Added shadow renderer and removed rendering modes

src/graphics/core/device.h

@@ -52,6 +52,7 @@ namespace Gfx
 class CFramebuffer;
 class CUIRenderer;
 class CTerrainRenderer;
+class CShadowRenderer;
 struct FramebufferParams;
 struct Light;
 struct Material;
@@ -169,16 +170,6 @@ enum RenderState
     RENDER_STATE_SHADOW_MAPPING,
 };
 
-/**
-* \enum RenderMode
-* \brief Render modes the graphics device can be in
-*/
-enum RenderMode
-{
-    RENDER_MODE_NORMAL,
-    RENDER_MODE_SHADOW,
-};
-
 /**
  * \enum CompFunc
  * \brief Type of function used to compare values
@@ -460,12 +451,12 @@ public:
     //! Clears the screen to blank
     virtual void Clear() = 0;
 
-    //! Sets current rendering mode
-    virtual void SetRenderMode(RenderMode mode) = 0;
     //! Returns UI renderer
     virtual CUIRenderer* GetUIRenderer() = 0;
     //! Returns terrain renderer
     virtual CTerrainRenderer* GetTerrainRenderer() = 0;
+    //! Returns shadow renderer
+    virtual CShadowRenderer* GetShadowRenderer() = 0;
 
     //! Restores device rendering mode
     virtual void Restore() = 0;

src/graphics/core/renderers.h

@@ -101,4 +101,27 @@ public:
     virtual void DrawObject(const glm::mat4& matrix, const CVertexBuffer* buffer) = 0;
 };
 
+class CShadowRenderer : public CRenderer
+{
+public:
+    virtual ~CShadowRenderer() { }
+
+    virtual void Begin() = 0;
+
+    virtual void End() = 0;
+
+    //! Sets projection matrix
+    virtual void SetProjectionMatrix(const glm::mat4& matrix) = 0;
+    //! Sets view matrix
+    virtual void SetViewMatrix(const glm::mat4& matrix) = 0;
+    //! Sets model matrix
+    virtual void SetModelMatrix(const glm::mat4& matrix) = 0;
+
+    //! Sets texture
+    virtual void SetTexture(const Texture& texture) = 0;
+
+    //! Draws terrain object
+    virtual void DrawObject(const CVertexBuffer* buffer, bool transparent) = 0;
+};
+
 } // namespace Gfx

src/graphics/engine/engine.cpp

@@ -3954,7 +3954,6 @@ void CEngine::RenderShadowMap()
         m_device->GetFramebuffer("shadow")->Bind();
     }
 
-    m_device->SetRenderMode(RENDER_MODE_SHADOW);
     m_device->Clear();
 
     // change state to rendering shadow maps
@@ -4028,8 +4027,16 @@ void CEngine::RenderShadowMap()
     m_device->SetTexture(1, 0);
     m_device->SetTexture(2, 0);
 
+    m_device->SetRenderState(RENDER_STATE_ALPHA_TEST, true);
+    m_device->SetRenderState(RENDER_STATE_CULLING, false);
+
     auto projectionViewMatrix = Math::MultiplyMatrices(m_shadowProjMat, m_shadowViewMat);
 
+    auto renderer = m_device->GetShadowRenderer();
+    renderer->Begin();
+    renderer->SetProjectionMatrix(m_shadowProjMat);
+    renderer->SetViewMatrix(m_shadowViewMat);
+
     // render objects into shadow map
     for (int objRank = 0; objRank < static_cast<int>(m_objects.size()); objRank++)
     {
@@ -4038,24 +4045,8 @@ void CEngine::RenderShadowMap()
 
         bool terrain = (m_objects[objRank].type == ENG_OBJTYPE_TERRAIN);
 
-        if (terrain)
+        if (terrain && !m_terrainShadows) continue;
-        {
-            if (m_terrainShadows)
-            {
-                m_device->SetRenderState(RENDER_STATE_ALPHA_TEST, false);
-                m_device->SetRenderState(RENDER_STATE_CULLING, true);
-                m_device->SetCullMode(CULL_CCW);
-            }
-            else
-                continue;
-        }
-        else
-        {
-            m_device->SetRenderState(RENDER_STATE_ALPHA_TEST, true);
-            m_device->SetRenderState(RENDER_STATE_CULLING, false);
-        }
 
