Fix transparency

doc/en/block-properties.md

@@ -39,6 +39,12 @@ Block model type from list:
 
 Integer specifying number of block draw group (render order). Used for semi-transparent blocks.
 
+### *translucent*
+
+Enables translucency support in block textures (examples: water, ice).
+Should only be used when needed, as it impacts performance.
+Not required for full transparency (grass, flowers).
+
 ### *rotation*
 
 Rotation profile (set of available block rotations and behaviour of placing block rotation) from list:

doc/ru/block-properties.md

@@ -40,6 +40,12 @@
 Целое число определяющее номер группы отрисовки данного блока. 
 Актуально для полупрозрачных блоков - решает проблемы невидимых сторон блоков за этим блоком.
 
+### Полупрозрачность - *translucent*
+
+Включает поддержку полупрозрачности в текстурах блока (примеры: вода, лёд).
+Следует использовать только при надобности, так как влияет на производительность.
+Не требуется для полной прозрачности (трава, цветы).
+
 ### Вращение - *rotation*
 
 Профиль вращения (набор положений, в которые можно установить блок) из списка:

res/content/base/blocks/glass.json

@@ -3,5 +3,6 @@
     "material": "base:glass",
     "draw-group": 2,
     "light-passing": true,
-    "sky-light-passing": true
+    "sky-light-passing": true,
+    "translucent": true
 }

res/content/base/blocks/ice.json

@@ -0,0 +1,7 @@
+{
+    "texture": "ice",
+    "material": "base:glass",
+    "draw-group": 4,
+    "light-passing": true,
+    "translucent": true
+}

res/content/base/blocks/water.json

@@ -6,5 +6,6 @@
     "sky-light-passing": false,
     "obstacle": false,
     "selectable": false,
-    "replaceable": true
+    "replaceable": true,
+    "translucent": true
 }

res/content/base/content.json

@@ -1,6 +1,8 @@
 {
-  "items": [
-    "bazalt_breaker"
+  "entities": [
+    "drop",
+    "player",
+    "falling_block"
   ],
   "blocks": [
     "dirt",
@@ -27,11 +29,10 @@
     "lightbulb",
     "torch",
     "wooden_door",
-    "coal_ore"
+    "coal_ore",
+    "ice"
   ],
-  "entities": [
-    "drop",
-    "player",
-    "falling_block"
+  "items": [
+    "bazalt_breaker"
   ]
 }

res/shaders/main.glslf

@@ -9,14 +9,14 @@ uniform samplerCube u_cubemap;
 uniform vec3 u_fogColor;
 uniform float u_fogFactor;
 uniform float u_fogCurve;
+uniform bool u_alphaClip;
 
 void main() {
     vec3 fogColor = texture(u_cubemap, a_dir).rgb;
     vec4 tex_color = texture(u_texture0, a_texCoord);
     float depth = (a_distance/256.0);
     float alpha = a_color.a * tex_color.a;
-    // anyway it's any alpha-test alternative required
-    if (alpha < 0.3f)
+    if (u_alphaClip && alpha < 0.9f)
         discard;
     f_color = mix(a_color * tex_color, vec4(fogColor,1.0), 
               min(1.0, pow(depth*u_fogFactor, u_fogCurve)));

src/constants.hpp

@@ -35,9 +35,6 @@ inline constexpr int CHUNK_D = 16;
 inline constexpr uint VOXEL_USER_BITS = 8;
 inline constexpr uint VOXEL_USER_BITS_OFFSET = sizeof(blockstate_t)*8-VOXEL_USER_BITS;
 
-/// @brief pixel size of an item inventory icon
-inline constexpr int ITEM_ICON_SIZE = 48;
-
 /// @brief chunk volume (count of voxels per Chunk)
 inline constexpr int CHUNK_VOL = (CHUNK_W * CHUNK_H * CHUNK_D);
 
@@ -53,6 +50,11 @@ inline constexpr uint vox_index(uint x, uint y, uint z, uint w=CHUNK_W, uint d=C
     return (y * d + z) * w + x;
 }
 
+/// @brief pixel size of an item inventory icon
+inline constexpr int ITEM_ICON_SIZE = 48;
+
+inline constexpr int TRANSLUCENT_BLOCKS_SORT_INTERVAL = 8;
+
 inline const std::string SHADERS_FOLDER = "shaders";
 inline const std::string TEXTURES_FOLDER = "textures";
 inline const std::string FONTS_FOLDER = "fonts";

src/content/ContentLoader.cpp

@@ -333,6 +333,7 @@ void ContentLoader::loadBlock(
     root.at("inventory-size").get(def.inventorySize);
     root.at("tick-interval").get(def.tickInterval);
     root.at("overlay-texture").get(def.overlayTexture);
+    root.at("translucent").get(def.translucent);
 
     if (root.has("fields")) {
         def.dataStruct = std::make_unique<StructLayout>();

src/graphics/core/Batch2D.cpp

@@ -11,7 +11,7 @@
 inline constexpr uint B2D_VERTEX_SIZE = 8;
 
 Batch2D::Batch2D(size_t capacity) : capacity(capacity), color(1.0f){
-    const vattr attrs[] = {
+    const VertexAttribute attrs[] = {
         {2}, {2}, {4}, {0}
     };
 

src/graphics/core/Batch3D.cpp

@@ -12,7 +12,7 @@ inline constexpr uint B3D_VERTEX_SIZE = 9;
 
 Batch3D::Batch3D(size_t capacity) 
     : capacity(capacity) {
-    const vattr attrs[] = {
+    const VertexAttribute attrs[] = {
         {3}, {2}, {4}, {0}
     };
 

src/graphics/core/LineBatch.cpp

@@ -6,7 +6,7 @@
 inline constexpr uint LB_VERTEX_SIZE = (3+4);
 
