Vehicle deform

CMakeLists.txt

@@ -27,6 +27,8 @@ set(COMMON_SOURCES
     "src/collision/trianglemesh.cpp"
     "src/game/character_anim_state.hpp"
     "src/game/character_anim_state.cpp"
+    "src/game/deform_grid.hpp"
+    "src/game/deform_grid.cpp"
     "src/game/player_input.hpp"
     "src/game/simple_entity_sync.hpp"
     "src/game/skeletoninstance.hpp"
@@ -90,6 +92,8 @@ set(CLIENT_ONLY_SOURCES
     "src/gameview/worldview.cpp"
     "src/gfx/buffer_object.cpp"
     "src/gfx/buffer_object.hpp"
+    "src/gfx/deform_texture.hpp"
+    "src/gfx/deform_texture.cpp"
     "src/gfx/draw_list.hpp"
     "src/gfx/frustum.hpp"
     "src/gfx/frustum.cpp"

src/collision/object_info.hpp

@@ -21,12 +21,19 @@ enum ObjectFlag : ObjectFlags
     OF_NOTIFY_CONTACT = 0x02,
 };
 
+struct ContactInfo
+{
+    glm::vec3 pos;
+    glm::vec3 normal;
+    float impulse;
+};
+
 class ObjectCallback
 {
 public:
     ObjectCallback() = default;
 
-    virtual void OnContact(float impulse) {}
+    virtual void OnContact(const ContactInfo& info) {}
 
     virtual ~ObjectCallback() = default;
 };

src/game/deform_grid.cpp

@@ -0,0 +1,46 @@
+#include "deform_grid.hpp"
+
+game::DeformGrid::DeformGrid(const gfx::DeformGridInfo& info)
+    : info_(info), data_(info_.res.x * info_.res.y * info_.res.z, glm::i8vec3(0))
+{    
+
+}
+
+void game::DeformGrid::ApplyImpulse(const glm::vec3& pos, const glm::vec3& impulse, float radius)
+{
+    glm::vec3 step = (info_.max - info_.min) / glm::vec3(info_.res);
+
+    glm::ivec3 ipos;
+
+    // TODO: make more efficient
+    for (ipos.z = 0; ipos.z < info_.res.z; ++ipos.z)
+    {
+        for (ipos.y = 0; ipos.y < info_.res.y; ++ipos.y)
+        {
+            for (ipos.x = 0; ipos.x < info_.res.x; ++ipos.x)
+            {
+                glm::vec3 texel_pos = info_.min + glm::vec3(ipos) * step;
+
+                if (glm::distance2(pos, texel_pos) < radius * radius)
+                {
+                    size_t idx = GetTexelIndex(ipos);
+                    glm::vec3 offset = UnpackOffset(data_[idx]);
+                    offset += impulse;
+                    data_[idx] = PackOffset(offset);
+                }
+            }
+        }
+    }
+
+
+}
+
+glm::i8vec3 game::DeformGrid::PackOffset(const glm::vec3& offset)
+{
+    return glm::i8vec3(glm::round(glm::clamp(offset / info_.max_offset, -1.0f, 1.0f) * 127.0f));
+}
+
+glm::vec3 game::DeformGrid::UnpackOffset(const glm::i8vec3& packed)
+{
+    return glm::clamp(glm::vec3(packed) * 0.0078740157480315f, -1.0f, 1.0f) * info_.max_offset;
+}

src/game/deform_grid.hpp

@@ -0,0 +1,41 @@
+#pragma once
+
+#include <vector>
+#include <span>
+
+#define GLM_ENABLE_EXPERIMENTAL
+#include <glm/glm.hpp>
+#include <glm/gtx/norm.hpp>
+
+#include "gfx/deform_grid_info.hpp"
+
+namespace game
+{
+
+class DeformGrid
+{
+public:
+    DeformGrid(const gfx::DeformGridInfo& info);
+
+    void ApplyImpulse(const glm::vec3& pos, const glm::vec3& impulse, float radius);
+
+    const gfx::DeformGridInfo& GetInfo() const { return info_; }
+
+    std::span<glm::i8vec3> GetData() { return data_; }
+    std::span<const glm::i8vec3> GetData() const { return data_; }
+
+private:
+    glm::i8vec3 PackOffset(const glm::vec3& offset);
+    glm::vec3 UnpackOffset(const glm::i8vec3& packed);
+
+    size_t GetTexelIndex(const glm::ivec3& pos) const { return static_cast<size_t>(pos.x + (pos.y + pos.z * info_.res.y) * info_.res.x); }
+
+private:
+    const gfx::DeformGridInfo info_;
+    std::vector<glm::i8vec3> data_;
+
+};
+
+
+
+}