-        m_device->SetTransform(TRANSFORM_WORLD, m_objects[objRank].transform);
         auto combinedMatrix = Math::MultiplyMatrices(projectionViewMatrix, m_objects[objRank].transform);
 
         if (!IsVisible(combinedMatrix, objRank))
@@ -4071,21 +4062,25 @@ void CEngine::RenderShadowMap()
         if (!p1.used)
             continue;
 
+        renderer->SetModelMatrix(m_objects[objRank].transform);
+
         for (int l2 = 0; l2 < static_cast<int>(p1.next.size()); l2++)
         {
             EngineBaseObjTexTier& p2 = p1.next[l2];
 
-            SetTexture(p2.tex1, 0);
+            renderer->SetTexture(p2.tex1);
 
             for (int l3 = 0; l3 < static_cast<int>(p2.next.size()); l3++)
             {
                 EngineBaseObjDataTier& p3 = p2.next[l3];
 
-                DrawObject(p3);
+                renderer->DrawObject(p3.buffer, true);
             }
         }
     }
 
+    renderer->End();
+
     m_device->SetRenderState(RENDER_STATE_DEPTH_BIAS, false);
     m_device->SetDepthBias(0.0f, 0.0f);
     m_device->SetRenderState(RENDER_STATE_ALPHA_TEST, false);
@@ -4109,7 +4104,7 @@ void CEngine::RenderShadowMap()
 
     CProfiler::StopPerformanceCounter(PCNT_RENDER_SHADOW_MAP);
 
-    m_device->SetRenderMode(RENDER_MODE_NORMAL);
+    m_device->Restore();
     m_device->SetRenderState(RENDER_STATE_DEPTH_TEST, false);
 }
 
@@ -4219,7 +4214,7 @@ void CEngine::DrawObject(const EngineBaseObjDataTier& p4)
 
 void CEngine::DrawInterface()
 {
-    m_device->SetRenderMode(RENDER_MODE_NORMAL);
+    m_device->Restore();
 
     m_device->SetRenderState(RENDER_STATE_DEPTH_TEST, false);
     m_device->SetRenderState(RENDER_STATE_LIGHTING, false);
@@ -4253,7 +4248,7 @@ void CEngine::DrawInterface()
     // 3D objects drawn in front of interface
     if (m_drawFront)
     {
-        m_device->SetRenderMode(RENDER_MODE_NORMAL);
+        m_device->Restore();
 
         // Display the objects
         m_device->SetRenderState(RENDER_STATE_DEPTH_TEST, true);
@@ -4327,7 +4322,7 @@ void CEngine::DrawInterface()
         m_device->SetRenderState(RENDER_STATE_LIGHTING, false);
         m_device->SetRenderState(RENDER_STATE_FOG, false);
 
-        m_device->SetRenderMode(RENDER_MODE_NORMAL);
+        m_device->Restore();
 
         SetInterfaceCoordinates();
     }
@@ -4346,7 +4341,7 @@ void CEngine::DrawInterface()
     if (m_renderInterface)
         DrawMouse();
 
-    m_device->SetRenderMode(RENDER_MODE_NORMAL);
+    m_device->Restore();
 }
 
 void CEngine::UpdateGroundSpotTextures()
@@ -4858,7 +4853,7 @@ void CEngine::DrawShadowSpots()
 
 void CEngine::DrawBackground()
 {
-    m_device->SetRenderMode(RENDER_MODE_NORMAL);
+    m_device->Restore();
 
     if (m_cloud->GetLevel() != 0.0f)  // clouds ?
     {
@@ -4876,7 +4871,7 @@ void CEngine::DrawBackground()
         DrawBackgroundImage();  // image
     }
 
-    m_device->SetRenderMode(RENDER_MODE_NORMAL);
+    m_device->Restore();
 }
 
 void CEngine::DrawBackgroundGradient(const Color& up, const Color& down)
@@ -5033,7 +5028,7 @@ void CEngine::DrawForegroundImage()
     SetTexture(m_foregroundTex);
     SetState(ENG_RSTATE_CLAMP | ENG_RSTATE_TTEXTURE_BLACK);
 
