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Fixed potential output error if buffer top were hit; clarified buffer size constants.

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This commit is contained in:
Thomas Harte 2016-05-10 19:04:03 -04:00
parent 309313c470
commit 257420b0f7
3 changed files with 24 additions and 23 deletions
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34
Outputs/CRT/CRT.cpp
View File

@ -69,8 +69,7 @@ CRT::CRT(unsigned int common_output_divisor) :
_common_output_divisor(common_output_divisor),
_is_writing_composite_run(false),
_delegate(nullptr),
_frames_since_last_delegate_call(0),
_did_start_run(false) {}
_frames_since_last_delegate_call(0) {}
CRT::CRT(unsigned int cycles_per_line, unsigned int common_output_divisor, unsigned int height_of_display, ColourSpace colour_space, unsigned int colour_cycle_numerator, unsigned int colour_cycle_denominator, unsigned int buffer_depth) : CRT(common_output_divisor)
{
@ -187,29 +186,26 @@ void CRT::advance_cycles(unsigned int number_of_cycles, unsigned int source_divi
if(needs_endpoint)
{
if(
_is_writing_composite_run == _did_start_run &&
_openGL_output_builder->composite_output_run_has_room_for_vertex() &&
!_openGL_output_builder->composite_output_buffer_is_full())
{
uint8_t *next_run = _openGL_output_builder->get_next_output_run();
if(next_run)
if(!_is_writing_composite_run)
{
if(_did_start_run)
{
output_x1() = (uint16_t)_horizontal_flywheel->get_current_output_position();
output_position_y() = (uint16_t)(_vertical_flywheel->get_current_output_position() / _vertical_flywheel_output_divider);
output_tex_y() = _openGL_output_builder->get_composite_output_y();
}
else
{
output_x2() = (uint16_t)_horizontal_flywheel->get_current_output_position();
_openGL_output_builder->complete_output_run();
}
_did_start_run ^= true;
_output_run.x1 = (uint16_t)_horizontal_flywheel->get_current_output_position();
_output_run.y = (uint16_t)(_vertical_flywheel->get_current_output_position() / _vertical_flywheel_output_divider);
_output_run.tex_y = _openGL_output_builder->get_composite_output_y();
}
else
{
uint8_t *next_run = _openGL_output_builder->get_next_output_run();
output_x1() = _output_run.x1;
output_position_y() = _output_run.y;
output_tex_y() = _output_run.tex_y;
output_x2() = (uint16_t)_horizontal_flywheel->get_current_output_position();
_openGL_output_builder->complete_output_run();
}
_is_writing_composite_run ^= true;
}
_is_writing_composite_run ^= true;
}
if(next_run_length == time_until_horizontal_sync_event && next_horizontal_sync_event == Flywheel::SyncEvent::StartRetrace)

9
Outputs/CRT/CRT.hpp
View File

@ -68,7 +68,7 @@ class CRT {
uint8_t _colour_burst_phase, _colour_burst_amplitude;
uint16_t _colour_burst_time;
bool _is_writing_composite_run, _did_start_run;
bool _is_writing_composite_run;
// the outer entry point for dispatching output_sync, output_blank, output_level and output_data
void advance_cycles(unsigned int number_of_cycles, unsigned int source_divider, bool hsync_requested, bool vsync_requested, const bool vsync_charging, const Scan::Type type, uint16_t tex_x, uint16_t tex_y);
@ -81,7 +81,12 @@ class CRT {
// OpenGL state, kept behind an opaque pointer to avoid inclusion of the GL headers here.
std::unique_ptr<OpenGLOutputBuilder> _openGL_output_builder;
// The delegate;
// temporary storage used during the construction of output runs
struct {
uint16_t x1, y, tex_y;
} _output_run;
// The delegate
Delegate *_delegate;
unsigned int _frames_since_last_delegate_call;

4
Outputs/CRT/Internals/CRTConstants.hpp
View File

@ -40,8 +40,8 @@ const GLsizei IntermediateBufferWidth = 2048;
const GLsizei IntermediateBufferHeight = 1024;
// Some internal buffer sizes
const GLsizeiptr OutputVertexBufferDataSize = 8 * IntermediateBufferHeight; // likely always to be OutputVertexSize * IntermediateBufferHeight, that being the maximum number of scans of output that can be created between draws
const GLsizeiptr SourceVertexBufferDataSize = 2 * 16 * IntermediateBufferHeight * 2; // a multiple of 2 * SourceVertexSize
const GLsizeiptr OutputVertexBufferDataSize = OutputVertexSize * IntermediateBufferHeight; // i.e. the maximum number of scans of output that can be created between draws
const GLsizeiptr SourceVertexBufferDataSize = 2 * SourceVertexSize * IntermediateBufferHeight * 2; // a multiple of 2 * SourceVertexSize
}
}