add WeatherPreset

src/graphics/render/PrecipitationRenderer.cpp

@@ -10,6 +10,7 @@
 #include "maths/voxmaths.hpp"
 #include "util/CentredMatrix.hpp"
 #include "settings.hpp"
+#include "presets/WeatherPreset.hpp"
 #include "voxels/Chunk.hpp"
 #include "voxels/Chunks.hpp"
 #include "window/Camera.hpp"
@@ -62,33 +63,62 @@ static inline glm::vec4 light_at(const Chunks& chunks, int x, int y, int z) {
     );
 }
 
-void PrecipitationRenderer::render(const Camera& camera, float delta) {
-    timer += delta * 0.5f;
-    batch->begin();
+/// @brief 'Random' vertical texture coord offset to randomize rain layers
+static constexpr float K = 21.41149;
+/// @brief Precipitation face size
+static constexpr glm::ivec2 FACE_SIZE {1, 16};
 
-    util::PseudoRandom random(0);
+static UVRegion calc_uv(
+    const glm::vec3& pos,
+    const glm::vec3& right,
+    float timer,
+    const WeatherPreset& weather
+) {
+    static util::PseudoRandom random(0);
+
+    float scale = weather.fall.scale;
+
+    float m = glm::sign(right.x + right.z);
+    int ux = pos.x;
+    int uz = pos.z;
+    if (glm::abs(right.x) < glm::abs(right.z)) {
+        std::swap(ux, uz);
+    }
+    random.setSeed(uz);
+    float hspeed = (random.randFloat() * 2.0f - 1.0f) * weather.fall.hspeed;
+    float u1 = ux * scale + timer * hspeed * -m;
+    float v1 = timer * weather.fall.vspeed + pos.y * scale + uz * K;
+
+    return {u1, v1, u1 + m * scale, v1 + FACE_SIZE.y * scale};
+}
+
+void PrecipitationRenderer::render(const Camera& camera, float delta) {
+    timer += delta;
+
+    WeatherPreset weather {};
+    auto& fall = weather.fall;
+    fall.texture = "misc/rain";
+
+    const int radius = 6;
+    const int depth = 12;
 
     int x = glm::floor(camera.position.x);
     int y = glm::floor(camera.position.y);
     int z = glm::floor(camera.position.z);
 
-    auto& texture = assets.require<Texture>("misc/snow");
+    util::CentredMatrix<int, (depth + 1) * 2> heights;
+    heights.setCenter(x, z);
+    for (int z = heights.beginY(); z < heights.endY(); z++) {
+        for (int x = heights.beginX(); x < heights.endX(); x++) {
+            heights.at(x, z) = getHeightAt(x, z);
+        }
+    }
+
+    batch->begin();
+    auto& texture = assets.require<Texture>(fall.texture);
     texture.setMipMapping(false);
     batch->setTexture(&texture, {});
 
-    const auto& front = camera.front;
-    glm::ivec2 size {1, 16};
-
-    float horizontal = 0.5f * 5;
-
-    glm::vec4 light = light_at(chunks, x, y, z);
-
-    const int radius = 6;
-    const int depth = 12;
-    float scale = 0.4f;
-    int quads = 0;
-    float k = 21.41149;
-
     const struct {
         glm::vec3 right;
         glm::vec3 front;
@@ -99,14 +129,6 @@ void PrecipitationRenderer::render(const Camera& camera, float delta) {
         {{0, 0, 1}, {1, 0, 0}},
     };
 
-    util::CentredMatrix<int, (depth + 1) * 2> heights;
-    heights.setCenter(x, z);
-    for (int z = heights.beginY(); z < heights.endY(); z++) {
-        for (int x = heights.beginX(); x < heights.endX(); x++) {
-            heights.at(x, z) = getHeightAt(x, z);
-        }
-    }
-
     for (const auto& face : faces) {
         for (int lx = -radius; lx <= radius; lx++) {
             for (int lz = depth; lz > 0; lz--) {
@@ -114,34 +136,20 @@ void PrecipitationRenderer::render(const Camera& camera, float delta) {
                 glm::vec3 pos = face.right * static_cast<float>(lx) +
                                 face.front * static_cast<float>(lz);
                 pos += glm::vec3(x, 0, z);
-                pos.y = glm::max(y - size.y / 2, heights.at(pos.x, pos.z)) +
-                        size.y / 2 + 1;
+                pos.y =
+                    glm::max(y - FACE_SIZE.y / 2, heights.at(pos.x, pos.z)) +
+                    FACE_SIZE.y / 2 + 1;
                 pos += glm::vec3(0.5f, 0.0f, 0.5f);
-                
-                // UV coords calculations
-                float m = glm::sign(face.right.x + face.right.z);
-                int ux = pos.x;
-                int uz = pos.z;
-
-                if (glm::abs(face.right.x) < glm::abs(face.right.z)) {
-                    std::swap(ux, uz);
-                }
-
-                random.setSeed(uz);
-                float hspeed = (random.randFloat() * 2.0f - 1.0f) * horizontal;
-                float u1 = ux * scale + timer * hspeed * -m;
-                float v1 = timer + pos.y * scale + uz * k;
 
                 // Draw
-                glm::vec4 light = light_at(chunks, pos.x, y, pos.z);
                 batch->quad(
                     pos,
                     face.right,
                     {0, 1, 0},
-                    size,
-                    light,
+                    FACE_SIZE,
+                    light_at(chunks, pos.x, y, pos.z),
                     glm::vec3(1.0f),
-                    UVRegion(u1, v1, u1 + m * scale, v1 + size.y * scale)
+                    calc_uv(pos, face.right, timer, weather)
                 );
             }
         }