-    m_device->SetRenderMode(RENDER_MODE_NORMAL);
+    m_device->Restore();
 
     m_device->SetTransform(TRANSFORM_VIEW, m_matViewInterface);
     m_device->SetTransform(TRANSFORM_PROJECTION, m_matProjInterface);
@@ -5059,7 +5054,7 @@ void CEngine::DrawOverColor()
         Color(0.0f, 0.0f, 0.0f, 0.0f)
     };
 
-    m_device->SetRenderMode(RENDER_MODE_NORMAL);
+    m_device->Restore();
 
     SetState(m_overMode);
 
@@ -5079,7 +5074,7 @@ void CEngine::DrawOverColor()
     m_device->DrawPrimitive(PRIMITIVE_TRIANGLE_STRIP, vertex, 4);
     AddStatisticTriangle(2);
 
-    m_device->SetRenderMode(RENDER_MODE_NORMAL);
+    m_device->Restore();
 }
 
 void CEngine::DrawHighlight()

src/graphics/opengl/gl33device.cpp

@@ -337,42 +337,11 @@ bool CGL33Device::Create()
     glDeleteShader(shaders[0]);
     glDeleteShader(shaders[1]);
 
-    // Create program for shadow rendering
-    strcpy(filename, "shaders/gl33/vs_shadow.glsl");
-    shaders[0] = LoadShader(GL_VERTEX_SHADER, filename);
-    if (shaders[0] == 0)
-    {
-        m_errorMessage = GetLastShaderError();
-        GetLogger()->Error("Cound not create vertex shader from file '%s'\n", filename);
-        return false;
-    }
-
-    strcpy(filename, "shaders/gl33/fs_shadow.glsl");
-    shaders[1] = LoadShader(GL_FRAGMENT_SHADER, filename);
-    if (shaders[1] == 0)
-    {
-        m_errorMessage = GetLastShaderError();
-        GetLogger()->Error("Cound not create fragment shader from file '%s'\n", filename);
-        return false;
-    }
-
-    m_shadowProgram = LinkProgram(2, shaders);
-    if (m_shadowProgram == 0)
-    {
-        m_errorMessage = GetLastShaderError();
-        GetLogger()->Error("Cound not link shader program for shadow rendering\n");
-        return false;
-    }
-
-    glDeleteShader(shaders[0]);
-    glDeleteShader(shaders[1]);
-
     // Obtain uniform locations
-    // Obtain uniform locations for normal program
     glUseProgram(m_normalProgram);
 
     {
-        UniformLocations &uni = m_uniforms[0];
+        UniformLocations &uni = m_uniforms;
 
         uni.projectionMatrix = glGetUniformLocation(m_normalProgram, "uni_ProjectionMatrix");
         uni.viewMatrix = glGetUniformLocation(m_normalProgram, "uni_ViewMatrix");
@@ -463,45 +432,11 @@ bool CGL33Device::Create()
         glUniform1i(uni.lightCount, 0);
     }
 
-    // Obtain uniform locations for shadow program
-    glUseProgram(m_shadowProgram);
-
-    {
-        UniformLocations &uni = m_uniforms[1];
-
-        uni.projectionMatrix = glGetUniformLocation(m_shadowProgram, "uni_ProjectionMatrix");
-        uni.viewMatrix = glGetUniformLocation(m_shadowProgram, "uni_ViewMatrix");
-        uni.modelMatrix = glGetUniformLocation(m_shadowProgram, "uni_ModelMatrix");
-
-        uni.primaryTexture = glGetUniformLocation(m_shadowProgram, "uni_Texture");
-
-        uni.textureEnabled[0] = glGetUniformLocation(m_shadowProgram, "uni_TextureEnabled");
-        uni.textureEnabled[1] = -1;
-        uni.textureEnabled[2] = -1;
-
-        uni.alphaTestEnabled = glGetUniformLocation(m_shadowProgram, "uni_AlphaTestEnabled");
-        uni.alphaReference = glGetUniformLocation(m_shadowProgram, "uni_AlphaReference");
-
-        // Set default uniform values
-        Math::Matrix matrix;
-        matrix.LoadIdentity();
-
-        glUniformMatrix4fv(uni.projectionMatrix, 1, GL_FALSE, matrix.Array());
-        glUniformMatrix4fv(uni.viewMatrix, 1, GL_FALSE, matrix.Array());
-        glUniformMatrix4fv(uni.modelMatrix, 1, GL_FALSE, matrix.Array());
-
-        glUniform1i(uni.primaryTexture, 0);
-
-        glUniform1i(uni.textureEnabled[0], 0);
-
-        glUniform1i(uni.alphaTestEnabled, 0);
-        glUniform1f(uni.alphaReference, 1.0f);
-    }
-
     m_uiRenderer = std::make_unique<CGL33UIRenderer>(this);
     m_terrainRenderer = std::make_unique<CGL33TerrainRenderer>(this);
+    m_shadowRenderer = std::make_unique<CGL33ShadowRenderer>(this);
 
