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()));
}
void ShaderEffectSource::bind()
{
GLint filtering = smooth() ? GL_LINEAR : GL_NEAREST;
GLuint hwrap = (m_wrapMode == Repeat || m_wrapMode == RepeatHorizontally) ? GL_REPEAT : GL_CLAMP_TO_EDGE;
GLuint vwrap = (m_wrapMode == Repeat || m_wrapMode == RepeatVertically) ? GL_REPEAT : GL_CLAMP_TO_EDGE;
QOpenGLContext *context = QOpenGLContext::currentContext();
QOpenGLFunctions *f = context->functions();
if (!context->isOpenGLES())
f->glEnable(GL_TEXTURE_2D);
if (m_fbo && m_fbo->isValid()) {
f->glBindTexture(GL_TEXTURE_2D, m_fbo->texture());
} else {
m_dirtyTexture = true;
emit repaintRequired();
markSourceItemDirty();
f->glBindTexture(GL_TEXTURE_2D, 0);
}
f->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filtering);
f->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, smooth() ? GL_LINEAR : GL_NEAREST);
f->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, hwrap);
f->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, vwrap);
}
void GLTerrainRect::render()
{
if(!initalised())
initGL();
QOpenGLFunctions * f = QOpenGLContext::currentContext()->functions();
f->glEnable(GL_BLEND);CE();
f->glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);CE();
m_vao_constraints.bind();CE();
f->glDrawElements(GL_TRIANGLE_STRIP, m_indicies.size(), GL_UNSIGNED_INT, (void*)(0)); CE();CE();
m_vao_constraints.release();CE();
f->glDisable(GL_BLEND);CE();
}
void Shader::updateState(const RenderState &state, QSGMaterial *newMaterial, QSGMaterial *oldMaterial)
{
Q_UNUSED(oldMaterial);
Q_ASSERT(program()->isLinked());
Material* m = static_cast<Material*>(newMaterial);
program()->setUniformValue(m_id_matrix, state.combinedMatrix()*m->transformation);
if (state.isOpacityDirty()) {
program()->setUniformValue(m_id_opacity, state.opacity());
}
program()->setUniformValue(m_id_color, m->color);
m_glFuncs->glBlendFunc(GL_ONE, GL_ONE);
m_glFuncs->glEnable(GL_POINT_SPRITE);
// glPointSize(m->pointSize); // Commenting this out since it is not available in QOpenGLFunctions (OpenGL ES 2.0) and apparently does not affect the point size
}
void QtViewRenderer::render()
{
QOpenGLFunctions* f = QOpenGLContext::currentContext()->functions();
OpenGLStateSaver state(f);
f->glEnable(GL_BLEND);
f->glBlendEquation(GL_FUNC_ADD);
f->glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
f->glDisable(GL_CULL_FACE);
f->glDisable(GL_DEPTH_TEST);
f->glActiveTexture(GL_TEXTURE0);
glClearColor(m_clearColor[0], m_clearColor[1], m_clearColor[2], 1.0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glViewport(0, 0, m_width, m_height);
QMatrix4x4 ortho;
ortho.ortho(m_viewBounds[0], m_viewBounds[2], m_viewBounds[3], m_viewBounds[1], -1, 1);
m_shader->bind();
m_shader->setUniformValue(m_locationTex, 0);
m_shader->setUniformValue(m_locationProjMtx, ortho);
m_VAO->bind();
int vboSize = 0, eboSize = 0;
for (const auto cmd_list : m_drawLists)
{
if (cmd_list->vtxBuffer().empty() || cmd_list->idxBuffer().empty())
continue;
const DrawList::DrawIdx* idx_buffer_offset = nullptr;
m_VBO->bind();
int vtxSize = cmd_list->vtxBuffer().size() * sizeof(DrawList::DrawVert);
if (vtxSize > vboSize)
{
m_VBO->allocate(vtxSize);
vboSize = vtxSize;
}
m_VBO->write(0, &cmd_list->vtxBuffer().front(), vtxSize);
m_EBO->bind();
int idxSize = cmd_list->idxBuffer().size() * sizeof(DrawList::DrawIdx);
if (idxSize > eboSize)
{
m_EBO->allocate(idxSize);
eboSize = idxSize;
}
m_EBO->write(0, &cmd_list->idxBuffer().front(), idxSize);
for (const auto& pcmd : cmd_list->cmdBuffer())
{
glBindTexture(GL_TEXTURE_2D, pcmd.textureId);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glDrawElements(GL_TRIANGLES, static_cast<GLsizei>(pcmd.elemCount), GL_UNSIGNED_INT, idx_buffer_offset);
idx_buffer_offset += pcmd.elemCount;
}
}
m_shader->release();
m_VAO->release();
}