From f09133f413624c0ee192a3943ef460d764acb711 Mon Sep 17 00:00:00 2001
From: Sam Gateau <sam@highfidelity.io>
Date: Thu, 16 Oct 2014 17:23:31 -0700
Subject: [PATCH] Adding the Batch class to GPU

---
 interface/src/gpu/Batch.cpp | 65 +++++++++++++++++++++++++
 interface/src/gpu/Batch.h   | 94 +++++++++++++++++++++++++++++++++++++
 2 files changed, 159 insertions(+)
 create mode 100644 interface/src/gpu/Batch.cpp
 create mode 100644 interface/src/gpu/Batch.h

diff --git a/interface/src/gpu/Batch.cpp b/interface/src/gpu/Batch.cpp
new file mode 100644
index 0000000000..a364a678fc
--- /dev/null
+++ b/interface/src/gpu/Batch.cpp
@@ -0,0 +1,65 @@
+//
+//  Batch.cpp
+//  interface/src/gpu
+//
+//  Created by Sam Gateau on 10/14/2014.
+//  Copyright 2014 High Fidelity, Inc.
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+//
+#include "Batch.h"
+
+#include <QDebug>
+
+using namespace gpu;
+
+Batch::Batch() :
+    _commands(),
+    _params(),
+    _resources(){
+}
+
+Batch::~Batch() {
+}
+
+void Batch::clear() {
+    _commands.clear();
+    _params.clear();
+    _resources.clear();
+}
+
+void Batch::draw( Primitive primitiveType, int nbVertices, int startVertex) {
+    _commands.push(COMMAND_DRAW);
+    _params.push(startVertex);
+    _params.push(nbVertices);
+    _params.push(primitiveType);
+}
+
+void Batch::drawIndexed( Primitive primitiveType, int nbIndices, int startIndex) {
+    _commands.push(COMMAND_DRAW_INDEXED);
+    _params.push(startIndex);
+    _params.push(nbIndices);
+    _params.push(primitiveType);
+}
+
+void Batch::drawInstanced( uint32 nbInstances, Primitive primitiveType, int nbVertices, int startVertex, int startInstance) {
+    _commands.push(COMMAND_DRAW_INSTANCED);
+    _params.push(startInstance);
+    _params.push(startVertex);
+    _params.push(nbVertices);
+    _params.push(primitiveType);
+    _params.push(nbInstances);
+}
+
+void Batch::drawIndexedInstanced( uint32 nbInstances, Primitive primitiveType, int nbIndices, int startIndex, int startInstance) {
+    _commands.push(COMMAND_DRAW_INDEXED_INSTANCED);
+    _params.push(startInstance);
+    _params.push(startIndex);
+    _params.push(nbIndices);
+    _params.push(primitiveType);
+    _params.push(nbInstances);
+}
+
+
+
diff --git a/interface/src/gpu/Batch.h b/interface/src/gpu/Batch.h
new file mode 100644
index 0000000000..43888e517b
--- /dev/null
+++ b/interface/src/gpu/Batch.h
@@ -0,0 +1,94 @@
+//
+//  Batch.h
+//  interface/src/gpu
+//
+//  Created by Sam Gateau on 10/14/2014.
+//  Copyright 2014 High Fidelity, Inc.
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+//
+#ifndef hifi_gpu_Batch_h
+#define hifi_gpu_Batch_h
+
+#include <assert.h>
+#include "InterfaceConfig.h"
+
+namespace gpu {
+
+class Buffer;
+typedef int  Stamp;
+
+// TODO: move the backend namespace into dedicated files, for now we keep it close to the gpu objects definition for convenience
+namespace backend {
+
+};
+
+enum Primitive {
+    PRIMITIVE_POINTS = 0,
+    PRIMITIVE_LINES,
+    PRIMITIVE_LINE_STRIP,
+    PRIMITIVE_TRIANGLES,
+    PRIMITIVE_TRIANGLE_STRIP,
+    PRIMITIVE_QUADS,
+};
+
+class Batch {
+public:
+
+    Batch();
+    Batch(const Batch& batch);
+    ~Batch();
+
+    void clear();
+
+    void draw( Primitive primitiveType, int nbVertices, int startVertex = 0);
+    void drawIndexed( Primitive primitiveType, int nbIndices, int startIndex = 0 );
+    void drawInstanced( uint32 nbInstances, Primitive primitiveType, int nbVertices, int startVertex = 0, int startInstance = 0);
+    void drawIndexedInstanced( uint32 nbInstances, Primitive primitiveType, int nbIndices, int startIndex = 0, int startInstance = 0);
+
+    void glBindBuffer( GLenum
+protected:
+
+    enum Command {
+        COMMAND_DRAW = 0,
+        COMMAND_DRAW_INDEXED,
+        COMMAND_DRAW_INSTANCED,
+        COMMAND_DRAW_INDEXED_INSTANCED,
+        
+        COMMAND_SET_PIPE_STATE,
+        COMMAND_SET_VIEWPORT,
+        COMMAND_SET_FRAMEBUFFER,
+        COMMAND_SET_RESOURCE,
+        COMMAND_SET_VERTEX_STREAM,
+        COMMAND_SET_INDEX_STREAM,
+
+        COMMAND_GL_SET_UNIFORM,
+
+    };
+    typedef std::vector<Command> Commands;
+
+    class Param {
+    public:
+        union {
+            uint32 _uint;
+            char _chars[4];
+        };
+        Param( uint32 val ): _uint(val) {}
+    };
+    typedef std::vector<Param> Params;
+
+    class ResourceCache {
+    public:
+        Resource* _resource;
+    };
+    typedef std::vector<ResourceCache> Resources;
+
+    Commands _commands;
+    Params _params;
+    Resources _resources;
+};
+
+};
+
+#endif