-    SetRenderMode(RENDER_MODE_NORMAL);
+    glUseProgram(m_normalProgram);
 
     // create default framebuffer object
     FramebufferParams framebufferParams;
@@ -535,7 +470,6 @@ void CGL33Device::Destroy()
     // delete shader program
     glUseProgram(0);
     glDeleteProgram(m_normalProgram);
-    glDeleteProgram(m_shadowProgram);
 
     // delete framebuffers
     for (auto& framebuffer : m_framebuffers)
@@ -592,9 +526,9 @@ void CGL33Device::BeginScene()
 {
     Clear();
 
-    glUniformMatrix4fv(m_uni->projectionMatrix, 1, GL_FALSE, m_projectionMat.Array());
+    glUniformMatrix4fv(m_uniforms.projectionMatrix, 1, GL_FALSE, m_projectionMat.Array());
-    glUniformMatrix4fv(m_uni->viewMatrix, 1, GL_FALSE, m_viewMat.Array());
+    glUniformMatrix4fv(m_uniforms.viewMatrix, 1, GL_FALSE, m_viewMat.Array());
-    glUniformMatrix4fv(m_uni->modelMatrix, 1, GL_FALSE, m_worldMat.Array());
+    glUniformMatrix4fv(m_uniforms.modelMatrix, 1, GL_FALSE, m_worldMat.Array());
 }
 
 void CGL33Device::EndScene()
@@ -612,32 +546,6 @@ void CGL33Device::Clear()
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 }
 
-void CGL33Device::SetRenderMode(RenderMode mode)
-{
-    m_uiRenderer->Flush();
-
-    switch (mode)
-    {
-    case RENDER_MODE_NORMAL:
-        glUseProgram(m_normalProgram);
-        m_mode = 0;
-        break;
-    case RENDER_MODE_SHADOW:
-        glUseProgram(m_shadowProgram);
-        m_mode = 1;
-        break;
-    default:
-        assert(false);
-        return;
-    }
-
-    m_uni = &m_uniforms[m_mode];
-
-    UpdateTextureState(0);
-    UpdateTextureState(1);
-    UpdateTextureState(2);
-}
-
 CUIRenderer* CGL33Device::GetUIRenderer()
 {
     return m_uiRenderer.get();
@@ -648,17 +556,19 @@ CTerrainRenderer* CGL33Device::GetTerrainRenderer()
     return m_terrainRenderer.get();
 }
 
+CShadowRenderer* CGL33Device::GetShadowRenderer()
+{
+    return m_shadowRenderer.get();
+}
+
 void CGL33Device::Restore()
 {
-    switch (m_mode)
+    m_uiRenderer->Flush();
-    {
+    glUseProgram(m_normalProgram);
-    case 0:
+
-        glUseProgram(m_normalProgram);
+    //UpdateTextureState(0);
-        break;
+    //UpdateTextureState(1);
-    case 1:
+    //UpdateTextureState(2);
-        glUseProgram(m_shadowProgram);
-        break;
-    }
 }
 
