rewrite label_system

sources/enduro2d/high/systems/label_system.cpp

@@ -6,59 +6,352 @@
 
 #include <enduro2d/high/systems/label_system.hpp>
 
+#include <enduro2d/high/assets/font_asset.hpp>
+#include <enduro2d/high/assets/texture_asset.hpp>
+
 #include <enduro2d/high/components/label.hpp>
 #include <enduro2d/high/components/renderer.hpp>
 #include <enduro2d/high/components/model_renderer.hpp>
-#include <enduro2d/high/assets/texture_asset.hpp>
-#include <enduro2d/high/assets/shader_asset.hpp>
 
 namespace
 {
     using namespace e2d;
 
-    f32 get_x_pos(const label& l, f32 string_width) {
+    class geometry_builder {
-        f32 x_pos{0};
+    public:
-        switch ( l.halign() ) {
+        geometry_builder() = default;
-            case label::haligns::left :
+
-                x_pos = 0;
+        void add_quad(
-            break;
+            const b2f& rect,
-            case label::haligns::center :
+            const b2f& texrect,
-                x_pos = -0.5f * string_width;
+            const color32& color)
-            break;
+        {
-            case label::haligns::right :
+            const std::size_t start_vertex = vertices_.size();
-                x_pos = -string_width;
+
-            break;
+            // Y
-            default:
+            // ^
-                E2D_ASSERT_MSG(false,"label_system: uncknow horizontal align flag");
+            // | 3 - 2
-            break;
+            // | | / |
+            // | 0 - 1
+            // +------> X
+
+            {
+                const v2f& gp = rect.position;
+                const v2f& gs = rect.size;
+
+                vertices_.emplace_back(gp.x + 0.0f, gp.y + 0.0f, 0.f);
+                vertices_.emplace_back(gp.x + gs.x, gp.y + 0.0f, 0.f);
+                vertices_.emplace_back(gp.x + gs.x, gp.y + gs.y, 0.f);
+                vertices_.emplace_back(gp.x + 0.0f, gp.y + gs.y, 0.f);
+            }
+
+            {
+                const v2f& tp = texrect.position;
+                const v2f& ts = texrect.size;
+
+                uvs_.emplace_back(tp.x + 0.0f, tp.y + 0.0f);
+                uvs_.emplace_back(tp.x + ts.x, tp.y + 0.0f);
+                uvs_.emplace_back(tp.x + ts.x, tp.y + ts.y);
+                uvs_.emplace_back(tp.x + 0.0f, tp.y + ts.y);
+            }
+
+            {
+                indices_.emplace_back(start_vertex + 0u);
+                indices_.emplace_back(start_vertex + 1u);
+                indices_.emplace_back(start_vertex + 2u);
+                indices_.emplace_back(start_vertex + 2u);
+                indices_.emplace_back(start_vertex + 3u);
+                indices_.emplace_back(start_vertex + 0u);
+            }
+
+            {
+                colors_.emplace_back(color);
+                colors_.emplace_back(color);
+                colors_.emplace_back(color);
+                colors_.emplace_back(color);
+            }
         }
 
-        return x_pos;
+        void update_model(model_renderer& mr) {
+            mesh new_mesh;
+            new_mesh.set_vertices(vertices_);
+            new_mesh.set_indices(0, indices_);
+            new_mesh.set_uvs(0, uvs_);
+            new_mesh.set_colors(0, colors_);
+
+            model new_model;
+            new_model.set_mesh(mesh_asset::create(std::move(new_mesh)));
+            new_model.regenerate_geometry(the<render>());
+
+            if ( mr.model() ) {
+                mr.model()->fill(std::move(new_model));
+            } else {
+                mr.model(model_asset::create(std::move(new_model)));
+            }
+        }
+
+        void clear() noexcept {
+            vertices_.clear();
+            uvs_.clear();
+            indices_.clear();
+            colors_.clear();
+        }
+    private:
+        vector<v3f> vertices_;
+        vector<v2f> uvs_;
+        vector<u32> indices_;
+        vector<color32> colors_;
+    };
+}
+
+namespace
+{
+    using namespace e2d;
+
+    f32 calculate_halign_offset(
+        label::haligns halign,
+        f32 string_width) noexcept
+    {
+        switch ( halign ) {
+        case label::haligns::left:
+            return 0.0f;
+        case label::haligns::center:
+            return -0.5f * string_width;
+        case label::haligns::right:
+            return -1.0f * string_width;
+        default:
+            E2D_ASSERT_MSG(false, "unexpected label halign");
+            return 0.f;
+        }
     }
 
