BoidRenderer::BoidRenderer(const BoidSystem& bs_,
std::string vshader_fname,
std::string fshader_fname,
int width,
int height)
: bs(bs_),
fov_angle_deg(60.0f),
near_plane(0.0625f),
far_plane(1024.0f),
vertex_shader_fname(vshader_fname),
fragment_shader_fname(fshader_fname)
{
update_projection_matrix((float)width/height);
// vertex buffer
GLuint vb;
glGenBuffers(1, &vb);
vertex_buffer = vb;
glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer);
glBufferData(GL_ARRAY_BUFFER,
bs.size()*3*sizeof(GL_FLOAT),
NULL, GL_DYNAMIC_DRAW);
if (!vertex_buffer)
throw std::runtime_error("failed to create vertex_buffer");
vertex_shader = make_shader(
GL_VERTEX_SHADER, vertex_shader_fname.c_str());
if (!vertex_shader)
throw std::runtime_error("failed to create vertex_shader");
fragment_shader = make_shader(
GL_FRAGMENT_SHADER,
fragment_shader_fname.c_str());
if (!fragment_shader)
throw std::runtime_error("failed to create fragment_shader");
program = make_program(
vertex_shader, fragment_shader);
if (!program)
throw std::runtime_error("failed to compile shader program");
attributes.position = glGetAttribLocation(
program, "position");
if (attributes.position == -1)
throw std::runtime_error("failed to find 'position' attribute in shader program");
uniforms.pmatrix = glGetUniformLocation(
program, "pmatrix");
if (uniforms.pmatrix == -1)
throw std::runtime_error("failed to find 'pmatrix' uniform in shader program");
uniforms.mvmatrix = glGetUniformLocation(
program, "mvmatrix");
if (uniforms.mvmatrix == -1)
throw std::runtime_error("failed to find 'mvmatrix' uniform in shader program");
}
void camera::update_view_projection_matrix() const {
if (projection_dirty || view_dirty) {
if (projection_dirty) {
update_projection_matrix();
}
if (view_dirty) {
update_view_matrix();
}
view_projection = projection * view;
}
}
