Removed some of the C'ness, moving stuff into the kernel
This commit is contained in:
279
Conway_OpenCL/Conway.cpp
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279
Conway_OpenCL/Conway.cpp
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#include <CL/cl.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <iostream>
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#include <string>
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#include <fstream>
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#include <random>
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#include <ctime>
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#include <SFML/Graphics.hpp>
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#include <windows.h>
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#define SUCCESS 0
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#define FAILURE 1
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float elap_time() {
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static __int64 start = 0;
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static __int64 frequency = 0;
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if (start == 0) {
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QueryPerformanceCounter((LARGE_INTEGER*)&start);
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QueryPerformanceFrequency((LARGE_INTEGER*)&frequency);
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return 0.0f;
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}
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__int64 counter = 0;
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QueryPerformanceCounter((LARGE_INTEGER*)&counter);
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return (float)((counter - start) / double(frequency));
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}
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/* convert the kernel file into a string */
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int convertToString(const char *filename, std::string& s)
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{
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size_t size;
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char* str;
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std::fstream f(filename, (std::fstream::in | std::fstream::binary));
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if(f.is_open())
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{
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size_t fileSize;
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f.seekg(0, std::fstream::end);
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size = fileSize = (size_t)f.tellg();
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f.seekg(0, std::fstream::beg);
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str = new char[size+1];
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if(!str)
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{
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f.close();
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return 0;
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}
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f.read(str, fileSize);
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f.close();
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str[size] = '\0';
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s = str;
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delete[] str;
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return 0;
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}
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std::cout << "Error: failed to open file\n:" << filename << std::endl;
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return FAILURE;
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}
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int main(int argc, char* argv[])
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{
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int WINDOW_X = 1000;
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int WINDOW_Y = 1000;
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int GRID_WIDTH = 1000;
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int GRID_HEIGHT = 1000;
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int WORKER_SIZE = 2000;
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// ============================== OpenCL Setup ==================================================================
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// Get the platforms
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cl_uint numPlatforms;
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cl_platform_id platform = NULL;
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cl_int status = clGetPlatformIDs(0, NULL, &numPlatforms); // Retrieve the number of platforms
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if (status != CL_SUCCESS) {
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std::cout << "Error: Getting platforms!" << std::endl;
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return FAILURE;
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}
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// Choose the first available platform
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if(numPlatforms > 0) {
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cl_platform_id* platforms = new cl_platform_id[numPlatforms];
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status = clGetPlatformIDs(numPlatforms, platforms, NULL); // Now populate the array with the platforms
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platform = platforms[0];
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delete platforms;
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}
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cl_uint numDevices = 0;
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cl_device_id *devices;
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status = clGetDeviceIDs(platform, CL_DEVICE_TYPE_GPU, 0, NULL, &numDevices);
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if (numDevices == 0) { //no GPU available.
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std::cout << "No GPU device available." << std::endl;
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std::cout << "Choose CPU as default device." << std::endl;
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status = clGetDeviceIDs(platform, CL_DEVICE_TYPE_CPU, 0, NULL, &numDevices);
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devices = new cl_device_id[numDevices];
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status = clGetDeviceIDs(platform, CL_DEVICE_TYPE_CPU, numDevices, devices, NULL);
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}
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else {
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devices = new cl_device_id[numDevices];
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status = clGetDeviceIDs(platform, CL_DEVICE_TYPE_GPU, numDevices, devices, NULL);
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}
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cl_context context = clCreateContext(NULL,1, devices,NULL,NULL,NULL);
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cl_command_queue commandQueue = clCreateCommandQueue(context, devices[0], 0, NULL);
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// ============================== Kernel Compilation, Setup ====================================================
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// Read the kernel from the file to a string
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const char *filename = "conway_kernel.cl";
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std::string sourceStr;
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status = convertToString(filename, sourceStr);
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// Create a program with the source
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const char *source = sourceStr.c_str();
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size_t sourceSize[] = {strlen(source)};
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cl_program program = clCreateProgramWithSource(context, 1, &source, sourceSize, NULL);
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// Build the program
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status = clBuildProgram(program, 1,devices,NULL,NULL,NULL);
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// If the build failed
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if (status == CL_BUILD_PROGRAM_FAILURE) {
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// Determine the size of the log
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size_t log_size;
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clGetProgramBuildInfo(program, devices[0], CL_PROGRAM_BUILD_LOG, 0, NULL, &log_size);
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// Allocate memory for the log
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char *log = new char[log_size];
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// Get the log
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clGetProgramBuildInfo(program, devices[0], CL_PROGRAM_BUILD_LOG, log_size, log, NULL);
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// Print the log
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std::cout << log << std::endl;
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}
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// Now create the kernel
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cl_kernel kernel = clCreateKernel(program, "conway", NULL);
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// ======================================= Setup grid =========================================================
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// Setup the rng
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std::mt19937 rng(time(NULL));
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std::uniform_int_distribution<int> rgen(0, 12); // 25% chance
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// Init the grids
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unsigned char* front_grid = new unsigned char[GRID_WIDTH * GRID_HEIGHT* 2];
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for (int i = 0; i < 1000 * 1000; i += 2) {
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if (rgen(rng) == 1) {
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front_grid[i] = 1;
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}
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else {
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front_grid[i] = 0;
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}
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}
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unsigned char* rear_grid = new unsigned char[GRID_WIDTH * GRID_HEIGHT * 2];
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for (int i = 0; i < GRID_WIDTH * GRID_HEIGHT; i++) {
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rear_grid[i] = front_grid[i];
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}
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// ====================================== Setup SFML ==========================================================
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sf::Uint8* asdf = rear_grid;
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sf::Uint8* pixel_array = new sf::Uint8[WINDOW_X * WINDOW_Y * 4];
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for (int i = 0; i < GRID_WIDTH * GRID_HEIGHT * 2; i += 2) {
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int p = i / 2;
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pixel_array[p * 4] = 49; // R?
