X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;ds=inline;f=source%2Fbackends%2Fopengl%2Fquery_backend.cpp;fp=source%2Fbackends%2Fopengl%2Fquery_backend.cpp;h=b445be372696794753d7917ad9852faa80be7472;hb=160e9eea29bd10034733d59507fa1bcca36be401;hp=0000000000000000000000000000000000000000;hpb=93448d16e72e38afbaecbccf6fdedd46d6a82a73;p=libs%2Fgl.git

diff --git a/source/backends/opengl/query_backend.cpp b/source/backends/opengl/query_backend.cpp
new file mode 100644
index 00000000..b445be37
--- /dev/null
+++ b/source/backends/opengl/query_backend.cpp
@@ -0,0 +1,56 @@
+#include <stdexcept>
+#include <msp/gl/extensions/arb_occlusion_query.h>
+#include <msp/gl/extensions/arb_occlusion_query2.h>
+#include "query.h"
+#include "query_backend.h"
+
+using namespace std;
+
+namespace Msp {
+namespace GL {
+
+OpenGLQueryPool::OpenGLQueryPool(unsigned t):
+	gl_type(get_gl_query_type(t))
+{
+	if(t==OCCLUSION_QUERY)
+	{
+		static Require req(ARB_occlusion_query);
+		static Require req2(ARB_occlusion_query2);
+	}
+}
+
+OpenGLQueryPool::~OpenGLQueryPool()
+{
+	glDeleteQueries(queries.size(), queries.data());
+}
+
+void OpenGLQueryPool::resize(unsigned s)
+{
+	if(s<queries.size())
+		glDeleteQueries(queries.size()-s, queries.data()+s);
+
+	unsigned old_size = queries.size();
+	queries.resize(s);
+	if(s>old_size)
+		glGenQueries(s-old_size, queries.data()+old_size);
+}
+
+unsigned OpenGLQueryPool::get_result(unsigned i) const
+{
+	unsigned result = 0;
+	glGetQueryObjectuiv(queries[i], GL_QUERY_RESULT, &result);
+	return result;
+}
+
+
+unsigned get_gl_query_type(unsigned t)
+{
+	switch(t)
+	{
+	case OCCLUSION_QUERY: return GL_ANY_SAMPLES_PASSED;
+	default: throw invalid_argument("get_gl_query_type");
+	}
+}
+
+} // namespace GL
+} // namespace Msp