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Avoids race condition on .is_first_in_frame

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Thomas Harte 2018-11-21 18:27:04 -05:00
parent 817aa186c2
commit 43ee540233
1 changed files with 15 additions and 15 deletions
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30
Outputs/OpenGL/ScanTarget.cpp
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@ -450,7 +450,7 @@ void ScanTarget::draw(bool synchronous, int output_width, int output_height) {
} else {
glScissor(0, 0, unprocessed_line_texture_.get_width(), final_line_to_clear);
glClear(GL_COLOR_BUFFER_BIT);
glScissor(0, first_line_to_clear, unprocessed_line_texture_.get_width(), 2048 - first_line_to_clear);
glScissor(0, first_line_to_clear, unprocessed_line_texture_.get_width(), unprocessed_line_texture_.get_height() - first_line_to_clear);
glClear(GL_COLOR_BUFFER_BIT);
}
@ -465,7 +465,7 @@ void ScanTarget::draw(bool synchronous, int output_width, int output_height) {
// Ensure the accumulation buffer is properly sized.
const int proportional_width = (output_height * 4) / 3;
if(!accumulation_texture_ || (!synchronous && (accumulation_texture_->get_width() != proportional_width || accumulation_texture_->get_height() != output_height))) {
if(!accumulation_texture_ || ( /* !synchronous && */ (accumulation_texture_->get_width() != proportional_width || accumulation_texture_->get_height() != output_height))) {
std::unique_ptr<OpenGL::TextureTarget> new_framebuffer(
new TextureTarget(
GLsizei(proportional_width),
@ -524,6 +524,19 @@ void ScanTarget::draw(bool synchronous, int output_width, int output_height) {
++spans;
}
// If this is start-of-frame, clear any untouched pixels and flush the stencil buffer
if(line_metadata_buffer_[start_line].is_first_in_frame) {
if(stencil_is_valid_) {
full_display_rectangle_.draw(0.0, 0.0, 0.0);
}
stencil_is_valid_ = true;
glClear(GL_STENCIL_BUFFER_BIT);
// Rebind the program for span output.
glBindVertexArray(line_vertex_array_);
output_shader_->bind();
}
// Upload and draw.
const auto buffer_size = spans * sizeof(Line);
if(!end_line || end_line > start_line) {
@ -545,19 +558,6 @@ void ScanTarget::draw(bool synchronous, int output_width, int output_height) {
glDrawArraysInstanced(GL_TRIANGLE_STRIP, 0, 4, GLsizei(spans));
// If this is end-of-frame, clear any untouched pixels and flush the stencil buffer
if(line_metadata_buffer_[end_line].is_first_in_frame) {
if(stencil_is_valid_) {
full_display_rectangle_.draw(0.0, 0.0, 0.0);
}
stencil_is_valid_ = true;
glClear(GL_STENCIL_BUFFER_BIT);
// Rebind the program for span output.
glBindVertexArray(line_vertex_array_);
output_shader_->bind();
}
start_line = end_line;
new_spans -= spans;
}