Initial commit of all the NXT integration.

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

examples/HelloUBO.cpp

@@ -0,0 +1,116 @@
+// 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 "Utils.h"
+
+#include <unistd.h>
+
+nxt::Device device;
+nxt::Queue queue;
+nxt::Pipeline pipeline;
+nxt::Buffer buffer;
+nxt::BindGroup bindGroup;
+
+struct {uint32_t a; float b;} s;
+
+void init() {
+    nxtProcTable procs;
+    GetProcTableAndDevice(&procs, &device);
+    nxtSetProcs(&procs);
+
+    queue = device.CreateQueueBuilder().GetResult();
+
+    nxt::ShaderModule vsModule = CreateShaderModule(device, nxt::ShaderStage::Vertex, R"(
+        #version 450
+        const vec2 pos[3] = vec2[3](vec2(0.0f, 0.5f), vec2(-0.5f, -0.5f), vec2(0.5f, -0.5f));
+        void main() {
+            gl_Position = vec4(pos[gl_VertexIndex], 0.5, 1.0);
+        })"
+    );
+
+    nxt::ShaderModule fsModule = CreateShaderModule(device, nxt::ShaderStage::Fragment, R"(
+        #version 450
+        layout(set = 0, binding = 0) uniform myBlock {
+            int a;
+            float b;
+        } myUbo;
+        out vec4 fragColor;
+        void main() {
+            fragColor = vec4(1.0, myUbo.a / 255.0, myUbo.b, 1.0);
+        })"
+    );
+
+    nxt::BindGroupLayout bgl = device.CreateBindGroupLayoutBuilder()
+        .SetBindingsType(nxt::ShaderStageBit::Fragment, nxt::BindingType::UniformBuffer, 0, 1)
+        .GetResult();
+
+    nxt::PipelineLayout pl = device.CreatePipelineLayoutBuilder()
+        .SetBindGroupLayout(0, bgl)
+        .GetResult();
+
+    pipeline = device.CreatePipelineBuilder()
+        .SetLayout(pl)
+        .SetStage(nxt::ShaderStage::Vertex, vsModule, "main")
+        .SetStage(nxt::ShaderStage::Fragment, fsModule, "main")
+        .GetResult();
+
+    buffer = device.CreateBufferBuilder()
+        .SetAllowedUsage(nxt::BufferUsageBit::Mapped | nxt::BufferUsageBit::Uniform)
+        .SetInitialUsage(nxt::BufferUsageBit::Mapped)
+        .SetSize(sizeof(s))
+        .GetResult();
+
+    nxt::BufferView view = buffer.CreateBufferViewBuilder()
+        .SetExtent(0, sizeof(s))
+        .GetResult();
+
+    bindGroup = device.CreateBindGroupBuilder()
+        .SetLayout(bgl)
+        .SetUsage(nxt::BindGroupUsage::Frozen)
+        .SetBufferViews(0, 1, &view)
+        .GetResult();
+}
+
+void frame() {
+    s.a = (s.a + 1) % 256;
+    s.b += 0.02;
+    if (s.b >= 1.0f) {s.b = 0.0f;}
+
+    buffer.TransitionUsage(nxt::BufferUsageBit::Mapped);
+    buffer.SetSubData(0, sizeof(s) / sizeof(uint32_t), reinterpret_cast<uint32_t*>(&s));
+
+    nxt::CommandBuffer commands = device.CreateCommandBufferBuilder()
+        .SetPipeline(pipeline)
+        .TransitionBufferUsage(buffer, nxt::BufferUsageBit::Uniform)
+        .SetBindGroup(0, bindGroup)
+        .DrawArrays(3, 1, 0, 0)
+        .GetResult();
+
+    queue.Submit(1, &commands);
+    SwapBuffers();
+}
+
+int main(int argc, const char* argv[]) {
+    if (!InitUtils(argc, argv)) {
+        return 1;
+    }
+    init();
+
+    while (!ShouldQuit()) {
+        frame();
+        usleep(16000);
+    }
+
+    // TODO release stuff
+}