Static objects using OpenGL VBOs and display lists

2 files changed, 256 insertions, 2 deletions

diff --git a/src/graphics/opengl/gldevice.cpp b/src/graphics/opengl/gldevice.cpp
index a6ba1eb..2d284d0 100644
--- a/src/graphics/opengl/gldevice.cpp
+++ b/src/graphics/opengl/gldevice.cpp
@@ -73,6 +73,8 @@ CGLDevice::CGLDevice(const GLDeviceConfig &config)
 {
     m_config = config;
     m_lighting = false;
+    m_lastVboId = 0;
+    m_useVbo = false;
 }
 
 
@@ -109,6 +111,16 @@ bool CGLDevice::Create()
             GetLogger()->Error("GLEW reports required extensions not supported\n");
             return false;
         }
+
+        if (GLEW_ARB_vertex_buffer_object)
+        {
+            GetLogger()->Info("Detected ARB_vertex_buffer_object extension - using VBOs\n");
+            m_useVbo = true;
+        }
+        else
+        {
+            GetLogger()->Info("No ARB_vertex_buffer_object extension present - using display lists\n");
+        }
     }
 #endif
 
@@ -174,6 +186,16 @@ void CGLDevice::ConfigChanged(const GLDeviceConfig& newConfig)
     Create();
 }
 
+void CGLDevice::SetUseVbo(bool useVbo)
+{
+    m_useVbo = useVbo;
+}
+
+bool CGLDevice::GetUseVbo()
+{
+    return m_useVbo;
+}
+
 void CGLDevice::BeginScene()
 {
     Clear();
@@ -927,6 +949,206 @@ void CGLDevice::DrawPrimitive(PrimitiveType type, const VertexCol *vertices, int
     glDisableClientState(GL_COLOR_ARRAY);
 }
 
