fps));
if (fps_draw)
msg_queue_push(g_extern.msg_queue, buf_fps, 1, 1);
}
static void gfx_ctx_get_video_size(void *data, unsigned *width, unsigned *height)
{
(void)data;
*width = g_fb_width;
*height = g_fb_height;
}
static void free_drm_resources(void)
{
if (g_gbm_surface)
gbm_surface_destroy(g_gbm_surface);
if (g_gbm_dev)
gbm_device_destroy(g_gbm_dev);
if (g_encoder)
drmModeFreeEncoder(g_encoder);
if (g_connector)
drmModeFreeConnector(g_connector);
if (g_resources)
drmModeFreeResources(g_resources);
if (g_orig_crtc)
drmModeFreeCrtc(g_orig_crtc);
if (g_drm_fd >= 0)
close(g_drm_fd);
g_gbm_surface = NULL;
g_gbm_dev = NULL;
g_encoder = NULL;
g_connector = NULL;
g_resources = NULL;
g_orig_crtc = NULL;
g_drm_fd = -1;
}
static bool gfx_ctx_init(void *data)
{
int i;
unsigned monitor_index;
unsigned gpu_index = 0;
unsigned monitor = max(g_settings.video.monitor_index, 1);
const char *gpu;
if (g_inited)
return false;
g_drm_fd = -1;
struct string_list *gpu_descriptors = dir_list_new("/dev/dri", NULL, false);
nextgpu:
free_drm_resources();
if (!gpu_descriptors || gpu_index == gpu_descriptors->size)
{
RARCH_ERR("[KMS/EGL]: Couldn't find a suitable DRM device.\n");
goto error;
}
gpu = gpu_descriptors->elems[gpu_index++].data;
g_drm_fd = open(gpu, O_RDWR);
if (g_drm_fd < 0)
{
RARCH_WARN("[KMS/EGL]: Couldn't open DRM device.\n");
goto nextgpu;
}
g_resources = drmModeGetResources(g_drm_fd);
if (!g_resources)
{
RARCH_WARN("[KMS/EGL]: Couldn't get device resources.\n");
goto nextgpu;
}
// Enumerate all connectors.
monitor_index = 0;
RARCH_LOG("[KMS/EGL]: Found %d connectors.\n", g_resources->count_connectors);
for (i = 0; i < g_resources->count_connectors; i++)
{
drmModeConnectorPtr conn = drmModeGetConnector(g_drm_fd, g_resources->connectors[i]);
if (conn)
{
bool connected = conn->connection == DRM_MODE_CONNECTED;
RARCH_LOG("[KMS/EGL]: Connector %d connected: %s\n", i, connected ? "yes" : "no");
RARCH_LOG("[KMS/EGL]: Connector %d has %d modes.\n", i, conn->count_modes);
if (connected && conn->count_modes > 0)
{
monitor_index++;
RARCH_LOG("[KMS/EGL]: Connector %d assigned to monitor index: #%u.\n", i, monitor_index);
}
drmModeFreeConnector(conn);
}
}
monitor_index = 0;
for (i = 0; i < g_resources->count_connectors; i++)
{
g_connector = drmModeGetConnector(g_drm_fd, g_resources->connectors[i]);
if (!g_connector)
continue;
if (g_connector->connection == DRM_MODE_CONNECTED && g_connector->count_modes > 0)
{
monitor_index++;
if (monitor_index == monitor)
break;
}
drmModeFreeConnector(g_connector);
g_connector = NULL;
}
if (!g_connector)
{
RARCH_WARN("[KMS/EGL]: Couldn't get device connector.\n");
goto nextgpu;
}
for (i = 0; i < g_resources->count_encoders; i++)
{
g_encoder = drmModeGetEncoder(g_drm_fd, g_resources->encoders[i]);
if (!g_encoder)
continue;
if (g_encoder->encoder_id == g_connector->encoder_id)
break;
drmModeFreeEncoder(g_encoder);
g_encoder = NULL;
}
if (!g_encoder)
{
RARCH_WARN("[KMS/EGL]: Couldn't find DRM encoder.\n");
goto nextgpu;
}
for (i = 0; i < g_connector->count_modes; i++)
{
RARCH_LOG("[KMS/EGL]: Mode %d: (%s) %d x %d, %u Hz\n", i,
g_connector->modes[i].name,
g_connector->modes[i].hdisplay, g_connector->modes[i].vdisplay,
g_connector->modes[i].vrefresh);
}
g_crtc_id = g_encoder->crtc_id;
g_orig_crtc = drmModeGetCrtc(g_drm_fd, g_crtc_id);
if (!g_orig_crtc)
RARCH_WARN("[KMS/EGL]: Cannot find original CRTC.\n");
g_connector_id = g_connector->connector_id;
// First mode is assumed to be the "optimal" one for get_video_size() purposes.
