From 44003667197fba6a858c16a35ea8c71b9377781f Mon Sep 17 00:00:00 2001
From: MihailRis <mexaruc@gmail.com>
Date: Sat, 16 Nov 2024 07:41:36 +0300
Subject: [PATCH] feat: actually working slow prototype

---
 src/graphics/render/BlocksRenderer.cpp | 26 ++++++-----
 src/graphics/render/ChunksRenderer.cpp | 60 ++++++++++++++++++++++++++
 src/graphics/render/ChunksRenderer.hpp |  2 +
 src/graphics/render/commons.hpp        |  5 +++
 4 files changed, 83 insertions(+), 10 deletions(-)

diff --git a/src/graphics/render/BlocksRenderer.cpp b/src/graphics/render/BlocksRenderer.cpp
index 25e8997d..fcba92c3 100644
--- a/src/graphics/render/BlocksRenderer.cpp
+++ b/src/graphics/render/BlocksRenderer.cpp
@@ -452,9 +452,9 @@ void BlocksRenderer::render(
             if (id == 0 || def.drawGroup != drawGroup || state.segment) {
                 continue;
             }
-            //if (def.translucent) {
-            //    continue;
-            //}
+            if (def.translucent) {
+                continue;
+            }
             const UVRegion texfaces[6] {
                 cache.getRegion(id, 0), cache.getRegion(id, 1),
                 cache.getRegion(id, 2), cache.getRegion(id, 3),
@@ -496,7 +496,6 @@ void BlocksRenderer::render(
 SortingMeshData BlocksRenderer::renderTranslucent(
     const voxel* voxels, int beginEnds[256][2]
 ) {
-    timeutil::ScopeLogTimer log(555);
     SortingMeshData sortingMesh {{}};
 
     for (const auto drawGroup : *content.drawGroups) {
@@ -550,16 +549,23 @@ SortingMeshData BlocksRenderer::renderTranslucent(
             if (vertexOffset == 0) {
                 continue;
             }
-            SortingMeshEntry entry {glm::vec3(
-                    x + chunk->x * CHUNK_W, y, z + chunk->z * CHUNK_D
-            ), util::Buffer<float>(indexSize * VERTEX_SIZE)};
-            
+            SortingMeshEntry entry {
+                glm::vec3(
+                    x + chunk->x * CHUNK_W + 0.5f,
+                    y + 0.5f,
+                    z + chunk->z * CHUNK_D + 0.5f
+                ),
+                util::Buffer<float>(indexSize * VERTEX_SIZE)};
+
             for (int j = 0; j < indexSize; j++) {
                 std::memcpy(
-                    entry.vertexData.data(),
+                    entry.vertexData.data() + j * VERTEX_SIZE,
                     vertexBuffer.get() + indexBuffer[j] * VERTEX_SIZE,
                     sizeof(float) * VERTEX_SIZE
                 );
+                entry.vertexData[j * VERTEX_SIZE + 0] += chunk->x * CHUNK_W + 0.5f;
+                entry.vertexData[j * VERTEX_SIZE + 1] += 0.5f;
+                entry.vertexData[j * VERTEX_SIZE + 2] += chunk->z * CHUNK_D + 0.5f;
             }
             sortingMesh.entries.push_back(std::move(entry));
             vertexOffset = 0;
@@ -569,7 +575,7 @@ SortingMeshData BlocksRenderer::renderTranslucent(
     return sortingMesh;
 }
 
-void BlocksRenderer::build(const Chunk* chunk, const Chunks* chunks) {
+void BlocksRenderer::build(const Chunk* chunk, const Chunks* chunks) {;
     this->chunk = chunk;
     voxelsBuffer->setPosition(
         chunk->x * CHUNK_W - voxelBufferPadding, 0,
diff --git a/src/graphics/render/ChunksRenderer.cpp b/src/graphics/render/ChunksRenderer.cpp
index 847163fc..ed313e08 100644
--- a/src/graphics/render/ChunksRenderer.cpp
+++ b/src/graphics/render/ChunksRenderer.cpp
@@ -18,6 +18,8 @@
 #include <glm/glm.hpp>
 #include <glm/ext.hpp>
 
