From 52307df6461880423169e4deecd2c3e2f54509bb Mon Sep 17 00:00:00 2001
From: Joursoir <chat@joursoir.net>
Date: Tue, 6 Apr 2021 09:08:45 +0000
Subject: objects: fix bugs, add form circle

---
 src/objects.cpp | 57 ++++++++++++++++++++++++++++++++++++++++++++++-----------
 src/objects.hpp |  1 +
 2 files changed, 47 insertions(+), 11 deletions(-)

diff --git a/src/objects.cpp b/src/objects.cpp
index 4400a2d..b1b24bb 100644
--- a/src/objects.cpp
+++ b/src/objects.cpp
@@ -11,14 +11,14 @@ using namespace glm;
 const int cube_num_v = 8;
 Vertex cube_vertices[cube_num_v] = {
 	// first 4 - up edge
-	{ vec3(-0.5f, -0.5f, -0.5f), vec2(0.0f, 0.0f) },
-	{ vec3(0.5f, -0.5f, -0.5f), vec2(0.0f, 0.0f) },
-	{ vec3(0.5f, 0.5f, -0.5f), vec2(0.0f, 0.0f) },
-	{ vec3(-0.5f, 0.5f, -0.5f), vec2(0.0f, 0.0f) },
-	{ vec3(0.5f, 0.5f, 0.5f), vec2(0.0f, 0.0f) },
-	{ vec3(-0.5f, 0.5f, 0.5f), vec2(0.0f, 0.0f) },
-	{ vec3(-0.5f, -0.5f, 0.5f), vec2(0.0f, 0.0f) },
-	{ vec3(0.5f, -0.5f, 0.5f), 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) },
+	{ vec3(1.0f, -1.0f, 1.0f), vec2(0.0f, 0.0f) }
 };
 
 const int cube_num_i = 12 * 3;
@@ -33,13 +33,13 @@ GLuint cube_indices[cube_num_i] = {
 	0, 1, 7,
 	1, 4, 7, // right edge
 	1, 2, 4,
-	4, 5, 7, // down edge
+	4, 5, 6, // down edge
 	4, 6, 7
 };
 
 Mesh *form_cube()
 {
-	return new Mesh(cube_vertices, cube_num_v, cube_indices, cube_num_i);
+	return new Mesh(GL_TRIANGLES, cube_vertices, cube_num_v, cube_indices, cube_num_i);
 }
 
 Mesh *form_sphere(int longitude_count, int latitude_count)
@@ -114,10 +114,45 @@ Mesh *form_sphere(int longitude_count, int latitude_count)
 		}
 	}
 
-	Mesh *sphere = new Mesh(sphere_vertices, sphere_num_v,
+	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 / 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
diff --git a/src/objects.hpp b/src/objects.hpp
index 74ba884..3d816b9 100644
--- a/src/objects.hpp
+++ b/src/objects.hpp
@@ -5,5 +5,6 @@ class Mesh;
 
 Mesh *form_cube();
 Mesh *form_sphere(int longitude_count, int latitude_count);
+Mesh *form_circle(int angle_count);
 
 #endif /* ENGINE_OBJECTS_H */
-- 
cgit v1.2.3-18-g5258