void ModelVBO::Load(ModelOBJ obj)
{
if (obj.hasPositions())
{
glGenBuffers(1, &vertexbuffer);
glBindBuffer(GL_ARRAY_BUFFER, vertexbuffer);
glBufferData(GL_ARRAY_BUFFER, obj.getNumberOfVertices() * obj.getVertexSize(), obj.getVertexBuffer(), GL_STATIC_DRAW);
}
if (obj.hasTextureCoords())
{
glGenBuffers(1, &uvbuffer);
glBindBuffer(GL_ARRAY_BUFFER, uvbuffer);
glBufferData(GL_ARRAY_BUFFER, obj.getNumberOfVertices() * obj.getVertexSize(), obj.getVertexBuffer(), GL_STATIC_DRAW);
}
if (obj.hasNormals())
{
glGenBuffers(1, &normalbuffer);
glBindBuffer(GL_ARRAY_BUFFER, normalbuffer);
glBufferData(GL_ARRAY_BUFFER, obj.getNumberOfVertices() * obj.getVertexSize(), obj.getVertexBuffer(), GL_STATIC_DRAW);
}
if (obj.hasTangents())
{
glGenBuffers(1, &tangentbuffer);
glBindBuffer(GL_ARRAY_BUFFER, tangentbuffer);
glBufferData(GL_ARRAY_BUFFER, obj.getNumberOfVertices() * obj.getVertexSize(), obj.getVertexBuffer(), GL_STATIC_DRAW);
}
glGenBuffers(1, &elementbuffer);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, elementbuffer);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, obj.getNumberOfIndices() * obj.getIndexSize(), obj.getIndexBuffer(),
GL_STATIC_DRAW);
}
void ModelVBO::BindBuffers(ModelOBJ obj)
{
if (obj.hasPositions())
{
// 1rst attribute buffer : vertices
glEnableVertexAttribArray(0);
glBindBuffer(GL_ARRAY_BUFFER, vertexbuffer);
glVertexAttribPointer(
0, // attribute
3, // size
GL_FLOAT, // type
GL_FALSE, // normalized?
obj.getVertexSize(), // stride
(void *)0 // array buffer offset
);
}
if (obj.hasTextureCoords())
{
// 2nd attribute buffer : UVs
glEnableVertexAttribArray(1);
glBindBuffer(GL_ARRAY_BUFFER, uvbuffer);
glVertexAttribPointer(
1, // attribute
2, // size
GL_FLOAT, // type
GL_FALSE, // normalized?
obj.getVertexSize(), // stride
(void *)(3 * sizeof(float)) // array buffer offset
);
}
if (obj.hasNormals())
{
// 3rd attribute buffer : normals
glEnableVertexAttribArray(2);
glBindBuffer(GL_ARRAY_BUFFER, normalbuffer);
glVertexAttribPointer(
2, // attribute
3, // size
GL_FLOAT, // type
GL_FALSE, // normalized?
obj.getVertexSize(), // stride
(void *)(5 * sizeof(float)) // array buffer offset
);
}
if (obj.hasTangents())
{
// 4th attribute buffer : tangents
glEnableVertexAttribArray(3);
glBindBuffer(GL_ARRAY_BUFFER, tangentbuffer);
glVertexAttribPointer(
3, // attribute
4, // size
GL_FLOAT, // type
GL_FALSE, // normalized?
obj.getVertexSize(), // stride
(void *)(8 * sizeof(float)) // array buffer offset
);
}
}
