1 #ifndef MSP_GL_BUFFER_H_
2 #define MSP_GL_BUFFER_H_
8 #include <msp/gl/extensions/arb_pixel_buffer_object.h>
9 #include <msp/gl/extensions/arb_vertex_buffer_object.h>
10 #include <msp/gl/extensions/arb_uniform_buffer_object.h>
11 #include <msp/gl/extensions/oes_mapbuffer.h>
16 class buffer_too_small: public std::logic_error
19 buffer_too_small(const std::string &w): std::logic_error(w) { }
20 virtual ~buffer_too_small() throw() { }
25 ARRAY_BUFFER = GL_ARRAY_BUFFER,
26 ELEMENT_ARRAY_BUFFER = GL_ELEMENT_ARRAY_BUFFER,
27 PIXEL_PACK_BUFFER = GL_PIXEL_PACK_BUFFER,
28 PIXEL_UNPACK_BUFFER = GL_PIXEL_UNPACK_BUFFER,
29 UNIFORM_BUFFER = GL_UNIFORM_BUFFER
34 STREAM_DRAW = GL_STREAM_DRAW,
35 STREAM_READ = GL_STREAM_READ,
36 STREAM_COPY = GL_STREAM_COPY,
37 STATIC_DRAW = GL_STATIC_DRAW,
38 STATIC_READ = GL_STATIC_READ,
39 STATIC_COPY = GL_STATIC_COPY,
40 DYNAMIC_DRAW = GL_DYNAMIC_DRAW,
41 DYNAMIC_READ = GL_DYNAMIC_READ,
42 DYNAMIC_COPY = GL_DYNAMIC_COPY
47 READ_ONLY = GL_READ_ONLY,
48 WRITE_ONLY = GL_WRITE_ONLY,
49 READ_WRITE = GL_READ_WRITE
55 A buffer for storing data in GL memory. Putting vertex and index data in
56 buffers can improve rendering performance. The VertexArray, Mesh and
57 UniformBlock classes contain built-in support for buffers.
61 friend class BufferRange;
69 static const Buffer *bound[5];
76 static void require_buffer_type(BufferType);
79 /** Returns the OpenGL ID of the buffer. For internal use only. */
80 unsigned get_id() const { return id; }
82 /** Returns the default binding type for the buffer. */
83 BufferType get_type() const { return type; }
85 /** Sets the usage hint of the buffer. It will take effect the next time
86 the buffer's contents are defined. */
87 void set_usage(BufferUsage);
89 /** Uploads data into the buffer, completely replacing any previous
91 void data(unsigned, const void *);
93 /** Overwrites part of the buffer data with new data. The buffer size can
94 not be changed with this call. */
95 void sub_data(unsigned, unsigned, const void *);
97 unsigned get_size() const { return size; }
99 void require_size(unsigned) const;
101 BufferRange *create_range(unsigned, unsigned);
103 void *map(BufferAccess);
106 /** Binds the buffer in its default slot. */
107 void bind() const { bind_to(type); }
109 /** Binds the buffer in an alternate slot. */
110 void bind_to(BufferType) const;
112 /** Unbinds the buffer from its default slot. */
113 void unbind() const { unbind_from(type); }
115 static const Buffer *current(BufferType);
116 static void unbind_from(BufferType);
118 static const Buffer *&binding(BufferType);
119 static bool set_current(BufferType, const Buffer *);
124 A proxy for a subset of a buffer. Can be bound for use with uniform blocks.
133 static std::vector<const BufferRange *> bound_uniform;
136 BufferRange(Buffer &, unsigned, unsigned);
139 void data(const void *);
141 void bind_to(BufferType, unsigned);
143 static const BufferRange *current(BufferType t, unsigned i) { return binding(t, i); }
144 static void unbind_from(BufferType, unsigned);
146 static const BufferRange *&binding(BufferType, unsigned);
147 static bool set_current(BufferType, unsigned, const BufferRange *);
150 static unsigned get_n_uniform_buffer_bindings();
151 static unsigned get_uniform_buffer_alignment();