void OGLViewer::initializeGL()
{
// OpenGL extention initialization
glewInit();
// Print OpenGL vertion
cout << "Renderer: " << glGetString(GL_RENDERER) << endl;
cout << "OpenGL version supported " << glGetString(GL_VERSION) << endl;
// Enable OpenGL features
glEnable(GL_MULTISAMPLE);
//glEnable(GL_LINE_SMOOTH);
//glEnable(GL_POLYGON_SMOOTH);
glEnable(GL_BLEND);
glEnable(GL_DEPTH_TEST); // enable depth-testing
glBlendEquation(GL_FUNC_ADD);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glFrontFace(GL_CCW); // set counter-clock-wise vertex order to mean the front
glClearColor(0.6, 0.6, 0.6, 0.0);
//////////////////////////////////////////////////////////////////////////
// Create shader files
model_shader.reset(new GLSLProgram("mesh_vs.glsl", "mesh_fs.glsl",
nullptr, nullptr, nullptr, true, 1, feedbackVaryings.data()));
// Export vbo for shaders
model_mesh->exportVBO(&model_verts, &model_uvs, &model_norms);
feedbackOutput.resize(model_verts.size());
bindMesh();
}
Mesh::Mesh():
FACES(0),
TRIANGLES_PER_FACE(0),
VERTICES_PER_TRIANGLE(0),
INDICES(0),
INDEX_ARRAY_SIZE(0),
DIMENSIONS(0),
COLOUR_COMPONENT_COUNT(0),
VERTEX_SIZE(0),
VERTEX_COUNT(0),
VERTEX_ARRAY_SIZE(0),
name(""),
indexedMesh(true),
wireFrame(false),
meshHandle(0)
{
glGenVertexArrays(1, &meshHandle);
bindMesh();
}
void Mesh::draw()
{
bindMesh();
//Let openGL know that our input is triangles to be tesselated.
glPatchParameteri(GL_PATCH_VERTICES, 3);
if (indexedMesh)
{
/* Draw whatever is specified by the currently bound mesh (VAO)
* 1. Type of primitive we want to draw
* 2. Amount of indices in our array
* 3. Type of variable stored in the array
* 4. Pointer to the actual index array (leave as null to get the bound GL_ELEMENT_ARRAY_BUFFER instead)
*/
glDrawElements(GL_PATCHES, INDEX_ARRAY_SIZE, GL_UNSIGNED_INT, 0);
}
else
{
glDrawArrays(GL_TRIANGLES, 0, VERTEX_COUNT);
}
}
