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refactoring: skydome visualization code extraction

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This commit is contained in:
tmj-fstate
2019-10-23 16:45:56 +02:00
parent ae40f5486f
commit bc8b3d72f3
11 changed files with 181 additions and 69 deletions
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98
openglskydome.cpp Normal file
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/*
This Source Code Form is subject to the
terms of the Mozilla Public License, v.
2.0. If a copy of the MPL was not
distributed with this file, You can
obtain one at
http://mozilla.org/MPL/2.0/.
*/
#include "stdafx.h"
#include "openglskydome.h"
#include "simulationenvironment.h"
#include "openglgeometrybank.h"
opengl_skydome::~opengl_skydome() {
if( m_vertexbuffer != 0 ) { ::glDeleteBuffers( 1, &m_vertexbuffer ); }
if( m_indexbuffer != 0 ) { ::glDeleteBuffers( 1, &m_indexbuffer ); }
if( m_coloursbuffer != 0 ) { ::glDeleteBuffers( 1, &m_coloursbuffer ); }
}
void opengl_skydome::update() {
auto &skydome { simulation::Environment.skydome() };
// cache entry state
::glPushClientAttrib( GL_CLIENT_VERTEX_ARRAY_BIT );
// setup gpu data buffers:
// ...static data...
if( m_indexbuffer == -1 ) {
::glGenBuffers( 1, &m_indexbuffer );
if( ( m_indexbuffer > 0 ) && ( m_indexbuffer != (GLuint)-1 ) ) {
::glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, m_indexbuffer );
auto const &indices { skydome.indices() };
::glBufferData( GL_ELEMENT_ARRAY_BUFFER, indices.size() * sizeof( unsigned short ), indices.data(), GL_STATIC_DRAW );
m_indexcount = indices.size();
}
}
if( m_vertexbuffer == -1 ) {
::glGenBuffers( 1, &m_vertexbuffer );
if( ( m_vertexbuffer > 0 ) && ( m_vertexbuffer != (GLuint)-1 ) ) {
::glBindBuffer( GL_ARRAY_BUFFER, m_vertexbuffer );
auto const &vertices { skydome.vertices() };
::glBufferData( GL_ARRAY_BUFFER, vertices.size() * sizeof( glm::vec3 ), vertices.data(), GL_STATIC_DRAW );
}
}
// ...and dynamic data
if( m_coloursbuffer == -1 ) {
::glGenBuffers( 1, &m_coloursbuffer );
if( ( m_coloursbuffer > 0 ) && ( m_coloursbuffer != (GLuint)-1 ) ) {
::glBindBuffer( GL_ARRAY_BUFFER, m_coloursbuffer );
auto const &colors { skydome.colors() };
::glBufferData( GL_ARRAY_BUFFER, colors.size() * sizeof( glm::vec3 ), colors.data(), GL_DYNAMIC_DRAW );
}
}
// ship the current dynamic data to the gpu
// TODO: ship the data if it changed since the last update
if( true == skydome.is_dirty() ) {
if( ( m_coloursbuffer > 0 ) && ( m_coloursbuffer != (GLuint)-1 ) ) {
::glBindBuffer( GL_ARRAY_BUFFER, m_coloursbuffer );
auto const &colors { skydome.colors() };
::glBufferSubData( GL_ARRAY_BUFFER, 0, colors.size() * sizeof( glm::vec3 ), colors.data() );
skydome.is_dirty() = false;
}
}
// cleanup
::glPopClientAttrib();
::glBindBuffer( GL_ARRAY_BUFFER, 0 );
::glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, 0 );
}
// render skydome to screen
void opengl_skydome::render() {
if( ( m_indexbuffer == 0 ) || ( m_indexbuffer == (GLuint)-1 )
|| ( m_vertexbuffer == 0 ) || ( m_vertexbuffer == (GLuint)-1 )
|| ( m_coloursbuffer == 0 ) || ( m_coloursbuffer == (GLuint)-1 ) ) {
return;
}
// setup:
::glPushClientAttrib( GL_CLIENT_VERTEX_ARRAY_BIT );
// ...positions...
::glBindBuffer( GL_ARRAY_BUFFER, m_vertexbuffer );
::glVertexPointer( 3, GL_FLOAT, sizeof( glm::vec3 ), reinterpret_cast<void const*>( 0 ) );
::glEnableClientState( GL_VERTEX_ARRAY );
// ...colours...
::glBindBuffer( GL_ARRAY_BUFFER, m_coloursbuffer );
::glColorPointer( 3, GL_FLOAT, sizeof( glm::vec3 ), reinterpret_cast<void const*>( 0 ) );
::glEnableClientState( GL_COLOR_ARRAY );
// ...indices
::glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, m_indexbuffer );
// draw
::glDrawElements( GL_TRIANGLES, static_cast<GLsizei>( m_indexcount ), GL_UNSIGNED_SHORT, reinterpret_cast<void const*>( 0 ) );
// cleanup
::glPopClientAttrib();
::glBindBuffer( GL_ARRAY_BUFFER, 0 );
::glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, 0 );
}