From 1b3360e1520e6298a08f05569eb7597aea61170b Mon Sep 17 00:00:00 2001
From: yvt <i@yvt.jp>
Date: Sun, 25 Aug 2013 02:37:30 +0900
Subject: [PATCH] Support PBO

---
 Sources/Draw/IGLDevice.h    | 11 +++++++++++
 Sources/Gui/SDLGLDevice.cpp | 33 +++++++++++++++++++++++++++++++++
 Sources/Gui/SDLGLDevice.h   |  3 +++
 3 files changed, 47 insertions(+)

diff --git a/Sources/Draw/IGLDevice.h b/Sources/Draw/IGLDevice.h
index 1b76ecc4..90be2896 100644
--- a/Sources/Draw/IGLDevice.h
+++ b/Sources/Draw/IGLDevice.h
@@ -29,6 +29,7 @@ namespace spades {
 				FloatType,
 				UnsignedShort5551,
 				UnsignedShort1555Rev,
+				UnsignedInt2101010Rev,
 				
 				// State
 				DepthTest,
@@ -88,12 +89,19 @@ namespace spades {
 				// Buffer target
 				ArrayBuffer,
 				ElementArrayBuffer,
+				PixelPackBuffer,
+				PixelUnpackBuffer,
 				
 				// Buffer usage
 				StaticDraw,
 				StreamDraw,
 				DynamicDraw,
 				
+				// Buffer Map access
+				ReadOnly,
+				WriteOnly,
+				ReadWrite,
+				
 				// Texture targets
 				Texture2D,
 				Texture3D,
@@ -243,6 +251,9 @@ namespace spades {
 									   Sizei size,
 									   const void *data) = 0;
 			
+			virtual void *MapBuffer(Enum target, Enum access) = 0;
+			virtual void UnmapBuffer(Enum target) = 0;
+			
 			virtual UInteger GenTexture() = 0;
 			virtual void DeleteTexture(UInteger) = 0;
 			
diff --git a/Sources/Gui/SDLGLDevice.cpp b/Sources/Gui/SDLGLDevice.cpp
index b42d19b4..d0545640 100644
--- a/Sources/Gui/SDLGLDevice.cpp
+++ b/Sources/Gui/SDLGLDevice.cpp
@@ -265,6 +265,7 @@ namespace spades {
 		}
 		
 		IGLDevice::UInteger SDLGLDevice::GenBuffer() {
+			SPADES_MARK_FUNCTION_DEBUG();
 			GLuint i;
 			glGenBuffers(1, &i);
 			CheckError();
@@ -272,16 +273,47 @@ namespace spades {
 		}
 		
 		void SDLGLDevice::DeleteBuffer(UInteger i) {
+			SPADES_MARK_FUNCTION_DEBUG();
 			GLuint v = (GLuint)i;
 			glDeleteBuffers(1, &v);
 			CheckError();
 		}
 		
+		void *SDLGLDevice::MapBuffer(Enum target,
+								   Enum access) {
+			SPADES_MARK_FUNCTION_DEBUG();
+			GLenum acc;
+			switch(access){
+				case draw::IGLDevice::ReadOnly:
+					acc = GL_READ_ONLY;
+					break;
+				case draw::IGLDevice::WriteOnly:
+					acc = GL_WRITE_ONLY;
+					break;
+				case draw::IGLDevice::ReadWrite:
+					acc = GL_READ_WRITE;
+					break;
+				default:
+					SPInvalidEnum("access", access);
+			}
+			void *ret = glMapBuffer(parseBufferTarget(target),
+									acc);
+			CheckError();
+			return ret;
+		}
+		
+		void SDLGLDevice::UnmapBuffer(Enum target) {
+			glUnmapBuffer(parseBufferTarget(target));
+			CheckError();
+		}
+		
 		GLenum SDLGLDevice::parseBufferTarget(spades::draw::IGLDevice::Enum v){
 			SPADES_MARK_FUNCTION_DEBUG();
 			switch(v){
 				case ArrayBuffer: return GL_ARRAY_BUFFER;
 				case ElementArrayBuffer: return GL_ELEMENT_ARRAY_BUFFER;
+				case PixelPackBuffer: return GL_PIXEL_PACK_BUFFER;
+				case PixelUnpackBuffer: return GL_PIXEL_UNPACK_BUFFER;
 				default: SPInvalidEnum("v", v);
 			}
 		}
@@ -391,6 +423,7 @@ namespace spades {
 				case FloatType: return GL_FLOAT;
 				case UnsignedShort5551: return GL_UNSIGNED_SHORT_5_5_5_1;
 				case UnsignedShort1555Rev: return GL_UNSIGNED_SHORT_1_5_5_5_REV;
+				case UnsignedInt2101010Rev: return GL_UNSIGNED_INT_2_10_10_10_REV;
 				default: SPInvalidEnum("v", v);
 			}
 		}
diff --git a/Sources/Gui/SDLGLDevice.h b/Sources/Gui/SDLGLDevice.h
index d804cadf..1ee28888 100644
--- a/Sources/Gui/SDLGLDevice.h
+++ b/Sources/Gui/SDLGLDevice.h
@@ -53,6 +53,9 @@ namespace spades {
 			virtual void DeleteBuffer(UInteger);
 			virtual void BindBuffer(Enum, UInteger);
 			
+			virtual void *MapBuffer(Enum target, Enum access);
+			virtual void UnmapBuffer(Enum target);
+			
 			virtual void BufferData(Enum target,
 									Sizei size,
 									const void *data,