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More work on Smooth LOD.

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This commit is contained in:
David Williams
2011-07-02 18:40:34 +01:00
parent ccfa7db1fa
commit 46ac159ec1
7 changed files with 93 additions and 9 deletions
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32
examples/SmoothLOD/OpenGLWidget.cpp
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@ -34,6 +34,28 @@ void OpenGLWidget::setSurfaceMeshToRender(const PolyVox::SurfaceMesh<PositionMat
m_uEndIndex = vecIndices.size();
}
void OpenGLWidget::setSurfaceMeshToRenderLowLOD(const PolyVox::SurfaceMesh<PositionMaterialNormal>& surfaceMesh)
{
//Convienient access to the vertices and indices
const vector<uint32_t>& vecIndices = surfaceMesh.getIndices();
const vector<PositionMaterialNormal>& vecVertices = surfaceMesh.getVertices();
//Build an OpenGL index buffer
glGenBuffers(1, &indexBufferLow);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBufferLow);
const GLvoid* pIndices = static_cast<const GLvoid*>(&(vecIndices[0]));
glBufferData(GL_ELEMENT_ARRAY_BUFFER, vecIndices.size() * sizeof(uint32_t), pIndices, GL_STATIC_DRAW);
//Build an OpenGL vertex buffer
glGenBuffers(1, &vertexBufferLow);
glBindBuffer(GL_ARRAY_BUFFER, vertexBufferLow);
const GLvoid* pVertices = static_cast<const GLvoid*>(&(vecVertices[0]));
glBufferData(GL_ARRAY_BUFFER, vecVertices.size() * sizeof(PositionMaterialNormal), pVertices, GL_STATIC_DRAW);
m_uBeginIndexLow = 0;
m_uEndIndexLow = vecIndices.size();
}
void OpenGLWidget::initializeGL()
{
//We need GLEW to access recent OpenGL functionality
@ -125,6 +147,16 @@ void OpenGLWidget::paintGL()
glNormalPointer(GL_FLOAT, sizeof(PositionMaterialNormal), (GLvoid*)12);
glDrawRangeElements(GL_TRIANGLES, m_uBeginIndex, m_uEndIndex-1, m_uEndIndex - m_uBeginIndex, GL_UNSIGNED_INT, 0);
//Bind the index buffer
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBufferLow);
//Bind the vertex buffer
glBindBuffer(GL_ARRAY_BUFFER, vertexBufferLow);
glVertexPointer(3, GL_FLOAT, sizeof(PositionMaterialNormal), 0);
glNormalPointer(GL_FLOAT, sizeof(PositionMaterialNormal), (GLvoid*)12);
glDrawRangeElements(GL_TRIANGLES, m_uBeginIndexLow, m_uEndIndexLow-1, m_uEndIndexLow - m_uBeginIndexLow, GL_UNSIGNED_INT, 0);
GLenum errCode = glGetError();
if(errCode != GL_NO_ERROR)

9
examples/SmoothLOD/OpenGLWidget.h
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@ -42,6 +42,7 @@ public:
//Convert a SrfaceMesh to OpenGL index/vertex buffers
void setSurfaceMeshToRender(const PolyVox::SurfaceMesh<PolyVox::PositionMaterialNormal>& surfaceMesh);
void setSurfaceMeshToRenderLowLOD(const PolyVox::SurfaceMesh<PolyVox::PositionMaterialNormal>& surfaceMesh);
protected:
//Qt OpenGL functions
@ -53,10 +54,16 @@ private:
//Index/vertex buffer data
GLuint m_uBeginIndex;
GLuint m_uEndIndex;
GLuint noOfIndices;
//GLuint noOfIndices;
GLuint indexBuffer;
GLuint vertexBuffer;
GLuint m_uBeginIndexLow;
GLuint m_uEndIndexLow;
//GLuint noOfIndicesLow;
GLuint indexBufferLow;
GLuint vertexBufferLow;
//Mouse data
QPoint m_LastFrameMousePos;
QPoint m_CurrentMousePos;

18
examples/SmoothLOD/main.cpp
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@ -91,20 +91,26 @@ int main(int argc, char *argv[])
smoothRegion<SimpleVolume, Density8>(volData, volData.getEnclosingRegion());
smoothRegion<SimpleVolume, Density8>(volData, volData.getEnclosingRegion());
RawVolume<Density8> volDataLowLOD(PolyVox::Region(Vector3DInt32(0,0,0), Vector3DInt32(31, 31, 31)));
RawVolume<Density8> volDataLowLOD(PolyVox::Region(Vector3DInt32(0,0,0), Vector3DInt32(15, 31, 31)));
VolumeResampler<SimpleVolume, RawVolume, Density8> volumeResampler(&volData, volData.getEnclosingRegion(), &volDataLowLOD, volDataLowLOD.getEnclosingRegion());
VolumeResampler<SimpleVolume, RawVolume, Density8> volumeResampler(&volData, PolyVox::Region(Vector3DInt32(0,0,0), Vector3DInt32(31, 63, 63)), &volDataLowLOD, volDataLowLOD.getEnclosingRegion());
volumeResampler.execute();
//Extract the surface
SurfaceMesh<PositionMaterialNormal> mesh;
SurfaceExtractor<RawVolume, Density8 > surfaceExtractor(&volDataLowLOD, volDataLowLOD.getEnclosingRegion(), &mesh);
SurfaceMesh<PositionMaterialNormal> meshLowLOD;
SurfaceExtractor<RawVolume, Density8 > surfaceExtractor(&volDataLowLOD, volDataLowLOD.getEnclosingRegion(), &meshLowLOD);
surfaceExtractor.execute();
meshLowLOD.scaleVertices(2.0f);
mesh.scaleVertices(2.0f);
//Extract the surface
SurfaceMesh<PositionMaterialNormal> meshHighLOD;
SurfaceExtractor<SimpleVolume, Density8 > surfaceExtractorHigh(&volData, PolyVox::Region(Vector3DInt32(32,0,0), Vector3DInt32(63, 63, 63)), &meshHighLOD);
surfaceExtractorHigh.execute();
meshHighLOD.translateVertices(Vector3DFloat(32, 0, 0));
//Pass the surface to the OpenGL window
openGLWidget.setSurfaceMeshToRender(mesh);
openGLWidget.setSurfaceMeshToRender(meshHighLOD);
openGLWidget.setSurfaceMeshToRenderLowLOD(meshLowLOD);
//Run the message pump.
return app.exec();