Initial commit of all the NXT integration.

More like squashed history, contributors were:
 - Kai Ninomiya
 - Corentin Wallez

src/backend/opengl/PipelineLayoutGL.cpp

@@ -0,0 +1,80 @@
+// Copyright 2017 The NXT Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "PipelineLayoutGL.h"
+
+#include "OpenGLBackend.h"
+
+namespace backend {
+namespace opengl {
+
+    PipelineLayout::PipelineLayout(Device* device, PipelineLayoutBuilder* builder)
+        : PipelineLayoutBase(builder), device(device) {
+        GLuint uboIndex = 0;
+        GLuint samplerIndex = 0;
+        GLuint sampledTextureIndex = 0;
+        GLuint ssboIndex = 0;
+
+        for (size_t group = 0; group < kMaxBindGroups; ++group) {
+            const auto& groupInfo = GetBindGroupLayout(group)->GetBindingInfo();
+
+            for (size_t binding = 0; binding < kMaxBindingsPerGroup; ++binding) {
+                if (!groupInfo.mask[binding]) {
+                    continue;
+                }
+
+                switch (groupInfo.types[binding]) {
+                    case nxt::BindingType::UniformBuffer:
+                        indexInfo[group][binding] = uboIndex;
+                        uboIndex ++;
+                        break;
+                    case nxt::BindingType::Sampler:
+                        indexInfo[group][binding] = samplerIndex;
+                        samplerIndex ++;
+                        break;
+                    case nxt::BindingType::SampledTexture:
+                        indexInfo[group][binding] = sampledTextureIndex;
+                        sampledTextureIndex ++;
+                        break;
+
+                    case nxt::BindingType::StorageBuffer:
+                        indexInfo[group][binding] = ssboIndex;
+                        ssboIndex ++;
+                        break;
+                }
+            }
+        }
+
+        numSamplers = samplerIndex;
+        numSampledTextures = sampledTextureIndex;
+    }
+
+    const PipelineLayout::BindingIndexInfo& PipelineLayout::GetBindingIndexInfo() const {
+        return indexInfo;
+    }
+
+    GLuint PipelineLayout::GetTextureUnitsUsed() const {
+        return 0;
+    }
+
+    size_t PipelineLayout::GetNumSamplers() const {
+        return numSamplers;
+    }
+
+    size_t PipelineLayout::GetNumSampledTextures() const {
+        return numSampledTextures;
+    }
+
+}
+}