Copied BasicExample as base for new 'DecodeOnGPU' example.

CMakeLists.txt

@@ -72,6 +72,7 @@ IF(ENABLE_EXAMPLES AND QT_QTOPENGL_FOUND)
 	ADD_SUBDIRECTORY(examples/Paging)
 	ADD_SUBDIRECTORY(examples/OpenGL)
 	ADD_SUBDIRECTORY(examples/SmoothLOD)
+	ADD_SUBDIRECTORY(examples/DecodeOnGPU)
 	ADD_SUBDIRECTORY(examples/Python)
 	SET(BUILD_EXAMPLES ON)
 ELSE()

examples/DecodeOnGPU/CMakeLists.txt

@@ -0,0 +1,74 @@
+# Copyright (c) 2010-2012 David Williams
+# 
+# This software is provided 'as-is', without any express or implied
+# warranty. In no event will the authors be held liable for any damages
+# arising from the use of this software.
+# 
+# Permission is granted to anyone to use this software for any purpose,
+# including commercial applications, and to alter it and redistribute it
+# freely, subject to the following restrictions:
+# 
+# 1. The origin of this software must not be misrepresented; you must not
+# claim that you wrote the original software. If you use this software
+# in a product, an acknowledgment in the product documentation would be
+# appreciated but is not required.
+# 
+# 2. Altered source versions must be plainly marked as such, and must not be
+# misrepresented as being the original software.
+# 
+# 3. This notice may not be removed or altered from any source
+# distribution.
+
+CMAKE_MINIMUM_REQUIRED(VERSION 2.6)
+
+PROJECT(DecodeOnGPUExample)
+
+#Projects source files
+SET(SRC_FILES
+	main.cpp
+	../common/OpenGLWidget.cpp
+)
+
+#Projects headers files	
+SET(INC_FILES	
+	OpenGLWidget.h
+)
+
+add_definitions(-DGLEW_STATIC)
+
+FIND_PACKAGE(OpenGL REQUIRED)
+
+#Tell CMake the paths for OpenGL and for PolyVox (which is just relative to our current location)
+INCLUDE_DIRECTORIES(${OPENGL_INCLUDE_DIR} ${PolyVoxCore_BINARY_DIR}/include ${PolyVoxCore_SOURCE_DIR}/include ${GLEW_SOURCE_DIR})
+LINK_DIRECTORIES(${PolyVoxCore_BINARY_DIR})
+
+#This will include the shader files inside the compiled binary
+QT4_ADD_RESOURCES(COMMON_RESOURCES_RCC ../common/example.qrc)
+
+# Put the resources in a seperate folder in Visual Studio
+SOURCE_GROUP("Resource Files" FILES ../common/example.qrc ${COMMON_RESOURCES_RCC})
+
+#Build
+ADD_EXECUTABLE(DecodeOnGPUExample ${SRC_FILES} ${COMMON_RESOURCES_RCC})
+IF(MSVC)
+	SET_TARGET_PROPERTIES(DecodeOnGPUExample PROPERTIES COMPILE_FLAGS "/W4 /wd4127")
+ENDIF(MSVC)
+TARGET_LINK_LIBRARIES(DecodeOnGPUExample glew ${QT_LIBRARIES} ${OPENGL_gl_LIBRARY} ${OPENGL_glu_LIBRARY} PolyVoxCore)
+SET_PROPERTY(TARGET DecodeOnGPUExample PROPERTY FOLDER "Examples")
+
+#Install - Only install the example in Windows
+IF(WIN32)
+	INSTALL(TARGETS DecodeOnGPUExample
+		RUNTIME DESTINATION Examples/OpenGL/bin
+		LIBRARY DESTINATION Examples/OpenGL/lib
+		ARCHIVE DESTINATION Examples/OpenGL/lib
+		COMPONENT example
+	)
+
+	#.dlls should be installed in shared builds.
+	#INSTALL(FILES ${CMAKE_CURRENT_BINARY_DIR}/../../release/PolyVoxCore.dll DESTINATION Examples/OpenGL/bin CONFIGURATIONS Release)
+	#INSTALL(FILES ${CMAKE_CURRENT_BINARY_DIR}/../../release/PolyVoxUtil.dll DESTINATION Examples/OpenGL/bin CONFIGURATIONS Release)
+	
+	#INSTALL(FILES ${CMAKE_CURRENT_BINARY_DIR}/../../debug/PolyVoxCore.dll DESTINATION Examples/OpenGL/bin CONFIGURATIONS Debug)
+	#INSTALL(FILES ${CMAKE_CURRENT_BINARY_DIR}/../../debug/PolyVoxUtil.dll DESTINATION Examples/OpenGL/bin CONFIGURATIONS Debug)
+ENDIF(WIN32)

