SPIRV-Cross/samples/cpp/multiply.cpp

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/*
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* Copyright 2015-2017 ARM Limited
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*
* 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();
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// Build some input data for our compute shader.
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#define NUM_WORKGROUPS 4
vec4 a[64 * NUM_WORKGROUPS];
vec4 b[64 * NUM_WORKGROUPS];
vec4 c[64 * NUM_WORKGROUPS] = {};
for (int i = 0; i < 64 * NUM_WORKGROUPS; i++)
{
a[i] = vec4(100 + i, 101 + i, 102 + i, 103 + i);
b[i] = vec4(100 - i, 99 - i, 98 - i, 97 - i);
}
void *aptr = a;
void *bptr = b;
void *cptr = c;
// 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));
spirv_cross_set_resource(shader, 0, 2, &cptr, sizeof(cptr));
// 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 < 64 * NUM_WORKGROUPS; i++)
{
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fprintf(stderr, "(%.1f, %.1f, %.1f, %.1f) * (%.1f, %.1f, %.1f, %.1f) => (%.1f, %.1f, %.1f, %.1f)\n", a[i].x,
a[i].y, a[i].z, a[i].w, b[i].x, b[i].y, b[i].z, b[i].w, c[i].x, c[i].y, c[i].z, c[i].w);
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}
}