 void CGL33Device::SetTransform(TransformType type, const Math::Matrix &matrix)
@@ -666,7 +576,7 @@ void CGL33Device::SetTransform(TransformType type, const Math::Matrix &matrix)
     if      (type == TRANSFORM_WORLD)
     {
         m_worldMat = matrix;
-        glUniformMatrix4fv(m_uni->modelMatrix, 1, GL_FALSE, m_worldMat.Array());
+        glUniformMatrix4fv(m_uniforms.modelMatrix, 1, GL_FALSE, m_worldMat.Array());
 
         m_modelviewMat = Math::MultiplyMatrices(m_viewMat, m_worldMat);
         m_combinedMatrixOutdated = true;
@@ -677,7 +587,7 @@ void CGL33Device::SetTransform(TransformType type, const Math::Matrix &matrix)
         if (fabs(normalMat.Det()) > 1e-6)
             normalMat = normalMat.Inverse();
 
-        glUniformMatrix4fv(m_uni->normalMatrix, 1, GL_TRUE, normalMat.Array());
+        glUniformMatrix4fv(m_uniforms.normalMatrix, 1, GL_TRUE, normalMat.Array());
     }
     else if (type == TRANSFORM_VIEW)
     {
@@ -689,13 +599,13 @@ void CGL33Device::SetTransform(TransformType type, const Math::Matrix &matrix)
         m_modelviewMat = Math::MultiplyMatrices(m_viewMat, m_worldMat);
         m_combinedMatrixOutdated = true;
 
-        glUniformMatrix4fv(m_uni->viewMatrix, 1, GL_FALSE, m_viewMat.Array());
+        glUniformMatrix4fv(m_uniforms.viewMatrix, 1, GL_FALSE, m_viewMat.Array());
 
-        if (m_uni->cameraPosition >= 0)
+        if (m_uniforms.cameraPosition >= 0)
         {
             cameraPosition.LoadZero();
             cameraPosition = MatrixVectorMultiply(m_viewMat.Inverse(), cameraPosition);
-            glUniform3fv(m_uni->cameraPosition, 1, cameraPosition.Array());
+            glUniform3fv(m_uniforms.cameraPosition, 1, cameraPosition.Array());
         }
     }
     else if (type == TRANSFORM_PROJECTION)
@@ -703,12 +613,12 @@ void CGL33Device::SetTransform(TransformType type, const Math::Matrix &matrix)
         m_projectionMat = matrix;
         m_combinedMatrixOutdated = true;
 
-        glUniformMatrix4fv(m_uni->projectionMatrix, 1, GL_FALSE, m_projectionMat.Array());
+        glUniformMatrix4fv(m_uniforms.projectionMatrix, 1, GL_FALSE, m_projectionMat.Array());
     }
     else if (type == TRANSFORM_SHADOW)
     {
         Math::Matrix temp = matrix;
-        glUniformMatrix4fv(m_uni->shadowMatrix, 1, GL_FALSE, temp.Array());
+        glUniformMatrix4fv(m_uniforms.shadowMatrix, 1, GL_FALSE, temp.Array());
     }
     else
     {
@@ -720,9 +630,9 @@ void CGL33Device::SetMaterial(const Material &material)
 {
     m_material = material;
 
-    glUniform4fv(m_uni->ambientColor, 1, m_material.ambient.Array());
+    glUniform4fv(m_uniforms.ambientColor, 1, m_material.ambient.Array());
-    glUniform4fv(m_uni->diffuseColor, 1, m_material.diffuse.Array());
+    glUniform4fv(m_uniforms.diffuseColor, 1, m_material.diffuse.Array());
-    glUniform4fv(m_uni->specularColor, 1, m_material.specular.Array());
+    glUniform4fv(m_uniforms.specularColor, 1, m_material.specular.Array());
 }
 
 int CGL33Device::GetMaxLightCount()
@@ -1513,19 +1423,19 @@ void CGL33Device::SetRenderState(RenderState state, bool enabled)
 
         m_updateLights = true;
 