+unsigned int CGLDevice::CreateStaticObject(PrimitiveType primitiveType, const Vertex* vertices, int vertexCount)
+{
+    unsigned int id = 0;
+    if (m_useVbo)
+    {
+        id = ++m_lastVboId;
+
+        VboObjectInfo info;
+        info.primitiveType = primitiveType;
+        info.vertexType = VERTEX_TYPE_NORMAL;
+        info.vertexCount = vertexCount;
+        info.bufferId = 0;
+
+        glGenBuffers(1, &info.bufferId);
+        glBindBuffer(GL_ARRAY_BUFFER, info.bufferId);
+        glBufferData(GL_ARRAY_BUFFER, vertexCount * sizeof(Vertex), vertices, GL_STATIC_DRAW);
+        glBindBuffer(GL_ARRAY_BUFFER, 0);
+
+        m_vboObjects[id] = info;
+    }
+    else
+    {
+        id = glGenLists(1);
+
+        glNewList(id, GL_COMPILE);
+
+        DrawPrimitive(primitiveType, vertices, vertexCount);
+
+        glEndList();
+    }
+
+    return id;
+}
+
+unsigned int CGLDevice::CreateStaticObject(PrimitiveType primitiveType, const VertexTex2* vertices, int vertexCount)
+{
+    unsigned int id = 0;
+    if (m_useVbo)
+    {
+        id = ++m_lastVboId;
+
+        VboObjectInfo info;
+        info.primitiveType = primitiveType;
+        info.vertexType = VERTEX_TYPE_TEX2;
+        info.vertexCount = vertexCount;
+        info.bufferId = 0;
+
+        glGenBuffers(1, &info.bufferId);
+        glBindBuffer(GL_ARRAY_BUFFER, info.bufferId);
+        glBufferData(GL_ARRAY_BUFFER, vertexCount * sizeof(VertexTex2), vertices, GL_STATIC_DRAW);
+        glBindBuffer(GL_ARRAY_BUFFER, 0);
+
+        m_vboObjects[id] = info;
+    }
+    else
+    {
+        id = glGenLists(1);
+
+        glNewList(id, GL_COMPILE);
+
+        DrawPrimitive(primitiveType, vertices, vertexCount);
+
+        glEndList();
+    }
+
+    return id;
+}
+
+unsigned int CGLDevice::CreateStaticObject(PrimitiveType primitiveType, const VertexCol* vertices, int vertexCount)
+{
+    unsigned int id = 0;
+    if (m_useVbo)
+    {
+        id = ++m_lastVboId;
+
+        VboObjectInfo info;
+        info.primitiveType = primitiveType;
+        info.vertexType = VERTEX_TYPE_COL;
+        info.vertexCount = vertexCount;
+        info.bufferId = 0;
+
+        glGenBuffers(1, &info.bufferId);
+        glBindBuffer(GL_ARRAY_BUFFER, info.bufferId);
+        glBufferData(GL_ARRAY_BUFFER, vertexCount * sizeof(VertexCol), vertices, GL_STATIC_DRAW);
+        glBindBuffer(GL_ARRAY_BUFFER, 0);
+
+        m_vboObjects[id] = info;
+    }
+    else
+    {
+        id = glGenLists(1);
+
+        glNewList(id, GL_COMPILE);
+
+        DrawPrimitive(primitiveType, vertices, vertexCount);
+
+        glEndList();
+    }
+
+    return id;
+}
+
+void CGLDevice::DrawStaticObject(unsigned int objectId)
+{
+    if (m_useVbo)
+    {
+        auto it = m_vboObjects.find(objectId);
+        if (it == m_vboObjects.end())
+            return;
+
+        glEnable(GL_VERTEX_ARRAY);
+        glBindBuffer(GL_ARRAY_BUFFER, (*it).second.bufferId);
+
+        if ((*it).second.vertexType == VERTEX_TYPE_NORMAL)
+        {
+            glEnableClientState(GL_VERTEX_ARRAY);
+            glVertexPointer(3, GL_FLOAT, sizeof(Vertex), static_cast<char*>(nullptr) + offsetof(Vertex, coord));
+
+            glEnableClientState(GL_NORMAL_ARRAY);
+            glNormalPointer(GL_FLOAT, sizeof(Vertex), static_cast<char*>(nullptr) + offsetof(Vertex, normal));
+
+            glActiveTexture(GL_TEXTURE0);
+            glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+            glTexCoordPointer(2, GL_FLOAT, sizeof(Vertex), static_cast<char*>(nullptr) + offsetof(Vertex, texCoord));
+        }
+        else if ((*it).second.vertexType == VERTEX_TYPE_TEX2)
+        {
+            glEnableClientState(GL_VERTEX_ARRAY);
+            glVertexPointer(3, GL_FLOAT, sizeof(VertexTex2), static_cast<char*>(nullptr) + offsetof(VertexTex2, coord));
+
+            glEnableClientState(GL_NORMAL_ARRAY);
+            glNormalPointer(GL_FLOAT, sizeof(VertexTex2), static_cast<char*>(nullptr) + offsetof(VertexTex2, normal));
+
+            glClientActiveTexture(GL_TEXTURE0);
+            glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+            glTexCoordPointer(2, GL_FLOAT, sizeof(VertexTex2), static_cast<char*>(nullptr) + offsetof(VertexTex2, texCoord));
+
+            glClientActiveTexture(GL_TEXTURE1);
+            glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+            glTexCoordPointer(2, GL_FLOAT, sizeof(VertexTex2), static_cast<char*>(nullptr) + offsetof(VertexTex2, texCoord2));
+        }
+        else if ((*it).second.vertexType == VERTEX_TYPE_COL)
+        {
+            glEnableClientState(GL_VERTEX_ARRAY);
+            glVertexPointer(3, GL_FLOAT, sizeof(VertexCol), static_cast<char*>(nullptr) + offsetof(VertexCol, coord));
+
+            glEnableClientState(GL_COLOR_ARRAY);
+            glColorPointer(4, GL_FLOAT, sizeof(VertexCol), static_cast<char*>(nullptr) + offsetof(VertexCol, color));
+        }
+
+        GLenum mode = TranslateGfxPrimitive((*it).second.primitiveType);
+        glDrawArrays(GL_TRIANGLES, 0, (*it).second.vertexCount);
+
+        if ((*it).second.vertexType == VERTEX_TYPE_NORMAL)
+        {
+            glDisableClientState(GL_VERTEX_ARRAY);
+            glDisableClientState(GL_NORMAL_ARRAY);
+            glDisableClientState(GL_TEXTURE_COORD_ARRAY); // GL_TEXTURE0
+        }
+        else if ((*it).second.vertexType == VERTEX_TYPE_TEX2)
+        {
+            glDisableClientState(GL_VERTEX_ARRAY);
+            glDisableClientState(GL_NORMAL_ARRAY);
+            glDisableClientState(GL_TEXTURE_COORD_ARRAY); // GL_TEXTURE1
+            glClientActiveTexture(GL_TEXTURE0);
+            glDisableClientState(GL_TEXTURE_COORD_ARRAY);
+        }
+        else if ((*it).second.vertexType == VERTEX_TYPE_COL)
+        {
+            glDisableClientState(GL_VERTEX_ARRAY);
+            glDisableClientState(GL_COLOR_ARRAY);
+        }
+
+        glBindBuffer(GL_ARRAY_BUFFER, 0);
+        glDisable(GL_VERTEX_ARRAY);
+    }
+    else
+    {
+        glCallList(objectId);
+    }
+}
+
+void CGLDevice::DestroyStaticObject(unsigned int objectId)
+{
+    if (m_useVbo)
+    {
+        auto it = m_vboObjects.find(objectId);
+        if (it == m_vboObjects.end())
+            return;
+
+        glDeleteBuffers(1, &(*it).second.bufferId);
+
+        m_vboObjects.erase(it);
+    }
+    else
+    {
+        glDeleteLists(objectId, 1);
+    }
+}
+
 bool InPlane(Math::Vector normal, float originPlane, Math::Vector center, float radius)
 {
     float distance = originPlane + Math::DotProduct(normal, center);
diff --git a/src/graphics/opengl/gldevice.h b/src/graphics/opengl/gldevice.h
index 87c1247..adae41b 100644
--- a/src/graphics/opengl/gldevice.h
+++ b/src/graphics/opengl/gldevice.h
@@ -27,6 +27,7 @@
 #include <string>
 #include <vector>
 #include <set>
+#include <map>
 
