From 3235740333e36a96f8cc8618a28865405f89aa5b Mon Sep 17 00:00:00 2001
From: MihailRis <mexaruc@gmail.com>
Date: Thu, 20 Jun 2024 21:18:40 +0300
Subject: [PATCH] add actual lights

---
 src/graphics/render/ModelBatch.cpp    | 28 +++++++++++++++++++--------
 src/graphics/render/ModelBatch.hpp    | 13 +++++++------
 src/graphics/render/WorldRenderer.cpp | 12 ++++++------
 3 files changed, 33 insertions(+), 20 deletions(-)

diff --git a/src/graphics/render/ModelBatch.cpp b/src/graphics/render/ModelBatch.cpp
index e1362bb5..060776f7 100644
--- a/src/graphics/render/ModelBatch.cpp
+++ b/src/graphics/render/ModelBatch.cpp
@@ -3,6 +3,8 @@
 #include "../core/Mesh.hpp"
 #include "../core/Texture.hpp"
 #include "../../window/Window.hpp"
+#include "../../voxels/Chunks.hpp"
+#include "../../lighting/Lightmap.hpp"
 
 #define GLM_ENABLE_EXPERIMENTAL
 #include <glm/ext/matrix_transform.hpp>
@@ -20,12 +22,13 @@ inline constexpr glm::vec3 X(1, 0, 0);
 inline constexpr glm::vec3 Y(0, 1, 0);
 inline constexpr glm::vec3 Z(0, 0, 1);
 
-ModelBatch::ModelBatch(size_t capacity) 
+ModelBatch::ModelBatch(size_t capacity, Chunks* chunks)
   : buffer(std::make_unique<float[]>(capacity * VERTEX_SIZE)),
     capacity(capacity),
     index(0),
     mesh(std::make_unique<Mesh>(buffer.get(), 0, attrs)),
-    combined(1.0f)
+    combined(1.0f),
+    chunks(chunks)
 {
     ubyte pixels[] = {
         255, 255, 255, 255,
@@ -52,14 +55,23 @@ void ModelBatch::test(glm::vec3 pos, glm::vec3 size) {
 }
 
 void ModelBatch::box(glm::vec3 pos, glm::vec3 size) {
-    plane(pos+Z, X*size, Y*size, Z);
-    plane(pos-Z, -X*size, Y*size, -Z);
+    glm::vec3 gpos = combined * glm::vec4(pos, 1.0f);
+    light_t light = chunks->getLight(gpos.x, gpos.y, gpos.z);
+    glm::vec4 lights (
+        Lightmap::extract(light, 0) / 15.0f,
+        Lightmap::extract(light, 1) / 15.0f,
+        Lightmap::extract(light, 2) / 15.0f,
+        Lightmap::extract(light, 3) / 15.0f
+    );
 
-    plane(pos+Y, X*size, -Z*size, Y);
-    plane(pos-Y, X*size, Z*size, -Y);
+    plane(pos+Z, X*size, Y*size, Z, lights);
+    plane(pos-Z, -X*size, Y*size, -Z, lights);
 
-    plane(pos+X, -Z*size, Y*size, X);
-    plane(pos-X, Z*size, Y*size, -X);
+    plane(pos+Y, X*size, -Z*size, Y, lights);
+    plane(pos-Y, X*size, Z*size, -Y, lights);
+
+    plane(pos+X, -Z*size, Y*size, X, lights);
+    plane(pos-X, Z*size, Y*size, -X, lights);
 }
 
 void ModelBatch::flush() {
diff --git a/src/graphics/render/ModelBatch.hpp b/src/graphics/render/ModelBatch.hpp
index 26b8c601..b90811ea 100644
--- a/src/graphics/render/ModelBatch.hpp
+++ b/src/graphics/render/ModelBatch.hpp
@@ -7,6 +7,7 @@
 
 class Mesh;
 class Texture;
+class Chunks;
 
 struct DecomposedMat4 {
     glm::vec3 scale;
@@ -29,6 +30,8 @@ class ModelBatch {
 
     DecomposedMat4 decomposed {};
 
+    Chunks* chunks;
+
     static inline glm::vec3 SUN_VECTOR {0.411934f, 0.863868f, -0.279161f};
 
     inline void vertex(
@@ -55,15 +58,13 @@ class ModelBatch {
         buffer[index++] = compressed.floating;
     }
 
-    inline void plane(glm::vec3 pos, glm::vec3 right, glm::vec3 up, glm::vec3 norm) {
+    inline void plane(glm::vec3 pos, glm::vec3 right, glm::vec3 up, glm::vec3 norm, glm::vec4 light) {
         norm = decomposed.rotation * norm;
         float d = glm::dot(norm, SUN_VECTOR);
         d = 0.8f + d * 0.2f;
         
-        glm::vec4 color {d, d, d, 0.0f};
-        color.r = glm::max(0.0f, color.r);
-        color.g = glm::max(0.0f, color.g);
-        color.b = glm::max(0.0f, color.b);
+        glm::vec4 color {d, d, d, 1.0f};
+        color *= light;
 
         vertex(pos-right-up, {0,0}, color);
         vertex(pos+right-up, {1,0}, color);
@@ -74,7 +75,7 @@ class ModelBatch {
         vertex(pos-right+up, {0,1}, color);
     }
 public:
-    ModelBatch(size_t capacity);
+    ModelBatch(size_t capacity, Chunks* chunks);
     ~ModelBatch();
 
     void pushMatrix(glm::mat4 matrix);
diff --git a/src/graphics/render/WorldRenderer.cpp b/src/graphics/render/WorldRenderer.cpp
index 4b678dcb..f27e9040 100644
--- a/src/graphics/render/WorldRenderer.cpp
+++ b/src/graphics/render/WorldRenderer.cpp
@@ -44,12 +44,12 @@
 bool WorldRenderer::showChunkBorders = false;
 
 WorldRenderer::WorldRenderer(Engine* engine, LevelFrontend* frontend, Player* player) 
-    : engine(engine), 
-      level(frontend->getLevel()),
-      player(player),
-      frustumCulling(std::make_unique<Frustum>()),
-      lineBatch(std::make_unique<LineBatch>()),
-      modelBatch(std::make_unique<ModelBatch>(1000))
+  : engine(engine), 
+    level(frontend->getLevel()),
+    player(player),
+    frustumCulling(std::make_unique<Frustum>()),
+    lineBatch(std::make_unique<LineBatch>()),
+    modelBatch(std::make_unique<ModelBatch>(1000, level->chunks.get()))
 {
     renderer = std::make_unique<ChunksRenderer>(
         level,