src/game/openworld.cpp

@@ -47,12 +47,12 @@ game::OpenWorld::OpenWorld() : World("openworld")
         SpawnBot();
     }
 
-    auto& veh = Spawn<game::DrivableVehicle>("twingo", glm::vec3{0.8f, 0.1f, 0.1f});
+    auto& veh = Spawn<game::DrivableVehicle>("twingo", glm::vec3{1.0f, 0.8f, 0.1f});
     veh.SetPosition({110.0f, 100.0f, 5.0f});
 
     constexpr size_t in_row = 20;
 
-    for (size_t i = 0; i < 3000; ++i)
+    for (size_t i = 0; i < 1500; ++i)
     {
         Schedule(i * 40, [this, i] {
             size_t col = i % in_row;

src/game/vehicle.cpp

@@ -95,6 +95,14 @@ game::Vehicle::Vehicle(World& world, std::string model_name, const glm::vec3& co
     bt_world.addRigidBody(body_.get(), btBroadphaseProxy::DefaultFilter, btBroadphaseProxy::AllFilter);
     bt_world.addAction(vehicle_.get());
 
+    // init deform
+    gfx::DeformGridInfo info{};
+    info.min = glm::vec3(-1.0f, -2.5f, 0.10f);
+    info.max = glm::vec3(1.0f, 2.0f, 1.8f);
+    info.res = glm::ivec3(8, 16, 8);
+    info.max_offset = 0.1f;
+    deformgrid_ = std::make_unique<DeformGrid>(info);
+
     Update();
 }
 
@@ -127,20 +135,22 @@ void game::Vehicle::SendInitData(Player& player, net::OutMessage& msg) const
     size_t fields_pos = msg.Reserve<VehicleSyncFieldFlags>();
     auto fields = WriteState(msg, default_state);
     msg.WriteAt(fields_pos, fields);
+
+    WriteDeformSync(msg);
 }
 
-void game::Vehicle::OnContact(float impulse)
+void game::Vehicle::OnContact(const collision::ContactInfo& info)
 {
-    Super::OnContact(impulse);
+    Super::OnContact(info);
 
-    crash_intensity_ += impulse;
+    crash_intensity_ += info.impulse;
 
-    if (impulse < 1000.0f)
+    if (info.impulse < 1000.0f)
         return;
 
     if (window_health_ > 0.0f)
     {
-        window_health_ -= impulse;
+        window_health_ -= info.impulse;
 
         if (window_health_ <= 0.0f) // just broken
         {
@@ -148,6 +158,11 @@ void game::Vehicle::OnContact(float impulse)
         }
     }
 
+    if (window_health_ <= 0.0f)
+    {
+        Deform(info.pos, -glm::normalize(info.normal) * 0.1f, 1.0f);
+    }
+
 }
 
 void game::Vehicle::SetInput(VehicleInputType type, bool enable)
@@ -485,3 +500,56 @@ void game::Vehicle::SendUpdateMsg()
 