-    f32 get_top_pos(const label& l, u32 strings_count) {
+    f32 calculate_valign_offset(
-        const auto& f = l.font()->content();
+        label::valigns valign,
-        f32 label_height = f.info().line_height * strings_count;
+        f32 leading,
-        f32 top{0};
+        u32 glyph_ascent,
-        switch ( l.valign() ) {
+        u32 line_height,
-            case label::valigns::top:
+        std::size_t string_count) noexcept
-                top = label_height;
+    {
-            break;
+        const f32 label_height = string_count > 1u
-            case label::valigns::center:
+            ? line_height + line_height * leading * (string_count - 1u)
-                top = 0.5f * label_height;
+            : line_height;
-            break;
+
-            case label::valigns::bottom:
+        switch ( valign ) {
-                top = 0;
+        case label::valigns::top:
-            break;
+            return 0.f;
-            case label::valigns::baseline:
+        case label::valigns::center:
-                top = label_height - (f.info().line_height - f.info().glyph_ascent);
+            return 0.5f * label_height;
-            break;
+        case label::valigns::bottom:
-            default:
+            return 1.0f * label_height;
-                E2D_ASSERT_MSG(false,"label_system: uncknow vertical align flag");
+        case label::valigns::baseline:
-            break;
+            return 1.0f * glyph_ascent;
+        default:
+            E2D_ASSERT_MSG(false, "unexpected label valign");
+            return 0.f;
+        }
+    }
+
+    std::size_t calculate_string_count(str32_view text) noexcept {
+        std::size_t count{0u};
+        for ( std::size_t i = 0; i < text.size(); ++i ) {
+            if ( text[i] == '\n' ) {
+                ++count;
+            }
+        }
+        return count;
+    }
+}
+
+namespace
+{
+    using namespace e2d;
+
+    void update_label_material(const label& l, renderer& r) {
+        if ( r.materials().empty() ) {
+            return;
         }
 
