wlroots/backend/drm/renderer.c

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#define _POSIX_C_SOURCE 200809L
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#include <assert.h>
#include <drm_fourcc.h>
#include <fcntl.h>
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#include <gbm.h>
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#include <stdbool.h>
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#include <stdlib.h>
#include <string.h>
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#include <unistd.h>
#include <wayland-util.h>
#include <wlr/render/gles2.h>
#include <wlr/render/wlr_renderer.h>
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#include <wlr/types/wlr_matrix.h>
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#include <wlr/util/log.h>
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#include "backend/drm/drm.h"
#include "backend/drm/util.h"
#include "render/drm_format_set.h"
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#include "render/gbm_allocator.h"
#include "render/swapchain.h"
#include "render/wlr_renderer.h"
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bool init_drm_renderer(struct wlr_drm_backend *drm,
struct wlr_drm_renderer *renderer) {
renderer->backend = drm;
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renderer->gbm = gbm_create_device(drm->fd);
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if (!renderer->gbm) {
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wlr_log(WLR_ERROR, "Failed to create GBM device");
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return false;
}
renderer->wlr_rend = wlr_renderer_autocreate(EGL_PLATFORM_GBM_KHR,
renderer->gbm);
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if (!renderer->wlr_rend) {
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wlr_log(WLR_ERROR, "Failed to create EGL/WLR renderer");
goto error_gbm;
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}
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int alloc_fd = fcntl(drm->fd, F_DUPFD_CLOEXEC, 0);
if (alloc_fd < 0) {
wlr_log_errno(WLR_ERROR, "fcntl(F_DUPFD_CLOEXEC) failed");
goto error_wlr_rend;
}
renderer->allocator = wlr_gbm_allocator_create(alloc_fd);
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if (renderer->allocator == NULL) {
wlr_log(WLR_ERROR, "Failed to create allocator");
close(alloc_fd);
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goto error_wlr_rend;
}
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return true;
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error_wlr_rend:
wlr_renderer_destroy(renderer->wlr_rend);
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error_gbm:
gbm_device_destroy(renderer->gbm);
return false;
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}
void finish_drm_renderer(struct wlr_drm_renderer *renderer) {
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if (!renderer) {
return;
}
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wlr_allocator_destroy(&renderer->allocator->base);
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wlr_renderer_destroy(renderer->wlr_rend);
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gbm_device_destroy(renderer->gbm);
}
static bool init_drm_surface(struct wlr_drm_surface *surf,
struct wlr_drm_renderer *renderer, uint32_t width, uint32_t height,
const struct wlr_drm_format *drm_format) {
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if (surf->width == width && surf->height == height) {
return true;
}
surf->renderer = renderer;
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surf->width = width;
surf->height = height;
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wlr_buffer_unlock(surf->back_buffer);
surf->back_buffer = NULL;
wlr_swapchain_destroy(surf->swapchain);
surf->swapchain = NULL;
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surf->swapchain = wlr_swapchain_create(&renderer->allocator->base,
width, height, drm_format);
if (surf->swapchain == NULL) {
wlr_log(WLR_ERROR, "Failed to create swapchain");
memset(surf, 0, sizeof(*surf));
return false;
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}
return true;
}
static void finish_drm_surface(struct wlr_drm_surface *surf) {
