From 5e0b387dc1d5964407c7876daf88caceeebe52f3 Mon Sep 17 00:00:00 2001
From: Michael Fabian 'Xaymar' Dirks <info@xaymar.com>
Date: Fri, 19 Jan 2018 02:59:55 +0100
Subject: [PATCH] gs-vertexbuffer: Functions to directly access internal
 buffers

Skips the previously necessary step to call At(0) and use the pointers stored in GS::Vertex to directly write to the buffers.
---
 source/gs-vertexbuffer.cpp | 22 +++++++++++++++++++++
 source/gs-vertexbuffer.h   | 40 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 62 insertions(+)

diff --git a/source/gs-vertexbuffer.cpp b/source/gs-vertexbuffer.cpp
index 5fd3bcd0..9cb5f096 100644
--- a/source/gs-vertexbuffer.cpp
+++ b/source/gs-vertexbuffer.cpp
@@ -265,6 +265,28 @@ uint32_t GS::VertexBuffer::GetUVLayers() {
 	return m_layers;
 }
 
+vec3* GS::VertexBuffer::GetPositions() {
+	return m_positions;
+}
+
+vec3* GS::VertexBuffer::GetNormals() {
+	return m_normals;
+}
+
+vec3* GS::VertexBuffer::GetTangents() {
+	return m_tangents;
+}
+
+uint32_t* GS::VertexBuffer::GetColors() {
+	return m_colors;
+}
+
+vec4* GS::VertexBuffer::GetUVLayer(size_t idx) {
+	if ((idx < 0) || (idx >= m_layers)) {
+		throw std::out_of_range("idx out of range");
+	}
+	return m_uvs[idx];
+}
 
 gs_vertbuffer_t* GS::VertexBuffer::Update(bool refreshGPU) {
 	if (!refreshGPU)
diff --git a/source/gs-vertexbuffer.h b/source/gs-vertexbuffer.h
index 6cfc6429..39013da1 100644
--- a/source/gs-vertexbuffer.h
+++ b/source/gs-vertexbuffer.h
@@ -114,6 +114,46 @@ namespace GS {
 
 		uint32_t GetUVLayers();
 
+		/*!
+		* \brief Directly access the positions buffer
+		* Returns the internal memory that is assigned to hold all vertex positions.
+		*
+		* \return A <vec3*> that points at the first vertex's position.
+		*/
+		vec3* GetPositions();
+
+		/*!
+		* \brief Directly access the normals buffer
+		* Returns the internal memory that is assigned to hold all vertex normals.
+		*
+		* \return A <vec3*> that points at the first vertex's normal.
+		*/
+		vec3* GetNormals();
+
+		/*!
+		* \brief Directly access the tangents buffer
+		* Returns the internal memory that is assigned to hold all vertex tangents.
+		*
+		* \return A <vec3*> that points at the first vertex's tangent.
+		*/
+		vec3* GetTangents();
+
+		/*!
+		* \brief Directly access the colors buffer
+		* Returns the internal memory that is assigned to hold all vertex colors.
+		*
+		* \return A <uint32_t*> that points at the first vertex's color.
+		*/
+		uint32_t* GetColors();
+
+		/*!
+		* \brief Directly access the uv buffer
+		* Returns the internal memory that is assigned to hold all vertex uvs.
+		*
+		* \return A <vec4*> that points at the first vertex's uv.
+		*/
+		vec4* GetUVLayer(size_t idx);
+
 	#pragma region Update / Grab GS object
 		gs_vertbuffer_t* Update();