g_fb_width = g_connector->modes[0].hdisplay;
g_fb_height = g_connector->modes[0].vdisplay;
g_gbm_dev = gbm_create_device(g_drm_fd);
if (!g_gbm_dev)
{
RARCH_WARN("[KMS/EGL]: Couldn't create GBM device.\n");
goto nextgpu;
}
dir_list_free(gpu_descriptors);
return true;
error:
dir_list_free(gpu_descriptors);
gfx_ctx_destroy(data);
return false;
}
static void drm_fb_destroy_callback(struct gbm_bo *bo, void *data)
{
struct drm_fb *fb = (struct drm_fb*)data;
if (fb->fb_id)
drmModeRmFB(g_drm_fd, fb->fb_id);
free(fb);
}
static struct drm_fb *drm_fb_get_from_bo(struct gbm_bo *bo)
{
struct drm_fb *fb = (struct drm_fb*)gbm_bo_get_user_data(bo);
if (fb)
return fb;
fb = (struct drm_fb*)calloc(1, sizeof(*fb));
fb->bo = bo;
unsigned width = gbm_bo_get_width(bo);
unsigned height = gbm_bo_get_height(bo);
unsigned stride = gbm_bo_get_stride(bo);
unsigned handle = gbm_bo_get_handle(bo).u32;
RARCH_LOG("[KMS/EGL]: New FB: %ux%u (stride: %u).\n", width, height, stride);
int ret = drmModeAddFB(g_drm_fd, width, height, 24, 32, stride, handle, &fb->fb_id);
if (ret < 0)
{
RARCH_ERR("[KMS/EGL]: Failed to create FB: %s\n", strerror(errno));
free(fb);
return NULL;
}
gbm_bo_set_user_data(bo, fb, drm_fb_destroy_callback);
return fb;
}
static EGLint *egl_fill_attribs(EGLint *attr)
{
switch (g_api)
{
#ifdef EGL_KHR_create_context
case GFX_CTX_OPENGL_API:
{
unsigned version = g_major * 1000 + g_minor;
bool core = version >= 3001;
#ifdef GL_DEBUG
bool debug = true;
#else
bool debug = g_extern.system.hw_render_callback.debug_context;
#endif
if (core)
{
*attr++ = EGL_CONTEXT_MAJOR_VERSION_KHR;
*attr++ = g_major;
*attr++ = EGL_CONTEXT_MINOR_VERSION_KHR;
*attr++ = g_minor;
// Technically, we don't have core/compat until 3.2.
// Version 3.1 is either compat or not depending on GL_ARB_compatibility.
if (version >= 3002)
{
*attr++ = EGL_CONTEXT_OPENGL_PROFILE_MASK_KHR;
*attr++ = EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT_KHR;
}
}
if (debug)
{
*attr++ = EGL_CONTEXT_FLAGS_KHR;
*attr++ = EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR;
}
break;
}
#endif
case GFX_CTX_OPENGL_ES_API:
*attr++ = EGL_CONTEXT_CLIENT_VERSION;
*attr++ = g_major ? (EGLint)g_major : 2;
#ifdef EGL_KHR_create_context
if (g_minor > 0)
{
*attr++ = EGL_CONTEXT_MINOR_VERSION_KHR;
*attr++ = g_minor;
}
#endif
break;
default:
break;
}
*attr = EGL_NONE;
return attr;
}
static bool gfx_ctx_set_video_mode(void *data,
unsigned width, unsigned height,
bool fullscreen)
{
if (g_inited)
return false;
int i;
int ret = 0;
struct drm_fb *fb = NULL;
struct sigaction sa = {{0}};
sa.sa_handler = sighandler;
sa.sa_flags = SA_RESTART;
sigemptyset(&sa.sa_mask);
sigaction(SIGINT, &sa, NULL);
sigaction(SIGTERM, &sa, NULL);
#define EGL_ATTRIBS_BASE \
EGL_SURFACE_TYPE, EGL_WINDOW_BIT, \
EGL_RED_SIZE, 1, \
EGL_GREEN_SIZE, 1, \
EGL_BLUE_SIZE, 1, \
EGL_ALPHA_SIZE, 0, \
EGL_DEPTH_SIZE, 0
static const EGLint egl_attribs_gl[] = {
EGL_ATTRIBS_BASE,
EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT,
EGL_NONE,
};
static const EGLint egl_attribs_gles[] = {
EGL_ATTRIBS_BASE,
EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
EGL_NONE,
};
#ifdef EGL_KHR_create_context
static const EGLint egl_attribs_gles3[] = {
EGL_ATTRIBS_BASE,
EGL_RENDERABLE_TYPE, EGL_OPENGL_ES3_BIT_KHR,
