update ModelBatch semantics

src/assets/assetload_funcs.cpp

@@ -122,9 +122,9 @@ assetload::postfunc assetload::font(
 ) {
     auto pages = std::make_shared<std::vector<std::unique_ptr<ImageData>>>();
     for (size_t i = 0; i <= 4; i++) {
-        std::string name = filename + "_" + std::to_string(i) + ".png"; 
-        name = paths->find(name).string();
-        pages->push_back(imageio::read(name));
+        std::string pagefile = filename + "_" + std::to_string(i) + ".png"; 
+        pagefile = paths->find(pagefile).string();
+        pages->push_back(imageio::read(pagefile));
     }
     return [=](auto assets) {
         int res = pages->at(0)->getHeight() / 16;

src/frontend/debug_panel.cpp

@@ -62,6 +62,11 @@ std::shared_ptr<UINode> create_debug_panel(
     panel->add(create_label([](){
         return L"meshes: " + std::to_wstring(Mesh::meshesCount);
     }));
+    panel->add(create_label([](){
+        int drawCalls = Mesh::drawCalls;
+        Mesh::drawCalls = 0;
+        return L"draw-calls: " + std::to_wstring(drawCalls);
+    }));
     panel->add(create_label([](){
         return L"speakers: " + std::to_wstring(audio::count_speakers())+
                L" streams: " + std::to_wstring(audio::count_streams());

src/graphics/core/Mesh.cpp

@@ -2,6 +2,7 @@
 #include <GL/glew.h>
 
 int Mesh::meshesCount = 0;
+int Mesh::drawCalls = 0;
 
 Mesh::Mesh(const float* vertexBuffer, size_t vertices, const int* indexBuffer, size_t indices, const vattr* attrs) : 
     ibo(0),
@@ -60,6 +61,7 @@ void Mesh::reload(const float* vertexBuffer, size_t vertices, const int* indexBu
 }
 
 void Mesh::draw(unsigned int primitive){
+    drawCalls++;
     glBindVertexArray(vao);
     if (ibo != 0) {
         glDrawElements(primitive, indices, GL_UNSIGNED_INT, 0);

src/graphics/core/Mesh.hpp

@@ -37,6 +37,7 @@ public:
 
     /// @brief Total numbers of alive mesh objects
     static int meshesCount;
+    static int drawCalls;
 };
 
 #endif // GRAPHICS_CORE_MESH_HPP_

src/graphics/render/ModelBatch.cpp

@@ -50,8 +50,8 @@ ModelBatch::ModelBatch(size_t capacity, Assets* assets, Chunks* chunks)
 ModelBatch::~ModelBatch() {
 }
 
-void ModelBatch::draw(const model::Model* model) {
-    glm::vec3 gpos = combined * glm::vec4(glm::vec3(), 1.0f);
+void ModelBatch::draw(const model::Mesh& mesh, const glm::mat4& matrix, const glm::mat3& rotation) {
+    glm::vec3 gpos = matrix * glm::vec4(glm::vec3(), 1.0f);
     light_t light = chunks->getLight(gpos.x, gpos.y, gpos.z);
     glm::vec4 lights (
         Lightmap::extract(light, 0) / 15.0f,
@@ -59,31 +59,44 @@ void ModelBatch::draw(const model::Model* model) {
         Lightmap::extract(light, 2) / 15.0f,
         Lightmap::extract(light, 3) / 15.0f
     );
-    for (const auto& mesh : model->meshes) {
-        auto texture = assets->get<Texture>(mesh.texture);
-        if (texture) {
-            texture->bind();
-        } else {
-            blank->bind();
+    setTexture(assets->get<Texture>(mesh.texture));
+    size_t vcount = mesh.vertices.size();
+    const auto& vertexData = mesh.vertices.data();
+    for (size_t i = 0; i < vcount / 3; i++) {
+        if (index + VERTEX_SIZE * 3 > capacity * VERTEX_SIZE) {
+            flush();
         }
-        for (size_t i = 0; i < mesh.vertices.size() / 3; i++) {
-            if (index + VERTEX_SIZE * 3 > capacity) {
-                flush();
-            }
-            for (size_t j = 0; j < 3; j++) {
-                const auto& vert = mesh.vertices[i * 3 + j];
-                auto norm = rotation * vert.normal;
-                float d = glm::dot(norm, SUN_VECTOR);
-                d = 0.8f + d * 0.2f;
-                
-                auto color = lights * d;
-                vertex(vert.coord, vert.uv, color);
-            }
+        for (size_t j = 0; j < 3; j++) {
+            const auto& vert = vertexData[i * 3 + j];
+            auto norm = rotation * vert.normal;
+            float d = glm::dot(norm, SUN_VECTOR);
+            d = 0.8f + d * 0.2f;
+            
+            auto color = lights * d;
+            vertex(matrix * glm::vec4(vert.coord, 1.0f), vert.uv, color);
         }
-        flush();
     }
 }
 