if (!surf || !surf->renderer) {
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return;
}
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wlr_buffer_unlock(surf->back_buffer);
wlr_swapchain_destroy(surf->swapchain);
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memset(surf, 0, sizeof(*surf));
}
bool drm_surface_make_current(struct wlr_drm_surface *surf,
int *buffer_age) {
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wlr_buffer_unlock(surf->back_buffer);
surf->back_buffer = wlr_swapchain_acquire(surf->swapchain, buffer_age);
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if (surf->back_buffer == NULL) {
wlr_log(WLR_ERROR, "Failed to acquire swapchain buffer");
return false;
}
struct wlr_egl *egl = wlr_gles2_renderer_get_egl(surf->renderer->wlr_rend);
if (!wlr_egl_make_current(egl, EGL_NO_SURFACE, NULL)) {
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return false;
}
if (!wlr_renderer_bind_buffer(surf->renderer->wlr_rend, surf->back_buffer)) {
wlr_log(WLR_ERROR, "Failed to attach buffer to renderer");
return false;
}
return true;
}
void drm_surface_unset_current(struct wlr_drm_surface *surf) {
assert(surf->back_buffer != NULL);
struct wlr_egl *egl = wlr_gles2_renderer_get_egl(surf->renderer->wlr_rend);
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wlr_renderer_bind_buffer(surf->renderer->wlr_rend, NULL);
wlr_egl_unset_current(egl);
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wlr_buffer_unlock(surf->back_buffer);
surf->back_buffer = NULL;
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}
static struct wlr_buffer *drm_surface_blit(struct wlr_drm_surface *surf,
struct wlr_buffer *buffer) {
struct wlr_renderer *renderer = surf->renderer->wlr_rend;
if (surf->width != (uint32_t)buffer->width ||
surf->height != (uint32_t)buffer->height) {
wlr_log(WLR_ERROR, "Surface size doesn't match buffer size");
return NULL;
}
struct wlr_dmabuf_attributes attribs = {0};
if (!wlr_buffer_get_dmabuf(buffer, &attribs)) {
return NULL;
}
struct wlr_texture *tex = wlr_texture_from_dmabuf(renderer, &attribs);
if (tex == NULL) {
return NULL;
}
if (!drm_surface_make_current(surf, NULL)) {
wlr_texture_destroy(tex);
return NULL;
}
float mat[9];
wlr_matrix_projection(mat, 1, 1, WL_OUTPUT_TRANSFORM_NORMAL);
wlr_renderer_begin(renderer, surf->width, surf->height);
wlr_renderer_clear(renderer, (float[]){ 0.0, 0.0, 0.0, 0.0 });
wlr_render_texture_with_matrix(renderer, tex, mat, 1.0f);
wlr_renderer_end(renderer);
assert(surf->back_buffer != NULL);
struct wlr_buffer *out = wlr_buffer_lock(surf->back_buffer);
drm_surface_unset_current(surf);
wlr_texture_destroy(tex);
return out;
}
void drm_plane_finish_surface(struct wlr_drm_plane *plane) {
if (!plane) {
return;
}
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drm_fb_clear(&plane->pending_fb);
drm_fb_clear(&plane->queued_fb);
drm_fb_clear(&plane->current_fb);
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finish_drm_surface(&plane->surf);
finish_drm_surface(&plane->mgpu_surf);
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}
static uint32_t strip_alpha_channel(uint32_t format) {
switch (format) {
case DRM_FORMAT_ARGB8888:
return DRM_FORMAT_XRGB8888;
default:
return DRM_FORMAT_INVALID;
}
}
static struct wlr_drm_format *create_linear_format(uint32_t format) {
struct wlr_drm_format *fmt = wlr_drm_format_create(format);
if (fmt == NULL) {
return NULL;
}
if (!wlr_drm_format_add(&fmt, DRM_FORMAT_MOD_LINEAR)) {
free(fmt);
return NULL;
}
return fmt;
}
bool drm_plane_init_surface(struct wlr_drm_plane *plane,
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struct wlr_drm_backend *drm, int32_t width, uint32_t height,
uint32_t format, bool with_modifiers) {
if (!wlr_drm_format_set_has(&plane->formats, format, DRM_FORMAT_MOD_INVALID)) {
format = strip_alpha_channel(format);
}
const struct wlr_drm_format *plane_format =
wlr_drm_format_set_get(&plane->formats, format);
if (plane_format == NULL) {
wlr_log(WLR_ERROR, "Plane %"PRIu32" doesn't support format 0x%"PRIX32,
plane->id, format);
return false;
}
const struct wlr_drm_format_set *render_formats =
wlr_renderer_get_dmabuf_render_formats(drm->renderer.wlr_rend);
if (render_formats == NULL) {
