From 0e27dc6c206c1385da3b5f9d018eb5f07d4ec9e9 Mon Sep 17 00:00:00 2001
From: gelder <gelder>
Date: Wed, 20 Jun 2012 17:11:17 -0700
Subject: [PATCH] Updates for correct complilation with glew found during
 Presto integration, and change to vertexBuffer ot avoid dynamic cast issues
 in Presto.

---
 opensubdiv/osd/vertexBuffer.cpp | 79 +++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 opensubdiv/osd/vertexBuffer.cpp

diff --git a/opensubdiv/osd/vertexBuffer.cpp b/opensubdiv/osd/vertexBuffer.cpp
new file mode 100644
index 00000000..c3892d1f
--- /dev/null
+++ b/opensubdiv/osd/vertexBuffer.cpp
@@ -0,0 +1,79 @@
+#include "../version.h"
+
+#include <GL/glew.h>
+
+#include "vertexBuffer.h"
+
+#include <GL/gl.h>
+#include <GL/glext.h>
+
+#include <iostream>
+
+namespace OpenSubdiv {
+namespace OPENSUBDIV_VERSION {
+
+OsdVertexBuffer::~OsdVertexBuffer()
+{
+}
+
+OsdGpuVertexBuffer::OsdGpuVertexBuffer(int numElements, int numVertices) :
+    OsdVertexBuffer(numElements), _vbo(0)
+{
+    int size = numElements * numVertices * sizeof(float);
+    glGenBuffers(1, &_vbo);
+    glBindBuffer(GL_ARRAY_BUFFER, _vbo);
+    glBufferData(GL_ARRAY_BUFFER, size, 0, GL_STREAM_DRAW);
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+}
+
+void
+OsdGpuVertexBuffer::UpdateData(const float *src, int numVertices)
+{
+    glBindBuffer(GL_ARRAY_BUFFER, _vbo);
+    float * pointer = (float*)glMapBuffer(GL_ARRAY_BUFFER, GL_WRITE_ONLY);
+    memcpy(pointer, src, _numElements * numVertices * sizeof(float));
+    glUnmapBuffer(GL_ARRAY_BUFFER);
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+}
+
+OsdGpuVertexBuffer::~OsdGpuVertexBuffer()
+{
+    glDeleteBuffers(1, &_vbo);
+
+}
+
+
+OsdCpuVertexBuffer::OsdCpuVertexBuffer(int numElements, int numVertices) :
+    OsdVertexBuffer(numElements), _cpuVbo(NULL), _vboSize(0), _vbo(0)
+{
+    _vboSize = numElements * numVertices;
+    _cpuVbo = new float[numElements * numVertices];
+}
+
+OsdCpuVertexBuffer::~OsdCpuVertexBuffer()
+{
+    delete [] _cpuVbo;
+    if (_vbo)
+        glDeleteBuffers(1, &_vbo);
+}
+
+void
+OsdCpuVertexBuffer::UpdateData(const float *src, int numVertices)
+{
+    memcpy(_cpuVbo, src, _numElements * numVertices * sizeof(float));
+}
+
+GLuint
+OsdCpuVertexBuffer::GetGpuBuffer()
+{
+    if (!_vbo)
+        glGenBuffers(1, &_vbo);
+    glBindBuffer(GL_ARRAY_BUFFER, _vbo);
+    glBufferData(GL_ARRAY_BUFFER, _vboSize * sizeof(float), _cpuVbo, GL_STREAM_DRAW);
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+    return _vbo;
+}
+
+} // end namespace OPENSUBDIV_VERSION
+} // end namespace OpenSubdiv
+