EGL_NONE,
};
#endif
static const EGLint egl_attribs_vg[] = {
EGL_ATTRIBS_BASE,
EGL_RENDERABLE_TYPE, EGL_OPENVG_BIT,
EGL_NONE,
};
const EGLint *attrib_ptr;
switch (g_api)
{
case GFX_CTX_OPENGL_API:
attrib_ptr = egl_attribs_gl;
break;
case GFX_CTX_OPENGL_ES_API:
#ifdef EGL_KHR_create_context
if (g_major >= 3)
attrib_ptr = egl_attribs_gles3;
else
#endif
attrib_ptr = egl_attribs_gles;
break;
case GFX_CTX_OPENVG_API:
attrib_ptr = egl_attribs_vg;
break;
default:
attrib_ptr = NULL;
}
// Find desired video mode, and use that.
// If not fullscreen, we get desired windowed size, which is not appropriate.
if ((width == 0 && height == 0) || !fullscreen)
g_drm_mode = &g_connector->modes[0];
else
{
// Try to match g_settings.video.refresh_rate as closely as possible.
// Lower resolutions tend to have multiple supported refresh rates as well.
float minimum_fps_diff = 0.0f;
// Find best match.
for (i = 0; i < g_connector->count_modes; i++)
{
if (width != g_connector->modes[i].hdisplay || height != g_connector->modes[i].vdisplay)
continue;
if (!g_drm_mode)
{
g_drm_mode = &g_connector->modes[i];
minimum_fps_diff = g_drm_mode->vrefresh - g_settings.video.refresh_rate;
}
else
{
float diff = g_connector->modes[i].vrefresh - g_settings.video.refresh_rate;
if (diff < minimum_fps_diff)
{
g_drm_mode = &g_connector->modes[i];
minimum_fps_diff = diff;
}
}
}
}
if (!g_drm_mode)
{
RARCH_ERR("[KMS/EGL]: Did not find suitable video mode for %u x %u.\n", width, height);
goto error;
}
g_fb_width = g_drm_mode->hdisplay;
g_fb_height = g_drm_mode->vdisplay;
// Create GBM surface.
g_gbm_surface = gbm_surface_create(g_gbm_dev,
g_fb_width, g_fb_height,
GBM_FORMAT_XRGB8888,
GBM_BO_USE_SCANOUT | GBM_BO_USE_RENDERING);
if (!g_gbm_surface)
{
RARCH_ERR("[KMS/EGL]: Couldn't create GBM surface.\n");
goto error;
}
g_egl_dpy = eglGetDisplay((EGLNativeDisplayType)g_gbm_dev);
if (!g_egl_dpy)
{
RARCH_ERR("[KMS/EGL]: Couldn't get EGL display.\n");
goto error;
}
EGLint major, minor;
if (!eglInitialize(g_egl_dpy, &major, &minor))
goto error;
EGLint n;
if (!eglChooseConfig(g_egl_dpy, attrib_ptr, &g_config, 1, &n) || n != 1)
goto error;
EGLint egl_attribs[16];
EGLint *attr = egl_attribs;
attr = egl_fill_attribs(attr);
g_egl_ctx = eglCreateContext(g_egl_dpy, g_config, EGL_NO_CONTEXT,
attr != egl_attribs ? egl_attribs : NULL);
if (g_egl_ctx == EGL_NO_CONTEXT)
goto error;
if (g_use_hw_ctx)
{
g_egl_hw_ctx = eglCreateContext(g_egl_dpy, g_config, g_egl_ctx,
attr != egl_attribs ? egl_attribs : NULL);
RARCH_LOG("[KMS/EGL]: Created shared context: %p.\n", (void*)g_egl_hw_ctx);
if (g_egl_hw_ctx == EGL_NO_CONTEXT)
goto error;
}
g_egl_surf = eglCreateWindowSurface(g_egl_dpy, g_config, (EGLNativeWindowType)g_gbm_surface, NULL);
if (!g_egl_surf)
goto error;
if (!eglMakeCurrent(g_egl_dpy, g_egl_surf, g_egl_surf, g_egl_ctx))
goto error;
glClear(GL_COLOR_BUFFER_BIT);
eglSwapBuffers(g_egl_dpy, g_egl_surf);
g_bo = gbm_surface_lock_front_buffer(g_gbm_surface);
fb = drm_fb_get_from_bo(g_bo);
ret = drmModeSetCrtc(g_drm_fd, g_crtc_id, fb->fb_id, 0, 0, &g_connector_id, 1, g_drm_mode);
if (ret < 0)
goto error;
g_inited = true;
return true;
error:
gfx_ctx_destroy(data);
return false;
}
void gfx_ctx_destroy(void *data)
{
(void)data;
// Make sure we acknowledge all page-flips.
