void Renderer::render()
{
QMutexLocker locker(&m_windowLock);
if (m_windows.isEmpty())
return;
HelloWindow *surface = m_windows.at(m_currentWindow);
QColor color = surface->color();
m_currentWindow = (m_currentWindow + 1) % m_windows.size();
if (!m_context->makeCurrent(surface))
return;
QSize viewSize = surface->size();
locker.unlock();
if (!m_initialized) {
initialize();
m_initialized = true;
}
QOpenGLFunctions *f = m_context->functions();
f->glViewport(0, 0, viewSize.width() * surface->devicePixelRatio(), viewSize.height() * surface->devicePixelRatio());
f->glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
f->glClearColor(m_backgroundColor.redF(), m_backgroundColor.greenF(), m_backgroundColor.blueF(), m_backgroundColor.alphaF());
f->glFrontFace(GL_CW);
f->glCullFace(GL_FRONT);
f->glEnable(GL_CULL_FACE);
f->glEnable(GL_DEPTH_TEST);
m_program->bind();
m_vbo.bind();
m_program->enableAttributeArray(vertexAttr);
m_program->enableAttributeArray(normalAttr);
m_program->setAttributeBuffer(vertexAttr, GL_FLOAT, 0, 3);
const int verticesSize = vertices.count() * 3 * sizeof(GLfloat);
m_program->setAttributeBuffer(normalAttr, GL_FLOAT, verticesSize, 3);
QMatrix4x4 modelview;
modelview.rotate(m_fAngle, 0.0f, 1.0f, 0.0f);
modelview.rotate(m_fAngle, 1.0f, 0.0f, 0.0f);
modelview.rotate(m_fAngle, 0.0f, 0.0f, 1.0f);
modelview.translate(0.0f, -0.2f, 0.0f);
m_program->setUniformValue(matrixUniform, modelview);
m_program->setUniformValue(colorUniform, color);
m_context->functions()->glDrawArrays(GL_TRIANGLES, 0, vertices.size());
m_context->swapBuffers(surface);
m_fAngle += 1.0f;
QTimer::singleShot(0, this, SLOT(render()));
}
void QtRenderer::initialize()
{
QOpenGLShader *vshader = new QOpenGLShader(QOpenGLShader::Vertex, this);
vshader->compileSourceCode(
"attribute highp vec4 vertex;"
"attribute mediump vec3 normal;"
"uniform mediump mat4 matrix;"
"uniform lowp vec4 sourceColor;"
"varying mediump vec4 color;"
"void main(void)"
"{"
" vec3 toLight = normalize(vec3(0.0, 0.3, 1.0));"
" float angle = max(dot(normal, toLight), 0.0);"
" vec3 col = sourceColor.rgb;"
" color = vec4(col * 0.2 + col * 0.8 * angle, 1.0);"
" color = clamp(color, 0.0, 1.0);"
" gl_Position = matrix * vertex;"
"}");
QOpenGLShader *fshader = new QOpenGLShader(QOpenGLShader::Fragment, this);
fshader->compileSourceCode(
"varying mediump vec4 color;"
"void main(void)"
"{"
" gl_FragColor = color;"
"}");
m_program = new QOpenGLShaderProgram(this);
m_program->addShader(vshader);
m_program->addShader(fshader);
m_program->link();
m_program->bind();
vertexAttr = m_program->attributeLocation("vertex");
normalAttr = m_program->attributeLocation("normal");
matrixUniform = m_program->uniformLocation("matrix");
colorUniform = m_program->uniformLocation("sourceColor");
m_fAngle = 0;
createGeometry();
m_vbo.create();
m_vbo.bind();
const int verticesSize = vertices.count() * 3 * sizeof(GLfloat);
m_vbo.allocate(verticesSize * 2);
m_vbo.write(0, vertices.constData(), verticesSize);
m_vbo.write(verticesSize, normals.constData(), verticesSize);
QOpenGLFunctions *f = m_context->functions();
f->glClearColor(0.1f, 0.1f, 0.2f, 1.0f);
f->glFrontFace(GL_CW);
f->glCullFace(GL_FRONT);
f->glEnable(GL_CULL_FACE);
f->glEnable(GL_DEPTH_TEST);
m_program->enableAttributeArray(vertexAttr);
m_program->enableAttributeArray(normalAttr);
m_program->setAttributeBuffer(vertexAttr, GL_FLOAT, 0, 3);
m_program->setAttributeBuffer(normalAttr, GL_FLOAT, verticesSize, 3);
}
void Renderer::render()
{
QMutexLocker locker(&m_windowLock);
if (m_windows.isEmpty())
return;
HelloWindow *surface = m_windows.at(m_currentWindow);
QColor color = surface->color();
m_currentWindow = (m_currentWindow + 1) % m_windows.size();
if (!m_context->makeCurrent(surface))
return;
QSize viewSize = surface->size();
locker.unlock();
if (!m_initialized) {
initialize();
m_initialized = true;
}
QOpenGLFunctions *f = m_context->functions();
f->glViewport(0, 0, viewSize.width() * surface->devicePixelRatio(), viewSize.height() * surface->devicePixelRatio());
f->glClearColor(0.1f, 0.1f, 0.2f, 1.0f);
f->glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
f->glFrontFace(GL_CW);
f->glCullFace(GL_FRONT);
f->glEnable(GL_CULL_FACE);
f->glEnable(GL_DEPTH_TEST);
QMatrix4x4 modelview;
modelview.rotate(m_fAngle, 0.0f, 1.0f, 0.0f);
modelview.rotate(m_fAngle, 1.0f, 0.0f, 0.0f);
modelview.rotate(m_fAngle, 0.0f, 0.0f, 1.0f);
modelview.translate(0.0f, -0.2f, 0.0f);
m_program->bind();
m_program->setUniformValue(matrixUniform, modelview);
m_program->setUniformValue(colorUniform, color);
paintQtLogo();
m_program->release();
f->glDisable(GL_DEPTH_TEST);
f->glDisable(GL_CULL_FACE);
m_context->swapBuffers(surface);
m_fAngle += 1.0f;
QTimer::singleShot(0, this, SLOT(render()));
}