     msg.WriteAt(fields_pos, fields);
 }
+
+void game::Vehicle::WriteDeformSync(net::OutMessage& msg) const
+{
+    const auto texels = deformgrid_->GetData();
+
+    auto numtexels_pos = msg.Reserve<net::NumTexels>();
+    net::NumTexels numtexels = 0;
+
+    size_t last = 0;
+
+    for (size_t i = 0; i < texels.size(); ++i)
+    {
+        if (texels[i] == glm::i8vec3(0))
+            continue; // unchanged, no write
+
+        auto diff = i - last;
+        msg.WriteVarInt(diff);
+
+        for (size_t j = 0; j < 3; ++j)
+        {
+            msg.Write(texels[i][j]);
+        }
+
+        last = i;
+        ++numtexels;
+    }
+
+    msg.WriteAt(numtexels_pos, numtexels);
+}
+
+void game::Vehicle::Deform(const glm::vec3& pos, const glm::vec3& deform, float radius)
+{
+    net::PositionQ pos_q;
+    net::PositionQ deform_q;
+    net::EncodePosition(pos, pos_q);
+    net::EncodePosition(deform, deform_q);
+    
+    SendDeformMsg(pos_q, deform_q);
+
+    // defeorm locally
+    glm::vec3 new_pos, new_deform;
+    net::DecodePosition(pos_q, new_pos);
+    net::DecodePosition(deform_q, new_deform);
+
+    deformgrid_->ApplyImpulse(new_pos, new_deform, 0.3f);
+}
+
+void game::Vehicle::SendDeformMsg(const net::PositionQ& pos, const net::PositionQ& deform)
+{
+    auto msg = BeginEntMsg(net::EMSG_DEFORM);
+    net::WritePositionQ(msg, pos);
+    net::WritePositionQ(msg, deform);
+}

src/game/vehicle.hpp

@@ -9,6 +9,7 @@
 #include "entity.hpp"
 #include "world.hpp"
 #include "vehicle_sync.hpp"
+#include "deform_grid.hpp"
 
 namespace game
 {
@@ -41,7 +42,7 @@ public:
     virtual void Update() override;
     virtual void SendInitData(Player& player, net::OutMessage& msg) const override;
 
-    virtual void OnContact(float impulse) override;
+    virtual void OnContact(const collision::ContactInfo& info) override;
 
     void SetInput(VehicleInputType type, bool enable);
     void SetInputs(VehicleInputFlags inputs) { in_ = inputs; }
@@ -65,9 +66,14 @@ private:
     void UpdateCrash();
     void UpdateWheels();
     void UpdateSyncState();
+    
     VehicleSyncFieldFlags WriteState(net::OutMessage& msg, const VehicleSyncState& base) const;
     void SendUpdateMsg();
 
+    void WriteDeformSync(net::OutMessage& msg) const;
+    void Deform(const glm::vec3& pos, const glm::vec3& deform, float radius);
+    void SendDeformMsg(const net::PositionQ& pos, const net::PositionQ& deform);
+
 private:
     std::string model_name_;
     std::shared_ptr<const assets::VehicleModel> model_;
@@ -95,6 +101,8 @@ private:
 
     float crash_intensity_ = 0.0f;
     size_t no_crash_frames_ = 0;
+
+    std::unique_ptr<DeformGrid> deformgrid_;
 };
 
 } // namespace game

src/game/world.cpp

@@ -105,7 +105,7 @@ void game::World::HandleContacts()
     static std::vector<net::ObjNum> to_destroy;
     to_destroy.clear();
 
-    auto ProcessContact = [&](btRigidBody* body, btRigidBody* other_body, btManifoldPoint& pt) {
+    auto ProcessContact = [&](btRigidBody* body, btRigidBody* other_body, const btVector3& pos, const btVector3& normal, float impulse) {
         collision::ObjectType type;
         collision::ObjectFlags flags;
         collision::ObjectCallback* cb;
@@ -113,7 +113,11 @@ void game::World::HandleContacts()
 
         if (cb && (flags & collision::OF_NOTIFY_CONTACT))
         {
-            cb->OnContact(pt.getAppliedImpulse());
+            collision::ContactInfo info;
+            info.pos = glm::vec3(pos.x(), pos.y(), pos.z());
+            info.normal = glm::vec3(normal.x(), normal.y(), normal.z());
+            info.impulse = impulse;
+            cb->OnContact(info);
         }
 
         if (type == collision::OT_MAP_OBJECT && (flags & collision::OF_DESTRUCTIBLE))
@@ -122,10 +126,10 @@ void game::World::HandleContacts()
             if (!col)
                 return;
                            
