Add renderpass abstraction

libraries/gpu/src/gpu/Renderpass.cpp

@@ -0,0 +1,38 @@
+//
+//  Created by Bradley Austin Davis on 2018/10/21
+//  Copyright 2013-2018 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 "Renderpass.h"
+
+using namespace gpu;
+
+Attachment::Attachment() {
+}
+
+Attachment::Attachment(const Element& element, LoadOp load, StoreOp store, LoadOp stencilLoad, StoreOp stencilStore) :
+    loadOp(load), storeOp(store), stencilLoadOp(stencilLoad), stencilStoreOp(stencilStore) {
+}
+
+uint32_t Attachment::getRaw() const {
+    throw std::runtime_error("not implemented");
+}
+
+void Attachment::setRaw(uint32_t raw) {
+    throw std::runtime_error("not implemented");
+}
+
+void Renderpass::addColorAttachment(const Element& element, LoadOp load, StoreOp store) {
+    _colorAttachments.emplace_back(element, load, store);
+}
+
+void Renderpass::setDepthStencilAttachment(const Element& element,
+                                           LoadOp load,
+                                           StoreOp store,
+                                           LoadOp stencilLoad,
+                                           StoreOp stencilStore) {
+    _depthStencilAttachment = Attachment{ element, load, store, stencilLoad, stencilStore };
+}

libraries/gpu/src/gpu/Renderpass.h

@@ -0,0 +1,66 @@
+//
+//  Created by Bradley Austin Davis on 2018/10/21
+//  Copyright 2013-2018 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
+//
+#pragma once
+#ifndef hifi_gpu_Renderpass_h
+#define hifi_gpu_Renderpass_h
+
+#include <assert.h>
+#include <memory>
+#include <functional>
+#include <vector>
+#include <string>
+
+#include "Format.h"
+
+namespace gpu {
+
+enum class LoadOp
+{
+    Load = 0,
+    Clear = 1,
+    DontCare = 2,
+};
+
+enum class StoreOp
+{
+    Store = 0,
+    DontCare = 1,
+};
+
+struct Attachment {
+    Attachment();
+    Attachment(const Element& element, LoadOp loadOp, StoreOp storeOp, LoadOp stencilLoadOp = LoadOp::DontCare, StoreOp stencilStoreOp = StoreOp::DontCare);
+    Element element;
+    LoadOp loadOp{ LoadOp::DontCare };
+    StoreOp storeOp{ StoreOp::DontCare };
+    LoadOp stencilLoadOp{ LoadOp::DontCare };
+    StoreOp stencilStoreOp{ StoreOp::DontCare };
+
+    uint32_t getRaw() const;
+    void setRaw(uint32_t raw);
+};
+
+class Renderpass {
+public:
+    using Attachments = std::vector<Attachment>;
+
+    Renderpass();
+    virtual ~Renderpass();
+
+    void addColorAttachment(const Element& element, LoadOp load, StoreOp store);
+    void setDepthStencilAttachment(const Element& element, LoadOp load, StoreOp store, LoadOp stencilLoadOp = LoadOp::DontCare, StoreOp stencilStoreOp = StoreOp::DontCare);
+
+protected:
+    Attachments _colorAttachments;
+    Attachment _depthStencilAttachment;
+    // TODO if we want to start working with input attachments and multisampling resolve attachments, we'll need to extend this class 
+};
+
+}  // namespace gpu
+
+#endif