diff options
Diffstat (limited to 'render')
| -rw-r--r-- | render/gbm_allocator.c | 182 | ||||
| -rw-r--r-- | render/meson.build | 1 |
2 files changed, 183 insertions, 0 deletions
diff --git a/render/gbm_allocator.c b/render/gbm_allocator.c new file mode 100644 index 00000000..da29501a --- /dev/null +++ b/render/gbm_allocator.c @@ -0,0 +1,182 @@ +#define _POSIX_C_SOURCE 200809L +#include <assert.h> +#include <drm_fourcc.h> +#include <fcntl.h> +#include <stdlib.h> +#include <unistd.h> +#include <wlr/util/log.h> +#include <xf86drm.h> +#include "render/gbm_allocator.h" + +static const struct wlr_buffer_impl buffer_impl; + +static struct wlr_gbm_buffer *get_gbm_buffer_from_buffer( + struct wlr_buffer *buffer) { + assert(buffer->impl == &buffer_impl); + return (struct wlr_gbm_buffer *)buffer; +} + +static struct wlr_gbm_buffer *create_buffer(struct gbm_device *gbm_device, + int width, int height, const struct wlr_drm_format *format) { + struct gbm_bo *bo = NULL; + if (format->len > 0) { + bo = gbm_bo_create_with_modifiers(gbm_device, width, height, + format->format, format->modifiers, format->len); + } + if (bo == NULL) { + uint32_t usage = GBM_BO_USE_SCANOUT | GBM_BO_USE_RENDERING; + if (format->len == 1 && + format->modifiers[0] == DRM_FORMAT_MOD_LINEAR) { + usage |= GBM_BO_USE_LINEAR; + } + bo = gbm_bo_create(gbm_device, width, height, format->format, usage); + } + if (bo == NULL) { + wlr_log(WLR_ERROR, "gbm_bo_create failed"); + return NULL; + } + + struct wlr_gbm_buffer *buffer = calloc(1, sizeof(*buffer)); + if (buffer == NULL) { + gbm_bo_destroy(bo); + return NULL; + } + wlr_buffer_init(&buffer->base, &buffer_impl, width, height); + buffer->gbm_bo = bo; + + wlr_log(WLR_DEBUG, "Allocated %dx%d GBM buffer (format 0x%"PRIX32", " + "modifier 0x%"PRIX64")", buffer->base.width, buffer->base.height, + gbm_bo_get_format(bo), gbm_bo_get_modifier(bo)); + + return buffer; +} + +static void buffer_destroy(struct wlr_buffer *wlr_buffer) { + struct wlr_gbm_buffer *buffer = + get_gbm_buffer_from_buffer(wlr_buffer); + wlr_dmabuf_attributes_finish(&buffer->dmabuf); + gbm_bo_destroy(buffer->gbm_bo); + free(buffer); +} + +static bool buffer_create_dmabuf(struct wlr_gbm_buffer *buffer) { + assert(buffer->dmabuf.n_planes == 0); + + struct gbm_bo *bo = buffer->gbm_bo; + struct wlr_dmabuf_attributes attribs = {0}; + + attribs.n_planes = gbm_bo_get_plane_count(bo); + if (attribs.n_planes > WLR_DMABUF_MAX_PLANES) { + wlr_log(WLR_ERROR, "GBM BO contains too many planes (%d)", + attribs.n_planes); + return false; + } + + attribs.width = gbm_bo_get_width(bo); + attribs.height = gbm_bo_get_height(bo); + attribs.format = gbm_bo_get_format(bo); + attribs.modifier = gbm_bo_get_modifier(bo); + + int i; + for (i = 0; i < attribs.n_planes; ++i) { + union gbm_bo_handle handle = gbm_bo_get_handle_for_plane(bo, i); + if (handle.s32 < 0) { + wlr_log(WLR_ERROR, "gbm_bo_get_handle_for_plane failed"); + goto error_fd; + } + + int drm_fd = gbm_device_get_fd(gbm_bo_get_device(bo)); + int ret = drmPrimeHandleToFD(drm_fd, handle.s32, + DRM_CLOEXEC, &attribs.fd[i]); + if (ret < 0 || attribs.fd[i] < 0) { + wlr_log_errno(WLR_ERROR, "drmPrimeHandleToFD failed"); + goto error_fd; + } + + attribs.offset[i] = gbm_bo_get_offset(bo, i); + attribs.stride[i] = gbm_bo_get_stride_for_plane(bo, i); + } + + memcpy(&buffer->dmabuf, &attribs, sizeof(attribs)); + return true; + +error_fd: + for (int j = 0; j < i; ++j) { + close(attribs.fd[j]); + } + return false; +} + +static bool buffer_get_dmabuf(struct wlr_buffer *wlr_buffer, + struct wlr_dmabuf_attributes *attribs) { + struct wlr_gbm_buffer *buffer = + get_gbm_buffer_from_buffer(wlr_buffer); + + memset(attribs, 0, sizeof(*attribs)); + + // Only export the buffer once + if (buffer->dmabuf.n_planes == 0) { + if (!buffer_create_dmabuf(buffer)) { + return false; + } + } + + memcpy(attribs, &buffer->dmabuf, sizeof(buffer->dmabuf)); + return true; +} + +static const struct wlr_buffer_impl buffer_impl = { + .destroy = buffer_destroy, + .get_dmabuf = buffer_get_dmabuf, +}; + +static const struct wlr_allocator_interface allocator_impl; + +static struct wlr_gbm_allocator *get_gbm_alloc_from_alloc( + struct wlr_allocator *alloc) { + assert(alloc->impl == &allocator_impl); + return (struct wlr_gbm_allocator *)alloc; +} + +struct wlr_gbm_allocator *wlr_gbm_allocator_create(int fd) { + struct wlr_gbm_allocator *alloc = calloc(1, sizeof(*alloc)); + if (alloc == NULL) { + return NULL; + } + wlr_allocator_init(&alloc->base, &allocator_impl); + + alloc->fd = fd; + + alloc->gbm_device = gbm_create_device(fd); + if (alloc->gbm_device == NULL) { + wlr_log(WLR_ERROR, "gbm_create_device failed"); + free(alloc); + return NULL; + } + + return alloc; +} + +static void allocator_destroy(struct wlr_allocator *wlr_alloc) { + struct wlr_gbm_allocator *alloc = get_gbm_alloc_from_alloc(wlr_alloc); + gbm_device_destroy(alloc->gbm_device); + close(alloc->fd); + free(alloc); +} + +static struct wlr_buffer *allocator_create_buffer( + struct wlr_allocator *wlr_alloc, int width, int height, + const struct wlr_drm_format *format) { + struct wlr_gbm_allocator *alloc = get_gbm_alloc_from_alloc(wlr_alloc); + struct wlr_gbm_buffer *buffer = + create_buffer(alloc->gbm_device, width, height, format); + if (buffer == NULL) { + return NULL; + } + return &buffer->base; +} + +static const struct wlr_allocator_interface allocator_impl = { + .destroy = allocator_destroy, + .create_buffer = allocator_create_buffer, +}; diff --git a/render/meson.build b/render/meson.build index 58cc6761..f68322fe 100644 --- a/render/meson.build +++ b/render/meson.build @@ -3,6 +3,7 @@ wlr_files += files( 'dmabuf.c', 'egl.c', 'drm_format_set.c', + 'gbm_allocator.c', 'gles2/pixel_format.c', 'gles2/renderer.c', 'gles2/shaders.c', |