-            if (pt.getAppliedImpulse() > col->GetDestroyThreshold())
+            if (impulse > col->GetDestroyThreshold())
             {
                 to_destroy.push_back(col->GetNum());
-                other_body->applyCentralImpulse(pt.m_normalWorldOnB * pt.getAppliedImpulse() * 0.5f);        
+                other_body->applyCentralImpulse(-normal * impulse * 0.5f);        
             }
 
             return;
@@ -143,8 +147,8 @@ void game::World::HandleContacts()
         for (int j = 0; j < contactManifold->getNumContacts(); j++)
         {
             btManifoldPoint& pt = contactManifold->getContactPoint(j);
-            ProcessContact(body0, body1, pt);
+            ProcessContact(body0, body1, pt.m_localPointA, -pt.m_normalWorldOnB, pt.getAppliedImpulse());
-            ProcessContact(body1, body0, pt);
+            ProcessContact(body1, body0, pt.m_localPointB, pt.m_normalWorldOnB, pt.getAppliedImpulse());
         }
     }
 

src/gameview/vehicleview.cpp

@@ -3,8 +3,10 @@
 #include "assets/cache.hpp"
 #include "net/utils.hpp"
 #include "worldview.hpp"
+#include "utils/random.hpp"
 
 #include <iostream>
+#include <ranges>
 
 game::view::VehicleView::VehicleView(WorldView& world, net::InMessage& msg)
     : EntityView(world, msg)
@@ -16,6 +18,7 @@ game::view::VehicleView::VehicleView(WorldView& world, net::InMessage& msg)
 
     model_ = assets::CacheManager::GetVehicleModel("data/" + std::string(modelname) + ".veh");
     mesh_ = *model_->GetModel()->GetMesh();
+    InitMesh();
     
     auto& modelwheels = model_->GetWheels();
     wheels_.resize(modelwheels.size());
@@ -30,6 +33,9 @@ game::view::VehicleView::VehicleView(WorldView& world, net::InMessage& msg)
     if (!ReadState(&msg))
         throw EntityInitError();
 
+    if (!ReadDeformSync(msg))
+        throw EntityInitError();
+
     // init the other transform to identical
     root_trans_[0] = root_trans_[1];
     root_.local = root_trans_[0];
@@ -43,6 +49,8 @@ bool game::view::VehicleView::ProcessMsg(net::EntMsgType type, net::InMessage& m
 {
     switch (type)
     {
+    case net::EMSG_DEFORM:
+        return ProcessDeformMsg(msg);
     default:
         return Super::ProcessMsg(type, msg);
     }
@@ -141,6 +149,44 @@ void game::view::VehicleView::Draw(const DrawArgs& args)
             args.dlist.AddSurface(cmd);
         }
     }
+
+    // temp deforms
+    for (const auto& [pos, deform] : debug_deforms_)
+    {
+        glm::vec3 start = root_.matrix * glm::vec4(pos, 1.0f);
+        glm::vec3 end = root_.matrix * glm::vec4(pos + deform, 1.0f);
+        glm::vec3 end2 = end + glm::vec3(0.0f, 0.0f, 0.1f);
+
+        args.dlist.AddBeam(start, end, 0xFFFFFF00, 0.01f);
+        args.dlist.AddBeam(end, end2, 0xFFFF00FF, 0.01f);
+    }
+}
+
+void game::view::VehicleView::InitMesh()
+{
+    gfx::DeformGridInfo info{};
+    info.min = glm::vec3(-1.0f, -2.5f, 0.10f);
+    info.max = glm::vec3(1.0f, 2.0f, 1.8f);
+    info.res = glm::ivec3(8, 16, 8);
+    info.max_offset = 0.1f;
+    deform_ = std::make_unique<VehicleDeformView>(info);
+
+    for (auto& surface : mesh_.surfaces)
+    {
+        surface.deform_tex = deform_->tex;
+        surface.sflags |= gfx::SF_DEFORM_GRID;
+    }
+
+    // for (size_t i = 0; i < 20; ++i)
+    // {
+    //     glm::vec3 pos(RandomFloat(-1.0f, 1.0f), RandomFloat(-2.0f, 2.0f), RandomFloat(0.0f, 2.0f));
+    //     glm::vec3 impulse(RandomFloat(-1.0f, 1.0f), RandomFloat(-1.0f, 1.0f), RandomFloat(-1.0f, 1.0f));
+    //     impulse *= 0.05f;
+
+    //     deform_->grid.ApplyImpulse(pos, impulse, 1.0f);
+    // }
+
+    deform_->tex->SetData(deform_->grid.GetData());
 }
 
