wlroots-hyprland/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 <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/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"
#include "render/allocator/allocator.h"
#include "render/pixel_format.h"
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#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;
renderer->wlr_rend = renderer_autocreate_with_drm_fd(drm->fd);
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if (!renderer->wlr_rend) {
wlr_log(WLR_ERROR, "Failed to create renderer");
return false;
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}
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renderer->allocator = allocator_autocreate_with_drm_fd(&drm->backend,
renderer->wlr_rend, drm->fd);
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if (renderer->allocator == NULL) {
wlr_log(WLR_ERROR, "Failed to create allocator");
wlr_renderer_destroy(renderer->wlr_rend);
return false;
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}
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return true;
}
void finish_drm_renderer(struct wlr_drm_renderer *renderer) {
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if (!renderer) {
return;
}
wlr_allocator_destroy(renderer->allocator);
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wlr_renderer_destroy(renderer->wlr_rend);
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}
static void finish_drm_surface(struct wlr_drm_surface *surf) {
if (!surf || !surf->renderer) {
return;
}
wlr_swapchain_destroy(surf->swapchain);
memset(surf, 0, sizeof(*surf));
}
bool init_drm_surface(struct wlr_drm_surface *surf,
struct wlr_drm_renderer *renderer, int width, int height,
const struct wlr_drm_format *drm_format) {
if (surf->swapchain != NULL && surf->swapchain->width == width &&
surf->swapchain->height == height) {
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return true;
}
finish_drm_surface(surf);
surf->swapchain = wlr_swapchain_create(renderer->allocator, width, height,
drm_format);
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if (surf->swapchain == NULL) {
wlr_log(WLR_ERROR, "Failed to create swapchain");
return false;
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}
surf->renderer = renderer;
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return true;
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}
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->swapchain->width != buffer->width ||
surf->swapchain->height != buffer->height) {
wlr_log(WLR_ERROR, "Surface size doesn't match buffer size");
return NULL;
}
struct wlr_texture *tex = wlr_texture_from_buffer(renderer, buffer);
if (tex == NULL) {
wlr_log(WLR_ERROR, "Failed to import source buffer into multi-GPU renderer");
return NULL;
}
struct wlr_buffer *dst = wlr_swapchain_acquire(surf->swapchain, NULL);
if (!dst) {
wlr_log(WLR_ERROR, "Failed to acquire multi-GPU swapchain buffer");
wlr_texture_destroy(tex);
return NULL;
}
float mat[9];
wlr_matrix_identity(mat);
wlr_matrix_scale(mat, surf->swapchain->width, surf->swapchain->height);
if (!wlr_renderer_begin_with_buffer(renderer, dst)) {
wlr_log(WLR_ERROR, "Failed to bind multi-GPU destination buffer");
wlr_buffer_unlock(dst);
wlr_texture_destroy(tex);
return NULL;
}
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);
wlr_texture_destroy(tex);
return dst;
}
void drm_plane_finish_surface(struct wlr_drm_plane *plane) {
if (!plane) {
return;
}
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drm_fb_clear(&plane->queued_fb);
drm_fb_clear(&plane->current_fb);
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finish_drm_surface(&plane->mgpu_surf);
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}
struct wlr_drm_format *drm_plane_pick_render_format(
struct wlr_drm_plane *plane, struct wlr_drm_renderer *renderer) {
const struct wlr_drm_format_set *render_formats =
wlr_renderer_get_render_formats(renderer->wlr_rend);
if (render_formats == NULL) {
wlr_log(WLR_ERROR, "Failed to get render formats");
return NULL;
}
const struct wlr_drm_format_set *plane_formats = &plane->formats;
uint32_t fmt = DRM_FORMAT_ARGB8888;
