FreeFlyCamera::FreeFlyCamera(glm::vec3 position, float nearDistance, float farDistance, float verticalFieldOfView, double leafSize){
m_Position = position;
m_fPhi = PI;
m_fTheta = 0;
m_leafSize = leafSize;
m_nearDistance = nearDistance;
m_farDistance = farDistance;
m_verticalFieldOfView = verticalFieldOfView;
m_frustumNearPlanePoint = glm::vec3(0.f, 0.f, 0.f);
m_frustumFarPlanePoint = glm::vec3(0.f, 0.f, 0.f);
m_frustumTopPlanePoint = glm::vec3(0.f, 0.f, 0.f);
m_frustumRightPlanePoint = glm::vec3(0.f, 0.f, 0.f);
m_frustumBottomPlanePoint = glm::vec3(0.f, 0.f, 0.f);
m_frustumLeftPlanePoint = glm::vec3(0.f, 0.f, 0.f);
m_frustumNearPlaneNormal = glm::vec3(0.f, 0.f, 0.f);
m_frustumFarPlaneNormal = glm::vec3(0.f, 0.f, 0.f);
m_frustumTopPlaneNormal = glm::vec3(0.f, 0.f, 0.f);
m_frustumRightPlaneNormal = glm::vec3(0.f, 0.f, 0.f);
m_frustumBottomPlaneNormal = glm::vec3(0.f, 0.f, 0.f);
m_frustumLeftPlaneNormal = glm::vec3(0.f, 0.f, 0.f);
computeDirectionVectors();
computeFrustumPlanes();
}
void TerrainTessellation::draw(void)
{
glClearColor( 0.7f, 0.8f, 1.0f, 1.0f);
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glEnable(GL_DEPTH_TEST);
//
// Compute matrices without the legacy matrix stack support
//
nv::matrix4f projectionMatrix;
nv::perspective( projectionMatrix, 45.0f * 2.0f*NV_PI / 360.0f, (float)m_width/(float)m_height, 0.01f, 100.0f);
nv::matrix4f invProjection = nv::inverse(projectionMatrix);
nv::matrix4f viewMatrix;
viewMatrix = m_transformer->getModelViewMat();
nv::matrix4f invView = nv::inverse(viewMatrix);
// compute frustum planes for culling
nv::vec4f frustumPlanes[6];
computeFrustumPlanes(viewMatrix, projectionMatrix, frustumPlanes);
glViewport(0, 0, m_width, m_height);
glBindProgramPipeline(0);
//
// update struct representing UBO
//
mParams.ModelView = viewMatrix;
mParams.ModelViewProjection= projectionMatrix * viewMatrix;
mParams.Projection = projectionMatrix;
mParams.InvProjection = invProjection;
mParams.InvView = invView;
mParams.cull = mCull;
mParams.lod = mLod;
mParams.viewport = nv::vec4f(0.0, 0.0, (float) m_width, (float) m_height);
mParams.lightDirWorld = mLightDir;
mParams.lightDir = nv::vec3f(viewMatrix * nv::vec4f(normalize(mLightDir), 0.0)); // transform to eye space
mParams.smoothNormals = mSmoothNormals;
mParams.time = mTime;
mParams.eyePosWorld = invView * nv::vec4f(0.0f, 0.0f, 0.0f, 1.0f);
if (mAnimate) {
mParams.translate.y -= getFrameDeltaTime()*2.0f;
}
for(int i=0; i<6; i++) {
mParams.frustumPlanes[i] = frustumPlanes[i];
}
// bind the buffer for the UBO, and update it with the latest values from the CPU-side struct
glBindBufferBase( GL_UNIFORM_BUFFER, 1, mUBO);
glBindBuffer( GL_UNIFORM_BUFFER, mUBO);
glBufferSubData( GL_UNIFORM_BUFFER, 0, sizeof(TessellationParams), &mParams);
// enable / disable wireframe
glPolygonMode( GL_FRONT_AND_BACK, mWireframe ? GL_LINE : GL_FILL);
// query number of primitives
glBeginQuery(GL_PRIMITIVES_GENERATED, mGPUQuery);
drawTerrain();
glEndQuery(GL_PRIMITIVES_GENERATED);
glPolygonMode( GL_FRONT_AND_BACK, GL_FILL);
drawSky();
// update triangle count so we can display in UI
glGetQueryObjectuiv(mGPUQuery, GL_QUERY_RESULT, &mNumPrimitives);
mStatsText->SetValue(mNumPrimitives);
if (mReload) {
loadShaders();
mReload = false;
mTweakBar->syncValues();
}
}
void FreeFlyCamera::rotateUp(float degree){
m_fTheta = glm::radians(degree);
computeDirectionVectors();
computeFrustumPlanes();
}
void FreeFlyCamera::moveFront(float const t){
m_Position += glm::vec3(t * m_FrontVector.x, t * m_FrontVector.y, t * m_FrontVector.z);
computeFrustumPlanes();
}
void FreeFlyCamera::resetView(float theta, float phi){
m_fTheta = theta;
m_fPhi = phi;
computeDirectionVectors();
computeFrustumPlanes();
}
