[Hgengine-cvs] SF.net SVN: hgengine:[426] Mercury2/src

[<cn...@us...>]

Revision: 426
          http://hgengine.svn.sourceforge.net/hgengine/?rev=426&view=rev
Author:   cnlohr
Date:     2009-07-15 04:23:32 +0000 (Wed, 15 Jul 2009)

Log Message:
-----------
Make the VBO able to dirty Vertices so that they can be updated on the 
fly.

Modified Paths:
--------------
    Mercury2/src/MercuryVBO.cpp
    Mercury2/src/MercuryVBO.h

Modified: Mercury2/src/MercuryVBO.cpp
===================================================================
--- Mercury2/src/MercuryVBO.cpp	2009-07-15 04:23:04 UTC (rev 425)
+++ Mercury2/src/MercuryVBO.cpp	2009-07-15 04:23:32 UTC (rev 426)
@@ -14,6 +14,7 @@
 	:MercuryAsset(), m_initiated(false)
 {
 	m_bufferIDs[0] = m_bufferIDs[1] = 0;
+	m_bDirtyIndices = m_bDirtyVertices = 0;
 }
 
 MercuryVBO::~MercuryVBO()
@@ -27,11 +28,18 @@
 	uint8_t numTextures = Texture::NumberActiveTextures();
 	uint16_t stride = sizeof(float)*8;
 	
-	if ( !m_initiated ) InitVBO();
-		
+	if ( !m_initiated )
+		InitVBO();
+
 	if ( this != m_lastVBOrendered )
-	{		
+	{
 		m_lastVBOrendered = this;
+
+		if ( m_bDirtyVertices )
+			UpdateVertices();
+		if( m_bDirtyIndices )
+			UpdateIndices();
+
 		glBindBufferARB(GL_ARRAY_BUFFER_ARB, m_bufferIDs[0]);
 		glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, m_bufferIDs[1]);
 		glVertexPointer(3, GL_FLOAT, stride, BUFFER_OFFSET(sizeof(float)*5));
@@ -58,21 +66,32 @@
 
 void MercuryVBO::InitVBO()
 {
-	glGenBuffersARB(2, m_bufferIDs);
-	
-	//vertex VBO
-	glBindBufferARB(GL_ARRAY_BUFFER_ARB, m_bufferIDs[0]);
-	glBufferDataARB(GL_ARRAY_BUFFER_ARB, m_vertexData.LengthInBytes(), m_vertexData.Buffer(), GL_STATIC_DRAW_ARB);
+	if (!m_bufferIDs[0])
+	{
+		glGenBuffersARB(2, m_bufferIDs);
+	}
 
-	//indices VBO
-	glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, m_bufferIDs[1]);
-	glBufferDataARB(GL_ELEMENT_ARRAY_BUFFER_ARB, m_indexData.LengthInBytes(), m_indexData.Buffer(), GL_STATIC_DRAW_ARB);
-		
+	UpdateIndices();
+	UpdateVertices();
 	glEnableClientState(GL_VERTEX_ARRAY);
 
 	m_initiated = true;
 }
 
+void MercuryVBO::UpdateIndices()
+{
+	glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, m_bufferIDs[1]);
+	glBufferDataARB(GL_ELEMENT_ARRAY_BUFFER_ARB, m_indexData.LengthInBytes(), m_indexData.Buffer(), GL_STATIC_DRAW_ARB);
+	m_bDirtyIndices = 0;
+}
+
+void MercuryVBO::UpdateVertices()
+{
+	glBindBufferARB(GL_ARRAY_BUFFER_ARB, m_bufferIDs[0]);
+	glBufferDataARB(GL_ARRAY_BUFFER_ARB, m_vertexData.LengthInBytes(), m_vertexData.Buffer(), GL_STATIC_DRAW_ARB);
+	m_bDirtyVertices = 0;
+}
+
 void MercuryVBO::AllocateVertexSpace(unsigned int count)
 {
 	m_vertexData.Allocate(count*8);

Modified: Mercury2/src/MercuryVBO.h
===================================================================
--- Mercury2/src/MercuryVBO.h	2009-07-15 04:23:04 UTC (rev 425)
+++ Mercury2/src/MercuryVBO.h	2009-07-15 04:23:32 UTC (rev 426)
@@ -26,13 +26,20 @@
 		short unsigned int * GetIndexHandle() { return &m_indexData[0]; }
 	
 		static void* m_lastVBOrendered;
-		
+
+		void DirtyVertices() { m_bDirtyVertices = 1; }
+		void DirtyIndices() { m_bDirtyIndices = 1; }
 	private:
 		virtual void InitVBO();
 	
 		unsigned int m_bufferIDs[2];
-		bool m_initiated;		
+		bool m_initiated;
+	
+		bool m_bDirtyIndices;
+		bool m_bDirtyVertices;
 
+		void UpdateVertices();
+		void UpdateIndices();
 	protected:
 		AlignedBuffer<float> m_vertexData;
 		AlignedBuffer<uint16_t> m_indexData;


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