if (!wlr_drm_format_set_get(&plane->formats, fmt)) {
const struct wlr_pixel_format_info *format_info =
drm_get_pixel_format_info(fmt);
assert(format_info != NULL &&
format_info->opaque_substitute != DRM_FORMAT_INVALID);
fmt = format_info->opaque_substitute;
}
const struct wlr_drm_format *render_format =
wlr_drm_format_set_get(render_formats, fmt);
if (render_format == NULL) {
wlr_log(WLR_DEBUG, "Renderer doesn't support format 0x%"PRIX32, fmt);
return NULL;
}
const struct wlr_drm_format *plane_format =
wlr_drm_format_set_get(plane_formats, fmt);
if (plane_format == NULL) {
wlr_log(WLR_DEBUG, "Plane %"PRIu32" doesn't support format 0x%"PRIX32,
plane->id, fmt);
return NULL;
}
struct wlr_drm_format *format =
wlr_drm_format_intersect(plane_format, render_format);
if (format == NULL) {
wlr_log(WLR_DEBUG, "Failed to intersect plane and render "
"modifiers for format 0x%"PRIX32, fmt);
return NULL;
}
return format;
}
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;
}
struct wlr_drm_fb *drm_fb_lock(struct wlr_drm_fb *fb) {
wlr_buffer_lock(fb->wlr_buf);
return fb;
}
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static void drm_fb_handle_destroy(struct wlr_addon *addon) {
struct wlr_drm_fb *fb = wl_container_of(addon, fb, addon);
drm_fb_destroy(fb);
}
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static const struct wlr_addon_interface fb_addon_impl = {
.name = "wlr_drm_fb",
.destroy = drm_fb_handle_destroy,
};
static uint32_t get_fb_for_bo(struct wlr_drm_backend *drm,
struct wlr_dmabuf_attributes *dmabuf, uint32_t handles[static 4]) {
uint64_t modifiers[4] = {0};
for (int i = 0; i < dmabuf->n_planes; i++) {
// KMS requires all BO planes to have the same modifier
modifiers[i] = dmabuf->modifier;
}
uint32_t id = 0;
if (drm->addfb2_modifiers && dmabuf->modifier != DRM_FORMAT_MOD_INVALID) {
if (drmModeAddFB2WithModifiers(drm->fd, dmabuf->width, dmabuf->height,
dmabuf->format, handles, dmabuf->stride, dmabuf->offset,
modifiers, &id, DRM_MODE_FB_MODIFIERS) != 0) {
wlr_log_errno(WLR_DEBUG, "drmModeAddFB2WithModifiers failed");
}
} else {
if (dmabuf->modifier != DRM_FORMAT_MOD_INVALID &&
dmabuf->modifier != DRM_FORMAT_MOD_LINEAR) {
wlr_log(WLR_ERROR, "Cannot import DRM framebuffer with explicit "
"modifier 0x%"PRIX64, dmabuf->modifier);
return 0;
}
int ret = drmModeAddFB2(drm->fd, dmabuf->width, dmabuf->height,
dmabuf->format, handles, dmabuf->stride, dmabuf->offset, &id, 0);
if (ret != 0 && dmabuf->format == DRM_FORMAT_ARGB8888 &&
dmabuf->n_planes == 1 && dmabuf->offset[0] == 0) {
// Some big-endian machines don't support drmModeAddFB2. Try a
// last-resort fallback for ARGB8888 buffers, like Xorg's
// modesetting driver does.
wlr_log(WLR_DEBUG, "drmModeAddFB2 failed (%s), falling back to "
"legacy drmModeAddFB", strerror(-ret));
uint32_t depth = 32;
uint32_t bpp = 32;
ret = drmModeAddFB(drm->fd, dmabuf->width, dmabuf->height, depth,
bpp, dmabuf->stride[0], handles[0], &id);
if (ret != 0) {
wlr_log_errno(WLR_DEBUG, "drmModeAddFB failed");
}
} else if (ret != 0) {
wlr_log_errno(WLR_DEBUG, "drmModeAddFB2 failed");
}
}
return id;
}
static void close_all_bo_handles(struct wlr_drm_backend *drm,
uint32_t handles[static 4]) {
for (int i = 0; i < 4; ++i) {
if (handles[i] == 0) {
continue;
}
// If multiple planes share the same BO handle, avoid double-closing it
bool already_closed = false;
for (int j = 0; j < i; ++j) {
if (handles[i] == handles[j]) {
already_closed = true;
break;
}
}
if (already_closed) {
continue;
}
if (drmCloseBufferHandle(drm->fd, handles[i]) != 0) {
wlr_log_errno(WLR_ERROR, "drmCloseBufferHandle failed");
}
}
}
static void drm_poisoned_fb_handle_destroy(struct wlr_addon *addon) {
wlr_addon_finish(addon);
free(addon);
}
static const struct wlr_addon_interface poisoned_fb_addon_impl = {
.name = "wlr_drm_poisoned_fb",
.destroy = drm_poisoned_fb_handle_destroy,
};
static bool is_buffer_poisoned(struct wlr_drm_backend *drm,
struct wlr_buffer *buf) {
return wlr_addon_find(&buf->addons, drm, &poisoned_fb_addon_impl) != NULL;
}
/**
* Mark the buffer as "poisoned", ie. it cannot be imported into KMS. This
* allows us to avoid repeatedly trying to import it when it's not
* scanout-capable.
