From 82293065b52f5a4e5c4ccde5eade4ebae18014ca Mon Sep 17 00:00:00 2001
From: Stijn Buys <ingar@osirion.org>
Date: Sat, 3 May 2008 21:04:02 +0000
Subject: liibmodel

---
 src/model/vertexarray.cc | 144 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 144 insertions(+)
 create mode 100644 src/model/vertexarray.cc

(limited to 'src/model/vertexarray.cc')

diff --git a/src/model/vertexarray.cc b/src/model/vertexarray.cc
new file mode 100644
index 0000000..420e816
--- /dev/null
+++ b/src/model/vertexarray.cc
@@ -0,0 +1,144 @@
+
+/*
+   model/vertexarray.cc
+   This file is part of the Osirion project and is distributed under
+   the terms of the GNU General Public License version 2
+*/
+
+#include "math/mathlib.h"
+#include "model/vertexarray.h"
+#include "sys/sys.h"
+
+namespace model {
+
+VertexArray *VertexArray::vertex_instance = 0 ;
+
+VertexArray::VertexArray(size_t size)
+{
+	vertex_instance = this;
+	vertex_size = size * 1024*1024;			// megabytes
+	vertex_size = vertex_size / sizeof(float);	// sizeof float
+	vertex_size = vertex_size / 4;			// 4 arrays
+	
+	vertex_vertex = (float *) malloc(vertex_size * sizeof(float));
+	vertex_color = (float *) malloc(vertex_size * sizeof(float));
+	vertex_normal = (float *) malloc(vertex_size * sizeof(float));
+	vertex_texture = (float *) malloc(vertex_size * sizeof(float));
+
+	con_print << "Initializing vertex array..." << std::endl;
+	con_debug << "  " << size << " Mb allocated" << std::endl;
+
+	clear();
+}
+
+VertexArray::~VertexArray()
+{
+	free(vertex_vertex);
+	free(vertex_normal);
+	free(vertex_color);
+	free(vertex_texture);
+	
+	vertex_instance = 0 ;
+}
+
+void VertexArray::clear()
+{
+	vertex_index = 0;
+
+	memset(vertex_vertex, 0, sizeof(vertex_vertex));
+	memset(vertex_color, 0, sizeof(vertex_color));
+	memset(vertex_normal, 0, sizeof(vertex_normal));
+	memset(vertex_texture, 0, sizeof(vertex_normal));
+
+	add_sphere();
+}
+
+void VertexArray::add_sphere()
+{
+	// load sphere vertices into the VertexArray
+
+	// build sin/cos table
+	float  *sintable;
+	float  *costable;
+
+	sintable = new float[SPHERESEGMENTS];
+	costable = new float[SPHERESEGMENTS];
+	float d = 2 * M_PI / (SPHERESEGMENTS-1);
+
+	for (int i=0; i < SPHERESEGMENTS; i++) {
+		sintable[i] = sin( d * (float) i );
+		costable[i] = cos ( d * (float) i );
+	}
+
+	// draw body
+	math::Color white(1.0f, 1.0f, 1.0f);
+	math::Vector3f v;
+	math::Vector3f n;
+
+	int count;
+
+	for (int j=0; j < SPHERESEGMENTS-1; j++) {
+		float r = sintable[j];
+		float r1 = sintable[j+1];
+
+		// glBegin
+		v = math::Vector3f(r, 0, costable[j]);
+		n = v;
+		n.normalize();
+		//normal(n);
+		//vertex(v);
+		add_vertex(v, n, white);
+
+		v = math::Vector3f(r1, 0, costable[j+1]);
+		n = v;
+		n.normalize();
+		//normal(n);
+		//vertex(v);
+		add_vertex(v, n, white);
+
+		count =2;
+
+		for (int i = SPHERESEGMENTS-1; i >= 0; i--) {
+			v = math::Vector3f(r*costable[i], r*sintable[i], costable[j]);
+			n = v;
+			n.normalize();
+			//normal(n);
+			//vertex(v);
+			add_vertex(v, n, white);
+			
+			v = math::Vector3f(r1*costable[i], r1*sintable[i], costable[j+1]);
+			n = v;
+			n.normalize();
+			//normal(n);
+			//vertex(v);
+			add_vertex(v, n, white);
+			count +=2;
+		}
+		// glEnd
+		
+	}
+
+	delete[] sintable;
+	delete[] costable;
+}
+
+void VertexArray::add_vertex(math::Vector3f const &v, math::Vector3f const &n, math::Color const &color) {
+	if (vertex_index + 3 >= vertex_size) {
+		con_warn << "VertexArray overflow!" << std::endl;
+		return;
+	}
+
+	for (int i = 0; i < 3; i ++) {
+		vertex_vertex[vertex_index+i] = v[i];
+		vertex_normal[vertex_index+i] = n[i];
+	}
+
+	vertex_color[vertex_index] = color.r;
+	vertex_color[vertex_index+1] = color.g;
+	vertex_color[vertex_index+2] = color.b;
+
+	vertex_index += 3;
+}
+
+}
+
-- 
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