-        return top;
+        auto texture_p = the<library>().load_asset<texture_asset>(
+            l.font()->content().info().atlas_file);
+
+        const f32 glyph_dilate = math::clamp(l.glyph_dilate(), -1.f, 1.0f);
+        const f32 outline_width = math::clamp(l.outline_width(), 0.f, 1.f - glyph_dilate);
+        const v4f outline_color = make_vec4(color(l.outline_color()));
+
+        r.properties(render::property_block()
+            .sampler("u_texture", render::sampler_state()
+                .texture(texture_p->content())
+                .min_filter(render::sampler_min_filter::linear)
+                .mag_filter(render::sampler_mag_filter::linear))
+            .property("u_glyph_dilate", glyph_dilate)
+            .property("u_outline_width", outline_width)
+            .property("u_outline_color", outline_color));
+    }
+
+    void update_label_geometry(const label& l, model_renderer& mr, geometry_builder& gb) {
+        if ( !l.font() || l.font()->content().empty() || l.text().empty() ) {
+            gb.update_model(mr);
+            return;
+        }
+
+        const str32& text = l.text();
+        const font& f = l.font()->content();
+
+        //
+        // update glyphs
+        //
+
+        struct glyph_desc {
+            const font::glyph_info* glyph{nullptr};
+            f32 kerning{0.f};
+        };
+
+        vector<glyph_desc> glyphs;
+        glyphs.reserve(text.size());
+
+        for ( std::size_t i = 0, e = text.size(); i < e; ++i ) {
+            glyph_desc desc;
+            desc.glyph = f.find_glyph(text[i]);
+            desc.kerning = i > 0
+                ? f.get_kerning(text[i-1], text[i])
+                : 0.f;
+            glyphs.push_back(std::move(desc));
+
+            if ( !desc.glyph && text[i] != '\n' ) {
+                the<debug>().warning("LABEL: Missing font glyph:\n"
+                    "--> Code Point: %0",
+                    text[i]);
+            }
+        }
+
+        f32 tracking_width = 0.f;
+        if ( const font::glyph_info* sp = f.find_glyph(' '); sp ) {
+            tracking_width = sp->advance * l.tracking();
+        }
+
+        //
+        // update strings
+        //
+
+        struct string_desc {
+            f32 width{0.f};
+            std::size_t start{0};
+            std::size_t length{0};
+
+            string_desc(std::size_t start)
+            : start(start) {}
+        };
+
+        vector<string_desc> strings;
+        strings.reserve(calculate_string_count(text));
+
+        f32 last_space_width = 0.f;
+        std::size_t last_space_index = std::size_t(-1);
+
+        strings.push_back(string_desc(0u));
+
+        for ( std::size_t i = 0, e = text.size(); i < e; ++i ) {
+            const u32 code_point = text[i];
+            const glyph_desc& glyph = glyphs[i];
+
+            if ( code_point == ' ' ) {
+                last_space_width = strings.back().width;
+                last_space_index = i;
+            }
+
+            bool new_line = false;
+
+            if ( code_point == '\n' ) {
+                new_line = true;
+                strings.back().length = i - strings.back().start;
+            } else if ( glyph.glyph ) {
+                strings.back().width +=
+                    glyph.kerning +
+                    glyph.glyph->advance +
+                    tracking_width;
+
+                const bool break_line =
+                    l.text_width() > 0.f &&
+                    last_space_index != std::size_t(-1) &&
+                    strings.back().width > l.text_width();
+
+                if ( break_line ) {
+                    new_line = true;
+                    strings.back().width = last_space_width;
+                    strings.back().length = last_space_index - strings.back().start;
+                    i = last_space_index;
+                }
+            }
+
+            if ( i == e - 1 ) {
+                new_line = true;
+                strings.back().length = i + 1 - strings.back().start;
+            }
+
+            if ( new_line ) {
+                if ( i < e - 1 ) {
+                    strings.push_back(string_desc(i + 1u));
+                }
+                last_space_width = 0.f;
+                last_space_index = std::size_t(-1);
+            }
+        }
+
+        //
+        // update geometry
+        //
+
+        v2f cursor = v2f::unit_y() * calculate_valign_offset(
+            l.valign(),
+            l.leading(),
+            f.info().glyph_ascent,
+            f.info().line_height,
+            strings.size());
+
+        for ( std::size_t i = 0, ie = strings.size(); i < ie; ++i ) {
+            cursor.x = calculate_halign_offset(l.halign(), strings[i].width);
+            for ( std::size_t j = strings[i].start, je = strings[i].start + strings[i].length; j < je; ++j ) {
+                const glyph_desc& glyph = glyphs[j];
+                if ( !glyph.glyph ) {
+                    continue;
+                }
+
+                cursor.x += glyph.kerning;
+
+                b2f rect = make_rect(cursor, glyph.glyph->tex_rect.size.cast_to<f32>());
+                rect.position += glyph.glyph->offset.cast_to<f32>();
+
+                b2f texrect = glyph.glyph->tex_rect.cast_to<f32>();
+                texrect.position /= f.info().atlas_size.cast_to<f32>();
+                texrect.size /= f.info().atlas_size.cast_to<f32>();
+
+                gb.add_quad(rect, texrect, l.tint());
+                cursor.x += glyph.glyph->advance + tracking_width;
+            }
+            cursor.y -= f.info().line_height * l.leading();
+        }
+
+        //
+        // update model
+        //
+
+        gb.update_model(mr);
+    }
+
+    void update_dirty_labels(ecs::registry& owner) {
+        geometry_builder gb;
+        owner.for_joined_components<label::dirty, label, renderer, model_renderer>([&gb](
+            const ecs::const_entity&,
+            const label::dirty&,
+            const label& l,
+            renderer& r,
+            model_renderer& mr
+        ){
+            update_label_material(l, r);
+            update_label_geometry(l, mr, gb);
+            gb.clear();
+        });
+        owner.remove_all_components<label::dirty>();
     }
 }
 