*/
static void poison_buffer(struct wlr_drm_backend *drm,
struct wlr_buffer *buf) {
struct wlr_addon *addon = calloc(1, sizeof(*addon));
if (addon == NULL) {
wlr_log_errno(WLR_ERROR, "Allocation failed");
return;
}
wlr_addon_init(addon, &buf->addons, drm, &poisoned_fb_addon_impl);
wlr_log(WLR_DEBUG, "Poisoning buffer");
}
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_dmabuf_attributes attribs;
if (!wlr_buffer_get_dmabuf(buf, &attribs)) {
wlr_log(WLR_DEBUG, "Failed to get DMA-BUF from buffer");
return NULL;
}
if (is_buffer_poisoned(drm, buf)) {
wlr_log(WLR_DEBUG, "Buffer is poisoned");
return NULL;
}
struct wlr_drm_fb *fb = calloc(1, sizeof(*fb));
if (!fb) {
wlr_log_errno(WLR_ERROR, "Allocation failed");
return NULL;
}
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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.
const struct wlr_pixel_format_info *info =
drm_get_pixel_format_info(attribs.format);
if (info != NULL && info->opaque_substitute != DRM_FORMAT_INVALID &&
wlr_drm_format_set_has(formats, info->opaque_substitute, attribs.modifier)) {
attribs.format = info->opaque_substitute;
} else {
wlr_log(WLR_DEBUG, "Buffer format 0x%"PRIX32" with modifier "
"0x%"PRIX64" cannot be scanned out",
attribs.format, attribs.modifier);
goto error_fb;
}
}
uint32_t handles[4] = {0};
for (int i = 0; i < attribs.n_planes; ++i) {
int ret = drmPrimeFDToHandle(drm->fd, attribs.fd[i], &handles[i]);
if (ret != 0) {
wlr_log_errno(WLR_DEBUG, "drmPrimeFDToHandle failed");
goto error_bo_handle;
}
}
fb->id = get_fb_for_bo(drm, &attribs, handles);
if (!fb->id) {
wlr_log(WLR_DEBUG, "Failed to import BO in KMS");
poison_buffer(drm, buf);
goto error_bo_handle;
}
close_all_bo_handles(drm, handles);
fb->backend = drm;
fb->wlr_buf = buf;
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wlr_addon_init(&fb->addon, &buf->addons, drm, &fb_addon_impl);
wl_list_insert(&drm->fbs, &fb->link);
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return fb;
error_bo_handle:
close_all_bo_handles(drm, handles);
error_fb:
free(fb);
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return NULL;
}
void drm_fb_destroy(struct wlr_drm_fb *fb) {
struct wlr_drm_backend *drm = fb->backend;
wl_list_remove(&fb->link);
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wlr_addon_finish(&fb->addon);
if (drmModeRmFB(drm->fd, fb->id) != 0) {
wlr_log(WLR_ERROR, "drmModeRmFB failed");
}
free(fb);
}
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bool drm_fb_import(struct wlr_drm_fb **fb_ptr, struct wlr_drm_backend *drm,
struct wlr_buffer *buf, const struct wlr_drm_format_set *formats) {
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struct wlr_drm_fb *fb;
struct wlr_addon *addon = wlr_addon_find(&buf->addons, drm, &fb_addon_impl);
if (addon != NULL) {
fb = wl_container_of(addon, fb, addon);
} else {
fb = drm_fb_create(drm, buf, formats);
if (!fb) {
return false;
}
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}
wlr_buffer_lock(buf);
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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;
}