 bool game::view::VehicleView::ReadState(net::InMessage* msg)
@@ -218,3 +264,58 @@ bool game::view::VehicleView::ReadState(net::InMessage* msg)
     }
     return true;
 }
+
+bool game::view::VehicleView::ReadDeformSync(net::InMessage& msg)
+{
+    net::NumTexels numtexels;
+    if (!msg.Read(numtexels))
+        return false;
+
+    auto texels = deform_->grid.GetData();
+    std::ranges::fill(texels, glm::i8vec3(0));
+
+    size_t current = 0;
+    for (size_t i = 0; i < numtexels; ++i)
+    {
+        int64_t diff;
+        if (!msg.ReadVarInt(diff))
+            return false;
+
+        current += static_cast<size_t>(diff);
+
+        if (current >= texels.size())
+            return false;
+
+        auto& texel = texels[current];
+        for (size_t j = 0; j < 3; ++j)
+        {
+            if (!msg.Read(texel[j]))
+                return false;
+        }
+    }
+
+    deform_->tex->SetData(deform_->grid.GetData());
+
+    return true;
+}
+
+bool game::view::VehicleView::ProcessDeformMsg(net::InMessage& msg)
+{
+    net::PositionQ pos_q, deform_q;
+    if (!net::ReadPositionQ(msg, pos_q) || !net::ReadPositionQ(msg, deform_q))
+        return false;
+
+
+    glm::vec3 pos, deform;
+    net::DecodePosition(pos_q, pos);
+    net::DecodePosition(deform_q, deform);
+
+    deform_->grid.ApplyImpulse(pos, deform, 0.3f);
+    deform_->tex->SetData(deform_->grid.GetData());
+
+    //debug_deforms_.emplace_back(std::make_tuple(pos, deform));
+
+    return true;
+
+
+}

src/gameview/vehicleview.hpp

@@ -4,6 +4,7 @@
 
 #include "assets/vehiclemdl.hpp"
 #include "game/vehicle_sync.hpp"
+#include "game/deform_grid.hpp"
 
 #include <chrono>
 
@@ -19,6 +20,14 @@ struct VehicleWheelViewInfo
     float rotation = 0.0f;
 };
 
+struct VehicleDeformView
+{
+    DeformGrid grid;
+    std::shared_ptr<gfx::DeformTexture> tex;
+
+    VehicleDeformView(const gfx::DeformGridInfo& info) : grid(info), tex(std::make_shared<gfx::DeformTexture>(info)) {}
+};
+
 class VehicleView : public EntityView
 {
     using Super = EntityView;
@@ -32,8 +41,13 @@ public:
     virtual void Draw(const DrawArgs& args) override;
 
 private:
+    void InitMesh();
+
     bool ReadState(net::InMessage* msg);
 
+    bool ReadDeformSync(net::InMessage& msg);
+    bool ProcessDeformMsg(net::InMessage& msg);
+
 private:
     std::shared_ptr<const assets::VehicleModel> model_;
     assets::Mesh mesh_;
@@ -51,6 +65,8 @@ private:
     audio::SoundSource* snd_accel_src_ = nullptr;
 
     bool windows_broken_ = false;
+    std::unique_ptr<VehicleDeformView> deform_;
+    std::vector<std::tuple<glm::vec3, glm::vec3>> debug_deforms_;
 };
 
 }

src/gfx/deform_grid_info.hpp

@@ -0,0 +1,17 @@
+#pragma once
+
+#include <glm/glm.hpp>
+
+namespace gfx
+{
+
+struct DeformGridInfo
+{
+    glm::vec3 min;
+    glm::vec3 max;
+    glm::ivec3 res;
+    float max_offset;
+};
+
+
+}