@@ -74,222 +367,7 @@ namespace e2d
         ~internal_state() noexcept = default;
 
         void process(ecs::registry& owner) {
-            owner.for_joined_components<label::dirty, label, renderer, model_renderer>([](
+            update_dirty_labels(owner);
-                const ecs::const_entity&,
-                const label::dirty&,
-                const label& l,
-                renderer& r,
-                model_renderer& mr)
-            {
-                vector<v3f> vertices;
-                vector<u32> indices;
-                vector<v2f> uvs;
-                vector<v3f> normals;
-                vector<color32> colors;
-                v2f offset;
-                f32 kerning{0};
-                u32 prev_char{0};
-                str32 text = l.text();
-                if (text.empty()) {
-                    return;
-                }
-                const auto& f = l.font()->content();
-                v2f texture_size = f.info().atlas_size.cast_to<f32>();
-
-                if ( l.width() != 0 ) {
-                    f32 word_width{0};
-                    f32 string_width{0};
-                    i32 last_space{-1};
-                    for ( size_t i = 0; i < text.size(); i++ ) {
-                        const auto& ch = text[i];
-                        if ( ch == '\n' ) {
-                            word_width = 0;
-                            string_width = 0;
-                            last_space = -1;
-                        } else {
-                            const font::glyph_info* glyph = f.find_glyph(ch);
-                            if ( glyph ) {
-                                prev_char != 0
-                                    ? kerning = f.get_kerning(prev_char, ch)
-                                    : kerning = 0;
-                                prev_char = ch;
-                                f32 char_width = glyph->advance + kerning;
-                                if ( ch == ' ' ) {
-                                    if ( string_width + word_width < l.width() ) {
-                                        if ( string_width + word_width + char_width < l.width() ) {
-                                            string_width += word_width + char_width;
-                                            word_width = 0;
-                                            last_space = i;
-                                        } else {
-                                            text[i] = '\n';
-                                            word_width = 0;
-                                            string_width = 0;
-                                            last_space = -1;
-                                        }
-                                    } else {
-                                        if ( last_space != -1 ) {
-                                            text[last_space] = '\n';
-                                            last_space = -1;
-                                            string_width = 0;
-                                            --i;
-                                        } else {
-                                            text[i] = '\n';
-                                            word_width = 0;
-                                            string_width = 0;
-                                        }
-                                    }
-                                } else {
-                                    word_width += char_width;
-                                    if ( i == text.size() - 1) {
-                                        if ( string_width + word_width > l.width() ) {
-                                            if ( last_space != -1 ) {
-                                                text[last_space] = '\n';
-                                            }
-                                        }
-                                    }
-                                }
-                            }
-                        }
-                    }
-                }
-
-                size_t strings_count{1};
-                for ( size_t i = 0; i < text.size(); i++ ) {
-                    if ( text[i] == '\n' && i != text.size() - 1) {
-                        strings_count++;
-                    }
-                }
-                size_t letters_size{0};
-                vector<f32> strings_width(strings_count);
-                std::fill(strings_width.begin(), strings_width.end(), 0);
-                prev_char = 0;
-                for ( size_t i = 0, string_ind = 0; i < text.size(); i++ ) {
-                    if ( text[i] != '\n' ) {
-                        const font::glyph_info* glyph = f.find_glyph(text[i]);
-                        if ( glyph ) {
-                            letters_size++;
-                            prev_char != 0
-                                ? kerning = f.get_kerning(prev_char, text[i])
-                                : kerning = 0;
-                            strings_width[string_ind] += glyph->advance + kerning;
-                        }
-                    } else {
-                        string_ind++;
-                    }
-                }
-
-                vertices.resize(letters_size * 4);
-                uvs.resize(vertices.size());
-                colors.resize(vertices.size());
-                indices.resize(text.size() * 6);
-                f32 x_pos = get_x_pos(l, strings_width[0]);
-                f32 y_pos = get_top_pos(l, strings_count);
