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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)