src/gfx/deform_texture.cpp

@@ -0,0 +1,32 @@
+#include "deform_texture.hpp"
+
+#include <stdexcept>
+
+gfx::DeformTexture::DeformTexture(const DeformGridInfo& info) : info_(info)
+{
+    glGenTextures(1, &id_);
+
+    if (!id_)
+        throw std::runtime_error("Nelze vytvorit texturu!");
+
+    glBindTexture(GL_TEXTURE_3D, id_);
+
+    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
+
+    glBindTexture(GL_TEXTURE_3D, 0);
+}
+
+void gfx::DeformTexture::SetData(std::span<const glm::i8vec3> data)
+{
+    glBindTexture(GL_TEXTURE_3D, id_);
+    glTexImage3D(GL_TEXTURE_3D, 0, GL_RGB8_SNORM, info_.res.x, info_.res.y, info_.res.z, 0, GL_RGB, GL_BYTE, data.data());
+}
+
+gfx::DeformTexture::~DeformTexture() 
+{
+    glDeleteTextures(1, &id_);
+}

src/gfx/deform_texture.hpp

@@ -0,0 +1,34 @@
+#pragma once
+
+#include <span>
+#include <glm/glm.hpp>
+#include "client/gl.hpp"
+#include "utils/defs.hpp"
+#include "deform_grid_info.hpp"
+
+namespace gfx
+{
+
+class DeformTexture
+{
+public:
+    DeformTexture(const DeformGridInfo& info);
+    DELETE_COPY_MOVE(DeformTexture)
+
+    void SetData(std::span<const glm::i8vec3> data);
+
+    const DeformGridInfo& GetInfo() const { return info_; }
+    GLuint GetId() const { return id_; }
+
+    ~DeformTexture();
+
+private:
+    const DeformGridInfo info_;
+    GLuint id_;
+
+};
+
+
+
+
+}

src/gfx/renderer.cpp

@@ -16,6 +16,7 @@ gfx::Renderer::Renderer()
 {
     ShaderSources::MakeShader(mesh_shader_.shader, SS_MESH_VERT, SS_MESH_FRAG);
     ShaderSources::MakeShader(skel_mesh_shader_.shader, SS_SKEL_MESH_VERT, SS_SKEL_MESH_FRAG);
+    ShaderSources::MakeShader(deform_mesh_shader_.shader, SS_DEFORM_MESH_VERT, SS_DEFORM_MESH_FRAG);
     ShaderSources::MakeShader(solid_shader_, SS_SOLID_VERT, SS_SOLID_FRAG);
     ShaderSources::MakeShader(hud_shader_, SS_HUD_VERT, SS_HUD_FRAG);
     ShaderSources::MakeShader(beam_shader_, SS_BEAM_VERT, SS_BEAM_FRAG);
@@ -104,6 +105,7 @@ void gfx::Renderer::InvalidateShaders()
 {
 	InvalidateMeshShader(mesh_shader_);
 	InvalidateMeshShader(skel_mesh_shader_);
+	InvalidateMeshShader(deform_mesh_shader_);
 }
 
 void gfx::Renderer::InvalidateMeshShader(MeshShader& mshader)
@@ -171,6 +173,7 @@ void gfx::Renderer::DrawSurfaceList(std::span<DrawSurfaceCmd> list, const DrawLi
 	const gfx::Texture* last_texture = nullptr;
 	const gfx::VertexArray* last_vao = nullptr;
     const gfx::UniformBuffer<glm::mat4>* last_skin = nullptr;
+	const DeformTexture* last_deform = nullptr;
 	InvalidateShaders();
 	
 	// enable depth test
@@ -199,6 +202,7 @@ void gfx::Renderer::DrawSurfaceList(std::span<DrawSurfaceCmd> list, const DrawLi
 		const bool twosided_flag = surface->sflags & SF_2SIDED;
 		const bool blend_flag = surface->sflags & SF_BLEND;
 		const bool object_color_flag = surface->sflags & SF_OBJECT_COLOR;
+		const bool deform_flag = surface->sflags & SF_DEFORM_GRID;
 
 		// sync 2sided
 		if (last_twosided != twosided_flag)
@@ -212,7 +216,7 @@ void gfx::Renderer::DrawSurfaceList(std::span<DrawSurfaceCmd> list, const DrawLi
 		}
 
 		// select shader
-		MeshShader& mshader = skeletal_flag ? skel_mesh_shader_ : mesh_shader_;
+		MeshShader& mshader = skeletal_flag ? skel_mesh_shader_ : (deform_flag ? deform_mesh_shader_ : mesh_shader_);
 		SetupMeshShader(mshader, params);
 
