wlroots-hyprland/backend/drm/drm.c

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11 KiB
C
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2017-05-01 05:20:48 +02:00
#include "otd.h"
#include "drm.h"
#include "event.h"
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <errno.h>
#include <xf86drm.h>
#include <xf86drmMode.h>
#include <drm_mode.h>
#include <EGL/egl.h>
#include <EGL/eglext.h>
#include <gbm.h>
#include <GLES3/gl3.h>
static const char *conn_name[] = {
[DRM_MODE_CONNECTOR_Unknown] = "Unknown",
[DRM_MODE_CONNECTOR_VGA] = "VGA",
[DRM_MODE_CONNECTOR_DVII] = "DVI-I",
[DRM_MODE_CONNECTOR_DVID] = "DVI-D",
[DRM_MODE_CONNECTOR_DVIA] = "DVI-A",
[DRM_MODE_CONNECTOR_Composite] = "Composite",
[DRM_MODE_CONNECTOR_SVIDEO] = "SVIDEO",
[DRM_MODE_CONNECTOR_LVDS] = "LVDS",
[DRM_MODE_CONNECTOR_Component] = "Component",
[DRM_MODE_CONNECTOR_9PinDIN] = "DIN",
[DRM_MODE_CONNECTOR_DisplayPort] = "DP",
[DRM_MODE_CONNECTOR_HDMIA] = "HDMI-A",
[DRM_MODE_CONNECTOR_HDMIB] = "HDMI-B",
[DRM_MODE_CONNECTOR_TV] = "TV",
[DRM_MODE_CONNECTOR_eDP] = "eDP",
[DRM_MODE_CONNECTOR_VIRTUAL] = "Virtual",
[DRM_MODE_CONNECTOR_DSI] = "DSI",
};
// EGL extensions
PFNEGLGETPLATFORMDISPLAYEXTPROC get_platform_display;
PFNEGLCREATEPLATFORMWINDOWSURFACEEXTPROC create_platform_window_surface;
static bool egl_exts()
{
get_platform_display = (PFNEGLGETPLATFORMDISPLAYEXTPROC)
eglGetProcAddress("eglGetPlatformDisplayEXT");
create_platform_window_surface = (PFNEGLCREATEPLATFORMWINDOWSURFACEEXTPROC)
eglGetProcAddress("eglCreatePlatformWindowSurfaceEXT");
return get_platform_display && create_platform_window_surface;
}
bool egl_get_config(EGLDisplay disp, EGLConfig *out)
{
EGLint count = 0, matched = 0, ret;
ret = eglGetConfigs(disp, NULL, 0, &count);
if (ret == EGL_FALSE || count == 0) {
return false;
}
EGLConfig configs[count];
ret = eglChooseConfig(disp, NULL, configs, count, &matched);
if (ret == EGL_FALSE) {
return false;
}
for (int i = 0; i < matched; ++i) {
EGLint gbm_format;
if (!eglGetConfigAttrib(disp,
configs[i],
EGL_NATIVE_VISUAL_ID,
&gbm_format))
continue;
if (gbm_format == GBM_FORMAT_XRGB8888) {
*out = configs[i];
return true;
}
}
return false;
}
bool init_renderer(struct otd *otd)
{
if (!egl_exts()) {
fprintf(stderr, "Could not get EGL extensions\n");
return false;
}
otd->gbm = gbm_create_device(otd->fd);
if (!otd->gbm) {
fprintf(stderr, "Could not create gbm device: %s\n", strerror(errno));
return false;
}
if (eglBindAPI(EGL_OPENGL_ES_API) == EGL_FALSE) {
fprintf(stderr, "Could not bind GLES3 API\n");
goto error_gbm;
}
otd->egl.disp = get_platform_display(EGL_PLATFORM_GBM_MESA, otd->gbm, NULL);
if (otd->egl.disp == EGL_NO_DISPLAY) {
fprintf(stderr, "Could not create EGL display\n");
goto error_gbm;
}
if (eglInitialize(otd->egl.disp, NULL, NULL) == EGL_FALSE) {
fprintf(stderr, "Could not initalise EGL\n");
goto error_egl;
}
if (!egl_get_config(otd->egl.disp, &otd->egl.conf)) {
fprintf(stderr, "Could not get EGL config\n");
goto error_egl;
}
static const EGLint attribs[] = {EGL_CONTEXT_CLIENT_VERSION, 3, EGL_NONE};
otd->egl.context = eglCreateContext(otd->egl.disp, otd->egl.conf, EGL_NO_CONTEXT, attribs);
if (otd->egl.context == EGL_NO_CONTEXT) {
fprintf(stderr, "Could not create EGL context\n");
goto error_egl;
}
return true;
error_egl:
eglTerminate(otd->egl.disp);
eglReleaseThread();
eglMakeCurrent(EGL_NO_DISPLAY, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
error_gbm:
gbm_device_destroy(otd->gbm);
return false;
}
void destroy_renderer(struct otd *otd)
{
if (!otd)
return;
eglDestroyContext(otd->egl.disp, otd->egl.context);
eglTerminate(otd->egl.disp);
eglReleaseThread();
eglMakeCurrent(EGL_NO_DISPLAY, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
gbm_device_destroy(otd->gbm);
}
void scan_connectors(struct otd *otd)
{
drmModeRes *res = drmModeGetResources(otd->fd);
if (!res)
return;
// I don't know if this needs to be allocated with realloc like this,
// as it may not even be possible for the number of connectors to change.
