add particles lighting

src/graphics/render/Emitter.cpp

@@ -39,11 +39,14 @@ void Emitter::update(float delta, std::vector<Particle>& particles) {
         // spawn particle
         Particle particle = prototype;
         particle.emitter = this;
+        particle.random = rand();
         particle.position = position;
         particle.velocity += glm::ballRand(1.0f) * explosion;
         particles.push_back(std::move(particle));
         timer -= spawnInterval;
-        count--;
+        if (count > 0) {
+            count--;
+        }
     }
 }
 

src/graphics/render/Emitter.hpp

@@ -14,6 +14,7 @@ struct Particle {
     /// @brief Pointer used to access common behaviour.
     /// Emitter must be utilized after all related particles despawn.
     Emitter* emitter;
+    int random;
     /// @brief Global position
     glm::vec3 position;
     /// @brief Linear velocity
@@ -28,6 +29,7 @@ class Texture;
 
 struct ParticleBehaviour {
     bool collision = true;
+    bool lighting = true;
     glm::vec3 gravity {0.0f, -16.0f, 0.0f};
 };
 

src/graphics/render/MainBatch.cpp

@@ -3,6 +3,8 @@
 #include "graphics/core/Texture.hpp"
 #include "graphics/core/Mesh.hpp"
 #include "graphics/core/ImageData.hpp"
+#include "voxels/Chunks.hpp"
+#include "voxels/Chunk.hpp"
 
 static const vattr attrs[] = {
     {3}, {2}, {3}, {1}, {0}
@@ -62,3 +64,19 @@ void MainBatch::prepare(int vertices) {
         flush();
     }
 }
+
+glm::vec4 MainBatch::sampleLight(
+    const glm::vec3& pos, const Chunks& chunks, bool backlight
+) {
+    light_t light = chunks.getLight(
+        std::floor(pos.x), 
+        std::floor(std::min(CHUNK_H-1.0f, pos.y)), 
+        std::floor(pos.z));
+    light_t minIntensity = backlight ? 1 : 0;
+    return glm::vec4(
+        glm::max(Lightmap::extract(light, 0), minIntensity) / 15.0f,
+        glm::max(Lightmap::extract(light, 1), minIntensity) / 15.0f,
+        glm::max(Lightmap::extract(light, 2), minIntensity) / 15.0f,
+        glm::max(Lightmap::extract(light, 3), minIntensity) / 15.0f
+    );
+}

src/graphics/render/MainBatch.hpp

@@ -9,6 +9,7 @@
 
 class Mesh;
 class Texture;
+class Chunks;
 
 class MainBatch {
     std::unique_ptr<float[]> const buffer;
@@ -36,6 +37,10 @@ public:
     void setTexture(const Texture* texture, const UVRegion& region);
     void flush();
 
+    static glm::vec4 sampleLight(
+        const glm::vec3& pos, const Chunks& chunks, bool backlight
+    );
+
     inline void vertex(
         const glm::vec3& pos,
         const glm::vec2& uv,

src/graphics/render/ModelBatch.cpp

@@ -65,17 +65,7 @@ void ModelBatch::draw(const model::Mesh& mesh, const glm::mat4& matrix,
                       bool backlight) {
     glm::vec3 gpos = matrix * glm::vec4(0.0f, 0.0f, 0.0f, 1.0f);
     gpos += lightsOffset;
-    light_t light = chunks->getLight(
-        std::floor(gpos.x), 
-        std::floor(std::min(CHUNK_H-1.0f, gpos.y)), 
-        std::floor(gpos.z));
-    light_t minIntensity = backlight ? 1 : 0;
-    glm::vec4 lights(
-        glm::max(Lightmap::extract(light, 0), minIntensity) / 15.0f,
-        glm::max(Lightmap::extract(light, 1), minIntensity) / 15.0f,
-        glm::max(Lightmap::extract(light, 2), minIntensity) / 15.0f,
-        glm::max(Lightmap::extract(light, 3), minIntensity) / 15.0f
-    );
+    glm::vec4 lights = MainBatch::sampleLight(gpos, *chunks, backlight);
     setTexture(mesh.texture, varTextures);
     size_t vcount = mesh.vertices.size();
     const auto& vertexData = mesh.vertices.data();

src/graphics/render/ParticlesRenderer.cpp

@@ -8,16 +8,20 @@
 #include "window/Camera.hpp"
 #include "world/Level.hpp"
 #include "voxels/Chunks.hpp"
+#include "settings.hpp"
 
 size_t ParticlesRenderer::visibleParticles = 0;
 size_t ParticlesRenderer::aliveEmitters = 0;
 
