wlroots-hyprland/types/output/swapchain.c

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#include <assert.h>
#include <drm_fourcc.h>
#include <stdlib.h>
#include <wlr/render/allocator.h>
#include <wlr/render/swapchain.h>
#include <wlr/util/log.h>
#include <xf86drm.h>
#include "render/drm_format_set.h"
#include "types/wlr_output.h"
static struct wlr_swapchain *create_swapchain(struct wlr_output *output,
int width, int height, bool allow_modifiers) {
struct wlr_allocator *allocator = output->allocator;
assert(output->allocator != NULL);
const struct wlr_drm_format_set *display_formats =
wlr_output_get_primary_formats(output, allocator->buffer_caps);
struct wlr_drm_format *format = output_pick_format(output, display_formats,
output->render_format);
if (format == NULL) {
wlr_log(WLR_ERROR, "Failed to pick primary buffer format for output '%s'",
output->name);
return NULL;
}
char *format_name = drmGetFormatName(format->format);
wlr_log(WLR_DEBUG, "Choosing primary buffer format %s (0x%08"PRIX32") for output '%s'",
format_name ? format_name : "<unknown>", format->format, output->name);
free(format_name);
if (!allow_modifiers && (format->len != 1 || format->modifiers[0] != DRM_FORMAT_MOD_LINEAR)) {
if (!wlr_drm_format_has(format, DRM_FORMAT_MOD_INVALID)) {
wlr_log(WLR_DEBUG, "Implicit modifiers not supported");
wlr_drm_format_finish(format);
free(format);
return NULL;
}
format->len = 0;
wlr_drm_format_add(format, DRM_FORMAT_MOD_INVALID);
}
struct wlr_swapchain *swapchain = wlr_swapchain_create(allocator, width, height, format);
wlr_drm_format_finish(format);
free(format);
return swapchain;
}
static bool test_swapchain(struct wlr_output *output,
struct wlr_swapchain *swapchain, const struct wlr_output_state *state) {
struct wlr_buffer *buffer = wlr_swapchain_acquire(swapchain, NULL);
if (buffer == NULL) {
return false;
}
struct wlr_output_state copy = *state;
copy.committed |= WLR_OUTPUT_STATE_BUFFER;
copy.buffer = buffer;
bool ok = wlr_output_test_state(output, &copy);
wlr_buffer_unlock(buffer);
return ok;
}
bool wlr_output_configure_primary_swapchain(struct wlr_output *output,
const struct wlr_output_state *state, struct wlr_swapchain **swapchain_ptr) {
const struct wlr_output_state empty_state = {0};
if (state == NULL) {
state = &empty_state;
}
int width, height;
output_pending_resolution(output, state, &width, &height);
// Re-use the existing swapchain if possible
struct wlr_swapchain *old_swapchain = *swapchain_ptr;
if (old_swapchain != NULL &&
old_swapchain->width == width && old_swapchain->height == height &&
old_swapchain->format->format == output->render_format) {
return true;
}
struct wlr_swapchain *swapchain = create_swapchain(output, width, height, true);
if (swapchain == NULL) {
wlr_log(WLR_ERROR, "Failed to create swapchain for output '%s'", output->name);
return false;
}
wlr_log(WLR_DEBUG, "Testing swapchain for output '%s'", output->name);
if (!test_swapchain(output, swapchain, state)) {
wlr_log(WLR_DEBUG, "Output test failed on '%s', retrying without modifiers",
output->name);
wlr_swapchain_destroy(swapchain);
swapchain = create_swapchain(output, width, height, false);
if (swapchain == NULL) {
wlr_log(WLR_ERROR, "Failed to create modifier-less swapchain for output '%s'",
output->name);
return NULL;
}
wlr_log(WLR_DEBUG, "Testing modifier-less swapchain for output '%s'", output->name);
if (!test_swapchain(output, swapchain, state)) {
wlr_log(WLR_ERROR, "Swapchain for output '%s' failed test", output->name);
wlr_swapchain_destroy(swapchain);
return NULL;
}
}
wlr_swapchain_destroy(*swapchain_ptr);
*swapchain_ptr = swapchain;
return true;
}