X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=blobdiff_plain;f=source%2Fbuffer.h;h=cc5e58741c141f1fd5910e1abda23ec68a650a39;hp=5e3cd29a4162c124a3b259f419cd9a558760d3db;hb=bec07999d95b76f4b47cffcc564d0cd0afc0435e;hpb=f14435e58bfa0fa697a06ba9a454bb30cd37d9d8

diff --git a/source/buffer.h b/source/buffer.h
index 5e3cd29a..cc5e5874 100644
--- a/source/buffer.h
+++ b/source/buffer.h
@@ -1,66 +1,116 @@
 #ifndef MSP_GL_BUFFER_H_
 #define MSP_GL_BUFFER_H_
 
+#include <stdexcept>
+#include <string>
+#include <vector>
+#include <msp/core/attributes.h>
 #include "gl.h"
+#include <msp/gl/extensions/arb_pixel_buffer_object.h>
+#include <msp/gl/extensions/arb_vertex_buffer_object.h>
+#include <msp/gl/extensions/arb_uniform_buffer_object.h>
+#include <msp/gl/extensions/oes_mapbuffer.h>
 
 namespace Msp {
 namespace GL {
 
+class buffer_too_small: public std::logic_error
+{
+public:
+	buffer_too_small(const std::string &w): std::logic_error(w) { }
+	virtual ~buffer_too_small() throw() { }
+};
+
 enum BufferType
 {
-	ARRAY_BUFFER         = GL_ARRAY_BUFFER_ARB,
-	ELEMENT_ARRAY_BUFFER = GL_ELEMENT_ARRAY_BUFFER_ARB,
-	PIXEL_PACK_BUFFER    = GL_PIXEL_PACK_BUFFER_ARB,
-	PIXEL_UNPACK_BUFFER  = GL_PIXEL_UNPACK_BUFFER_ARB
+	ARRAY_BUFFER         = GL_ARRAY_BUFFER,
+	ELEMENT_ARRAY_BUFFER = GL_ELEMENT_ARRAY_BUFFER,
+	PIXEL_PACK_BUFFER    = GL_PIXEL_PACK_BUFFER,
+	PIXEL_UNPACK_BUFFER  = GL_PIXEL_UNPACK_BUFFER,
+	UNIFORM_BUFFER       = GL_UNIFORM_BUFFER
 };
 
 enum BufferUsage
 {
-	STREAM_DRAW  = GL_STREAM_DRAW_ARB,
-	STREAM_READ  = GL_STREAM_READ_ARB,
-	STREAM_COPY  = GL_STREAM_COPY_ARB,
-	STATIC_DRAW  = GL_STATIC_DRAW_ARB,
-	STATIC_READ  = GL_STATIC_READ_ARB,
-	STATIC_COPY  = GL_STATIC_COPY_ARB,
-	DYNAMIC_DRAW = GL_DYNAMIC_DRAW_ARB,
-	DYNAMIC_READ = GL_DYNAMIC_READ_ARB,
-	DYNAMIC_COPY = GL_DYNAMIC_COPY_ARB
+	STREAM_DRAW  = GL_STREAM_DRAW,
+	STREAM_READ  = GL_STREAM_READ,
+	STREAM_COPY  = GL_STREAM_COPY,
+	STATIC_DRAW  = GL_STATIC_DRAW,
+	STATIC_READ  = GL_STATIC_READ,
+	STATIC_COPY  = GL_STATIC_COPY,
+	DYNAMIC_DRAW = GL_DYNAMIC_DRAW,
+	DYNAMIC_READ = GL_DYNAMIC_READ,
+	DYNAMIC_COPY = GL_DYNAMIC_COPY
+};
+
+enum BufferAccess
+{
+	READ_ONLY = GL_READ_ONLY,
+	WRITE_ONLY = GL_WRITE_ONLY,
+	READ_WRITE = GL_READ_WRITE
 };
 
