line_renderer.cxx

#include "line_renderer.h"
#include <cgv_reflect_types/media/color.h>
#include <cgv_gl/gl/gl.h>
#include <cgv_gl/gl/gl_tools.h>
 
namespace cgv {
    namespace render {
        
        line_renderer& ref_line_renderer(context& ctx, int ref_count_change)
        {
            static int ref_count = 0;
            static line_renderer r;
            r.manage_singleton(ctx, "line_renderer", ref_count, ref_count_change);
            return r;
        }
        void line_renderer::enable_attribute_array_manager(const context& ctx, attribute_array_manager& aam)
        {
            group_renderer::enable_attribute_array_manager(ctx, aam);
            if (has_attribute(ctx, "normal"))
                has_normals = true;
            if (has_attribute(ctx, "line_width"))
                has_line_widths = true;
            if (has_attribute(ctx, "depth_offset"))
                has_depth_offsets = true;
        }
        void line_renderer::disable_attribute_array_manager(const context& ctx, attribute_array_manager& aam)
        {
            group_renderer::disable_attribute_array_manager(ctx, aam);
            has_normals = false;
            has_line_widths = false;
            has_depth_offsets = false;
        }
        void line_renderer::remove_normal_array(const context& ctx) {
            has_normals = false;
            remove_attribute_array(ctx, "normal");
        }
        void line_renderer::remove_line_width_array(const context& ctx) {
            has_line_widths = false;
            remove_attribute_array(ctx, "line_width");
        }
        void line_renderer::remove_depth_offset_array(const context& ctx) {
            has_depth_offsets = false;
            remove_attribute_array(ctx, "depth_offset");
        }
        bool line_renderer::init(context& ctx)
        {
            bool res = renderer::init(ctx);
            // FIXME: Normally we could use the shader_program::set_attribute(const context& ctx, const std::string& name, const T& value) overload
            // to write this more cleanly but this will print an error if the attribute is not found. Under normal circumstances this would never happen,
            // but some derived classes like the box_wire_renderer and the normal renderer do not use all the lne_renderere attributes and so the error
            // would appear.
            int li;
            li = get_prog_attribute_location(ctx, "normal", false);
            if(li != -1)
                ref_prog().set_attribute(ctx, li, vec3(0.0f, 0.0f, 1.0f));
            li = get_prog_attribute_location(ctx, "depth_offset", false);
            if(li != -1)
                ref_prog().set_attribute(ctx, li, 0.0f);
            li = get_prog_attribute_location(ctx, "line_width", false);
            if(li != -1)
                ref_prog().set_attribute(ctx, li, 1.0f);
            return res;
        }
 
        bool line_renderer::enable(context& ctx)
        {
            const line_render_style& lrs = get_style<line_render_style>();
            if (!group_renderer::enable(ctx))
                return false;
            // set program attributes
            if (!has_colors)
                ctx.set_color(lrs.default_color);
            if(!has_normals) {
                int li = get_prog_attribute_location(ctx, "normal", false);
                if(li != -1)
                    ref_prog().set_attribute(ctx, li, lrs.default_normal);
            }
            if(!has_depth_offsets) {
                int li = get_prog_attribute_location(ctx, "depth_offset", false);
                if(li != -1)
                    ref_prog().set_attribute(ctx, li, lrs.default_depth_offset);
            }
            if(!has_line_widths) {
                int li = get_prog_attribute_location(ctx, "line_width", false);
                if(li != -1)
                    ref_prog().set_attribute(ctx, li, lrs.default_line_width);
            }
            // configure blend state
            if (lrs.blend_lines) {
                ctx.push_blend_state();
                ctx.get_blend_state();
                ctx.enable_blending();
                ctx.set_blend_func(BF_SRC_ALPHA, BF_ONE_MINUS_SRC_ALPHA);
            }
 
            // set program uniforms
            ref_prog().set_uniform(ctx, "halo_color", lrs.halo_color);
            ref_prog().set_uniform(ctx, "halo_width_in_pixel", lrs.halo_width_in_pixel);
            ref_prog().set_uniform(ctx, "percentual_halo_width", 0.01f * lrs.percentual_halo_width);
            ref_prog().set_uniform(ctx, "screen_aligned", lrs.screen_aligned);
            ref_prog().set_uniform(ctx, "measure_line_width_in_pixel", lrs.measure_line_width_in_pixel);
            ref_prog().set_uniform(ctx, "reference_line_width", lrs.reference_line_width);
            ref_prog().set_uniform(ctx, "blend_width_in_pixel", lrs.blend_width_in_pixel);
            ref_prog().set_uniform(ctx, "viewport_height", (float)ctx.get_height());
            ref_prog().set_uniform(ctx, "halo_color_strength", lrs.halo_color_strength);
            return true;
        }
 
        bool line_renderer::disable(context& ctx)
        {
            if (!attributes_persist()) {
                has_normals = false;
                has_line_widths = false;
                has_depth_offsets = false;
            }
            const line_render_style& lrs = get_style<line_render_style>();
            if (lrs.blend_lines)
                ctx.pop_blend_state();
            return group_renderer::disable(ctx);
        }
 
