From 94c77b14469c9122d945eb1cf337507ff74c2fb6 Mon Sep 17 00:00:00 2001
From: Jon Bergli Heier <snakebite@jvnv.net>
Date: Sat, 2 Apr 2011 18:00:55 +0200
Subject: Moved select() into Scene, fixed rendering end of terrain.

---
 scene.cpp | 45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

(limited to 'scene.cpp')

diff --git a/scene.cpp b/scene.cpp
index 47b76bf..c477345 100644
--- a/scene.cpp
+++ b/scene.cpp
@@ -1,11 +1,32 @@
 #include "scene.h"
 
+#include <SDL_image.h>
 #include <SDL_opengl.h>
 
 #include <cmath>
 
 #define inrange(a, b, c) ((a) >= (b) && (a) <= (c))
 
+Scene::Scene() {
+	SDL_Surface *hm = IMG_Load("heightmap10.png");
+	float *heightmap = new float[hm->w * hm->h];
+	for(int x = 0; x < hm->w; x++) {
+		for(int y = 0; y < hm->h; y++) {
+			Uint8 *p = (Uint8*)hm->pixels + y * hm->pitch + x * hm->format->BytesPerPixel;
+			heightmap[y*hm->w + x] = ((float)(*p) / 256) * 20;
+		}
+	}
+	int w = hm->w;
+	int h = hm->h;
+	SDL_FreeSurface(hm);
+	qt = new Quadtree(w, h, heightmap, 3);
+}
+
+Scene::~Scene() {
+	if(qt)
+		delete qt;
+}
+
 void Scene::lookat() {
 	/* calculate cartesian coordinates for the center vector where yaw is Φ and pitch is θ
 	 * x = cos Φ sin θ
@@ -44,3 +65,27 @@ void Scene::move(float forward, float right, int steps) {
 	//pos.x += dir.x;
 	//pos.z += dir.y;
 }
+
+bool Scene::select(int x, int y, float& px, float& py, float& pz) {
+	GLint view[4] = {0};
+	GLdouble mvmatrix[16] = {0}, projmatrix[16] = {0};
+	glGetDoublev(GL_PROJECTION_MATRIX, projmatrix);
+	glGetDoublev(GL_MODELVIEW_MATRIX, mvmatrix);
+	glGetIntegerv(GL_VIEWPORT, view);
+
+	y = view[3] - y - 1;
+
+	float z;
+	glReadBuffer(GL_BACK);
+	glReadPixels(x, y, 1, 1, GL_DEPTH_COMPONENT, GL_FLOAT, &z);
+
+	GLdouble _px, _py, _pz;
+	if(gluUnProject(x, y, z, mvmatrix, projmatrix, view, &_px, &_py, &_pz) == GLU_TRUE) {
+		px = _px;
+		py = _py;
+		pz = _pz;
+		return true;
+	}
+
+	return false;
+}
-- 
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