thomastraum · October 9, 2012 22:50 · Sep 20, 2012
diff --git a/GrassBranch.h b/GrassBranch.h
@@ -0,0 +1,58 @@
+#ifndef APOLLO_GRASSBRANCH
+#define APOLLO_GRASSBRANCH
+
+#include <roxlu/Roxlu.h>
+#include <vector>
+
+class GrassBranch {
+public:
+	GrassBranch(VerticesPT& vertices);
+	~GrassBranch();
+	void setup(int numSegments, Vec2 position, Vec2 direction, float w, int id);
+	void update();
+	void draw();
+	void debugDraw();
+
+	// bunch of setter/getters
+	void setTextures(GLuint a, GLuint b);
+	GLuint getTex1();
+	GLuint getTex2();
+	size_t getStartIndex();
+	size_t getNumVertices();
+private:
+	std::vector<Vec2> texcoords;
+	VerticesPT& vertices;
+	std::vector<Vec2> points;
+	Vec2 direction;
+	Vec2 position;
+	float width;
+	size_t start_dx;
+	size_t end_dx;
+	size_t num_vertices;
+	bool calculated_texcoords;
+	int id; // used for randomness
+	GLuint tex1;
+	GLuint tex2;
+};
+
+inline void GrassBranch::setTextures(GLuint a, GLuint b) {
+	tex1 = a;
+	tex2 = b;
+}
+
+inline GLuint GrassBranch::getTex1() {
+	return tex1;
+}
+
+inline GLuint GrassBranch::getTex2() {
+	return tex2;
+}
+
+inline size_t GrassBranch::getStartIndex() {
+	return start_dx;
+}
+
+inline size_t GrassBranch::getNumVertices() {
+	return num_vertices;
+}
+#endif
diff --git a/gistfile1.md b/gistfile1.md
@@ -0,0 +1 @@
+<img src="http://upload.roxlu.com/server/php/files/Screen%20shot%202012-09-20%20at%202.37.01%20PM.png">
diff --git a/grassbranch.cpp b/grassbranch.cpp
@@ -0,0 +1,131 @@
+#include "GrassBranch.h"
+
+GrassBranch::GrassBranch(VerticesPT& vertices) 
+	:vertices(vertices)
+	,width(40.0f)
+	,start_dx(0)
+	,end_dx(0)
+	,num_vertices(0)
+	,calculated_texcoords(false)
+	,id(0)
+	,tex1(0)
+	,tex2(0)
+{
+}
+
+GrassBranch::~GrassBranch() {
+}
+
+void GrassBranch::setup(int numSegments, Vec2 position, Vec2 direction, float w, int id) {
+	this->id = id;
+	this->direction = direction;
+	this->position = position;
+	this->width = w;
+
+	Vec2 p = position;
+	for(int i = 0; i < numSegments; ++i)  {
+		p += direction;
+		points.push_back(p);
+	}
+}
+
+void GrassBranch::update() {
+	// kinematic
+	if(points.size() < 4) {
+		return;
+	}
+	start_dx = vertices.size();
+
+	Vec2 d;
+	points[0] = position;
+	points[1] = position;
+	points[1].x += ofSignedNoise(id*0.1, ofGetElapsedTimeMillis() * 0.001) * -1.0f;
+	for(int i = 2; i < points.size(); ++i) {
+		d = points[i] - points[i-2];
+		d.normalize();
+		points[i] = points[i-1] + d * 80;
+	}
+
+	// Create triangle strip
+	Vec2 a,b,perp;
+	VertexPT vert;
+	float w = width;
+	float tex_w = 1024; 
+	float tex_h = 768;
+
+	for(int i = 1, j = 0; i < points.size()-1; ++i, ++j) {
+		a = points[i];
+		b = points[i+1];
+		d = b - a;
+		d.normalize();
+		perp.x = -d.y;
+		perp.y = d.x;
+		perp *= w;
+
+		// right vertex
+		float t =  (i-1.0f)/(points.size()-2);
+
+		a = points[i] + perp;
+		vert.setPos(a.x, a.y, 0.0f);
+		if(calculated_texcoords) {
+			vert.setTex(texcoords[j * 2]);
+		}
+		else {
+			vert.setTex(a.x / tex_w, a.y / tex_h);
+			texcoords.push_back(Vec2(a.x / tex_w, a.y / tex_h));
+		}
+		vertices.add(vert);
+
+		// left vertex
+		a = points[i] - perp;
+		vert.setPos(a.x, a.y, 0.0f);
+		if(calculated_texcoords) {
+			vert.setTex(texcoords[(j*2)+1]);
+		}
+		else {
+			vert.setTex(a.x / tex_w, a.y / tex_h);
+			texcoords.push_back(Vec2(a.x / tex_w, a.y / tex_h));
+		}
+		vertices.add(vert);
+		w *= 0.9f;
+	}
+	end_dx = vertices.size();
+	num_vertices = end_dx - start_dx;
+	calculated_texcoords = true;
+}
+
+void GrassBranch::draw() {
+}
+
+void GrassBranch::debugDraw() {
+	// line trough the "root"
+	glColor3f(1.0f, 1.0f, 0.0f);
+	glBegin(GL_LINE_STRIP);
+	for(int i = 0; i < points.size(); ++i) {
+		glVertex2fv(points[i].getPtr());
+	}
+	glEnd();
+
+	// points of the "root"
+	glColor3f(1.0f, 0.0f, 0.0f);
+	glPointSize(5.0f);
+	glBegin(GL_POINTS);
+	for(int i = 0; i < points.size(); ++i) {
+		glVertex2fv(points[i].getPtr());
+	}
+	glEnd();
+
+	// triangle strip
+	glEnable(GL_TEXTURE_2D); glBindTexture(GL_TEXTURE_2D, tex1);
+	glColor3f(0.0f, 1.0f, 1.0f);
+	glBegin(GL_TRIANGLE_STRIP);
+	for(int i = start_dx; i < end_dx; ++i) {
+		glTexCoord2fv(vertices[i].tex.getPtr());
+		glVertex2fv(vertices[i].pos.getPtr());
+		VertexPT pt = vertices[i];
+	}
+	glEnd();
+	glPointSize(1.0f);
+	glColor3f(1.0f, 1.0f, 1.0f);
+	glBindTexture(GL_TEXTURE_2D, 0);
+}
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		<img src="http://upload.roxlu.com/server/php/files/Screen%20shot%202012-09-20%20at%202.37.01%20PM.png">
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