coordinate_cross::coordinate_cross(const gl::render_device_ptr& device,
const float line_length)
{
using namespace scm;
using namespace scm::gl;
using namespace scm::math;
using boost::assign::list_of;
size_t num_vertices = 6 * 2; // 6 lines, 2 vertices each
_vertices = device->create_buffer(BIND_VERTEX_BUFFER, USAGE_STREAM_DRAW, num_vertices * sizeof(vertex), 0);
render_context_ptr ctx = device->main_context();
{
vertex* data = static_cast<vertex*>(ctx->map_buffer(_vertices, ACCESS_WRITE_INVALIDATE_BUFFER));
if (data) {
float l = line_length;
int v = 0;
// pos x
data[v].pos = vec3f( 0.0f, 0.0f, 0.0f); data[v].col = vec3f(1.0f, 0.0f, 0.0f); ++v;
data[v].pos = vec3f( l, 0.0f, 0.0f); data[v].col = vec3f(1.0f, 0.0f, 0.0f); ++v;
// neg x
data[v].pos = vec3f( 0.0f, 0.0f, 0.0f); data[v].col = vec3f(0.3f, 0.0f, 0.0f); ++v;
data[v].pos = vec3f(-l, 0.0f, 0.0f); data[v].col = vec3f(0.3f, 0.0f, 0.0f); ++v;
// pos y
data[v].pos = vec3f(0.0f, 0.0f, 0.0f); data[v].col = vec3f(0.0f, 1.0f, 0.0f); ++v;
data[v].pos = vec3f(0.0f, l, 0.0f); data[v].col = vec3f(0.0f, 1.0f, 0.0f); ++v;
// neg y
data[v].pos = vec3f(0.0f, 0.0f, 0.0f); data[v].col = vec3f(0.0f, 0.3f, 0.0f); ++v;
data[v].pos = vec3f(0.0f, -l, 0.0f); data[v].col = vec3f(0.0f, 0.3f, 0.0f); ++v;
// pos z
data[v].pos = vec3f(0.0f, 0.0f, 0.0f); data[v].col = vec3f(0.0f, 0.0f, 1.0f); ++v;
data[v].pos = vec3f(0.0f, 0.0f, l); data[v].col = vec3f(0.0f, 0.0f, 1.0f); ++v;
// neg z
data[v].pos = vec3f(0.0f, 0.0f, 0.0f); data[v].col = vec3f(0.0f, 0.0f, 0.3f); ++v;
data[v].pos = vec3f(0.0f, 0.0f, -l); data[v].col = vec3f(0.0f, 0.0f, 0.3f); ++v;
}
else {
scm::err() << "coordinate_cross::coordinate_cross(): error mapping vertex buffer for vertex update." << log::end;
throw (std::runtime_error("coordinate_cross::coordinate_cross(): error mapping vertex buffer for vertex update."));
}
ctx->unmap_buffer(_vertices);
_vertex_count = 12;
_prim_topology = PRIMITIVE_LINE_LIST;
}
_coord_program = device->create_program(list_of(device->create_shader(STAGE_VERTEX_SHADER, wire_v_source))
(device->create_shader(STAGE_FRAGMENT_SHADER, wire_f_source)));
_vertex_array = device->create_vertex_array(vertex_format(0, 0, TYPE_VEC3F, sizeof(vertex)) // vertex positions
(0, 3, TYPE_VEC3F, sizeof(vertex)), // vertex colors
list_of(_vertices));
if ( !_coord_program) {
scm::err() << "coordinate_cross::coordinate_cross(): error creating shader programs." << log::end;
throw (std::runtime_error("coordinate_cross::coordinate_cross(): error creating shader programs."));
}
_no_blend = device->create_blend_state(false, FUNC_ONE, FUNC_ZERO, FUNC_ONE, FUNC_ZERO);
_dstate_less = device->create_depth_stencil_state(true, true, COMPARISON_LESS);
_dstate_overlay = device->create_depth_stencil_state(false, false, COMPARISON_LESS);
_raster_no_cull = device->create_rasterizer_state(FILL_SOLID, CULL_NONE, ORIENT_CCW, true);
if ( !_no_blend
|| !_dstate_less
|| !_raster_no_cull) {
scm::err() << "coordinate_cross::coordinate_cross(): error creating state objects." << log::end;
throw (std::runtime_error("coordinate_cross::coordinate_cross(): error creating state objects."));
}
}
