117 lines
3.3 KiB
C
117 lines
3.3 KiB
C
#include <assert.h>
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#include <drm_fourcc.h>
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#include <stdlib.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#include <wlr/util/log.h>
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#include "render/pixel_format.h"
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#include "render/shm_allocator.h"
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#include "util/shm.h"
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static const struct wlr_buffer_impl buffer_impl;
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static struct wlr_shm_buffer *shm_buffer_from_buffer(
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struct wlr_buffer *wlr_buffer) {
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assert(wlr_buffer->impl == &buffer_impl);
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return (struct wlr_shm_buffer *)wlr_buffer;
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}
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static void buffer_destroy(struct wlr_buffer *wlr_buffer) {
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struct wlr_shm_buffer *buffer = shm_buffer_from_buffer(wlr_buffer);
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munmap(buffer->data, buffer->size);
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close(buffer->shm.fd);
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free(buffer);
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}
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static bool buffer_get_shm(struct wlr_buffer *wlr_buffer,
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struct wlr_shm_attributes *shm) {
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struct wlr_shm_buffer *buffer = shm_buffer_from_buffer(wlr_buffer);
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memcpy(shm, &buffer->shm, sizeof(*shm));
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return true;
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}
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static bool shm_buffer_begin_data_ptr_access(struct wlr_buffer *wlr_buffer,
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void **data, uint32_t *format, size_t *stride) {
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struct wlr_shm_buffer *buffer = shm_buffer_from_buffer(wlr_buffer);
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*data = buffer->data;
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*format = buffer->shm.format;
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*stride = buffer->shm.stride;
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return true;
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}
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static void shm_buffer_end_data_ptr_access(struct wlr_buffer *wlr_buffer) {
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// This space is intentionally left blank
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}
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static const struct wlr_buffer_impl buffer_impl = {
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.destroy = buffer_destroy,
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.get_shm = buffer_get_shm,
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.begin_data_ptr_access = shm_buffer_begin_data_ptr_access,
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.end_data_ptr_access = shm_buffer_end_data_ptr_access,
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};
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static struct wlr_buffer *allocator_create_buffer(
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struct wlr_allocator *wlr_allocator, int width, int height,
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const struct wlr_drm_format *format) {
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const struct wlr_pixel_format_info *info =
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drm_get_pixel_format_info(format->format);
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if (info == NULL) {
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wlr_log(WLR_ERROR, "Unsupported pixel format 0x%"PRIX32, format->format);
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return NULL;
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}
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struct wlr_shm_buffer *buffer = calloc(1, sizeof(*buffer));
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if (buffer == NULL) {
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return NULL;
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}
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wlr_buffer_init(&buffer->base, &buffer_impl, width, height);
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// TODO: consider using a single file for multiple buffers
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int bytes_per_pixel = info->bpp / 8;
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int stride = width * bytes_per_pixel; // TODO: align?
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buffer->size = stride * height;
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buffer->shm.fd = allocate_shm_file(buffer->size);
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if (buffer->shm.fd < 0) {
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free(buffer);
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return NULL;
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}
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buffer->shm.format = format->format;
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buffer->shm.width = width;
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buffer->shm.height = height;
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buffer->shm.stride = stride;
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buffer->shm.offset = 0;
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buffer->data = mmap(NULL, buffer->size, PROT_READ | PROT_WRITE, MAP_SHARED,
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buffer->shm.fd, 0);
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if (buffer->data == MAP_FAILED) {
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wlr_log_errno(WLR_ERROR, "mmap failed");
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close(buffer->shm.fd);
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free(buffer);
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return NULL;
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}
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return &buffer->base;
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}
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static void allocator_destroy(struct wlr_allocator *wlr_allocator) {
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free(wlr_allocator);
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}
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static const struct wlr_allocator_interface allocator_impl = {
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.destroy = allocator_destroy,
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.create_buffer = allocator_create_buffer,
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};
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struct wlr_allocator *wlr_shm_allocator_create(void) {
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struct wlr_shm_allocator *allocator = calloc(1, sizeof(*allocator));
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if (allocator == NULL) {
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return NULL;
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}
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wlr_allocator_init(&allocator->base, &allocator_impl,
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WLR_BUFFER_CAP_DATA_PTR | WLR_BUFFER_CAP_SHM);
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wlr_log(WLR_DEBUG, "Created shm allocator");
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return &allocator->base;
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}
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