+#include "util/timeutil.hpp"
+
 static debug::Logger logger("chunks-render");
 
 size_t ChunksRenderer::visibleChunks = 0;
@@ -204,4 +206,62 @@ void ChunksRenderer::drawChunks(
             visibleChunks += drawChunk(indices[i].index, camera, shader, culling);
         }
     //}
+    drawSortedMeshes(camera, shader);
+}
+
+void ChunksRenderer::drawSortedMeshes(const Camera& camera, Shader& shader) {
+    const vattr attrs[]{ {3}, {2}, {1}, {0} };
+
+    std::vector<const SortingMeshEntry*> entries;
+
+    auto pposition = camera.position;
+    
+    size_t size = 0;
+    bool culling = settings.graphics.frustumCulling.get();
+    for (size_t i = 0; i < indices.size(); i++) {
+        auto chunk = level.chunks->getChunks()[indices[i].index];
+        if (chunk == nullptr || !chunk->flags.lighted) {
+            continue;
+        }
+        const auto& found = meshes.find(glm::ivec2(chunk->x, chunk->z));
+        if (found == meshes.end()) {
+            continue;
+        }
+
+        glm::vec3 min(chunk->x * CHUNK_W, chunk->bottom, chunk->z * CHUNK_D);
+        glm::vec3 max(
+            chunk->x * CHUNK_W + CHUNK_W,
+            chunk->top,
+            chunk->z * CHUNK_D + CHUNK_D
+        );
+
+        if (!frustum.isBoxVisible(min, max)) continue;
+
+        auto& chunkEntries = found->second.sortingMesh.entries;
+        for (auto& entry : chunkEntries) {
+            entry.distance = glm::distance2(entry.position, pposition);
+        }
+        for (const auto& entry : chunkEntries) {
+            size += entry.vertexData.size();
+            entries.push_back(&entry);
+        }
+    }
+    std::sort(entries.begin(), entries.end(), [=](const auto& a, const auto& b) {
+        return *a < *b;
+    });
+
+    util::Buffer<float> buffer(size);
+    size_t offset = 0;
+    for (const auto& entry : entries) {
+        std::memcpy(
+            (buffer.data() + offset),
+            entry->vertexData.data(),
+            entry->vertexData.size() * sizeof(float)
+        );
+        offset += entry->vertexData.size();
+    }
+    Mesh mesh(buffer.data(), size / 6, attrs);
+
+    shader.uniformMatrix("u_model", glm::mat4(1.0f));
+    mesh.draw();
 }
diff --git a/src/graphics/render/ChunksRenderer.hpp b/src/graphics/render/ChunksRenderer.hpp
index e44940ea..cd1df2fb 100644
--- a/src/graphics/render/ChunksRenderer.hpp
+++ b/src/graphics/render/ChunksRenderer.hpp
@@ -75,6 +75,8 @@ public:
     );
     void drawChunks(const Camera& camera, Shader& shader);
 
+    void drawSortedMeshes(const Camera& camera, Shader& shader);
+
     void update();
 
     static size_t visibleChunks;
diff --git a/src/graphics/render/commons.hpp b/src/graphics/render/commons.hpp
index 4101f8a8..3ef8fa26 100644
--- a/src/graphics/render/commons.hpp
+++ b/src/graphics/render/commons.hpp
@@ -12,6 +12,11 @@ class Mesh;
 struct SortingMeshEntry {
     glm::vec3 position;
     util::Buffer<float> vertexData;
+    float distance;
+
+    inline bool operator<(const SortingMeshEntry& o) const noexcept {
+        return distance > o.distance;
+    }
 };
 
 struct SortingMeshData {