X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fbuffer.cpp;h=f09268741fc7705e69432c6ee18e5f03edb069ec;hb=ab83db6f1e31d44ced585119a57fd10896e469cb;hp=395057cd90ff4bf61e95a7be7c833fefaa20515f;hpb=f14435e58bfa0fa697a06ba9a454bb30cd37d9d8;p=libs%2Fgl.git

diff --git a/source/buffer.cpp b/source/buffer.cpp
index 395057cd..f0926874 100644
--- a/source/buffer.cpp
+++ b/source/buffer.cpp
@@ -1,17 +1,23 @@
+#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[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);
 }
@@ -21,45 +27,54 @@ Buffer::~Buffer()
 	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)
@@ -70,10 +85,21 @@ 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];
-	default: throw InvalidParameterValue("Invalid buffer type");
+	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))
@@ -85,7 +111,70 @@ void Buffer::restore(const Buffer *buf, BufferType type)
 	}
 }
 
-const Buffer *Buffer::bound[4] = { 0, 0, 0, 0 };
+
+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;
+}
 
 } // namespace GL
 } // namespace Msp