// I'll just have to see how DisplayPort MST works with DRM.
if ((size_t)res->count_connectors > otd->display_len) {
struct otd_display *new = realloc(otd->displays, sizeof *new * res->count_connectors);
if (!new)
goto error;
for (int i = otd->display_len; i < res->count_connectors; ++i) {
new[i] = (struct otd_display) {
.state = OTD_DISP_INVALID,
.otd = otd,
};
}
otd->display_len = res->count_connectors;
otd->displays = new;
}
for (int i = 0; i < res->count_connectors; ++i) {
struct otd_display *disp = &otd->displays[i];
drmModeConnector *conn = drmModeGetConnector(otd->fd, res->connectors[i]);
if (!conn)
continue;
if (otd->displays[i].state == OTD_DISP_INVALID) {
disp->state = OTD_DISP_DISCONNECTED;
disp->connector = res->connectors[i];
snprintf(disp->name, sizeof disp->name, "%s-%"PRIu32,
conn_name[conn->connector_type],
conn->connector_type_id);
}
if (disp->state == OTD_DISP_DISCONNECTED &&
conn->connection == DRM_MODE_CONNECTED) {
disp->state = OTD_DISP_NEEDS_MODESET;
event_add(otd, disp, OTD_EV_DISPLAY_ADD);
} else if (disp->state == OTD_DISP_CONNECTED &&
conn->connection != DRM_MODE_CONNECTED) {
disp->state = OTD_DISP_DISCONNECTED;
event_add(otd, disp, OTD_EV_DISPLAY_REM);
}
drmModeFreeConnector(conn);
}
error:
drmModeFreeResources(res);
}
static void free_fb(struct gbm_bo *bo, void *data)
{
uint32_t *id = data;
if (id && *id)
drmModeRmFB(gbm_bo_get_fd(bo), *id);
free(id);
}
static uint32_t get_fb_for_bo(int fd, struct gbm_bo *bo)
{
uint32_t *id = gbm_bo_get_user_data(bo);
if (id)
return *id;
id = calloc(1, sizeof *id);
if (!id)
return 0;
drmModeAddFB(fd, gbm_bo_get_width(bo), gbm_bo_get_height(bo), 24, 32,
gbm_bo_get_stride(bo), gbm_bo_get_handle(bo).u32, id);
gbm_bo_set_user_data(bo, id, free_fb);
return *id;
}
static void init_display_renderer(struct otd *otd, struct otd_display *disp)
{
disp->gbm = gbm_surface_create(otd->gbm,
disp->width, disp->height,
GBM_FORMAT_XRGB8888,
GBM_BO_USE_SCANOUT | GBM_BO_USE_RENDERING);
if (!disp->gbm)
return;
disp->egl = create_platform_window_surface(otd->egl.disp, otd->egl.conf,
disp->gbm, NULL);
if (disp->egl == EGL_NO_SURFACE)
return;
// Render black frame
eglMakeCurrent(otd->egl.disp, disp->egl, disp->egl, otd->egl.context);
glViewport(0, 0, disp->width, disp->height);
glClearColor(0.0, 0.0, 0.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
eglSwapBuffers(otd->egl.disp, disp->egl);
struct gbm_bo *bo = gbm_surface_lock_front_buffer(disp->gbm);
uint32_t fb_id = get_fb_for_bo(otd->fd, bo);
drmModeSetCrtc(otd->fd, disp->crtc, fb_id, 0, 0,
&disp->connector, 1, disp->active_mode);
drmModePageFlip(otd->fd, disp->crtc, fb_id, DRM_MODE_PAGE_FLIP_EVENT, disp);
gbm_surface_release_buffer(disp->gbm, bo);
}
static drmModeModeInfo *select_mode(size_t num_modes,
drmModeModeInfo modes[static num_modes],
drmModeCrtc *old_crtc,
const char *str)
{
if (strcmp(str, "preferred") == 0)
return &modes[0];
if (strcmp(str, "current") == 0) {
if (!old_crtc) {
fprintf(stderr, "Display does not have currently configured mode\n");
return NULL;
}
for (size_t i = 0; i < num_modes; ++i) {
if (memcmp(&modes[i], &old_crtc->mode, sizeof modes[0]) == 0)
return &modes[i];
}
// We should never get here
assert(0);
}
unsigned width = 0;
unsigned height = 0;
unsigned rate = 0;
int ret;
if ((ret = sscanf(str, "%ux%u@%u", &width, &height, &rate)) != 2 && ret != 3) {
fprintf(stderr, "Invalid modesetting string\n");
return NULL;
}
for (size_t i = 0; i < num_modes; ++i) {
if (modes[i].hdisplay == width &&
