X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=blobdiff_plain;f=source%2Fbuffer.cpp;h=56705b8701b88a00b691bf25725d10042554679a;hp=17ae494f72dc37a0892fdf282af33665d8723c49;hb=bec07999d95b76f4b47cffcc564d0cd0afc0435e;hpb=b617c5d7b5283ad260a77f01e42e6170cabbc03d

diff --git a/source/buffer.cpp b/source/buffer.cpp
index 17ae494f..56705b87 100644
--- a/source/buffer.cpp
+++ b/source/buffer.cpp
@@ -1,72 +1,193 @@
-/* $Id$
-
-This file is part of libmspgl
-Copyright © 2007  Mikko Rasa, Mikkosoft Productions
-Distributed under the LGPL
-*/
-
-#include "arb_vertex_buffer_object.h"
-#include "extension.h"
+#include <stdexcept>
+#include <msp/gl/extensions/arb_buffer_storage.h>
+#include <msp/gl/extensions/arb_direct_state_access.h>
+#include <msp/gl/extensions/arb_map_buffer_range.h>
+#include <msp/strings/format.h>
 #include "buffer.h"
+#include "error.h"
+#include "misc.h"
+#include "vertexsetup.h"
+
+using namespace std;
 
 namespace Msp {
 namespace GL {
 
+const Buffer *Buffer::bound[5] = { 0, 0, 0, 0, 0 };
+BufferType buffer_types[] = { ARRAY_BUFFER, ELEMENT_ARRAY_BUFFER, PIXEL_PACK_BUFFER, PIXEL_UNPACK_BUFFER, UNIFORM_BUFFER };
+
 Buffer::Buffer(BufferType t):
 	type(t),
-	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);
+	if(ARB_direct_state_access)
+		glCreateBuffers(1, &id);
+	else
+		glGenBuffers(1, &id);
 }
 
 Buffer::~Buffer()
 {
-	glDeleteBuffersARB(1, &id);
+	for(unsigned i=0; i<5; ++i)
+		if(bound[i]==this)
+			unbind_from(buffer_types[i]);
+	glDeleteBuffers(1, &id);
 }
 
-void Buffer::bind(BufferType t) const
+void Buffer::require_buffer_type(BufferType type)
 {
-	glBindBufferARB(t, id);
-	binding(t) = this;
+	static Require _req_vbo(ARB_vertex_buffer_object);
+	if(type==PIXEL_PACK_BUFFER || type==PIXEL_UNPACK_BUFFER)
+		static Require _req_pbo(ARB_pixel_buffer_object);
+	else if(type==UNIFORM_BUFFER)
+		static Require _req_ubo(ARB_uniform_buffer_object);
 }
 
-void Buffer::maybe_bind() const
+void Buffer::storage(unsigned sz)
 {
-	if(binding(type)!=this)
-		bind();
+	if(size>0)
+		throw invalid_operation("Buffer::storage");
+	if(sz==0)
+		throw invalid_argument("Buffer::storage");
+
+	size = sz;
+	if(ARB_buffer_storage)
+	{
+		static const int flags = GL_MAP_READ_BIT|GL_MAP_WRITE_BIT|GL_DYNAMIC_STORAGE_BIT;
+		if(ARB_direct_state_access)
+			glNamedBufferStorage(id, size, 0, flags);
+		else
+		{
+			BindRestore _bind(this, type);
+			glBufferStorage(type, size, 0, flags);
+		}
+	}
 }
 
-void Buffer::set_usage(BufferUsage u)
+void Buffer::set_usage(BufferUsage)
 {
-	usage = u;
 }
 
-void Buffer::data(unsigned size, const void *d)
+void Buffer::data(const void *d)
 {
-	maybe_bind();
-	glBufferDataARB(type, size, d, usage);
+	if(size==0)
+		throw invalid_operation("Buffer::data");
+
+	if(ARB_buffer_storage)
+		return sub_data(0, size, d);
+
+	if(ARB_direct_state_access)
+		glNamedBufferData(id, size, d, STATIC_DRAW);
+	else
+	{
+		BindRestore _bind(this, type);
+		glBufferData(type, size, d, STATIC_DRAW);
+	}
 }
 
-void Buffer::sub_data(unsigned offset, unsigned size, const void *d)
+void Buffer::data(unsigned sz, const void *d)
 {
-	maybe_bind();
-	glBufferSubDataARB(type, offset, size, d);
+	if(size==0)
+		storage(sz);
+	else if(sz!=size)
+		throw incompatible_data("Buffer::data");
+
+	data(d);
 }
 