-                u32 letters_counter{0};
-                prev_char = 0;
-                for ( size_t i = 0, str_ind = 0; i < text.size(); i++ ) {
-                    if ( text[i] == '\n' ) {
-                        str_ind++;
-                        y_pos -= f.info().line_height;
-                        x_pos = get_x_pos(l, strings_width[str_ind]);
-                        prev_char = 0;
-                        continue;
-                    }
-                    const font::glyph_info* glyph = f.find_glyph(text[i]);
-                    if ( glyph ) {
-                        offset = glyph->offset.cast_to<f32>();
-                        prev_char != 0
-                            ? kerning = f.get_kerning(prev_char, text[i])
-                            : kerning = 0;
-                        offset.x += kerning;
-                        prev_char = text[i];
-                        size_t start_vertices = letters_counter * 4;
-                        vertices[start_vertices] = v3f(
-                            x_pos + offset.x,
-                            y_pos - offset.y - glyph->tex_rect.size.y,
-                            0);
-                        vertices[start_vertices + 1] = v3f(
-                            x_pos + offset.x,
-                            y_pos - offset.y,
-                            0);
-                        vertices[start_vertices + 2] = v3f(
-                            x_pos + glyph->tex_rect.size.x + offset.x,
-                            y_pos - offset.y,
-                            0);
-                        vertices[start_vertices + 3] = v3f(
-                            x_pos + glyph->tex_rect.size.x + offset.x,
-                            y_pos - offset.y - glyph->tex_rect.size.y,
-                            0);
-
-                        uvs[start_vertices] = v2f(
-                            glyph->tex_rect.position.x / texture_size.x,
-                            glyph->tex_rect.position.y / texture_size.y);
-                        uvs[start_vertices + 1] = v2f(
-                            glyph->tex_rect.position.x / texture_size.x,
-                            (glyph->tex_rect.position.y + glyph->tex_rect.size.y) / texture_size.y);
-                        uvs[start_vertices + 2] = v2f(
-                            (glyph->tex_rect.position.x + glyph->tex_rect.size.x) / texture_size.x,
-                            (glyph->tex_rect.position.y + glyph->tex_rect.size.y) / texture_size.y);
-                        uvs[start_vertices + 3] = v2f(
-                            (glyph->tex_rect.position.x + glyph->tex_rect.size.x) / texture_size.x,
-                            glyph->tex_rect.position.y / texture_size.y);
-
-                        colors[start_vertices]     = l.tint();
-                        colors[start_vertices + 1] = l.tint();
-                        colors[start_vertices + 2] = l.tint();
-                        colors[start_vertices + 3] = l.tint();
-
-                        size_t start_indices = i * 6;
-                        indices[start_indices]     = start_vertices;
-                        indices[start_indices + 1] = start_vertices + 1;
-                        indices[start_indices + 2] = start_vertices + 2;
-                        indices[start_indices + 3] = start_vertices + 2;
-                        indices[start_indices + 4] = start_vertices + 3;
-                        indices[start_indices + 5] = start_vertices;
-
-                        x_pos += glyph->advance + kerning;
-                        letters_counter++;
-                    }
-                }
-
-                mesh m;
-                m.set_vertices(std::move(vertices));
-                m.set_indices(0, std::move(indices));
-                m.set_uvs(0, std::move(uvs));
-                m.set_colors(0, std::move(colors));
-
-                model content;
-                content.set_mesh(mesh_asset::create(m));
-                content.regenerate_geometry(the<render>());
-
-                if ( !mr.model() ) {
-                    mr.model(model_asset::create(content));
-                } else {
-                    mr.model()->fill(content);
-                }
-
-                if ( r.materials().size() > 0 &&
-                     r.materials().front()->content().properties().sampler_count() == 0 ) {
-                    auto texture_p = the<library>().load_asset<texture_asset>(f.info().atlas_file);
-                    if ( !texture_p ) {
-                        return;
-                    }
-
-                    const f32 glyph_dilate = math::clamp(l.glyph_dilate(), -1.f, 1.0f);
-                    const f32 outline_width = math::clamp(l.outline_width(), 0.f, 1.f - glyph_dilate);
-                    const v4f outline_color = make_vec4(color(l.outline_color()));
-
-                    r.properties(render::property_block()
-                        .sampler("u_texture", render::sampler_state()
-                            .texture(texture_p->content())
-                            .min_filter(render::sampler_min_filter::linear)
-                            .mag_filter(render::sampler_mag_filter::linear))
-                        .property("u_glyph_dilate", glyph_dilate)
-                        .property("u_outline_width", outline_width)
-                        .property("u_outline_color", outline_color));
-                }
-            });
-
-            owner.remove_all_components<label::dirty>();
         }
     };