Added spirv-cross.

3rdparty/spirv-cross/samples/cpp/shared.cpp

@@ -0,0 +1,89 @@
+/*
+ * Copyright 2015-2017 ARM Limited
+ *
+ * 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 "spirv_cross/external_interface.h"
+#include <stdio.h>
+
+#ifndef GLM_SWIZZLE
+#define GLM_SWIZZLE
+#endif
+
+#ifndef GLM_FORCE_RADIANS
+#define GLM_FORCE_RADIANS
+#endif
+
+#include <glm/glm.hpp>
+using namespace glm;
+
+int main()
+{
+	// First, we get the C interface to the shader.
+	// This can be loaded from a dynamic library, or as here,
+	// linked in as a static library.
+	auto *iface = spirv_cross_get_interface();
+
+	// Create an instance of the shader interface.
+	auto *shader = iface->construct();
+
+// Build some input data for our compute shader.
+#define NUM_WORKGROUPS 4
+	float a[128 * NUM_WORKGROUPS];
+	float b[NUM_WORKGROUPS] = {};
+
+	for (int i = 0; i < 128 * NUM_WORKGROUPS; i++)
+	{
+		a[i] = float(i);
+	}
+
+	void *aptr = a;
+	void *bptr = b;
+
+	// Bind resources to the shader.
+	// For resources like samplers and buffers, we provide a list of pointers,
+	// since UBOs, SSBOs and samplers can be arrays, and can point to different types,
+	// which is especially true for samplers.
+	spirv_cross_set_resource(shader, 0, 0, &aptr, sizeof(aptr));
+	spirv_cross_set_resource(shader, 0, 1, &bptr, sizeof(bptr));
+
+	// We also have to set builtins.
+	// The relevant builtins will depend on the shader,
+	// but for compute, there are few builtins, which are gl_NumWorkGroups and gl_WorkGroupID.
+	// LocalInvocationID and GlobalInvocationID are inferred when executing the invocation.
+	uvec3 num_workgroups(NUM_WORKGROUPS, 1, 1);
+	uvec3 work_group_id(0, 0, 0);
+	spirv_cross_set_builtin(shader, SPIRV_CROSS_BUILTIN_NUM_WORK_GROUPS, &num_workgroups, sizeof(num_workgroups));
+	spirv_cross_set_builtin(shader, SPIRV_CROSS_BUILTIN_WORK_GROUP_ID, &work_group_id, sizeof(work_group_id));
+
+	// Execute 4 work groups.
+	for (unsigned i = 0; i < NUM_WORKGROUPS; i++)
+	{
+		work_group_id.x = i;
+		iface->invoke(shader);
+	}
+
+	// Call destructor.
+	iface->destruct(shader);
+
+	// Verify our output.
+	// TODO: Implement a test framework that asserts results computed.
+	for (unsigned i = 0; i < NUM_WORKGROUPS; i++)
+	{
+		float expected_sum = 0.0f;
+		for (unsigned j = i * 128; j < (i + 1) * 128; j++)
+			expected_sum += a[j];
+		fprintf(stderr, "Sum in workgroup #%u = %.1f, expected %.1f\n", i, b[i], expected_sum);
+	}
+}