 LineBatch::LineBatch(size_t capacity) : capacity(capacity) {
-    const vattr attrs[] = { {3},{4}, {0} };
+    const VertexAttribute attrs[] = { {3},{4}, {0} };
     buffer = std::make_unique<float[]>(capacity * LB_VERTEX_SIZE * 2);
     mesh = std::make_unique<Mesh>(buffer.get(), 0, attrs);
     index = 0;

src/graphics/core/Mesh.cpp

@@ -4,7 +4,7 @@
 int Mesh::meshesCount = 0;
 int Mesh::drawCalls = 0;
 
-inline size_t calc_vertex_size(const vattr* attrs) {
+inline size_t calc_vertex_size(const VertexAttribute* attrs) {
     size_t vertexSize = 0;
     for (int i = 0; attrs[i].size; i++) {
         vertexSize += attrs[i].size;
@@ -19,10 +19,10 @@ Mesh::Mesh(const MeshData& data)
         data.indices.size(),
         data.attrs.data()) {}
 
-Mesh::Mesh(const float* vertexBuffer, size_t vertices, const int* indexBuffer, size_t indices, const vattr* attrs) : 
+Mesh::Mesh(const float* vertexBuffer, size_t vertices, const int* indexBuffer, size_t indices, const VertexAttribute* attrs) : 
     ibo(0),
-    vertices(vertices),
-    indices(indices)
+    vertices(0),
+    indices(0)
 {
     meshesCount++;
     vertexSize = 0;
@@ -58,10 +58,9 @@ void Mesh::reload(const float* vertexBuffer, size_t vertices, const int* indexBu
     glBindVertexArray(vao);
     glBindBuffer(GL_ARRAY_BUFFER, vbo);
     if (vertexBuffer != nullptr && vertices != 0) {
-        glBufferData(GL_ARRAY_BUFFER, sizeof(float) * vertexSize * vertices, vertexBuffer, GL_STATIC_DRAW);
-    }
-    else {
-        glBufferData(GL_ARRAY_BUFFER, 0, {}, GL_STATIC_DRAW);
+        glBufferData(GL_ARRAY_BUFFER, sizeof(float) * vertexSize * vertices, vertexBuffer, GL_STREAM_DRAW);
+    } else {
+        glBufferData(GL_ARRAY_BUFFER, 0, {}, GL_STREAM_DRAW);
     }
     if (indexBuffer != nullptr && indices != 0) {
         if (ibo == 0) glGenBuffers(1, &ibo);
@@ -75,7 +74,7 @@ void Mesh::reload(const float* vertexBuffer, size_t vertices, const int* indexBu
     this->indices = indices;
 }
 
-void Mesh::draw(unsigned int primitive){
+void Mesh::draw(unsigned int primitive) const {
     drawCalls++;
     glBindVertexArray(vao);
     if (ibo != 0) {
@@ -87,6 +86,6 @@ void Mesh::draw(unsigned int primitive){
     glBindVertexArray(0);
 }
 
-void Mesh::draw() {
+void Mesh::draw() const {
     draw(GL_TRIANGLES);
 }

src/graphics/core/Mesh.hpp

@@ -14,8 +14,8 @@ class Mesh {
     size_t vertexSize;
 public:
     Mesh(const MeshData& data);
-    Mesh(const float* vertexBuffer, size_t vertices, const int* indexBuffer, size_t indices, const vattr* attrs);
-    Mesh(const float* vertexBuffer, size_t vertices, const vattr* attrs) :
+    Mesh(const float* vertexBuffer, size_t vertices, const int* indexBuffer, size_t indices, const VertexAttribute* attrs);
+    Mesh(const float* vertexBuffer, size_t vertices, const VertexAttribute* attrs) :
         Mesh(vertexBuffer, vertices, nullptr, 0, attrs) {};
     ~Mesh();
 
@@ -28,10 +28,10 @@ class Mesh {
 
     /// @brief Draw mesh with specified primitives type
     /// @param primitive primitives type
-    void draw(unsigned int primitive);
+    void draw(unsigned int primitive) const;
 
     /// @brief Draw mesh as triangles
-    void draw();
+    void draw() const;
 
     /// @brief Total numbers of alive mesh objects
     static int meshesCount;

src/graphics/core/MeshData.hpp

@@ -6,15 +6,15 @@
 #include "util/Buffer.hpp"
 
 /// @brief Vertex attribute info
-struct vattr {
+struct VertexAttribute {
     ubyte size;
 };
 
 /// @brief Raw mesh data structure
 struct MeshData {
     util::Buffer<float> vertices;
     util::Buffer<int> indices;
-    util::Buffer<vattr> attrs;
+    util::Buffer<VertexAttribute> attrs;
 
     MeshData() = default;
 
@@ -24,7 +24,7 @@ struct MeshData {
     MeshData(
         util::Buffer<float> vertices, 
         util::Buffer<int> indices,
-        util::Buffer<vattr> attrs
+        util::Buffer<VertexAttribute> attrs
     ) : vertices(std::move(vertices)),
         indices(std::move(indices)),
         attrs(std::move(attrs)) {}

src/graphics/core/PostProcessing.cpp

@@ -14,7 +14,7 @@ PostProcessing::PostProcessing() {
         -1.0f, -1.0f, -1.0f, 1.0f, 1.0f, 1.0f,
         -1.0f, -1.0f,  1.0f, 1.0f, 1.0f, -1.0f
     };
-    vattr attrs[] {{2}, {0}};
+    VertexAttribute attrs[] {{2}, {0}};
     quadMesh = std::make_unique<Mesh>(vertices, 6, attrs);
 }