X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fbuffer.h;h=6f0a9708e18069485460587d3295b63aaf6055b1;hb=ab83db6f1e31d44ced585119a57fd10896e469cb;hp=5e3cd29a4162c124a3b259f419cd9a558760d3db;hpb=f14435e58bfa0fa697a06ba9a454bb30cd37d9d8;p=libs%2Fgl.git

diff --git a/source/buffer.h b/source/buffer.h
index 5e3cd29a..6f0a9708 100644
--- a/source/buffer.h
+++ b/source/buffer.h
@@ -1,6 +1,7 @@
 #ifndef MSP_GL_BUFFER_H_
 #define MSP_GL_BUFFER_H_
 
+#include <vector>
 #include "gl.h"
 
 namespace Msp {
@@ -11,7 +12,8 @@ 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
+	PIXEL_UNPACK_BUFFER  = GL_PIXEL_UNPACK_BUFFER_ARB,
+	UNIFORM_BUFFER       = GL_UNIFORM_BUFFER
 };
 
 enum BufferUsage
@@ -27,26 +29,31 @@ enum BufferUsage
 	DYNAMIC_COPY = GL_DYNAMIC_COPY_ARB
 };
 
+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:
 	/** Sets the usage hint of the buffer.  It will take effect the next time
@@ -61,6 +68,10 @@ public:
 	not be changed with this call. */
 	void sub_data(unsigned, unsigned, const void *);
 
+	unsigned get_size() const { return size; }
+
+	BufferRange *create_range(unsigned, unsigned);
+
 	/** Binds the buffer in its default slot. */
 	void bind() const { bind_to(type); }
 
@@ -74,9 +85,11 @@ public:
 	static void unbind_from(BufferType);
 private:
 	static const Buffer *&binding(BufferType);
+	static bool set_current(BufferType, const Buffer *);
 	static void restore(const Buffer *, BufferType);
 };
 
+
 /**
 An adaptor for Buffer to make it compatible with Bind.
 */
@@ -94,6 +107,36 @@ public:
 	static void unbind() { Buffer::unbind_from(T); }
 };
 
+
+/**
+A proxy for a subset of a buffer.  Can be bound for use with uniform blocks.
+*/
+class BufferRange
+{
+private:
+	Buffer &buffer;
+	unsigned offset;
+	unsigned size;
+
+	static std::vector<const BufferRange *> bound_uniform;
+
+public:
+	BufferRange(Buffer &, unsigned, unsigned);
+
+	void data(const void *);
+
+	void bind_to(BufferType, unsigned);
+
+	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();
+};
+
 } // namespace GL
 } // namespace Msp