-void Buffer::unbind(BufferType type)
+void Buffer::sub_data(unsigned off, unsigned sz, const void *d)
 {
-	const Buffer *&ptr = binding(type);
-	if(ptr)
+	if(ARB_direct_state_access)
+		glNamedBufferSubData(id, off, sz, d);
+	else
 	{
-		glBindBufferARB(type, 0);
-		ptr = 0;
+		BindRestore _bind(this, type);
+		glBufferSubData(type, off, sz, d);
 	}
 }
 
+void Buffer::require_size(unsigned req_sz) const
+{
+	if(size<req_sz)
+		throw buffer_too_small(format("buffer has %d bytes; %d required", size, req_sz));
+}
+
+BufferRange *Buffer::create_range(unsigned s, unsigned o)
+{
+	return new BufferRange(*this, s, o);
+}
+
+void *Buffer::map()
+{
+	if(ARB_map_buffer_range)
+	{
+		if(ARB_direct_state_access)
+			return glMapNamedBufferRange(id, 0, size, GL_MAP_READ_BIT|GL_MAP_WRITE_BIT);
+		else
+		{
+			BindRestore _bind(this, type);
+			return glMapBufferRange(type, 0, size, GL_MAP_READ_BIT|GL_MAP_WRITE_BIT);
+		}
+	}
+	else if(ARB_direct_state_access)
+		return glMapNamedBuffer(id, GL_READ_WRITE);
+	else if(OES_mapbuffer)
+	{
+		BindRestore _bind(this, type);
+		return glMapBuffer(type, GL_READ_WRITE);
+	}
+	else
+		throw invalid_operation("Buffer::map");
+}
+
+bool Buffer::unmap()
+{
+	// TODO check if it's mapped
+	if(ARB_direct_state_access)
+		return glUnmapNamedBuffer(id);
+	else if(OES_mapbuffer)
+	{
+		BindRestore _bind(this, type);
+		return glUnmapBuffer(type);
+	}
+	else
+		return true;
+}
+
+void Buffer::bind_to(BufferType t) const
+{
+	if(t!=type)
+		require_buffer_type(t);
+	if(t==ELEMENT_ARRAY_BUFFER)
+		if(const VertexSetup *vs = VertexSetup::current())
+		{
+			// Don't change the binding in a vertex array object
+			if(this==vs->get_index_buffer())
+				return;
+			throw invalid_operation("Buffer::bind_to(ELEMENT_ARRAY_BUFFER)");
+		}
+	if(set_current(t, this))
+		glBindBuffer(t, id);
+}
+
+const Buffer *Buffer::current(BufferType t)
+{
+	if(t==ELEMENT_ARRAY_BUFFER)
+		if(const VertexSetup *vs = VertexSetup::current())
+			return vs->get_index_buffer();
+	return binding(t);
+}
+
+void Buffer::unbind_from(BufferType type)
+{
+	if(type==ELEMENT_ARRAY_BUFFER && VertexSetup::current())
+		throw invalid_operation("Buffer::unbind_from(ELEMENT_ARRAY_BUFFER)");
+	if(set_current(type, 0))
+		glBindBuffer(type, 0);
+}
+
 const Buffer *&Buffer::binding(BufferType type)
 {
 	switch(type)
@@ -75,11 +196,101 @@ 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");
 	}
 }
 
-const Buffer *Buffer::bound[4] = { 0, 0, 0, 0 };
+bool Buffer::set_current(BufferType type, const Buffer *buf)
+{
+	const Buffer *&ptr = binding(type);
+	if(ptr==buf)
+		return false;
+
+	ptr = buf;
+	return true;
+}
+
+
+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");
+}
+
+BufferRange::~BufferRange()
+{
+	for(unsigned i=0; i<bound_uniform.size(); ++i)
+		if(bound_uniform[i]==this)
+			unbind_from(UNIFORM_BUFFER, i);
+}
+
+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);
+	if(set_current(t, i, this))
+	{
+		// The buffer gets bound as a side effect
+		Buffer::set_current(t, &buffer);
+		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("BufferRange::binding");
+		if(bound_uniform.size()<=index)
+			bound_uniform.resize(index+1);
+		return bound_uniform[index];
+	}
+	else
+		throw invalid_argument("BufferRange::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