void View3D::drawGrid() const
{
glEnable(GL_DEPTH_TEST);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
TransformState transState(Imath::V2i(width(), height()),
m_camera.projectionMatrix(),
m_camera.viewMatrix());
// Draw grid
if (m_gridShader->isValid())
{
QGLShaderProgram &gridShader = m_gridShader->shaderProgram();
// shader
gridShader.bind();
// vertex buffer
glBindVertexArray(m_gridVertexArray);
// matrix stack
transState.setUniforms(gridShader.programId());
// draw
glLineWidth(1); // this won't work anymore for values larger than 1 (2.0f);
glDrawArrays(GL_LINES, 0, (22 * 2));
// do NOT release shader, this is no longer supported in OpenGL 3.2
}
}
void execTransBackStatement(void)
{
SymTableNodePtr prevState = CurModule->getPrevState();
if(!prevState)
runtimeError(ABL_ERR_RUNTIME_NULL_PREVSTATE);
transState(prevState);
getCodeToken();
}
void execTransStatement(void)
{
getCodeToken();
getCodeToken();
SymTableNodePtr idPtr = getCodeSymTableNodePtr();
transState(idPtr);
getCodeToken();
}
void View3D::drawAxes() const
{
glDisable(GL_DEPTH_TEST);
TransformState projState(Imath::V2i(width(), height()),
Imath::M44d(),
Imath::M44d());
projState.projMatrix.makeIdentity();
projState.setOrthoProjection(0, width(), 0, height(), 0, 1);
projState.modelViewMatrix.makeIdentity();
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
const GLint w = 64; // Width of axes widget
const GLint o = 8; // Axes widget offset in x and y
// Center of axis overlay
const V3d center(o+w/2,o+w/2,0.0);
TransformState transState(Imath::V2i(width(), height()),
m_camera.projectionMatrix(),
m_camera.viewMatrix());
// Draw Background texture
if (m_axesBackgroundShader->isValid())
{
QGLShaderProgram& axesBackgroundShader = m_axesBackgroundShader->shaderProgram();
GLint textureSampler = glGetUniformLocation(axesBackgroundShader.programId(), "texture0");
// texture
m_drawAxesBackground.bind(textureSampler);
// shader
axesBackgroundShader.bind();
// vertex buffer
glBindVertexArray(m_quadVertexArray);
// matrix stack
projState.setUniforms(axesBackgroundShader.programId());
// draw
glDrawArrays( GL_TRIANGLES, 0, 6 );
// do NOT release shader, this is no longer supported in OpenGL 3.2
glBindVertexArray(0);
}
// Draw axes
if (m_axesShader->isValid())
{
//tfm::printfln("drawing with m_axesShader");
QGLShaderProgram& axesShader = m_axesShader->shaderProgram();
// shader
axesShader.bind();
// vertex buffer
glBindVertexArray(m_axesVertexArray);
// matrix stack
axesShader.setUniformValue("center", center.x, center.y, center.z);
projState.modelViewMatrix = m_camera.rotationMatrix();
projState.setUniforms(axesShader.programId());
// draw
glLineWidth(1); // this won't work anymore for values larger than 1 (4.0f);
glDrawArrays( GL_LINES, 0, 6 );
// do NOT release shader, this is no longer supported in OpenGL 3.2
}
// Draw Labels
const double r = 0.8; // 80% towards edge of circle
// TODO: check if we should do this again:
// Note that V3d -> V3i (double to integer precision)
// conversion is intentionally snapping the label to
// integer co-ordinates to eliminate subpixel aliasing
// artifacts. This is also the reason that matrix
// transformations are not being used for this.
