Added automatic batching to improve performances

Moved the ConvertCoords function from RenderWindow to RenderTarget

git-svn-id: https://sfml.svn.sourceforge.net/svnroot/sfml/branches/sfml2@1221 4e206d99-4929-0410-ac5d-dfc041789085

src/SFML/Graphics/GeometryRendererVBO.cpp

@@ -0,0 +1,127 @@
+////////////////////////////////////////////////////////////
+//
+// SFML - Simple and Fast Multimedia Library
+// Copyright (C) 2007-2009 Laurent Gomila (laurent.gom@gmail.com)
+//
+// This software is provided 'as-is', without any express or implied warranty.
+// In no event will the authors be held liable for any damages arising from the use of this software.
+//
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it freely,
+// subject to the following restrictions:
+//
+// 1. The origin of this software must not be misrepresented;
+//    you must not claim that you wrote the original software.
+//    If you use this software in a product, an acknowledgment
+//    in the product documentation would be appreciated but is not required.
+//
+// 2. Altered source versions must be plainly marked as such,
+//    and must not be misrepresented as being the original software.
+//
+// 3. This notice may not be removed or altered from any source distribution.
+//
+////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////
+// Headers
+////////////////////////////////////////////////////////////
+#include <SFML/Graphics/GeometryRendererVBO.hpp>
+
+
+namespace sf
+{
+namespace priv
+{
+////////////////////////////////////////////////////////////
+bool GeometryRendererVBO::IsSupported()
+{
+    EnsureGlewInit();
+
+    return glewIsSupported("GL_ARB_vertex_buffer_object") != 0;
+}
+
+
+////////////////////////////////////////////////////////////
+GeometryRendererVBO::GeometryRendererVBO() :
+myVertexBufferSize(0),
+myIndexBufferSize (0)
+{
+    EnsureGlewInit();
+
+    // Create the buffers
+    GLCheck(glGenBuffersARB(1, &myVertexBuffer));
+    GLCheck(glGenBuffersARB(1, &myIndexBuffer));
+}
+
+
+////////////////////////////////////////////////////////////
+GeometryRendererVBO::~GeometryRendererVBO()
+{
+    // Free the buffers
+    GLCheck(glDeleteBuffersARB(1, &myVertexBuffer));
+    GLCheck(glDeleteBuffersARB(1, &myIndexBuffer));
+}
+
+
+////////////////////////////////////////////////////////////
+void GeometryRendererVBO::Begin(const float* vertices, std::size_t verticesCount, const unsigned int* indices, std::size_t indicesCount)
+{
+    // Update the vertex buffer data (make it grow if it is not large enough)
+    GLCheck(glBindBufferARB(GL_ARRAY_BUFFER_ARB, myVertexBuffer));
+    if (verticesCount > myVertexBufferSize)
+    {
+        GLCheck(glBufferDataARB(GL_ARRAY_BUFFER_ARB, verticesCount * sizeof(float), vertices, GL_DYNAMIC_DRAW_ARB));
+        myVertexBufferSize = verticesCount;
+    }
+    else
+    {
+        GLCheck(glBufferSubDataARB(GL_ARRAY_BUFFER_ARB, 0, verticesCount * sizeof(float), vertices));
+    }
+
+    // Update the index buffer data (make it grow if it is not large enough)
+    GLCheck(glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, myIndexBuffer));
+    if (indicesCount > myIndexBufferSize)
+    {
+        GLCheck(glBufferDataARB(GL_ELEMENT_ARRAY_BUFFER_ARB, indicesCount * sizeof(unsigned int), indices, GL_DYNAMIC_DRAW_ARB));
+        myIndexBufferSize = indicesCount;
+    }
+    else
+    {
+        GLCheck(glBufferSubDataARB(GL_ELEMENT_ARRAY_BUFFER_ARB, 0, indicesCount * sizeof(unsigned int), indices));
+    }
+
+    static const GLsizei stride  = 8 * sizeof(float);
+    static const float*  pointer = NULL;
+
+    // Setup positions
+    GLCheck(glEnableClientState(GL_VERTEX_ARRAY));
+    GLCheck(glVertexPointer(2, GL_FLOAT, stride, pointer));
+
+    // Setup colors
+    GLCheck(glEnableClientState(GL_COLOR_ARRAY));
+    GLCheck(glColorPointer(4, GL_FLOAT, stride, pointer + 2));
+
+    // Setup texture coordinates
+    GLCheck(glClientActiveTextureARB(GL_TEXTURE0_ARB));
+    GLCheck(glEnableClientState(GL_TEXTURE_COORD_ARRAY));
+    GLCheck(glTexCoordPointer(2, GL_FLOAT, stride, pointer + 6));
+}
+
+
+////////////////////////////////////////////////////////////
+void GeometryRendererVBO::End()
+{
+    // Nothing to do
+}
+
+
+////////////////////////////////////////////////////////////
+void GeometryRendererVBO::RenderTriangles(std::size_t start, std::size_t count)
+{
+    static const unsigned int* pointer = NULL;
+    GLCheck(glDrawElements(GL_TRIANGLES, count, GL_UNSIGNED_INT, pointer + start));
+}
+
+} // namespace priv
+
+} // namespace sf