/
cpbox.cpp
136 lines (107 loc) · 3.65 KB
/
cpbox.cpp
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#include "cpbox.h"
#include "cptimer.h"
void CPBox::createShaderProgram()
{
if (!m_program) {
m_program = new QOpenGLShaderProgram();
m_program->addShaderFromSourceCode(QOpenGLShader::Vertex, m_vertexShader);
m_program->addShaderFromSourceCode(QOpenGLShader::Fragment, m_fragmentShader);
m_program->link();
}
}
void CPBox::generateVBOs()
{
m_funcs->glGenBuffers(2, m_vboIds);
}
void CPBox::ensureInitialized()
{
if(!m_funcs) {
m_funcs = new QOpenGLFunctions(QOpenGLContext::currentContext());
generateVBOs();
createShaderProgram();
}
}
void CPBox::uploadVBO()
{
ensureInitialized();
CPTimer::uploadVBO().start();
// Transfer vertex data to VBO 0
m_funcs->glBindBuffer(GL_ARRAY_BUFFER, m_vboIds[0]);
m_funcs->glBufferData(GL_ARRAY_BUFFER, m_vertices.size() * sizeof(CPPoint), &m_vertices[0], GL_STATIC_DRAW);
// Transfer index data to VBO 1
m_funcs->glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_vboIds[1]);
m_funcs->glBufferData(GL_ELEMENT_ARRAY_BUFFER, m_indices.size() * sizeof(GLushort), &m_indices[0], GL_STATIC_DRAW);
CPTimer::uploadVBO().stop();
}
void CPBox::setShaders()
{
m_vertexShader =
"attribute highp vec4 a_position;\n"
"uniform highp mat4 modelViewProjectionMatrix;\n"
"void main(void) \n"
"{ \n"
" gl_Position = modelViewProjectionMatrix * a_position;\n"
"}\n";
m_fragmentShader =
"void main(void)\n"
"{\n "
" gl_FragColor = vec4(0.7,0.5,0.3,1); \n"
"}\n";
}
CPBox::CPBox() :
m_funcs(0),
m_program(0)
{
setShaders();
}
void CPBox::render(QMatrix4x4 &modelViewProjectionMatrix)
{
if(m_vertices.size() == 0) return;
ensureInitialized();
uploadVBO();
CPTimer::rendering().start();
m_program->bind();
m_program->setUniformValue("modelViewProjectionMatrix", modelViewProjectionMatrix);
// Tell OpenGL which VBOs to use
m_funcs->glBindBuffer(GL_ARRAY_BUFFER, m_vboIds[0]);
m_funcs->glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_vboIds[1]);
// Offset for position
quintptr offset = 0;
// Tell OpenGL programmable pipeline how to locate vertex position data
int vertexLocation = m_program->attributeLocation("a_position");
m_program->enableAttributeArray(vertexLocation);
m_funcs->glVertexAttribPointer(vertexLocation, 3, GL_FLOAT, GL_FALSE, sizeof(CPPoint), (const void *)offset);
glDisable(GL_BLEND);
// Draw cube geometry using indices from VBO 1
glDisable(GL_CULL_FACE);
CPTimer::drawElements().start();
m_funcs->glDrawElements(GL_QUADS, m_indices.size(), GL_UNSIGNED_SHORT, 0);
CPTimer::drawElements().stop();
m_program->release();
CPTimer::rendering().stop();
}
CPBox::~CPBox()
{
if(m_funcs) delete m_funcs;
if(m_program) delete m_program;
}
void CPBox::update(QVector3D origin, QVector3D size)
{
float x0 = origin.x();
float x1 = x0 + size.x();
float y0 = origin.y();
float y1 = y0 + size.y();
float z0 = origin.z();
float z1 = z0 + size.z();
m_vertices.clear();
m_indices.clear();
m_vertices.push_back(CPPoint(QVector3D(x0, y0, z0)));
m_vertices.push_back(CPPoint(QVector3D(x1, y0, z0)));
m_vertices.push_back(CPPoint(QVector3D(x1, y0, z1)));
m_vertices.push_back(CPPoint(QVector3D(x0, y0, z1)));
m_vertices.push_back(CPPoint(QVector3D(x0, y1, z0)));
m_vertices.push_back(CPPoint(QVector3D(x1, y1, z0)));
m_vertices.push_back(CPPoint(QVector3D(x1, y1, z1)));
m_vertices.push_back(CPPoint(QVector3D(x0, y1, z1)));
m_indices = {0, 1, 2, 3, 1, 5, 6, 2, 4, 0, 3, 7, 5, 4, 7, 6};
}