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Merge pull request #9 from TomHarte/RollingBlackLine

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Found and fixed off-by-one error.
This commit is contained in:
Thomas Harte 2016-05-09 21:16:58 -04:00
commit 4592458ea0
1 changed files with 12 additions and 6 deletions
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18
Outputs/CRT/Internals/CRTOpenGL.cpp
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@ -41,7 +41,7 @@ struct Range {
GLsizei location, length;
};
static int getCircularRanges(GLsizei *start_pointer, GLsizei *end_pointer, GLsizei buffer_length, GLsizei granularity, Range *ranges)
static int getCircularRanges(GLsizei *start_pointer, GLsizei *end_pointer, GLsizei buffer_length, GLsizei granularity, GLsizei offset, Range *ranges)
{
GLsizei start = *start_pointer;
GLsizei end = *end_pointer;
@ -49,6 +49,8 @@ static int getCircularRanges(GLsizei *start_pointer, GLsizei *end_pointer, GLsiz
*end_pointer %= buffer_length;
*start_pointer = *end_pointer;
start += offset;
end += offset;
start -= start%granularity;
end -= end%granularity;
@ -195,11 +197,6 @@ void OpenGLOutputBuilder::draw_frame(unsigned int output_width, unsigned int out
set_colour_space_uniforms();
}
// determine how many lines are newly reclaimed; they'll need to be cleared
Range clearing_zones[2];
int number_of_clearing_zones = getCircularRanges(&_cleared_composite_output_y, &_composite_src_output_y, IntermediateBufferHeight, 1, clearing_zones);
uint16_t completed_texture_y = _buffer_builder->get_and_finalise_current_line();
if(_fence != nullptr)
{
glClientWaitSync(_fence, GL_SYNC_FLUSH_COMMANDS_BIT, GL_TIMEOUT_IGNORED);
@ -212,6 +209,15 @@ void OpenGLOutputBuilder::draw_frame(unsigned int output_width, unsigned int out
// bind and flush the source array buffer
GLsizei submitted_source_data = submitArrayData(source_array_buffer, _source_buffer_data.get(), &_source_buffer_data_pointer, 2*SourceVertexSize);
// 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)
{