OcclusionQuery renamed to GpuQuery, and added query modes

Former-commit-id: b36a9b623653ac9b1eb422b09b3781ef46b81aca

src/Nazara/Renderer/GpuQuery.cpp

@@ -0,0 +1,127 @@
+// Copyright (C) 2013 Jérôme Leclercq
+// This file is part of the "Nazara Engine - Renderer module"
+// For conditions of distribution and use, see copyright notice in Config.hpp
+
+#include <Nazara/Renderer/GpuQuery.hpp>
+#include <Nazara/Core/Error.hpp>
+#include <Nazara/Renderer/Config.hpp>
+#include <Nazara/Renderer/Context.hpp>
+#include <Nazara/Renderer/OpenGL.hpp>
+#include <Nazara/Renderer/Renderer.hpp>
+#include <stdexcept>
+#include <Nazara/Renderer/Debug.hpp>
+
+NzGpuQuery::NzGpuQuery() :
+m_id(0)
+{
+	if (IsSupported())
+	{
+		NzContext::EnsureContext();
+
+		glGenQueries(1, reinterpret_cast<GLuint*>(&m_id));
+	}
+	else
+	{
+		NazaraError("Occlusion queries not supported");
+		return;
+	}
+
+	#ifdef NAZARA_DEBUG
+	if (!m_id)
+	{
+		NazaraError("Failed to create occlusion query");
+		throw std::runtime_error("Constructor failed");
+	}
+	#endif
+}
+
+NzGpuQuery::~NzGpuQuery()
+{
+	if (m_id)
+	{
+		NzContext::EnsureContext();
+
+		GLuint query = static_cast<GLuint>(m_id);
+		glDeleteQueries(1, &query);
+	}
+}
+
+void NzGpuQuery::Begin(nzGpuQueryMode mode)
+{
+	#ifdef NAZARA_DEBUG
+	if (NzContext::GetCurrent() == nullptr)
+	{
+		NazaraError("No active context");
+		return;
+	}
+	#endif
+
+	#if NAZARA_RENDERER_SAFE
+	if (!IsModeSupported(mode))
+	{
+		NazaraError("Mode (0x" + NzString::Number(mode, 16) + ") not supported");
+		return;
+	}
+	#endif
+
+	glBeginQuery(NzOpenGL::QueryMode[mode], m_id);
+}
+
+void NzGpuQuery::End()
+{
+	#ifdef NAZARA_DEBUG
+	if (NzContext::GetCurrent() == nullptr)
+	{
+		NazaraError("No active context");
+		return;
+	}
+	#endif
+
+	glEndQuery(GL_SAMPLES_PASSED);
+}
+
+unsigned int NzGpuQuery::GetResult() const
+{
+	NzContext::EnsureContext();
+
+	GLuint result;
+	glGetQueryObjectuiv(m_id, GL_QUERY_RESULT, &result);
+
+	return result;
+}
+
+bool NzGpuQuery::IsResultAvailable() const
+{
+	NzContext::EnsureContext();
+
+	GLint available;
+	glGetQueryObjectiv(m_id, GL_QUERY_RESULT_AVAILABLE, &available);
+
+	return available == GL_TRUE;
+}
+
+bool NzGpuQuery::IsModeSupported(nzGpuQueryMode mode)
+{
+	switch (mode)
+	{
+		case nzGpuQueryMode_AnySamplesPassed:
+		case nzGpuQueryMode_TimeElapsed:
+			return NzOpenGL::GetVersion() >= 330;
+
+		case nzGpuQueryMode_AnySamplesPassedConservative:
+			return NzOpenGL::GetVersion() >= 430;
+
+		case nzGpuQueryMode_PrimitiveGenerated:
+		case nzGpuQueryMode_SamplesPassed:
+		case nzGpuQueryMode_TransformFeedbackPrimitivesWritten:
+			return true;
+	}
+
+	NazaraError("Gpu Query mode not handled (0x" + NzString::Number(mode, 16) + ')');
+	return false;
+}
+
+bool NzGpuQuery::IsSupported()
+{
+	return NzRenderer::HasCapability(nzRendererCap_OcclusionQuery);
+}