avoid zero vertex draw calls

[blank.git] / src / world / chunk.cpp

diff --git a/src/world/chunk.cpp b/src/world/chunk.cpp
index 1d120bb2ebe8d2475a4be2ac1bc4799755b8d25d..596bcaf08985765f4a0f96aa928c4cef3d040e94 100644 (file)
--- a/src/world/chunk.cpp
+++ b/src/world/chunk.cpp
@@ -19,6 +19,9 @@
 #include <ostream>
 #include <queue>
 
+#include <iostream>
+#include <glm/gtx/io.hpp>
+
 
 namespace blank {
 
@@ -29,6 +32,7 @@ constexpr int Chunk::size;
 Chunk::Chunk(const BlockTypeRegistry &types) noexcept
 : types(&types)
 , neighbor{0}
+, gravity()
 , blocks{}
 , light{0}
 , generated(false)
@@ -42,6 +46,7 @@ Chunk::Chunk(const BlockTypeRegistry &types) noexcept
 
 Chunk::Chunk(Chunk &&other) noexcept
 : types(other.types)
+, gravity(std::move(other.gravity))
 , generated(other.generated)
 , lighted(other.lighted)
 , position(other.position)
@@ -57,6 +62,7 @@ Chunk::Chunk(Chunk &&other) noexcept
 Chunk &Chunk::operator =(Chunk &&other) noexcept {
        types = other.types;
        std::copy(other.neighbor, other.neighbor + sizeof(neighbor), neighbor);
+       gravity = std::move(other.gravity);
        std::copy(other.blocks, other.blocks + sizeof(blocks), blocks);
        std::copy(other.light, other.light + sizeof(light), light);
        generated = other.generated;
@@ -174,6 +180,12 @@ void Chunk::SetBlock(int index, const Block &block) noexcept {
        blocks[index] = block;
        Invalidate();
 
+       if (old_type.gravity && !new_type.gravity) {
+               gravity.erase(index);
+       } else if (new_type.gravity && !old_type.gravity) {
+               gravity.insert(index);
+       }
+
        if (!lighted || &old_type == &new_type) return;
 
        if (new_type.luminosity > old_type.luminosity) {
@@ -233,6 +245,15 @@ void Chunk::ScanLights() {
        lighted = true;
 }
 
+void Chunk::ScanActive() {
+       gravity.clear();
+       for (int index = 0; index < size; ++index) {
+               if (Type(index).gravity) {
+                       gravity.insert(gravity.end(), index);
+               }
+       }
+}
+
 void Chunk::SetNeighbor(Block::Face face, Chunk &other) noexcept {
        neighbor[face] = &other;
        other.neighbor[Block::Opposite(face)] = this;
@@ -349,6 +370,20 @@ float Chunk::GetVertexLight(const RoughLocation::Fine &pos, const BlockMesh::Pos
 }
 
 
+glm::vec3 Chunk::GravityAt(const ExactLocation &coords) const noexcept {
+       glm::vec3 grav(0.0f);
+       for (int index : gravity) {
+               RoughLocation::Fine block_pos(ToPos(index));
+               ExactLocation block_coords(position, ToCoords(block_pos));
+               // trust that block type hasn't changed
+               grav += Type(index).gravity->GetGravity(
+                       coords.Difference(block_coords).Absolute(),
+                       ToTransform(block_pos, index));
+       }
+       return grav;
+}
+
+
 bool Chunk::IsSurface(const RoughLocation::Fine &pos) const noexcept {
        const Block &block = BlockAt(pos);
        if (!Type(block).visible) {
@@ -777,17 +812,22 @@ void ChunkRenderer::Render(Viewport &viewport) {
        chunk_prog.SetTexture(block_tex);
        chunk_prog.SetFogDensity(fog_density);
 
+       Frustum frustum(transpose(chunk_prog.GetVP()));
+       AABB box;
+
        for (int i = 0; i < index.TotalChunks(); ++i) {
                if (!index[i]) continue;
-               // TODO: optimize chunk culling, shoudn't be that hard
-               glm::mat4 m(index[i]->Transform(index.Base()));
-               glm::mat4 mvp(chunk_prog.GetVP() * m);
-               if (!CullTest(Chunk::Bounds(), mvp)) {
+               box.min = (index[i]->Position() - index.Base()) * ExactLocation::Extent();
+               box.max = box.min + ExactLocation::FExtent();
+
+               if (!CullTest(box, frustum)) {
                        if (index[i]->ShouldUpdateMesh()) {
                                index[i]->Update(models[i]);
                        }
-                       chunk_prog.SetM(m);
-                       models[i].Draw();
+                       if (!models[i].Empty()) {
+                               chunk_prog.SetM(index[i]->Transform(index.Base()));
+                               models[i].Draw();
+                       }
                }
        }
 }
@@ -1043,7 +1083,7 @@ ChunkIndex *ChunkStore::ClosestIndex(const ExactLocation::Coarse &pos) {
        return closest_index;
 }
 
-Chunk *ChunkStore::Get(const ExactLocation::Coarse &pos) {
+Chunk *ChunkStore::Get(const ExactLocation::Coarse &pos) noexcept {
        for (ChunkIndex &index : indices) {
                Chunk *chunk = index.Get(pos);
                if (chunk) {
@@ -1053,6 +1093,16 @@ Chunk *ChunkStore::Get(const ExactLocation::Coarse &pos) {
        return nullptr;
 }
 
+const Chunk *ChunkStore::Get(const ExactLocation::Coarse &pos) const noexcept {
+       for (const ChunkIndex &index : indices) {
+               const Chunk *chunk = index.Get(pos);
+               if (chunk) {
+                       return chunk;
+               }
+       }
+       return nullptr;
+}
+
 Chunk *ChunkStore::Allocate(const ExactLocation::Coarse &pos) {
        Chunk *chunk = Get(pos);
        if (chunk) {