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glmodel.cpp
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Wed, Jan 8, 13:36

glmodel.cpp
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#include "glmodel.h"
#include <QGLShaderProgram>
#include "sktools.h"
using namespace symkit;
GLModel::GLModel()
: vbo(QGLBuffer::VertexBuffer), ibo(QGLBuffer::IndexBuffer)
{
}
GLModel::GLModel(const GLModel & init)
{
*this = init;
}
GLModel& GLModel::operator=(const GLModel& cpy)
{
vbo = cpy.vbo;
ibo = cpy.ibo;
vbo_size = cpy.vbo_size;
groups = cpy.groups;
return *this;
}
bool GLModel::enableVBO()
{
return vbo.create();
}
bool GLModel::enableIBO()
{
return ibo.create();
}
void GLModel::destroy()
{
if (vbo.isCreated())
vbo.destroy();
if (ibo.isCreated())
ibo.destroy();
}
bool GLModel::isVBOEnabled() const
{
return vbo.isCreated();
}
bool GLModel::isIBOEnabled() const
{
return ibo.isCreated();
}
GLModel::~GLModel()
{
destroy();
}
#define _USE_MATH_DEFINES
#include <cmath>
#define BUFFER_OFFSET(a) ((char*)nullptr + (a))
#include "skerror.h"
using namespace symkit;
void GLModel::draw(QGLShaderProgram *shaderProgram)
{
/* Draws the object */
/* bind buffers */
if (!vbo.bind())
throw SKError(ERR_RENDER,
"draw",
"GLModel",
"Could not bind VBO");
if (!ibo.bind())
throw SKError(ERR_RENDER,
"draw",
"GLModel",
"Could not bind IBO");
/*
* enable GL_FLOAT formatting
* set a ibo offset, ! qt magical memory workaround !
*/
shaderProgram->setAttributeBuffer(AttributeId::vertex, GL_FLOAT, 0, 3);
shaderProgram->enableAttributeArray(AttributeId::vertex);
GLuint counter = 0;
/* loop through GLGroups */
for (auto group : groups)
{
/* Finally draw onto the graphics OpenGL engine */
glDrawElements( group.primitive,
group.ibo_size / sizeof(GLuint),
GL_UNSIGNED_INT,
BUFFER_OFFSET(counter));
/* Increase elements memory counter */
counter += group.ibo_size;
}
/* Disable GL_FLOAT formatting */
shaderProgram->disableAttributeArray(AttributeId::vertex);
/* release buffers */
ibo.release();
vbo.release();
}
QGLBuffer * GLModel::vertexBuffer()
{
return &vbo;
}
QGLBuffer * GLModel::indexBuffer()
{
return &ibo;
}
void GLModel::setVboSize(GLuint size)
{
vbo_size = size;
}
GLuint GLModel::vboSize() const
{
return vbo_size;
}
void GLModel::reserveGroups(std::size_t n)
{
groups.reserve(n);
}
GLGroup * GLModel::registerGroup(GLenum type)
{
groups.push_back(GLGroup(type));
return &groups.back();
}
using namespace std;
vector<GLGroup*>& GLModel::getGroupsByPrimitive(GLenum primitive, vector<GLGroup*>& buffer)
{
for (auto& group : groups)
{
if (group.primitive == primitive)
buffer.push_back(&group);
}
return buffer;
}
void GLModel::clearGroups()
{
groups.clear();
}

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