X-Git-Url: http://git.mutantstargoat.com?p=demo;a=blobdiff_plain;f=src%2Fopengl%2Fmesh-gl.cc;h=f0956b4470295a593c9b6feef30ed3d7b3a2f8fd;hp=4707f1168514ff8ae7d8c464428bc1be33468475;hb=243eb502c5dc70e586a9e81815234069bf623480;hpb=197f20b5d4db937029f7b585be23ee7fe5da66dc

diff --git a/src/opengl/mesh-gl.cc b/src/opengl/mesh-gl.cc
index 4707f11..f0956b4 100644
--- a/src/opengl/mesh-gl.cc
+++ b/src/opengl/mesh-gl.cc
@@ -15,6 +15,9 @@ MeshGL::MeshGL()
 
 	num_vertices = 0;
 	num_indices = 0;
+
+	/* draw normals */
+	nvao = nvbo = 0;
 }
 
 MeshGL::MeshGL(const MeshGL &mesh)
@@ -30,6 +33,9 @@ MeshGL::MeshGL(const MeshGL &mesh)
 	ibo = 0;
 	vao = 0;
 
+	/* draw normals */
+	nvao = nvbo = 0;
+
 	/*
 	 * if we set these to the actual
 	 * vertices.size() and indices.size()
@@ -76,6 +82,36 @@ void MeshGL::draw() const
 	glBindVertexArray(0);
 }
 
+void MeshGL::draw_normals(float scale) const
+{
+	if(!nvao) {
+		glGenVertexArrays(1, &nvao);
+		glBindVertexArray(nvao);
+
+		glGenBuffers(1, &nvbo);
+		glBindBuffer(GL_ARRAY_BUFFER, nvbo);
+		
+		glBufferData(GL_ARRAY_BUFFER, normals.size() * sizeof(Vec3) * 2, 0, GL_STATIC_DRAW);
+		Vec3 *data = (Vec3 *)glMapBuffer(GL_ARRAY_BUFFER, GL_WRITE_ONLY);
+
+		for (size_t i = 0; i < normals.size(); i++)
+		{
+			*data++ = vertices[i];
+			*data++ = vertices[i] + normals[i] * scale;
+		}
+		glUnmapBuffer(GL_ARRAY_BUFFER);
+
+		glVertexAttribPointer(MESH_VERTEX, 3, GL_FLOAT, GL_FALSE, sizeof(Vec3), 0);
+		glEnableVertexAttribArray(MESH_VERTEX);
+		glBindBuffer(GL_ARRAY_BUFFER, 0);
+	} else {
+		glBindVertexArray(nvao);
+	}
+
+	glDrawArrays(GL_LINES, 0, normals.size() * 2);
+	glBindVertexArray(0);
+}
+
 void MeshGL::update_vertex_data()
 {
 	update_vbo();
@@ -164,6 +200,12 @@ void MeshGL::destroy_vbo()
 	if(vbo_tex_coords)
 		glDeleteBuffers(1, &vbo_tex_coords);
 	if(ibo)
-		if(vao)
-			glDeleteVertexArrays(1, &vao);
+		glDeleteBuffers(1, &ibo);
+	if (vao)
+		glDeleteVertexArrays(1, &vao);
+
+	if(nvbo)
+		glDeleteBuffers(1, &nvbo);
+	if(nvao)
+		glDeleteVertexArrays(1, &nvao);
 }
\ No newline at end of file