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skydome optimization, vsync .ini setting

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tmj-fstate
2017-03-02 17:16:29 +01:00
parent 146d6b036d
commit ab9a8835d6
4 changed files with 60 additions and 83 deletions
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56
skydome.cpp
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@@ -78,49 +78,44 @@ void CSkyDome::Generate() {
float const offset = 0.1f * radius; // horizontal offset, a cheap way to prevent a gap between ground and horizon
// create geometry chunk
int const latitudes = m_tesselation / 2;
int const latitudes = m_tesselation / 2 / 2; // half-sphere only
int const longitudes = m_tesselation;
std::uint16_t index = 0;
for( int i = 0; i < latitudes; ++i ) {
for( int i = 0; i <= latitudes; ++i ) {
float lat0 = M_PI * ( -0.5f + (float)( i ) / latitudes );
float z0 = std::sin( lat0 );
float zr0 = std::cos( lat0 );
float const latitude = M_PI * ( -0.5f + (float)( i ) / latitudes / 2 ); // half-sphere only
float const z = std::sin( latitude );
float const zr = std::cos( latitude );
float lat1 = M_PI * ( -0.5f + (float)( i + 1 ) / latitudes );
float z1 = std::sin( lat1 );
float zr1 = std::cos( lat1 );
for( int j = 0; j <= longitudes; ++j ) {
// quad strip
for( int j = 0; j <= longitudes / 2; ++j ) {
float const longitude = 2.0 * M_PI * (float)( j ) / longitudes;
float const x = std::cos( longitude );
float const y = std::sin( longitude );
/*
m_vertices.emplace_back( float3( x * zr, y * zr - offset, z ) * radius );
// we aren't using normals, but the code is left here in case it's ever needed
// m_normals.emplace_back( float3( x * zr, -y * zr, -z ) );
*/
// cartesian to opengl swap: -x, -z, -y
m_vertices.emplace_back( float3( -x * zr, -z - offset, -y * zr ) * radius );
m_colours.emplace_back( float3( 0.75f, 0.75f, 0.75f ) ); // placeholder
float longitude = 2.0 * M_PI * (float)( j ) / longitudes;
float x = std::cos( longitude );
float y = std::sin( longitude );
m_vertices.emplace_back( float3( x * zr0, y * zr0 - offset, z0 ) * radius );
// m_normals.emplace_back( float3( -x * zr0, -y * zr0, -z0 ) );
m_colours.emplace_back( float3( 0.75f, 0.75f, 0.75f ) );
m_vertices.emplace_back( float3( x * zr1, y * zr1 - offset, z1 ) * radius );
// m_normals.emplace_back( float3( -x * zr1, -y * zr1, -z1 ) );
m_colours.emplace_back( float3( 0.75f, 0.75f, 0.75f ) );
if( j == 0 ) {
// beginning of the strip, don't start indices yet
index += 2;
if( (i == 0) || (j == 0) ) {
// initial edge of the dome, don't start indices yet
++index;
}
else {
// indices for two triangles
m_indices.emplace_back( index - 2 );
// indices for two triangles, formed between current and previous latitude
m_indices.emplace_back( index - 1 - (longitudes + 1) );
m_indices.emplace_back( index - 1 );
m_indices.emplace_back( index );
m_indices.emplace_back( index );
m_indices.emplace_back( index - 1 );
m_indices.emplace_back( index + 1 );
index += 2;
m_indices.emplace_back( index - ( longitudes + 1 ) );
m_indices.emplace_back( index - 1 - ( longitudes + 1 ) );
++index;
}
}
}
@@ -152,6 +147,7 @@ void CSkyDome::Render() {
::glGenBuffers( 1, &m_indexbuffer );
::glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, m_indexbuffer );
::glBufferData( GL_ELEMENT_ARRAY_BUFFER, m_indices.size() * sizeof( unsigned short ), m_indices.data(), GL_STATIC_DRAW );
// NOTE: vertex and index source data is superfluous past this point, but, eh
}
// begin
::glEnableClientState( GL_VERTEX_ARRAY );