Removed indices storing from VBO_ITEM as they are always consecutive numbers....

Removed indices storing from VBO_ITEM as they are always consecutive numbers. Removed storing pointers to VBO_ITEMs that have to be drawn - instead they are memcpied to mapped GPU memory.
Some functions of VBO_ITEM became inline.

common/gal/opengl/opengl_gal.cpp

@@ -414,9 +414,19 @@ void OPENGL_GAL::BeginDrawing()
     if( vboNeedsUpdate )
         rebuildVbo();
 
-    // Clear indices buffer
-    itemsToDraw.clear();
-    itemsToDrawSize = 0;
+    // Number of vertices to be drawn
+    indicesSize = 0;
+
+    glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, curVboIndId );
+    // Discard old buffer, so we can use it again
+    glBufferData( GL_ELEMENT_ARRAY_BUFFER, vboSize * VBO_ITEM::IndByteSize, NULL, GL_STREAM_DRAW );
+
+    // Map the GPU memory, so we can store indices that are going to be drawn
+    indicesPtr = static_cast<GLuint*>( glMapBuffer( GL_ELEMENT_ARRAY_BUFFER, GL_WRITE_ONLY ) );
+    if( indicesPtr == NULL )
+    {
+        wxLogError( wxT( "Could not map GPU memory" ) );
+    }
 }
 
 
@@ -473,6 +483,11 @@ void OPENGL_GAL::EndDrawing()
     // TODO Checking if we are using right VBOs, in other case do the binding.
     // Right now there is only one VBO, so there is no problem.
 
+    if( !glUnmapBuffer( GL_ELEMENT_ARRAY_BUFFER ) )
+    {
+        wxLogError( wxT( "Unmapping indices buffer failed" ) );
+    }
+
     // Prepare buffers
     glEnableClientState( GL_VERTEX_ARRAY );
     glEnableClientState( GL_COLOR_ARRAY );
@@ -492,28 +507,7 @@ void OPENGL_GAL::EndDrawing()
                                VBO_ITEM::VertByteSize, (GLvoid*) VBO_ITEM::ShaderByteOffset );
     }
 
-    glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, curVboIndId );
-    GLuint* indicesPtr = static_cast<GLuint*>( glMapBuffer( GL_ELEMENT_ARRAY_BUFFER, GL_WRITE_ONLY ) );
-
-    if( indicesPtr == NULL )
-    {
-        wxLogError( wxT( "Could not map GPU memory" ) );
-    }
-
-    // Copy indices of items that should be drawn to GPU memory
-    std::list<VBO_ITEM*>::const_iterator it, end;
-    for( it = itemsToDraw.begin(), end = itemsToDraw.end(); it != end; ++it )
-    {
-        memcpy( indicesPtr, (*it)->GetIndices(), (*it)->GetSize() * VBO_ITEM::IndByteSize );
-        indicesPtr += (*it)->GetSize() * VBO_ITEM::IndStride;
-    }
-
-    if( !glUnmapBuffer( GL_ELEMENT_ARRAY_BUFFER ) )
-    {
-        wxLogError( wxT( "Unmapping indices buffer failed" ) );
-    }
-
-    glDrawElements( GL_TRIANGLES, itemsToDrawSize, GL_UNSIGNED_INT, (GLvoid*) 0 );
+    glDrawElements( GL_TRIANGLES, indicesSize, GL_UNSIGNED_INT, (GLvoid*) 0 );
     glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, 0 );
     glBindBuffer( GL_ARRAY_BUFFER, 0 );
 
@@ -1704,8 +1698,13 @@ void OPENGL_GAL::DeleteGroup( int aGroupNumber )
 
 void OPENGL_GAL::DrawGroup( int aGroupNumber )
 {
-    itemsToDraw.push_back( vboItems[aGroupNumber] );
-    itemsToDrawSize += vboItems[aGroupNumber]->GetSize();
+    int size = vboItems[aGroupNumber]->GetSize();
+    int offset = vboItems[aGroupNumber]->GetOffset();
+
+    // Copy indices of items that should be drawn to GPU memory
+    for( int i = offset; i < offset + size; *indicesPtr++ = i++ );
+
+    indicesSize += size;
 }
 
 

common/gal/opengl/vbo_item.cpp

@@ -34,7 +34,6 @@ using namespace KiGfx;
 