const V3d px = V3d(1.0,0.0,0.0)*r*w/2;
const V3d py = V3d(0.0,1.0,0.0)*r*w/2;
const V3d pz = V3d(0.0,0.0,1.0)*r*w/2;
if (m_axesLabelShader->isValid())
{
QGLShaderProgram& axesLabelShader = m_axesLabelShader->shaderProgram();
GLint textureSampler = glGetUniformLocation(axesLabelShader.programId(), "texture0");
// shader
axesLabelShader.bind();
// vertex buffer
glBindVertexArray(m_quadLabelVertexArray);
// matrix stack
projState.setUniforms(axesLabelShader.programId());
// adjust positions
axesLabelShader.setUniformValue("center", center.x, center.y, center.z);
// offset
axesLabelShader.setUniformValue("offset", px.x, px.y, px.z);
// texture
m_drawAxesLabelX.bind(textureSampler);
// draw
glDrawArrays( GL_TRIANGLES, 0, 6 );
axesLabelShader.setUniformValue("offset", py.x, py.y, py.z);
// texture
m_drawAxesLabelY.bind(textureSampler);
// draw
glDrawArrays( GL_TRIANGLES, 0, 6 );
axesLabelShader.setUniformValue("offset", pz.x, pz.y, pz.z);
// texture
m_drawAxesLabelZ.bind(textureSampler);
// draw
glDrawArrays( GL_TRIANGLES, 0, 6 );
// do NOT release shader, this is no longer supported in OpenGL 3.2
}
}
void View3D::paintGL()
{
if (m_badOpenGL)
return;
QTime frameTimer;
frameTimer.start();
// Get window size
double dPR = getDevicePixelRatio();
int w = width() * dPR;
int h = height() * dPR;
// detecting a change in the device pixel ratio, since only the new QWindow (Qt5) would
// provide a signal for screen changes and this is the easiest solution
if (dPR != m_devicePixelRatio)
{
m_devicePixelRatio = dPR;
resizeGL(w, h);
}
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, m_incrementalFramebuffer);
//--------------------------------------------------
// Draw main scene
TransformState transState(Imath::V2i(w, h),
m_camera.projectionMatrix(),
m_camera.viewMatrix());
glClearDepth(1.0f);
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LEQUAL);
glClearColor(m_backgroundColor.redF(), m_backgroundColor.greenF(),
m_backgroundColor.blueF(), 1.0f);
if (!m_incrementalDraw)
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
std::vector<const Geometry*> geoms = selectedGeometry();
// Draw bounding boxes
if(m_drawBoundingBoxes && !m_incrementalDraw)
{
if (m_boundingBoxShader->isValid())
{
QGLShaderProgram &boundingBoxShader = m_boundingBoxShader->shaderProgram();
// shader
boundingBoxShader.bind();
// matrix stack
transState.setUniforms(boundingBoxShader.programId());
for (size_t i = 0; i < geoms.size(); ++i)
{
drawBoundingBox(transState, geoms[i]->getVAO("boundingbox"), geoms[i]->boundingBox().min,
Imath::C3f(1), geoms[i]->shaderId("boundingbox")); //boundingBoxShader.programId()
}
}
}
// Draw meshes and lines
if (!m_incrementalDraw)
{
drawMeshes(transState, geoms);
// Generic draw for any other geometry
// (TODO: make all geometries use this interface, or something similar)
// FIXME - Do generic quality scaling
const double quality = 1;
for (size_t i = 0; i < geoms.size(); ++i)
geoms[i]->draw(transState, quality);
}
// Aim for 40ms frame time - an ok tradeoff for desktop usage
const double targetMillisecs = 40;
double quality = m_drawCostModel.quality(targetMillisecs, geoms, transState,
m_incrementalDraw);
// Render points
DrawCount drawCount = drawPoints(transState, geoms, quality, m_incrementalDraw);
// Measure frame time to update estimate for how much geometry we can draw
// with a reasonable frame rate
glFinish();
int frameTime = frameTimer.elapsed();
if (!geoms.empty())
m_drawCostModel.addSample(drawCount, frameTime);
// Debug: print bar showing how well we're sticking to the frame time
// int barSize = 40;
// std::string s = std::string(barSize*frameTime/targetMillisecs, '=');
// if ((int)s.size() > barSize)
// s[barSize] = '|';
// tfm::printfln("%12f %4d %s", quality, frameTime, s);
// TODO: this should really render a texture onto a quad and not use glBlitFramebuffer
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
glBindFramebuffer(GL_READ_FRAMEBUFFER, m_incrementalFramebuffer);
glBlitFramebuffer(0,0,w,h, 0,0,w,h,
GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT, GL_NEAREST); // has to be GL_NEAREST to work with DEPTH
// Draw a grid for orientation purposes
if (m_drawGrid)
drawGrid();
// Draw overlay stuff, including cursor position.
if (m_drawCursor)
drawCursor(transState, m_cursorPos, 10);
//drawCursor(transState, m_camera.center(), 10);
// Draw overlay axes
if (m_drawAxes)
drawAxes();
// Set up timer to draw a high quality frame if necessary
if (!drawCount.moreToDraw)
m_incrementalFrameTimer->stop();
else
m_incrementalFrameTimer->start(10);
m_incrementalDraw = true;
glFrameBufferStatus(m_incrementalFramebuffer);
glCheckError();
}
