void MovingDots::drawFrame(shared_ptr<StimulusDisplay> display) {
//
// Update dots
//
currentTime = getElapsedTime();
if (previousTime != currentTime) {
updateParameters();
updateDots();
previousTime = currentTime;
if (currentNumDots > 0) {
gl::BufferBinding<GL_ARRAY_BUFFER> arrayBufferBinding(dotPositionBuffer);
glBufferData(GL_ARRAY_BUFFER,
dotPositions.size() * sizeof(decltype(dotPositions)::value_type),
dotPositions.data(),
GL_STREAM_DRAW);
}
}
if (0 == currentNumDots) {
// No dots, so nothing to draw
return;
}
//
// Draw the dots
//
gl::ProgramUsage programUsage(program);
gl::VertexArrayBinding vertexArrayBinding(vertexArray);
auto currentMVPMatrix = GLKMatrix4Translate(display->getProjectionMatrix(),
fieldCenterX->getValue().getFloat(),
fieldCenterY->getValue().getFloat(),
0.0);
currentMVPMatrix = GLKMatrix4Scale(currentMVPMatrix, currentFieldRadius, currentFieldRadius, 1.0);
currentMVPMatrix = GLKMatrix4Rotate(currentMVPMatrix,
GLKMathDegreesToRadians(direction->getValue().getFloat()),
0.0,
0.0,
1.0);
glUniformMatrix4fv(mvpMatrixUniformLocation, 1, GL_FALSE, currentMVPMatrix.m);
#if !MWORKS_OPENGL_ES
gl::Enabled<GL_PROGRAM_POINT_SIZE> pointSizeEnabled;
#endif
glUniform1f(pointSizeUniformLocation, dotSize->getValue().getFloat() * dotSizeToPixels);
auto currentColor = GLKVector4Make(red->getValue().getFloat(),
green->getValue().getFloat(),
blue->getValue().getFloat(),
alpha->getValue().getFloat());
glUniform4fv(colorUniformLocation, 1, currentColor.v);
gl::Enabled<GL_BLEND> blendEnabled;
glBlendEquation(GL_FUNC_ADD);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glDrawArrays(GL_POINTS, 0, currentNumDots);
}
void Camera::update_projection()
{
projectionMatrix_ = GLKMatrix4MakePerspective(GLKMathDegreesToRadians(fov_), aspectRatio_, near_, far_);
}