        void line_renderer::draw(context& ctx, size_t start, size_t count, bool use_strips, bool use_adjacency, uint32_t strip_restart_index)
        {   
            draw_impl(ctx, use_strips ? (use_adjacency ? PT_LINE_STRIP_ADJACENCY : PT_LINE_STRIP) : (use_adjacency ? PT_LINES_ADJACENCY : PT_LINES), start, count, use_strips, use_adjacency, strip_restart_index);
        }
 
        bool line_render_style_reflect::self_reflect(cgv::reflect::reflection_handler& rh)
        {
            return
                rh.reflect_base(*static_cast<cgv::render::group_render_style*>(this)) &&
                rh.reflect_member("default_normal", default_normal) &&
                rh.reflect_member("default_color", default_color) &&
                rh.reflect_member("default_line_width", default_line_width) &&
                rh.reflect_member("default_depth_offset", default_depth_offset) &&
                rh.reflect_member("blend_lines", blend_lines) &&
                rh.reflect_member("halo_color", halo_color) &&
                rh.reflect_member("halo_width_in_pixel", halo_width_in_pixel) &&
                rh.reflect_member("percentual_halo_width", percentual_halo_width) &&
                rh.reflect_member("screen_aligned", screen_aligned) &&
                rh.reflect_member("measure_line_width_in_pixel", measure_line_width_in_pixel) &&
                rh.reflect_member("reference_line_width", reference_line_width) &&
                rh.reflect_member("blend_width_in_pixel", blend_width_in_pixel) &&
                rh.reflect_member("halo_color_strength", halo_color_strength);
        }
 
        cgv::reflect::extern_reflection_traits<line_render_style, line_render_style_reflect> get_reflection_traits(const line_render_style&)
        {
            return cgv::reflect::extern_reflection_traits<line_render_style, line_render_style_reflect>();
        }
    }
}
 
#include <cgv/gui/provider.h>
 
namespace cgv {
    namespace gui {
 
        struct line_render_style_gui_creator : public gui_creator
        {
            bool create(provider* p, const std::string& label,
                void* value_ptr, const std::string& value_type,
                const std::string& gui_type, const std::string& options, bool*)
            {
                if (value_type != cgv::type::info::type_name<cgv::render::line_render_style>::get_name())
                    return false;
                cgv::render::line_render_style* lrs_ptr = reinterpret_cast<cgv::render::line_render_style*>(value_ptr);
                cgv::base::base* b = dynamic_cast<cgv::base::base*>(p);
                p->add_gui("Default Normal", lrs_ptr->default_normal, "direction", "options='min=-1;max=1;ticks=true'");
                p->add_member_control(b, "Default Color", lrs_ptr->default_color);
                p->add_member_control(b, "Screen Aligned", lrs_ptr->screen_aligned, "toggle");
                p->add_member_control(b, "Default Line Width", lrs_ptr->default_line_width, "value_slider", "min=1;max=20;log=true;ticks=true;w=130", "");
                p->add_member_control(b, "px", lrs_ptr->measure_line_width_in_pixel, "toggle", "w=16", "");
                p->add_member_control(b, "Blend", lrs_ptr->blend_lines, "toggle", "w=50");              
                p->add_member_control(b, "Reference Line Width", lrs_ptr->reference_line_width, "value_slider", "min=0.0000001;max=1;step=0.00000001;log=true;ticks=true");
                p->add_member_control(b, "Default Depth Offset", lrs_ptr->default_depth_offset, "value_slider", "min=-0.001;max=0.001;step=0.00000001;log=true;ticks=true");
                bool show = p->begin_tree_node("Halo", lrs_ptr->halo_color, false, "options='w=120';level=3;align=''");
                p->add_member_control(b, "Color", lrs_ptr->halo_color, "", "w=50");
                if (show) {
                    p->align("\a");
                    p->add_member_control(b, "Halo Color Strength", lrs_ptr->halo_color_strength, "value_slider", "min=0;max=1;ticks=true");
                    p->add_member_control(b, "Halo Width in Pixel", lrs_ptr->halo_width_in_pixel, "value_slider", "min=-10;max=10;ticks=true");
                    p->add_member_control(b, "Percentual Halo Width", lrs_ptr->percentual_halo_width, "value_slider", "min=-100;max=100;ticks=true");
                    p->add_member_control(b, "Blend Width in Pixel", lrs_ptr->blend_width_in_pixel, "value_slider", "min=0;max=3;ticks=true");
                    p->align("\b");
                    p->end_tree_node(lrs_ptr->halo_color);
                }
                if (p->begin_tree_node("Use of Group Information", lrs_ptr->use_group_color, false, "level=3")) {
                    p->align("\a");
                    p->add_gui("group render style", *static_cast<cgv::render::group_render_style*>(lrs_ptr));
                    p->align("\b");
                    p->end_tree_node(lrs_ptr->use_group_color);
                }
                return true;
            }
        };
 
#include "gl/lib_begin.h"
 
CGV_API cgv::gui::gui_creator_registration<line_render_style_gui_creator> line_rs_gc_reg("line_render_style_gui_creator");
 
    }
}