wlr_log(WLR_ERROR, "Failed to get render formats");
return false;
}
const struct wlr_drm_format *render_format =
wlr_drm_format_set_get(render_formats, format);
if (render_format == NULL) {
wlr_log(WLR_ERROR, "Renderer doesn't support format 0x%"PRIX32,
format);
return false;
}
struct wlr_drm_format *format_implicit_modifier = NULL;
if (!with_modifiers) {
format_implicit_modifier = wlr_drm_format_create(format);
render_format = format_implicit_modifier;
}
struct wlr_drm_format *drm_format =
wlr_drm_format_intersect(plane_format, render_format);
if (drm_format == NULL) {
wlr_log(WLR_ERROR,
"Failed to intersect plane and render formats 0x%"PRIX32,
format);
free(format_implicit_modifier);
return false;
}
drm_plane_finish_surface(plane);
bool ok = true;
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if (!drm->parent) {
ok = init_drm_surface(&plane->surf, &drm->renderer,
width, height, drm_format);
} else {
struct wlr_drm_format *drm_format_linear = create_linear_format(format);
if (drm_format_linear == NULL) {
free(drm_format);
free(format_implicit_modifier);
return false;
}
ok = init_drm_surface(&plane->surf, &drm->parent->renderer,
width, height, drm_format_linear);
free(drm_format_linear);
if (ok && !init_drm_surface(&plane->mgpu_surf, &drm->renderer,
width, height, drm_format)) {
finish_drm_surface(&plane->surf);
ok = false;
}
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}
free(drm_format);
free(format_implicit_modifier);
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return ok;
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}
void drm_fb_clear(struct wlr_drm_fb **fb_ptr) {
if (*fb_ptr == NULL) {
return;
}
struct wlr_drm_fb *fb = *fb_ptr;
wlr_buffer_unlock(fb->wlr_buf); // may destroy the buffer
*fb_ptr = NULL;
}
bool drm_fb_lock_surface(struct wlr_drm_fb **fb_ptr, struct wlr_drm_backend *drm,
struct wlr_drm_surface *surf, struct wlr_drm_surface *mgpu) {
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assert(surf->back_buffer != NULL);
struct wlr_buffer *buffer = wlr_buffer_lock(surf->back_buffer);
// Unset the current EGL context ASAP, because other operations may require
// making another context current.
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drm_surface_unset_current(surf);
bool ok = drm_fb_import(fb_ptr, drm, buffer, mgpu, NULL);
wlr_buffer_unlock(buffer);
return ok;
}
static struct gbm_bo *get_bo_for_dmabuf(struct gbm_device *gbm,
struct wlr_dmabuf_attributes *attribs) {
if (attribs->modifier != DRM_FORMAT_MOD_INVALID ||
attribs->n_planes > 1 || attribs->offset[0] != 0) {
struct gbm_import_fd_modifier_data data = {
.width = attribs->width,
.height = attribs->height,
.format = attribs->format,
.num_fds = attribs->n_planes,
.modifier = attribs->modifier,
};
if ((size_t)attribs->n_planes > sizeof(data.fds) / sizeof(data.fds[0])) {
return false;
}
for (size_t i = 0; i < (size_t)attribs->n_planes; ++i) {
data.fds[i] = attribs->fd[i];
data.strides[i] = attribs->stride[i];
data.offsets[i] = attribs->offset[i];
}
return gbm_bo_import(gbm, GBM_BO_IMPORT_FD_MODIFIER,
&data, GBM_BO_USE_SCANOUT);
} else {
struct gbm_import_fd_data data = {
.fd = attribs->fd[0],
.width = attribs->width,
.height = attribs->height,
.stride = attribs->stride[0],
.format = attribs->format,
};
return gbm_bo_import(gbm, GBM_BO_IMPORT_FD, &data, GBM_BO_USE_SCANOUT);
}
}
static void drm_fb_handle_wlr_buf_destroy(struct wl_listener *listener,
void *data) {
struct wlr_drm_fb *fb = wl_container_of(listener, fb, wlr_buf_destroy);
drm_fb_destroy(fb);
}
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static struct wlr_drm_fb *drm_fb_create(struct wlr_drm_backend *drm,
struct wlr_buffer *buf, const struct wlr_drm_format_set *formats) {
struct wlr_drm_fb *fb = calloc(1, sizeof(*fb));
if (!fb) {
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return NULL;
}
struct wlr_dmabuf_attributes attribs;
if (!wlr_buffer_get_dmabuf(buf, &attribs)) {
wlr_log(WLR_ERROR, "Failed to get DMA-BUF from buffer");
goto error_get_dmabuf;
}
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if (formats && !wlr_drm_format_set_has(formats, attribs.format,
attribs.modifier)) {
// The format isn't supported by the plane. Try stripping the alpha
// channel, if any.