if (waiting_for_flip)
wait_flip(true);
if (g_egl_dpy)
{
if (g_egl_ctx)
{
eglMakeCurrent(g_egl_dpy, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
eglDestroyContext(g_egl_dpy, g_egl_ctx);
}
if (g_egl_hw_ctx)
eglDestroyContext(g_egl_dpy, g_egl_hw_ctx);
if (g_egl_surf)
eglDestroySurface(g_egl_dpy, g_egl_surf);
eglTerminate(g_egl_dpy);
}
// Be as careful as possible in deinit.
// If we screw up, the KMS tty will not restore.
g_egl_ctx = NULL;
g_egl_hw_ctx = NULL;
g_egl_surf = NULL;
g_egl_dpy = NULL;
g_config = 0;
// Restore original CRTC.
if (g_orig_crtc)
{
drmModeSetCrtc(g_drm_fd, g_orig_crtc->crtc_id,
g_orig_crtc->buffer_id,
g_orig_crtc->x,
g_orig_crtc->y,
&g_connector_id, 1, &g_orig_crtc->mode);
}
free_drm_resources();
g_drm_mode = NULL;
g_quit = 0;
g_crtc_id = 0;
g_connector_id = 0;
g_fb_width = 0;
g_fb_height = 0;
g_bo = NULL;
g_next_bo = NULL;
g_inited = false;
}
static void gfx_ctx_input_driver(void *data, const input_driver_t **input, void **input_data)
{
(void)data;
*input = NULL;
*input_data = NULL;
}
static bool gfx_ctx_has_focus(void *data)
{
(void)data;
return g_inited;
}
static gfx_ctx_proc_t gfx_ctx_get_proc_address(const char *symbol)
{
return eglGetProcAddress(symbol);
}
static bool gfx_ctx_bind_api(void *data, enum gfx_ctx_api api, unsigned major, unsigned minor)
{
(void)data;
g_major = major;
g_minor = minor;
g_api = api;
switch (api)
{
case GFX_CTX_OPENGL_API:
#ifndef EGL_KHR_create_context
if ((major * 1000 + minor) >= 3001)
return false;
#endif
return eglBindAPI(EGL_OPENGL_API);
case GFX_CTX_OPENGL_ES_API:
#ifndef EGL_KHR_create_context
if (major >= 3)
return false;
#endif
return eglBindAPI(EGL_OPENGL_ES_API);
case GFX_CTX_OPENVG_API:
return eglBindAPI(EGL_OPENVG_API);
default:
return false;
}
}
static void gfx_ctx_bind_hw_render(void *data, bool enable)
{
(void)data;
g_use_hw_ctx = enable;
if (g_egl_dpy && g_egl_surf)
eglMakeCurrent(g_egl_dpy, g_egl_surf, g_egl_surf, enable ? g_egl_hw_ctx : g_egl_ctx);
}
const gfx_ctx_driver_t gfx_ctx_drm_egl = {
gfx_ctx_init,
gfx_ctx_destroy,
gfx_ctx_bind_api,
gfx_ctx_swap_interval,
gfx_ctx_set_video_mode,
gfx_ctx_get_video_size,
NULL,
gfx_ctx_update_window_title,
gfx_ctx_check_window,
gfx_ctx_set_resize,
gfx_ctx_has_focus,
gfx_ctx_swap_buffers,
gfx_ctx_input_driver,
gfx_ctx_get_proc_address,
NULL,
NULL,
NULL,
"kms-egl",
gfx_ctx_bind_hw_render,
};
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