 VBO_ITEM::VBO_ITEM() :
         m_vertices( NULL ),
-        m_indices( NULL ),
         m_offset( 0 ),
         m_size( 0 ),
         m_isDirty( true ),
@@ -56,17 +55,10 @@ VBO_ITEM::~VBO_ITEM()
         std::list<VBO_VERTEX*>::const_iterator v_it, v_end;
         for( v_it = m_vertBlocks.begin(), v_end = m_vertBlocks.end(); v_it != v_end; ++v_it )
             delete[] *v_it;
-
-        std::list<GLuint*>::const_iterator i_it, i_end;
-        for( i_it = m_indBlocks.begin(), i_end = m_indBlocks.end(); i_it != i_end; ++i_it )
-            delete[] *i_it;
     }
 
     if( m_vertices )
         delete m_vertices;
-
-    if( m_indices )
-        delete m_indices;
 }
 
 
@@ -100,10 +92,6 @@ void VBO_ITEM::PushVertex( const GLfloat* aVertex )
     // Move to the next free space
     m_vertPtr++;
 
-    // Add the new index
-    *m_indPtr = m_offset + m_size;
-    m_indPtr++;
-
     m_size++;
     m_isDirty = true;
     m_spaceLeft--;
@@ -128,50 +116,6 @@ GLfloat* VBO_ITEM::GetVertices()
 }
 
 
-GLuint* VBO_ITEM::GetIndices()
-{
-    if( m_isDirty )
-        prepareFinal();
-
-    return m_indices;
-}
-
-
-int VBO_ITEM::GetSize() const
-{
-    return m_size;
-}
-
-
-void VBO_ITEM::SetOffset( int aOffset )
-{
-    if( m_offset == aOffset )
-        return;
-
-    int delta = aOffset - m_offset;
-
-    // Change offset for all the stored indices
-    for( int i = 0; i < m_size; ++i )
-    {
-        m_indices += delta;
-    }
-
-    m_offset = aOffset;
-}
-
-
-int VBO_ITEM::GetOffset() const
-{
-    return m_offset;
-}
-
-
-void VBO_ITEM::SetTransformMatrix( const glm::mat4* aMatrix )
-{
-    m_transform = aMatrix;
-}
-
-
 void VBO_ITEM::ChangeColor( const COLOR4D& aColor )
 {
     if( m_isDirty )
@@ -191,31 +135,12 @@ void VBO_ITEM::ChangeColor( const COLOR4D& aColor )
 }
 
 
-void VBO_ITEM::UseColor( const COLOR4D& aColor )
-{
-    m_color[0] = aColor.r;
-    m_color[1] = aColor.g;
-    m_color[2] = aColor.b;
-    m_color[3] = aColor.a;
-}
-
-
-void VBO_ITEM::UseShader( const GLfloat* aShader )
-{
-    memcpy( m_shader, aShader, ShaderByteSize );
-}
-
-
 void VBO_ITEM::useNewBlock()
 {
     VBO_VERTEX* newVertBlock = new VBO_VERTEX[BLOCK_SIZE];
-    GLuint*     newIndBlock  = new GLuint[BLOCK_SIZE];
 
     m_vertPtr = newVertBlock;
-    m_indPtr  = newIndBlock;
-
     m_vertBlocks.push_back( newVertBlock );
-    m_indBlocks.push_back( newIndBlock );
 
     m_spaceLeft = BLOCK_SIZE;
 }
@@ -243,25 +168,5 @@ void VBO_ITEM::prepareFinal()
     // In the last block we need to copy only used vertices
     memcpy( vertPtr, *v_it, ( BLOCK_SIZE - m_spaceLeft ) * VertByteSize );
 
-    if( m_indices )
-        delete m_indices;
-
-    // Allocate memory that would store all of indices
-    m_indices = new GLuint[m_size * IndStride];
-    // Set the pointer that will move along the buffer
-    GLuint* indPtr = m_indices;
-
-    // Copy blocks of indices one after another to m_indices
-    std::list<GLuint*>::const_iterator i_it;
-    for( i_it = m_indBlocks.begin(); *i_it != m_indBlocks.back(); ++i_it )
-    {
-        memcpy( indPtr, *i_it, BLOCK_SIZE * IndByteSize );
-        delete[] *i_it;
-        indPtr += ( BLOCK_SIZE * IndStride );
-    }
-
-    // In the last block we need to copy only used indices
-    memcpy( indPtr, *i_it, ( BLOCK_SIZE - m_spaceLeft ) * IndByteSize );
-
     m_isDirty = false;
 }

include/gal/opengl/opengl_gal.h

@@ -353,9 +353,8 @@ private:
     bool                  vboNeedsUpdate;         ///< Flag indicating if VBO should be rebuilt
     glm::mat4             transform;              ///< Current transformation matrix
     std::stack<glm::mat4> transformStack;         ///< Stack of transformation matrices
-    std::list<VBO_ITEM*>  itemsToDraw;            ///< Stores items that are going to be
-                                                  ///< drawn in the current frame
-    int                   itemsToDrawSize;        ///< Number of indices to be drawn
+    int                   indicesSize;            ///< Number of indices to be drawn
+    GLuint*               indicesPtr;             ///< Pointer to mapped GPU memory
 
     double                curvePoints[12];        ///< Coefficients for curves
     // FIXME to be removed:

include/gal/opengl/vbo_item.h

@@ -45,8 +45,7 @@ typedef struct VBO_VERTEX
     GLfloat x, y, z;        // Coordinates
     GLfloat r, g, b, a;     // Color
     GLfloat shader[4];      // Shader type & params
-} VBO_VERTEX_DATA;
-
+} VBO_VERTEX;
 
 class VBO_ITEM
 {
@@ -81,33 +80,36 @@ public:
      */
     GLfloat* GetVertices();
 