uint32_t format = strip_alpha_channel(attribs.format);
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if (wlr_drm_format_set_has(formats, format, attribs.modifier)) {
attribs.format = format;
} else {
wlr_log(WLR_ERROR, "Buffer format 0x%"PRIX32" cannot be scanned out",
attribs.format);
goto error_get_dmabuf;
}
}
fb->bo = get_bo_for_dmabuf(drm->renderer.gbm, &attribs);
if (!fb->bo) {
wlr_log(WLR_ERROR, "Failed to import DMA-BUF in GBM");
goto error_get_dmabuf;
}
fb->id = get_fb_for_bo(fb->bo, drm->addfb2_modifiers);
if (!fb->id) {
wlr_log(WLR_ERROR, "Failed to import GBM BO in KMS");
goto error_get_fb_for_bo;
}
fb->wlr_buf = buf;
fb->wlr_buf_destroy.notify = drm_fb_handle_wlr_buf_destroy;
wl_signal_add(&buf->events.destroy, &fb->wlr_buf_destroy);
wl_list_insert(&drm->fbs, &fb->link);
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return fb;
error_get_fb_for_bo:
gbm_bo_destroy(fb->bo);
error_get_dmabuf:
free(fb);
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return NULL;
}
void drm_fb_destroy(struct wlr_drm_fb *fb) {
wl_list_remove(&fb->link);
wl_list_remove(&fb->wlr_buf_destroy.link);
struct gbm_device *gbm = gbm_bo_get_device(fb->bo);
if (drmModeRmFB(gbm_device_get_fd(gbm), fb->id) != 0) {
wlr_log(WLR_ERROR, "drmModeRmFB failed");
}
gbm_bo_destroy(fb->bo);
free(fb);
}
static struct wlr_drm_fb *drm_fb_get(struct wlr_drm_backend *drm,
struct wlr_buffer *local_buf) {
struct wlr_drm_fb *fb;
wl_list_for_each(fb, &drm->fbs, link) {
if (fb->wlr_buf == local_buf) {
return fb;
}
}
return NULL;
}
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bool drm_fb_import(struct wlr_drm_fb **fb_ptr, struct wlr_drm_backend *drm,
struct wlr_buffer *buf, struct wlr_drm_surface *mgpu,
const struct wlr_drm_format_set *formats) {
struct wlr_buffer *local_buf;
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if (drm->parent && mgpu) {
// Perform a copy across GPUs
local_buf = drm_surface_blit(mgpu, buf);
if (!local_buf) {
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wlr_log(WLR_ERROR, "Failed to blit buffer across GPUs");
return false;
}
} else {
local_buf = wlr_buffer_lock(buf);
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}
struct wlr_drm_fb *fb = drm_fb_get(drm, local_buf);
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if (!fb) {
fb = drm_fb_create(drm, local_buf, formats);
if (!fb) {
wlr_buffer_unlock(local_buf);
return false;
}
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}
drm_fb_move(fb_ptr, &fb);
return true;
}
void drm_fb_move(struct wlr_drm_fb **new, struct wlr_drm_fb **old) {
drm_fb_clear(new);
*new = *old;
*old = NULL;
}
bool drm_surface_render_black_frame(struct wlr_drm_surface *surf) {
if (!drm_surface_make_current(surf, NULL)) {
return false;
}
struct wlr_renderer *renderer = surf->renderer->wlr_rend;
wlr_renderer_begin(renderer, surf->width, surf->height);
wlr_renderer_clear(renderer, (float[]){ 0.0, 0.0, 0.0, 1.0 });
wlr_renderer_end(renderer);
return true;
}