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#include "Mesh.hpp"
namespace renderer {
Mesh::Mesh () : mVAO( 0 ), mVBO( 0 ), mEBO( 0 ), mVertexCount( 0 ), mIndexCount( 0 ), mMode( GL_TRIANGLES ) {}
Mesh::~Mesh () {
if( mVBO ) {
glDeleteBuffers( 1, &mVBO );
}
if( mEBO ) {
glDeleteBuffers( 1, &mEBO );
}
if( mVAO ) {
glDeleteVertexArrays( 1, &mVAO );
}
}
bool Mesh::createFromPositions ( const std::vector<float>& positions, bool lines ) {
if( positions.empty() ) {
return false;
}
mMode = lines ? GL_LINES : GL_TRIANGLES;
mVertexCount = static_cast<GLsizei>( positions.size() / 3 );
glGenVertexArrays( 1, &mVAO );
glGenBuffers( 1, &mVBO );
glBindVertexArray( mVAO );
glBindBuffer( GL_ARRAY_BUFFER, mVBO );
glBufferData( GL_ARRAY_BUFFER, positions.size() * sizeof( float ), positions.data(), GL_STATIC_DRAW );
glEnableVertexAttribArray( 0 );
glVertexAttribPointer( 0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof( float ), (void*)0 );
glBindVertexArray( 0 );
return true;
}
bool Mesh::createFromPosTex ( const std::vector<float>& data ) {
if( data.empty() )
return false;
const size_t strideFloats = 5;
mMode = GL_TRIANGLES;
mVertexCount = static_cast<GLsizei>( data.size() / strideFloats );
glGenVertexArrays( 1, &mVAO );
glGenBuffers( 1, &mVBO );
glBindVertexArray( mVAO );
glBindBuffer( GL_ARRAY_BUFFER, mVBO );
glBufferData( GL_ARRAY_BUFFER, data.size() * sizeof( float ), data.data(), GL_STATIC_DRAW );
glEnableVertexAttribArray( 0 );
glVertexAttribPointer( 0, 3, GL_FLOAT, GL_FALSE, strideFloats * sizeof( float ), (void*)0 );
glEnableVertexAttribArray( 1 );
glVertexAttribPointer( 1, 2, GL_FLOAT, GL_FALSE, strideFloats * sizeof( float ),
(void*)( 3 * sizeof( float ) ) );
glBindVertexArray( 0 );
return true;
}
bool Mesh::createFromPosTexNormal ( const std::vector<float>& data ) {
if( data.empty() )
return false;
const size_t strideFloats = 8;
mMode = GL_TRIANGLES;
mVertexCount = static_cast<GLsizei>( data.size() / strideFloats );
glGenVertexArrays( 1, &mVAO );
glGenBuffers( 1, &mVBO );
glBindVertexArray( mVAO );
glBindBuffer( GL_ARRAY_BUFFER, mVBO );
glBufferData( GL_ARRAY_BUFFER, data.size() * sizeof( float ), data.data(), GL_STATIC_DRAW );
glEnableVertexAttribArray( 0 );
glVertexAttribPointer( 0, 3, GL_FLOAT, GL_FALSE, strideFloats * sizeof( float ), (void*)0 );
glEnableVertexAttribArray( 1 );
glVertexAttribPointer( 1, 2, GL_FLOAT, GL_FALSE, strideFloats * sizeof( float ),
(void*)( 3 * sizeof( float ) ) );
glEnableVertexAttribArray( 2 );
glVertexAttribPointer( 2, 3, GL_FLOAT, GL_FALSE, strideFloats * sizeof( float ),
(void*)( 5 * sizeof( float ) ) );
glBindVertexArray( 0 );
return true;
}
bool Mesh::createFromPosTexNormalIndexed ( const std::vector<float>& data,
const std::vector<unsigned int>& indices ) {
if( data.empty() || indices.empty() )
return false;
const size_t strideFloats = 8;
mMode = GL_TRIANGLES;
mVertexCount = static_cast<GLsizei>( data.size() / strideFloats );
mIndexCount = static_cast<GLsizei>( indices.size() );
glGenVertexArrays( 1, &mVAO );
glGenBuffers( 1, &mVBO );
glGenBuffers( 1, &mEBO );
glBindVertexArray( mVAO );
glBindBuffer( GL_ARRAY_BUFFER, mVBO );
glBufferData( GL_ARRAY_BUFFER, data.size() * sizeof( float ), data.data(), GL_STATIC_DRAW );
glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, mEBO );
glBufferData( GL_ELEMENT_ARRAY_BUFFER, indices.size() * sizeof( unsigned int ), indices.data(),
GL_STATIC_DRAW );
glEnableVertexAttribArray( 0 );
glVertexAttribPointer( 0, 3, GL_FLOAT, GL_FALSE, strideFloats * sizeof( float ), (void*)0 );
glEnableVertexAttribArray( 1 );
glVertexAttribPointer( 1, 2, GL_FLOAT, GL_FALSE, strideFloats * sizeof( float ),
(void*)( 3 * sizeof( float ) ) );
glEnableVertexAttribArray( 2 );
glVertexAttribPointer( 2, 3, GL_FLOAT, GL_FALSE, strideFloats * sizeof( float ),
(void*)( 5 * sizeof( float ) ) );
glBindVertexArray( 0 );
return true;
}
void Mesh::draw () const {
if( mVAO == 0 )
return;
glBindVertexArray( mVAO );
if( mEBO && mIndexCount > 0 ) {
glDrawElements( mMode, mIndexCount, GL_UNSIGNED_INT, 0 );
} else {
glDrawArrays( mMode, 0, mVertexCount );
}
glBindVertexArray( 0 );
}
} // namespace renderer
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