 		// set model matrix
@@ -290,6 +294,7 @@ void gfx::Renderer::DrawSurfaceList(std::span<DrawSurfaceCmd> list, const DrawLi
 		if (last_texture != surface->texture.get())
 		{
 			GLuint tex_id = surface->texture ? surface->texture->GetId() : 0;
+			glActiveTexture(GL_TEXTURE0);
 			glBindTexture(GL_TEXTURE_2D, tex_id);
 			last_texture = surface->texture.get();
 		}
@@ -301,6 +306,24 @@ void gfx::Renderer::DrawSurfaceList(std::span<DrawSurfaceCmd> list, const DrawLi
             last_skin = cmd.skinning;
 		}
 		
+		// bind deform texture
+		if (deform_flag && surface->deform_tex.get() != last_deform)
+		{
+			const auto& deform_tex = *surface->deform_tex;
+			GLuint tex_id = deform_tex.GetId();
+			glActiveTexture(GL_TEXTURE1);
+			glBindTexture(GL_TEXTURE_3D, tex_id);
+			last_deform = &deform_tex;
+
+			// update deform tex info
+			const auto& deform_info = deform_tex.GetInfo();
+			glm::mat3 deform_info_mat;
+			deform_info_mat[0] = deform_info.min;
+			deform_info_mat[1] = deform_info.max;
+			deform_info_mat[2] = glm::vec3(deform_info.max_offset, 0.0f, 0.0f);
+			glUniformMatrix3fv(mshader.shader->U(SU_DEFORM_INFO), 1, GL_FALSE, &deform_info_mat[0][0]);
+		}
+
 		// bind VAO
 		if (last_vao != surface->va.get())
 		{
@@ -428,6 +451,8 @@ void gfx::Renderer::DrawHudList(std::span<DrawHudCmd> queue, const DrawListParam
 	const gfx::Texture* last_texture = nullptr;
 	const gfx::VertexArray* last_vao = nullptr;
 
+	glActiveTexture(GL_TEXTURE0);
+
 	for (const auto& cmd : queue)
 	{
 		if (!cmd.va || !cmd.texture)

src/gfx/renderer.hpp

@@ -52,6 +52,7 @@ namespace gfx
 	private:
 		MeshShader mesh_shader_;
 		MeshShader skel_mesh_shader_;
+		MeshShader deform_mesh_shader_;
 		std::unique_ptr<Shader> solid_shader_;
 
 		std::unique_ptr<BufferObject> beam_segments_vbo_;

src/gfx/shader.cpp

@@ -11,6 +11,8 @@ static const char* const s_uni_names[] = {
 	"u_color",              // SU_COLOR
     "u_flags",              // SU_FLAGS
     "u_camera",             // SU_CAMERA
+    "u_deform_tex",         // SU_DEFORM_TEX
+    "u_deform_info",        // SU_DEFORM_INFO
 };
 
 // Vytvori shader z daneho zdroje
@@ -93,6 +95,7 @@ void gfx::Shader::SetupBindings()
     glUseProgram(m_id);
     
     glUniform1i(m_uni[SU_TEX], 0);
+    glUniform1i(m_uni[SU_DEFORM_TEX], 1);
 
     // Bones UBO
 	int ubo_index = glGetUniformBlockIndex(m_id, "Bones");

src/gfx/shader.hpp

@@ -16,6 +16,8 @@ namespace gfx
 		SU_COLOR,
 		SU_FLAGS,
 		SU_CAMERA,
+		SU_DEFORM_TEX,
+		SU_DEFORM_INFO,
 	
 		SU_COUNT
 	};