-    /**
-     * Function GetIndices()
-     * Returns a pointer to the array containing all indices of vertices.
-     * @return Pointer to indices.
-     */
-    GLuint* GetIndices();
 
     /**
      * Function GetSize()
      * Returns information about number of vertices stored.
      * @param Amount of vertices.
      */
-    int  GetSize() const;
+    inline int GetSize() const
+    {
+        return m_size;
+    }
 
     /**
      * Function SetOffset()
      * Sets data offset in the VBO.
      * @param aOffset is the offset expressed as a number of vertices.
      */
-    void SetOffset( int aOffset );
+    void SetOffset( int aOffset )
+    {
+        m_offset = aOffset;
+    }
 
     /**
      * Function GetOffset()
      * Returns data offset in the VBO.
      * @return Data offset expressed as a number of vertices.
      */
-    int  GetOffset() const;
+    inline int GetOffset() const
+    {
+        return m_offset;
+    }
 
     /**
      * Function SetTransformMatrix()
@@ -116,7 +118,10 @@ public:
      * @param aMatrix is the new transform matrix or NULL if you do not want to use transformation
      * matrix.
      */
-    void SetTransformMatrix( const glm::mat4* aMatrix );
+    void SetTransformMatrix( const glm::mat4* aMatrix )
+    {
+        m_transform = aMatrix;
+    }
 
     /**
      * Function ChangeColor()
@@ -130,18 +135,37 @@ public:
      * Sets color used for all added vertices.
      * @param aColor is the color used for added vertices.
      */
-    void UseColor( const COLOR4D& aColor );
+    void UseColor( const COLOR4D& aColor )
+    {
+        m_color[0] = aColor.r;
+        m_color[1] = aColor.g;
+        m_color[2] = aColor.b;
+        m_color[3] = aColor.a;
+    }
 
     /**
      * Function UseShader()
      * Sets shader and its parameters used for all added vertices.
      * @param aShader is the array that contains shader number followed by its parameters.
      */
-    void UseShader( const GLfloat* aShader );
+    inline void UseShader( const GLfloat* aShader )
+    {
+        for( int i = 0; i < ShaderStride; ++i )
+        {
+            m_shader[i] = aShader[i];
+        }
+    }
+
+
+    inline void FreeVerticesData()
+    {
+        if( m_vertices && !m_isDirty )
+        {
+            delete[] m_vertices;
+            m_vertices = NULL;
+        }
+    }
 
-    ///< Functions for getting VBO ids.
-    //void SetVbo( int aVboId );
-    //int  GetVbo() const;
 
     ///< Data organization information for vertices {X,Y,Z,R,G,B,A} (@see VBO_VERTEX).
     static const int VertByteSize       = sizeof(VBO_VERTEX);
@@ -164,26 +188,22 @@ public:
     static const int ShaderByteSize     = sizeof(VBO_VERTEX().shader);
     static const int ShaderStride       = ShaderByteSize / sizeof(GLfloat);
 
-    static const int IndStride          = 1;
-    static const int IndByteSize        = IndStride * sizeof(GLuint);
+    static const int IndByteSize        = sizeof(GLuint);
 
 private:
     ///< Contains vertices coordinates and colors.
     ///< Packed by 7 floats for each vertex: {X, Y, Z, R, G, B, A}
     GLfloat*                m_vertices;
 
-    ///< Indices of vertices
-    GLuint*                 m_indices;
-
     ///< Lists of data blocks storing vertices
     std::list<VBO_VERTEX*>  m_vertBlocks;
-    std::list<GLuint*>      m_indBlocks;
+
     ///< Pointers to current blocks that should be used for storing data
     VBO_VERTEX*             m_vertPtr;
-    GLuint*                 m_indPtr;
+
     ///< How many vertices can be stored in the current buffer
     int                     m_spaceLeft;
-    ///< Number of vertices & indices stored in a single block
+    ///< Number of vertices stored in a single block
     static const int        BLOCK_SIZE = 256;
     ///< Creates a new block for storing vertices data
     void                    useNewBlock();