-        //glUniform1i(m_uni->lightingEnabled, enabled ? 1 : 0);
+        //glUniform1i(m_uniforms.lightingEnabled, enabled ? 1 : 0);
 
         return;
     }
     else if (state == RENDER_STATE_FOG)
     {
-        glUniform1i(m_uni->fogEnabled, enabled ? 1 : 0);
+        glUniform1i(m_uniforms.fogEnabled, enabled ? 1 : 0);
 
         return;
     }
     else if (state == RENDER_STATE_ALPHA_TEST)
     {
-        glUniform1i(m_uni->alphaTestEnabled, enabled ? 1 : 0);
+        glUniform1i(m_uniforms.alphaTestEnabled, enabled ? 1 : 0);
 
         return;
     }
@@ -1570,7 +1480,7 @@ void CGL33Device::SetDepthBias(float factor, float units)
 
 void CGL33Device::SetAlphaTestFunc(CompFunc func, float refValue)
 {
-    glUniform1f(m_uni->alphaReference, refValue);
+    glUniform1f(m_uniforms.alphaReference, refValue);
 }
 
 void CGL33Device::SetBlendFunc(BlendFunc srcBlend, BlendFunc dstBlend)
@@ -1592,8 +1502,8 @@ void CGL33Device::SetFogParams(FogMode mode, const Color &color, float start, fl
 {
     // TODO: reimplement
 
-    glUniform2f(m_uni->fogRange, start, end);
+    glUniform2f(m_uniforms.fogRange, start, end);
-    glUniform4f(m_uni->fogColor, color.r, color.g, color.b, color.a);
+    glUniform4f(m_uniforms.fogColor, color.r, color.g, color.b, color.a);
 
     /*
     if      (mode == FOG_LINEAR) glFogi(GL_FOG_MODE, GL_LINEAR);
@@ -1624,7 +1534,7 @@ void CGL33Device::SetShadeModel(ShadeModel model)
 
 void CGL33Device::SetShadowColor(float value)
 {
-    glUniform1f(m_uni->shadowColor, value);
+    glUniform1f(m_uniforms.shadowColor, value);
 }
 
 void CGL33Device::SetFillMode(FillMode mode)
@@ -1690,7 +1600,7 @@ void CGL33Device::DeleteFramebuffer(std::string name)
 inline void CGL33Device::UpdateTextureState(int index)
 {
     bool enabled = m_texturesEnabled[index] && (m_currentTextures[index].id != 0);
-    glUniform1i(m_uni->textureEnabled[index], enabled ? 1 : 0);
+    glUniform1i(m_uniforms.textureEnabled[index], enabled ? 1 : 0);
 }
 
 void CGL33Device::UpdateLights()
@@ -1715,7 +1625,7 @@ void CGL33Device::UpdateLights()
             if (m_lights[i].type != LIGHT_DIRECTIONAL) continue;
 
             Light &light = m_lights[i];
-            LightLocations &uni = m_uni->lights[index];
+            LightLocations &uni = m_uniforms.lights[index];
 
             glUniform4fv(uni.ambient, 1, light.ambient.Array());
             glUniform4fv(uni.diffuse, 1, light.diffuse.Array());
@@ -1726,12 +1636,12 @@ void CGL33Device::UpdateLights()
             index++;
         }
 
-        glUniform1i(m_uni->lightCount, index);
+        glUniform1i(m_uniforms.lightCount, index);
     }
     // Lighting disabled
     else
     {
-        glUniform1i(m_uni->lightCount, 0);
+        glUniform1i(m_uniforms.lightCount, 0);
     }
 }
 

src/graphics/opengl/gl33device.h

@@ -82,6 +82,7 @@ public:
 
 class CGL33UIRenderer;
 class CGL33TerrainRenderer;
+class CGL33ShadowRenderer;
 
 /**
   \class CGL33Device
@@ -115,9 +116,9 @@ public:
 
     void Clear() override;
 
-    void SetRenderMode(RenderMode mode) override;
     CUIRenderer* GetUIRenderer() override;
     CTerrainRenderer* GetTerrainRenderer() override;
+    CShadowRenderer* GetShadowRenderer() override;
 
     void Restore() override;
 
@@ -296,22 +297,20 @@ private:
 
     //! Shader program for normal rendering
     GLuint m_normalProgram = 0;
-    //! Shader program for shadow rendering
-    GLuint m_shadowProgram = 0;
 
