#include <stdexcept>
+#include "arb_uniform_buffer_object.h"
#include "arb_vertex_buffer_object.h"
-#include "extension.h"
#include "buffer.h"
+#include "extension.h"
+#include "misc.h"
using namespace std;
namespace Msp {
namespace GL {
-const Buffer *Buffer::bound[4] = { 0, 0, 0, 0 };
+const Buffer *Buffer::bound[5] = { 0, 0, 0, 0, 0 };
Buffer::Buffer(BufferType t):
type(t),
- usage(STATIC_DRAW)
+ usage(STATIC_DRAW),
+ size(0)
{
- static RequireExtension _req_vbo("GL_ARB_vertex_buffer_object");
- if(type==PIXEL_PACK_BUFFER || type==PIXEL_UNPACK_BUFFER)
- static RequireExtension _req_pbo("GL_ARB_pixel_buffer_object");
+ require_buffer_type(type);
glGenBuffersARB(1, &id);
}
glDeleteBuffersARB(1, &id);
}
+void Buffer::require_buffer_type(BufferType type)
+{
+ static RequireExtension _req_vbo("GL_ARB_vertex_buffer_object");
+ if(type==PIXEL_PACK_BUFFER || type==PIXEL_UNPACK_BUFFER)
+ static RequireExtension _req_pbo("GL_ARB_pixel_buffer_object");
+ else if(type==UNIFORM_BUFFER)
+ static RequireExtension _req_ubo("GL_ARB_uniform_buffer_object");
+}
+
void Buffer::set_usage(BufferUsage u)
{
usage = u;
}
-void Buffer::data(unsigned size, const void *d)
+void Buffer::data(unsigned sz, const void *d)
{
const Buffer *old = current(type);
bind();
- glBufferDataARB(type, size, d, usage);
+ glBufferDataARB(type, sz, d, usage);
+ size = sz;
restore(old, type);
}
-void Buffer::sub_data(unsigned offset, unsigned size, const void *d)
+void Buffer::sub_data(unsigned off, unsigned sz, const void *d)
{
const Buffer *old = current(type);
bind();
- glBufferSubDataARB(type, offset, size, d);
+ glBufferSubDataARB(type, off, sz, d);
restore(old, type);
}
+BufferRange *Buffer::create_range(unsigned s, unsigned o)
+{
+ return new BufferRange(*this, s, o);
+}
+
void Buffer::bind_to(BufferType t) const
{
- const Buffer *&ptr = binding(t);
- if(ptr!=this)
- {
+ if(t!=type)
+ require_buffer_type(t);
+ if(set_current(t, this))
glBindBufferARB(t, id);
- ptr = this;
- }
}
void Buffer::unbind_from(BufferType type)
{
- const Buffer *&ptr = binding(type);
- if(ptr)
- {
+ if(set_current(type, 0))
glBindBufferARB(type, 0);
- ptr = 0;
- }
}
const Buffer *&Buffer::binding(BufferType type)
case ELEMENT_ARRAY_BUFFER: return bound[1];
case PIXEL_PACK_BUFFER: return bound[2];
case PIXEL_UNPACK_BUFFER: return bound[3];
+ case UNIFORM_BUFFER: return bound[4];
default: throw invalid_argument("Buffer::binding");
}
}
+bool Buffer::set_current(BufferType type, const Buffer *buf)
+{
+ const Buffer *&ptr = binding(type);
+ if(ptr==buf)
+ return false;
+
+ ptr = buf;
+ return true;
+}
+
void Buffer::restore(const Buffer *buf, BufferType type)
{
if(buf!=current(type))
}
}
+
+vector<const BufferRange *> BufferRange::bound_uniform;
+
+BufferRange::BufferRange(Buffer &b, unsigned o, unsigned s):
+ buffer(b),
+ offset(o),
+ size(s)
+{
+ if(o>buffer.get_size() || o+s>buffer.get_size())
+ throw out_of_range("BufferRange::BufferRange");
+}
+
+void BufferRange::data(const void *d)
+{
+ buffer.sub_data(offset, size, d);
+}
+
+void BufferRange::bind_to(BufferType t, unsigned i)
+{
+ if(t!=buffer.type)
+ Buffer::require_buffer_type(t);
+ // Intentionally using bitwise | to avoid short-circuiting
+ if(Buffer::set_current(t, &buffer) | set_current(t, i, this))
+ glBindBufferRange(t, i, buffer.id, offset, size);
+}
+
+void BufferRange::unbind_from(BufferType t, unsigned i)
+{
+ if(set_current(t, i, 0))
+ {
+ Buffer::set_current(t, 0);
+ glBindBufferBase(t, i, 0);
+ }
+}
+
+const BufferRange *&BufferRange::binding(BufferType type, unsigned index)
+{
+ if(type==UNIFORM_BUFFER)
+ {
+ if(index>=get_n_uniform_buffer_bindings())
+ throw out_of_range("Buffer::binding");
+ if(bound_uniform.size()<=index)
+ bound_uniform.resize(index+1);
+ return bound_uniform[index];
+ }
+ else
+ throw invalid_argument("Buffer::binding");
+}
+
+bool BufferRange::set_current(BufferType type, unsigned index, const BufferRange *buf)
+{
+ const BufferRange *&ptr = binding(type, index);
+ if(ptr==buf)
+ return false;
+
+ ptr = buf;
+ return true;
+}
+
+unsigned BufferRange::get_n_uniform_buffer_bindings()
+{
+ static unsigned count = get_i(GL_MAX_UNIFORM_BUFFER_BINDINGS);
+ return count;
+}
+
+unsigned BufferRange::get_uniform_buffer_alignment()
+{
+ static unsigned align = get_i(GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT);
+ return align;
+}
+
} // namespace GL
} // namespace Msp