+class BufferRange;
+
 /**
 A buffer for storing data in GL memory.  Putting vertex and index data in
-buffers can improve rendering performance.  The VertexArray and Mesh classes
-contain built-in support for buffers.
+buffers can improve rendering performance.  The VertexArray, Mesh and
+UniformBlock classes contain built-in support for buffers.
 */
 class Buffer
 {
+	friend class BufferRange;
+
 private:
 	BufferType type;
-	BufferUsage usage;
 	unsigned id;
+	unsigned size;
 
-	static const Buffer *bound[4];
+	static const Buffer *bound[5];
 
 public:
 	Buffer(BufferType);
 	~Buffer();
 
 private:
-	const Buffer *maybe_bind() const;
+	static void require_buffer_type(BufferType);
 
 public:
+	/** Returns the OpenGL ID of the buffer.  For internal use only. */
+	unsigned get_id() const { return id; }
+
+	/** Returns the default binding type for the buffer. */
+	BufferType get_type() const { return type; }
+
+	/** Defines the storage size of the buffer.  Must be called before data can
+	be uploaded.  Storage cannot be changed once set. */
+	void storage(unsigned);
+
 	/** Sets the usage hint of the buffer.  It will take effect the next time
 	the buffer's contents are defined. */
-	void set_usage(BufferUsage);
+	DEPRECATED void set_usage(BufferUsage);
 
 	/** Uploads data into the buffer, completely replacing any previous
-	contents. */
-	void data(unsigned, const void *);
+	contents.  Storage must be defined beforehand.  The data must have size
+	matching the defined storage. */
+	void data(const void *);
 
-	/** Overwrites part of the buffer data with new data.  The buffer size can
-	not be changed with this call. */
+	DEPRECATED void data(unsigned, const void *);
+
+	/** Overwrites part of the buffer data with new data.  Storage must be
+	defined beforehand. */
 	void sub_data(unsigned, unsigned, const void *);
 
+	unsigned get_size() const { return size; }
+
+	void require_size(unsigned) const;
+
+	BufferRange *create_range(unsigned, unsigned);
+
+	void *map();
+	DEPRECATED void *map(BufferAccess) { return map(); }
+	bool unmap();
+
 	/** Binds the buffer in its default slot. */
 	void bind() const { bind_to(type); }
 
@@ -70,28 +120,43 @@ public:
 	/** Unbinds the buffer from its default slot. */
 	void unbind() const { unbind_from(type); }
 
-	static const Buffer *current(BufferType t) { return binding(t); }
+	static const Buffer *current(BufferType);
 	static void unbind_from(BufferType);
 private:
 	static const Buffer *&binding(BufferType);
-	static void restore(const Buffer *, BufferType);
+	static bool set_current(BufferType, const Buffer *);
 };
 
+
 /**
-An adaptor for Buffer to make it compatible with Bind.
+A proxy for a subset of a buffer.  Can be bound for use with uniform blocks.
 */
-template<BufferType T>
-class BufferAlias
+class BufferRange
 {
 private:
-	const Buffer &buffer;
+	Buffer &buffer;
+	unsigned offset;
+	unsigned size;
+
+	static std::vector<const BufferRange *> bound_uniform;
 
 public:
-	BufferAlias(const Buffer &b): buffer(b) { }
+	BufferRange(Buffer &, unsigned, unsigned);
+	~BufferRange();
+
+	void data(const void *);
+
+	void bind_to(BufferType, unsigned);
 
-	void bind() const { buffer.bind_to(T); }
-	static const Buffer *current() { return Buffer::current(T); }
-	static void unbind() { Buffer::unbind_from(T); }
+	static const BufferRange *current(BufferType t, unsigned i) { return binding(t, i); }
+	static void unbind_from(BufferType, unsigned);
+private:
+	static const BufferRange *&binding(BufferType, unsigned);
+	static bool set_current(BufferType, unsigned, const BufferRange *);
+
+public:
+	static unsigned get_n_uniform_buffer_bindings();
+	static unsigned get_uniform_buffer_alignment();
 };
 
 } // namespace GL