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Increased parallelism, allowing a simplification in the GL view.

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This commit is contained in:
Thomas Harte 2016-06-02 22:29:09 -04:00
parent e3b95b8d2b
commit 68a8851c52
4 changed files with 32 additions and 34 deletions
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7
OSBindings/Mac/Clock Signal/Documents/MachineDocument.swift
View File

@ -86,9 +86,10 @@ class MachineDocument: NSDocument, CSOpenGLViewDelegate, CSOpenGLViewResponderDe
skippedFrames = 0
}
if skippedFrames > 4 {
numberOfCycles = min(numberOfCycles, Int64(Double(intendedCyclesPerSecond) * frequency))
}
// run for at most three frames up to and until that causes overshoots in the
// permitted processing window for at least four consecutive frames, in which
// case limit to one
numberOfCycles = min(numberOfCycles, Int64(Double(intendedCyclesPerSecond) * frequency * ((skippedFrames > 4) ? 3.0 : 1.0)))
runForNumberOfCycles(Int32(numberOfCycles))
}
lastTime = time

15
OSBindings/Mac/Clock Signal/Views/CSOpenGLView.m
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@ -56,7 +56,6 @@ static CVReturn DisplayLinkCallback(CVDisplayLinkRef displayLink, const CVTimeSt
- (void)drawAtTime:(const CVTimeStamp *)now frequency:(double)frequency
{
const uint32_t processingMask = 0x01;
const uint32_t drawingMask = 0x02;
// Always post an -openGLView:didUpdateToTime: if a previous one isn't still ongoing. This is the hook upon which the substantial processing occurs.
if(!OSAtomicTestAndSet(processingMask, &_updateIsOngoing))
@ -68,24 +67,14 @@ static CVReturn DisplayLinkCallback(CVDisplayLinkRef displayLink, const CVTimeSt
OSAtomicTestAndClear(processingMask, &_updateIsOngoing);
});
_hasSkipped = NO;
NSLog(@"+");
}
else
{
_hasSkipped = YES;
NSLog(@"-");
}
// Draw the display only if a previous draw is not still ongoing. -drawViewOnlyIfDirty: is guaranteed
// to be safe to call concurrently with -openGLView:updateToTime: so there's no need to worry about
// the above interrupting the below or vice versa.
if(!OSAtomicTestAndSet(drawingMask, &_updateIsOngoing))
{
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{
[self drawViewOnlyIfDirty:YES];
OSAtomicTestAndClear(drawingMask, &_updateIsOngoing);
});
}
// Draw the display now regardless of other activity.
[self drawViewOnlyIfDirty:YES];
}
- (void)invalidate

43
Outputs/CRT/Internals/CRTOpenGL.cpp
View File

@ -108,6 +108,7 @@ namespace {
OpenGLOutputBuilder::OpenGLOutputBuilder(unsigned int buffer_depth) :
_output_mutex(new std::mutex),
_draw_mutex(new std::mutex),
_visible_area(Rect(0, 0, 1, 1)),
_composite_src_output_y(0),
_cleared_composite_output_y(0),
@ -172,8 +173,8 @@ OpenGLOutputBuilder::~OpenGLOutputBuilder()
void OpenGLOutputBuilder::draw_frame(unsigned int output_width, unsigned int output_height, bool only_if_dirty)
{
// lock down any further work on the current frame
_output_mutex->lock();
// lock down any other draw_frames
_draw_mutex->lock();
// establish essentials
if(!output_shader_program)
@ -195,21 +196,6 @@ void OpenGLOutputBuilder::draw_frame(unsigned int output_width, unsigned int out
glDeleteSync(_fence);
}
// release the mapping, giving up on trying to draw if data has been lost
GLsizei submitted_output_data = submitArrayData(output_array_buffer, _output_buffer_data.get(), &_output_buffer_data_pointer);
// bind and flush the source array buffer
GLsizei submitted_source_data = submitArrayData(source_array_buffer, _source_buffer_data.get(), &_source_buffer_data_pointer);
// determine how many lines are newly reclaimed; they'll need to be cleared
Range clearing_zones[2];
// the clearing zones for the composite output Y are calculated with a fixed offset of '1' which has the effect of clearing
// one ahead of the expected drawing area this frame; that's because the current _composite_src_output_y may or may not have been
// written to during the last update, so we want it to have been cleared during the last update.
int number_of_clearing_zones = getCircularRanges(&_cleared_composite_output_y, &_composite_src_output_y, IntermediateBufferHeight, 1, 1, clearing_zones);
uint16_t completed_texture_y = _buffer_builder->get_and_finalise_current_line();
// make sure there's a target to draw to
if(!framebuffer || framebuffer->get_height() != output_height || framebuffer->get_width() != output_width)
{
@ -228,6 +214,24 @@ void OpenGLOutputBuilder::draw_frame(unsigned int output_width, unsigned int out
framebuffer = std::move(new_framebuffer);
}
// lock out the machine emulation until data is copied
_output_mutex->lock();
// release the mapping, giving up on trying to draw if data has been lost
GLsizei submitted_output_data = submitArrayData(output_array_buffer, _output_buffer_data.get(), &_output_buffer_data_pointer);
// bind and flush the source array buffer
GLsizei submitted_source_data = submitArrayData(source_array_buffer, _source_buffer_data.get(), &_source_buffer_data_pointer);
// determine how many lines are newly reclaimed; they'll need to be cleared
Range clearing_zones[2];
// the clearing zones for the composite output Y are calculated with a fixed offset of '1' which has the effect of clearing
// one ahead of the expected drawing area this frame; that's because the current _composite_src_output_y may or may not have been
// written to during the last update, so we want it to have been cleared during the last update.
int number_of_clearing_zones = getCircularRanges(&_cleared_composite_output_y, &_composite_src_output_y, IntermediateBufferHeight, 1, 1, clearing_zones);
uint16_t completed_texture_y = _buffer_builder->get_and_finalise_current_line();
// upload new source pixels
if(completed_texture_y)
{
@ -239,6 +243,9 @@ void OpenGLOutputBuilder::draw_frame(unsigned int output_width, unsigned int out
_buffer_builder->get_image_pointer());
}
// data having been grabbed, allow the machine to continue
_output_mutex->unlock();
struct RenderStage {
OpenGL::TextureTarget *const target;
OpenGL::Shader *const shader;
@ -330,7 +337,7 @@ void OpenGLOutputBuilder::draw_frame(unsigned int output_width, unsigned int out
framebuffer->draw((float)output_width / (float)output_height);
_fence = glFenceSync(GL_SYNC_GPU_COMMANDS_COMPLETE, 0);
_output_mutex->unlock();
_draw_mutex->unlock();
}
void OpenGLOutputBuilder::reset_all_OpenGL_state()

1
Outputs/CRT/Internals/CRTOpenGL.hpp
View File

@ -58,6 +58,7 @@ class OpenGLOutputBuilder {
// the run and input data buffers
std::unique_ptr<CRTInputBufferBuilder> _buffer_builder;
std::unique_ptr<std::mutex> _output_mutex;
std::unique_ptr<std::mutex> _draw_mutex;
// transient buffers indicating composite data not yet decoded
GLsizei _composite_src_output_y, _cleared_composite_output_y;