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build 180923. basic precipitation visualization system, minor bug fixes
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tmj-fstate
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precipitation.cpp
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197
precipitation.cpp
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/*
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This Source Code Form is subject to the
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terms of the Mozilla Public License, v.
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2.0. If a copy of the MPL was not
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distributed with this file, You can
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obtain one at
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http://mozilla.org/MPL/2.0/.
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*/
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#include "stdafx.h"
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#include "precipitation.h"
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#include "globals.h"
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#include "openglmatrixstack.h"
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#include "renderer.h"
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#include "timer.h"
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#include "simulation.h"
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#include "train.h"
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basic_precipitation::~basic_precipitation() {
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// TODO: release allocated resources
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}
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void
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basic_precipitation::create( int const Tesselation ) {
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auto const heightfactor { 10.f }; // height-to-radius factor
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m_moverate *= heightfactor;
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auto const verticaltexturestretchfactor { 1.5f }; // crude motion blur
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// create geometry chunk
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auto const latitudes { 3 }; // just a cylinder with end cones
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auto const longitudes { Tesselation };
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auto const longitudehalfstep { 0.5f * static_cast<float>( 2.0 * M_PI * 1.f / longitudes ) }; // for crude uv correction
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std::uint16_t index = 0;
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// auto const radius { 25.f }; // cylinder radius
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std::vector<float> radii { 25.f, 10.f, 5.f, 1.f };
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for( auto radius : radii ) {
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for( int i = 0; i <= latitudes; ++i ) {
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auto const latitude{ static_cast<float>( M_PI * ( -0.5f + (float)( i ) / latitudes ) ) };
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auto const z{ std::sin( latitude ) };
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auto const zr{ std::cos( latitude ) };
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for( int j = 0; j <= longitudes; ++j ) {
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// NOTE: for the first and last row half of the points we create end up unused but, eh
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auto const longitude{ static_cast<float>( 2.0 * M_PI * (float)( j ) / longitudes ) };
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auto const x{ std::cos( longitude ) };
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auto const y{ std::sin( longitude ) };
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// NOTE: cartesian to opengl swap would be: -x, -z, -y
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m_vertices.emplace_back( glm::vec3( -x * zr, -z * heightfactor, -y * zr ) * radius );
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// uvs
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// NOTE: first and last row receives modified u values to deal with limitation of mapping onto triangles
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auto u = (
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i == 0 ? longitude + longitudehalfstep :
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i == latitudes ? longitude - longitudehalfstep :
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longitude );
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m_uvs.emplace_back(
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u / ( 2.0 * M_PI ) * radius,
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1.f - (float)( i ) / latitudes * radius * heightfactor * 0.5f / verticaltexturestretchfactor );
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if( ( i == 0 ) || ( j == 0 ) ) {
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// initial edge of the dome, don't start indices yet
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++index;
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}
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else {
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// the end cones are built from one triangle of each quad, the middle rows use both
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if( i < latitudes ) {
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m_indices.emplace_back( index - 1 - ( longitudes + 1 ) );
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m_indices.emplace_back( index - 1 );
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m_indices.emplace_back( index );
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}
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if( i > 1 ) {
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m_indices.emplace_back( index );
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m_indices.emplace_back( index - ( longitudes + 1 ) );
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m_indices.emplace_back( index - 1 - ( longitudes + 1 ) );
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}
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++index;
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}
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} // longitude
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} // latitude
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} // radius
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}
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bool
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basic_precipitation::init() {
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create( 18 );
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// TODO: select texture based on current overcast level
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if( Global.Weather == "rain:" ) {
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m_texture = GfxRenderer.Fetch_Texture( "fx/rain_medium" );
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m_moverateweathertypefactor = 2.f;
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}
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else if( Global.Weather == "snow:" ) {
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m_texture = GfxRenderer.Fetch_Texture( "fx/snow_medium" );
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m_moverateweathertypefactor = 1.25f;
