From 2b58652f0897053d4da04deb586490220ab5a774 Mon Sep 17 00:00:00 2001
From: ReinUsesLisp <reinuseslisp@airmail.cc>
Date: Sat, 27 Jul 2019 19:40:10 -0300
Subject: maxwell_3d: Slow implementation of passed samples (query 21)

Implements GL_SAMPLES_PASSED by waiting immediately for queries.
---
 src/video_core/renderer_opengl/gl_query_cache.cpp | 59 +++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 src/video_core/renderer_opengl/gl_query_cache.cpp

(limited to 'src/video_core/renderer_opengl/gl_query_cache.cpp')

diff --git a/src/video_core/renderer_opengl/gl_query_cache.cpp b/src/video_core/renderer_opengl/gl_query_cache.cpp
new file mode 100644
index 000000000..1c7dc999a
--- /dev/null
+++ b/src/video_core/renderer_opengl/gl_query_cache.cpp
@@ -0,0 +1,59 @@
+// Copyright 2019 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <glad/glad.h>
+
+#include "video_core/renderer_opengl/gl_query_cache.h"
+
+namespace OpenGL {
+
+HostCounter::HostCounter(GLenum target) {
+    query.Create(target);
+}
+
+HostCounter::~HostCounter() = default;
+
+void HostCounter::UpdateState(bool enabled) {
+    if (enabled) {
+        Enable();
+    } else {
+        Disable();
+    }
+}
+
+void HostCounter::Reset() {
+    counter = 0;
+    Disable();
+}
+
+u64 HostCounter::Query() {
+    if (!is_beginned) {
+        return counter;
+    }
+    Disable();
+    u64 value;
+    glGetQueryObjectui64v(query.handle, GL_QUERY_RESULT, &value);
+    Enable();
+
+    counter += value;
+    return counter;
+}
+
+void HostCounter::Enable() {
+    if (is_beginned) {
+        return;
+    }
+    is_beginned = true;
+    glBeginQuery(GL_SAMPLES_PASSED, query.handle);
+}
+
+void HostCounter::Disable() {
+    if (!is_beginned) {
+        return;
+    }
+    glEndQuery(GL_SAMPLES_PASSED);
+    is_beginned = false;
+}
+
+} // namespace OpenGL
-- 
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