Initial commit of all the NXT integration.

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

examples/HelloCompute.cpp

@@ -0,0 +1,154 @@
+// 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 <string.h>
+#include <unistd.h>
+
+nxt::Device device;
+nxt::Queue queue;
+nxt::Buffer buffer;
+nxt::Pipeline renderPipeline;
+nxt::BindGroup renderBindGroup;
+nxt::Pipeline computePipeline;
+nxt::BindGroup computeBindGroup;
+
+void init() {
+    nxtProcTable procs;
+    GetProcTableAndDevice(&procs, &device);
+    nxtSetProcs(&procs);
+
+    queue = device.CreateQueueBuilder().GetResult();
+
+    struct {uint32_t a; float b;} s;
+    memset(&s, sizeof(s), 0);
+    buffer = device.CreateBufferBuilder()
+        .SetAllowedUsage(nxt::BufferUsageBit::Mapped | nxt::BufferUsageBit::Uniform | nxt::BufferUsageBit::Storage)
+        .SetInitialUsage(nxt::BufferUsageBit::Mapped)
+        .SetSize(sizeof(s))
+        .GetResult();
+    buffer.SetSubData(0, sizeof(s) / sizeof(uint32_t), reinterpret_cast<uint32_t*>(&s));
+
+    nxt::BufferView view = buffer.CreateBufferViewBuilder()
+        .SetExtent(0, sizeof(s))
+        .GetResult();
+
+    {
+        nxt::ShaderModule module = CreateShaderModule(device, nxt::ShaderStage::Compute, R"(
+            #version 450
+            layout(set = 0, binding = 0) buffer myBlock {
+                int a;
+                float b;
+            } myStorage;
+            void main() {
+                myStorage.a = (myStorage.a + 1) % 256;
+                myStorage.b = mod((myStorage.b + 0.02), 1.0);
+            })"
+        );
+
+        nxt::BindGroupLayout bgl = device.CreateBindGroupLayoutBuilder()
+            .SetBindingsType(nxt::ShaderStageBit::Compute, nxt::BindingType::StorageBuffer, 0, 1)
+            .GetResult();
+
+        nxt::PipelineLayout pl = device.CreatePipelineLayoutBuilder()
+            .SetBindGroupLayout(0, bgl)
+            .GetResult();
+
+        computePipeline = device.CreatePipelineBuilder()
+            .SetLayout(pl)
+            .SetStage(nxt::ShaderStage::Compute, module, "main")
+            .GetResult();
+
+        computeBindGroup = device.CreateBindGroupBuilder()
+            .SetLayout(bgl)
+            .SetUsage(nxt::BindGroupUsage::Frozen)
+            .SetBufferViews(0, 1, &view)
+            .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();
+
+        renderPipeline = device.CreatePipelineBuilder()
+            .SetLayout(pl)
+            .SetStage(nxt::ShaderStage::Vertex, vsModule, "main")
+            .SetStage(nxt::ShaderStage::Fragment, fsModule, "main")
+            .GetResult();
+
+        renderBindGroup = device.CreateBindGroupBuilder()
+            .SetLayout(bgl)
+            .SetUsage(nxt::BindGroupUsage::Frozen)
+            .SetBufferViews(0, 1, &view)
+            .GetResult();
+    }
+}
+
+void frame() {
+    nxt::CommandBuffer commands = device.CreateCommandBufferBuilder()
+        .SetPipeline(computePipeline)
+        .TransitionBufferUsage(buffer, nxt::BufferUsageBit::Storage)
+        .SetBindGroup(0, computeBindGroup)
+        .Dispatch(1, 1, 1)
+
+        .SetPipeline(renderPipeline)
+        .TransitionBufferUsage(buffer, nxt::BufferUsageBit::Uniform)
+        .SetBindGroup(0, renderBindGroup)
+        .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
+}