cacd150569
git-svn-id: https://sfml.svn.sourceforge.net/svnroot/sfml/branches/sfml2@1305 4e206d99-4929-0410-ac5d-dfc041789085
128 lines
4.3 KiB
C++
128 lines
4.3 KiB
C++
////////////////////////////////////////////////////////////
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//
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// SFML - Simple and Fast Multimedia Library
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// Copyright (C) 2007-2009 Laurent Gomila (laurent.gom@gmail.com)
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//
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// This software is provided 'as-is', without any express or implied warranty.
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// In no event will the authors be held liable for any damages arising from the use of this software.
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//
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// Permission is granted to anyone to use this software for any purpose,
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// including commercial applications, and to alter it and redistribute it freely,
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// subject to the following restrictions:
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//
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// 1. The origin of this software must not be misrepresented;
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// you must not claim that you wrote the original software.
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// If you use this software in a product, an acknowledgment
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// in the product documentation would be appreciated but is not required.
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//
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// 2. Altered source versions must be plainly marked as such,
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// and must not be misrepresented as being the original software.
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//
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// 3. This notice may not be removed or altered from any source distribution.
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//
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////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////
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// Headers
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////////////////////////////////////////////////////////////
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#include <SFML/Graphics/GeometryRendererVBO.hpp>
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namespace sf
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{
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namespace priv
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{
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////////////////////////////////////////////////////////////
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bool GeometryRendererVBO::IsSupported()
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{
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priv::EnsureGlewInit();
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return GLEW_ARB_vertex_buffer_object != 0;
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}
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////////////////////////////////////////////////////////////
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GeometryRendererVBO::GeometryRendererVBO() :
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myVertexBufferSize(0),
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myIndexBufferSize (0)
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{
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priv::EnsureGlewInit();
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// Create the buffers
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GLCheck(glGenBuffersARB(1, &myVertexBuffer));
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GLCheck(glGenBuffersARB(1, &myIndexBuffer));
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}
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////////////////////////////////////////////////////////////
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GeometryRendererVBO::~GeometryRendererVBO()
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{
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// Free the buffers
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GLCheck(glDeleteBuffersARB(1, &myVertexBuffer));
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GLCheck(glDeleteBuffersARB(1, &myIndexBuffer));
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}
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////////////////////////////////////////////////////////////
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void GeometryRendererVBO::Begin(const float* vertices, std::size_t verticesCount, const Uint32* indices, std::size_t indicesCount)
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{
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// Update the vertex buffer data (make it grow if it is not large enough)
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GLCheck(glBindBufferARB(GL_ARRAY_BUFFER_ARB, myVertexBuffer));
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if (verticesCount > myVertexBufferSize)
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{
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GLCheck(glBufferDataARB(GL_ARRAY_BUFFER_ARB, verticesCount * sizeof(float), vertices, GL_DYNAMIC_DRAW_ARB));
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myVertexBufferSize = verticesCount;
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}
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else
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{
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GLCheck(glBufferSubDataARB(GL_ARRAY_BUFFER_ARB, 0, verticesCount * sizeof(float), vertices));
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}
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// Update the index buffer data (make it grow if it is not large enough)
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GLCheck(glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, myIndexBuffer));
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if (indicesCount > myIndexBufferSize)
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{
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GLCheck(glBufferDataARB(GL_ELEMENT_ARRAY_BUFFER_ARB, indicesCount * sizeof(Uint32), indices, GL_DYNAMIC_DRAW_ARB));
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myIndexBufferSize = indicesCount;
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}
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else
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{
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GLCheck(glBufferSubDataARB(GL_ELEMENT_ARRAY_BUFFER_ARB, 0, indicesCount * sizeof(Uint32), indices));
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}
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static const GLsizei stride = 8 * sizeof(float);
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static const float* pointer = NULL;
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// Setup positions
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GLCheck(glEnableClientState(GL_VERTEX_ARRAY));
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GLCheck(glVertexPointer(2, GL_FLOAT, stride, pointer));
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// Setup colors
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GLCheck(glEnableClientState(GL_COLOR_ARRAY));
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GLCheck(glColorPointer(4, GL_FLOAT, stride, pointer + 2));
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// Setup texture coordinates
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GLCheck(glClientActiveTextureARB(GL_TEXTURE0_ARB));
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GLCheck(glEnableClientState(GL_TEXTURE_COORD_ARRAY));
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GLCheck(glTexCoordPointer(2, GL_FLOAT, stride, pointer + 6));
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}
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////////////////////////////////////////////////////////////
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void GeometryRendererVBO::End()
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{
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// Nothing to do
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}
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////////////////////////////////////////////////////////////
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void GeometryRendererVBO::RenderTriangles(Uint32 start, Uint32 count)
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{
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static const Uint32* pointer = NULL;
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GLCheck(glDrawElements(GL_TRIANGLES, static_cast<GLsizei>(count), GL_UNSIGNED_INT, pointer + start));
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}
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} // namespace priv
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} // namespace sf
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