Handle new uniforms (section line drawing on model)

src/heightmap.cpp

@@ -151,6 +151,12 @@ Heightmap::Heightmap(std::string filename): _filename(filename) {
 		_shader_ptr->setFloat("maxZ", static_cast<float>(_maxZ));
 		_shader_ptr->setFloat("bad_z_value", static_cast<float>(BAD_Z_VALUE));
 		_shader_ptr->setInt("colorscheme", 0);
+    _shader_ptr->setInt("plotLinesEnabled", 1);
+    _shader_ptr->setVec3("plotLineAlongX_color", glm::vec3(1.f,0.f,1.f));
+    _shader_ptr->setVec3("plotLineAlongY_color", glm::vec3(1.f,0.f,0.f));
+    _shader_ptr->setFloat("plotLineHalfThickness", 0.01f);
+    _shader_ptr->setFloat("plotLineAlongX_y", -99999.f);
+    _shader_ptr->setFloat("plotLineAlongY_x", -99999.f);
 		_shader_ptr->unuse();
 
 		/*Setup Framebuffer*/
@@ -206,8 +212,18 @@ float Heightmap::getSurfaceHeight(unsigned x, unsigned y, glm::mat4 projection,
 	glClearColor(0.f, 0.f, 0.f, 1.0f);
 	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
+  //temporarily disable plot lines for this drawcall
+  _shader_ptr->use();
+  _shader_ptr->setInt("plotLinesEnabled", 0);
+  _shader_ptr->unuse();
+
 	draw(projection, view, model);
 
+  //re-enable plot lines
+  _shader_ptr->use();
+  _shader_ptr->setInt("plotLinesEnabled", 1);
+  _shader_ptr->unuse();
+
 	auto color = _framebuffer_ptr->getPixel(x, y);
 	float defo_um = _colorscheme_ptr->color2value(color[0], color[1], color[2]);
 
@@ -225,6 +241,11 @@ void Heightmap::updatePlotWindow(){
 	ImGui::Begin("Height Profiles", nullptr);
 	ImGui::SliderFloat("Offset y", &_plotAlongX_y, _minY, _maxY, "%.3f mm");
 	ImGui::SliderFloat("Offset x", &_plotAlongY_x, _minX, _maxX, "%.3f mm");
+  //update uniforms accordingly
+  _shader_ptr->use();
+  _shader_ptr->setFloat("plotLineAlongX_y", _plotAlongX_y);
+  _shader_ptr->setFloat("plotLineAlongY_x", _plotAlongY_x);
+  _shader_ptr->unuse();
 	_plotHeightLineAlongX(_plotAlongX_y);
 	_plotHeightLineAlongY(_plotAlongY_x);
 	ImGui::End();