+void ModelBatch::draw(const model::Model* model) {
+    for (const auto& mesh : model->meshes) {
+        entries.push_back({combined, rotation, &mesh});
+    }
+}
+
+void ModelBatch::render() {
+    std::sort(entries.begin(), entries.end(), 
+        [](const DrawEntry& a, const DrawEntry& b) {
+            return a.mesh->texture < b.mesh->texture;
+        }
+    );
+    for (auto& entry : entries) {
+        draw(*entry.mesh, entry.matrix, entry.rotation);
+    }
+    flush();
+    entries.clear();
+}
+
 void ModelBatch::box(glm::vec3 pos, glm::vec3 size, glm::vec4 lights) {
     if (index + 36 < capacity*VERTEX_SIZE) {
         flush();
@@ -98,11 +111,24 @@ void ModelBatch::box(glm::vec3 pos, glm::vec3 size, glm::vec4 lights) {
     plane(pos-X*size, Z*size, Y*size, -X, lights);
 }
 
+void ModelBatch::setTexture(Texture* texture) {
+    if (texture == nullptr) {
+        texture = blank.get();
+    }
+    if (texture != this->texture) {
+        flush();
+    }
+    this->texture = texture;
+}
+
 void ModelBatch::flush() {
     if (index == 0) {
         return;
     }
-    // blank->bind();
+    if (texture == nullptr) {
+        texture = blank.get();
+    }
+    texture->bind();
     mesh->reload(buffer.get(), index / VERTEX_SIZE);
     mesh->draw();
     index = 0;

src/graphics/render/ModelBatch.hpp

@@ -11,12 +11,13 @@ class Chunks;
 class Assets;
 
 namespace model {
+    struct Mesh;
     struct Model;
 }
 
 class ModelBatch {
-    std::unique_ptr<float[]> buffer;
-    size_t capacity;
+    std::unique_ptr<float[]> const buffer;
+    size_t const capacity;
     size_t index;
 
     std::unique_ptr<Mesh> mesh;
@@ -28,6 +29,7 @@ class ModelBatch {
 
     Assets* assets;
     Chunks* chunks;
+    Texture* texture = nullptr;
 
     static inline glm::vec3 SUN_VECTOR {0.411934f, 0.863868f, -0.279161f};
 
@@ -35,7 +37,6 @@ class ModelBatch {
         glm::vec3 pos, glm::vec2 uv, glm::vec4 light
     ) {
         float* buffer = this->buffer.get();
-        pos = combined * glm::vec4(pos, 1.0f);
         buffer[index++] = pos.x;
         buffer[index++] = pos.y;
         buffer[index++] = pos.z;
@@ -70,6 +71,18 @@ class ModelBatch {
         vertex(pos+right+up, {1,1}, color);
         vertex(pos-right+up, {0,1}, color);
     }
+
+    void draw(const model::Mesh& mesh, const glm::mat4& matrix, const glm::mat3& rotation);
+    void box(glm::vec3 pos, glm::vec3 size, glm::vec4 lights);
+    void setTexture(Texture* texture);
+    void flush();
+
+    struct DrawEntry {
+        glm::mat4 matrix;
+        glm::mat3 rotation;
+        const model::Mesh* mesh;
+    };
+    std::vector<DrawEntry> entries;
 public:
     ModelBatch(size_t capacity, Assets* assets, Chunks* chunks);
     ~ModelBatch();
@@ -80,12 +93,9 @@ public:
 
     void pushMatrix(glm::mat4 matrix);
     void popMatrix();
-
-    void box(glm::vec3 pos, glm::vec3 size, glm::vec4 lights);
-
     void draw(const model::Model* model);
 
-    void flush();
+    void render();
 };
 
 #endif // GRAPHICS_RENDER_MODEL_BATCH_HPP_

src/graphics/render/WorldRenderer.cpp

@@ -50,7 +50,7 @@ WorldRenderer::WorldRenderer(Engine* engine, LevelFrontend* frontend, Player* pl
     player(player),
     frustumCulling(std::make_unique<Frustum>()),
     lineBatch(std::make_unique<LineBatch>()),
-    modelBatch(std::make_unique<ModelBatch>(1000, engine->getAssets(), level->chunks.get()))
+    modelBatch(std::make_unique<ModelBatch>(20'000, engine->getAssets(), level->chunks.get()))
 {
     renderer = std::make_unique<ChunksRenderer>(
         level,
@@ -195,7 +195,25 @@ void WorldRenderer::renderLevel(
     drawChunks(level->chunks.get(), camera, shader);
 
     shader->uniformMatrix("u_model", glm::mat4(1.0f));
-    /// draw models here
+    if (auto model = assets->get<model::Model>("cube")) {
+        srand(0);
+        float timer = Window::time();
+        for (size_t i = 0; i < 10000; i++) {
+            float x = (rand() % 5000)*0.1f;
+            float y = (rand() % 1000)*0.1f + 60;
+            float z = (rand() % 5000)*0.1f;
+            glm::vec3 coord(x, y, z);
+            int rot = rand() % 1000;
+            if (frustumCulling->IsBoxVisible(coord, coord)) {
+                modelBatch->translate(coord);
+                modelBatch->rotate(glm::vec3(0, 1, 0), timer*3+rot);
+                modelBatch->draw(model);
+                modelBatch->popMatrix();
+                modelBatch->popMatrix();
+            }
+        }
+    }
+    modelBatch->render();
 
     skybox->unbind();
 }