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Fixed off-by-one error on texture upload.

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This commit is contained in:
Thomas Harte 2016-05-05 07:22:49 -04:00
parent f621cc8523
commit e9a9cfb09f
3 changed files with 13 additions and 16 deletions
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2
Outputs/CRT/Internals/CRTConstants.hpp
View File

@ -33,7 +33,7 @@ const GLsizei SourceVertexSize = 16;
// These constants hold the size of the rolling buffer to which the CPU writes
const GLsizei InputBufferBuilderWidth = 2048;
const GLsizei InputBufferBuilderHeight = 8;
const GLsizei InputBufferBuilderHeight = 8192;
// This is the size of the intermediate buffers used during composite to RGB conversion
const GLsizei IntermediateBufferWidth = 2048;

21
Outputs/CRT/Internals/CRTInputBufferBuilder.cpp
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@ -16,8 +16,6 @@ CRTInputBufferBuilder::CRTInputBufferBuilder(size_t bytes_per_pixel) :
_bytes_per_pixel(bytes_per_pixel),
_next_write_x_position(0),
_next_write_y_position(0),
_last_uploaded_line(0),
_is_full(false),
_image(new uint8_t[bytes_per_pixel * InputBufferBuilderWidth * InputBufferBuilderHeight])
{}
@ -28,7 +26,7 @@ CRTInputBufferBuilder::~CRTInputBufferBuilder()
void CRTInputBufferBuilder::allocate_write_area(size_t required_length)
{
if(!_is_full)
if(_next_write_y_position != InputBufferBuilderHeight)
{
_last_allocation_amount = required_length;
@ -37,8 +35,7 @@ void CRTInputBufferBuilder::allocate_write_area(size_t required_length)
_next_write_x_position = 0;
_next_write_y_position++;
_is_full = (_next_write_y_position == _last_uploaded_line + InputBufferBuilderHeight);
if(_is_full)
if(_next_write_y_position == InputBufferBuilderHeight)
return;
}
@ -46,12 +43,17 @@ void CRTInputBufferBuilder::allocate_write_area(size_t required_length)
_write_y_position = _next_write_y_position;
_write_target_pointer = (_write_y_position * InputBufferBuilderWidth) + _write_x_position;
_next_write_x_position += required_length + 2;
if(_write_y_position == 0 && _write_x_position == 0)
{
memset(_image, 0, _bytes_per_pixel * InputBufferBuilderWidth * InputBufferBuilderHeight);
}
}
}
bool CRTInputBufferBuilder::reduce_previous_allocation_to(size_t actual_length)
{
if(_is_full) return false;
if(_next_write_y_position == InputBufferBuilderHeight) return false;
// book end the allocation with duplicates of the first and last pixel, to protect
// against rounding errors when this run is drawn
@ -76,15 +78,14 @@ uint8_t *CRTInputBufferBuilder::get_image_pointer()
uint16_t CRTInputBufferBuilder::get_and_finalise_current_line()
{
uint16_t result = _write_y_position;
uint16_t result = _write_y_position + (_next_write_x_position ? 1 : 0);
_next_write_x_position = _next_write_y_position = 0;
_is_full = false;
return result;
}
uint8_t *CRTInputBufferBuilder::get_write_target()
{
return _is_full ? nullptr : &_image[_write_target_pointer * _bytes_per_pixel];
return (_next_write_y_position == InputBufferBuilderHeight) ? nullptr : &_image[_write_target_pointer * _bytes_per_pixel];
}
uint16_t CRTInputBufferBuilder::get_last_write_x_position()
@ -94,7 +95,7 @@ uint16_t CRTInputBufferBuilder::get_last_write_x_position()
uint16_t CRTInputBufferBuilder::get_last_write_y_position()
{
return _write_y_position % InputBufferBuilderHeight;
return _write_y_position;
}
size_t CRTInputBufferBuilder::get_bytes_per_pixel()

6
Outputs/CRT/Internals/CRTInputBufferBuilder.hpp
View File

@ -51,11 +51,7 @@ struct CRTInputBufferBuilder {
// the buffer size
size_t _bytes_per_pixel;
// Storage for the amount of buffer uploaded so far; initialised correctly by the buffer
// builder but otherwise entrusted to the CRT to update.
unsigned int _last_uploaded_line;
bool _is_full;
// the buffer
uint8_t *_image;
};