modes[i].vdisplay == height &&
(!rate || modes[i].vrefresh == rate))
return &modes[i];
}
return NULL;
}
bool modeset_str(struct otd *otd, struct otd_display *disp, const char *str)
{
drmModeConnector *conn = drmModeGetConnector(otd->fd, disp->connector);
if (!conn || conn->connection != DRM_MODE_CONNECTED || conn->count_modes == 0)
goto error;
disp->num_modes = conn->count_modes;
disp->modes = malloc(sizeof *disp->modes * disp->num_modes);
if (!disp->modes)
goto error;
memcpy(disp->modes, conn->modes, sizeof *disp->modes * disp->num_modes);
drmModeEncoder *curr_enc = drmModeGetEncoder(otd->fd, conn->encoder_id);
if (curr_enc) {
disp->old_crtc = drmModeGetCrtc(otd->fd, curr_enc->crtc_id);
free(curr_enc);
}
disp->active_mode = select_mode(disp->num_modes, disp->modes, disp->old_crtc, str);
if (!disp->active_mode) {
fprintf(stderr, "Could not find mode '%s' for %s\n", str, disp->name);
goto error;
}
fprintf(stderr, "Configuring %s with mode %ux%u@%u\n",
disp->name, disp->active_mode->hdisplay, disp->active_mode->vdisplay,
disp->active_mode->vrefresh);
drmModeRes *res = drmModeGetResources(otd->fd);
if (!res)
goto error;
bool success = false;
for (int i = 0; !success && i < conn->count_encoders; ++i) {
drmModeEncoder *enc = drmModeGetEncoder(otd->fd, conn->encoders[i]);
if (!enc)
continue;
for (int j = 0; j < res->count_crtcs; ++j) {
if ((enc->possible_crtcs & (1 << j)) == 0)
continue;
if ((otd->taken_crtcs & (1 << j)) == 0) {
otd->taken_crtcs |= 1 << j;
disp->crtc = res->crtcs[j];
success = true;
break;
}
}
drmModeFreeEncoder(enc);
}
drmModeFreeResources(res);
if (!success)
goto error;
disp->state = OTD_DISP_CONNECTED;
drmModeFreeConnector(conn);
disp->width = disp->active_mode->hdisplay;
disp->height = disp->active_mode->vdisplay;
init_display_renderer(otd, disp);
return true;
error:
disp->state = OTD_DISP_DISCONNECTED;
drmModeFreeConnector(conn);
event_add(otd, disp, OTD_EV_DISPLAY_REM);
return false;
}
void page_flip_handler(int fd,
unsigned seq,
unsigned tv_sec,
unsigned tv_usec,
void *user)
{
struct otd_display *disp = user;
disp->pageflip_pending = true;
if (!disp->cleanup)
event_add(disp->otd, disp, OTD_EV_RENDER);
}
void destroy_display_renderer(struct otd *otd, struct otd_display *disp)
{
if (!otd || !disp || disp->state != OTD_DISP_CONNECTED)
return;
drmModeCrtc *crtc = disp->old_crtc;
if (crtc) {
drmEventContext event = {
.version = DRM_EVENT_CONTEXT_VERSION,
.page_flip_handler = page_flip_handler,
};
disp->cleanup = true;
while (disp->pageflip_pending)
drmHandleEvent(otd->fd, &event);
drmModeSetCrtc(otd->fd, crtc->crtc_id, crtc->buffer_id,
crtc->x, crtc->y, &disp->connector,
1, &crtc->mode);
drmModeFreeCrtc(crtc);
}
eglDestroySurface(otd->egl.disp, disp->egl);
gbm_surface_destroy(disp->gbm);
free(disp->modes);
}
void get_drm_event(struct otd *otd)
{
drmEventContext event = {
.version = DRM_EVENT_CONTEXT_VERSION,
.page_flip_handler = page_flip_handler,
};
drmHandleEvent(otd->fd, &event);
}
void rendering_begin(struct otd_display *disp)
{
struct otd *otd = disp->otd;
eglMakeCurrent(otd->egl.disp, disp->egl, disp->egl, otd->egl.context);
}
void rendering_end(struct otd_display *disp)
{
struct otd *otd = disp->otd;
eglSwapBuffers(otd->egl.disp, disp->egl);
struct gbm_bo *bo = gbm_surface_lock_front_buffer(disp->gbm);
uint32_t fb_id = get_fb_for_bo(otd->fd, bo);
drmModePageFlip(otd->fd, disp->crtc, fb_id, DRM_MODE_PAGE_FLIP_EVENT, disp);
gbm_surface_release_buffer(disp->gbm, bo);
disp->pageflip_pending = false;
}