1 files changed, 157 insertions, 0 deletions
diff --git a/src/game/objects.cpp b/src/game/objects.cpp
new file mode 100644
index 0000000..b7dbf66
--- /dev/null
+++ b/src/game/objects.cpp
@@ -0,0 +1,157 @@
+#include <glm/glm.hpp>
+#include <glm/gtc/constants.hpp>
+
+#include "objects.hpp"
+#include "graphics/Mesh.hpp"
+#include "graphics/Vertex.hpp"
+
+using namespace glm;
+
+const int cube_num_v = 8;
+Vertex cube_vertices[cube_num_v] = {
+	// first 4 - up edge
+	{ vec3(-1.0f, -1.0f, -1.0f), vec2(0.0f, 0.0f) },
+	{ vec3(1.0f, -1.0f, -1.0f), vec2(0.0f, 0.0f) },
+	{ vec3(1.0f, 1.0f, -1.0f), vec2(0.0f, 0.0f) },
+	{ vec3(-1.0f, 1.0f, -1.0f), vec2(0.0f, 0.0f) },
+	{ vec3(1.0f, 1.0f, 1.0f), vec2(0.0f, 0.0f) },
+	{ vec3(-1.0f, 1.0f, 1.0f), vec2(0.0f, 0.0f) },
+	{ vec3(-1.0f, -1.0f, 1.0f), vec2(0.0f, 0.0f) },
+	{ vec3(1.0f, -1.0f, 1.0f), vec2(0.0f, 0.0f) }
+};
+
+const int cube_num_i = 12 * 3;
+GLuint cube_indices[cube_num_i] = {
+	0, 1, 2, // up edge
+ 	0, 2, 3,
+	2, 3, 4, // far edge
+	3, 4, 5,
+	0, 3, 5, // left edge
+	0, 5, 6,
+	0, 6, 7, // near edge
+	0, 1, 7,
+	1, 4, 7, // right edge
+	1, 2, 4,
+	4, 5, 6, // down edge
+	4, 6, 7
+};
+
+Mesh *form_cube()
+{
+	return new Mesh(GL_TRIANGLES, cube_vertices, cube_num_v, cube_indices, cube_num_i);
+}
+
+Mesh *form_sphere(int longitude_count, int latitude_count)
+{
+	/* The points on the sphere with radius r > 0 and center (x0, y0, z0)...
+		...can be parameterized via:
+	{
+		x = x0 + R * sin(tetta) * cos(phi)
+		y = y0 + R * sin(tetta) * sin(phi)
+		z = z0 + R * cos(tetta)
+		tetta : [0, PI];  phi : [0, 2PI]
+	}
+	or:
+	{
+		x = x0 + R * cos(phi) * cos(tetta)
+		y = y0 + R * cos(phi) * sin(tetta)
+		z = z0 + R * sin(phi)
+	}
+	our x0, y0, z0 = 0 */
+	int i, j, idx, k1, k2;
+	float x, y, z;
+	float s, t;
+	float radius = 1.0;
+
+	// sectors
+	float longitude_step = pi<float>() / longitude_count;
+	float longitude_angle;
+
+	// stacks
+	float latitude_step = 2 * pi<float>() / latitude_count;
+	float latitude_angle;
+
+	int sphere_num_v = (longitude_count + 1) * (latitude_count + 1);
+	Vertex *sphere_vertices = new Vertex[sphere_num_v];
+	for(i = 0, idx = 0; i <= longitude_count; i++) {
+		longitude_angle = i * longitude_step;
+		z = radius * cos(longitude_angle);
+
+		for(j = 0; j <= latitude_count; j++) {
+			latitude_angle = j * latitude_step;
+
+			x = radius * sinf(longitude_angle) * cosf(latitude_angle);
+			y = radius * sinf(longitude_angle) * sinf(latitude_angle);
+			sphere_vertices[idx].pos_coords = glm::vec3(x, y, z);
+
+			s = (float)j / longitude_count;
+			t = (float)i / latitude_count;
+			sphere_vertices[idx].tex_coords = glm::vec2(s, t);
+			idx++;
+		}
+	}
+
+	int sphere_num_i = (longitude_count - 1) * latitude_count * 6;
+	GLuint *sphere_indices = new GLuint[sphere_num_i];
+	for(i = 0, idx = 0; i < longitude_count; i++) {
+		k1 = i * (latitude_count+1);
+		k2 = k1 + (latitude_count+1);
+
+		for(j = 0; j < latitude_count; j++, k1++, k2++) {
+			if(i != 0)
+			{
+				sphere_indices[idx++] = k1;
+				sphere_indices[idx++] = k2;
+				sphere_indices[idx++] = k1 + 1;
+			}
+			if(i != (longitude_count-1))
+			{
+				sphere_indices[idx++] = k1 + 1;
+				sphere_indices[idx++] = k2;
+				sphere_indices[idx++] = k2 + 1;
+			}
+		}
+	}
+
+	Mesh *sphere = new Mesh(GL_TRIANGLES, sphere_vertices, sphere_num_v,
+		sphere_indices, sphere_num_i);
+
+	delete[] sphere_vertices;
+	delete[] sphere_indices;
+	return sphere;
+}
+
+Mesh *form_circle(int angle_count)
+{
+	int i, idx, idy;
+	float x, y, z;
+	float radius = 1.0f;
+	float angle_step = 2 * pi<float>() / angle_count;
+	float angle;
+
+	Vertex *circle_vertices = new Vertex[angle_count];
+	GLuint *circle_indices = new GLuint[angle_count * 2];
+	for(i = 0, idx = 0, idy = 0; i < angle_count; i++) {
+		angle = i * angle_step;
+		x = radius * cosf(angle);
+		y = 0;
+		z = radius * sinf(angle);
+		circle_vertices[idx].pos_coords = glm::vec3(x, y, z);
+		circle_vertices[idx].tex_coords = glm::vec2(0, 0);
+		idx++;
+
+		if(i != 0) {
+			circle_indices[idy++] = i-1;
+			circle_indices[idy++] = i;
+		}
+	}
+	circle_indices[idy++] = i-1;
+	circle_indices[idy] = 0;
+
+	Mesh *circle = new Mesh(GL_LINES, circle_vertices, angle_count,
+		circle_indices, angle_count * 2);
+
+	delete[] circle_vertices;
+	delete[] circle_indices;
+	return circle;
+}
+\ No newline at end of file