45 lines
1.1 KiB
C++
45 lines
1.1 KiB
C++
#pragma once
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#include <chrono>
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#include <memory>
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#include <GL/glew.h>
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#include "nf7.hh"
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#include "common/future.hh"
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namespace nf7::gl {
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inline void Await(const std::shared_ptr<nf7::Context>& ctx,
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nf7::Future<std::monostate>::Promise& pro,
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GLsync sync) noexcept {
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const auto state = glClientWaitSync(sync, 0, 0);
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assert(0 == glGetError());
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if (state == GL_ALREADY_SIGNALED || state == GL_CONDITION_SATISFIED) {
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glDeleteSync(sync);
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pro.Return({});
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} else {
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ctx->env().ExecGL(ctx, [ctx, pro, sync]() mutable {
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Await(ctx, pro, sync);
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}, nf7::Env::Clock::now() + std::chrono::milliseconds(10));
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}
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}
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// The returned future will be finalized on GL thread.
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inline nf7::Future<std::monostate> ExecFenceSync(
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const std::shared_ptr<nf7::Context>& ctx) noexcept {
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nf7::Future<std::monostate>::Promise pro {ctx};
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ctx->env().ExecGL(ctx, [ctx, pro]() mutable {
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GLsync sync = glFenceSync(GL_SYNC_GPU_COMMANDS_COMPLETE, 0);
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assert(0 == glGetError());
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Await(ctx, pro, sync);
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});
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return pro.future();
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}
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} // namespace nf7::gl
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