examples/DecodeOnGPU/main.cpp

@@ -0,0 +1,95 @@
+/*******************************************************************************
+Copyright (c) 2005-2009 David Williams
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+    1. The origin of this software must not be misrepresented; you must not
+    claim that you wrote the original software. If you use this software
+    in a product, an acknowledgment in the product documentation would be
+    appreciated but is not required.
+
+    2. Altered source versions must be plainly marked as such, and must not be
+    misrepresented as being the original software.
+
+    3. This notice may not be removed or altered from any source
+    distribution. 	
+*******************************************************************************/
+
+#include "OpenGLWidget.h"
+
+#include "PolyVoxCore/CubicSurfaceExtractor.h"
+#include "PolyVoxCore/MarchingCubesSurfaceExtractor.h"
+#include "PolyVoxCore/Mesh.h"
+#include "PolyVoxCore/SimpleVolume.h"
+
+#include <QApplication>
+
+//Use the PolyVox namespace
+using namespace PolyVox;
+
+void createSphereInVolume(SimpleVolume<uint8_t>& volData, float fRadius)
+{
+	//This vector hold the position of the center of the volume
+	Vector3DFloat v3dVolCenter(volData.getWidth() / 2, volData.getHeight() / 2, volData.getDepth() / 2);
+
+	//This three-level for loop iterates over every voxel in the volume
+	for (int z = 0; z < volData.getDepth(); z++)
+	{
+		for (int y = 0; y < volData.getHeight(); y++)
+		{
+			for (int x = 0; x < volData.getWidth(); x++)
+			{
+				//Store our current position as a vector...
+				Vector3DFloat v3dCurrentPos(x,y,z);	
+				//And compute how far the current position is from the center of the volume
+				float fDistToCenter = (v3dCurrentPos - v3dVolCenter).length();
+
+				uint8_t uVoxelValue = 0;
+
+				//If the current voxel is less than 'radius' units from the center then we make it solid.
+				if(fDistToCenter <= fRadius)
+				{
+					//Our new voxel value
+					uVoxelValue = 255;
+				}
+
+				//Wrte the voxel value into the volume	
+				volData.setVoxelAt(x, y, z, uVoxelValue);
+			}
+		}
+	}
+}
+
+int main(int argc, char *argv[])
+{
+	//Create and show the Qt OpenGL window
+	QApplication app(argc, argv);
+	OpenGLWidget openGLWidget(0);
+	openGLWidget.show();
+
+	//Create an empty volume and then place a sphere in it
+	SimpleVolume<uint8_t> volData(PolyVox::Region(Vector3DInt32(0,0,0), Vector3DInt32(63, 63, 63)));
+	createSphereInVolume(volData, 30);
+
+	// Extract the surface for the specified region of the volume. Uncomment the line for the kind of surface extraction you want to see.
+	auto mesh = extractCubicMesh(&volData, volData.getEnclosingRegion());
+	//auto mesh = extractMarchingCubesMesh(&volData, volData.getEnclosingRegion());
+
+	// The surface extractor outputs the mesh in an efficient compressed format which is not directly suitable for rendering. The easiest approach is to 
+	// decode this on the CPU as shown below, though more advanced applications can upload the compressed mesh to the GPU and decompress in shader code.
+	auto decodedMesh = decode(mesh);
+
+	//Pass the surface to the OpenGL window
+	openGLWidget.addMesh(decodedMesh);
+	//openGLWidget.addMesh(mesh2);
+	openGLWidget.setViewableRegion(volData.getEnclosingRegion());
+
+	//Run the message pump.
+	return app.exec();
+}