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pixel_array[p * 4 + 1] = 68; // G?
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pixel_array[p * 4 + 2] = 72; // B?
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pixel_array[p * 4 + 3] = 255; // A?
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}
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char* arr = new char[1000 * 1000];
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// Init window, and loop data
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sf::RenderWindow window(sf::VideoMode(GRID_WIDTH, GRID_HEIGHT), "Classic Games");
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float step_size = 0.0005f;
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double frame_time = 0.0, elapsed_time = 0.0, delta_time = 0.0, accumulator_time = 0.0, current_time = 0.0;
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int frame_count = 0;
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int err = 0;
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cl_mem frontBuffer = clCreateBuffer(context, CL_MEM_READ_WRITE | CL_MEM_COPY_HOST_PTR, GRID_WIDTH * GRID_HEIGHT * sizeof(char), (void*)front_grid, &err);
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cl_mem rearBuffer = clCreateBuffer(context, CL_MEM_READ_WRITE | CL_MEM_COPY_HOST_PTR, GRID_WIDTH * GRID_HEIGHT * sizeof(char), (void*)rear_grid, &err);
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cl_mem workerCountBuffer = clCreateBuffer(context, CL_MEM_READ_ONLY | CL_MEM_COPY_HOST_PTR, sizeof(int), &WORKER_SIZE, &err);
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cl_mem gridWidthBuffer = clCreateBuffer(context, CL_MEM_READ_ONLY | CL_MEM_COPY_HOST_PTR, sizeof(int), &GRID_WIDTH, &err);
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cl_mem gridHeightBuffer = clCreateBuffer(context, CL_MEM_READ_ONLY | CL_MEM_COPY_HOST_PTR, sizeof(int), &GRID_HEIGHT, &err);
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status = clSetKernelArg(kernel, 0, sizeof(cl_mem), (void *)&frontBuffer);
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status = clSetKernelArg(kernel, 1, sizeof(cl_mem), (void *)&workerCountBuffer);
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status = clSetKernelArg(kernel, 2, sizeof(cl_mem), (void *)&gridWidthBuffer);
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status = clSetKernelArg(kernel, 3, sizeof(cl_mem), (void *)&gridHeightBuffer);
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sf::Texture texture;
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texture.create(WINDOW_X, WINDOW_Y);
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sf::Sprite sprite(texture);
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// ===================================== Loop ==================================================================
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while (window.isOpen()) {
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sf::Event event;
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while (window.pollEvent(event)) {
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if (event.type == sf::Event::Closed)
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window.close();
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}
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// Time keeping
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//elapsed_time = elap_time();
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delta_time = elapsed_time - current_time;
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current_time = elapsed_time;
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if (delta_time > 0.02f)
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delta_time = 0.02f;
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accumulator_time += delta_time;
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while ((accumulator_time - step_size) >= step_size) {
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accumulator_time -= step_size;
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// Do nothing, FPS tied update()
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}
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// ======================================= OpenCL Shtuff =============================================
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// Update the data in GPU memory
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//status = clEnqueueWriteBuffer(commandQueue, frontBuffer, CL_TRUE, 0, GRID_WIDTH * GRID_HEIGHT * 2 * sizeof(char), (void*)grid, NULL, 0, NULL);
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// Work size, for each y line
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size_t global_work_size[1] = { WORKER_SIZE };
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// Run the kernel
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status = clEnqueueNDRangeKernel(commandQueue, kernel, 1, NULL, global_work_size, NULL, 0, NULL, NULL);
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// Get output, put back into grid
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status = clEnqueueReadBuffer(commandQueue, frontBuffer, CL_TRUE, 0, GRID_WIDTH * GRID_HEIGHT * sizeof(char), (void*)rear_grid, 0, NULL, NULL);
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texture.update(pixel_array);
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window.draw(sprite);
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frame_count++;
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window.display();
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}
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// Temporary
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status = clReleaseMemObject(frontBuffer);
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status = clReleaseMemObject(workerCountBuffer);
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status = clReleaseMemObject(gridWidthBuffer);
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status = clReleaseMemObject(gridHeightBuffer);
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/*Step 12: Clean the resources.*/
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status = clReleaseKernel(kernel); //Release kernel.
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status = clReleaseProgram(program); //Release the program object.
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status = clReleaseCommandQueue(commandQueue); //Release Command queue.
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status = clReleaseContext(context); //Release context.
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if (devices != NULL)
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{
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free(devices);
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devices = NULL;
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}
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return SUCCESS;
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}
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