src/gfx/shader_sources.cpp

@@ -212,6 +212,76 @@ void main() {
 
 )GLSL",
 
+// SS_DEFORM_MESH_VERT
+SHADER_HEADER
+R"GLSL(
+layout (location = 0) in vec3 a_pos;
+layout (location = 1) in vec3 a_normal;
+layout (location = 2) in vec4 a_color;
+layout (location = 3) in vec2 a_uv;
+
+)GLSL"
+MESH_MATRICES_GLSL
+LIGHT_MATRICES_GLSL
+COMPUTE_LIGHTS_GLSL
+R"GLSL(
+
+uniform sampler3D u_deform_tex;
+uniform mat3 u_deform_info;
+
+out vec2 v_uv;
+out vec3 v_color;
+
+void main() {
+    vec3 deform_pos = (a_pos - u_deform_info[0]) / (u_deform_info[1] - u_deform_info[0]);
+    vec3 pos = a_pos + texture(u_deform_tex, deform_pos).xyz * u_deform_info[2].x;
+    //vec3 pos = a_pos + u_deform_info[0] * u_deform_info[2].x;
+    //vec3 pos = a_pos + vec3(0.0, 0.0, 1.0);
+
+    vec4 world_pos = u_model * vec4(pos, 1.0);
+    vec3 world_normal = normalize(mat3(u_model) * a_normal);
+    gl_Position = u_view_proj * world_pos;
+
+    v_uv = a_uv;
+    v_color = ComputeLights(world_pos.xyz, world_normal) * a_color.rgb;
+}	
+)GLSL",
+
+// SS_DEFORM_MESH_FRAG
+SHADER_HEADER
+R"GLSL(
+in vec2 v_uv;
+in vec3 v_color;
+
+#define SHF_CULL_ALPHA 1
+#define SHF_BACKGROUND 2
+
+uniform sampler2D u_tex;
+uniform vec4 u_color;
+uniform int u_flags;
+
+layout (location = 0) out vec4 o_color;
+
+void main() {
+    o_color = vec4(texture(u_tex, v_uv));
+    
+    if ((u_flags & SHF_CULL_ALPHA) > 0)
+    {
+        if (o_color.a < 0.5)
+            discard;
+    }
+    else if ((u_flags & SHF_BACKGROUND) > 0)
+    {
+        // blend with bg
+        o_color = mix(u_color, o_color, o_color.a);
+    }
+    
+    o_color.rgb *= v_color; // Apply vertex color
+    //o_color = vec4(1.0, 0.0, 0.0, 1.0);
+}	
+
+)GLSL",
+
 // SS_SOLID_VERT
 SHADER_HEADER
 R"GLSL(

src/gfx/shader_sources.hpp

@@ -13,6 +13,9 @@ namespace gfx
 		SS_SKEL_MESH_VERT,
 		SS_SKEL_MESH_FRAG,
 
+		SS_DEFORM_MESH_VERT,
+		SS_DEFORM_MESH_FRAG,
+
 		SS_SOLID_VERT,
 		SS_SOLID_FRAG,
 

src/gfx/surface.hpp

@@ -2,6 +2,7 @@
 
 #include "texture.hpp"
 #include "vertex_array.hpp"
+#include "deform_texture.hpp"
 
 namespace gfx
 {
@@ -24,16 +25,18 @@ enum SurfaceFlag : SurfaceFlags
     SF_BLEND = 0x02,          // enable blending, disable depth write
     SF_BLEND_ADDITIVE = 0x04, // use additive blending instead of opacity
     SF_OBJECT_COLOR = 0x08,   // use object color for background instead of alpha culling
+    SF_DEFORM_GRID = 0x10,    // use deform grid
 };
 
 struct Surface
 {
-    std::shared_ptr<const gfx::Texture> texture;
+    std::shared_ptr<const Texture> texture;
-    std::shared_ptr<const gfx::VertexArray> va;
+    std::shared_ptr<const VertexArray> va;
     size_t first = 0; // first triangle VA EBO
     size_t count = 0; // number of triangles
     MeshFlags mflags = MF_NONE;
     SurfaceFlags sflags = SF_NONE;
+    std::shared_ptr<const DeformTexture> deform_tex;
 };
 
 } // namespace gfx

src/net/defs.hpp

@@ -90,6 +90,7 @@ enum EntMsgType : uint8_t
     EMSG_ATTACH,
     // EMSG_UPDATE, // deprecated
     EMSG_PLAYSOUND,
+    EMSG_DEFORM,
 };
 
 using PositionElemQ = Quantized<uint32_t, -10000, 10000, 1>;
@@ -128,4 +129,6 @@ using ClothesName = FixedStr<32>;
 using ObjNum = uint16_t;
 using ObjCount = ObjNum;
 
+using NumTexels = uint16_t;
+
 } // namespace net