Added framebuffer, surface height lookup

include/heightmap.hpp

@@ -4,6 +4,7 @@
 #include <glad/glad.h>
 #include <SDL.h>
 #include <colorscheme.hpp>
+#include <framebuffer.hpp>
 
 #include <string>
 #include <vector>
@@ -22,6 +23,9 @@ public:
 	virtual void upload() override;
 	virtual void unload() override;
 
+	//get deformation height in um at screen coordinate
+	float getSurfaceHeight(unsigned x, unsigned y, glm::mat4 projection, glm::mat4 view, glm::mat4 model);
+
 private:
 	//filename of origin
 	std::string _filename;
@@ -40,4 +44,5 @@ private:
 	float _scale;
 	GLuint _numElements;
 	std::shared_ptr<Colorscheme> _colorscheme_ptr;
+	std::shared_ptr<Framebuffer> _framebuffer_ptr;
 };
\ No newline at end of file

src/heightmap.cpp

@@ -57,6 +57,7 @@ Heightmap::Heightmap(std::string filename): _filename(filename) {
 		_minZ = min(_data, 2, 3);
 		_maxZ = max(_data, 2, 3);
 		_zRangeUm = (_maxZ - _minZ) / 10.; //in um
+		std::cout << "Identified z range: " << _zRangeUm << " um (" << _minZ << " - " << _maxZ << ")" << std::endl;
 		/*Throw if _zRange is less than 1 A (i.e. it's probably 0)*/
 		if (_zRangeUm < 1e-4) {
 			throw Nt1100_exception("Heightmap::Heightmap(std::string): z range is too close to zero (" + std::to_string(_zRangeUm) + ")");
@@ -71,8 +72,8 @@ Heightmap::Heightmap(std::string filename): _filename(filename) {
 			}
 		}
 		//recalculate _minZ, maxZ
-		_minZ = min(_data, 2, 3);
-		_maxZ = max(_data, 2, 3);
+		_minZ = min(_data, 2, 3); //should be 0
+		_maxZ = max(_data, 2, 3); //should be 1
 
 		/*Initialize Renderer Infrastructure*/
 		glGenBuffers(1, &_vbo);
@@ -150,6 +151,9 @@ Heightmap::Heightmap(std::string filename): _filename(filename) {
 		_shader_ptr->setFloat("bad_z_value", static_cast<float>(BAD_Z_VALUE));
 		_shader_ptr->setInt("colorscheme", 0);
 		_shader_ptr->unuse();
+
+		/*Setup Framebuffer*/
+		_framebuffer_ptr = std::make_shared<Framebuffer>();
 	}
 	else {
 		throw Nt1100_exception("Heightmap::Heightmap(std::string): File " + filename + " contents are empty.");
@@ -183,4 +187,25 @@ void Heightmap::unload() {
 
 bool Heightmap::is(const std::string filename) const {
 	return _filename == filename;
+}
+
+float Heightmap::getSurfaceHeight(unsigned x, unsigned y, glm::mat4 projection, glm::mat4 view, glm::mat4 model) {
+	_framebuffer_ptr->bind();
+
+	glClearColor(0.f, 0.f, 0.f, 1.0f);
+	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+	draw(projection, view, model);
+
+	auto color = _framebuffer_ptr->getPixel(x, y);
+	float defo_um = _colorscheme_ptr->color2value(color[0], color[1], color[2]);
+
+	_framebuffer_ptr->unbind();
+
+	if (defo_um != -1.) {
+		return defo_um * _zRangeUm;
+	}
+	else {
+		return -1.;
+	}
 }
\ No newline at end of file