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Invalidates the stencil buffer upon buffer resizes.

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This commit is contained in:
Thomas Harte 2018-11-20 19:51:11 -05:00
parent f12d734957
commit 38ffc4fdb3
2 changed files with 16 additions and 3 deletions
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18
Outputs/OpenGL/ScanTarget.cpp
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@ -345,7 +345,9 @@ void ScanTarget::draw(bool synchronous, int output_width, int output_height) {
fence_ = nullptr;
}
if(is_drawing_.test_and_set()) return;
// Spin until the is-drawing flag is reset; the wait sync above will deal
// with instances where waiting is inappropriate.
while(is_drawing_.test_and_set());
// Grab the current read and submit pointers.
const auto submit_pointers = submit_pointers_.load();
@ -473,15 +475,22 @@ void ScanTarget::draw(bool synchronous, int output_width, int output_height) {
true));
if(accumulation_texture_) {
new_framebuffer->bind_framebuffer();
glClear(GL_COLOR_BUFFER_BIT);
glClear(GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
glActiveTexture(AccumulationTextureUnit);
accumulation_texture_->bind_texture();
accumulation_texture_->draw(float(output_width) / float(output_height));
glClear(GL_STENCIL_BUFFER_BIT);
new_framebuffer->bind_texture();
}
accumulation_texture_ = std::move(new_framebuffer);
// In the absence of a way to resize a stencil buffer, just mark
// what's currently present as invalid to avoid an improper clear
// for this frame.
stencil_is_valid_ = false;
}
// Figure out how many new spans are ostensible ready; use two less than that.
@ -538,7 +547,10 @@ void ScanTarget::draw(bool synchronous, int output_width, int output_height) {
// 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) {
full_display_rectangle_.draw(0.0, 0.0, 0.0);
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.

1
Outputs/OpenGL/ScanTarget.hpp
View File

@ -107,6 +107,7 @@ class ScanTarget: public Outputs::Display::ScanTarget {
// rectangle is used to ensure untouched pixels properly decay.
std::unique_ptr<TextureTarget> accumulation_texture_;
Rectangle full_display_rectangle_;
bool stencil_is_valid_ = false;
// Ephemeral state that helps in line composition.
Line *active_line_ = nullptr;