 
 // Graphics module namespace
@@ -84,6 +85,9 @@ public:
 
     void ConfigChanged(const GLDeviceConfig &newConfig);
 
+    void SetUseVbo(bool useVbo);
+    bool GetUseVbo();
+
     virtual void BeginScene();
     virtual void EndScene();
 
@@ -119,14 +123,18 @@ public:
 
     virtual void SetTextureStageWrap(int index, Gfx::TexWrapMode wrapS, Gfx::TexWrapMode wrapT);
 
-    //! Renders primitive composed of vertices with single texture
     virtual void DrawPrimitive(PrimitiveType type, const Vertex *vertices    , int vertexCount,
                                Color color = Color(1.0f, 1.0f, 1.0f, 1.0f));
-    //! Renders primitive composed of vertices with multitexturing (2 textures)
     virtual void DrawPrimitive(PrimitiveType type, const VertexTex2 *vertices, int vertexCount,
                                Color color = Color(1.0f, 1.0f, 1.0f, 1.0f));
     virtual void DrawPrimitive(PrimitiveType type, const VertexCol *vertices , int vertexCount);
 
+    virtual unsigned int CreateStaticObject(PrimitiveType primitiveType, const Vertex* vertices, int vertexCount);
+    virtual unsigned int CreateStaticObject(PrimitiveType primitiveType, const VertexTex2* vertices, int vertexCount);
+    virtual unsigned int CreateStaticObject(PrimitiveType primitiveType, const VertexCol* vertices, int vertexCount);
+    virtual void DrawStaticObject(unsigned int objectId);
+    virtual void DestroyStaticObject(unsigned int objectId);
+
     virtual int ComputeSphereVisibility(const Math::Vector &center, float radius);
 
     virtual void SetRenderState(RenderState state, bool enabled);
@@ -200,6 +208,30 @@ private:
 
     //! Set of all created textures
     std::set<Texture> m_allTextures;
+
+    //! Type of vertex structure
+    enum VertexType
+    {
+        VERTEX_TYPE_NORMAL,
+        VERTEX_TYPE_TEX2,
+        VERTEX_TYPE_COL,
+    };
+
+    //! Info about static VBO buffers
+    struct VboObjectInfo
+    {
+        PrimitiveType primitiveType;
+        unsigned int bufferId;
+        VertexType vertexType;
+        int vertexCount;
+    };
+
+    //! Whether to use VBOs or display lists
+    bool m_useVbo;
+    //! Map of saved VBO objects
+    std::map<unsigned int, VboObjectInfo> m_vboObjects;
+    //! Last ID of VBO object
+    unsigned int m_lastVboId;
 };