     DynamicBuffer m_dynamicBuffer;
 
     //! Current mode
     unsigned int m_mode = 0;
     //! Uniform locations for all modes
-    UniformLocations m_uniforms[3];
+    UniformLocations m_uniforms;
-    //! Uniform locations for current mode
-    UniformLocations* m_uni = nullptr;
 
     //! Interface renderer
     std::unique_ptr<CGL33UIRenderer> m_uiRenderer;
     //! Terrain renderer
     std::unique_ptr<CGL33TerrainRenderer> m_terrainRenderer;
+    //! Shadow renderer
+    std::unique_ptr<CGL33ShadowRenderer> m_shadowRenderer;
 };
 
 } // namespace Gfx

src/graphics/opengl/gl33renderers.cpp

@@ -415,4 +415,116 @@ void CGL33TerrainRenderer::Flush()
 
 }
 
+CGL33ShadowRenderer::CGL33ShadowRenderer(CGL33Device* device)
+    : m_device(device)
+{
+    GetLogger()->Info("Creating CGL33ShadowRenderer\n");
+
+    GLint shaders[2] = {};
+
+    shaders[0] = LoadShader(GL_VERTEX_SHADER, "shaders/gl33/shadow_vs.glsl");
+    if (shaders[0] == 0)
+    {
+        GetLogger()->Error("Cound not create vertex shader from file 'shadow_vs.glsl'\n");
+        return;
+    }
+
+    shaders[1] = LoadShader(GL_FRAGMENT_SHADER, "shaders/gl33/shadow_fs.glsl");
+    if (shaders[1] == 0)
+    {
+        GetLogger()->Error("Cound not create fragment shader from file 'shadow_fs.glsl'\n");
+        return;
+    }
+
+    m_program = LinkProgram(2, shaders);
+    if (m_program == 0)
+    {
+        GetLogger()->Error("Cound not link shader program for terrain renderer\n");
+        return;
+    }
+
+    glDeleteShader(shaders[0]);
+    glDeleteShader(shaders[1]);
+
+    glUseProgram(m_program);
+
+    // Setup uniforms
+    auto texture = glGetUniformLocation(m_program, "uni_Texture");
+    glUniform1i(texture, 0);
+
+    auto identity = glm::identity<glm::mat4>();
+
+    m_projectionMatrix = glGetUniformLocation(m_program, "uni_ProjectionMatrix");
+    m_viewMatrix = glGetUniformLocation(m_program, "uni_ViewMatrix");
+    m_modelMatrix = glGetUniformLocation(m_program, "uni_ModelMatrix");
+    m_alphaScissor = glGetUniformLocation(m_program, "uni_AlphaScissor");
+
+    glUseProgram(0);
+
+    GetLogger()->Info("CGL33ShadowRenderer created successfully\n");
+}
+
+CGL33ShadowRenderer::~CGL33ShadowRenderer()
+{
+    glDeleteProgram(m_program);
+}
+
+void CGL33ShadowRenderer::Begin()
+{
+    glUseProgram(m_program);
+}
+
+void CGL33ShadowRenderer::End()
+{
+    m_device->Restore();
+}
+
+void CGL33ShadowRenderer::SetProjectionMatrix(const glm::mat4& matrix)
+{
+    glUniformMatrix4fv(m_projectionMatrix, 1, GL_FALSE, value_ptr(matrix));
+}
+
+void CGL33ShadowRenderer::SetViewMatrix(const glm::mat4& matrix)
+{
+    glm::mat4 scale(1.0f);
+    scale[2][2] = -1.0f;
+
+    auto viewMatrix = scale * matrix;
+
+    glUniformMatrix4fv(m_viewMatrix, 1, GL_FALSE, value_ptr(viewMatrix));
+}
+
+void CGL33ShadowRenderer::SetModelMatrix(const glm::mat4& matrix)
+{
+    glUniformMatrix4fv(m_modelMatrix, 1, GL_FALSE, value_ptr(matrix));
+}
+
+void CGL33ShadowRenderer::SetTexture(const Texture& texture)
+{
+    glActiveTexture(GL_TEXTURE0);
+    glBindTexture(GL_TEXTURE_2D, texture.id);
+}
+
+void CGL33ShadowRenderer::DrawObject(const CVertexBuffer* buffer, bool transparent)
+{
+    auto b = dynamic_cast<const CGL33VertexBuffer*>(buffer);
+
+    if (b == nullptr)
+    {
+        GetLogger()->Error("No vertex buffer");
+        return;
+    }
+
+    glUniform1i(m_alphaScissor, transparent ? 1 : 0);
+
+    glBindVertexArray(b->GetVAO());
+
+    glDrawArrays(TranslateGfxPrimitive(b->GetType()), 0, b->Size());
+}
+
+void CGL33ShadowRenderer::Flush()
+{
+
+}
+
 } // namespace Gfx