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}
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return true;
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}
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void
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basic_precipitation::update() {
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auto const timedelta { static_cast<float>( ( DebugModeFlag ? Timer::GetDeltaTime() : Timer::GetDeltaTime() ) ) };
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if( timedelta == 0.0 ) { return; }
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m_textureoffset += m_moverate * m_moverateweathertypefactor * timedelta;
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m_textureoffset = clamp_circular( m_textureoffset, 1.f );
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auto cameramove { glm::dvec3{ Global.pCamera.Pos - m_camerapos} };
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cameramove.y = 0.0; // vertical movement messes up vector calculation
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m_camerapos = Global.pCamera.Pos;
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// intercept sudden user-induced camera jumps
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if( m_freeflymode != FreeFlyModeFlag ) {
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m_freeflymode = FreeFlyModeFlag;
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if( true == m_freeflymode ) {
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// cache last precipitation vector in the cab
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m_cabcameramove = m_cameramove;
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// don't carry previous precipitation vector to a new unrelated location
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m_cameramove = glm::dvec3{ 0.0 };
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}
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else {
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// restore last cached precipitation vector
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m_cameramove = m_cabcameramove;
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}
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cameramove = glm::dvec3{ 0.0 };
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}
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if( m_windowopen != Global.CabWindowOpen ) {
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m_windowopen = Global.CabWindowOpen;
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cameramove = glm::dvec3{ 0.0 };
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}
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if( ( simulation::Train != nullptr ) && ( simulation::Train->iCabn != m_activecab ) ) {
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m_activecab = simulation::Train->iCabn;
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cameramove = glm::dvec3{ 0.0 };
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}
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if( glm::length( cameramove ) > 100.0 ) {
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cameramove = glm::dvec3{ 0.0 };
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}
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m_cameramove = m_cameramove * std::max( 0.0, 1.0 - 5.0 * timedelta ) + cameramove * ( 30.0 * timedelta );
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if( std::abs( m_cameramove.x ) < 0.001 ) { m_cameramove.x = 0.0; }
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if( std::abs( m_cameramove.y ) < 0.001 ) { m_cameramove.y = 0.0; }
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if( std::abs( m_cameramove.z ) < 0.001 ) { m_cameramove.z = 0.0; }
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}
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void
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basic_precipitation::render() {
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GfxRenderer.Bind_Texture( m_texture );
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// cache entry state
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::glPushClientAttrib( GL_CLIENT_VERTEX_ARRAY_BIT );
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if( m_vertexbuffer == -1 ) {
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// build the buffers
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::glGenBuffers( 1, &m_vertexbuffer );
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::glBindBuffer( GL_ARRAY_BUFFER, m_vertexbuffer );
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::glBufferData( GL_ARRAY_BUFFER, m_vertices.size() * sizeof( glm::vec3 ), m_vertices.data(), GL_STATIC_DRAW );
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::glGenBuffers( 1, &m_uvbuffer );
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::glBindBuffer( GL_ARRAY_BUFFER, m_uvbuffer );
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::glBufferData( GL_ARRAY_BUFFER, m_uvs.size() * sizeof( glm::vec2 ), m_uvs.data(), GL_STATIC_DRAW );
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::glGenBuffers( 1, &m_indexbuffer );
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::glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, m_indexbuffer );
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::glBufferData( GL_ELEMENT_ARRAY_BUFFER, m_indices.size() * sizeof( unsigned short ), m_indices.data(), GL_STATIC_DRAW );
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// NOTE: vertex and index source data is superfluous past this point, but, eh
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}
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// positions
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::glBindBuffer( GL_ARRAY_BUFFER, m_vertexbuffer );
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::glVertexPointer( 3, GL_FLOAT, sizeof( glm::vec3 ), reinterpret_cast<void const*>( 0 ) );
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::glEnableClientState( GL_VERTEX_ARRAY );
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// uvs
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::glBindBuffer( GL_ARRAY_BUFFER, m_uvbuffer );
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::glClientActiveTexture( m_textureunit );
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::glTexCoordPointer( 2, GL_FLOAT, sizeof( glm::vec2 ), reinterpret_cast<void const*>( 0 ) );
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::glEnableClientState( GL_TEXTURE_COORD_ARRAY );
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// uv transformation matrix
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::glMatrixMode( GL_TEXTURE );
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::glLoadIdentity();
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::glTranslatef( 0.f, m_textureoffset, 0.f );
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// indices
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::glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, m_indexbuffer );
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::glDrawElements( GL_TRIANGLES, static_cast<GLsizei>( m_indices.size() ), GL_UNSIGNED_SHORT, reinterpret_cast<void const*>( 0 ) );
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// cleanup
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::glLoadIdentity();
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::glMatrixMode( GL_MODELVIEW );
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::glPopClientAttrib();
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}
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