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Attempts to fix random stray noise lines.

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This commit is contained in:
Thomas Harte 2018-11-17 23:27:25 -05:00
parent c5d9bf2c12
commit 6496b6313c
1 changed files with 6 additions and 6 deletions
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12
Outputs/OpenGL/ScanTarget.cpp
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@ -300,8 +300,6 @@ void ScanTarget::announce(Event event, uint16_t x, uint16_t y) {
// Attempt to allocate a new line; note allocation failure if necessary.
const auto next_line = uint16_t((write_pointers_.line + 1) % LineBufferHeight);
// Check whether that's too many.
if(next_line == read_pointers.line) {
allocation_has_failed_ = true;
active_line_ = nullptr;
@ -335,12 +333,14 @@ template <typename T> void ScanTarget::patch_buffer(const T &array, GLuint targe
);
assert(destination);
// Populate it with the oldest scans first; the oldest are those from 1 beyond the submit pointer.
// Populate it with the oldest data first; the oldest are those from two beyond the submit pointer;
// one beyond is the one that may currently be mutating.
const uint16_t oldest_record = (submit_pointer + 2) % array.size();
const size_t buffer_length = array.size() * sizeof(array[0]);
const size_t splice_point = (submit_pointer + 1) * sizeof(array[0]);
const size_t splice_point = oldest_record * sizeof(array[0]);
const size_t end_length = buffer_length - splice_point;
memcpy(&destination[0], &array[submit_pointer+1], end_length);
memcpy(&destination[0], &array[oldest_record], end_length);
memcpy(&destination[end_length], &array[0], buffer_length - end_length);
// Flush and unmap the buffer.
@ -486,7 +486,7 @@ void ScanTarget::draw(bool synchronous, int output_width, int output_height) {
glBindVertexArray(line_vertex_array_);
output_shader_->bind();
glEnable(GL_BLEND);
glDrawArraysInstanced(GL_TRIANGLE_STRIP, 0, 4, GLsizei(line_buffer_.size() - 1));
glDrawArraysInstanced(GL_TRIANGLE_STRIP, 0, 4, GLsizei(line_buffer_.size() - 2));
// All data now having been spooled to the GPU, update the read pointers to
// the submit pointer location.