-ParticlesRenderer::ParticlesRenderer(const Assets& assets, const Level& level)
-    : batch(std::make_unique<MainBatch>(1024)), level(level) {
-
-    auto region = util::get_texture_region(assets, "blocks:bazalt", "");
-    emitters.push_back(std::make_unique<Emitter>(glm::vec3(0, 100, 0), Particle {
-        nullptr, glm::vec3(), glm::vec3(), 5.0f, region.region
+ParticlesRenderer::ParticlesRenderer(
+    const Assets& assets, const Level& level, const GraphicsSettings* settings
+)
+    : batch(std::make_unique<MainBatch>(1024)),
+      level(level),
+      settings(settings) {
+    auto region = util::get_texture_region(assets, "blocks:grass_top", "");
+    emitters.push_back(std::make_unique<Emitter>(glm::vec3(0, 80, 0), Particle {
+        nullptr, 0, glm::vec3(), glm::vec3(), 5.0f, region.region
     },region.texture, 0.002f, -1));
 }
 
@@ -42,6 +46,9 @@ void ParticlesRenderer::renderParticles(const Camera& camera, float delta) {
     const auto& right = camera.right;
     const auto& up = camera.up;
 
+    const auto& chunks = *level.chunks;
+    bool backlight = settings->backlight.get();
+
     std::vector<const Texture*> unusedTextures;
 
     for (auto& [texture, vec] : particles) {
@@ -57,14 +64,21 @@ void ParticlesRenderer::renderParticles(const Camera& camera, float delta) {
         while (iter != vec.end()) {
             auto& particle = *iter;
 
-            update_particle(particle, delta, *level.chunks);
+            update_particle(particle, delta, chunks);
 
+            glm::vec4 light(1, 1, 1, 0);
+            if (particle.emitter->behaviour.lighting) {
+                light = MainBatch::sampleLight(
+                    particle.position, chunks, backlight
+                );
+                light *= 0.7f + (particle.random % 300) * 0.001f;
+            }
             batch->quad(
                 particle.position,
                 right,
                 up,
                 glm::vec2(0.3f),
-                glm::vec4(1),
+                light,
                 glm::vec3(1.0f),
                 particle.region
             );

src/graphics/render/ParticlesRenderer.hpp

@@ -11,16 +11,22 @@ class Assets;
 class Camera;
 class MainBatch;
 class Level;
+struct GraphicsSettings;
 
 class ParticlesRenderer {
     const Level& level;
+    const GraphicsSettings* settings;
     std::unordered_map<const Texture*, std::vector<Particle>> particles;
     std::vector<std::unique_ptr<Emitter>> emitters;
     std::unique_ptr<MainBatch> batch;
 
     void renderParticles(const Camera& camera, float delta);
 public:
-    ParticlesRenderer(const Assets& assets, const Level& level);
+    ParticlesRenderer(
+        const Assets& assets,
+        const Level& level,
+        const GraphicsSettings* settings
+    );
     ~ParticlesRenderer();
 
     void render(const Camera& camera, float delta);

src/graphics/render/WorldRenderer.cpp

@@ -63,7 +63,9 @@ WorldRenderer::WorldRenderer(
           &engine->getSettings()
       )),
       particles(std::make_unique<ParticlesRenderer>(
-          *engine->getAssets(), *frontend->getLevel()
+          *engine->getAssets(),
+          *frontend->getLevel(),
+          &engine->getSettings().graphics
       )) {
     renderer = std::make_unique<ChunksRenderer>(
         level, frontend->getContentGfxCache(), &engine->getSettings()

src/voxels/Chunks.cpp

@@ -112,7 +112,7 @@ bool Chunks::isObstacleBlock(int32_t x, int32_t y, int32_t z) {
     return indices->blocks.get(v->id)->obstacle;  //-V522
 }
 
-ubyte Chunks::getLight(int32_t x, int32_t y, int32_t z, int channel) {
+ubyte Chunks::getLight(int32_t x, int32_t y, int32_t z, int channel) const {
     if (y < 0 || y >= CHUNK_H) {
         return 0;
     }
@@ -132,7 +132,7 @@ ubyte Chunks::getLight(int32_t x, int32_t y, int32_t z, int channel) {
     return chunk->lightmap.get(lx, y, lz, channel);
 }
 
-light_t Chunks::getLight(int32_t x, int32_t y, int32_t z) {
+light_t Chunks::getLight(int32_t x, int32_t y, int32_t z) const {
     if (y < 0 || y >= CHUNK_H) {
         return 0;
     }

src/voxels/Chunks.hpp

@@ -60,8 +60,8 @@ public:
         return get(pos.x, pos.y, pos.z);
     }
 
-    light_t getLight(int32_t x, int32_t y, int32_t z);
-    ubyte getLight(int32_t x, int32_t y, int32_t z, int channel);
+    light_t getLight(int32_t x, int32_t y, int32_t z) const;
+    ubyte getLight(int32_t x, int32_t y, int32_t z, int channel) const;
     void set(int32_t x, int32_t y, int32_t z, uint32_t id, blockstate state);
 
     /// @brief Seek for the extended block origin position