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Begins attempts to keep track of display metrics.

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i.e. a system that can both make smart decisions about when to use a lower resolution, and hopefully allow some sort of flywheel-esque horizontal retrace synchronisation. And possibly some raster beam chasing?
This commit is contained in:
Thomas Harte
2019-03-04 21:54:50 -05:00
parent 8915950c7d
commit 86a6b04d4a
5 changed files with 94 additions and 2 deletions
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Outputs/OpenGL/ScanTarget.cpp
+22
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@@ -254,6 +254,9 @@ void ScanTarget::submit() {
}
void ScanTarget::announce(Event event, bool is_visible, const Outputs::Display::ScanTarget::Scan::EndPoint &location, uint8_t composite_amplitude) {
// Forward the event to the display metrics tracker.
display_metrics_.announce_event(event);
if(event == ScanTarget::Event::EndVerticalRetrace) {
// The previous-frame-is-complete flag is subject to a two-slot queue because
// measurement for *this* frame needs to begin now, meaning that the previous
@@ -383,14 +386,26 @@ void ScanTarget::setup_pipeline() {
input_shader_->set_uniform("textureName", GLint(SourceDataTextureUnit - GL_TEXTURE0));
}
Outputs::Display::Metrics &ScanTarget::display_metrics() {
return display_metrics_;
}
void ScanTarget::update(int output_width, int output_height) {
if(fence_ != nullptr) {
// if the GPU is still busy, don't wait; we'll catch it next time
if(glClientWaitSync(fence_, GL_SYNC_FLUSH_COMMANDS_BIT, 0) == GL_TIMEOUT_EXPIRED) {
display_metrics_.announce_draw_status(
lines_submitted_,
std::chrono::high_resolution_clock::now() - line_submission_begin_time_,
false);
return;
}
fence_ = nullptr;
}
display_metrics_.announce_draw_status(
lines_submitted_,
std::chrono::high_resolution_clock::now() - line_submission_begin_time_,
true);
// Spin until the is-drawing flag is reset; the wait sync above will deal
// with instances where waiting is inappropriate.
@@ -403,10 +418,16 @@ void ScanTarget::update(int output_width, int output_height) {
modals_are_dirty_ = false;
}
// Determine the start time of this submission group.
line_submission_begin_time_ = std::chrono::high_resolution_clock::now();
// Grab the current read and submit pointers.
const auto submit_pointers = submit_pointers_.load();
const auto read_pointers = read_pointers_.load();
// Determine how many lines are about to be submitted.
lines_submitted_ = (read_pointers.line + line_buffer_.size() - submit_pointers.line) % line_buffer_.size();
// Submit scans; only the new ones need to be communicated.
size_t new_scans = (submit_pointers.scan_buffer + scan_buffer_.size() - read_pointers.scan_buffer) % scan_buffer_.size();
if(new_scans) {
@@ -536,6 +557,7 @@ void ScanTarget::update(int output_width, int output_height) {
const int proportional_width = (framebuffer_height * 4) / 3;
const bool did_create_accumulation_texture = !accumulation_texture_ || ( /* !synchronous && */ (accumulation_texture_->get_width() != proportional_width || accumulation_texture_->get_height() != framebuffer_height));
if(did_create_accumulation_texture) {
display_metrics_.announce_did_resize();
std::unique_ptr<OpenGL::TextureTarget> new_framebuffer(
new TextureTarget(
GLsizei(proportional_width),