src/graphics/opengl/gl33renderers.h

@@ -153,4 +153,42 @@ private:
     GLuint m_shadowMap = 0;
 };
 
+class CGL33ShadowRenderer : public CShadowRenderer
+{
+public:
+    CGL33ShadowRenderer(CGL33Device* device);
+    virtual ~CGL33ShadowRenderer();
+
+    virtual void Begin() override;
+
+    virtual void End() override;
+
+    //! Sets projection matrix
+    virtual void SetProjectionMatrix(const glm::mat4& matrix) override;
+    //! Sets view matrix
+    virtual void SetViewMatrix(const glm::mat4& matrix) override;
+    //! Sets model matrix
+    virtual void SetModelMatrix(const glm::mat4& matrix) override;
+
+    //! Sets texture
+    virtual void SetTexture(const Texture& texture) override;
+
+    //! Draws terrain object
+    virtual void DrawObject(const CVertexBuffer* buffer, bool transparent) override;
+
+    virtual void Flush() override;
+
+private:
+    CGL33Device* const m_device;
+
+    // Uniform data
+    GLint m_projectionMatrix = -1;
+    GLint m_viewMatrix = -1;
+    GLint m_modelMatrix = -1;
+    GLint m_alphaScissor = -1;
+
+    // Shader program
+    GLuint m_program = 0;
+};
+
 } // namespace Gfx

src/graphics/opengl/shaders/gl33/shadow_fs.glsl

@@ -0,0 +1,44 @@
+/*
+ * This file is part of the Colobot: Gold Edition source code
+ * Copyright (C) 2001-2021, Daniel Roux, EPSITEC SA & TerranovaTeam
+ * http://epsitec.ch; http://colobot.info; http://github.com/colobot
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see http://gnu.org/licenses
+ */
+
+// FRAGMENT SHADER - SHADOW MODE
+#version 330 core
+
+uniform sampler2D uni_Texture;
+
+uniform bool uni_AlphaScissor;
+
+in VertexData
+{
+    vec2 TexCoord;
+} data;
+
+out vec4 out_FragColor;
+
+void main()
+{
+    if (uni_AlphaScissor)
+    {
+        float alpha = texture(uni_Texture, data.TexCoord).a;
+
+        if (alpha < 0.5) discard;
+    }
+
+    out_FragColor = vec4(1.0f);
+}

src/graphics/opengl/shaders/gl33/shadow_vs.glsl

@@ -0,0 +1,40 @@
+/*
+ * This file is part of the Colobot: Gold Edition source code
+ * Copyright (C) 2001-2021, Daniel Roux, EPSITEC SA & TerranovaTeam
+ * http://epsitec.ch; http://colobot.info; http://github.com/colobot
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see http://gnu.org/licenses
+ */
+
+// VERTEX SHADER - SHADOW MODE
+#version 330 core
+
+uniform mat4 uni_ProjectionMatrix;
+uniform mat4 uni_ViewMatrix;
+uniform mat4 uni_ModelMatrix;
+
+layout(location = 0) in vec4 in_VertexCoord;
+layout(location = 3) in vec2 in_TexCoord0;
+
+out VertexData
+{
+    vec2 TexCoord;
+} data;
+
+void main()
+{
+    gl_Position = uni_ProjectionMatrix * uni_ViewMatrix * uni_ModelMatrix * in_VertexCoord;
+
+    data.TexCoord = in_TexCoord0;
+}