Add the uniform buffer type

[libs/gl.git] / source / buffer.h

diff --git a/source/buffer.h b/source/buffer.h
index 117f4ea6a1f5d0a699192ebdaffae808e400c68e..bd3a999eeab0d19da7aea2f94b90abae390f4a74 100644 (file)
--- 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
@@ -27,6 +29,8 @@ 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
@@ -34,13 +38,15 @@ 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);
@@ -64,6 +70,8 @@ public:
 
        unsigned get_size() const { return size; }
 
+       BufferRange *create_range(unsigned, unsigned);
+
        /** Binds the buffer in its default slot. */
        void bind() const { bind_to(type); }
 
@@ -81,6 +89,7 @@ private:
        static void restore(const Buffer *, BufferType);
 };
 
+
 /**
 An adaptor for Buffer to make it compatible with Bind.
 */
@@ -98,6 +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