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output: stop using wlr_output.back_buffer in output_ensure_buffer()

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This allows us to use the new render pass API, and drops some
implicit state usage.
This commit is contained in:
Simon Ser 2023-06-20 11:32:17 +02:00 committed by Alexander Orzechowski
parent b625a13156
commit c4d4409deb
2 changed files with 52 additions and 46 deletions
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4
types/output/output.c
View file

@ -688,7 +688,6 @@ bool wlr_output_test_state(struct wlr_output *output,
bool success = output->impl->test(output, &copy);
if (new_back_buffer) {
wlr_buffer_unlock(copy.buffer);
output_clear_back_buffer(output);
}
return success;
}
@ -723,9 +722,6 @@ bool wlr_output_commit_state(struct wlr_output *output,
if (!output_ensure_buffer(output, &pending, &new_back_buffer)) {
return false;
}
if (new_back_buffer) {
output_clear_back_buffer(output);
}
if ((pending.committed & WLR_OUTPUT_STATE_BUFFER) &&
output->idle_frame != NULL) {

94
types/output/render.c
View file

@ -43,15 +43,24 @@ bool wlr_output_init_render(struct wlr_output *output,
return true;
}
static bool output_attach_back_buffer(struct wlr_output *output,
const struct wlr_output_state *state, int *buffer_age) {
void output_clear_back_buffer(struct wlr_output *output) {
if (output->back_buffer == NULL) {
return;
}
struct wlr_renderer *renderer = output->renderer;
assert(renderer != NULL);
renderer_bind_buffer(renderer, NULL);
wlr_buffer_unlock(output->back_buffer);
output->back_buffer = NULL;
}
bool wlr_output_attach_render(struct wlr_output *output, int *buffer_age) {
assert(output->back_buffer == NULL);
// wlr_output_configure_primary_swapchain() function will call
// wlr_output_test_state(), which can call us again. This is dangerous: we
// risk infinite recursion. However, a buffer will always be supplied in
// wlr_output_test_state(), which will prevent us from being called.
if (!wlr_output_configure_primary_swapchain(output, state,
if (!wlr_output_configure_primary_swapchain(output, &output->pending,
&output->swapchain)) {
return false;
}
@ -74,50 +83,49 @@ static bool output_attach_back_buffer(struct wlr_output *output,
return true;
}
void output_clear_back_buffer(struct wlr_output *output) {
if (output->back_buffer == NULL) {
return;
}
struct wlr_renderer *renderer = output->renderer;
assert(renderer != NULL);
renderer_bind_buffer(renderer, NULL);
wlr_buffer_unlock(output->back_buffer);
output->back_buffer = NULL;
}
bool wlr_output_attach_render(struct wlr_output *output, int *buffer_age) {
return output_attach_back_buffer(output, &output->pending, buffer_age);
}
static bool output_attach_empty_back_buffer(struct wlr_output *output,
static struct wlr_buffer *output_acquire_empty_buffer(struct wlr_output *output,
const struct wlr_output_state *state) {
assert(!(state->committed & WLR_OUTPUT_STATE_BUFFER));
if (!output_attach_back_buffer(output, state, NULL)) {
// wlr_output_configure_primary_swapchain() function will call
// wlr_output_test_state(), which can call us again. This is dangerous: we
// risk infinite recursion. However, a buffer will always be supplied in
// wlr_output_test_state(), which will prevent us from being called.
if (!wlr_output_configure_primary_swapchain(output, state,
&output->swapchain)) {
return false;
}
int width, height;
output_pending_resolution(output, state, &width, &height);
struct wlr_renderer *renderer = output->renderer;
if (!wlr_renderer_begin(renderer, width, height)) {
struct wlr_buffer *buffer = wlr_swapchain_acquire(output->swapchain, NULL);
if (buffer == NULL) {
return false;
}
wlr_renderer_clear(renderer, (float[]){0, 0, 0, 0});
wlr_renderer_end(renderer);
return true;
struct wlr_render_pass *pass =
wlr_renderer_begin_buffer_pass(output->renderer, buffer, NULL);
if (pass == NULL) {
wlr_buffer_unlock(buffer);
return NULL;
}
wlr_render_pass_add_rect(pass, &(struct wlr_render_rect_options){
.color = { 0, 0, 0, 0 },
.blend_mode = WLR_RENDER_BLEND_MODE_NONE,
});
if (!wlr_render_pass_submit(pass)) {
wlr_buffer_unlock(buffer);
return NULL;
}
return buffer;
}
// This function may attach a new, empty back buffer if necessary.
// This function may attach a new, empty buffer if necessary.
// If so, the new_back_buffer out parameter will be set to true.
bool output_ensure_buffer(struct wlr_output *output,
struct wlr_output_state *state, bool *new_back_buffer) {
assert(*new_back_buffer == false);
struct wlr_output_state *state, bool *new_buffer) {
assert(*new_buffer == false);
// If we already have a buffer, we don't need to allocate a new one
if (state->committed & WLR_OUTPUT_STATE_BUFFER) {
@ -158,12 +166,14 @@ bool output_ensure_buffer(struct wlr_output *output,
}
wlr_log(WLR_DEBUG, "Attaching empty buffer to output for modeset");
if (!output_attach_empty_back_buffer(output, state)) {
struct wlr_buffer *buffer = output_acquire_empty_buffer(output, state);
if (buffer == NULL) {
return false;
}
*new_back_buffer = true;
wlr_output_state_set_buffer(state, output->back_buffer);
*new_buffer = true;
wlr_output_state_set_buffer(state, buffer);
wlr_buffer_unlock(buffer);
return true;
}
@ -237,7 +247,7 @@ uint32_t wlr_output_preferred_read_format(struct wlr_output *output) {
return DRM_FORMAT_INVALID;
}
if (!output_attach_back_buffer(output, &output->pending, NULL)) {
if (!wlr_output_attach_render(output, NULL)) {
return false;
}