feat: vox_loader normals and new voxels shader (#3843)

src/external/vox_loader.h

@@ -123,6 +123,7 @@ typedef struct {
 
     // Arrays for mesh build
     ArrayVector3 vertices;
+	ArrayVector3 normals;
     ArrayUShort indices;
     ArrayColor colors;
 
@@ -292,6 +293,16 @@ const VoxVector3 SolidVertex[] = {
 	{1, 1, 1}    //7
  };
 
+const VoxVector3 FacesPerSideNormal[] = {
+	{ -1, 0, 0 }, //-X
+	{1, 0, 0 },   //+X
+	{0,-1, 0},    //-Y
+	{0, 1, 0},    //+Y
+	{0, 0, -1},   //-Z
+	{0, 0,  1},  //+Z
+};
+
+
 // Allocated VoxArray3D size
 static void Vox_AllocArray(VoxArray3D* pvoxarray, int _sx, int _sy, int _sz)
 {
@@ -508,6 +519,11 @@ static void Vox_Build_Voxel(VoxArray3D* pvoxArray, int x, int y, int z, int matI
 		insertArrayVector3(&pvoxArray->vertices, vertComputed[v2]);
 		insertArrayVector3(&pvoxArray->vertices, vertComputed[v3]);
 
+		insertArrayVector3(&pvoxArray->normals, FacesPerSideNormal[i]);
+		insertArrayVector3(&pvoxArray->normals, FacesPerSideNormal[i]);
+		insertArrayVector3(&pvoxArray->normals, FacesPerSideNormal[i]);
+		insertArrayVector3(&pvoxArray->normals, FacesPerSideNormal[i]);
+
 		VoxColor col = pvoxArray->palette[matID];
 
 		insertArrayColor(&pvoxArray->colors, col);
@@ -653,6 +669,7 @@ int Vox_LoadFromMemory(unsigned char* pvoxData, unsigned int voxDataSize, VoxArr
 
 	// Init Arrays
 	initArrayVector3(&pvoxarray->vertices, 3 * 1024);
+	initArrayVector3(&pvoxarray->normals, 3 * 1024);
 	initArrayUShort(&pvoxarray->indices, 3 * 1024);
 	initArrayColor(&pvoxarray->colors, 3 * 1024);
 

src/rmodels.c

@@ -5641,6 +5641,7 @@ static Model LoadVOX(const char *fileName)
 
     // 6*4 = 12 vertices per voxel
     Vector3 *pvertices = (Vector3 *)voxarray.vertices.array;
+    Vector3* pnormals = (Vector3*)voxarray.normals.array;
     Color *pcolors = (Color *)voxarray.colors.array;
 
     unsigned short *pindices = voxarray.indices.array;    // 5461*6*6 = 196596 indices max per mesh
@@ -5659,6 +5660,10 @@ static Model LoadVOX(const char *fileName)
         pmesh->vertices = RL_MALLOC(size);
         memcpy(pmesh->vertices, pvertices, size);
 
+        // Copy normals
+        pmesh->normals = RL_MALLOC(size); //Rk. size as vertices
+        memcpy(pmesh->normals, pnormals, size);
+
         // Copy indices
         size = voxarray.indices.used*sizeof(unsigned short);
         pmesh->indices = RL_MALLOC(size);
@@ -5676,6 +5681,7 @@ static Model LoadVOX(const char *fileName)
 
         verticesRemain -= verticesMax;
         pvertices += verticesMax;
+        pnormals += verticesMax;
         pcolors += verticesMax;
     }