X-Git-Url: http://git.mutantstargoat.com?a=blobdiff_plain;f=src%2Fopengl%2Fmesh-gl.cc;h=531ac7888181513e6d7ff348ff4cf976590df53e;hb=d90ed8aef9e3547eee75ad793c352ee022d35050;hp=119d043b884e1969e4e2c3e9c0c031764a79fb80;hpb=63d7f3b0e70ab5e3d530c579b1881967c96b0b92;p=demo

diff --git a/src/opengl/mesh-gl.cc b/src/opengl/mesh-gl.cc
index 119d043..531ac78 100644
--- a/src/opengl/mesh-gl.cc
+++ b/src/opengl/mesh-gl.cc
@@ -1,4 +1,5 @@
 #include <GL/glew.h>
+#include <GL/gl.h>
 #include <gmath/gmath.h>
 
 #include "mesh-gl.h"
@@ -14,6 +15,9 @@ MeshGL::MeshGL()
 
 	num_vertices = 0;
 	num_indices = 0;
+
+	/* draw normals */
+	nvao = nvbo = 0;
 }
 
 MeshGL::MeshGL(const MeshGL &mesh)
@@ -29,6 +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()
@@ -62,10 +69,15 @@ MeshGL::~MeshGL()
 
 	vertices.clear();
 	normals.clear();
+	tex_coords.clear();
+	indices.clear();
 }
 
 void MeshGL::draw() const
 {
+	if(!vdata_valid) {
+		((MeshGL *)this)->update_vertex_data();
+	}
 	glBindVertexArray(vao);
 
 	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ibo);
@@ -75,9 +87,40 @@ void MeshGL::draw() const
 	glBindVertexArray(0);
 }
 
-void MeshGL::update_vertex_data()
+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);
+}
+
+bool MeshGL::update_vertex_data()
 {
 	update_vbo();
+	return true;
 }
 
 void MeshGL::update_vbo()
@@ -163,6 +206,12 @@ void MeshGL::destroy_vbo()
 	if(vbo_tex_coords)
 		glDeleteBuffers(1, &vbo_tex_coords);
 	if(ibo)
-		if(vao)
-			glDeleteVertexArrays(1, &vao);
-}
\ No newline at end of file
+		glDeleteBuffers(1, &ibo);
+	if(vao)
+		glDeleteVertexArrays(1, &vao);
+
+	if(nvbo)
+		glDeleteBuffers(1, &nvbo);
+	if(nvao)
+		glDeleteVertexArrays(1, &nvao);
+}